JP2010031759A - Vane compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vane compressor preventing lubricating oil from accumulating in a delivery space, reducing delivery pulsation by preventing volume reduction of the delivery space, and preventing reduction of the quantity of lubricating oil supplied for sliding of a sliding part. <P>SOLUTION: The delivery space Da and a delivery chamber 30 in which pressure is lower than pressure in the delivery space Da are formed, an oil separator 40 is joined to a rear side plate 15, in a housing H of the vane compressor 10. A delivery passage 15e connecting the delivery space Da and a delivery chamber 30 is formed at the rear side plate 15. The vane compressor 10 includes an oil return passage 45 connecting the delivery space Da and the delivery passage 15e. A communication passage 41a communicating to the delivery passage 15e is formed at the oil separator 40. Lubricating oil in the delivery space Da can be returned to a delivery chamber 30 by the oil return passage 45. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a vane compressor in which a compression chamber is formed in a cylinder block by a vane.

  For example, as disclosed in Patent Document 1, in a vane compressor, a cylinder block is accommodated in a housing, and side plates are joined to both axial ends of the cylinder block. Further, a rotor having a plurality of vanes is rotatably accommodated inside the cylinder block, and an operating chamber (compression chamber) is formed in the cylinder block by these vanes. A refrigerant gas discharge space compressed in the working chamber is defined between the outer peripheral surface of the cylinder block, the inner peripheral surface of the housing facing the outer peripheral surface, and one side surface of both side plates. Further, the cylinder block is formed with a discharge port that communicates the internal compression chamber and the external discharge space.

  Further, an oil storage chamber (discharge chamber) is defined between the other side surface of the rear side plate and the inner surface of the housing, and oil separation for separating lubricating oil contained in the refrigerant gas is provided in the oil storage chamber. A vessel is provided. This oil separator includes an oil separation chamber formed in the case, and an oil separation cylinder provided in an upper portion of the oil separation chamber.

In addition, a discharge passage that connects the discharge space and the oil storage chamber is formed in the rear side plate, and the discharge space and the oil separator communicate with each other through the discharge passage. The mist-like lubricating oil contained in the refrigerant gas is supplied from the discharge space to the oil separator through the discharge passage, and is separated by the oil separator. Further, the lubricating oil separated from the refrigerant gas is dropped from the oil separation chamber and stored in the oil storage chamber. The lubricating oil stored in the oil storage chamber is supplied to each sliding portion such as a sliding surface between the rotor and the side plate and a sliding surface between the rotor and the vane.
Japanese Patent Laid-Open No. 7-12072

  By the way, when the lubricating oil contained in the refrigerant gas is discharged from the working chamber into the discharge space, the lubricating oil is separated from the refrigerant gas in the discharge space by colliding with the inner peripheral surface of the housing, and the lubricating oil is discharged into the discharge space. It will accumulate inside. When the lubricating oil is stored in the discharge space, the volume of the discharge space, which has a large effect of reducing the discharge pulsation, decreases, and abnormal noise due to the discharge pulsation of the vane compressor increases. Moreover, if lubricating oil accumulates in discharge space, the amount of lubricating oil used for lubrication of each sliding part in a vane compressor will reduce.

  The present invention has been made paying attention to such problems existing in the prior art, and its purpose is to prevent the lubricating oil from accumulating in the discharge space and prevent the volume of the discharge space from decreasing. An object of the present invention is to provide a vane compressor capable of reducing discharge pulsation and preventing reduction in the amount of lubricating oil supplied for sliding of a sliding portion.

  In order to solve the above problems, a cylindrical cylinder block is accommodated in the housing, and a rotor having a vane is rotatably accommodated in the cylinder block. A plate is joined, and a compression chamber is formed in the cylinder block by the vane. The outer peripheral surface of the cylinder block, the inner peripheral surface of the housing facing the outer peripheral surface, and the cylinder in both side plates A space surrounded by one end surface facing the block is partitioned with a discharge space for refrigerant gas compressed in the compression chamber, and further, between the other end surface of one side plate and the inner surface of the housing. Has a discharge chamber into which the refrigerant gas is discharged from the discharge space, and the one side plate has a discharge chamber. A vane compressor in which a discharge passage that connects the discharge space and the discharge chamber is formed, and includes an oil return passage that connects the discharge space and a low-pressure portion having a lower pressure than the discharge space below the discharge passage. The lubricating oil in the discharge space is returned to the low pressure portion by the oil return passage based on the differential pressure between the discharge space and the low pressure portion.

  According to this, when the refrigerant gas is discharged from the compression chamber to the discharge space, even if the lubricating oil is separated from the refrigerant gas in the discharge space, the lubricating oil in the discharge space is removed by the differential pressure between the discharge space and the low pressure portion. It can be returned to the low pressure part via the oil return passage. Therefore, it is possible to prevent the lubricating oil from accumulating in the discharge space and to prevent the volume of the discharge space from being reduced. Therefore, the buffering action of the discharge pulsation by the discharge space can be exhibited and the discharge pulsation can be reduced. Moreover, it can prevent that the amount of lubricating oil which flows through the inside of a vane compressor falls by storing lubricating oil in discharge space.

  The low pressure part may be the discharge chamber. According to this, the discharge chamber is located downstream of the discharge space in the refrigerant gas flow direction. For this reason, for example, compared with the case where the oil return passage is communicated with a low pressure portion (for example, a compression chamber) located upstream of the discharge space in the refrigerant gas flow direction, the passage sectional area of the oil return passage is increased. can do. In addition, when the oil return passage is communicated with a low pressure portion (for example, a compression chamber) located upstream of the discharge space in the refrigerant gas flow direction, if no lubricant is stored in the discharge space, the refrigerant in the discharge space The gas flows into the compression chamber and is recompressed. Therefore, the refrigerant gas is not recompressed because the oil return passage communicates with the discharge chamber on the downstream side in the flow direction.

  The oil return passage may have one end communicating with the discharge space and the other end communicating with the discharge passage. According to this, the refrigerant gas discharged from the discharge space flows into the discharge passage. For this reason, by connecting the oil return passage to the discharge passage, the lubricating oil can be put on the refrigerant gas flowing from the discharge passage to the discharge chamber, and the lubricating oil can be returned to the discharge chamber together with the refrigerant gas.

  An oil separator that separates lubricating oil from the refrigerant gas is joined to the other end surface of the one side plate, and the oil separator is provided in the discharge chamber. A communication passage communicating with the discharge passage may be formed.

  According to this, the lubricating oil returned from the oil return passage to the discharge passage flows into the communication passage together with the refrigerant gas, and is then supplied to the oil separator. Then, the refrigerant gas and the lubricating oil are separated by the oil separator. For this reason, the lubricating oil in the discharge space is returned to the discharge chamber together with the refrigerant gas, and then reliably separated from the refrigerant gas by the oil separator.

  The oil return passage includes an oil return hole formed in the side plate so that one end communicates with the discharge space, and the other end of the oil return hole and the discharge passage in the side plate. You may form from the oil return groove recessedly provided in the other end surface.

  According to this, it is possible to prevent the lubricating oil from being stored in the discharge space with a simple configuration in which only one member forming the discharge chamber and the discharge space is processed in the vane compressor such as the side plate.

  According to the present invention, it is possible to prevent the lubricating oil from accumulating in the discharge space, to prevent the volume of the discharge space from decreasing, and to reduce the discharge pulsation, and the amount of lubricant supplied for sliding of the sliding portion Can be prevented.

  Hereinafter, an embodiment of a vane compressor embodying the present invention will be described with reference to FIGS. In the following description, “front” and “rear” of the vane compressor are the directions of the arrow Y1 shown in FIG. 1, and “upper” and “lower” are the directions of the arrow Y2 shown in FIG. The vertical direction.

  As shown in FIG. 1, the housing H of the vane compressor 10 is formed of a rear housing 11 and a front housing 12 joined to a front end surface (one end surface) of the rear housing 11. A cylindrical cylinder block 13 is accommodated in the rear housing 11 (housing H). The inner peripheral surface of the cylinder block 13 is formed in an elliptical shape (see FIG. 2).

  Further, inside the rear housing 11 (housing H), a front side plate 14 serving as a side plate is joined to the front end surface (one end surface) of the cylinder block 13, and the rear end surface (other end surface) of the cylinder block 13. The rear side plate 15 as a side plate is joined. The outer peripheral surface of the cylinder block 13, the inner peripheral surface of the rear housing 11 (housing H) facing the outer peripheral surface, and the first end surface that is one end surface facing the cylinder block 13 in the front side plate 14 and the rear side plate 15. A discharge space Da is defined between the end surfaces 14a and 15a.

  A rotating shaft 17 is rotatably supported by the front side plate 14 and the rear side plate 15, and the rotating shaft 17 passes through the cylinder block 13. In the cylinder block 13, a cylindrical rotor 18 is fixed to the rotary shaft 17 so as to be integrally rotatable with the rotary shaft 17. As shown in FIG. 2, on the outer circumferential surface of the rotor 18, vane grooves 18a are formed radially at a plurality of locations, and vanes 20 are accommodated in the respective vane grooves 18a so as to be able to appear and retract. Lubricating oil is supplied to each vane groove 18a.

  When the tip surface of the vane 20 comes into contact with the inner peripheral surface of the cylinder block 13 due to the rotation of the rotor 18 accompanying the rotation of the rotating shaft 17, the outer peripheral surface of the rotor 18 and the inner peripheral surface of the cylinder block 13 are adjacent to each other. A compression chamber 21 is defined between the front side plate 14 and the rear side plate 15. In the vane compressor 10, a stroke in which the compression chamber 21 increases in volume with respect to the rotation direction of the rotor 18 is a suction stroke, and a stroke in which the compression chamber 21 decreases in volume is a compression stroke.

  As shown in FIG. 1, in the vane compressor 10, a suction port 24 is formed in the upper part of the front housing 12, and a suction space Sa communicating with the suction port 24 is formed in the front housing 12. Yes. Further, the front side plate 14 is formed with a suction port 14b communicating with the suction space Sa. Further, the cylinder block 13 is formed with a suction passage 13b penetrating the cylinder block 13 in the entire axial direction. The compression chamber 21 and the suction space Sa in the suction stroke are communicated with each other through the suction port 14b and the suction passage 13b.

  As shown in FIG. 2, a notch 13 d is recessed from the outer peripheral surface of the cylinder block 13 in each of the outer peripheral surfaces located at the center in the vertical direction of the cylinder block 13 and on both sides of the cylinder block 13. Is formed. Both the notches 13d are formed so as to extend over the entire axial direction of the cylinder block 13, and form a part of the discharge space Da. Each of the two notches 13d has a step surface 13f extending from the outer peripheral surface of the cylinder block 13 toward the inside of the cylinder block 13, and extending toward the outer peripheral surface of the cylinder block 13 while intersecting the step surface 13f. It has a surface 13g. Of the two cutouts 13d, one (left in FIG. 2) cutout 13d is formed so that the stepped surface 13f is positioned above the mounting surface 13g, and the other (right in FIG. 2) cutout 13d. Is formed such that a step surface 13f is positioned below the mounting surface 13g.

  A discharge port 13a is formed at the center of the cylinder block 13 in the vertical direction so as to communicate the compression chamber 21 and the discharge space Da during the compression stroke. Each discharge port 13a opens from each mounting surface 13g toward the discharge space Da. A discharge valve 22 is attached to each attachment surface 13g, and the discharge port 13a can be opened and closed by the discharge valve 22. The refrigerant gas compressed in the compression chamber 21 pushes the discharge valve 22 away and is discharged to the notch 13d (discharge space Da) through the discharge port 13a.

  As shown in FIG. 1, a discharge chamber 30 is defined by a rear side plate 15 on the rear side of the rear housing 11. That is, the interior of the rear housing 11 is partitioned by the rear side plate 15 into the discharge space Da side and the discharge chamber 30 side. The discharge chamber 30 is a space surrounded by the second end surface 15 b as the other end surface of the rear side plate 15 and the rear inner surface of the rear housing 11. The second end surface 15 b is an end surface located on the opposite side of the first end surface 15 a in the thickness direction of the rear side plate 15.

  As shown in FIG. 3, the second end surface 15b of the rear side plate 15 is formed with a bulging portion 15c that bulges to the rear side with a certain thickness. A pair of discharge passages 15e is formed in the bulging portion 15c. Each discharge passage 15e is formed of a groove 15f recessed in the bulging portion 15c, and a throttle portion 15g communicating with the lower end (one end) of the groove 15f and extending through the rear side plate 15 in the thickness direction. Has been. The throttle portion 15g has a front end (one end) that opens toward the discharge space Da and communicates with the discharge space Da, and a rear end (other end) communicates with the lower end (one end) of the groove portion 15f (see FIG. 1). ).

  As shown in FIG. 1, the front end of each throttle portion 15g is formed at the central portion in the vertical direction of the rear side plate 15 so as to correspond to the discharge port 13a. That is, each throttle portion 15g is formed at two locations on the rear side plate 15 so as to sandwich the rotating shaft 17 at the center in the vertical direction of the rear side plate 15, and the throttle portion 15g is formed at the lower portion of the rear side plate 15. Not. Since the refrigerant gas in the discharge space Da passes through the discharge passage 15e and is supplied to the discharge chamber 30, it is decompressed by being throttled by the throttle portion 15g in the discharge passage 15e. Therefore, the discharge chamber 30 into which the decompressed refrigerant gas is discharged is a low-pressure portion having a pressure lower than that of the discharge space Da, and is located downstream of the discharge space Da in the refrigerant gas flow direction.

  In the vane compressor 10, an oil separator 40 for separating the lubricating oil contained in the refrigerant gas is provided in the discharge chamber 30, and the oil separator 40 has a low pressure that is the same as that of the discharge chamber 30. Has become a department. In the discharge chamber 30, an oil storage chamber 31 is defined outside the oil separator 40.

  The oil separator 40 includes a case 41 joined and fixed to the bulging portion 15c via the gasket G so as to cover both the discharge passages 15e, a bottomed cylindrical oil separation chamber 42 formed in the case 41, A cylindrical oil separation cylinder 43 fitted and fixed to the upper part of the oil separation chamber 42 is formed. The case 41 is formed with a pair of communication passages 41a (see FIG. 4) so as to communicate with the upper end (the other end) of each discharge passage 15e, and the communication passage 41a faces the outer peripheral surface of the oil separation cylinder 43. Is formed. The discharge passage 15 e connects the discharge space Da and the oil separator 40 provided in the discharge chamber 30.

  In the oil separator 40, an oil passage 41 b is formed in the lower portion of the case 41 to allow the lubricating oil in the oil separation chamber 42 to flow down to the oil storage chamber 31. Further, an oil supply passage 15 d for guiding the lubricating oil stored in the oil storage chamber 31 (on the bottom side of the discharge chamber 30) to the vane groove 18 a and the like is formed in the bulging portion 15 c of the rear side plate 15. .

  As shown in FIGS. 1, 3, and 4, an oil return passage 45 for returning the lubricating oil in the discharge space Da to the discharge chamber 30 is formed in the lower portion of the rear side plate 15. The oil return passage 45 is recessed so as to communicate with the oil return hole 45b formed to extend within the thickness of the rear side plate 15 and the oil return hole 45b and to be exposed at the end face of the bulging portion 15c. And an oil return groove 45a.

  The front end of the oil return hole 45b opens at the lower end of the first end surface 15a so as to open toward the vicinity of the lowermost portion of the discharge space Da. The oil return hole 45b is formed to extend obliquely upward within the thickness of the rear side plate 15 so that the rear end thereof is positioned above the front end, and the rear end of the oil return hole 45b is formed at the bulging portion 15c. Is opened at a position slightly below the rotary shaft 17.

  The oil return groove 45a is formed to extend obliquely upward from the oil return hole 45b so that the lower end communicates with the rear end of the oil return hole 45b and the upper end communicates with the groove portion 15f in the discharge passage 15e. . The oil return groove 45a communicates with a groove portion 15f on the downstream side of the throttle portion 15g in the refrigerant gas flow direction. The oil return groove 45 a is sealed from the discharge chamber 30 by joining the gasket G to the bulging portion 15 c of the rear side plate 15.

  Therefore, the discharge space Da and the discharge passage 15 e communicating with the discharge chamber 30 are connected by the oil return passage 45. The oil return passage 45 is provided so as to be located below the discharge passage 15e and the discharge port 13a. Furthermore, since the discharge passage 15e communicates with the communication passage 41a of the oil separator 40, the discharge space Da and the oil separator 40 are connected via the oil return passage 45 and the discharge passage 15e.

Next, the operation of the vane compressor having the above configuration will be described.
When the rotating shaft 17 is rotated, the rotor 18 and the vane 20 are rotated, and the refrigerant gas is sucked into the compression chamber 21 during the suction stroke from the suction space Sa through the suction port 14b and the suction passage 13b. Then, the refrigerant gas sucked into the compression chamber 21 is compressed by reducing the volume of the compression chamber 21 during the compression stroke. The compressed refrigerant gas is discharged from the discharge port 13a to the notch 13d (discharge space Da). When the refrigerant gas is discharged from the discharge port 13a to the discharge space Da, the lubricating oil is separated from the refrigerant gas by, for example, the refrigerant gas colliding with the inner peripheral surface of the rear housing 11, and the lubricating oil is discharged into the discharge space Da. Will exist.

  The refrigerant gas discharged into the discharge space Da is throttled by the throttle portion 15g and then flows into the groove portion 15f. The refrigerant gas flows into the communication passage 41a from the groove 15f, and is supplied to the oil separator 40 from the communication passage 41a. The refrigerant gas is blown from the communication passage 41 a to the outer peripheral surface of the oil separation cylinder 43, and is guided to the lower side of the oil separation chamber 42 while turning the outer peripheral surface of the oil separation cylinder 43. At this time, the lubricating oil is separated from the refrigerant gas by centrifugal separation. The lubricating oil separated from the refrigerant gas is stored in the oil separation chamber 42 and further dropped from the oil passage 41 b to the oil storage chamber 31 of the discharge chamber 30. The lubricating oil stored in the oil storage chamber 31 is guided from the oil supply passage 15d to the vane groove 18a and the sliding portions in the vane compressor 10, and each sliding portion is lubricated by the lubricating oil. On the other hand, the refrigerant gas from which the lubricating oil has been separated moves upward in the oil separation cylinder 43 and is led out of the vane compressor 10 (for example, an external refrigerant circuit).

  In such a vane compressor 10, the lubricating oil separated from the refrigerant gas in the discharge space Da passes through the oil return hole 45b and enters the oil return groove 45a based on the differential pressure between the discharge space Da and the discharge chamber 30. Inflow. Further, the lubricating oil flows from the oil return groove 45a into the groove portion 15f of the discharge passage 15e. The lubricating oil that has flowed into the groove 15 f is supplied to the oil separator 40 from the communication passage 41 a on the refrigerant gas flowing through the discharge passage 15 e toward the oil separator 40. The lubricating oil is separated from the refrigerant gas by the oil separator 40 and then dropped into the oil storage chamber 31. Therefore, by providing the oil return passage 45 that connects the discharge space Da and the discharge chamber 30 in the vane compressor 10, the lubricating oil in the discharge space Da can be returned to the discharge chamber 30.

According to the above embodiment, the following effects can be obtained.
(1) A discharge space Da is defined on the outer peripheral side of the compression chamber 21, a discharge chamber 30 is defined in the housing H, and a discharge passage 15 e that connects the discharge space Da and the discharge chamber 30 is formed in the rear side plate 15. In the vane compressor 10, an oil return passage 45 that connects the discharge space Da and the discharge passage 15e is formed below the discharge passage 15e. For this reason, even if the lubricating oil is separated from the refrigerant gas in the discharge space Da, the lubricating oil in the discharge space Da is returned to the discharge passage 15e via the oil return passage 45 and is put on the refrigerant gas passing through the discharge passage 15e. Lubricating oil can be returned to the discharge chamber 30. Therefore, by forming the oil return passage 45, it is possible to prevent the lubricating oil from being stored in the discharge space Da. Accordingly, it is possible to prevent the discharge pulsation by reducing the volume of the discharge space Da having the buffering action of the discharge pulsation. Further, it is possible to prevent the lubricant oil from being deadly stored in the discharge space Da, and to prevent the amount of the lubricant oil flowing through the vane compressor 10 from being lowered. As a result, it is possible to prevent a decrease in the amount of lubricating oil supplied to each sliding portion in the vane compressor 10 and to prevent a decrease in reliability of each sliding portion.

  (2) The oil return passage 45 that connects the discharge space Da and the discharge passage 15e is formed in the rear side plate 15. Therefore, even if the lubricating oil is separated from the refrigerant gas in the discharge space Da, the lubricating oil in the discharge space Da is returned to the discharge passage 15e via the oil return passage 45, and the lubricating oil is supplied together with the refrigerant gas flowing through the discharge passage 15e. It can be returned to the discharge chamber 30. Therefore, it is possible to prevent the lubricating oil from accumulating in the discharge space Da. Therefore, it is possible to prevent the lubricating oil accumulated in the discharge space Da from interfering with the operation of the discharge valve 22 (particularly, deformation in the opening direction). As a result, the delay in opening the discharge space Da is prevented, and over-compression can be prevented to reduce the power loss of the vane compressor 10.

  (3) The oil return passage 45 is communicated with the discharge space Da and the discharge passage 15e. The refrigerant gas discharged from the discharge space Da flows into the discharge passage 15e. For this reason, the lubricating oil returned to the discharge passage 15e by the oil return passage 45 can be returned to the discharge chamber 30 (oil separator 40) by the refrigerant gas flowing through the discharge passage 15e.

  (4) The lubricating oil in the discharge space Da is returned to the discharge passage 15e through the oil return passage 45, and is supplied to the oil separator 40 from the discharge passage 15e through the communication passage 41a. For this reason, even if the refrigerant gas in the discharge space Da is returned to the discharge passage 15e together with the lubricating oil by the oil return passage 45, the refrigerant gas and the lubricating oil can be separated by the oil separator 40. Therefore, for example, the refrigerant gas and the lubricating oil can be separated with higher accuracy than when the lubricating oil in the discharge space Da is directly returned to the oil storage chamber 31 by the oil return passage 45.

  (5) A pair of notches 13d are recessed in the outer peripheral surface of the cylinder block 13, and a discharge port 13a is opened in the mounting surface 13g recessed from the outer peripheral surface of the cylinder block 13 so as to form each notch 13d. is doing. Each notch 13d has a step surface 13f so as to intersect the mounting surface 13g. One step surface 13f is located above the mounting surface 13g, and the other step surface 13f is formed on the mounting surface 13g. Located on the lower side. For this reason, the lubricating oil is more easily stored in one cutout portion 13d than in the other cutout portion 13d, and the difference in how the lubricating oil is stored in the cutout portion 13d is between the two cutout portions 13d. If a pressure difference occurs, the rotor 18 may rattle due to the pressure difference, and noise may be generated. However, in this embodiment, since the oil return passage 45 is formed to prevent the lubricating oil from being stored in the discharge space Da, the inside of the cylinder block 13 of the rotor 18 can be obtained even if the shape of the notch 13d is different. It is possible to prevent rattling from occurring and to prevent the generation of noise due to this rattling.

  (6) The oil return passage 45 is formed in the rear side plate 15 that partitions the discharge space Da and the discharge chamber 30 in the housing H. Therefore, it is possible to prevent the lubricating oil from accumulating in the discharge space Da with a simple configuration in which only one member (the rear side plate 15) forming the vane compressor 10 is processed.

  (7) A discharge passage 15e is formed in the rear side plate 15 in order to discharge the refrigerant gas from the discharge space Da to the discharge chamber 30. The throttle portion 15g in the discharge passage 15e is formed at the central portion of the rear side plate 15 in the vertical direction. For this reason, even if the lubricating oil is separated from the refrigerant gas in the discharge space Da, it is possible to prevent the discharge passage 15e from being filled with the lubricating oil.

  (8) The oil return passage 45 is provided so as to be positioned below the discharge passage 15e, and the front end of the oil return hole 45b in the oil return passage 45 opens toward the lowermost portion of the discharge space Da. It is formed on the rear side plate 15. Therefore, even if the lubricating oil is stored in the lower part of the discharge space Da, the lubricating oil can be returned to the discharge chamber 30 by the oil return passage 45.

  (9) The oil return passage 45 has a front end communicating with the discharge space Da and a rear end communicating with the discharge passage 15e located downstream of the discharge space Da in the refrigerant gas flow direction. Here, for example, when the oil return passage 45 connects the discharge space Da and the compression chamber 21 located on the upstream side of the discharge space Da in the refrigerant gas flow direction, in order to suppress the return amount of the lubricating oil. The passage cross-sectional area of the oil return passage 45 needs to be extremely small. However, in this embodiment, since the oil return passage 45 is communicated with the discharge passage 15e downstream from the discharge space Da, it is not necessary to suppress the return amount of the lubricating oil to the discharge chamber 30 (oil separator 40). The passage cross-sectional area of the oil return passage 45 can be formed relatively large. Further, when the lubricating oil is not stored in the discharge space Da, the refrigerant gas in the discharge space Da escapes to the compression chamber 21 through the oil return passage 45, and the refrigerant gas is recompressed, so that the vane compressor 10 compression efficiency will fall. However, in the present embodiment, the oil return passage 45 is communicated with the discharge passage 15e downstream of the discharge space Da, so that the refrigerant gas is not recompressed, and the compression efficiency of the vane compressor 10 is not reduced. Lubricating oil can be returned to the discharge chamber 30.

In addition, you may change the said embodiment as follows.
As shown in FIG. 5, the oil return passage 50 has a first passage 51 formed in the rear side plate 15 so that a front end (one end) communicates with the discharge space Da, and the first passage 51 and the discharge passage 15e. And the second passage 52 formed in the gasket G so as to communicate with each other.

  The thickness of the rear side plate 15 is such that the front end (one end) communicates with the discharge space Da and the rear end (other end) communicates with the lower portion (oil storage chamber) of the discharge chamber 30 as a low pressure portion. Alternatively, the lubricating oil in the discharge space Da may be directly returned to the lower portion of the discharge chamber 30.

  The oil return passage is arranged on the rear side plate so that the front end (one end) communicates with the discharge space Da and the rear end (other end) communicates directly with the communication passage 41a of the oil separator 40 as a low pressure portion. 15 and the case 41 may be formed.

  The oil return passage may be formed in the cylinder block 13 so that one end of the oil return passage communicates with the discharge space Da and the other end communicates with the compression chamber 21 (low pressure portion) during the suction stroke. In this case, the oil return passage is formed by a notch formed in the rear end surface of the cylinder block 13 facing the rear side plate 15.

The oil return passage may be formed such that one end communicates with the discharge space Da and the other end communicates with the suction passage 13b or the oil supply passage 15d as a low pressure portion.
In the embodiment, the oil separator 40 may be deleted, and the lubricating oil returned to the discharge passage 15e by the oil return passage 45 may be directly returned to the discharge chamber 30 from the discharge passage 15e. In this case, the oil return groove 45a in the oil return passage 45 is sealed by the gasket G.

Next, the technical idea that can be grasped from the above embodiment and other examples will be described below.
(1) A gasket is interposed between the one side plate and the oil separator, and the oil return passage is a first passage formed in the side plate so that one end communicates with the discharge space. The vane compressor according to claim 4, wherein the first passage and the second passage are formed in the gasket so as to communicate with the discharge passage.

  (2) The vane compressor according to any one of claims 1 to 5, wherein a throttle portion communicating with the discharge space in the discharge passage is formed at a central portion in the vertical direction of the cylinder block. .

A longitudinal section showing a vane compressor of an embodiment. The 2-2 sectional view taken on the line of FIG. 1 which shows the inside of the vane compressor of embodiment. FIG. 3 is a cross-sectional view taken along line 3-3 of FIG. 1 showing a second end surface of the rear side plate. 4 is a cross-sectional view taken along line 4-4 of FIG. 1 showing a state in which an oil separator is joined to the rear side plate. Sectional drawing which shows another example of an oil return channel | path.

Explanation of symbols

  H ... Housing, Da ... Discharge space, 10 ... Vane compressor, 13 ... Cylinder block, 13b ... Suction passage as low pressure part, 14 ... Front side plate as side plate, 14a ... First end face as one end face, DESCRIPTION OF SYMBOLS 15 ... Rear side plate as one side plate, 15a ... 1st end surface as one end surface, 15b ... 2nd end surface as the other end surface, 15d ... Oil supply passage as a low pressure part, 15e ... Discharge passage, 18 ... Rotor, 20 ... vane, 21 ... compression chamber (low pressure part), 30 ... discharge chamber as low pressure part, 40 ... oil separator, 41a ... communication passage, 45, 50 ... oil return passage, 45a ... oil return groove, 45b ... oil return hole.

Claims (5)

A cylindrical cylinder block is accommodated in the housing, and a rotor having a vane is rotatably accommodated in the cylinder block, and side plates are joined to both ends of the cylinder block. A compression chamber is formed in the cylinder block, and includes an outer peripheral surface of the cylinder block, an inner peripheral surface of the housing that faces the outer peripheral surface, and one end surface that faces the cylinder block in both side plates. In the enclosed space, a discharge space for the refrigerant gas compressed in the compression chamber is defined, and further, refrigerant gas is discharged from the discharge space between the other end surface of one side plate and the inner surface of the housing. A discharge chamber to be discharged is partitioned, and the discharge space and the discharge chamber are provided on the one side plate. A vane compressor ingredients discharge passage is formed,
An oil return passage is provided below the discharge passage to connect the discharge space and a low pressure portion having a pressure lower than that of the discharge space. The vane compressor in which the lubricating oil is returned to the low pressure portion.   The vane compressor according to claim 1, wherein the low-pressure portion is the discharge chamber.   The vane compressor according to claim 2, wherein one end of the oil return passage communicates with the discharge space, and the other end communicates with the discharge passage.   An oil separator that separates lubricating oil from the refrigerant gas is joined to the other end face of the one side plate, and the oil separator is provided in the discharge chamber. The oil separator has the discharge passage. The vane compressor according to claim 3, wherein a communication passage communicating with the vane compressor is formed.   The oil return passage includes an oil return hole formed in the side plate so that one end communicates with the discharge space, and the other end of the side plate communicates with the other end of the oil return hole and the discharge passage. The vane compressor as described in any one of Claims 2-4 currently formed from the oil return groove recessedly provided in the end surface.

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