CN113330218A - Scroll compressor having a discharge port - Google Patents

Abstract

A first oil drain groove (81) and a second oil drain groove (82) are formed on the opposite surface of the fixed scroll (60). A part of the first oil drain groove (81) and the second oil drain groove (82) is opened at a position radially outside the sliding range of the movable scroll (70). The first oil drain groove (81) and the second oil drain groove (82) communicate with a suction port (64) of the compression chamber (S) via an oil recovery passage (90).

Description

Scroll compressor having a discharge port

Technical Field

The present disclosure relates to a scroll compressor.

Background

Patent document 1 discloses a scroll compressor configured to perform: a first operation in which only the stationary-side oil groove and the movable-side oil groove communicate with each other among the stationary-side oil groove, the movable-side oil groove, and the compression chamber (fluid chamber); and a second operation in which the movable-side oil groove is simultaneously communicated with both the stationary-side oil groove and the compression chamber after the first operation.

Documents of the prior art

Patent document

Patent document 1: japanese laid-open patent publication No. 2016-160816

Disclosure of Invention

Technical problems to be solved by the invention

In the invention of patent document 1, the moving-side oil groove communicates with the space of the compression chamber on the radially outer side of the orbiting scroll, and therefore it is difficult to supply oil to the space of the compression chamber on the radially inner side of the orbiting scroll.

The purpose of the present disclosure is: oil can be supplied to a space on the radially inner side and the radially outer side of the orbiting scroll in the compression chamber.

Technical solution for solving technical problem

A first aspect of the present disclosure is directed to a scroll compressor including: a casing 20, a first scroll 60 received in the casing 20, and a second scroll 70 forming a compression chamber S with the first scroll 60, the scroll compressor comprising: oil discharge portions 81, 82 formed on the opposite surface of the first scroll 60 opposite to the second scroll 70; and an oil recovery path 90 that communicates the oil drains 81 and 82 with the suction port 64 of the compression chamber S.

In the first aspect, oil discharge portions 81 and 82 are formed on the opposing surface of the first scroll 60. The oil drains 81 and 82 communicate with the suction port 64 of the compression chamber S via the oil recovery passage 90.

Thus, oil can be supplied to the space inside and outside the orbiting scroll in the radial direction in the compression chamber S.

A second aspect of the present disclosure is based on the first aspect, and a part of the oil drain portions 81 and 82 is opened at a position on the opposite surface of the first scroll 60 that is more radially outward than the relative sliding range of the second scroll 70.

In the second aspect, a part of the oil drain portions 81, 82 is opened at a position radially outward of the relative sliding range of the second scroll 70, and therefore the oil drain portions 81, 82 are not entirely blocked by the second scroll 70.

A third aspect of the present disclosure is the scroll compressor of the first or second aspect, including: an oil supply unit 80 formed on the opposite surface of the first scroll 60 at a position radially inward of the oil discharge units 81 and 82; and an intermittent communication mechanism 87 that intermittently communicates the oil supply portion 80 with the oil drain portions 81 and 82.

In the third aspect, since the fueling portion 80 and the drain portions 81 and 82 are intermittently communicated by the intermittent communication mechanism 87, the discharge of the oil from the fueling portion 80 to the drain portions 81 and 82 is intermittently stopped. This can prevent excessive oil from being discharged to the drain portions 81 and 82.

A fourth aspect of the present disclosure is the third aspect, wherein the intermittent communication mechanism 87 is constituted by oil delivery portions 85 and 86 formed on the opposite surface of the second scroll 70 to the first scroll 60.

In the fourth aspect, the intermittent communication mechanism 87 is constituted by the oil delivery portions 85, 86 formed on the opposed face of the second scroll 70. Thus, by forming the groove-like oil delivery portions 85 and 86 on the opposing surface of the second scroll 70, the second scroll 70 can rotate relative to the first scroll 60, and the oil feeder 80 and the oil discharge portions 81 and 82 can be intermittently communicated with each other.

A fifth aspect of the present disclosure is the fourth aspect, wherein the oil delivery portions 85, 86 are formed in plurality at intervals in the circumferential direction.

In the fifth aspect, a plurality of oil delivery portions 85, 86 are formed with intervals in the circumferential direction. As described above, if a plurality of oil delivery portions 85, 86 are formed and the single oil delivery portion 85, 86 has a shape that is broken in the middle, the oil supply portion 80 and the oil discharge portions 81, 82 are not continuously connected by the oil delivery portions 85, 86. This can prevent excessive oil from being discharged to the drain portions 81 and 82.

A sixth aspect of the present disclosure is the first to fifth aspects, wherein a partition space 23 partitioned by the housing 20 and the fixing member 50 and communicating with the oil discharge portions 81 and 82 is provided in the housing 20, a suction pipe 12 is provided upstream of the suction port 64, a predetermined gap is provided between the suction pipe 12 and the suction port 64, an opening 67 communicating with the partition space 23 is provided, and the oil recovery passage 90 is constituted by the partition space 23 and the opening 67.

In the sixth aspect, a partition space 23 communicating with the oil drain portions 81, 82 is provided inside the casing 20. An opening 67 communicating with the partition space 23 is provided between the suction port 64 and the suction pipe 12. The oil recovery passage 90 is constituted by the partitioned space 23 and the opening 67.

Thus, the high-temperature oil collected in the oil drain portions 81 and 82 releases heat and cools while passing through the partitioned space 23, and therefore, the oil can be prevented from being supplied to the suction port 64 while being kept at a high temperature.

A seventh aspect of the present disclosure is the first to sixth aspects, wherein a plurality of the oil discharge portions 81 and 82 are formed on the opposing surface of the first scroll 60.

In the seventh aspect, by forming the plurality of oil drain portions 81, 82 on the opposing surface of the first scroll 60, it is possible to recover oil from a plurality of positions in the circumferential direction of the first scroll 60.

An eighth aspect of the present disclosure is the seventh aspect, wherein the plurality of oil discharge portions 81 and 82 are formed at positions opposing to each other with the axial center of the first scroll 60 interposed therebetween.

In the eighth aspect, the oil can be recovered from a plurality of positions spaced apart from each other in the circumferential direction of the first scroll 60 by forming the plurality of oil discharge portions 81 and 82 at positions opposing each other across the axial center of the first scroll 60.

A ninth aspect of the present disclosure is based on any one of the first to eighth aspects, the first scroll 60 is a fixed scroll 60, and the second scroll 70 is a movable scroll 70.

In the ninth aspect, the first scroll 60 is constituted by the fixed scroll 60. Further, the movable scroll 70 constitutes a second scroll 70.

Drawings

Fig. 1 is a longitudinal sectional view showing a structure of a scroll compressor according to the present embodiment;

fig. 2 is a bottom view showing the structure of the fixed scroll;

fig. 3 is a plan view showing the structure of the orbiting scroll;

fig. 4 is a longitudinal sectional view showing a main portion of the scroll compressor enlarged;

fig. 5 is a diagram showing a positional relationship of the oil supply groove, the oil drain groove, and the oil delivery groove at the time of the first operation;

fig. 6 is a diagram showing a positional relationship of the oil supply groove, the oil drain groove, and the oil delivery groove at the time of the second operation;

fig. 7 is a diagram showing a positional relationship of the oil supply groove, the oil drain groove, and the oil delivery groove when the third operation is performed;

fig. 8 is a diagram showing a positional relationship of the oil supply groove, the oil drain groove, and the oil delivery groove in the fourth operation.

Detailed Description

(embodiment mode)

The embodiments will be explained.

As shown in fig. 1, a scroll compressor 10 is provided in a refrigerant circuit that performs a vapor compression refrigeration cycle. In the refrigerant circuit, the refrigerant compressed by the scroll compressor 10 is condensed by the condenser, reduced in pressure by the pressure reducing mechanism, evaporated in the evaporator, and sucked into the scroll compressor 10.

The scroll compressor 10 includes: a housing 20, and a motor 30 and a compression mechanism 40 housed in the housing 20. The housing 20 is formed in a cylindrical shape having a long longitudinal length and is configured as a closed dome-type housing.

The motor 30 includes: a stator 31 fixed to the casing 20, and a rotor 32 disposed inside the stator 31. The rotor 32 is fixed to the drive shaft 11.

An oil reservoir 21 for storing oil is formed at the bottom of the casing 20. A suction pipe 12 is connected to an upper portion of the casing 20. A discharge pipe 13 is connected to the center of the casing 20.

A fixing member 50 is fixed to the housing 20. The fixing member 50 is disposed above the motor 30. A compression mechanism 40 is disposed above the fixed member 50. The inflow end of the discharge pipe 13 is positioned between the motor 30 and the fixing member 50.

The drive shaft 11 extends in the vertical direction along the center axis of the housing 20. The drive shaft 11 includes a main shaft portion 14 and an eccentric portion 15 connected to an upper end of the main shaft portion 14.

The lower portion of the main shaft 14 is rotatably supported by a lower bearing 22 provided in the housing 20. The lower bearing 22 is fixed to the inner circumferential surface of the housing 20. The upper portion of the main shaft portion 14 extends through the fixing member 50, and is rotatably supported by an upper bearing 51 of the fixing member 50.

The compression mechanism 40 includes a fixed scroll 60 (first scroll) and a movable scroll 70 (second scroll). The fixed scroll 60 is fixed to an upper surface of the fixed member 50. The orbiting scroll 70 is disposed between the fixed scroll 60 and the fixed member 50.

The fixing member 50 is formed with an annular portion 52 and a recess 53. The annular portion 52 is provided on the outer peripheral portion of the fixing member 50. The recess 53 is formed in the central upper portion of the fixing member 50, and the recess 53 is formed in a dish shape with its central portion depressed. An upper bearing 51 is provided below the recess 53.

The fixing member 50 is fixed inside the housing 20 by press fitting. The inner peripheral surface of the housing 20 and the outer peripheral surface of the annular portion 52 of the fixing member 50 are kept in close contact with each other in an airtight manner over the entire circumference. The fixing member 50 partitions the internal space of the casing 20 into an upper space 23 (partitioned space) and a lower space 24, the compression mechanism 40 is accommodated in the upper space 23, and the motor 30 is accommodated in the lower space 24.

The fixed scroll 60 includes: the stationary-side end plate 61, a substantially cylindrical outer peripheral wall 63 provided upright on an outer edge of a lower surface of the stationary-side end plate 61, and a spiral stationary wrap 62 (see fig. 2) provided upright inside the outer peripheral wall 63 of the stationary-side end plate 61.

The stationary-side end plate 61 is located on the outer peripheral side and is formed next to the stationary wrap 62. The tip end surface of the fixed wrap 62 is formed substantially flush with the tip end surface of the outer peripheral wall 63. The fixed scroll 60 is fixed to the fixed member 50.

The orbiting scroll 70 includes: a movable-side end plate 71, a spiral movable-side lap 72 formed on the upper surface of the movable-side end plate 71, and a flange 73 (see fig. 3) formed at the center of the lower surface of the movable-side end plate 71.

The eccentric portion 15 of the drive shaft 11 is inserted into the flange portion 73 so that the drive shaft 11 is coupled to the flange portion 73. An oldham coupling 46 is provided at an upper portion of the fixed member 50. The oldham coupling 46 prevents the orbiting scroll 70 from spinning.

In the compression mechanism 40, a compression chamber S into which a refrigerant flows is formed between the fixed scroll 60 and the orbiting scroll 70. The orbiting scroll 70 is provided with: the orbiting scroll 72 meshes with the fixed scroll 62 of the fixed scroll 60. Here, the lower surface of the outer peripheral wall 63 of the fixed scroll 60 is an opposing surface facing the orbiting scroll 70. The upper surface of the movable-side end plate 71 of the movable scroll 70 is an opposing surface to the fixed scroll 60.

A suction port 64 communicating with the compression chamber S is formed in the outer peripheral wall 63 of the fixed scroll 60. The suction pipe 12 is disposed upstream of the suction port 64, and a predetermined gap is provided between the suction pipe 12 and the suction port 64. Thus, an opening 67 communicating with the upper space 23 is provided on the upstream side of the suction port 64.

Compression chamber S is divided into an outer chamber S1 located radially outward of orbiting scroll 70 and an inner chamber S2 located radially inward of orbiting scroll 70. Specifically, when the inner peripheral surface of the outer peripheral wall 63 of the fixed scroll 60 substantially contacts the outer peripheral surface of the orbiting wrap 72 of the orbiting scroll 70, the outer chamber S1 and the inner chamber S2 are defined by the contact portions (see, for example, fig. 5).

A discharge port 65 is formed in the center of the stationary end plate 61 of the fixed scroll 60. A high-pressure chamber 66 is formed in an upper surface of the stationary-side end plate 61 of the fixed scroll 60, and the discharge port 65 is opened toward the high-pressure chamber 66. The high-pressure chamber 66 communicates with the lower space 24 via a passage (not shown) formed in the fixed member 50 and the fixed end plate 61 of the fixed scroll 60. The high-pressure refrigerant compressed by the compression mechanism 40 flows toward the lower space 24.

An oil supply hole 16 is formed in the drive shaft 11 so as to extend vertically from the lower end of the drive shaft 11 to the upper end. The lower end portion of the drive shaft 11 is immersed in the oil reservoir 21. The oil supply hole 16 supplies the oil in the oil reservoir 21 to the lower bearing 22 and the upper bearing 51 and also supplies the oil to the gap between the flange 73 and the drive shaft 11. The oil supply hole 16 opens at the upper end surface of the drive shaft 11, and supplies oil to the upper side of the drive shaft 11.

The recess 53 of the fixed member 50 communicates with the oil supply hole 16 in the drive shaft 11 via the inside of the flange portion 73 of the orbiting scroll 70. By supplying the high-pressure oil to the concave portion 53, a high-pressure corresponding to the discharge pressure of the compression mechanism 40 acts on the concave portion 53. The orbiting scroll 70 is pressed against the fixed scroll 60 by the high-pressure force of the recess 53.

An oil passage 55 is formed inside the fixed member 50 and the fixed scroll 60. The inflow end of the oil passage 55 communicates with the recess 53 of the fixed member 50. The outflow end of the oil passage 55 is open on the opposite face of the fixed scroll 60. The oil passage 55 supplies the high-pressure oil in the recess 53 to the opposing surface between the movable-side end plate 71 of the movable scroll 70 and the outer circumferential wall 63 of the fixed scroll 60.

< Structure of oil supply groove, oil discharge groove and oil supply groove >

As shown in fig. 2, an oil supply groove 80 (oil supply portion), a first oil drain groove 81, and a second oil drain groove 82 (oil drain portion) are formed on the opposite surface of the outer peripheral wall 63 of the fixed scroll 60.

The oil supply groove 80 is formed in the outer peripheral wall 63 of the fixed scroll 60 on the opposite surface to the movable-side end plate 71 of the movable scroll 70. The oil supply groove 80 extends in a substantially arc shape along the inner peripheral surface of the outer peripheral wall 63 of the fixed scroll 60. The oil supply groove 80 communicates with the oil passage 55, and oil is supplied from the oil passage 55 to the oil supply groove 80.

The first oil discharge groove 81 is formed at a position radially outward of the oil supply groove 80. The first oil drain groove 81 is located on the upper side in fig. 2. The first oil discharge groove 81 has a first groove portion 81a extending in the circumferential direction and a second groove portion 81b extending radially outward from the circumferential center portion of the first groove portion 81 a. The second groove portion 81b opens at a position radially outward of the sliding range of the orbiting scroll 70. Thus, the second groove 81b of the first oil discharge groove 81 is not blocked by the passive scroll 70.

The second oil discharge groove 82 is formed at a position radially outward of the oil supply groove 80. The second oil drain groove 82 is formed at a position (lower side in fig. 2) opposing the first oil drain groove 81 across the axial center of the fixed scroll 60.

The second oil drain groove 82 is formed by a curved groove extending in the circumferential direction. A portion of second oil discharge groove 82 is opened at a position more radially outward than the sliding range of orbiting scroll 70.

As shown in fig. 3, a first oil supply groove 85 and a second oil supply groove 86 (oil supply portion) are formed on the opposite surface of the movable-side end plate 71 of the movable scroll 70.

The first oil supply groove 85 is formed on the opposite surface of the orbiting scroll 70 at a position close to the first oil discharge groove 81. Two first oil sumps 85 are provided at intervals in the circumferential direction.

The second oil supply groove 86 is formed near the second oil drain groove 82, and faces the first oil supply groove 85 across the axial center of the fixed scroll 60. Two second oil sumps 86 are provided at intervals in the circumferential direction.

As the orbiting scroll 70 eccentrically rotates, the first oil supply groove 85 is switched between a state of communicating with the oil supply groove 80 and a state of communicating with the first oil discharge groove 81. As the movable scroll 70 eccentrically rotates, the second oil supply groove 86 is switched between a state of communicating with the oil supply groove 80 and a state of communicating with the second oil discharge groove 82. As described above, the first oil supply groove 85 and the second oil supply groove 86 constitute the intermittent communication mechanism 87, and the intermittent communication mechanism 87 intermittently communicates the oil supply groove 80 with the first oil drain groove 81 and the second oil drain groove 82.

The first oil drain groove 81 communicates with the upper space 23 via the cutout portion 68 (upper side in fig. 2) of the fixed scroll 60. The second oil drain groove 82 communicates with the upper space 23 via the cutout portion 68 (lower side in fig. 2) of the fixed scroll 60. Further, the suction port 64 of the compression chamber S communicates with the upper space 23 via the opening 67.

Therefore, as indicated by the arrow lines in fig. 4, the oil collected in the first oil drain groove 81 and the second oil drain groove 82 is supplied to the suction port 64 through the upper space 23 and the opening 67. As described above, the upper space 23 and the opening 67 constitute the oil recovery path 90, and the oil recovery path 90 communicates the first oil drain groove 81 and the second oil drain groove 82 with the suction port 64 of the compression chamber S.

Then, the compression mechanism 40 performs four operations of supplying the high-pressure oil in the oil supply tank 80 to a predetermined portion. That is, in the compression mechanism 40, while the orbiting scroll 70 is eccentrically rotated, the first operation, the second operation, the third operation, the fourth operation, the first operation, and the second operation … … are sequentially repeated.

-operation actions-

The basic operation of the scroll compressor 10 will be described. When the motor 30 is operated, the orbiting scroll 70 of the compression mechanism 40 is driven to rotate. Since the oldham coupling 46 prevents the orbiting scroll 70 from rotating on its own axis, the orbiting scroll 70 eccentrically rotates only about the axial center of the drive shaft 11.

As shown in fig. 5 to 8, when the orbiting scroll 70 eccentrically revolves, the compression chamber S is partitioned into an outer chamber S1 and an inner chamber S2. A plurality of inside chambers S2 are formed between the fixed wrap 62 of the fixed scroll 60 and the orbiting wrap 72 of the orbiting scroll 70. When the orbiting scroll 70 eccentrically rotates, the inner chamber S2 gradually approaches the center (the discharge port 65), and the volume of the inner chamber S2 is gradually reduced. Thereby, the refrigerant is compressed in the inner compartment S2.

When the inner side chamber S2, which has reached the minimum volume, communicates with the discharge port 65, the high-pressure gaseous refrigerant in the inner side chamber S2 is discharged into the high-pressure chamber 66 through the discharge port 65. The high-pressure refrigerant gas in the high-pressure chamber 66 flows into the lower space 24 through the passages formed in the fixed scroll 60 and the fixed member 50. The high-pressure gaseous refrigerant in the lower space 24 is ejected toward the outside of the casing 20 via the ejection pipe 13.

Oil supply action

Next, the oil supply operation in the scroll compressor 10 will be described in detail with reference to fig. 4 to 8.

When the high-pressure gaseous refrigerant flows into the lower space 24 of the scroll compressor 10, the lower space 24 is in a high-pressure environment, and the oil in the oil sump 21 is also in a high-pressure state. The high-pressure oil in the oil reservoir 21 flows upward in the oil supply hole 16 in the drive shaft 11, and flows from the upper end opening of the eccentric portion 15 of the drive shaft 11 to the inside of the flange portion 73 of the orbiting scroll 70.

The oil supplied to the flange portion 73 is supplied to a gap between the eccentric portion 15 of the drive shaft 11 and the flange portion 73. Thus, the recess 53 of the fixing member 50 is in a high-pressure environment corresponding to the discharge pressure of the compression mechanism 40. The orbiting scroll 70 is pressed against the fixed scroll 60 by the high-pressure force of the recess 53.

The high-pressure oil stored in the recess 53 flows through the oil passage 55 and flows to the oil supply groove 80. Thereby, high-pressure oil corresponding to the discharge pressure of the compression mechanism 40 is supplied to the oil supply groove 80. In this state, when the orbiting scroll 70 eccentrically rotates, the first operation, the second operation, the third operation, and the fourth operation are sequentially performed. In all of the above operations, the oil in the oil supply groove 80 is used to lubricate the opposing surfaces around the oil supply groove.

< first action >

When the orbiting scroll 70 is located at the eccentric angle position of fig. 5, for example, the first action is performed. In the first operation, the oil supply groove 80 communicates with the first oil supply groove 85, and the first oil supply groove 85 is filled with high-pressure oil. The second oil drain groove 82 communicates with the second oil sump 86, and the oil received in the second oil sump 86 flows to the second oil drain groove 82. The oil that has flowed into the second oil drain groove 82 is supplied to the suction port 64 through the oil recovery path 90. The oil supplied to the suction port 64 is distributed to the outer chamber S1 located radially outward of the orbiting scroll 72 of the orbiting scroll 70 and the inner chamber S2 located radially inward of the orbiting scroll 72. This improves the oil tightness of the outer compartment S1 and the inner compartment S2.

< second action >

When the movable scroll 70 located at the eccentric angular position of fig. 5 is further eccentrically rotated to be located at, for example, the eccentric angular position of fig. 6, the second operation is performed. In the second action, the first oil supply groove 85 moves away from the oil supply groove 80 toward the first oil drain groove 81. Further, the second oil supply groove 86 moves away from the second oil discharge groove 82 toward the oil supply groove 80.

At this time, the first oil supply groove 85 is provided in two in the circumferential direction, and thus the first oil supply groove 85 is in a shape of being broken at a middle portion. Therefore, for example, even when the movable scroll 70 is displaced and one of the first oil sumps 85 communicates with the oil supply groove 80 and the other first oil sumps 85 communicates with the first oil discharge groove 81, the oil in the oil supply groove 80 can be prevented from leaking to the first oil sumps 85. Further, since two second oil delivery grooves 86 are also provided in the circumferential direction, the same effect can be obtained.

< third action >

When the movable scroll 70 located at the eccentric angular position of fig. 6 is further eccentrically rotated to be located at, for example, the eccentric angular position of fig. 7, the third operation is performed. In the third mode, the oil supply groove 80 communicates with the second oil supply groove 86, and the second oil supply groove 86 is filled with the high-pressure oil.

Further, first oil drain groove 81 communicates with first oil supply groove 85, and the oil received in first oil supply groove 85 flows to first oil drain groove 81. The oil that has flowed into the first oil drain groove 81 is supplied to the suction port 64 through the oil recovery path 90. The oil supplied to the suction port 64 is distributed to the outer chamber S1 located radially outward of the orbiting scroll 72 of the orbiting scroll 70 and the inner chamber S2 located radially inward of the orbiting scroll 72.

< fourth action >

When the movable scroll 70 located at the eccentric angular position of fig. 7 is further eccentrically rotated to be located at, for example, the eccentric angular position of fig. 8, the fourth operation is performed. In the fourth action, the first oil supply groove 85 moves away from the first oil discharge groove 81 toward the oil supply groove 80. Further, the second oil supply groove 86 moves away from the oil supply groove 80 toward the second oil discharge groove 82.

After the fourth operation, the first operation is performed again, and then the second operation, the third operation, and the fourth operation are sequentially repeated.

Effects of the embodiment

The scroll compressor 10 of the present embodiment includes: the scroll compressor includes a casing 20, a fixed scroll 60 (first scroll) housed in the casing 20, and a movable scroll 70 (second scroll) forming a compression chamber S with the fixed scroll 60. Also, the scroll compressor 10 includes: the first oil drain groove 81 and the second oil drain groove 82 (oil drain portions) formed on the opposite surface of the fixed scroll 60 to the orbiting scroll 70, and the oil recovery passage 90 that communicates the first oil drain groove 81 and the second oil drain groove 82 with the suction port 64 of the compression chamber S.

In the present embodiment, the first oil drain groove 81 and the second oil drain groove 82 are formed on the opposite surfaces of the fixed scroll 60. The first oil drain groove 81 and the second oil drain groove 82 communicate with the suction port 64 of the compression chamber S through the oil recovery passage 90.

Thus, oil can be supplied to the space inside and outside the orbiting scroll 70 in the radial direction in the compression chamber S.

Specifically, the orbiting scroll 70 relatively rotates with respect to the fixed scroll 60, and the oil supplied to the opposite surface of the fixed scroll 60 flows radially outward, and is collected in the first oil drain groove 81 and the second oil drain groove 82. Since the oil collected in the first oil drain groove 81 and the second oil drain groove 82 is supplied to the suction port 64 through the oil recovery passage 90, the oil is distributed to the spaces inside and outside the orbiting scroll 70 in the radial direction in the compression chamber S. This improves the oil tightness of the inner space and the outer space.

In the scroll compressor 10 of the present embodiment, a part of the first oil drain groove 81 and the second oil drain groove 82 is opened at a position on the opposite surface of the fixed scroll 60 radially outward of the relative sliding range of the orbiting scroll 70.

In the present embodiment, since the first oil drain groove 81 and the second oil drain groove 82 are partially open at positions radially outward of the relative sliding range of the orbiting scroll 70, the first oil drain groove 81 and the second oil drain groove 82 are not entirely closed by the orbiting scroll 70. This can suppress the occurrence of the oil supply to the suction port 64 being stopped.

The scroll compressor 10 of the present embodiment includes: an oil supply groove 80 (oil supply portion) formed on the opposite surface of the fixed scroll 60 at a position radially inward of the first oil discharge groove 81 and the second oil discharge groove 82, and an intermittent communication mechanism 87 that intermittently communicates the oil supply groove 80 with the first oil discharge groove 81 and the second oil discharge groove 82.

In the present embodiment, since the oil supply portion 80 and the first oil drain groove 81 and the second oil drain groove 82 are intermittently communicated by the intermittent communication mechanism 87, the oil discharge from the oil supply portion 80 to the first oil drain groove 81 and the second oil drain groove 82 is intermittently stopped. In this way, it is possible to suppress excessive oil from being discharged to the first oil drain groove 81 and the second oil drain groove 82.

In the scroll compressor 10 of the present embodiment, the intermittent communication mechanism 87 is constituted by the first oil sump 85 and the second oil sump 86 (oil supply portion) formed on the opposite surface of the orbiting scroll 70 to the fixed scroll 60.

In the present embodiment, the intermittent communication mechanism 87 is constituted by the first oil receiving groove 85 and the second oil receiving groove 86 formed on the opposite surfaces of the orbiting scroll 70. As described above, by forming the first oil sumps 85 and the second oil sumps 86 in the groove shape on the opposed surface of the orbiting scroll 70, the oil supply portion 80 can be intermittently communicated with the first oil drain groove 81 and the second oil drain groove 82 by relative rotation of the orbiting scroll 70 with respect to the fixed scroll 60.

In the scroll compressor 10 of the present embodiment, a plurality of first oil sumps 85 and a plurality of second oil sumps 86 are formed with intervals in the circumferential direction.

In the present embodiment, a plurality of first oil sumps 85 and a plurality of second oil sumps 86 are formed with intervals in the circumferential direction. As described above, if the first oil supply groove 85 and the second oil supply groove 86 are formed in plurality, that is, the single first oil supply groove 85 and the single second oil supply groove 86 have a shape of being interrupted halfway, the oil supply portion 80 and the first oil drain groove 81 are not continuously connected by the first oil supply groove 85, and the oil supply portion 80 and the second oil drain groove 82 are not continuously connected by the second oil supply groove 86. In this way, it is possible to suppress excessive oil from being discharged to the first oil drain groove 81 and the second oil drain groove 82.

In the scroll compressor 10 of the present embodiment, the upper space 23 (partitioned space) partitioned by the casing 20 and the fixed member 50 and communicating with the first oil drain groove 81 and the second oil drain groove 82 is provided inside the casing 20, the suction pipe 12 is provided on the upstream side of the suction port 64, the opening 67 communicating with the upper space 23 is provided by a predetermined gap between the suction pipe 12 and the suction port 64, and the oil recovery path 90 is constituted by the upper space 23 and the opening 67.

In the present embodiment, an upper space 23 communicating with the first oil drain groove 81 and the second oil drain groove 82 is provided inside the casing 20. An opening 67 communicating with the upper space 23 is provided between the suction port 64 and the suction pipe 12. The oil recovery passage 90 is constituted by the upper space 23 and the opening 67.

Thus, the high-temperature oil collected in the first oil drain groove 81 and the second oil drain groove 82 radiates heat and is cooled while passing through the upper space 23, and therefore, the oil can be prevented from being supplied to the suction port 64 while being kept at a high temperature.

In the scroll compressor 10 of the present embodiment, a plurality of oil drain grooves 81 and 82 are formed on the opposite surface of the fixed scroll 60.

In the present embodiment, the plurality of oil drain grooves 81 and 82 are formed in the opposing surface of the fixed scroll 60, whereby oil can be collected from a plurality of positions in the circumferential direction of the fixed scroll 60.

In the scroll compressor 10 of the present embodiment, the plurality of oil drain grooves 81 and 82 are formed at positions opposing each other across the axial center of the fixed scroll 60.

In the present embodiment, the plurality of oil drain grooves 81 and 82 are formed at positions opposing each other across the axial center of the fixed scroll 60, whereby oil can be recovered from positions spaced apart from each other in the circumferential direction of the fixed scroll 60.

In the scroll compressor 10 of the present embodiment, the first scroll 60 is a fixed scroll 60, and the second scroll 70 is a movable scroll 70.

In the present embodiment, the fixed scroll 60 constitutes the first scroll 60. Further, the movable scroll 70 constitutes a second scroll 70.

(other embodiments)

The above embodiment may have the following configuration.

In the present embodiment, a configuration has been described in which the oil supply groove 80, the first oil drain groove 81, and the second oil drain groove 82 are formed in the opposing surface of the fixed scroll 60, and the first oil supply groove 85 and the second oil supply groove 86 are formed in the opposing surface of the orbiting scroll 70, but the present invention is not limited to this configuration. For example, the oil supply groove 80, the first oil drain groove 81, and the second oil drain groove 82 may be formed on the facing surface of the orbiting scroll 70, and the first oil sump 85 and the second oil sump 86 may be formed on the facing surface of the fixed scroll 60.

While the embodiments and the modifications have been described above, it is to be understood that various changes in the form and the specific structure may be made without departing from the spirit and scope of the claims. Further, the above embodiments and modifications may be combined or substituted as appropriate as long as the functions of the objects of the present disclosure are not affected.

Industrial applicability-

In summary, the present disclosure is useful for scroll compressors.

-description of symbols-

10 scroll compressor

12 suction pipe

20 casing

23 Upper space (separation space)

50 fixing member

60 static vortex plate (first vortex plate)

64 suction inlet

67 opening

70 dynamic scroll (second scroll)

80 oil supply groove (oil supply part)

81 first oil drain groove (oil drain part)

82 second oil discharge groove (oil discharge part)

85 first oil-transfer groove (oil-transfer part)

86 second oil transfer groove (oil transfer part)

87 intermittent communication mechanism

90 oil recovery way

S compression chamber

Claims (9)

1. A scroll compressor including a casing (20), a first scroll (60) received in the casing (20), and a second scroll (70) forming a compression chamber (S) with the first scroll (60), characterized in that:

the scroll compressor includes:

oil drain portions (81, 82), the oil drain portions (81, 82) being formed on an opposing surface of the first scroll (60) opposing the second scroll (70); and

and an oil recovery path (90) that communicates the oil discharge unit (81, 82) with a suction port (64) of the compression chamber (S) in the oil recovery path (90).

2. The scroll compressor of claim 1, wherein:

a part of the oil drain portion (81, 82) is opened at a position on the opposite surface of the first scroll (60) which is more radially outward than the relative sliding range of the second scroll (70).

3. The scroll compressor of claim 1 or 2, wherein:

the scroll compressor includes:

an oil supply unit (80) formed on the opposing surface of the first scroll (60) at a position radially inward of the oil discharge units (81, 82); and

an intermittent communication mechanism (87), the intermittent communication mechanism (87) intermittently communicating the oil supply portion (80) and the oil drain portions (81, 82).

4. The scroll compressor of claim 3, wherein:

the intermittent communication mechanism (87) is configured by oil transfer sections (85, 86) formed on the opposite surface of the second scroll (70) to the first scroll (60).

5. The scroll compressor of claim 4, wherein:

the oil delivery parts (85, 86) are formed in plurality at intervals in the circumferential direction.

6. The scroll compressor of any one of claims 1 to 5, wherein:

a partition space (23) partitioned by the housing (20) and a fixing member (50) and communicating with the oil discharge parts (81, 82) is provided inside the housing (20),

a suction pipe (12) is arranged on the upstream side of the suction port (64), a predetermined gap is formed between the suction pipe (12) and the suction port (64), and an opening (67) communicating with the partition space (23) is provided,

the oil recovery path (90) is configured by the partition space (23) and the opening (67).

7. The scroll compressor of any one of claims 1 to 6, wherein:

the plurality of oil discharge portions (81, 82) are formed on the opposing surface of the first scroll (60).

8. The scroll compressor of claim 7, wherein:

the plurality of oil discharge portions (81, 82) are formed at positions opposing each other with the axial center of the first scroll (60) therebetween.

9. The scroll compressor of any one of claims 1 to 8, wherein:

the first scroll (60) is a fixed scroll (60),

the second scroll (70) is a moving scroll (70).

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