WO2022064947A1

WO2022064947A1 - Scroll-type compressor

Info

Publication number: WO2022064947A1
Application number: PCT/JP2021/031305
Authority: WO
Inventors: 哲也今井; 泰造佐藤
Original assignee: サンデン・オートモーティブコンポーネント株式会社
Priority date: 2020-09-24
Filing date: 2021-08-26
Publication date: 2022-03-31
Also published as: US20230272798A1; JP2022052828A; CN116057278A; DE112021003672T5

Abstract

[Problem] To provide a scroll-type compressor with which it is possible to suppress insufficient lubrication of sliding portions of a scroll unit. [Solution] A scroll-type compressor 10 includes: an oil separator 100 which separates lubricating oil from a gaseous refrigerant discharged to a discharge chamber H3; a first lubricating oil chamber H5 which stores the lubricating oil separated by the oil separator 100; a first lubricating oil supply passage which supplies the lubricating oil in the first lubricating oil chamber H5 to a back pressure chamber H6; and a second lubricating oil supply passage which supplies the lubricating oil in the first lubricating oil chamber H5 to the vicinity of an outer end portion of a scroll unit 50. The second lubricating oil supply passage is formed as a passage causing the lubricating oil in the first lubricating oil chamber H5 to pass through a second lubricating oil chamber H7 which is disposed above the first lubricating oil chamber H5 and which is connected to the first lubricating oil chamber H5 by way of an orifice OL3.

Description

Scroll compressor

The present invention relates to a scroll type compressor used in a vehicle air conditioner or the like.

Patent Document 1 describes an example of this type of scroll type compressor. The scroll type compressor described in Patent Document 1 has a scroll unit having a fixed scroll and a swivel scroll, a discharge chamber for discharging the gaseous refrigerant compressed by the scroll unit, and the swivel scroll toward the fixed scroll. A back pressure chamber that exerts a back pressure to be pressed, an oil separator that separates lubricating oil from the gaseous refrigerant compressed by the scroll unit, and a back pressure supply that supplies the lubricating oil separated by the oil separator to the back pressure chamber. Has a passage.

Japanese Unexamined Patent Publication No. 2018-159285

In the conventional scroll type compressor, each sliding part is lubricated mainly by the lubricating oil contained in the gas refrigerant, but as the performance and miniaturization of the scroll type compressor progresses, the gas It becomes impossible to contain sufficient lubricating oil in the refrigerant, and there is a possibility that the lubrication of the sliding portion in the scroll unit becomes insufficient.

Therefore, an object of the present invention is to provide a scroll type compressor capable of suppressing insufficient lubrication of sliding portions in the scroll unit.

According to one aspect of the present invention, a scroll type compressor is provided. This scroll type compressor is configured such that a scroll unit having fixed scrolls and swivel scrolls facing each other is arranged in a housing, and the gaseous refrigerant compressed by the scroll unit is discharged to a discharge chamber in the housing. ing. Further, the scroll type compressor has an oil separator that separates lubricating oil from the gaseous refrigerant discharged to the discharge chamber, a first lubricating oil chamber that stores the lubricating oil separated by the oil separator, and the swivel scroll. A back pressure chamber provided on the back side of the above, a first lubricating oil supply passage for supplying lubricating oil in the first lubricating oil chamber to the back pressure chamber, and a scroll unit for lubricating oil in the first lubricating oil chamber. Includes a second lubricating oil supply passage, which is supplied in the vicinity of the outer end portion of the above. In the second lubricating oil supply passage, the lubricating oil in the first lubricating oil chamber is arranged above the first lubricating oil chamber and is connected to the first lubricating oil chamber via an orifice. It is formed as a passage through which the oil chamber passes.

According to the present invention, it is possible to provide a scroll type compressor capable of suppressing insufficient lubrication of sliding portions in the scroll unit.

It is sectional drawing which shows the schematic structure of the scroll type compressor which concerns on one Embodiment of this invention. FIG. 1 is a cross-sectional view taken along the line AA of FIG. It is a block diagram for demonstrating the flow of a gaseous refrigerant and a lubricating oil in the scroll type compressor.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a cross-sectional view showing a schematic configuration of a scroll type compressor 10 according to an embodiment of the present invention. The scroll type compressor 10 according to the embodiment is incorporated in a refrigerant circuit of a vehicle air conditioner or the like, is configured to receive a low-pressure gaseous refrigerant from the refrigerant circuit, compress the compressor, increase the pressure, and return the refrigerant circuit to the refrigerant circuit. .. The left side in FIG. 1 is the front side of the scroll compressor 10, the right side in FIG. 1 is the rear side of the scroll compressor 10, the upper side in FIG. 1 is the upper side of the scroll compressor 10, and the lower side in FIG. 1 is scroll. This is the lower side of the mold compressor 10.

The scroll type compressor 10 includes a housing 20, a rotary shaft 30, an electric motor 40 that rotates the rotary shaft 30, a scroll unit 50 that is driven by the rotary shaft 30 and compresses a (low pressure) gaseous refrigerant, and an electric motor. It has an inverter 60 that drives and controls 40. The rotary shaft 30, the electric motor 40, the scroll unit 50, and the inverter 60 are housed in the housing 20. Further, the scroll unit 50 includes a fixed scroll 51 and a swivel scroll 52 that swivels with respect to the fixed scroll 51.

The housing 20 includes a front housing 21, a cover member 22, a center housing 23, and a rear housing 24. Then, these are fastened by fasteners (not shown) or the like to form the housing 20 of the scroll type compressor 10.

The front housing 21 has a cylindrical peripheral wall portion (hereinafter referred to as "first peripheral wall portion") 211 extending in the front-rear direction and a partition wall portion (hereinafter referred to as "first partition wall portion") 212 for partitioning the inside of the first peripheral wall portion 211 in the front-rear direction. And have. The front end surface of the first peripheral wall portion 211 constitutes the front end surface of the front housing 21, and the rear end surface of the first peripheral wall portion 211 constitutes the rear end surface of the front housing 21. In the present embodiment, the inside of the first peripheral wall portion 211 (that is, the internal space of the front housing 21) is formed by the first partition wall portion 212 after accommodating the front inverter accommodating space accommodating the inverter 60 and the electric motor 40. It is partitioned from the motor accommodation space on the side. That is, the electric motor and the inverter 60 are housed in the front housing 21.

The first partition wall portion 212 is provided with a support portion 213 that supports the front end portion of the rotating shaft 30. Specifically, in the present embodiment, the support portion 213 is formed so as to project cylindrically from the rear surface of the first partition wall portion 212 into the motor accommodating space, and the first bearing 214 mounted therein is provided. It is configured to rotatably support the front end portion of the rotary shaft 30 via the rotary shaft 30.

A cover member 22 is joined to the front end surface of the front housing 21, whereby the inverter accommodating space is closed (an inverter accommodating chamber is formed). The front end surface of the center housing 23 is joined to the rear end surface of the front housing 21. A seal member may be arranged between the front housing 21 and the cover member 22 and between the front housing 21 and the center housing 23, if necessary.

The center housing 23 has a cylindrical peripheral wall portion (hereinafter referred to as "second peripheral wall portion") 231 extending in the front-rear direction and a partition wall portion (hereinafter referred to as "second partition wall portion") 232 that partitions the inside of the second peripheral wall portion 231 in the front-rear direction. And have. The front end surface of the second peripheral wall portion 231 constitutes the front end surface of the center housing 23, and the rear end surface of the second peripheral wall portion 231 constitutes the rear end surface of the center housing 23. In the present embodiment, the inside of the second peripheral wall portion 231 (that is, the internal space of the center housing 23) is a front connection space connected to the motor accommodation space of the front housing 21 by the second partition wall portion 232, and a scroll unit. It is partitioned into a scroll accommodation space on the rear side that accommodates 50. That is, the scroll unit 50 is housed in the center housing 23.

The second partition wall portion 232 has a hollow protruding portion 233 that protrudes toward the front housing 21 (motor accommodating space). The hollow protruding portion 233 is provided in the radial center of the second partition wall portion 232 so as to face the support portion 213 provided on the first partition wall portion 212 of the front housing 21. At the top of the hollow protrusion 233, an insertion hole 234 is formed in which the inside and outside of the hollow protrusion 233 are communicated with each other and the rear end side of the rotating shaft 30 is inserted. Further, inside the hollow protrusion 233, a second bearing 235 that rotatably supports the portion on the rear end side of the rotating shaft 30 is mounted. That is, in the present embodiment, the rotary shaft 30 is rotatably supported by the first bearing 214 provided on the front housing 21 side and the second bearing 235 provided on the center housing 23 side.

The front end surface of the rear housing 24 is joined to the rear end surface of the center housing 23. Here, in the present embodiment, the rear end surface of the center housing 23, that is, the rear end surface of the second peripheral wall portion 231 accommodates the outer edge portion of the fixed substrate 511 (described later) of the fixed scroll 51 constituting the scroll unit 50. A recess 236 is formed. Then, in the fixed scroll 51, the outer edge portion of the fixed substrate 511 is sandwiched between the center housing 23 and the rear housing 24, whereby the fixed scroll 51 is fixed and the opening on the rear side of the second peripheral wall portion 231 is fixed. It is blocked by the fixed substrate 511 of the scroll 51. A seal member may be arranged between the center housing 23 and the rear housing 24, if necessary.

The rear housing 24 is formed in a bottomed cylindrical shape, and has a bottom that closes a cylindrical peripheral wall portion (hereinafter referred to as "third peripheral wall portion") 241 extending in the front-rear direction and a rear opening of the third peripheral wall portion 241. It has a wall portion 242. Then, the front end surface of the third peripheral wall portion 241 constituting the front end surface of the rear housing 24 is joined to the rear end surface of the second peripheral wall portion 231 which is the rear end surface of the center housing 23, whereby the front side of the third peripheral wall portion 241 is joined. The opening of the fixed scroll 51 is closed by the fixed substrate 511 of the fixed scroll 51.

The electric motor 40 is composed of, for example, a three-phase AC motor, and includes a stator core unit 41 and a rotor 42.

The stator core unit 41 is fixed to the inner peripheral surface of the first peripheral wall portion 211 of the front housing 21. A direct current from an in-vehicle battery or the like (not shown) is converted into an alternating current by the inverter 60 and supplied to the stator core unit 41.

The rotor 42 is arranged with a predetermined gap inside the stator core unit 41 in the radial direction. A permanent magnet is incorporated in the rotor 42. The rotor 42 is formed in a cylindrical shape, and is fixed to the rotating shaft 30 with the rotating shaft 30 inserted through the hollow portion thereof. That is, the rotor 42 is integrated with the rotating shaft 30.

In the electric motor 40, when a magnetic field is generated in the stator core unit 41 by the power supply from the inverter 60, a rotational force acts on the permanent magnet of the rotor 42 to rotate the rotor 42, thereby rotating the rotating shaft 30.

As described above, the scroll unit 50 includes a fixed scroll 51 and a swivel scroll 52 that swivels with respect to the fixed scroll 51.

The fixed scroll 51 has a disk-shaped fixed substrate 511 and a fixed spiral wall 512 erected on one surface of the fixed substrate 511. The fixed spiral wall 512 has a spiral shape (involute curve shape) from the inner end portion (winding start portion) on the inner side in the radial direction to the outer end portion (winding end portion) on the outer side in the radial direction on one surface of the fixed substrate 511. It is extended. Then, in the fixed scroll 51, the outer edge portion of the fixed substrate 511 becomes the center housing 23 and the rear housing 24 in a state where one surface of the fixed substrate 511 (the surface on which the fixed spiral wall 512 is erected) faces forward. It is pinched and fixed.

The swivel scroll 52 has a disk-shaped swivel board 521 and a swirl swirl wall 522 erected on one surface of the swivel board 521. The swirl swirl wall 522 has a spiral shape (involute curve shape) from the inner end portion (winding start portion) on the inner side in the radial direction to the outer end portion (winding end portion) on the outer side in the radial direction on one surface of the swirl substrate 521. It extends along. The swirl scroll 52 is arranged so that the swirl wall 522 meshes with the fixed swirl wall 512 of the fixed scroll 51. That is, in the swivel scroll 52, one surface of the swivel substrate 521 (the surface on which the swirl swirl wall 522 is erected) faces rearward between the second partition wall portion 232 of the center housing 23 and the fixed scroll 51. It is arranged in a state.

The swivel scroll 52 is driven by a rotary shaft 30 via a crank mechanism 70, and is configured to revolve around the axis of the fixed scroll 51 so as to swivel with respect to the fixed scroll 51. .. The rotation scroll 52 is prevented from rotating by a rotation prevention mechanism (not shown).

The scroll unit 50 is configured such that the swivel scroll 52 swirls with respect to the fixed scroll 51 to take in and compress a low-pressure gaseous refrigerant. An annular plate-shaped thrust plate 80 is arranged between the swivel substrate 521 of the swivel scroll 52 and the second partition wall portion 232 of the center housing 23, and the rear surface of the second partition wall portion 232 is thrust. The thrust force from the swivel scroll 52 is received via the plate 80.

The crank mechanism 70 is configured to connect the rotary shaft 30 and the swivel scroll 52 and convert the rotary motion of the rotary shaft 30 into the swivel motion of the swivel scroll 52. In the present embodiment, the crank mechanism 70 is arranged inside the hollow protruding portion 233 of the second partition wall portion 232 of the center housing 23. The crank mechanism 70 includes a crank pin 71 erected at the rear end of the rotary shaft 30, an eccentric bush 72 attached eccentrically to the crank pin 71, and the other surface of the swivel substrate 521 of the swivel scroll 52. Includes a cylindrical portion 73 and a protrusion formed therein. The eccentric bush 72 is rotatably supported on the inner peripheral surface of the cylindrical portion 73 via a bearing (not shown). A balancer weight 74 that opposes the centrifugal force generated by the turning motion of the turning scroll 52 is attached to the rear end portion of the rotating shaft 30.

In the present embodiment, the scroll type compressor 10 has a suction chamber H1 into which a low-pressure gas refrigerant flows, a compression chamber H2 for compressing the low-pressure gas refrigerant, and a discharge for discharging the gas refrigerant compressed in the compression chamber H2. The chamber H3, the gas-liquid separation chamber H4 for separating the lubricating oil from the gaseous refrigerant compressed in the compression chamber H2, the first lubricating oil chamber H5, and the back side of the swirling scroll 52 (the other surface side of the swirling substrate 521). ), It has a back pressure chamber H6 and a second lubricating oil chamber H7. FIG. 2 is a cross-sectional view taken along the line AA of FIG. In FIG. 2, for convenience of explanation, the range of the discharge chamber H3 is shown by a two-dot chain line.

The suction chamber H1 is partitioned by a first peripheral wall portion 211 of the front housing 21, a first partition wall portion 212 of the front housing 21, a second peripheral wall portion 231 of the center housing 23, and a second partition wall portion 232 of the center housing 23. .. That is, in the present embodiment, the suction chamber H1 is formed by the motor accommodating space of the front housing 21 and the connection section of the center housing 23. A suction port P1 is formed on the first peripheral wall portion 211. The suction port P1 is connected to (the low pressure side) of the refrigerant circuit via a connection pipe (not shown) or the like. Therefore, the low-pressure refrigerant from the refrigerant circuit flows into the suction chamber H1 through the suction port P1. Further, the center housing 23 is formed with a refrigerant passage L1 for guiding the low-pressure gaseous refrigerant in the suction chamber H1 to the space H8 near the outer end of the scroll unit 50.

The compression chamber H2 is formed in the scroll unit 50, that is, between the fixed scroll 51 and the swivel scroll 52. Specifically, in the scroll unit 50, when the swivel scroll 52 swivels with respect to the fixed scroll 51, a crescent-shaped sealed space is radially formed by the fixed substrate 511, the fixed swirl wall 512, the swirl substrate 521, and the swirl swirl wall 522. The crescent-shaped enclosed space formed on the outside moves inward in the radial direction while gradually reducing the volume. A crescent-shaped closed space formed between the fixed scroll 51 and the swivel scroll 52 constitutes the compression chamber H2. The scroll unit 50 is configured to compress the low-pressure gas refrigerant by taking in the low-pressure gas refrigerant from the space H8 when the crescent-shaped closed space (that is, the compression chamber H2) is formed.

The discharge chamber H3 is formed by a third peripheral wall portion 241 of the rear housing 24, a bottom wall portion 242 of the rear housing 24, and a fixed substrate 511 of the fixed scroll 51. That is, the inside of the third peripheral wall portion 241 of the rear housing 24 constitutes the discharge chamber H3. At the center of the fixed substrate 511 of the fixed scroll 51 in the radial direction, a discharge hole L2 that communicates the compression chamber H2 that has moved inward (the smallest volume) and the discharge chamber H3 is formed. Therefore, the gas refrigerant compressed in the compression chamber H2 of the scroll unit 50 is discharged to the discharge chamber H3 through the discharge hole L2. The other surface of the fixed substrate 511 of the fixed scroll 51 facing the discharge chamber H3 allows the flow of the gas refrigerant from the compression chamber H2 to the discharge chamber H3, but the gas from the discharge chamber H3 to the compression chamber H2. A check valve 90 consisting of, for example, a reed valve, which regulates the flow of the refrigerant, is attached.

The gas-liquid separation chamber H4 is provided in the rear housing 24. Specifically, in the present embodiment, the gas-liquid separation chamber H4 is formed as a columnar space in which the bottom wall portion 242 of the rear housing 24 extends downward from the outer peripheral surface toward the inside. In the gas-liquid separation chamber H4, an oil separator 100 for separating the lubricating oil contained in the gaseous refrigerant is arranged. Here, a centrifugal oil separator is used, but the oil separator is not limited to this, and other oil separators may be used. A discharge port P2 is provided above the oil separator 100 in the gas-liquid separation chamber H4. The discharge port P2 is connected to (the high pressure side) of the refrigerant circuit via a connection pipe (not shown) or the like. Further, a communication hole L3 that communicates the discharge chamber H3 and the gas-liquid separation chamber H4 is formed in the bottom wall portion 242 of the rear housing 24.

Therefore, the gas refrigerant in the discharge chamber H3, that is, the gas refrigerant compressed in the compression chamber H2 (high-pressure gas refrigerant) flows into the gas-liquid separation chamber H4 through the communication hole L3 and is lubricated by the oil separator 100. The oil is separated and then led out from the discharge port P2 to the high pressure side of the refrigerant circuit. On the other hand, the lubricating oil separated from the high-pressure gas refrigerant by the oil separator 100 is guided to the lower part of the gas-liquid separation chamber H4 by gravity.

The first lubricating oil chamber H5 is provided in the rear housing 24. Specifically, in the present embodiment, in the first lubricating oil chamber H5, the recess (opening) formed in the front end surface of the third peripheral wall portion 241 of the rear housing 24 is closed by the fixed substrate 511 of the fixed scroll 51. Is formed. That is, the first lubricating oil chamber H5 is formed by the fixed scroll 51 and the rear housing 24. The first lubricating oil chamber H5 is formed below the discharge chamber H3. Further, the rear housing 24 is formed with a connection passage L4 connecting the lower portion of the gas-liquid separation chamber H4 and the first lubricating oil chamber H5.

Therefore, in the gas-liquid separation chamber H4, the lubricating oil separated from the high-pressure gas refrigerant by the oil separator 100 (including the lubricating oil temporarily stored in the lower part of the gas-liquid separation chamber H4) passes through the connection passage L4. It flows through the first lubricating oil chamber H5 and is stored in the first lubricating oil chamber H5.

The back pressure chamber H6 is formed between the swivel substrate 521 of the swivel scroll 52 and the second partition wall portion 232 of the center housing 23. In the present embodiment, the back pressure chamber H6 includes the internal space of the hollow protrusion 233 of the second partition wall portion 232. A lubricating oil passage L5 connecting the back pressure chamber H6 and the first lubricating oil chamber H5 is formed in the fixed substrate 511 of the center housing 23 and the fixed scroll 51. A first orifice (first throttle portion) OL1 is arranged in the middle of the lubricating oil passage L5.

Further, the back pressure chamber H6 communicates with the suction chamber H1 via the pressure release passage L6. In the present embodiment, the pressure release passage L6 is formed as a passage that penetrates the rotating shaft 30 in the axial direction and passes through the first bearing 214. A second orifice (second throttle portion) OL2 is arranged in the middle of the pressure release passage L6, for example, at the front end portion of the rotating shaft 30.

The second lubricating oil chamber H7 is provided in the rear housing 24 in the same manner as the first lubricating oil chamber H5. Specifically, in the present embodiment, in the second lubricating oil chamber H7, the recess (opening) formed in the front end surface of the third peripheral wall portion 241 of the rear housing 24 is closed by the fixed substrate 511 of the fixed scroll 51. Is formed. That is, similarly to the first lubricating oil chamber H5, the second lubricating oil chamber H7 is formed by the fixed scroll 51 and the rear housing 24. Further, the second lubricating oil chamber H7 is arranged above the first lubricating oil chamber H5 and is formed on the radial outer side of the discharge chamber H3 so as to surround the discharge chamber H3 (see FIG. 2).

The second lubricating oil chamber H7 is connected to the first lubricating oil chamber H5 via the third orifice (third throttle portion) OL3. In the present embodiment, the third orifice OL3 is a groove formed on the front end surface of the third peripheral wall portion 241 of the rear housing 24, specifically, the peripheral end portion of the first lubricating oil chamber H5 and the second lubrication. The narrow and / or shallow bottom groove connecting the peripheral end of the oil chamber H7 is closed by the fixed substrate 511 of the fixed scroll 51. That is, similarly to the first lubricating oil chamber H5 and the second lubricating oil chamber H7, the third orifice OL3 is formed by the fixed scroll 51 and the rear housing 24. Further, the first lubricating oil chamber H5 and the second lubricating oil chamber H7 are connected in series in the circumferential direction via the third orifice OL3.

Further, on the fixed substrate 511 of the fixed scroll 51, lubricating oil is applied to the space H8 in the vicinity of the outer end portion of the scroll unit 50, and more specifically, in the vicinity of the outer end portion (winding end portion) of the swirling swirl wall 522 of the swirling scroll 52. A lubricating oil return hole L7 for returning is formed. In the present embodiment, the lubricating oil return hole L7 is provided above the discharge hole L2. Further, the lubricating oil return hole L7 has one end opened in the other surface of the fixed substrate 511 and communicates with the second lubricating oil chamber H7, and the other end is a swirl scroll in the one surface of the fixed substrate 511. It is open to the portion corresponding to the winding end portion of the swirling spiral wall 522 of 52.

Next, the flow of the gaseous refrigerant and the lubricating oil in the scroll type compressor 10 will be described with reference to FIGS. 1 and 3. FIG. 3 is a block diagram for explaining the flow of the gaseous refrigerant and the lubricating oil in the scroll type compressor 10. In FIG. 1, the flow of the gaseous refrigerant before the lubricating oil is mixed or after the lubricating oil is separated is indicated by a diagonal arrow, and the flow of the gaseous refrigerant containing the lubricating oil is indicated by a black arrow. , The flow of lubricating oil separated from the gaseous refrigerant is indicated by the white arrow.

As shown in FIGS. 1 and 3, the low-pressure gaseous refrigerant from the refrigerant circuit flows into the suction chamber H1 through the suction port P1, and then the outer end portion of the scroll unit 50 via the refrigerant passage L1. It is guided to the nearby space H8. The low-pressure gas refrigerant guided to the space H8 is taken into the compression chamber H2 of the scroll unit 50 and compressed as the swivel scroll 52 swivels. The gas refrigerant (high pressure gas refrigerant) compressed in the compression chamber H2 is discharged to the discharge chamber H3 through the discharge hole L2 (and the check valve 90), and then is discharged to the discharge chamber H3 through the communication hole L3. Inflow to. The lubricating oil contained in the gas refrigerant flowing into the gas-liquid separation chamber H4 is separated by the oil separator 100. Then, the gaseous refrigerant from which the lubricating oil is separated by the oil separator 100 is led out from the discharge port P2 to the refrigerant circuit. On the other hand, the lubricating oil separated from the gaseous refrigerant by the oil separator 100 flows from the lower part of the gas-liquid separation chamber H4 through the connection passage L4 and is stored in the first lubricating oil chamber H5.

The first lubricating oil chamber H5 communicates with the discharge chamber H3 via the connection passage L4, the gas-liquid separation chamber H4, and the communication hole L3. Further, the first lubricating oil chamber H5 communicates with the back pressure chamber H6 via the lubricating oil passage L5, and the back pressure chamber H6 communicates with the suction chamber H1 via the discharge pressure passage L6.

Therefore, (a part of) the lubricating oil stored in the first lubricating oil chamber H5 passes through the lubricating oil passage L5 and is supplied to the back pressure chamber H6. Therefore, in the present embodiment, the lubricating oil passage L5 constitutes the "first lubricating oil supply passage" of the present invention. Here, the first orifice OL1 is arranged in the middle of the lubricating oil passage L5. Therefore, the pressure of the lubricating oil stored in the first lubricating oil chamber H5 is reduced from the pressure Pd of the discharge chamber H3 and supplied to the back pressure chamber H6. Further, a second orifice OL2 is arranged in the middle of the pressure release passage L6. Therefore, the flow rate of the lubricating oil (and / or the gaseous refrigerant) from the back pressure chamber H6 to the suction chamber H1 is limited. As a result, the pressure of the back pressure chamber H6 is maintained at the intermediate pressure (back pressure) Pm between the pressure Ps of the suction chamber H1 and the pressure Pd of the discharge chamber H3, and the turning scroll 52 is maintained by this intermediate pressure (back pressure) Pm. Is pressed toward the fixed scroll 51. That is, the back pressure chamber H6 causes the back pressure Pm pressed toward the fixed scroll 51 to act on the swivel scroll 52.

Further, the first lubricating oil chamber H5 communicates with the space H8 near the outer end portion of the scroll unit 50 via the third orifice OL3, the second lubricating oil chamber H7, and the lubricating oil return hole L7. The pressure in this space H8 is the same as the pressure Ps in the suction chamber H1.

Therefore, (a part of) the lubricating oil stored in the first lubricating oil chamber H5 passes through the third orifice OL3, the second lubricating oil chamber H7, and the lubricating oil return hole L7, and is near the outer side of the scroll unit 50. Is supplied to. Therefore, in the present embodiment, the passage formed by the third orifice OL3, the second lubricating oil chamber H7, and the lubricating oil return hole L7 constitutes the "second lubricating oil supply passage" of the present invention. The lubricating oil stored in the first lubricating oil chamber H5 is depressurized by passing through the third orifice OL3 (and the second lubricating oil chamber H7) and is supplied to the vicinity of the outer portion of the scroll unit 50. A part of the lubricating oil stored in the first lubricating oil chamber H5 is stored in the second lubricating oil chamber H7, but the lubricating oil stored in the second lubricating oil chamber H7 is also outside the scroll unit 50. It is supplied in the vicinity of the unit.

As described above, the scroll type compressor 10 according to the embodiment stores the lubricating oil separated from the gaseous refrigerant by the oil separator 100 in the first lubricating oil chamber H5, and the lubricating oil in the first lubricating oil chamber H5 ( The second lubricating oil chamber H7 is arranged above the first lubricating oil chamber H5 and connected to the first lubricating oil chamber H5 via the third orifice OL3, and the fixed substrate of the fixed scroll 51. It is configured to pass through the lubricating oil return hole L7 formed in 511 and supply the oil to the vicinity of the outer end portion of the scroll unit 50. That is, the scroll type compressor 10 is configured to guide the lubricating oil in the first lubricating oil chamber H5 upward while reducing the pressure and supply it to the vicinity of the outer end portion of the scroll unit 50. Therefore, an appropriate amount of lubricating oil can be stably contained in the gaseous refrigerant taken in by the scroll unit 50, and insufficient lubrication of the sliding portion in the scroll unit is suppressed.

In particular, the lubricating oil return hole L7 has one end opened in the other surface of the fixed substrate 511 to communicate with the second lubricating oil chamber H7, and the other end is swirled in the one surface of the fixed substrate 511. The scroll 52 is open at a portion corresponding to the winding end portion of the swirling swirl wall 522. Therefore, it becomes possible to supply the lubricating oil to the place where the compression chamber H2 is formed and surely include the lubricating oil in the gaseous refrigerant taken in by the scroll unit 50, and the insufficient lubrication of the sliding portion in the scroll unit is more effective. Is suppressed.

Further, the second lubricating oil chamber H7 is formed on the radial outer side of the discharge chamber H3 so as to surround the discharge chamber H3, and the first lubricating oil chamber H5 and the second lubricating oil chamber H7 have a third orifice OL3. They are connected in series in the circumferential direction via. Further, the first lubricating oil chamber H5, the second lubricating oil chamber H7, and the third orifice OL3 are formed by the fixed scroll 51 (fixed substrate 511) and the rear housing 24. Therefore, a function of depressurizing a part of the lubricating oil in the first lubricating oil chamber H5 and supplying it to the vicinity of the outer portion of the scroll unit 50 without increasing the size of the scroll type compressor 10 and increasing the number of parts. Further, a function of depressurizing a part of the lubricating oil in the first lubricating oil chamber H5 and supplying it to the winding end portion of the swirling swirl wall 522 of the swirling scroll 52 can be realized.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and it is needless to say that the present invention can be modified and modified based on the technical idea of the present invention.

10 ... scroll type compressor, 20 ... housing, 21 ... front housing, 23 ... center housing, 24 ... rear housing (housing member), 50 ... scroll unit, 51 ... fixed scroll, 52 ... swivel scroll, 100 ... oil separator, 511 ... Fixed substrate, 512 ... Fixed swirl wall, 521 ... Swirling substrate, 522 ... Swirling swirl wall, H1 ... Suction chamber, H2 ... Compression chamber, H3 ... Discharge chamber, H4 ... Gas-liquid separation chamber, H5 ... First lubricating oil Chamber, H6 ... back pressure chamber, H7 ... second lubricating oil chamber, L1 ... refrigerant passage, L2 ... discharge hole, L3 ... communication hole, L4 ... connection passage, L5 ... lubricating oil passage (first lubricating oil supply passage), L6 ... Pressure discharge passage, L7 ... Lubricating oil return hole, OL1-3 ... orifice

Claims

A scroll type compressor in which scroll units having fixed scrolls and swivel scrolls facing each other are arranged in a housing, and the gaseous refrigerant compressed by the scroll unit is discharged to a discharge chamber in the housing. hand,
An oil separator that separates the lubricating oil from the gaseous refrigerant discharged into the discharge chamber,
A first lubricating oil chamber for storing the lubricating oil separated by the oil separator, and
The back pressure chamber provided on the back side of the swivel scroll and
A first lubricating oil supply passage for supplying the lubricating oil in the first lubricating oil chamber to the back pressure chamber,
A second lubricating oil supply passage for supplying the lubricating oil in the first lubricating oil chamber to the vicinity of the outer end portion of the scroll unit, and
Including
In the second lubricating oil supply passage, the lubricating oil in the first lubricating oil chamber is arranged above the first lubricating oil chamber and is connected to the first lubricating oil chamber via an orifice. Formed as a passage through the oil chamber,
Scroll compressor.
The second lubricating oil supply passage is a passage through which the lubricating oil that has passed through the second lubricating oil chamber or the lubricating oil stored in the second lubricating oil chamber passes through the lubricating oil return hole formed in the fixed scroll. The scroll type compressor according to claim 1, which is formed as.
The scroll type compressor according to claim 2, wherein the lubricating oil return hole is provided above the discharge hole in which the gaseous refrigerant compressed by the scroll unit is discharged to the discharge chamber.
The fixed scroll has a fixed substrate and a fixed swirl wall erected on one surface of the fixed substrate, and the swirl scroll has a swirl swirl erected on one surface of the swivel substrate and the swirl substrate. It has a wall, and the fixed scroll and the swivel scroll are arranged so that the fixed swirl wall and the swirl swirl wall mesh with each other.
One end of the lubricating oil return hole opens in the other surface of the fixed substrate and communicates with the second lubricating oil chamber, and the other end of the lubricating oil return hole is said in the one surface of the fixed substrate. Opening at the part corresponding to the winding end of the swirling wall,
The scroll type compressor according to claim 2 or 3.
The scroll type compressor according to any one of claims 1 to 4, wherein the second lubricating oil chamber is formed on the radial outer side of the discharge chamber so as to surround the discharge chamber.
The scroll type compressor according to claim 5, wherein the first lubricating oil chamber and the second lubricating oil chamber are connected in series in the circumferential direction via the orifice.
The scroll according to any one of claims 1 to 6, wherein the first lubricating oil chamber, the second lubricating oil chamber, and the orifice are formed by the fixed scroll and the housing member constituting the housing. Mold compressor.