FIELD OF THE INVENTION
[0001] The present invention relates to a flue hood for collecting flue gas and discharging
it outdoors, also relates to a gas water heating appliance including the flue hood.
BACKGROUND OF THE INVENTION
[0002] Gas water heating appliances generally includes gas water heaters and gas boilers.
A typical gas water heater can provide sanitary hot water for domestic usage, such
as use in the kitchen, laundry, and bath. The water heater may include a gas burner
for combustion of a gas-air mixture, heat exchanger coils for heating water as it
flow therethrough, and hydraulic pipes connected with external plumbling for supplying
hot water. A typical gas boiler is operable to heat water which is pumped around a
boiler circuit. The boiler circuit is typically connected, via suitable valves to
space heaters, such as radiators or under floor heating loop, so that the heat output
from the boiler can be used for central heating purposes.
[0003] The gas water heating appliances can be installed indoors with combustion flue gas
being discharged outdoors through flue pipes. However, due to the gas combustion is
done inside of dwellings, the security risk may be raised in case that gas leak of
the appliance happens. In order to avoid this problem, some of the gas water heating
appliances are developed to be installed outdoors. As shown in a Chinese Utility Model
CN2438051Y, a gas water heater is installed outdoors, so that it is able to be separated with
users and will not occupy the indoor space. A flue hood having the features specified
in the preamble of claim 1 is known from
EP 0400757 A2.
[0004] Nevertheless, outdoor gas water heating appliances often suffer from invasion of
winds and rains, and once the winds or rains enter the appliances through the flue
hoods, the combustion is inevitably affected. The aforementioned Chinese utility model
also discloses an improved flue hood. Such flue hood has a winding flue gas channel
and some tongue plates retained in the channel, by this configuration, some of winds
and/or rains can be prevented from entering the appliances.
[0005] The tongue plates standing in the flue gas channel are used to resist rains and winds,
however, in order to ensure the exhaust of the flue gas, relatively large gaps are
defined between the tongue plates, and these gaps can allow a certain amount of winds
and rains to enter the appliances, on the other side, the tongue plates may hinder
the exhaust of the flue gas to some extent.
SUMMARY OF THE INVENTION
[0006] It is an object of present invention to provide a flue hood adapted for outdoor gas
water heating appliances, wherein, the flue hood is able to effectively resist winds
and rains, and in the mean time, to ensure a smooth exhaust of the flue gas; also,
provide a gas water heating appliance employing such flue hood.
[0007] According to one aspect of the present invention there is provided a flue hood including
a shell and a movable baffle. The shell has a gas intake port, a gas exhaust port,
and a flue gas channel in communication with the gas intake port and the gas exhaust
port. The movable baffle is movably disposed in the flue gas channel to change an
opening size in a cross section of the flue gas channel.
[0008] Preferably, the movable baffle is pivotable on a pivot disposed in the flue gas channel.
[0009] The movable baffle has a first position and a second position; when the movable baffle
is located at the first position, the flue gas channel has a smallest opening size
in the cross section; when the movable baffle is located at the second position, the
flue gas channel has a larger opening size in the cross section.
[0010] According to the invention, the movable baffle further has a third position, and
the first position is between the second and the third positions; when the movable
baffle is located at the third position, the opening size in the cross section is
larger than that as the movable baffle is located at the first position but smaller
than that as the movable baffle is located at the second position.
[0011] Preferably, the opening size in the cross section is defined by a gap between bottom
of the movable baffle and a bottom wall of the flue gas channel.
[0012] Preferably, the flue hood further includes a fixed plate engageable with the movable
baffle to control the opening size in the cross section.
[0013] Preferably, the movable baffle has a vertical portion and a bending portion bending
from the vertical portion.
[0014] Preferably, when the movable baffle is located at the first position, the vertical
portion of the movable baffle is flush with an upright section of the fixed plate,
and the bending portion of the movable baffle and the upright section of the fixed
plate forms an angel with respect to each other; when the movable baffle is located
at the second position, each of the vertical portion and the bending portion forms
an angle with respect to the upright section of the fixed plate; when the movable
baffle is located at the third position, the bending portion of the movable baffle
abuts against the upright section of the fixed plate, and the vertical portion of
the movable baffle and the upright section of the fixed plate forms an angel with
respect to each other.
[0015] Preferably, the flue gas channel has a bottom wall extending between the gas exhaust
port and the gas intake port, and at least a part of the bottom wall extends obliquely
upwardly from the gas exhaust port.
[0016] According to another aspect of the present invention there is provided a gas water
heating appliance including a housing, a burner, a heat exchanger, and a flue hood
as described above. The burner is disposed in the housing to generate heat. The heat
exchanger is adapted for absorbing the heat and transferring the heat to water passing
therethrough. The flue hood is adapted for receiving flue gas generated by the burner
and discharging it outdoors, and the flue hood is disposed in the housing with the
gas exhaust port being exposed outside of the housing.
[0017] By employing a movable baffle in the flue gas channel, when there is incoming external
winds and/or rains, the movable baffle is able to restrict the opening size in the
cross section of the flue gas channel thereby resisting the winds and/or rains, on
the other side, when there is exhaust of flue gas, the movable baffle can be pushed
by the gas flow to enlarge the opening size in the cross section of the flue gas channel
to allow the flue gas to be discharged out smoothly.
[0018] The foregoing has outlined rather broadly the features and technical advantages of
the present invention in order that the detailed description of the invention that
follows may be better understood. Additional features and advantages of the invention
will be described hereinafter which form the subject of the claims of the invention.
BRIEF DESCRIPTION OF THE DRAWINGS
[0019] For a more complete understanding of the present invention, and the advantages thereof,
reference is now made to the following descriptions taken in conjunction with the
accompanying drawings, in which:
Fig. 1 is a planar view showing a gas water heating appliance in accordance with an
embodiment of the present invention;
Fig. 2 is an perspective view showing the appliance of Fig. 1 with a front plate being
removed;
Fig. 3 is a planar view showing the appliance of Fig. 1 with a side plate being removed;
Fig. 4 is a perspective view showing a flue hood in accordance with an embodiment
of the present invention;
Fig. 5 is a front view showing the flue hood of Fig. 4;
Figs. 6A to 6C are cross sectional views taken along line A-A of Fig. 5, wherein Figs.
6A, 6B, 6C respectively show a first position, a second position, and a third position
of a movable baffle of the flue hood.
Fig. 7 is a perspective view showing a rain shield of the appliance of Fig. 1;
Fig. 8 is a top view of the rain shield of Fig. 7;
Fig. 9 is a side view of the rain shield of Fig. 7;
Fig. 10 is similar to Fig. 5, which shows a flue hood in accordance with another embodiment
of the present invention;
Fig. 11 is similar to Fig. 6A, which is a cross sectional view of the flue hood of
Fig. 10.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0020] Reference will now be made to the drawing figures to describe the preferred embodiments
of the present invention in detail. However, the embodiments can not be used to restrict
the present invention. Changes such as structure, method and function obviously made
to those of ordinary skill in the art are also protected by the present invention.
[0021] Gas water heaters and gas boilers could be fired with combustible gas, such as natural
gas, city gas, liquefied petroleum gas, methane, etc., thereby supplying hot water
and/or heating living space for domestic sanitary usage and heating purpose. The embodiments
to be described below take a gas water heater as an example, however, the present
invention is not limited to this, and it can also be applied on gas boilers
[0022] First referring to Figs. 1 to 3, a gas water heating appliance 1 in accordance with
one embodiment of present invention is adapted to be mounted outdoors, which includes
a housing 10, a flue hood 20, a heat exchanger 107, a burner 104, an air supply fan
105, an air pressure switch 30, and an inlet tube 101, an outlet tube 102, a gas supply
pipe 103 extending out of the housing 10.
[0023] The housing 10 may be composed of a number of plates, such as a front plate 11, a
back plate, a top plate, a bottom plate 12, and a pair of side plates. In this embodiment,
the back plate and the bottom plate 12 are integrally formed in a first piece, and
the front plate 11, the top plate, the pair of side plates are integrally formed in
a second piece. In course of assembling the appliance, the components can be first
mounted on the first piece, then the second piece is mounted on the first piece to
complete the assembling. In this way, the assembling can be more simple. When the
appliance is installed on a wall, the back plate faces the wall, and an air inlet
is provided in the plates different from the back plate. The air inlet can be defined
in the front plate 11, the side plate, or even in the bottom plate 12, and in this
embodiment, the air inlet 111 is defined at a lower portion of the front plate 11.
[0024] The burner 104 has a casing and a number of burner blades (not shown) arranged side
by side in the casing. Each burner blade generally defines therein a gas-air mixture
passage for mixing fuel gas supplied from the gas supply pipe 103 and combustion air
supplied by the air supply fan 105, and delivering the gas-air mixture to top thereof
for being ignited and burning. As the configuration and arrangement of the burner
blades are well known in the art, a detailed description is omitted for purpose of
brevity and simplicity.
[0025] The heat exchanger 107 is placed above the burner 104. The heat exchanger 107 may
include multiple heat absorbing fins and a heat absorbing pipe passing through the
multiple heat absorbing fins. The heat absorbing pipe is connected with an upstream
water supply channel and a downstream hot water delivering channel. Water passing
through the inlet tube 101 and the upstream water supply channel is then heated in
the heat exchanger 107 by heat interchanging with combustion exhaust gas of the burner
104. Heated hot water is fed to the downstream hot water delivering channel and further
passes through the outlet tube 102 for domestic sanitary use, such as drinking, showering,
or bathing.
[0026] In this embodiment, the air supply Fan 105 is provided below the burner 104, which
is operated to supply outside air to the burner 104 as combustion air, also, force
the flue gas to flow into the flue hood 20 and further to be discharged outdoors.
[0027] The flue hood 20 is mounted upon the heat exchanger 107 for collecting the combustion
gas containing carbon monoxide and nitric oxides and expelling it outdoors. With reference
to Fig. 4, Fig. 5, and Figs. 6A to 6C, the flue hood 20 has a shell, in this embodiment,
along the exhaust direction of the flue gas, the shell sequently includes a back part
23, a front part 21, and a projection part 22 projected from the front part 21. When
the flue hood 20 is mounted in the housing 10, the projection part 22 is exposed outside
of the housing 10.
[0028] The back part 23 is retained on top of the heat exchanger 107, and its bottom is
opened to define a gas intake port 231. The projection part 22 defines a gas exhaust
port 221 at a front end thereof, and a number of drainage holes 222 are defined at
the bottom of the front end. The flue hood 20 defines therein a flue gas channel 232
between the gas intake port 231 and the gas exhaust port 221. The front part 21 has
a bottom wall extending between the gas intake port 223 and the gas exhaust port 221,
and at least a part of the bottom wall extends obliquely upwardly from the gas exhaust
port 201, which is able to hinder external winds and rains entering the appliance
through the gas exhaust port 221 to some extent. Even if external rains pass through
the gas exhaust port 221 and enter the flue hood, the oblique bottom wall can guide
the rains downstream and flow out via drainage holes 222.
[0029] A movable baffle 242 is provided in the flue gas channel 232 for the purpose of changing
an opening size in a cross section of the flue gas channel. In this embodiment, the
movable baffle 242 is pivotably disposed in the back part 23, which includes a vertical
portion 2421 and a bending portion 2422 bending from a top of the vertical portion
2421. A fixed plate 241 is mounted in the flue gas channel 232. The fixed plate 241
has a horizontal section 2411 fixedly mounted on a top wall of the flue gas channel
232 by means of soldering or riveting, and a upright section 2412 perpendicular to
the horizontal section 2411 providing a pivot 243 at a distal end thereof. The pivot
243 is connected to the movable baffle 242 at a junction of the vertical portion 2421
and the bending portion 2422, so that the movable baffle 242 is pivotable on this
pivot 243.
[0030] In this embodiment, the movable baffle 242 is engaged with the fixed plate 241 to
change the opening size in the cross section of the flue gas channel 232. The fixed
plate 241 and the movable baffle 242 together occupy the cross section of the flue
gas channel 232 where they are located. To ensure the movable baffle is able to move
smoothly, there may exist clearance between the lateral sides of the fixed plate 241
and the movable baffle 242 and side walls of the flue gas channel 232, and the clearance
distance can be equal or less than 1mm. In course of a pivotal movement of the movable
baffle 242, a gap exists between the bottom of the movable baffle 242 and the bottom
wall of the flue gas channel 232, and this gap can define the opening in the cross
section of the flue gas channel 232.
[0031] Figs. 6A-6C show the movable baffle 242 is located in a first position, a second
position, and a third position respectively. As shown in Fig. 6A, when there is no
exhaust of flue gas, and no incoming of external winds and/or rains, the movable baffle
242 is located at a first position where it is in a suspending state. At this time,
the vertical portion 2421 of the movable baffle is flush with the upright section
2412 of the fixed plate, and the bending portion 2422 of the movable baffle and the
upright section 2412 of the fixed plate forms an angel with respect to each other.
In the first position, the opening in the cross section of the flue gas channel 232
has the smallest size, and the bottom of the movable baffle 242 just contacts the
bottom wall of the flue gas channel 232. Preferably, in this position, there exists
a first gap between the bottom of the movable baffle 242 and the bottom wall of the
flue gas channel 232, and the distance d1 of the first gap is around 1.2mm. In this
way, once external rains splash on the movable baffle 242 in the cold weather, the
rains can drip on bottom wall of the flue gas channel 232 and drain out, otherwise,
a frozen might be formed between the bottom of the movable baffle 242 and the bottom
wall of the flue gas channel 232 and cause a blockage of the flue gas channel 232.
[0032] As indicated by arrows shown in Fig. 6B, when there is an exhaust of flue gas, or
there are both an exhaust of flue gas and an incoming of external winds and the flue
gas is stronger than the external winds, the movable baffle 242 is pushed to the second
position by the gas flow. In this position, each of the vertical portion 2421 and
the bending portion 2422 forms an angle with respect to the upright section 2412 of
the fixed plate, and a second gap is defined between the bottom of the movable baffle
242 and the bottom wall of the flue gas channel 232. The second gap has a gap distance
d2 which is larger than the first gap distance d1, in other words, at this position,
the opening in the cross section of the flue gas channel 232 is larger than that in
the first position, and the size of the second gap distance depends on the force exerted
by the gas flow.
[0033] According to the invention, as indicated by arrows shown in Fig. 6C, when there is
an incoming of external winds, or there are both an exhaust of flue gas and an incoming
of external winds and the external winds is stronger than the flue gas, the movable
baffle 242 is pushed to the third position by the external winds. The third position
and the second position are located at opposite sides of the first position. At the
third position, a third gap is defined between the bottom of the movable baffle 242
and the bottom wall of the flue gas channel 232. In most cases, the third gap has
a gap distance d3 which is larger than the first gap distance d1 but smaller than
the second gap distance d2, in other words, in this position, the opening in the cross
section of the flue gas channel 232 is larger than that in the first position but
smaller than in the second position, and the size of the third gap distance depends
on the force exerted by the external winds. The embodiment of Fig. 6C shows a largest
size of the third gap distance, at this time, the bending portion 2422 of the movable
baffle abuts against the upright section 2412 of the fixed plate, and the vertical
portion 2421 of the movable baffle and the upright section 2412 of the fixed plate
forms an angel with respect to each other. In this way, even there exists both an
exhaust of flue gas and an incoming of external winds and the external winds is stronger
than the gas flow, the flue gas is still able to be discharged out through the third
gap.
[0034] As the embodiments shown above, when there is incoming external winds and/or rains,
the movable baffle is able to engage with the fixed plate to restrict the opening
size in the cross section of the flue gas channel thereby resisting the winds and/or
rains, on the other side, when there is exhaust of flue gas, the movable baffle can
be pushed by the gas flow to enlarge the opening size in the cross section of the
flue gas channel to allow the flue gas to be discharged out smoothly. In addition,
since the movable baffle employs a bending portion, even the incoming winds and discharged
flue gas both exist and the winds is stronger than the gas flow, the opening in the
cross section of the flue gas channel still has a small size to ensure the flue gas
can be discharged out. It would be apparent to those skilled in the art that, the
bending portion of the movable baffle can be omitted, and in such case, the movable
baffle does not have the third position. Moreover, the movement of the movable baffle
is not restricted to a pivotal motion, it can move along a linear direction in other
embodiments. For example, the movable baffle can be disposed on the oblique part 221
of the bottom wall of the flue gas channel 232, and the opening in the cross section
is defined by a top of the movable baffle and the top wall of the flue gas channel
232, whose size can be adjusted by a linear motion of the movable baffle on the oblique
part 221 of the bottom wall.
[0035] Refer back to Fig. 2, an air pressure switch 30 is mounted in the housing 10, and
it has a negative pressure port 301 and a positive pressure port 302. The negative
pressure port 301 is connected to the air supply fan 105 via a first tube 31 for sensing
the negative pressure generated by the fan 105, and the positive pressure port 302
is connected to the atmosphere through a second tube 32. In the state of art, when
adverse winds enter the appliance via the gas exhaust port 221 of the flue hood 20,
the pressure switch 30 will sense the negative pressure changes caused by speed changes
of the fan 405, which may result in a shut-off of the appliance. However, in this
invention, since the pressure exerted by the adverse winds can also be detected at
the positive pressure port 302, the pressure change at the negative pressure port
301 is counterbalanced by the pressure change at the positive port 302, therefore,
the air pressure switch 30 would not be affected by adverse winds, and the misoperation
to the appliance caused by adverse winds can be avoided.
[0036] With reference to Figs. 4, 5, and 6A to 6C, in order to ensure the pressure detected
at the positive pressure port 301 is as close as possible to the pressure exerted
by adverse winds, a first air intake hole 223 is provided adjacent to the gas exhaust
port 221, and the second tube 32 is connected between the first air intake hole 223
and the positive pressure port 301. By this means, the adverse winds passing through
the gas exhaust port 221 can reach the positive pressure port 301 via the first air
intake hole 223 and the second tube 32. In a preferred embodiment, the first air intake
hole 223 is defined in a front end of the projection part 22 of the flue hood 20.
[0037] In the embodiments aforementioned, as rains invade the flue hood 20 via the gas exhaust
port 221, the rains can flow into the second tube 32 through the first air intake
hole 223 and reach the positive pressure port 302, which may cause a damage the air
pressure switch if the rains contact electronic parts. Figs. 10 and 11 illustrate
a further embodiment, a second air intake hole 224 is provided adjacent to the gas
exhaust port 221, preferably, the air intake hole 224 is defined in the front end
of the projection part 22, and it is located above the first air intake hole 223.
The second tube 32 includes a connection tube section 322 connected between the first
and the second air intake holes 223, 224, and an extension tube section 323 is connected
between the connection tube section 322 and the positive pressure port 302 of the
air pressure switch. Wherein, the connection tube section 322 is U shaped, and the
extension tube section 323 is at least partly located above the second air intake
hole 224.
[0038] In this way, when external rains enter the connection tube section 322 through the
first air intake hole 223 and/or the second air intake hole 224, the rains will not
enter the extension tube section 323 because the extension tube section 323 is at
least partly located above the second air intake hole 224, then the rains drain out
through the first air intake hole 223. When external winds enter the connection tube
part 322 through the first hole 223 and the second hole 224, the two flow of winds
converge and enter the extension tube part 323. Referring to Fig. 4, in a preferred
embodiment, a venting hole 321 is provided in the extension tube section 323, in order
to make the positive pressure port 302 to communicate with the atmosphere in case
the first and the second air intake holes 223, 224 are jammed. Of course, in other
embodiments, the first and the second air intake holes 223, 224 can be replaced by
the venting hole 321 to establish air connection between the positive pressure port
302 and the atmosphere.
[0039] Referring again to Fig. 2, in conjunction with Fig. 7 to Fig. 9, a rain shield 40
is provided in the housing 10 and adjacent to the air inlet 111 to prevent rains from
entering inside of the appliance. The rain shield 40 includes a main panel 41, a top
panel 411, a bottom panel 412, and a pair of side panels 42, 43.
[0040] The main panel 41 faces to the air inlet 111. The top panel 411 is bended from top
of the front panel 41, and extends obliquely downwardly toward the air inlet 111.
The bottom panel 412 is perpendicularly bended from bottom of the main panel 41 and
extends toward the air inlet 111 as well. The pair of side panels 42, 43 is perpendicularly
bended from opposite sides of the main panel 41 and extends away from the air inlet
111. At least one of the side plates is provided with a number of openings, and in
a preferred embodiment, both of the side panels 42, 43 has the openings 421, 431.
By this means, rains splashed into the appliance via the air inlet 111 can be resisted
mainly by the main panel 41, and the openings 421, 431 defined in the side panels
allow air to come inside of the appliance for combustion purpose.
[0041] A number of rain resisting tabs 422, 432 are provided near the openings 421, 431
on the side panels 42, 43. Each rain resisting tab 422, 432 has an inclined portion
4221, 4321 extending obliquely from one edge of the opening 421, 431, and a parallel
portion 4222, 4322 extending from the inclined portion and in parallel with the side
panels 42, 43. This configuration is able to further avoid the rains splashing into
the appliance.
[0042] The rain shield 40 is mounted in the housing 10 by its bottom panel 412 being connected
to the bottom plate 12 through screw means. The bottom panel 412 of the rain shield
40 defines a number of drain ports 4121 therein, and the bottom plate 12 of the housing
10 is provided with a number of drain slots 122 corresponding to the drain ports 4121.
In this way, the rains resisted by the main panel 41 can drain out of the appliance
through the drain ports 4121 and the drain slots 122. In addition, the bottom plate
12 is provided with a step 121 located adjacent to a mounting position of the rain
shield 40 on the bottom plate 12, and this step can act as an obstruction to prevent
the rains resisted by the main panel 41 from entering at the mounting position.
[0043] It is to be understood, however, that even though numerous, characteristics and advantages
of the present invention have been set forth in the foregoing description, together
with details of the structure and function of the invention, the disclosed is illustrative
only, and changes may be made in detail, especially in matters of number, shape, size,
and arrangement of parts within the principles of the invention to the full extent
indicated by the broadest general meaning of the terms in which the appended claims
are expressed.
1. A flue hood (20) comprising:
a shell having a gas intake port (231), a gas exhaust port (221), and a flue gas channel
(232) in communication with the gas intake port and the gas exhaust port; and
a movable baffle (242) movably disposed in the flue gas channel (232) to change an
opening size in a cross section of the flue gas channel; wherein
said movable baffle (242) has a first position and a second position; when the movable
baffle is located at the first position, the flue gas channel has a smallest opening
size in the cross section; when the movable baffle is located at the second position,
the flue gas channel has a larger opening size in the cross section; characterised in that
said movable baffle (242) further has a third position, and the first position is
between the second and the third positions; when the movable baffle is located at
the third position, the opening size in the cross section is larger than that as the
movable baffle is located at the first position but smaller than that as the movable
baffle is located at the second position.
2. A flue hood according to claim 1, wherein said movable baffle (242) is pivotable on
a pivot (243) disposed in the flue gas channel.
3. A flue hood according to claim 1, wherein said opening size in the cross section is
defined by a gap between bottom of the movable baffle and a bottom wall of the flue
gas channel.
4. A flue hood according to claim 1, further comprising a fixed plate (241) engageable
with the movable baffle to control the opening size in the cross section.
5. A flue hood according to claim 4, wherein said movable baffle has a vertical portion
(2421) and a bending portion (2422) bending from the vertical portion.
6. A flue hood according to claim 5, wherein when the movable baffle is located at the
first position, the vertical portion (2421) of the movable baffle is flush with an
upright section (2412) of the fixed plate, and the bending portion (2422) of the movable
baffle and the upright section (2412) of the fixed plate forms an angel with respect
to each other; when the movable baffle is located at the second position, each of
the vertical portion (2421) and the bending portion (2422) forms an angle with respect
to the upright section (2412) of the fixed plate; when the movable baffle is located
at the third position, the bending portion (2422) of the movable baffle abuts against
the upright section (2412) of the fixed plate, and the vertical portion (2421) of
the movable baffle and the upright section (2412) of the fixed plate forms an angel
with respect to each other.
7. A flue hood according to claim 1, wherein said flue gas channel has a bottom wall
extending between the gas exhaust port (221) and the gas intake port (231), and at
least a part of the bottom wall extends obliquely upwardly from the gas exhaust port.
8. A gas water heating appliance (1) comprising:
a housing (10);
a burner (104) disposed in the housing to generate heat;
a heat exchanger (107) for absorbing the heat and transferring the heat to water passing
therethrough; and
a flue hood (20) according to any of the preceding claims for receiving flue gas generated
by the burner and discharging it outdoors, said flue hood being disposed in the housing
with the gas exhaust port (221) being exposed outside of the housing.
1. Abzugshaube (20), umfassend:
eine Hülle, die eine Gaseinlassöffnung (231), eine Gasauslassöffnung (221) und einen
Abgaskanal (232) in Verbindung mit der Gaseinlassöffnung und der Gasauslassöffnung
aufweist; und
ein bewegliches Leitblech (242), das beweglich in dem Abgaskanal (232) angeordnet
ist, um eine Öffnungsgröße in einem Querschnitt des Abgaskanals zu ändern;
wobei
das bewegliche Leitblech (242) eine erste Position und eine zweite Position aufweist;
wenn das bewegliche Leitblech bei der ersten Position liegt, der Abgaskanal eine kleinste
Öffnungsgröße in dem Querschnitt aufweist; wenn das bewegliche Leitblech bei der zweiten
Position liegt, der Abgaskanal eine größere Öffnungsgröße in dem Querschnitt aufweist;
dadurch gekennzeichnet, dass
das bewegliche Leitblech (242) weiter eine dritte Position aufweist und die erste
Position zwischen der zweiten und der dritten Position ist; wenn das bewegliche Leitblech
bei der dritten Position liegt, die Öffnungsgröße in dem Querschnitt größer als jene
ist, wenn das bewegliche Leitblech bei der ersten Position liegt, aber kleiner als
jene ist, wenn das bewegliche Leitblech bei der zweiten Position liegt.
2. Abzugshaube nach Anspruch 1, wobei das bewegliche Leitblech (242) an einem Schwenkgelenk
(243) schwenkbar ist, das in dem Abgaskanal angeordnet ist.
3. Abzugshaube nach Anspruch 1, wobei die Öffnungsgröße in dem Querschnitt durch einen
Spalt zwischen Boden des beweglichen Leitblechs und einer Bodenwand des Abgaskanals
definiert ist.
4. Abzugshaube nach Anspruch 1, weiter umfassend eine fixierte Platte (241), die mit
dem beweglichen Leitblech eingreifen kann, um die Öffnungsgröße in dem Querschnitt
zu steuern.
5. Abzugshaube nach Anspruch 4, wobei das bewegliche Leitblech einen vertikalen Abschnitt
(2421) und einen Biegungsabschnitt (2422) aufweist, der sich von dem vertikalen Abschnitt
biegt.
6. Abzugshaube nach Anspruch 5, wobei, wenn das bewegliche Leitblech bei der ersten Position
liegt, der vertikale Abschnitt (2421) des beweglichen Leitblechs mit einem aufrechten
Bereich (2412) der fixierten Platte bündig ist und der Biegungsabschnitt (2422) des
beweglichen Leitblechs und der aufrechte Bereich (2412) der fixierten Platte einen
Winkel in Bezug aufeinander bilden; wenn das bewegliche Leitblech bei der zweiten
Position liegt, sowohl der vertikale Abschnitt (2421) als auch der Biegeabschnitt
(2422) einen Winkel in Bezug auf den aufrechten Bereich (2412) der fixierten Platte
bildet; wenn das bewegliche Leitblech bei der dritten Position liegt, der Biegungsabschnitt
(2422) des beweglichen Leitblechs an den aufrechten Bereich (2412) der fixierten Platte
angrenzt und der vertikale Abschnitt (2421) des beweglichen Leitblechs und der aufrechte
Bereich (2412) der fixierten Platte einen Winkel in Bezug zueinander bilden.
7. Abzugshaube nach Anspruch 1, wobei der Abgaskanal eine Bodenwand aufweist, die sich
zwischen der Gasauslassöffnung (221) und der Gaseinlassöffnung (231) erstreckt, und
mindestens ein Teil der Bodenwand sich schräg von der Gasauslassöffnung nach oben
erstreckt.
8. Gas-Wassererwärmungsgerät (1), umfassend:
ein Gehäuse (10);
einen Brenner (104), der in dem Gehäuse angeordnet ist, um Wärme zu erzeugen;
einen Wärmetauscher (107) zum Absorbieren der Wärme und Übertragen der Wärme an Wasser,
das hindurchfließt; und
eine Abzugshaube (20) nach einem der vorstehenden Ansprüche, zum Empfangen von Abgas,
das von dem Brenner erzeugt wird, und Ausstoßen davon nach draußen, wobei die Abzugshaube
in dem Gehäuse angeordnet ist, wobei die Gasauslassöffnung (221) außerhalb des Gehäuses
freigelegt ist.
1. Hotte aspirante (20) comprenant :
une coque présentant un orifice d'admission de gaz (231), un orifice d'échappement
de gaz (221), et un canal de gaz de fumées (232) en communication avec l'orifice d'admission
de gaz et l'orifice d'échappement de gaz ; et
un déflecteur mobile (242) disposé de manière mobile dans le canal de gaz de fumées
(232) pour changer une taille d'ouverture dans une section transversale du canal de
gaz de fumées ; dans lequel
ledit déflecteur mobile (242) présente une première position et une deuxième position
; lorsque le déflecteur mobile est positionné dans la première position, le canal
de gaz de fumées présente une taille d'ouverture la plus petite dans la section transversale
; lorsque le déflecteur mobile est positionné dans la deuxième position, le canal
de gaz de fumées présente une taille d'ouverture plus grande dans la section transversale
; caractérisée en ce que
ledit déflecteur mobile (242) présente en outre une troisième position, et la première
position est entre les deuxième et troisième positions ; lorsque le déflecteur mobile
est positionné dans la troisième position, la taille d'ouverture dans la section transversale
est plus grande que celle lorsque le déflecteur mobile est positionné dans la première
position mais plus petite que celle lorsque le déflecteur mobile est positionné dans
la deuxième position.
2. Hotte aspirante selon la revendication 1, dans laquelle ledit déflecteur mobile (242)
est pivotant sur un pivot (243) disposé dans le canal de gaz de fumées.
3. Hotte aspirante selon la revendication 1, dans laquelle ladite taille d'ouverture
dans la section transversale est définie par une fente entre le fond du déflecteur
mobile et une paroi inférieure du canal de gaz de fumées.
4. Hotte aspirante selon la revendication 1, comprenant en outre une plaque fixée (241)
pouvant être mise en prise avec le déflecteur mobile pour commander la taille d'ouverture
dans la section transversale.
5. Hotte aspirante selon la revendication 4, dans laquelle ledit déflecteur mobile présente
une portion verticale (2421) et une portion de flexion (2422) pliant à partir de la
portion verticale.
6. Hotte aspirante selon la revendication 5, dans laquelle lorsque le déflecteur mobile
est positionné dans la première position, la portion verticale (2421) du déflecteur
mobile est alignée sur une section verticale (2412) de la plaque fixée, et la portion
de flexion (2422) du déflecteur mobile et la section verticale (2412) de la plaque
fixée forment un angle l'une par rapport à l'autre ; lorsque le déflecteur mobile
est positionné dans la deuxième position, chacune de la portion verticale (2421) et
la portion de flexion (2422) forme un angle par rapport à la section verticale (2412)
de la plaque fixée ; lorsque le déflecteur mobile est positionné dans la troisième
position, la portion de flexion (2422) du déflecteur mobile bute contre la section
verticale (2412) de la plaque fixée, et la portion verticale (2421) du déflecteur
mobile et la section verticale (2412) de la plaque fixée forment un angle l'une par
rapport à l'autre.
7. Hotte aspirante selon la revendication 1, dans laquelle ledit canal de gaz de fumées
présente une paroi inférieure s'étendant entre l'orifice d'échappement de gaz (221)
et l'orifice d'admission de gaz (231), et au moins une partie de la paroi inférieure
s'étend en oblique vers le haut depuis l'orifice d'échappement de gaz.
8. Appareil de chauffe-eau à gaz (1) comprenant :
un boîtier (10) ;
un brûleur (104) disposé dans le boîtier pour générer de la chaleur ;
un échangeur de chaleur (107) pour l'absorption de la chaleur et le transfert de la
chaleur à l'eau passant au travers de celui-ci ; et
une hotte aspirante (20) selon l'une quelconque des revendications précédentes pour
la réception de gaz de fumées généré par le brûleur et son évacuation vers l'extérieur,
ladite hotte aspirante étant disposée dans le boîtier avec l'orifice d'échappement
de gaz (221) étant exposé à l'extérieur du boîtier.