TECHNICAL FIELD
[0001] Embodiments of the present invention relate to a hot water generator.
BACKGROUND
[0002] For example, a hot water generator of heat pump type includes: a water heat exchanger
for heat exchange between a refrigerant and water; and a circulation pump for sending
the hot water after the heat exchange to a hot water supply destination or a hot water
storage device. Regarding such a generator, a known pump support base is configured
to be fixed on a bottom plate of a housing and support the circulation pump.
[0003] The pump support base includes a bottom wall plate and right and left standing wall
plates that are provided on both sides of the bottom wall plate. The right and left
standing wall plates sandwich a motor housing of the circulation pump. The upper end
of one of the standing wall plates is in contact with a convex portion of the motor
housing. A pump fixture is attached to the other standing wall plate. The pump fixture
is caught in part of the motor housing so as to prevent the circulation pump from
moving in the axial direction and cooperates with one of the standing wall plates
so as to prevent the circulation pump from rotating in the circumferential direction.
PRIOR ART Document
PATENT DOCUMENT
SUMMARY
PROBLEMS TO BE SOLVED BY INVENTION
[0005] Piping for circulating water or hot water is connected to the circulation pump. This
piping is connected to the circulation pump via, for example, a screw-in pipe joint.
[0006] Depending on the arrangement of the circulation pump in the housing, in some cases,
the hot water generator includes: a circulation pump; and a relay pipe that relays
the circulation pump and a crossover pipe extending to a hot water supply place for
supplying hot water. In such a case, the hot water generator requires: a screw-in
first pipe joint that connects the circulation pump and the relay pipe; and a screw-in
second pipe joint that connects the relay pipe and the crossover pipe.
[0007] At the time of connecting the crossover pipe to the second pipe joint, there is a
possibility that the force for fastening the crossover pipe to the second pipe joint
acts on the connection portion between the relay pipe and the second pipe joint, acts
on the connection portion between the first pipe joint and the relay pipe via the
relay pipe, or acts on the connection portion between the pump and the first pipe
joint via the relay pipe, resulting in loosening the respective connection portions
and inducing water leakage due to this loosening.
[0008] An object of the present invention is to provide a hot water generator where a crossover
pipe extending to a hot water supply place for supplying hot-water can be connected
without loosening a screw-in pipe joint of a circulation pump.
MEANS FOR SOLVING PROBLEM
[0009] A hot water generator according to one aspect of the invention includes a housing
that has a joint insertion hole, a pump that includes an screw-in inlet-side pipe
joint disposed inside the housing, and an screw-in outlet-side pipe joint, and a connection
joint that is fixed to the outlet-side pipe joint and protrudes to the outside of
the housing through the joint insertion hole, and is connectable to a crossover pipe
outside the housing, which sends hot water to a hot water supply place.
[0010] According to another aspect of the invention, the connection joint of the hot water
generator has a non-circular outer shape when viewed in a direction of being connected
to the outlet-side pipe joint, and the housing includes a loosening prevention unit
that is provided at an opening edge of the joint insertion hole to prevent the connection
joint from loosening.
[0011] According to still further aspect of the invention, the connection joint of the hot
water generator has a hexagonal outer shape when viewed in a direction of being connected
to the outlet-side pipe joint. The hot water generator further includes an anti-loosening
member that is fixed to an outside of the housing, and intervenes between the housing
and the connection joint to prevent the connection joint from loosening, and a plurality
of fastening members that fix the anti-loosening member to the housing. The housing
has a plurality of first fixing holes annularly arranged around the joint insertion
hole, while the anti-loosening member has a hexagonal fitting hole into which the
connection joint can be fitted, and a plurality of second fixing holes annularly arranged
around the fitting hole and having an elongated hole shape along a circle which the
arrangement of the second fixing holes forms. The plurality of fastening members are
configured to fasten the first fixing holes and the second fixing holes together,
number of the first fixing holes is larger than number of the second fixing holes,
the number of the first fixing holes and the number of the second fixing holes are
continuous even numbers or continuous multiples of 3, an opening range of the plurality
of second fixing holes in a direction along the circle is larger than an angle range
obtained by subtracting a first angle from a second angle, the first angle being obtained
by dividing 360° by the number of the first fixing holes, the second angle being obtained
by dividing 360° by the number of the second fixing holes.
EFFECTS OF INVENTION
[0012] The present invention can provide a hot water generator where a crossover pipe extending
to a hot water supply place for supplying hot water can be connected without loosening
a screw-in pipe joint of a circulation pump.
BRIEF DESCRIPTION OF DRAWINGS
[0013]
Fig. 1 is a system configuration diagram of a hot water generator according to one
embodiment of the present invention.
Fig. 2 is a perspective view of a water heat exchange unit of the hot water generator
according to the present embodiment.
Fig. 3 is an exploded perspective view of the water heat exchange unit of the hot
water generator according to the present embodiment.
Fig. 4 is a perspective view of the internal structure of the hot water generator
according to the present embodiment.
Fig. 5 is a front view of the internal structure of the hot water generator according
to the present embodiment.
Fig. 6 is a front view of an anti-loosening structure of a pipe connection joint of
the hot water generator according to the present embodiment.
Fig. 7 is a perspective view of the anti-loosening structure of the pipe connection
joint of the hot water generator according to the present embodiment.
Fig. 8 is a perspective view of another example of the anti-loosening structure of
the pipe connection joint of the hot water generator according to the present embodiment.
Fig. 9A to Fig. 9G are bottom views of another example of the anti-loosening structure
of the pipe connection joint of the hot water generator according to the present embodiment.
Fig. 10 is a perspective view of another fixing structure of the pipe connection joint
of the hot water generator according to the present embodiment.
Fig. 11 is an exploded perspective view of another fixing structure of the pipe connection
joint of the hot water generator according to the present embodiment.
DETAILED DESCRIPTION
[0014] Embodiments of a hot water generator according to the present invention will be described
by referring to Fig. 1 to Fig. 11. The same reference signs are given to identical
or equivalent components in each figure.
[0015] Fig. 1 is a system configuration diagram of a hot water generator 1 according to
one embodiment of the present invention.
[0016] As shown in Fig. 1, the hot water generator 1 according to the present embodiment
is a heat pump type. The hot water generator 1 includes: an outdoor unit 2 that is
a heat source unit configured to exchange heat between outdoor air and a refrigerant;
a hydro unit 3 (i.e., water heat exchange unit) that exchanges heat between the refrigerant
and water supplied from the outside of the generator; a remote controller 4 that accepts
operations by a user as an input device; and a controller 5 that controls the outdoor
unit 2 and the hydro unit 3 on the basis of the operations inputted to the remote
controller 4.
[0017] The hot water generator 1 circulates the refrigerant between the outdoor unit 2 and
the hydro unit 3, and heats water by exchanging heat between the refrigerant and water
in a water heat exchanger 15 in the hydro unit 3 so as to supply hot water at the
first temperature (for example, 40 degrees Celsius) to the outside of the generator.
The hot water at the first temperature is returned to the hydro unit 3 through an
external heating device (not shown) such as a floor heating system. In other words,
water circulates between the hydro unit 3 and the external heat radiating device such
as a heat radiator of the heating device.
[0018] In addition, the hot water generator 1 can supply high-temperature hot water at the
second temperature (for example, about 70 degrees Celsius) to the outside of the generator
by applying heat exchange between the refrigerant and water as well as heating with
the use of a backup heater 67 described below. When only the heat exchange between
the refrigerant and water is applied, though it depends on the type of refrigerant
to be used, the maximum temperature is about 55 degrees Celsius in the case of using
the R410A refrigerant. The hot water at the second temperature is stored in a hot
water storage device outside the generator and then is used. The hot water stored
in the hot water storage device is supplied to, for example, a washroom, a kitchen,
and a bathroom. Normally, the outdoor unit 2 is installed outdoors and the hydro unit
3 is installed indoors. The outdoor unit 2 and the hydro unit 3 are interconnected
by refrigerant pipes 21 and 22 and a communication line (not shown). In the hot water
generator 1 as described above, the water pipe is not laid outdoors, and thus, freezing
of water in the water pipe does not occur at low temperature in winter.
[0019] The number of the included remote controller(s) 4 is one or more. For example, one
remote controller 4 is installed in the hydro unit 3 and another remote controller
(not shown) is installed indoors (e.g., on a wall surface).
[0020] The hot water generator 1 includes a refrigeration circuit 10. The refrigeration
circuit 10 transfers heat from a low temperature portion to a high temperature portion
by using outdoor air as a heat source so as to heat water into hot water.
[0021] The refrigeration circuit 10 includes: a compressor 11; an air heat exchanger 12
as an evaporator; an expansion valve 13; the water heat exchanger 15 as a condenser;
and refrigerant piping 16 that connects the compressor 11, the air heat exchanger
12, the expansion valve 13, and the water heat exchanger 15 so as to circulate the
refrigerant. The refrigeration circuit 10 transfers heat from the air heat exchanger
12 to the water heat exchanger 15 so as to heat the water into hot water in the water
heat exchanger 15.
[0022] The refrigeration circuit 10 further includes: a four-way valve 17 that sends the
refrigerant having discharged from the compressor 11 to one of the air heat exchanger
12 and the water heat exchanger 15 and returns the refrigerant having passed through
the other of the air heat exchanger 12 and the water heat exchanger 15 back to the
compressor 11; and an accumulator 18 disposed in the refrigerant piping 16 between
the four-way valve 17 and the compressor 11.
[0023] The water heat exchanger 15 is housed in the hydro unit 3, and the rest of the other
components of the refrigeration circuit 10 are housed in the outdoor unit 2.
[0024] When the refrigeration circuit 10 heats water, the air heat exchanger 12 functions
as an evaporator (also called a heat absorber) and the water heat exchanger 15 functions
as a condenser (also called a radiator).
[0025] The compressor 11 compresses, boosts, and discharges the refrigerant. The compressor
11 can change the operating frequency by known inverter control. The amount of heat
to be transferred to the high temperature portion increases by increasing the rotation
speed of the compressor 11 and decreases by decreasing the rotation speed of the compressor
11. In addition, the power consumption of the compressor 11 increases along with the
increase in the rotation speed of the compressor 11.
[0026] The expansion valve 13 is, for example, an electronic expansion valve (PMV: Pulse
Motor Valve). The expansion valve 13 can adjust the valve opening degree. Although
it is not shown, the expansion valve 13 includes: a valve body having a through hole;
a needle that can advance and retreat with respect to the through hole; and a power
source for advancing and retreating the needle, for example. When the through hole
is closed with the needle, the expansion valve 13 stops, i.e., blocks the flow of
the refrigerant in the refrigeration circuit 10. At this time, the expansion valve
13 is in the closed state and the opening degree of the expansion valve 13 is the
smallest. When the needle is farthest from the through hole, the flow rate of the
refrigerant in the refrigeration circuit 10 is maximized and the opening degree of
the expansion valve 13 is the largest.
[0027] The power source of the expansion valve 13 is, for example, a stepping motor. The
rotation of the stepping motor causes the needle to move forward and backward, which
changes the distance to the through hole and thereby changes the opening degree.
[0028] The refrigerant piping 16 connects the compressor 11, the accumulator 18, the four-way
valve 17, the air heat exchanger 12, the expansion valve 13, and the water heat exchanger
15. The refrigerant piping 16 includes: a first refrigerant pipe 16a that connects
the discharge side of the compressor 11 and the four-way valve 17; a second refrigerant
pipe 16b that connects the suction side of the compressor 11 and the four-way valve
17; a third refrigerant pipe 16c that connects the four-way valve 17 and the water
heat exchanger 15; a fourth refrigerant pipe 16d that connects the air heat exchanger
12 and the water heat exchanger 15; and a fifth refrigerant pipe 16e that connects
the air heat exchanger 12 and the four-way valve 17.
[0029] The accumulator 18 is provided on the second refrigerant pipe 16b. The expansion
valve 13 is provided on the fourth refrigerant pipe 16d.
[0030] The four-way valve 17 switches the direction of the refrigerant flow in the refrigerant
piping 16. When the water is heated into hot water by the refrigeration circuit 10,
the four-way valve 17 circulates the refrigerant from the first refrigerant pipe 16a
to the third refrigerant pipe 16c and circulates the refrigerant from the fifth refrigerant
pipe 16e to the second refrigerant pipe 16b (refrigerant flow shown by the solid line
in Fig. 1).
[0031] When water is heated into hot water, the hot water generator 1 discharges the compressed
high-temperature and high-pressure refrigerant from the compressor 11 and then sends
the refrigerant to the water heat exchanger 15 via the four-way valve 17. The water
heat exchanger 15 exchanges heat between the water passing through the water heat
exchanger 15 and the refrigerant passing through the water heat exchanger 15. In this
manner, the water is heated and the refrigerant is cooled so as to be in a high-pressure
liquid state. That is, when water is heated into hot water, the water heat exchanger
15 functions as a radiator. The refrigerant having passed through the water heat exchanger
15 passes through the expansion valve 13 and is decompressed to become a low-pressure
gas-liquid two-phase refrigerant, and then reaches the air heat exchanger 12. The
air heat exchanger 12 cools the outdoor air by exchanging heat between the outdoor
air and the refrigerant passing through the air heat exchanger 12. At this time, the
air heat exchanger 12 functions as a heat absorber that evaporates the refrigerant
into a gaseous state. The refrigerant having passed through the air heat exchanger
12 is sucked into the compressor 11.
[0032] The refrigeration circuit 10 can perform defrosting operation by causing the four-way
valve 17 to switch the direction of the refrigerant flow in the refrigerant piping
16. When performing the defrosting operation, the hot water generator 1 inverts the
four-way valve 17 such that the flow of the refrigerant is generated in the refrigeration
circuit 10 in the direction opposite to the flow of the refrigerant heating the water
into hot water. In the case of the defrosting operation, the four-way valve 17 causes
the refrigerant to circulate from the first refrigerant pipe 16a to the fifth refrigerant
pipe 16e and from the third refrigerant pipe 16c to the second refrigerant pipe 16b
(refrigerant flow indicated by the broken line in Fig. 1). In the case of the defrosting
operation, the air heat exchanger 12 functions as a condenser and the water heat exchanger
15 functions as an evaporator.
[0033] Further, the refrigeration circuit 10 may be dedicated to heating water without including
the four-way valve 17. In this case, the discharge side of the compressor 11 is connected
to the water heat exchanger 15 via the refrigerant piping 16, and the suction side
of the compressor 11 is connected to the air heat exchanger 12 via the refrigerant
piping 16.
[0034] The hydro unit 3 includes: the water heat exchanger 15 of the refrigeration circuit
10; an expansion tank (i.e., expansion vessel) 31; a water leading pipe 32 that leads
the water before heating from the outside of the hydro unit 3 to the water heat exchanger
15; a hot-water leading pipe 33 that leads the hot water heated by the water heat
exchanger 15 to the expansion tank 31; a hot-water supplying pipe 35 that supplies
the hot water heated by the water heat exchanger 15 to the outside of the hydro unit
3; a backup heater 67 that is disposed in the hot-water supplying pipe 35 and heats
the hot water to be sent from the expansion tank 31 to the outside of the hot-water
supplying pipe 35 up to a higher temperature; and a pump 36 that is disposed in the
hot-water supplying pipe 35 and sends the hot water from the expansion tank 31 to
the outside of the hydro unit 3.
[0035] The hydro unit 3 may be used for circulating hot water between the hydro unit 3 and
a device outside the hydro unit 3 or may be used for heating water outside the hydro
unit 3 into hot water and supplying the hot water to the outside of the hydro unit
3. The device outside the hydro unit 3 is, for example, a heating device (not shown)
or a hot water storage device (not shown) that heats water with the use of the circulating
hot water and stores the water heated by the hot water.
[0036] The hydro unit 3 further includes: refrigerant pipe connection joints 25 and 26 that
connect crossover pipes 21 and 22 of the refrigerant piping 16 to the refrigerant
piping 16 in the hydro unit 3; a water-leading-pipe connection joint 46 that connects
a water pipe 45 outside the hydro unit 3 to the water leading pipe 32; and a hot-water
pipe connection joint 48 that connects a hot-water pipe 47 outside the hydro unit
3 to the hot-water supplying pipe 35. These connection joints 25, 26, 46 and 48 are
screw-in pipe joints.
[0037] The crossover pipes 21 and 22 of the refrigerant piping 16 allow the refrigerant
to flow between the outdoor unit 2 and the hydro unit 3. The crossover pipe 21 is
part of the third refrigerant pipe 16c and is laid outside the outdoor unit 2 and
outside the hydro unit 3. The crossover pipe 22 is part of the fourth refrigerant
pipe 16d and is laid outside the outdoor unit 2 and outside the hydro unit 3. The
portion provided in the hydro unit 3 as part of the third refrigerant pipe 16c for
connecting the refrigerator pipe connection joint 25 to the water heat exchanger 15
is referred to as a first intra-hydro-unit refrigerant pipe 27. The portion provided
in the hydro unit 3 as part of the fourth refrigerant pipe 16d for connecting the
refrigerant pipe connection joint 26 to the water heat exchanger 15 is referred to
as a second intra-hydro-unit refrigerant pipe 28.
[0038] The hot-water pipe 47 is a crossover pipe that connects the hydro unit 3 and the
hot water supply place, and the water pipe 45 is a crossover pipe that connects the
hydro unit 3 and the water supply place. In the case of the circulation type, the
hot water supply place and the water supply place are connected.
[0039] The hot-water leading pipe 33 connects the upstream of the pump 36 and the downstream
of the backup heater 67 in the hot-water supplying pipe 35 to the expansion tank 31.
The hot-water leading pipe 33 leads the warmed and expanded hot water in the hot-water
supplying pipe 35 to the expansion tank 31. The expansion tank 31 has a function of
absorbing the expansion (increase in volume) of the warmed hot water.
[0040] The hot water, which is heated in the water heat exchanger 15 by the refrigerant
circulating in the refrigeration circuit 10, is sucked into the hot-water supplying
pipe 35 by the driven pump 36 and then is supplied to the hot water supply place through
the hot-water pipe 47 outside the hydro unit 3.
[0041] Fig. 2 is a perspective view of the hydro unit 3 when viewed from the diagonally
right front and from below.
[0042] Fig. 3 is an exploded perspective view of the hydro unit 3 when viewed from the diagonally
right front and from above.
[0043] As shown in Fig. 2 and Fig. 3, the hydro unit 3 of the hot water generator 1 according
to the present embodiment includes a longitudinally elongated rectangular housing
51.
[0044] The housing 51 has a front face 51f, a rear face 51r, a top face 51t, a bottom face
51b, and a pair of side faces 51s. The housing 51 includes: a front plate 52 that
covers the front face 51f; a rear plate 53 that covers the rear face 51r, a top plate
54 that covers the top face 51t; a bottom plate 55 that covers the bottom face 51b;
and a pair of side plates 56 and 57 that cover the respective side faces 51s.
[0045] The housing 51 accommodates the expansion tank 31, the water leading pipe 32, the
hot-water leading pipe 33, the hot-water supplying pipe 35, the pump 36, the water
heat exchanger 15 of the refrigeration circuit 10, the first intra-hydro-unit refrigerant
pipe 27, and the second intra-hydro-unit refrigerant pipe 28.
[0046] The housing 51 further accommodates: a controller accommodation box 61 that houses
the controller 5; and a controller supporting plate 62 that supports the controller
accommodation box 61 inside the housing 51. The controller accommodation box 61 is
a box that opens toward the front of the housing 51. In the controller accommodation
box 61, a board on which the controller 5 is mounted is supported.
[0047] The front plate 52 has an operation window 63 for disposing the remote controller
4. The back side of the front plate 52 is provided with a controller supporting plate
65 that supports the remote controller 4 disposed in the operation window 63. The
controller supporting plate 65 has a function of a lid that covers the controller
accommodation box 61.
[0048] The front plate 52, the rear plate 53, the top plate 54, the bottom plate 55, the
side plates 56 and 57, the controller accommodation box 61, the controller supporting
plate 62, and the controller supporting plate 65 are processed sheet metal products.
[0049] The water leading pipe 32, the hot-water leading pipe 33, the hot-water supplying
pipe 35, the pump 36, the water heat exchanger 15 of the refrigeration circuit 10,
the first intra-hydro-unit refrigerant pipe 27, and the second intra-hydro-unit refrigerant
pipe 28 are disposed in the space that is sandwiched between the rear plate 53 and
the controller supporting plate 62. The expansion tank 31 is disposed in the space
that is above the controller supporting plate 62 and sandwiched between the front
plate 52 and the rear plate 53.
[0050] As shown in Fig. 2 to Fig. 5, the rear plate 53 of the housing 51 in the hot water
generator 1 according to the present embodiment supports the expansion tank 31 and
the water heat exchanger 15 of the refrigeration circuit 10.
[0051] The expansion tank 31 has a cylindrical shape in which the length L in the direction
of the centerline C is larger in dimension than the diameter D. The expansion tank
31 is housed in the housing 51 such that the centerline C is oriented toward the pair
of side faces 51s. In other words, the length L of the expansion tank 31 is smaller
in dimension than the width of the housing 51. Further, the diameter D of the expansion
tank 31 is smaller in dimension than the height and the depth of the housing 51. The
expansion tank 31 is disposed at the top of the housing 51. The expansion tank 31
includes a cylindrical body portion 31a and a pair of end plates 31b and 31c that
close both ends of the body portion 31a. The expansion tank 31 is fixed to the rear
plate 53 by a saddle-shaped tank fixing band 66 extending on the body portion 31a.
The tank fixing band 66 fixes the expansion tank 31 to the rear plate 53 like a saddle
band used for fixing pipes. That is, the tank fixing band 66 is bent along the body
portion 31a from the upper portion to the lower portion of the body portion 31a so
as to fix the expansion tank 31 to the rear plate 53 of the housing 51.
[0052] The water leading pipe 32, the hot-water leading pipe 33, the hot-water supplying
pipe 35, the pump 36, the water heat exchanger 15 of the refrigeration circuit 10,
the first intra-hydro-unit refrigerant pipe 27, and the second intra-hydro-unit refrigerant
pipe 28 are disposed below the expansion tank 31.
[0053] The water heat exchanger 15 is disposed directly under the expansion tank 31 and
near the side plate 56 on one of the left and right sides of the housing 51 (on the
left side, in this case). The backup heater 67 is disposed directly under the expansion
tank 31 and near the side plate 57 on the other of the left and right sides of the
housing 51 (on the right side, in this case). The backup heater 67 is fixed to the
rear plate 53. Under the circumstances where the outside temperature is so extremely
low that heating the water into hot water by the refrigeration circuit 10 is difficult,
the backup heater 67 is used for assisting the heating of water and for further heating
the hot water that is already heated by the refrigeration circuit 10 into hotter water.
[0054] The pump 36 is disposed below the expansion tank 31, directly in front of the backup
heater 67, and on the bottom plate 55 of the housing 51. Directly below the pump 36,
the hot-water pipe connection joint 48 is provided. The hot-water pipe connection
joint 48 protrudes toward the outside of the housing 51. The hot-water pipe connection
joint 48 protrudes downward from the bottom plate 55 so as to be exposed to the outside
of the housing 51.
[0055] The water-leading-pipe connection joint 46 is provided behind the obliquely left
side of the hot-water pipe connection joint 48. The water leading pipe 32 connected
to the water-leading-pipe connection joint 46 bends toward the water heat exchanger
15 at the portion that enters the back side of the housing 51 from the bottom plate
55 of the housing 51, extends in the vicinity of the bottom plate 55 in parallel to
the bottom plate 55, and is connected to the back side of the lower end of the right
side-face of the water heat exchanger 15. The hot-water supplying pipe 35 is connected
to the back side of the upper end of the right side-face of the water heat exchanger
15. The hot-water supplying pipe 35 extends from the water heat exchanger 15 toward
the side plate 57 of the housing 51, bends at an intermediate position between the
water heat exchanger 15 and the backup heater 67 toward the bottom plate 55 of the
housing 51, hangs directly downward so as to extend in parallel to the bottom plate
55 at a portion reaching the lower end of the backup heater 67, and is connected to
the lower end of the left side-face of the backup heater 67. The hot-water leading
pipe 33 branches from the hot-water supplying pipe 35 via a cross-shaped branch at
the upper end of the front face of the backup heater 67, rises toward the top face
plate 54 of the housing 51, reaches substantially the same height as the centerline
C of the expansion tank 31, and bypasses the front of the expansion tank 31 so as
to be connected to the end plate 31b on the left side of the expansion tank 31.
[0056] The hot-water supplying pipe 35 extends downward from the cross-shaped branch so
as to reach the pump 36. That is, the pump 36 is connected to the outlet end of the
hot-water supplying pipe 35.
[0057] The first intra-hydro-unit refrigerant pipe 27 and the second intra-hydro-unit refrigerant
pipe 28 enter the housing 51 through a refrigerant-pipe insertion hole 71 provided
on the bottom plate 55 of the housing 51.
[0058] The first intra-hydro-unit refrigerant pipe 27 extends on the right side of the water
heat exchanger 15 toward the expansion tank 31, bends toward the water heat exchanger
15 near the front of the upper end of the right side-face of the water heat exchanger
15, and is connected to the water heat exchanger 15. The first intra-hydro-unit refrigerant
pipe 27 rises and extends almost directly in front of the hanging portion of the hot-water
supplying pipe 35. The refrigerant pipe connection joint 25 is provided at the end
of the first intra-hydro-unit refrigerant pipe 27 disposed outside the housing 51.
[0059] The second intra-hydro-unit refrigerant pipe 28 rises in parallel to the first intra-hydro-unit
refrigerant pipe 27 in the vicinity closer to the water heat exchanger 15 than the
first intra-hydro-unit refrigerant pipe 27, bends toward the water heat exchanger
15 near the front of the lower end of the right side-face of the water heat exchanger
15, and is connected to the water heat exchanger 15. The refrigerant pipe connection
joint 26 is provided at the end of the second intra-hydro-unit refrigerant pipe 28
disposed outside the housing 51.
[0060] Next, the anti-loosening structure of the hot-water pipe connection joint 48 will
be described.
[0061] As shown in Fig. 6 and Fig. 7, the pump 36 of the hot water generator 1 according
to the present embodiment includes a pump-inlet pipe joint 72 and a pump-outlet pipe
joint 73. The pump-inlet pipe joint 72 and the pump-outlet pipe joint 73 are screw-in
pipe joints. The pump-inlet pipe joint 72 and the pump-outlet pipe joint 73 are integrated
into the housing 75 of the pump 36. In addition, the pump-inlet pipe joint 72 and
the pump-outlet pipe joint 73 are arranged substantially in a straight line with the
housing 75 interposed therebetween. The pump 36 is housed inside the housing 51 in
such a manner that the pump-inlet pipe joint 72 faces upward and the pump-outlet pipe
joint 73 faces downward.
[0062] The hot-water pipe connection joint 48 for connecting the hot-water pipe 47 outside
the hydro unit 3 to the pump 36 is connected to the pump-outlet pipe joint 73. The
second hot-water pipe connection joint 76 for connecting the hot-water supplying pipe
35 to the pump 36 is connected to the pump-inlet pipe joint 72.
[0063] The housing 51 has a joint insertion hole 77 for projecting the hot-water pipe connection
joint 48 fixed to the pump-outlet pipe joint 73 to the outside of the housing 51.
The joint insertion hole 77 is provide on the bottom plate 55 of the housing 51.
[0064] The hot-water pipe connection joint 48 is an adapter for connecting the hot-water
pipe 47 outside the hydro unit 3 to the pump-outlet pipe joint 73 of the pump 36.
The hot-water pipe connection joint 48 is fixed to the pump-outlet pipe joint 73 so
as to be disposed outside the housing 51 through the joint insertion hole 77 of the
housing 51. The hot-water pipe connection joint 48 is connected to the hot-water pipe
47 outside the housing 51. The hot-water pipe connection joint 48 has a non-circular
outer shape when viewed in the direction of being connected to the pump-outlet pipe
joint 73. For example, the hot-water pipe connection joint 48 has an outer shape portion
48a in the shape of a hexagon nut.
[0065] The housing 51 is provided with a loosening prevention unit 81 that is provided at
the opening edge of the joint insertion hole 77 and prevents loosening of the hot-water
pipe connection joint 48 fixed to the pump-outlet pipe joint 73.
[0066] The loosening prevention unit 81 includes a plurality of anti-loosening pieces 82
(i.e., loosening prevention pieces 82) that protrude from the opening edge of the
joint insertion hole 77 to the outside of the housing 51 and prevent loosening of
the hot-water pipe connection joint 48 fixed to the pump-outlet pipe joint 73. The
anti-loosening pieces 82 are provided on the respective six sides of the joint insertion
hole 77 having a hexagonal hole shape so as to fit the outer shape portion 48a of
the hot-water pipe connection joint 48. Each anti-loosening piece 82 is a cut-up formed
by bending the material plate at the time of forming the joint insertion hole 77 on
the bottom plate 55, which is a processed sheet metal product.
[0067] At the time of connecting the hot-water pipe 47 outside the hydro unit 3 to the hot-water
pipe connection joint 48, force for fastening the hot-water pipe 47 to the hot-water
pipe connection joint 48 acts on the hot-water pipe connection joint 48. This force
acts in the direction of twisting the hot-water pipe connection joint 48. If the loosening
prevention unit 81 is not provided, this force may act on the connection portion between
the pump-outlet pipe joint 73 and the hot-water pipe connection joint 48, which may
loosen the hot-water pipe connection joint 48 connected to the pump-outlet pipe joint
73. For this reason, the loosening prevention unit 81 bears the force for fastening
the hot-water pipe 47 to the hot-water pipe connection joint 48 with the housing 51,
and prevents the hot-water pipe connection joint 48 connected to the pump-outlet pipe
joint 73 from loosening.
[0068] As shown in Fig. 8 to Fig. 9G, the hot water generator 1 according to the present
embodiment includes: an anti-loosening member 85 (i.e., loosening prevention member
85) that is fixed to the outside of the housing 51 and intervenes between the housing
51 and the hot-water pipe connection joint 48 so as to prevent loosening of the hot-water
pipe connection joint 48 connected to the pump-outlet pipe joint 73; and a plurality
of fastening members 86 that fix the anti-loosening member 85 to the housing 51.
[0069] The housing 51 includes a plurality of first fixing holes 87 that are annularly arranged
to form a circle C1 centered on the joint insertion hole 77.
[0070] The anti-loosening member 85 includes: a hexagonal fitting hole 88 into which the
outer shape portion 48a of the hot-water pipe connection joint 48 can be fitted; and
a plurality of second fixing holes 89 that are annularly arranged to form a circle
C2 centered on the fitting hole 88 and each has an elongated hole shape along the
circle C2.
[0071] The plurality of first fixing holes 87 are annularly arranged along the circle C1
at equal intervals. The plurality of second fixing holes 89 are annularly arranged
along the circle C2 at equal intervals.
[0072] Further, the number N1 of the first fixing holes 87 is larger than the number N2
of the second fixing holes 89.

[0073] The combination of the number N1 of the first fixing holes 87 and the number N2 of
the second fixing holes 89 is set to be continuous even numbers or continuous multiples
of 3. When the combination of the number N1 of the first fixing holes 87 and the number
N2 of the second fixing holes 89 is expressed as (N1, N2), this combination is set
to be, for example, (10, 8), (12, 10), (14, 12), (12, 9), or (15, 12).
[0074] When the angle obtained by dividing 360° by the number N1 of the first fixing holes
87 is defined as a first angle Θ1 and the angle obtained by dividing 360° by the number
N2 of the second fixing holes 89 is defined as a second angle Θ2, the opening range
θr of the plurality of second fixing holes 89 in the direction along the circle C2
is larger than the angle range obtained by subtracting the first angle Θ1 from the
second angle Θ2.

[0075] The first angle Θ1 represents the arranged interval (i.e., so-called pitch) of the
plurality of first fixing holes 87 by an angle. The second angle Θ2 represents the
arranged interval (i.e., so-called pitch) of the plurality of second fixing holes
89 by an angle.
[0076] In terms of preventing loosening of the hot-water pipe connection joint 48, it is
preferred that the dimension of the opening of each second fixing hole 89 in the direction
along the circle C2, i.e., length of each second fixing hole 89, which is a slotted
hole, in the longitudinal direction is not too large. Thus, the opening range θr and
the diameter dimension of the circle C2 are appropriately set.
[0077] Fig. 9A to Fig. 9G illustrate a case where the above-described relationship between
the first fixing holes 87 and the second fixing holes 89 is established and the combination
of the number N1 of the first fixing holes 87 and the number N2 of the second fixing
holes 89 is set to (12, 9). In this case, the first angle Θ1 is 30° and the second
angle Θ2 is 40°. Thus, the opening range θr is larger than 10°. The opening range
θr is satisfactory if the anti-loosening member 85 can move within the calculated
range "second angle θ2 - first angle θ1" when the fastening members 86 are inserted
into the first fixing holes 87 of the housing 51 and are in a loose state. The opening
range θr is satisfactory if the thickness of the fastening member 86 is added to this
calculated range "θ2-θ1".
[0078] When Fig. 9A is defined as the reference position of the fastening position of the
hot-water pipe connection joint 48, i.e., 0° position, Fig. 9B to Fig. 9G show the
respective states where the fastening positions of the hot-water pipe connection joint
48 differ from one another by 5°. That is, Fig. 9A shows the 0-degree fastening position,
Fig. 9B shows the 5° fastening position, Fig. 9C shows the 10° fastening position,
Fig. 9D shows the 15° fastening position, and Fig. 9E shows the 20° fastening position,
Fig. 9F shows the 25° fastening position, and Fig. 9G shows the 30° fastening position.
[0079] In any of the fastening states of Fig. 9A to Fig. 9G, there are three combinations
of the first fixing holes 87 and the second fixing holes 89that overlap each other
so as to enable the fastening member 86 to be tightened therethrough. Since the hot-water
pipe connection joint 48, which has the outer shape portion 48a in the shape of a
hexagon nut, is in the same fastening state at every 30°, the anti-loosening member
85 can always be fixed to the housing 51 with three fastening members 86. The anti-loosening
member 85 may be fixed to the housing 51 with two fastening members 86. When the combination
of the number N1 of the first fixing holes 87 and the number N2 of the second fixing
holes 89 is set to be consecutive even numbers, the anti-loosening member 85 can always
be fixed to the housing 51 with two fastening members 86. Thus, the anti-loosening
member 85 bears the force for fastening the hot-water pipe 47 to the hot-water pipe
connection joint 48 in cooperation with the housing 51, and thereby prevents the hot-water
pipe connection joint 48 connected to the pump-outlet pipe joint 73 from loosening.
[0080] The fitting hole 88 of the anti-loosening member 85 may be provided with anti-loosening
pieces 82 as shown in Fig. 6 and Fig. 7.
[0081] As shown in Fig. 10 and Fig. 11 in addition to Fig. 6, the hot-water supplying pipe
35 of the hot water generator 1 according to the present embodiment includes a hot-water
pipe outlet pipe-joint 91. The hot-water pipe outlet pipe-joint 91 is a screw-in pipe
joint. The hot-water pipe outlet pipe-joint 91 is provided at the connection end of
the hot-water supplying pipe 35. The hot-water pipe outlet pipe-joint 91 is an adapter
for connecting the hot-water supplying pipe 35 to the second hot-water pipe connection
joint 76. The hot-water pipe outlet pipe-joint 91 is interdigitated with the second
hot-water pipe connection joint 76. A sealing material 92 such as an O-ring is sandwiched
between the hot-water pipe outlet pipe-joint 91 and the second hot-water pipe connection
joint 76. The hot-water pipe outlet pipe-joint 91 includes a first fixing flange 95.
[0082] The second hot-water pipe connection joint 76 is an adapter for connecting the hot-water
supplying pipe 35 to the pump-inlet pipe joint 72 of the pump 36. The second hot-water
pipe connection joint 76 is a screw-in pipe joint that can be connected to the pump-inlet
pipe joint 72 of the pump 36, and is also a screw-in pipe joint that can be connected
to the hot-water pipe outlet pipe-joint 91 of the hot-water supplying pipe 35. The
second hot-water pipe connection joint 76 includes a second fixing flange 96.
[0083] When the hot-water pipe outlet pipe-joint 91 is inserted into the second hot-water
pipe connection joint 76, the first fixing flange 95 and the second fixing flange
96 are brought into surface contact with each other so as to be aligned.
[0084] The hot-water pipe outlet pipe-joint 91 and the second hot-water pipe connection
joint 76 are connected by a fixture 97 and are fixed to the housing 51. The fixture
97 fixes the hot-water pipe outlet pipe-joint 91 and the second hot-water pipe connection
joint 76 to the housing 51 via the backup heater 67 which is fixed to the housing
51. Note that the fixture 97 may be fixed directly to the housing 51.
[0085] The fixture 97 is a saddle-shaped saddle band that is bent to cover the hot-water
pipe outlet pipe-joint 91 and the second hot-water pipe connection joint 76 in the
direction orthogonal to the insertion direction of the hot-water pipe outlet pipe-joint
91 and the second hot-water pipe connection joint 76. The fixture 97 holds the first
fixing flange 95 and the second fixing flange 96 together so as to connect the screw-in
pipe joints. Both ends of the fixture 97 are fixed to the backup heater 67 with fastening
members 98 such as screws.
[0086] The diameter D1 of the first fixing flange 95 (i.e., widest dimension in the polygon)
and the diameter D2 of the second fixing flange 96 are larger than the arch height
H of the fixture 97. The diameter D1 of the first fixing flange 95 and the diameter
D2 of the second fixing flange 96 may be larger than the arch width W of the fixture
97. The diameter D1 of the first fixing flange 95 and the diameter D2 of the second
fixing flange 96 may be larger than the arch height H of the fixture 97 and larger
than the arch width W. In other words, it is sufficient if magnitude relationship
of these dimensions satisfies one or both of Expression 3 and Expression 4 below.

[0087] The fixture 97 has slits 99 through which the first fixing flange 95 of the hot-water
pipe outlet pipe-joint 91 and the second fixing flange 96 of the second hot-water
pipe connection joint 76 are inserted together. It is preferred that the width S of
each slit 99 satisfies the following two conditions. Firstly, the width S of each
slit 99 is larger than the sum of the thickness T1 of the first fixing flange 95 and
the thickness T2 of the second fixing flange 96 such that the first fixing flange
95 and the second fixing flange 96 can be readily inserted into the slits 99. Secondly,
the width S of each slit 99 is narrow enough to reliably maintain interdigitation
between the hot-water pipe outlet pipe-joint 91 and the second hot-water pipe connection
joint 76 so as to prevent water leakage from the connection portion between the hot-water
pipe outlet pipe-joint 91 and the second hot-water pipe connection joint 76.
[0088] Thus, the fixture 97 can connect the first fixing flange 95 of the hot-water pipe
outlet pipe-joint 91 and the second fixing flange 96 of the second hot-water pipe
connection joint 76 while supporting the pump 36 to the housing 51. Such a fixture
97 can reduce the number of components and contribute to weight reduction and cost
reduction of the hydro unit 3, as compared with the case of using a member for supporting
the pump 36 to the housing 51 and another separate member for connecting the first
fixing flange 95 of the hot-water pipe outlet pipe-joint 91 to the second fixing flange
96 of the second hot-water pipe connection joint 76.
[0089] The fixture 97 may have a rectangular saddle shape as shown in Fig. 10 and Fig. 11,
a triangular saddle shape, a pentagonal or larger polygonal saddle shape, or an arcuate
saddle shape. In the polygonal saddle-shaped fixture 97, the slits 99 are preferably
provided discretely (i.e., at intervals or discontinuously) so as to avoid vertices
as shown in Fig. 10 and Fig. 11. In this case, the fixture 97 can readily obtain sufficient
strength for connecting the first fixing flange 95 of the hot-water pipe outlet pipe-joint
91 and the second fixing flange 96 of the second hot-water pipe connection joint 76
while supporting the pump 36.
[0090] It is preferred that the slits 99 are off the center of the bandwidth of the fixture
97 that extends in a band shape. In other words, it is preferred that the fixture
97 has a narrow continuous portion 97n extending along one side of the slits 99 and
a wide continuous portion 97w extending along the other side of the slits 99. The
fixture 97 desirably connects the first fixing flange 95 of the hot-water pipe outlet
pipe-joint 91 and the second fixing flange 96 of the second hot-water pipe connection
joint 76 so as to support the pump 36, in a state where the narrow continuous portion
97n is disposed above the first fixing flange 95 and the second fixing flange 96 and
the wide continuous portion 97w is disposed below the first fixing flange 95 and the
second fixing flange 96. The fixture 97 configured to support the pump 36 in this
manner can more reliably support the pump 36 than the case where the slits 99 are
formed along the center of the bandwidth of the fixture 97. Since the fixture 97 has
the wide continuous portion 97w, the fixture 97 can contribute to reduction in material
cost and weight by the narrow continuous portion 97n while maintaining the same strength
as a fixture in which slits are formed along the center of the bandwidth.
[0091] The pump 36 may be supported by the housing 51 by means of the anti-loosening structure
of the hot-water pipe connection joint 48 connected to the pump-outlet pipe joint
73 or may be supported by the housing 51 by means of the fixing structure of the second
hot-water pipe connection joint 76 connected to the pump-inlet pipe joint 72. The
pump 36 may be supported by the housing 51 by means of one of the anti-loosening structure
of the hot-water pipe connection joint 48 and the fixing structure of the second hot-water
pipe connection joint 76. It is preferred that the pump 36 is supported by the housing
51 by means of the anti-loosening structure of the hot-water pipe connection joint
48.
[0092] As described above, the hot water generator 1 according to the present embodiment
includes the hot-water pipe connection joint 48 that is fixed to the pump-outlet pipe
joint 73 of the pump 36 so as to be disposed outside the housing 51 through the joint
insertion hole 77 and is connectable to the hot-water pipe 47 for sending hot water
to the hot water supply place. In other words, the hot water generator 1 can connect
the hot-water pipe 47 to the hot-water pipe connection joint 48, which is fixed directly
to the pump-outlet pipe joint 73 of the pump 36. Thus, at the time of connecting the
hot-water pipe 47 configured as a crossover pipe to the hot-water pipe connection
joint 48, the force for fastening the hot-water pipe 47 to the hot-water pipe connection
joint 48 does not act on the relay pipe between the pump 36 and the hot-water pipe
connection joint 48 and water leakage due to loosening of the joint for connecting
the relay pipe is not induced in the hot water generator 1. In other words, the hot
water generator 1 does not require a pipe that relays the pump 36 and the hot-water
pipe connection joint 48 and/or a fixture that fixes this relay pipe to the housing,
and thus, the hot water generator 1 can reduce the pressure loss of the relay pipe
and contribute to miniaturization of the housing, improvement of commercial value
due to the miniaturization, and cost reduction. In the hot water generator 1, the
joint that may be loosened by the force for fastening the hot-water pipe 47 to the
hot-water pipe connection joint 48 can be readily limited to the hot-water pipe connection
joint 48, which is fixed to the pump-outlet pipe joint 73 of the pump 36. Even if
the hot-water pipe connection joint 48 fixed to the pump-outlet pipe joint 73 of the
pump 36 becomes loose, the looseness can be restored immediately.
[0093] In addition, the hot water generator 1 according to the present embodiment includes
the loosening prevention unit 81 that is provided on the opening edge of the joint
insertion hole 77 of the housing 51 so as to prevent loosening of the hot-water pipe
connection joint 48. Hence, the hot water generator 1 can bear the force for fastening
the hot-water pipe 47 to the hot-water pipe connection joint 48 by the housing 51
and can prevent the hot-water pipe connection joint 48 connected to the pump-outlet
pipe joint 73 from loosening.
[0094] Further, the hot water generator 1 according to the present embodiment includes the
plurality of second fixing holes 89 that has the opening range α larger than the angle
range obtained by subtracting the first angle θ1 from the second angle θ2, wherein
the first angle θ1 is obtained by dividing 360° by the number N1 of the first fixing
holes 87 and the second angle θ2 is the angle obtained by dividing 360° by the number
N2 of the second fixing holes 89. Thus, the hot water generator 1 can bear the force
for fastening the hot-water pipe 47 to the hot-water pipe connection joint 48 by the
anti-loosening member 85 and the housing 51 and can prevent the hot-water pipe connection
joint 48 connected to the pump-outlet pipe joint 73 from loosening.
[0095] According to the hot water generator 1 of the present embodiment, connection of the
hot-water pipe 47 extending to the hot water supply place for supplying hot water
can be achieved without loosening the pump-outlet pipe joint 73 of the pump 36 and
without inducing water leakage due to the loosening of the pump-outlet pipe joint
73 of the pump 36.
[0096] While certain embodiments have been described, these embodiments have been presented
by way of example only, and are not intended to limit the scope of the inventions.
Indeed, the novel embodiments described herein may be embodied in a variety of other
forms; furthermore, various omissions, substitutions and changes in the form of the
embodiments described herein may be made without departing from the spirit of the
inventions. The accompanying claims and their equivalents are intended to cover such
forms or modifications as would fall within the scope and spirit of the inventions.
REFERENCE SIGNS LIST
[0097]
- 1
- hot water generator
- 2
- outdoor unit
- 3
- hydro unit
- 4
- remote controller
- 5
- controller
- 10
- refrigeration circuit
- 11
- compressor
- 12
- air heat exchanger
- 13
- expansion valve
- 15
- water heat exchanger
- 16
- refrigerant piping
- 32
- water leading pipe
- 33
- hot-water leading pipe
- 35
- hot-water supplying pipe
- 36
- pump
- 45
- water pipe
- 46
- water-leading-pipe connection joint
- 47
- hot-water pipe
- 48
- hot-water pipe connection joint
- 51
- housing
- 51f
- front face
- 51r
- rear face
- 51t
- top face
- 51b
- bottom face
- 51s
- side face
- 52
- front plate
- 53
- rear plate
- 54
- top plate
- 55
- bottom plate
- 56, 57
- side plate
- 71
- refrigerant-pipe insertion hole
- 72
- pump-inlet pipe joint
- 73
- pump-outlet pipe joint
- 75
- housing of pump
- 76
- second hot-water pipe connection joint
- 77
- joint insertion hole
- 81
- loosening prevention unit
- 82
- anti-loosening piece
- 85
- anti-loosening member
- 86
- fastening member
- 87
- first fixing hole
- 88
- fitting hole
- 89
- second fixing hole
- 91
- hot-water pipe outlet pipe-joint
- 95
- first fixing flange
- 96
- second fixing flange
- 97
- fixture
- 97n
- narrow continuous portion
- 97w
- wide continuous portion
- 98
- fastening member
- 99
- slit