JP2014202160A - Compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compressor capable of reducing its manufacturing cost and its size while suppressing a reduction in the cooling capability with lubricating oil circulating in a refrigerating circuit.SOLUTION: The compressor includes a compression unit (6, 14) forming a compression chamber (18) for operating fluid including lubricating oil, a housing (2) forming a suction chamber for the operating fluid between the compression unit and itself, and having a discharge chamber (24) and a discharge port (48) for the operating fluid laid in sequence through the suction chamber, the compression unit and the compression chamber, a separation chamber (50) provided downstream of the discharge camber and upstream of the discharge port in view from the flowing direction of the operating fluid, and having a first recessed part (52) recessed in a back face (14a) of the compression unit, for separating the lubricating oil from the operating fluid, and a gasket (26) located between the back face and the discharge port for sealing the discharge chamber to outside air and blocking the first recessed part to define the separation chamber.

Description

  The present invention relates to a compressor, and more particularly to a compressor incorporated in a refrigeration circuit of a vehicle air conditioning system.

  This type of compressor for a refrigeration circuit compresses a refrigerant as a working fluid, and this refrigerant usually contains lubricating oil. The lubricating oil in the refrigerant not only lubricates the sliding surfaces and bearings in the compressor, but also functions as a seal for the sliding surfaces. However, when this lubricating oil circulates in the refrigeration circuit, the oil film inhibits heat exchange and also causes a pressure loss, which causes a reduction in the cooling capacity of the refrigeration / air conditioning apparatus.

  For this reason, this type of compressor may incorporate a lubricating oil separator. This lubricating oil separation device separates lubricating oil from the compressed refrigerant in the process until the refrigerant compressed in the compressor is guided from the discharge chamber to the discharge port. More specifically, the lubricating oil separation device has a separation chamber disposed between the discharge chamber and the discharge port, and introduces the compressed refrigerant in the discharge chamber into the separation chamber via the ejection holes, thereby converting the lubricating oil from the compressed refrigerant to the lubricating oil. Isolate. The separated lubricating oil is stored in an oil storage chamber below the separation chamber (see, for example, Patent Document 1).

  This compressor is a scroll type compressor, and a scroll unit as a compression unit is accommodated in the housing. The scroll unit includes a movable scroll and a fixed scroll that mesh with each other. Engagement of these scrolls forms the compression chamber therein, and the volume of the compression chamber is increased or decreased with the orbiting motion of the movable scroll with respect to the fixed scroll.

JP 2005-188394 A

  By the way, in the conventional compressor, a separation chamber having a substantially cylindrical cross section is formed by casting a recess on each of the rear surfaces of the housing and the fixed scroll. Further, the refrigerant injection hole into the separation chamber and the lubricating oil introduction hole introduced into the oil storage chamber after separation in the separation chamber are formed by cutting out both the housing and the back of the fixed scroll. A separation pipe is provided in the separation chamber. In this structure, since the discharge chamber and the oil storage chamber of the refrigerant communicated with the separation chamber and the separation chamber must be arranged so as to surround the discharge valve provided on the back surface of the fixed scroll, the design of the shape of the discharge valve The degree of freedom is hindered.

  Specifically, in order to make the shape of the discharge valve taking fatigue strength into consideration, the discharge valve can be replaced with the back of the fixed scroll so that the cylinder diameter of the compressor is enlarged or the separation chamber does not interfere with the discharge valve. Thus, an intermediate plate that engages with the housing is provided, and a discharge valve is disposed in a space between the housing and the intermediate plate. In the former case, the compressor becomes large in the radial direction of the drive shaft, and in the latter case, the compressor becomes large in the axial direction of the drive shaft and the shape of the housing becomes complicated. There is a problem that it is not possible to satisfy the sizing regulations regarding the mounting of the compressor.

  The present invention has been made in view of such a problem, and while suppressing the decrease in cooling capacity due to the circulation of the lubricating oil through the refrigeration circuit, the manufacturing cost of the compressor is reduced, and the compressor is downsized. It aims at providing the compressor which can aim at.

  In order to achieve the above object, a compressor according to claim 1 is provided with a compression unit forming a compression chamber for a working fluid containing lubricating oil, and a suction chamber for the working fluid formed between the compression unit and the suction unit. A chamber, a compression unit, a housing having a discharge chamber and a discharge port for the working fluid successively connected through the compression chamber, and a downstream of the discharge chamber and an upstream of the discharge port in the flow direction of the working fluid. A separation chamber for separating the lubricating oil from the working fluid by a centrifugal force generated by the swirling of the working fluid; and a rear chamber and a discharge port. And a gasket for sealing and closing the first recess to define a separation chamber.

In the second aspect of the invention, the back surface has a first groove portion that is recessed from the first recessed portion toward the discharge chamber side, and the discharge chamber and the separation chamber are communicated by closing the first groove portion with a gasket. A working fluid ejection passage is defined as follows.
According to a third aspect of the present invention, the gasket includes an ejection hole for the working fluid that communicates the separation chamber and the discharge port.

According to a fourth aspect of the present invention, there is provided an oil storage chamber for storing lubricating oil separated from the working fluid in the housing, and a second groove portion recessed on the back surface from the first recess toward the oil storage chamber. A lubricating oil introduction path defined to communicate between the oil storage chamber and the separation chamber by closing the two groove portions with a gasket is provided.
According to a fifth aspect of the present invention, the gasket includes a lubricating oil introduction hole that communicates the discharge port with the introduction path.

In the invention according to claim 6, the ejection path is opened in the separation chamber along the outer tangent line of the separation chamber and upward from the horizontal.
In the invention according to claim 7, the introduction path is opened to the separation chamber so as to face the swirling flow of the working fluid in the separation chamber and upward from the horizontal.
In the invention according to claim 8, the introduction path has a plurality of protrusions extending along the outer peripheral tangent line of the separation chamber and extending upward from the horizontal.

According to the ninth aspect of the present invention, the gasket has a second recess opening toward the first recess with the surface including the ejection hole as a bottom, and the first recess is closed by the second recess to define the separation chamber. .
In the invention of claim 10, the first recess and the second recess are each formed in a truncated cone shape having a female tapered surface, and the separation chamber has a large diameter that forms a truncated cone shape of the first recess and the second recess. It has a shape that matches the ends.

  According to the compressor of the first aspect of the present invention, the gasket closes the first recess formed in the back surface of the compression unit to define the separation chamber for the lubricating oil from the working fluid. As a result, the housing, and hence the compressor, is shorter in the axial direction of the drive shaft and smaller in the radial direction than in the case where the recess is formed in the housing to form the separation chamber, and the shape of the housing is simplified. Can do. Therefore, while satisfying the stipulations regarding the installation of the compressor required for the vehicle, the reduction of the cooling capacity due to the lubricating oil circulating in the refrigeration circuit is suppressed, and the separation pipe and the intermediate plate are not required so The manufacturing cost can be reduced and the compressor can be downsized.

  According to the second aspect of the present invention, the working fluid ejection passage which connects the discharge chamber and the separation chamber by closing the first groove portion provided in the back surface from the first recess toward the discharge chamber side with the gasket. Is defined. As a result, the compressor can be formed in a shorter axial direction, smaller in the radial direction, and with a simplified housing shape, compared to the case where the recess is formed in the housing to define the ejection path. The manufacturing cost can be further reduced, and the compressor can be further reduced in size.

  According to a third aspect of the present invention, the gasket includes a working fluid ejection hole that communicates the separation chamber and the discharge port. As a result, the compressor can be formed in a shorter axial direction and smaller in the radial direction and with a simplified housing shape, compared to the case where the housing is processed to form the ejection holes, and the compressor manufacturing cost can be reduced. Can be further reduced, and the compressor can be further reduced in size.

  According to the fourth aspect of the present invention, the lubricating oil introduction path that allows the oil storage chamber and the separation chamber to communicate with each other by closing the second groove formed in the rear surface from the first recess toward the oil storage chamber with the gasket. Is defined. As a result, the compressor can be formed to be shorter in the axial direction, smaller in the radial direction, and simplified in the shape of the housing, compared to the case where the recess is formed in the housing to define the introduction path. The manufacturing cost can be further reduced, and the compressor can be further reduced in size.

  According to the fifth aspect of the present invention, the gasket includes a lubricating oil introduction hole that communicates the discharge port and the introduction path. As a result, the lubricating oil separated from the working fluid by colliding with the housing without being completely separated in the separation chamber can be collected in front of the discharge port and collected in the oil storage chamber via the introduction path. Therefore, the recovery efficiency of the lubricating oil can be further increased, and a decrease in cooling capacity due to the lubricating oil circulating in the refrigeration circuit can be more effectively suppressed.

According to the invention described in claim 6, the ejection path is opened in the separation chamber along the outer peripheral tangent line of the separation chamber and upward from the horizontal. Thereby, the swirling flow of the refrigerant along the separation chamber can be smoothly formed without reducing the flow rate of the refrigerant.
According to the seventh aspect of the present invention, the introduction path is opposed to the swirling flow of the working fluid in the separation chamber and is opened to the separation chamber upward from the horizontal. Thereby, the lubricating oil separation from the refrigerant is further promoted by the synergistic action of the centrifugal force of the swirling flow of the working fluid formed along the separation chamber and the gravity.

According to an eighth aspect of the present invention, the introduction path has a plurality of protrusions that extend along the outer peripheral tangent line of the separation chamber and upward in the horizontal direction. Accordingly, the swirling flow of the refrigerant along the separation chamber can be smoothly formed without reducing the flow rate of the refrigerant, and the synergistic action between the centrifugal force of the refrigerant formed along the separation chamber and the gravity causes the refrigerant to flow. This further promotes the separation of the lubricating oil.
According to invention of Claim 9, a gasket has the 2nd recessed part opened toward the 1st recessed part by making the surface containing an ejection hole into a bottom part, obstruct | occludes a 1st recessed part with a 2nd recessed part, and has a separation chamber. Define. As a result, compared to the case where the separation chamber is formed only by the first recess, the compressor is formed with a shorter axial direction, a smaller radial direction, a simplified housing shape, and a larger separation chamber capacity. can do. Therefore, the recovery efficiency of the lubricating oil can be further increased, and a decrease in cooling capacity due to the lubricating oil circulating in the refrigeration circuit can be more effectively suppressed.

  According to invention of Claim 10, a separation chamber has the shape which match | combined the large diameter ends which form the truncated cone shape of a 1st recessed part and a 2nd recessed part. As a result, the working fluid flows into the separation chamber from the ejection path and flows spirally along each female tapered surface. At this time, the lubricating oil having a higher specific gravity than the working fluid adheres to each female taper surface due to the centrifugal force acting on the working fluid, and the lubricating oil can be efficiently separated and recovered. Therefore, the recovery efficiency of the lubricating oil can be further increased, and a reduction in cooling capacity due to the lubricating oil circulating in the refrigeration circuit can be further effectively suppressed.

It is the longitudinal section showing the important section of the scroll type compressor concerning one embodiment of the present invention. It is the disassembled perspective view which showed the compressor of FIG. 1 from the rear housing side. It is the disassembled perspective view which showed the compressor of FIG. 1 from the front housing side. It is the longitudinal cross-sectional view which showed the principal part of the compressor in order to demonstrate isolation | separation of the lubricating oil from the refrigerant | coolant in the separation chamber of FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a compressor according to this embodiment. The compressor 1 is a horizontal type scroll compressor, and is incorporated in a refrigeration circuit of an air conditioning system of a vehicle. The compressor 1 sucks the refrigerant from the return path of the refrigerant circulation path of the refrigerant that is the working fluid, compresses the refrigerant, and discharges the refrigerant toward the forward path of the circulation path. The refrigerant contains lubricating oil, and the lubricating oil in the refrigerant not only lubricates the bearings and various sliding surfaces in the compressor 1 but also functions to seal the sliding surfaces.

  As shown in FIGS. 2 and 3, the compressor 1 includes a rear housing 2 and a front housing 4, and a scroll unit (compression unit) 6 is disposed between the rear housing 2 and the front housing 4. A drive shaft 8 is horizontally disposed in the front housing 4, and the drive shaft 8 is rotatably supported by the front housing 4 via a bearing. In addition, the arrow direction shown in FIG.2 and FIG.3 is a horizontal direction.

  A drive pulley 12 incorporating an electromagnetic clutch 10 is attached to the projecting end of the drive shaft 8, and this drive pulley 12 is rotatably supported by the front housing 4 through a bearing. The power of the vehicle engine is transmitted to the drive pulley 12 via a drive belt (not shown), and the rotation of the drive pulley 12 can be transmitted to the drive shaft 8 via the electromagnetic clutch 10. Therefore, when the electromagnetic clutch 10 is turned on while the engine is being driven, the drive shaft 8 rotates integrally with the drive pulley 12.

  On the other hand, the scroll unit 6 includes a fixed scroll 14 sandwiched between the rear housing 2 and the front housing 4 and a movable scroll 16 assembled so as to be engaged with the fixed scroll 14. The meshing of the fixed scroll 14 and the movable scroll 16 forms a compression chamber 18 therein, and the volume of the compression chamber 18 is increased or decreased with the revolution orbiting motion of the movable scroll 16 relative to the fixed scroll 14.

The movable scroll 16 and the drive shaft 8 are connected to each other via a crank mechanism (not shown) in order to impart the revolving orbiting motion to the movable scroll 16 described above, and the rotation of the movable scroll 16 is prevented by a rotation prevention mechanism (not shown). Yes.
The fixed scroll 14 is fixed to the rear housing 2 via six fixing bolts 20. A discharge chamber 24 is formed between the fixed scroll 14 and the end wall 22 of the rear housing 2. The discharge chamber 24 is partitioned as one space with a gasket 26 therebetween. In the rear housing 2, a refrigerant discharge passage 30 is defined above the discharge chamber 24 by a partition wall 28, and a lubricant oil storage chamber 34 is defined below the discharge chamber 24 by a partition wall 32.

  In the fixed scroll 14, a discharge hole 36 that allows the compression chamber 18 and the discharge chamber 24 to communicate with each other is formed in the axial direction of the drive shaft 8. A discharge valve 38 for opening and closing the discharge hole 36 is disposed in the discharge chamber 24, and the opening degree of the discharge valve 38 is regulated by a stopper plate 40. The discharge valve 38 and the stopper plate 40 are attached to the back surface 14 a of the fixed scroll 14 via attachment screws 44 screwed into the screw holes 42.

On the other hand, a space between the inner peripheral wall of the front housing 4 and the movable scroll 16 is ensured as a suction chamber (not shown). This suction chamber is connected to the refrigerant circulation path described above via a suction port 46 protruding from the outer peripheral wall of the front housing 4. It is connected to the return route.
Also, a discharge port (discharge port) 48 is provided on the end wall 22 of the rear housing 2, and the discharge port 48 communicates with the forward path of the refrigerant circulation path, while the discharge flow path 30 and the refrigerant separation chamber 50 are provided. Through the discharge chamber 24. The separation chamber 50 is positioned between the discharge chamber 24 and the discharge port 48, separates the lubricating oil from the refrigerant discharged into the discharge chamber 24, and the refrigerant after the lubricating oil is separated is discharged into the discharge passage 30. It flows through port 48 in order.

  Specifically, a part of the discharge chamber 24, a first recess 52, a first groove 54, and a second groove 56 are provided in the back surface 14 a of the fixed scroll 14. The first recess 52 is provided downstream of the discharge chamber 24 and upstream of the discharge port 48 in the refrigerant flow direction, and is recessed in a truncated cone shape having a female tapered surface 58 above the discharge chamber 24. It has the bottom part 60 used as the small-diameter end of a truncated cone shape, and the opening edge 62 used as the large-diameter end of a truncated cone shape.

  The upper end of the first groove portion 54 is opened to the separation chamber 50 along the outer peripheral tangent line of the separation chamber 50, that is, the opening edges 62 and 74 and upward from the horizontal, and more specifically, the opening edge near the upper right half of the first recess 52. The first concave portion 52 is opened along the tangent line of the opening edge 62 so as to continue from 62, and extends substantially linearly to a position that is inclined obliquely in the lower right direction and reaches a region corresponding to the discharge chamber 24. . When the gasket 26 and the rear housing 2 are assembled to the fixed scroll 14, the lower end of the first groove portion 54 is opened to the discharge chamber 24.

  The upper end of the second groove portion 56 is opposed to the swirling flow of the refrigerant in the separation chamber 50 and is opened to the separation chamber 50 upward from the horizontal. Specifically, the upper end of the second groove portion 56 is continuous from the opening edge 62 near the lower left half of the first recess 52. Thus, the first recess 52 is opened along the tangent line of the opening edge 62. The second groove portion 56 extends in an arc shape along the outer periphery of the back surface 14 a to a position that is inclined obliquely in the lower left direction and reaches a region corresponding to the oil storage chamber 34. Further, the plurality of protrusions 63 extend in a comb shape along the outer peripheral tangent line of the separation chamber 50, that is, along the opening edges 62 and 74 and upward from the horizontal in the second groove portion 56 so as not to reach the separation chamber 50. ing.

  When the gasket 26 and the rear housing 2 are assembled to the fixed scroll 14, the lower end of the second groove portion 56 is opened to the oil storage chamber 34. Further, in the region including the lower end of the second groove portion 56, a return path 64 for lubricating oil is provided which communicates the fixed scroll 14 and the gasket 26 with the suction chamber. An orifice (not shown) is provided in the return path 64. It is inserted.

On the other hand, the gasket 26 is positioned between the back surface 14a and the discharge flow path 30 and the discharge port 48, and is hermetically fitted to the back surface 14a and the rear housing 2, thereby sealing the discharge chamber 24 and the outside air. And the 1st recessed part 52 is obstruct | occluded and the separation chamber 50 is demarcated.
Specifically, the gasket 26 is formed to have the same outer shape as the back surface 14 a, and includes a second recess 66, a refrigerant ejection hole (ejection hole) 68, and an oil introduction hole (introduction hole) 70. The second recess 66 has a female tapered surface 72 and is formed in a truncated cone shape that is recessed in the opposite direction to the first recess 52, and a refrigerant injection hole 68 is opened at the small-diameter end of the truncated cone shape to form a truncated cone shape. An opening edge 74 is provided at the large-diameter end.

The second recess 66 is opened toward the first recess 52 with the surface including the refrigerant ejection hole 68 as the bottom 76, and when the gasket 26 is assembled to the fixed scroll 14, the opening edge 74 is aligned with the opening edge 62, and the second recess 66. The first recess 52 is closed by the recess 66, and a so-called abacus ball-shaped separation chamber 50 is defined in which the large-diameter ends of the frustoconical shapes of the first recess 52 and the second recess 66 are combined.
As shown in FIG. 4, when the gasket 26 is assembled to the fixed scroll 14, the first groove 54 is closed by the gasket 26, and the refrigerant that has passed through the discharge chamber 24 is ejected to the separation chamber 50 by the back surface 14 a and the gasket 26. A refrigerant ejection path (ejection path) 78 is defined. The second groove 56 is also closed by the gasket 26, and an oil introduction path (introduction path) 80 through which the lubricating oil separated in the separation chamber 50 flows out to the oil storage chamber 34 is defined by the back surface 14 a and the gasket 26.

The oil introduction hole 70 is the formation position of the oil introduction passage 80 when the gasket 26 and the rear housing 2 are assembled to the fixed scroll 14 in the gasket 26, and is opened at the lower end wall of the discharge passage 30. .
As shown in FIGS. 2 and 3, the gasket 26 has a discharge chamber facing hole 82, a discharge flow channel facing hole 84, and an oil storage chamber facing hole 86. The discharge chamber facing hole 82 is formed to have substantially the same shape as the discharge chamber 24 and is positioned at a position corresponding to a region surrounding the discharge chamber 24 when the gasket 26 and the rear housing 2 are assembled to the fixed scroll 14. And the discharge chamber 24 is defined.

  The discharge channel facing hole 84 is formed to have substantially the same shape as a part of the discharge channel 30, and a part of the discharge channel 30 when the gasket 26 and the rear housing 2 are assembled to the fixed scroll 14. The discharge channel 30 is defined at a position corresponding to a region surrounding the periphery of the discharge channel 30. The oil storage chamber facing hole 86 is formed to have substantially the same shape as the oil storage chamber 34, and the oil introduction path 80 of the second groove portion 56 is removed when the gasket 26 and the rear housing 2 are assembled to the fixed scroll 14. The oil storage chamber 34 is defined at a position corresponding to a region surrounding the periphery.

As described above, by assembling the gasket 26 to the rear housing 2, the above-described discharge flow path 30, discharge chamber 24, and oil storage chamber 34 are demarcated. On the other hand, by assembling the gasket 26 to the fixed scroll 14, the above-described separation is performed. A chamber 50, a discharge chamber 24, a refrigerant ejection path 78, and an oil introduction path 80 are defined.
According to the compressor 1 described above, as the drive shaft 8 rotates, the orbiting scroll 16 revolves without rotating. Such swiveling motion of the movable scroll 16 brings about a refrigerant suction process from the refrigerant suction chamber into the compression chamber 18 and a compression and discharge process of the sucked refrigerant. As a result, the high-pressure refrigerant is discharged from the compression chamber 18. It is discharged into the discharge chamber 24 through the discharge hole 36. Here, since the refrigerant contains lubricating oil, the lubricating oil in the refrigerant lubricates the bearings in the front housing 4, the sliding surface in the scroll unit 6, and the like, and also serves as a seal for the compression chamber 18. Contribute.

  As shown by the one-dot chain line in FIG. 4, the compressed refrigerant in the discharge chamber 24 passes through the refrigerant ejection path 78 and flows into the separation chamber 50, and along the female tapered surfaces 58 and 72 in the separation chamber 50. It is guided to the refrigerant jet hole 68 while turning. In this process, the lubricating oil in the compressed refrigerant is separated from the refrigerant based on the principle of centrifugal separation and adheres to the female tapered surfaces 58 and 72. Thereafter, the compressed refrigerant reaches the discharge flow path 30 and eventually the discharge port 48 through the refrigerant discharge hole 68, and is sent from the discharge port 48 toward the forward path of the refrigerant circulation path.

  On the other hand, as indicated by a two-dot chain line in FIG. 4, the lubricating oil separated from the compressed refrigerant in the separation chamber 50 travels along the female tapered surfaces 58 and 72 and flows down by gravity through the oil introduction path 80, and the oil storage chamber 34. Stored in Further, the lubricating oil separated from the refrigerant when a part of the compressed refrigerant collides with the wall of the discharge flow path 30 is joined to the oil introduction path 80 through the oil introduction hole 70 and stored in the oil storage chamber 34.

The oil storage chamber 34 is always in communication with the separation chamber 50, and its internal pressure is higher than the pressure of the refrigerant suction chamber. Therefore, the lubricating oil in the oil storage chamber 34 is returned toward the suction chamber through the return path 64 and the orifice inserted therein based on the pressure difference with the suction chamber. The lubricating oil returned to the suction chamber lubricates the crank mechanism and the rotation prevention mechanism described above and the bearing that supports the movable scroll 16 so as to be able to turn.
As described above, in this embodiment, the first recess 52 formed in the back surface 14 a of the fixed scroll 14 is closed by the second recess 66 of the gasket 26 to define the lubricant separation chamber 50. As a result, the rear housing 2 and thus the compressor 1 can be formed shorter in the axial direction of the drive shaft 8 and smaller in the radial direction than when the recesses are formed in the rear housing 2 to define the separation chamber 50. In addition, the shape of the rear housing 2 can be simplified. Therefore, while satisfying the stipulations regarding the mounting of the compressor required for the vehicle, the reduction of the cooling capacity due to the lubricating oil circulating in the refrigeration circuit is suppressed, and no separation pipe or intermediate plate is required. The manufacturing cost can be reduced and the compressor 1 can be downsized.

  In particular, in the present embodiment, the first recess 52 is closed by the second recess 66 to define the separation chamber 50, so that the compressor 1 is compared with the case where the separation chamber 50 is formed by only the first recess 52. The capacity of the separation chamber 50 can be increased while the shape of the rear housing 2 is simplified while the length is short in the axial direction and small in the radial direction. Therefore, the recovery efficiency of the lubricating oil can be further increased, and a decrease in cooling capacity due to the lubricating oil circulating in the refrigeration circuit can be more effectively suppressed.

  In addition, since the separation chamber 50 has an abacus ball shape formed by the first recess 52 and the second recess 66, the refrigerant flows into the separation chamber 50 from the refrigerant ejection path 78 and spirals along the female tapered surfaces 58 and 72. To form a swirling flow. At this time, the lubricating oil having a specific gravity higher than that of the refrigerant adheres to each of the female taper surfaces 58 and 72 due to the centrifugal force acting on the refrigerant, and flows down through the oil introduction path 80 by gravity, thereby efficiently separating and collecting the lubricating oil. be able to. Therefore, the recovery efficiency of the lubricating oil can be further increased, and a reduction in cooling capacity due to the lubricating oil circulating in the refrigeration circuit can be further effectively suppressed.

  Further, the first groove portion 54 and the second groove portion 56 are closed by the gasket 26, and the refrigerant ejection path 78 and the oil introduction path 80 are demarcated to form a recess in the rear housing 2, thereby forming the refrigerant ejection path 78 and the oil introduction path. Compared with the case where the path 80 is defined, the compressor 1 is shorter in the axial direction and smaller in the radial direction, the shape of the rear housing 2 can be simplified, and the manufacturing cost of the compressor can be further reduced, and Further downsizing of the compressor can be achieved.

In particular, the first groove portion 54, that is, the refrigerant ejection path 78, is opened to the separation chamber 50 along the outer peripheral tangent line of the separation chamber 50 and upward from the horizontal, so that each female of the separation chamber 50 is reduced without reducing the flow rate of the refrigerant. A swirling flow of the refrigerant along the tapered surfaces 58 and 72 can be formed smoothly.
Further, the second groove portion 56, that is, the oil introduction path 80 faces the swirling flow of the refrigerant in the separation chamber 50 and is opened to the separation chamber 50 above the horizontal, so that each female tapered surface of the separation chamber 50 is opened. The lubricating oil separation from the refrigerant is further promoted by the synergistic action of the centrifugal force of the refrigerant formed along the lines 58 and 72 and the gravity.

Further, since the gasket 26 includes the refrigerant ejection holes 68, the compressor 1 is shorter in the axial direction and smaller in the radial direction than in the case where the rear housing 2 is processed to form the refrigerant ejection holes 68. The shape of 2 can be simplified, the manufacturing cost of the compressor can be further reduced, and the compressor can be further downsized.
Further, since the gasket 26 includes the oil introduction hole 70, the lubricating oil separated from the refrigerant by colliding with the end wall 22 of the rear housing 2 in the discharge flow path 30 without being completely separated in the separation chamber 50 can be provided in front of the discharge port 48. And can be collected in the oil storage chamber 34 through the oil introduction path 80. Therefore, the recovery efficiency of the lubricating oil can be further increased, and a decrease in cooling capacity due to the lubricating oil circulating in the refrigeration circuit can be more effectively suppressed.

  Further, since the plurality of protrusions 63 extend along the outer peripheral tangent line of the separation chamber 50 in the second groove portion 56, that is, the oil introduction path 80, and upward from the horizontal, the separation chamber is not reduced without reducing the flow rate of the refrigerant. 50 can smoothly form a swirling flow of the refrigerant along each of the female tapered surfaces 58 and 72, and the centrifugal force and gravity of the refrigerant formed along each of the female tapered surfaces 58 and 72 of the separation chamber 50. The synergistic action of the lubricant further promotes the separation of the lubricating oil from the refrigerant.

  Specifically, the lubricating oil separated in the separation chamber 50 by the swirling flow of the refrigerant and attached to each of the female tapered surfaces 58 and 72 is formed upward from the horizontal due to the centrifugal force and gravity of the refrigerant swirling flow. It has been proved by experiments that the groove between the protrusions 63 is effectively collected as a refrigerant flow path, and the lubricating oil separation effect is improved. However, when the oil storage chamber 34 is filled with gas, it becomes difficult to collect the lubricating oil. Therefore, the grooves between the protrusions 63 alternate with the lubricating oil collection path so that the gas in the oil storage chamber 34 can be In order to use as a discharge path, at least one of the grooves between the protrusions 63 is provided at a position where a negative pressure is generated by the dynamic pressure of the refrigerant swirling flow, and the gas is filled up with the volume of the oil storage chamber 34 as a result. It is preferable to prevent this.

The description of one embodiment of the present invention is finished above, but the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.
Specifically, a separation chamber 50 that only closes the first recess 52 with the flat surface of the gasket 26 may be formed. In this case, the separation chamber 50 has a frustoconical shape, and the lubricating oil can be efficiently separated from the refrigerant by utilizing the centrifugal force and the gravity acting on the refrigerant by at least the female tapered surface 58, and the gasket 26. The shape can be simplified.

Further, the shape of the separation chamber 50 is not limited to the above-described embodiment, and various shapes are conceivable. If the first and second recesses 52 and 66 are not limited to the truncated cone shape and are recessed, at least the separation chamber 50 is secured. However, the compressor 1 is short in the axial direction and small in the radial direction, and the shape of the rear housing 2 can be simplified.
Further, the present invention is not limited to the scroll type compressor, and can naturally be applied to a reciprocating piston type compressor, a rotary compressor, and the like.

1 Compressor (Scroll compressor)
2 Rear housing (housing)
6 Scroll unit (compression unit)
14 Fixed scroll (compression unit)
14a Back 18 Compression chamber 24 Discharge chamber 26 Gasket 34 Oil storage chamber 48 Discharge port (discharge port)
50 Separation chamber 52 First recess 54 First groove 56 Second groove 58 Female taper surface 63 Projection 66 Second recess 68 Refrigerant ejection hole (ejection hole)
70 Oil introduction hole (introduction hole)
72 Female taper surface 76 Bottom 78 Refrigerant ejection path (ejection path)
80 Oil introduction route (introduction route)

Claims (10)

A compression unit that forms a compression chamber for a working fluid containing lubricating oil;
A housing including a suction chamber for the working fluid formed between the compression unit and the suction chamber, the compression unit, and a discharge chamber and a discharge port for the working fluid sequentially connected through the compression chamber;
A first recess is provided downstream of the discharge chamber and upstream of the discharge port as viewed in the direction of flow of the working fluid, and is recessed in the back surface of the compression unit. A separation chamber to separate;
And a gasket positioned between the back surface and the discharge port, sealing the discharge chamber and outside air, and closing the first recess to define the separation chamber. Machine.   The back surface has a first groove that is recessed from the first recess toward the discharge chamber, and the discharge chamber and the separation chamber communicate with each other by closing the first groove with the gasket. The compressor according to claim 1, further comprising an ejection path for the working fluid defined in the operation path.   2. The compressor according to claim 1, wherein the gasket includes an ejection hole for the working fluid that communicates the separation chamber and the discharge port. An oil storage chamber for storing the lubricating oil separated from the working fluid in the housing;
The back surface has a second groove that is recessed from the first recess toward the oil storage chamber, and the oil storage chamber and the separation chamber are communicated by closing the second groove with the gasket. The compressor according to claim 1, further comprising an introduction path for the lubricating oil defined in the section.   The compressor according to claim 4, wherein the gasket includes an introduction hole for the lubricating oil that communicates the discharge port and the introduction path.   3. The compressor according to claim 2, wherein the ejection path is opened to the separation chamber along an outer tangent line of the separation chamber and upward from the horizontal.   5. The compressor according to claim 4, wherein the introduction path is opened to the separation chamber so as to face a swirling flow of the working fluid in the separation chamber and upward from the horizontal.   5. The compressor according to claim 4, wherein the introduction path includes a plurality of protrusions extending along an outer tangent line of the separation chamber and extending upward from the horizontal.   The gasket has a second recess opening toward the first recess with a surface including the ejection hole as a bottom, and the separation chamber is defined by closing the first recess with the second recess. The compressor according to claim 3, wherein The first recess and the second recess are each formed in a truncated cone shape having a female tapered surface,
The compressor according to claim 9, wherein the separation chamber has a shape in which large-diameter ends forming a truncated cone shape of the first recess and the second recess are combined.

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