[TECHNICAL FIELD]
[0001] The present invention relates to a scroll compressor used for an air conditioner,
a hot water supplying system and a freezing machine such as a refrigerator.
[BACKGROUND TECHNIQUE]
[0002] A scroll compressor is used in a freezing machine and an air conditioner. The scroll
compressor sucks gas refrigerant evaporated by an evaporator, compresses the gas refrigerant
up to pressure required for condensing the gas refrigerant by a condenser, and sends
out the high temperature and high pressure gas refrigerant into a refrigerant circuit.
[0003] In such a scroll compressor, an oil storage section for storing lubricant oil therein
is formed in a bottom of a hermetic container, and a rotation shaft oil support hole
extending from a lower end of a rotation shaft to an eccentric shaft is formed. Lubricant
oil stored in the oil storage section is introduced into the eccentric shaft through
the rotation shaft oil support hole.
[0004] Therefore, when the compressor is actuated, there is a problem that a slight time
delay is generated until lubricant oil is supplied from the oil storage section to
the eccentric shaft. To solve the shortage of lubricant oil around the eccentric shaft
generated when the compressor is again actuated, it is proposed to provide an oil
reservoir in an upper surface of the eccentric shaft (patent document 1).
[PRIOR ART DOCUMENT]
[Patent Document]
[0005] [Patent Document 1] Japanese Patent Application Laid-open No.
S62-142885
[SUMMARY OF THE INVENTION]
[PROBLEM TO BE SOLVED BY THE INVENTION]
[0006] However, there is a case where lubricant oil guided to the eccentric shaft is further
guided to an outer periphery of an orbiting scroll mirror plate, and when the compressor
is again actuated, it is necessary to swiftly guide the lubricant oil from the oil
reservoir to the outer periphery of the orbiting scroll mirror plate.
[0007] Hence, it is an object of the present invention to provide a scroll compressor capable
of swiftly guiding lubricant oil which is stored in the oil reservoir when the compressor
is stopped to the outer periphery of the orbiting scroll mirror plate by a centrifugal
force when the compressor is again actuated.
[MEANS FOR SOLVING THE PROBLEM]
[0008] A first aspect of the present invention provides a scroll compressor in which a compressing
mechanism for compressing refrigerant and an electric mechanism for driving the compressing
mechanism are placed in a hermetic container, an oil storage section for storing lubricant
oil therein is formed in a bottom of the hermetic container, the compressing mechanism
includes a fixed scroll, an orbiting scroll and a rotation shaft for driving the orbiting
scroll in an orbiting manner, the fixed scroll includes a disk-like fixed scroll mirror
plate and a fixed spiral lap standing on the fixed scroll mirror plate, the orbiting
scroll includes a disk-like orbiting scroll mirror plate, an orbiting spiral lap standing
on a lap-side end surface of the orbiting scroll mirror plate, and a boss portion
formed on an opposite side from the lap-side end surface of the orbiting scroll mirror
plate, an eccentric shaft inserted into the boss portion is formed on an upper end
of the rotation shaft, the fixed spiral lap and the orbiting spiral lap are meshed
with each other, and a plurality of compression chambers are formed between the fixed
spiral lap and the orbiting spiral lap, a main bearing for supporting the fixed scroll
and the orbiting scroll is provided below the fixed scroll and the orbiting scroll,
a bearing for pivotally supproting the rotation shaft and a boss storing section for
storing the boss portion therein are formed in the main bearing, a rotation restraining
member for restraining rotation of the orbiting scroll is provided between the fixed
scroll and the main bearing, a rotation shaft oil support hole extending from a lower
end of the rotation shaft to the eccentric shaft is formed in the rotation shaft,
and the orbiting scroll mirror plate is provided with a first oil introduction hole
formed in the boss portion, a first oil derivation hole formed in an outer periphery
of the lap-side end surface, and a first mirror plate oil communication path for bringing
the first oil introduction hole and the first oil derivation hole into communication
with each other, wherein an oil reservoir is formed in an upper surface of the eccentric
shaft, and the oil reservoir is placed between a rotation shaft center of the rotation
shaft and the first oil introduction hole.
[0009] According to a second aspect of the invention, in the scroll compressor of the first
aspect, the boss storing section is a high pressure region, an outer periphery of
the orbiting scroll where the rotation restraining member is placed is an intermediate
pressure region, and the orbiting scroll is pushed against the fixed scroll, the fixed
scroll is provided with a fixed scroll sliding surface which slides with respect to
the orbiting scroll mirror plate located closer to an outer periphery of the orbiting
spiral lap than the orbiting spiral lap, the intermediate pressure region is formed
on a location closer to the outer periphery of the orbiting spiral lap than the fixed
scroll sliding surface, the fixed scroll sliding surface is provided with a sliding
surface groove which is in communication with the intermediate pressure region, the
lubricant oil stored in the oil storage section is introduced into the boss portion
through the rotation shaft oil support hole, the lubricant oil introduced into the
boss portion is introduced into the sliding surface groove through the first mirror
plate oil communication path, and the lubricant oil introduced into the sliding surface
groove is introduced into the intermediate pressure region.
[0010] According to a third aspect of the invention, in the scroll compressor of the second
aspect, the first oil derivation hole and the sliding surface groove are brought into
communication with each other at a rotation position where an eccentric shaft center
of the eccentric shaft comes closest to the sliding surface groove.
[0011] According to a fourth aspect of the invention, in the scroll compressor of any one
of the first to third aspects, as the compression chamber, a first compression chamber
is formed on an outer wall side of the orbiting spiral lap, and a second compression
chamber is formed on an inner wall side of the orbiting spiral lap, a suction volume
of the first compression chamber is made larger than a suction volume of the second
compression chamber, the fixed scroll mirror plate is provided with an intermediate
pressure extraction hole through which intermediate pressure of the compression chamber
is taken out, and an intermediate pressure communication path for bringing the intermediate
pressure extraction hole and the intermediate pressure region are into communication
with each other is formed in the fixed scroll.
[0012] According to a fifth aspect of the invention, in the scroll compressor of any one
of the fourth aspect, a high pressure communication path for bringing the intermediate
pressure extraction hole and a high pressure space in the hermetic container into
communication with each other is formed in the fixed scroll, and a balance valve is
provided in pressure opening of the high pressure communication path.
[0013] According to a sixth aspect of the invention, in the scroll compressor of any one
of the second to fifth aspects, the orbiting scroll mirror plate is provided with
a second oil introduction hole which opens from the intermediate pressure region,
a second oil derivation hole which opens from a low pressure space of the compression
chamber and a second mirror plate oil communication path for bringing the second oil
introduction hole and the second oil derivation hole into communication with each
other, and the lubricant oil introduced into the intermediate pressure region is introduced
in to the low pressure space of the compression chamber through the second mirror
plate oil communication path.
[EFFECT OF THE INVENTION]
[0014] According to the present invention, lubricant oil stored in the oil reservoir when
a compressor is stopped can swiftly be guided to an outer periphery of an orbiting
scroll mirror plate by a centrifugal force when the compressor is again actuated.
[BRIEF DESCRIPTION OF THE DRAWINGS]
[0015]
Fig. 1 is a vertical sectional view of a scroll compressor of an embodiment of the
present invention;
Fig. 2 is an enlarged sectional view of essential portions of a compressing mechanism
shown in Fig. 1;
Figs. 3 are plane views of a fixed scroll and an orbiting scroll shown in Figs. 1
and 2;
Figs. 4 are explanatory diagrams showing a supplying operation of lubricant oil existing
in a boss portion into an intermediate pressure region;
Figs. 5 are explanatory diagrams showing a deriving operation of lubricant oil existing
in the intermediate pressure region into a compression chamber;
Figs. 6 are explanatory diagrams showing a positional relation between a refueling
pathway and a sealing member associated with orbiting motion of the scroll compressor;
Fig. 7 is a graph showing pressure variation of intermediate pressure which is taken
out from an intermediate pressure extraction hole in the scroll compressor of the
embodiment;
Fig. 8 is a graph showing pressure variation of intermediate pressure which is taken
out from the intermediate pressure extraction hole in a scroll compressor as a comparative
example; and
Fig. 9 is a graph showing pressure variation of intermediate pressure which is taken
out from an intermediate pressure extraction hole in a scroll compressor as another
comparative example.
[MODE FOR CARRYING OUT THE INVENTION]
[0016] In the first aspect of the present invention, an oil reservoir is formed in an upper
surface of the eccentric shaft, and the oil reservoir is placed between a rotation
shaft center of the rotation shaft and the first oil introduction hole. According
to the first aspect, lubricant oil stored in the oil reservoir when the compressor
is stopped, can swiftly be guided to the first oil introduction hole by a centrifugal
force when the compressor is again actuated.
[0017] According to the second aspect, in addition to the first aspect, the boss storing
section is a high pressure region, an outer periphery of the orbiting scroll where
the rotation restraining member is placed is an intermediate pressure region, and
the orbiting scroll is pushed against the fixed scroll, the fixed scroll is provided
with a fixed scroll sliding surface which slides with respect to the orbiting scroll
mirror plate located closer to an outer periphery of the orbiting spiral lap than
the orbiting spiral lap, the intermediate pressure region is formed on a location
closer to the outer periphery of the orbiting spiral lap than the fixed scroll sliding
surface, the fixed scroll sliding surface is provided with a sliding surface groove
which is in communication with the intermediate pressure region, the lubricant oil
stored in the oil storage section is introduced into the boss portion through the
rotation shaft oil support hole, the lubricant oil introduced into the boss portion
is introduced into the sliding surface groove through the first mirror plate oil communication
path, and the lubricant oil introduced into the sliding surface groove is introduced
into the intermediate pressure region. According to the second aspect, lubricant oil
can intermittently be supplied to the intermediate pressure region by communication
between a first oil derivation hole formed in an outer periphery of a lap-side end
surface and the sliding surface groove formed in the fixed scroll sliding surface.
Further, according to the second aspect, since the close contact state of the lap-side
end surface and the fixed scroll sliding surface is maintained without separating
them from each other, an amount of oil can be adjusted by the first oil derivation
hole and the sliding surface groove, and it is easy to adjust the oil amount.
[0018] According to the third aspect, in addition to the second aspect, the first oil derivation
hole and the sliding surface groove are brought intocommunication with each other
at a rotation position where an eccentric shaft center of the eccentric shaft comes
closest to the sliding surface groove. According to the third aspect, the largest
centrifugal force is applied to lubricant oil existing in the boss portion at a rotation
position where the eccentric shaft center of the eccentric shaft comes closest to
the sliding surface groove. Therefore, lubricant oil can reliably be introduced into
the sliding surface groove by bringing the first oil derivation hole and the sliding
surface groove into communication with each other when the largest centrifugal force
is applied to the lubricant oil existing in the boss portion.
[0019] According to the fourth aspect, in addition to any one of the first to third aspects,
as the compression chamber, a first compression chamber is formed on an outer wall
side of the orbiting spiral lap, and a second compression chamber is formed on an
inner wall side of the orbiting spiral lap, a suction volume of the first compression
chamber is made larger than a suction volume of the second compression chamber, the
fixed scroll mirror plate is provided with an intermediate pressure extraction hole
through which intermediate pressure of the compression chamber is taken out, and an
intermediate pressure communication path for bringing the intermediate pressure extraction
hole and the intermediate pressure region into communication with each other is formed
in the fixed scroll. According to the fourth aspect, especially under low compression
ratio condition, it is possible to prevent the orbiting scroll from separating from
the fixed scroll, and airtightness of the compression chamber can be enhanced.
[0020] According to the fifth aspect, in addition to the fourth aspect, a high pressure
communication path for bringing the intermediate pressure extraction hole and a high
pressure space in the hermetic container into communication with each other is formed
in the fixed scroll, and a balance valve is provided in a high pressure opening of
the high pressure communication path. According to the fifth aspect, if intermediate
pressure in mid-flow of compression of the compression chamber becomes excessively
high, intermediate pressure in mid-flow of compression of the compression chamber
is adjusted to predetermined pressure by opening the balance valve, and it is possible
to reduce a compression ratio of the low compression ratio condition at which the
orbiting scroll separates from the fixed scroll.
[0021] According to the sixth aspect, in addition to any one of the second to fifth aspects,
the orbiting scroll mirror plate is provided with a second oil introduction hole which
opens from the intermediate pressure region, a second oil derivation hole which opens
from a low pressure space of the compression chamber and a second mirror plate oil
communication path for bringing the second oil introduction hole and the second oil
derivation hole into communication with each other, and the lubricant oil introduced
into the intermediate pressure region is introduced in to the low pressure space of
the compression chamber through the second mirror plate oil communication path. According
to the sixth aspect, lubricant oil in the intermediate pressure region can be circulated
by guiding, to the low pressure space of the compression chamber, lubricant oil which
is guided to the intermediate pressure region, and it is possible to prevent oil from
being deteriorated by shortage of oil supply in the intermediate pressure region and
by accumulation of lubricant oil.
[EMBODIMENT]
[0022] An embodiment of the present invention will be described below with reference to
the drawings. The invention is not limited to the embodiment.
[0023] Fig. 1 is a vertical sectional view of a scroll compressor of the embodiment.
[0024] An embodiment of the present invention will be described below with reference to
the drawings. The invention is not limited to the embodiment.
[0025] Fig. 1 is a vertical sectional view of a scroll compressor of the embodiment.
[0026] A compressing mechanism 10 for compressing refrigerant and an electric mechanism
20 for driving the compressing mechanism 10 are placed in a hermetic container 1.
[0027] The hermetic container 1 is composed of a torso 1a extending along a vertical direction
and formed into a cylindrical shape, an upper lid 1c for closing an upper opening
of the torso 1a, and a lower lid 1b for closing a lower opening of the torso 1a.
[0028] The hermetic container 1 is provided with a refrigerant suction pipe 2 for introducing
refrigerant into the compressing mechanism 10, and a refrigerant discharge pipe 3
for discharging refrigerant compressed by the compressing mechanism 10 to a location
outside the hermetic container 1.
[0029] The compressing mechanism 10 includes a fixed scroll 11, an orbiting scroll 12 and
a rotation shaft 13 for driving the orbiting scroll 12 in an orbiting manner.
[0030] The electric mechanism 20 includes a stator 21 fixed to the hermetic container 1,
and a rotor 22 placed on an inner side of the stator 21. The rotation shaft 13 is
fixed to the rotor 22. An eccentric shaft 13a which is decentered eccentrically with
respect to the rotation shaft 13 is formed on an upper end of the rotation shaft 13.
[0031] An oil reservoir 80 is formed in the eccentric shaft 13a by a recess which opens
from an upper surface of the eccentric shaft 13a.
[0032] A main bearing 30 which supports the fixed scroll 11 and the orbiting scroll 12 are
provided below the fixed scroll 11 and the orbiting scroll 12.
[0033] A bearing 31 for pivotally supproting the rotation shaft 13, and a boss storing section
32 are formed in the main bearing 30. The main bearing 30 is fixed to the hermetic
container 1 by welding or shrinkage fitting.
[0034] The fixed scroll 11 includes a disk-like fixed scroll mirror plate 11a, a fixed spiral
lap 11b standing on the fixed scroll mirror plate 11a, and an outer peripheral wall
11c standing such that it surrounds a periphery of the fixed spiral lap 11b. A discharge
port 14 is formed in a substantially center portion of the fixed scroll mirror plate
11a.
[0035] The orbiting scroll 12 includes a disk-like orbiting scroll mirror plate 12a, an
orbiting spiral lap 12b standing on a on a lap-side end surface of the orbiting scroll
mirror plate 12a, and a cylindrical boss portion 12c formed on an end surface of the
orbiting scroll mirror plate 12a on an opposite side from the lap side.
[0036] The fixed spiral lap 11b of the fixed scroll 11 and the orbiting spiral lap 12b of
the orbiting scroll 12 mesh with each other, and a plurality of compression chambers
15 are formed between the fixed spiral lap 11b and the orbiting spiral lap 12b.
[0037] The boss portion 12c is formed at a substantially central portion of the orbiting
scroll mirror plate 12a. The eccentric shaft 13a is inserted into the boss portion
12c, and the boss portion 12c is stored in the boss storing section 32.
[0038] The fixed scroll 11 is fixed to a main bearing 30 at the outer peripheral wall 11c
through a plurality of bolts 16. The orbiting scroll 12 is supported on the fixed
scroll 11 through a rotation restraining member 17 such as an Oldham ring. The rotation
restraining member 17 which restrains rotation of the orbiting scroll 12 is provided
between the fixed scroll 11 and the main bearing 30. According to this, the orbiting
scroll 12 orbits without rotating with respect to the fixed scroll 11.
[0039] A lower end 13b of the rotation shaft 13 is pivotally supported by an auxiliary bearing
18 placed on an lower portion of the hermetic container 1.
[0040] An oil storage section 4 for storing lubricant oil is formed in a bottom portion
of the hermetic container 1.
[0041] A lower end of the rotation shaft 13 is provided with a displacement oil pump 5.
The oil pump 5 is placed such that its suction port exists in the oil storage section
4. The oil pump 5 is driven by the rotation shaft 13. The oil pump 5 can reliably
pump up lubricant oil existing in the oil storage section 4 provided in a bottom of
the hermetic container 1 irrespectively of pressure condition or operation speed,
and fear of shortage of oil is resolved.
[0042] A rotation shaft oil support hole 13c extending from the lower end 13b of the rotation
shaft 13 to the eccentric shaft 13a is formed in the rotation shaft 13.
[0043] Lubricant oil pumped up by the oil pump 5 is supplied into a bearing of the auxiliary
bearing 18, the bearing 31 and the boss portion 12c through the rotation shaft oil
support hole 13c formed in the rotation shaft 13.
[0044] Refrigerant sucked from the refrigerant suction pipe 2 is guided from the suction
port 15a into the compression chambers 15. The compression chambers 15 move while
reducing their volumes from an outer peripheral side toward a central portion, refrigerant
whose pressure reaches a predetermined value in the compression chambers 15 is discharged
from a discharge port 14 provided in a central portion of the fixed scroll 11 into
the discharge chamber 6. The discharge port 14 is provided with a discharge reed valve
(not shown). The refrigerant whose pressure reaches a predetermined value in the compression
chamber 15 pushes and opens the discharge reed valve and is discharged into the discharge
chamber 6. The refrigerant which is discharged into the discharge chamber 6 is derived
into an upper portion in the hermetic container 1, the refrigerant passes through
a refrigerant passage (not shown) formed in the compressing mechanism 10, reaches
a periphery of the electric mechanism 20, and is discharged from the refrigerant discharge
pipe 3.
[0045] Fig. 2 is an enlarged sectional view of essential portions of the compressing mechanism
shown in Fig. 1.
[0046] According to the scroll compressor of the embodiment, the boss storing section 32
is a high pressure region A, an outer periphery of the orbiting scroll 12 where the
rotation restraining member 17 is placed is an intermediate pressure region B, and
the orbiting scroll 12 is pushed against the fixed scroll 11.
[0047] The eccentric shaft 13a is inserted into the boss portion 12c through the orbiting
bearing 13d such that the eccentric shaft 13a can orbit and drive. An oil groove 13e
is formed in an outer peripheral surface of the eccentric shaft 13a.
[0048] A thrust surface of the main bearing 30 which receives thrust force of the orbiting
scroll mirror plate 12a is provided with a ring-shaped sealing member 33. The sealing
member 33 is placed on an outer periphery of the boss storing section 32.
[0049] The hermetic container 1 is filled with refrigerant having the same high pressure
as refrigerant discharged into the discharge chamber 6. Since the rotation shaft oil
support hole 13c opens from an upper end of the eccentric shaft 13a, an interior of
the boss portion 12c becomes a high pressure region A which has the same pressure
as a discharged refrigerant.
[0050] Lubricant oil which is introduced into the boss portion 12c through the rotation
shaft oil support hole 13c is supplied to the orbiting bearing 13d and the boss storing
section 32 by the oil groove 13e formed in the outer peripheral surface of the eccentric
shaft 13a. Since the outer periphery of the boss storing section 32 is provided with
the sealing member 33, the boss storing section 32 is the high pressure region A.
[0051] The fixed scroll mirror plate 11a is provided with an intermediate pressure extraction
hole 41 through which intermediate pressure of the compression chamber 15 is taken
out, a mirror plate-side intermediate pressure communication path 42a which is in
communication with the intermediate pressure extraction hole 41, and a high pressure
communication path 71 which brings the intermediate pressure extraction hole 41 and
a high pressure space in the hermetic container 1 into communication with each other.
A high pressure opening 72 of the high pressure communication path 71 is provided
with a balance valve 73.
[0052] The outer peripheral wall 11c of the fixed scroll 11 is provided with a peripheral
wall-side intermediate pressure communication path 42b which brings a mirror plate-side
intermediate pressure communication path 42a and the intermediate pressure region
B into communication with each other.
[0053] The mirror plate-side intermediate pressure communication path 42a and the peripheral
wall-side intermediate pressure communication path 42b form an intermediate pressure
communication path 42. The intermediate pressure communication path 42 is formed in
the fixed scroll 11, and brings the intermediate pressure extraction hole 41 and the
intermediate pressure region B into communication with each other.
[0054] By forming, in the fixed scroll 11, the intermediate pressure communication path
42 which brings the intermediate pressure extraction hole 41 and the intermediate
pressure region B into communication with each other, and by guiding the intermediate
pressure of the compression chambers 15 into the intermediate pressure region B in
this manner, it is possible to prevent the orbiting scroll 12 from separating from
the fixed scroll 11 and enhance the airtightness of the compression chambers 15 especially
under a low compression ratio condition.
[0055] Further, especially under the low compression ratio condition, if intermediate pressure
in mid-flow of compression of the compression chamber 15 becomes excessively high,
intermediate pressure in mid-flow of compression of the compression chamber 15 is
adjusted to predetermined pressure by opening the balance valve 73, and a compression
ratio of the low compression ratio condition at which the orbiting scroll 12 separates
from the fixed scroll 11 can be made small.
[0056] The orbiting scroll mirror plate 12a is provided with a first oil introduction hole
51 formed in the boss portion 12c, a first oil derivation hole 52 formed in an outer
periphery of the lap-side end surface, and a first mirror plate oil communication
path 53 which brings the first oil introduction hole 51 and the first oil derivation
hole 52 into communication with each other.
[0057] The orbiting scroll mirror plate 12a is provided with a second oil introduction hole
61 which opens from the intermediate pressure region B, a second oil derivation hole
62 which opens from a low pressure space of the compression chambers 15, and a second
mirror plate oil communication path 63 which brings the second oil introduction hole
61 and the second oil derivation hole 62 into communication with each other. The second
oil introduction hole 61 is formed in a side surface of the orbiting scroll mirror
plate 12a.
[0058] Figs. 3 are plane views of the fixed scroll and the orbiting scroll shown in Figs.
1 and 2.
[0059] Fig. 3(a) is a plane view of the fixed scroll of the embodiment as viewed from the
fixed spiral lap, and Fig. 3(b) is a plane view of the orbiting scroll of the embodiment
as viewed from the orbiting spiral lap.
[0060] In Fig. 3(a), the intermediate pressure region B is shown as a gray zone. As shown
in Fig. 3(a), the intermediate pressure region B is formed in the outer periphery
of the fixed spiral lap 11b. As shown in Fig. 4(a), a recess 11d is formed in a periphery
of an opening leading to the intermediate pressure region B of the peripheral wall-side
intermediate pressure communication path 42b.
[0061] The fixed scroll 11 is provided with a fixed scroll sliding surface 11e which slides
with respect to the orbiting scroll mirror plate 12a located closer to the outer periphery
than the orbiting spiral lap 12b shown in Fig. 3(b). The intermediate pressure region
B is formed closer to the outer periphery than the fixed scroll sliding surface 11e.
[0062] The fixed scroll sliding surface 11e is provided with a sliding surface groove 54
which is in communication with the intermediate pressure region B.
[0063] As shown in Fig. 3(b), the first oil derivation hole 52 and the second oil derivation
hole 62 open from the outer periphery of the lap-side end surface of the orbiting
scroll mirror plate 12a.
[0064] Figs. 4 are explanatory diagrams showing a supplying operation of lubricant oil existing
in a boss portion into the intermediate pressure region.
[0065] Fig. 4(a) is a plane view of a state where the orbiting scroll shown in Fig. 3(b)
meshes with the fixed scroll shown in Fig. 3(a). Fig. 4(b) is a plane view of the
orbiting scroll and the eccentric shaft in a state shown in Fig. 4(a). Fig. 4(c) is
an enlarged plane view of essential portions of Fig. 4 (a) .
[0066] As shown in Figs. 4, the first oil derivation hole 52 and the sliding surface groove
54 are in communication with each other in a rotation position where an eccentric
shaft center C of the eccentric shaft 13a comes closest to the sliding surface groove
54.
[0067] The eccentric shaft center C of the eccentric shaft 13a rotates around a rotation
shaft center D of the rotation shaft 13 like a locus E. The first oil derivation hole
52 rotates like a locus F in the same manner as the locus E of the eccentric shaft
center C.
[0068] Therefore, the first oil derivation hole 52 comes into communication with the sliding
surface groove 54 in the rotation position where the eccentric shaft center C of the
eccentric shaft 13a comes closest to the sliding surface groove 54, and the first
oil derivation hole 52 does not come into the communication in other positions.
[0069] The oil reservoir 80 is placed between the rotation shaft center D of the rotation
shaft 13 and the first oil introduction hole 51. By placing the oil reservoir 80 between
the rotation shaft center D of the rotation shaft 13 and the first oil introduction
hole 51 in this manner, lubricant oil which flows out from the oil reservoir 80 by
a centrifugal force is swiftly guided to the first oil introduction hole 51. Further,
since a centrifugal force acting from the oil reservoir 80 toward the first oil introduction
hole 51 is applied when the first oil derivation hole 52 comes into communication
with the sliding surface groove 54, sufficient lubricant oil flows into the first
mirror plate oil communication path 53.
[0070] As shown in Fig. 1, lubricant oil stored in the oil storage section 4 is introduced
into the boss portion 12c through the rotation shaft oil support hole 13c. The lubricant
oil introduced into the boss portion 12c is introduced into the sliding surface groove
54 through the first mirror plate oil communication path 53 as shown in Figs. 4, and
the lubricant oil introduced into the sliding surface groove 54 is intermittently
introduced into the intermediate pressure region B.
[0071] According to the scroll compressor of the embodiment, the high pressure region A
and the intermediate pressure region B are formed, and the orbiting scroll 12 is pushed
against the fixed scroll 11. Therefore, the lap-side end surface of the orbiting scroll
mirror plate 12a and the fixed scroll sliding surface 11e can maintain a close contact
state without separating from each other. Hence, an oil amount can be adjusted by
the first oil derivation hole 52 and the sliding surface groove 54, and it is easy
to adjust the oil amount.
[0072] According to the scroll compressor of the embodiment, the largest centrifugal force
is applied to lubricant oil existing in the boss portion 12c in the rotation position
where the eccentric shaft center C of the eccentric shaft 13a comes closest to the
sliding surface groove 54. Therefore, by bringing the first oil derivation hole 52
and the sliding surface groove 54 into communication with each other when the largest
centrifugal force is applied to lubricant oil existing in the boss portion 12c, it
is possible to reliably introduce the lubricant oil into the sliding surface groove
54.
[0073] Figs. 5 are explanatory diagrams showing a deriving operation of lubricant oil existing
in the intermediate pressure region into the compression chamber.
[0074] Fig. 5(a) is a plane view like Fig. 4(a) in which a position of the orbiting scroll
is different from that shown in Fig. 4(a), and Fig. 5(b) is an enlarged plane view
of essential portions of Fig. 5(a).
[0075] The second oil derivation hole 62 shown in Figs. 5 rotates like a locus G in the
same manner as the locus E of the eccentric shaft center C shown in Figs. 4.
[0076] In a state shown in Figs. 5, the second oil derivation hole 62 is in communication
with low pressure spaces of the compression chambers 15. Therefore, lubricant oil
existing in the intermediate pressure region B is introduced from the second oil introduction
hole 61, and is introduced from the second oil derivation hole 62 into the low pressure
spaces of the compression chambers 15 through the second mirror plate oil communication
path 63. In a state shown in the drawings other than Figs. 5, the second oil derivation
hole 62 is closed by the fixed scroll sliding surface 11e. Therefore, lubricant oil
existing in the intermediate pressure region B is intermittently introduced into the
low pressure spaces of the compression chambers 15.
[0077] According to the scroll compressor of the embodiment, lubricant oil in the intermediate
pressure region B can be circulated by introducing, into the low pressure spaces of
the compression chambers 15, the lubricant oil which is introduced into the intermediate
pressure region B, and it is possible to prevent oil from being deteriorated by shortage
of oil supply in the intermediate pressure region B and by accumulation of lubricant
oil.
[0078] Figs. 6 are explanatory diagrams showing a positional relation between a refueling
pathway and the sealing member associated with orbiting motion of the scroll compressor.
[0079] Figs. 6(a) show a state where the orbiting scroll 12 is meshed with the fixed scroll
11 and this is viewed from a back surface of the orbiting scroll 12. Fig. 6(b) shows
a state where Fig. 6(a) rotates 90 degrees, Fig. 6(c) shows a state where Fig. 6(b)
further rotates 90 degrees, and Fig. 6(d) shows a state where Fig. 6(c) further rotates
90 degrees.
[0080] As the compression chambers 15 formed by the fixed scroll 11 and the orbiting scroll
12, a first compression chamber 15A is formed on the side of an outer wall of the
orbiting spiral lap 12b, and a second compression chamber 15B is formed on the side
of an inner wall of the orbiting spiral lap 12b.
[0081] As shown in Figs. 6, by elongating an outer peripheral end 11be of the fixed spiral
lap 11b to the same length as an outer peripheral end 12be of the orbiting spiral
lap 12b in the state where the fixed scroll 11 and the orbiting scroll 12 mesh with
each other, a position where refrigerant in the first compression chambers 15A is
trapped and a position where refrigerant in the second compression chambers 15B is
trapped are deviated about 180 degrees from each other.
[0082] Fig. 6(a) shows a position where the refrigerant in the first compression chambers
15A is trapped, and Fig. 6(c) shows a position where refrigerant in the second compression
chambers 15B is trapped.
[0083] In the state shown in Fig. 6(a), three first compression chambers 15A (15A1, 15A2
and 15A3) are formed, the first compression chamber 15A1 located on an outermost periphery
is in a low pressure state immediately after refrigerant is trapped, the first compression
chamber 15A2 formed on the more inner peripheral side than the first compression chamber
15A1 is in an intermediate pressure state, and the first compression chamber 15A3
formed on the more inner peripheral side than the first compression chamber 15A2 is
in a high pressure state before discharge. In Fig. 6(a), symbols of the second compression
chambers 15B are omitted.
[0084] In the state shown in Fig. 6(c), three second compression chambers 15B (15B1, 15B2
and 15B3) are formed, the second compression chamber 15B1 located on the outermost
periphery is in a low pressure state immediately after refrigerant is trapped, the
second compression chamber 15B2 formed on the more inner peripheral side than the
second compression chamber 15B1 is in an intermediate pressure state, and the second
compression chamber 15B3 formed on the more inner peripheral side than the second
compression chamber 15B2 is in a high pressure state which is a discharge state.
[0085] The first compression chamber 15A1 shown in Fig. 6(a) has a suction volume of the
first compression chamber 15A, and the second compression chamber 15B1 shown in Fig.
6(c) has a suction volume of the second compression chamber 15B. By deviating a position
where refrigerant in the first compression chamber 15A is trapped and a position where
refrigerant in the second compression chamber 15B is trapped from each other 180 degrees,
the suction volume of the first compression chamber 15A is made larger than that of
the second compression chamber 15B.
[0086] The intermediate pressure extraction hole 41 opens from the first compression chamber
15A2 which is in the intermediate pressure state as shown in Fig. 6(a), and opens
from the second compression chamber 15B2 which is in the intermediate pressure state
as shown in Fig. 6(c). By placing the intermediate pressure extraction hole 41 at
a center between pitches of the fixed spiral lap 11b which is in the intermediate
pressure state, it is possible to uniformly open the intermediate pressure extraction
hole 41 from the first compression chamber 15A2 which is in the intermediate pressure
state and from the second compression chamber 15B2 which is in the intermediate pressure
state.
[0087] The second oil derivation hole 62 opens from the first compression chamber 15A1 which
is in the low pressure state at a position shown in Fig. 6(b).
[0088] As shown in Figs. 6, since a suction volume can be made maximum by deviating closing
timings of refrigerant between the first compression chamber 15A and the second compression
chamber 15B about 180 degrees, it is possible to set a lap height low.
[0089] Fig. 7 is a graph showing pressure variation of intermediate pressure which is taken
out from the intermediate pressure extraction hole in the scroll compressor of the
embodiment. Figs. 8 and 9 are graphs showing pressure variation of intermediate pressure
which is taken out from the intermediate pressure extraction hole in a scroll compressor
as a comparative example.
[0090] That is, Fig. 7 shows a pressure variation width of intermediate pressure which is
taken out from the intermediate pressure extraction hole when the fixed scroll is
provided with an intermediate pressure communication path in an asymmetric scroll
compressor in which a suction volume of a first compression chamber and a suction
volume of a second compression chamber are different from each other.
[0091] Fig. 8 shows a pressure variation width of intermediate pressure which is taken out
from the intermediate pressure extraction hole when the fixed scroll is provided with
an intermediate pressure communication path in an asymmetric scroll compressor in
which the suction volume of the first compression chamber and the suction volume of
the second compression chamber are different from each other.
[0092] Fig. 9 shows a pressure variation width of intermediate pressure which is taken out
from the intermediate pressure extraction hole when the fixed scroll or the orbiting
scroll is provided with the intermediate pressure communication path in a symmetric
scroll compressor in which the suction volume of the first compression chamber and
the suction volume of the second compression chamber are the same.
[0093] In Figs. 7 to 9, a horizontal axis shows a crank angle, and a vertical axis shows
pressure in the compression chamber.
[0094] In the drawings, a curve H shows pressure variation of the first compression chamber,
and a curve J shows pressure variation of the second compression chamber.
[0095] As shown in Fig. 7, by providing the fixed scroll with the intermediate pressure
extraction hole in the asymmetric scroll compressor in which the suction volume of
the first compression chamber and the suction volume of the second compression chamber
are different from each other, it is possible to make, small, a pressure variation
width of intermediate pressure which is taken out from the intermediate pressure extraction
hole as compared with a case where the orbiting scroll is provided with the intermediate
pressure extraction hole in the asymmetric scroll compressor shown in Fig. 8, and
as compared with a case where the orbiting scroll or the fixed scroll is provided
with the intermediate pressure extraction hole in the symmetric scroll compressor
shown in Fig. 9. Therefore, pulsation in an intermediate pressure region can be made
small, and it is possible to push the orbiting scroll against the fixed scroll stably.
[0096] As the refrigerant of the present invention, it is possible to use R32, carbon dioxide,
and refrigerant having carbon-carbon double bond.
[INDUSTRIAL APPLICABILITY]
[0097] The scroll compressor of the present invention is useful for a refrigeration cycle
device of a hot water heater, an air conditioner, a hot water supplying system, a
freezing machine and the like.
[EXPLANATION OF SYMBOLS]
[0098]
- 1
- hermetic container
- 2
- refrigerant suction pipe
- 3
- refrigerant discharge pipe
- 4
- oil storage section
- 5
- oil pump
- 6
- discharge chamber
- 10
- compressing mechanism
- 11
- fixed scroll
- 12
- orbiting scroll
- 13
- rotation shaft
- 13a
- eccentric shaft
- 13b
- lower end
- 13c
- rotation shaft oil support hole
- 13d
- orbiting bearing
- 13e
- oil groove
- 14
- discharge port
- 15
- compression chamber
- 15A
- first compression chamber
- 15B
- second compression chamber
- 16
- bolt
- 17
- rotation restraining member
- 18
- auxiliary bearing
- 20
- electric mechanism
- 21
- stator
- 22
- rotor
- 30
- main bearing
- 31
- bearing
- 32
- boss storing section
- 41
- intermediate pressure extraction hole
- 42
- intermediate pressure communication path
- 51
- first oil introduction hole
- 52
- first oil derivation hole
- 53
- first mirror plate oil communication path
- 61
- second oil introduction hole
- 62
- second oil derivation hole
- 63
- second mirror plate oil communication path
- 71
- high pressure communication path
- 72
- high pressure opening
- 73
- balance valve
- 80
- oil reservoir
1. A scroll compressor in which
a compressing mechanism for compressing refrigerant and an electric mechanism for
driving the compressing mechanism are placed in a hermetic container,
an oil storage section for storing lubricant oil therein is formed in a bottom of
the hermetic container,
the compressing mechanism includes a fixed scroll, an orbiting scroll and a rotation
shaft for driving the orbiting scroll in an orbiting manner,
the fixed scroll includes a disk-like fixed scroll mirror plate and a fixed spiral
lap standing on the fixed scroll mirror plate,
the orbiting scroll includes a disk-like orbiting scroll mirror plate, an orbiting
spiral lap standing on a lap-side end surface of the orbiting scroll mirror plate,
and a boss portion formed on an opposite side from the lap-side end surface of the
orbiting scroll mirror plate,
an eccentric shaft inserted into the boss portion is formed on an upper end of the
rotation shaft,
the fixed spiral lap and the orbiting spiral lap are meshed with each other, and a
plurality of compression chambers are formed between the fixed spiral lap and the
orbiting spiral lap,
a main bearing for supporting the fixed scroll and the orbiting scroll is provided
below the fixed scroll and the orbiting scroll,
a bearing for pivotally supproting the rotation shaft and a boss storing section for
storing the boss portion therein are formed in the main bearing,
a rotation restraining member for restraining rotation of the orbiting scroll is provided
between the fixed scroll and the main bearing,
a rotation shaft oil support hole extending from a lower end of the rotation shaft
to the eccentric shaft is formed in the rotation shaft, and
the orbiting scroll mirror plate is provided with a first oil introduction hole formed
in the boss portion, a first oil derivation hole formed in an outer periphery of the
lap-side end surface, and a first mirror plate oil communication path for bringing
the first oil introduction hole and the first oil derivation hole into communication
with each other, wherein
an oil reservoir is formed in an upper surface of the eccentric shaft, and
the oil reservoir is placed between a rotation shaft center of the rotation shaft
and the first oil introduction hole.
2. The scroll compressor according to claim 1, wherein
the boss storing section is a high pressure region, an outer periphery of the orbiting
scroll where the rotation restraining member is placed is an intermediate pressure
region, and the orbiting scroll is pushed against the fixed scroll,
the fixed scroll is provided with a fixed scroll sliding surface which slides with
respect to the orbiting scroll mirror plate located closer to an outer periphery of
the orbiting spiral lap than the orbiting spiral lap,
the intermediate pressure region is formed on a location closer to the outer periphery
of the orbiting spiral lap than the fixed scroll sliding surface,
the fixed scroll sliding surface is provided with a sliding surface groove which is
in communication with the intermediate pressure region,
the lubricant oil stored in the oil storage section is introduced into the boss portion
through the rotation shaft oil support hole,
the lubricant oil introduced into the boss portion is introduced into the sliding
surface groove through the first mirror plate oil communication path, and
the lubricant oil introduced into the sliding surface groove is introduced into the
intermediate pressure region.
3. The scroll compressor according to claim 2, wherein
the first oil derivation hole and the sliding surface groove are brought into communication
with each other at a rotation position where an eccentric shaft center of the eccentric
shaft comes closest to the sliding surface groove.
4. The scroll compressor according to any one of claims 1 to 3, wherein
as the compression chamber, a first compression chamber is formed on an outer wall
side of the orbiting spiral lap, and a second compression chamber is formed on an
inner wall side of the orbiting spiral lap,
a suction volume of the first compression chamber is made larger than a suction volume
of the second compression chamber,
the fixed scroll mirror plate is provided with an intermediate pressure extraction
hole through which intermediate pressure of the compression chamber is taken out,
and
an intermediate pressure communication path for bringing the intermediate pressure
extraction hole and the intermediate pressure region into communication with each
other is formed in the fixed scroll.
5. The scroll compressor according to claim 4, wherein
a high pressure communication path for bringing the intermediate pressure extraction
hole and a high pressure space in the hermetic container into communication with each
other is formed in the fixed scroll, and
a balance valve is providedin a high pressure opening of the high pressure communication
path.
6. The scroll compressor according to any one of claims 2 to 5, wherein
the orbiting scroll mirror plate is provided with a second oil introduction hole which
opens from the intermediate pressure region, a second oil derivation hole which opens
from a low pressure space of the compression chamber and a second mirror plate oil
communication path for bringing the second oil introduction hole and the second oil
derivation hole into communication with each other, and
the lubricant oil introduced into the intermediate pressure region is introduced in
to the low pressure space of the compression chamber through the second mirror plate
oil communication path.