JP2017180404A - Compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To acquire a compressor capable of making a driving force generated by a motor contribute to compression of a refrigerant with high use efficiency.SOLUTION: A compressor 101 includes: a housing 10 for forming a suction chamber 1C, a discharge chamber 9S and a partition chamber 8A partitioned from each other, inside; a shaft 20 arranged in the housing 10; a motor 30 arranged in the housing 10; and a compression mechanism 40 connected to the shaft 20, and arranged so as to be side by side with the motor 30 in the axial direction in the housing 10. The compression mechanism 40 has a compression chamber, and takes in a refrigerant introduced in the suction chamber 1C into the compression chamber, compresses it and discharges it toward the discharge chamber 9S. The suction chamber 1C stores the motor 30, and is communicated with the partition chamber 8A. One end part 20F in the axial direction of the shaft 20 has a pressure receiving part for receiving the pressure in the suction chamber 1C, and the other end part 20R in the axial direction of the shaft 20 has a pressure receiving part for receiving the pressure in the partition chamber 8A.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a compressor including a motor that drives a compression mechanism.

  As disclosed in Japanese Patent Application Laid-Open No. 2004-360529 (Patent Document 1), a compressor including a motor that drives a compression mechanism is known. The motor and compression mechanism are disposed within the housing along with the shaft. When the motor rotates the shaft, the compression mechanism can compress the refrigerant.

JP 2004-360529 A

  An object of this invention is to provide the compressor which can make the driving force which the motor produced | generated contribute to compression of a refrigerant | coolant with higher use efficiency.

  A compressor according to the present invention includes a housing that forms a suction chamber, a discharge chamber, and a partition chamber that are partitioned from each other, a shaft that is disposed in the housing and has an axially extending shape, and a housing that is disposed in the housing. A motor that rotationally drives the shaft, and a compression mechanism that is connected to the shaft and is arranged in the housing in a line with the motor in the axial direction, and compresses the refrigerant by driving the motor, The compression mechanism has a compression chamber, takes in the refrigerant introduced into the suction chamber and compresses and discharges the refrigerant toward the discharge chamber, and the suction chamber houses the motor, One end portion of the shaft in the axial direction communicates with the compartment and has a pressure receiving portion for receiving the pressure in the suction chamber, and the shaft of the shaft The other end portion in direction has a pressure receiving portion which receives the pressure in the compartment.

  Preferably, in the compressor, the compression mechanism includes a rotor and a plurality of vanes, and the housing has a first shaft hole into which the shaft is inserted, and a cylinder chamber that houses the rotor and the plurality of vanes. A first partition that forms a part of the inner surface of the cylinder chamber, and a second partition that is fixed to the first partition. And a second surface that is located on the opposite side to the first surface in the axial direction and that forms part of the inner surface of the compartment, and penetrates from the first surface toward the second surface, A second shaft hole into which the shaft is inserted, and an oil passage that communicates the discharge chamber and the cylinder chamber, and the lubricating oil supplied from the discharge chamber to the cylinder chamber through the oil passage A portion from the first surface side to the second surface side Selfish flowing between said shaft and said second shaft hole.

  Preferably, in the compressor, the discharge chamber is provided on a side opposite to a side where the cylinder chamber is located with respect to the second partition body in the axial direction, and the housing is disposed in the discharge chamber. The cover body further includes a cover body that is disposed and fixed to the second partition body, the cover body having a cover surface facing the second surface with a space therebetween, and the partition chamber includes the second partition body. Formed between the second surface of the cover body and the cover surface of the cover body, and a communication passage is provided in the second partition body and the first partition body to communicate the suction chamber and the partition chamber. Yes.

  Preferably, in the compressor, when the partition chamber is projected on the cylinder chamber side along the axial direction, a projected image of the partition chamber substantially coincides with an inner peripheral surface of the cylinder chamber, or The outer shape is smaller than the peripheral surface.

  Preferably, in the compressor, the discharge chamber is provided outside in the radial direction of the cylinder chamber.

  Preferably, in the compressor, the housing is further provided with another communication path that communicates the suction chamber and the compartment, and the communication path is located below the shaft in the direction of gravity. The other communication path is located above the shaft in the direction of gravity.

  According to the above configuration, since the pressure acting on both ends in the axial direction of the shaft is substantially the same, the shaft is hardly biased to one side or the other side in the axial direction, and the drive generated by the motor It is possible to contribute to the compression of the refrigerant with higher use efficiency than in the past.

1 is a cross-sectional view showing a compressor 101 in a first embodiment. It is arrow sectional drawing along the II-II line in FIG. FIG. 3 is a cross-sectional view showing the flow of lubricating oil in the compressor 101 of the first embodiment. FIG. 3 is a flowchart showing a flow of lubricating oil in the compressor 101 of the first embodiment. FIG. 4 is a cross-sectional view showing a compressor 102 in a second embodiment. 6 is a cross-sectional view showing a compressor 103 according to Embodiment 3. FIG. FIG. 6 is a cross-sectional view showing a compressor 104 in a fourth embodiment.

[Embodiment]
Hereinafter, embodiments will be described with reference to the drawings. The same parts and corresponding parts are denoted by the same reference numerals, and redundant description may not be repeated.

[Embodiment 1]
(Compressor 101)
FIG. 1 is a cross-sectional view showing a compressor 101 in the first embodiment. 2 is a cross-sectional view taken along line II-II in FIG. In the following description, the left side in FIG. 1 is the front side, the right side in the page is the rear side, the upper side in the page is the upper side, and the lower side in the page is the lower side. The same applies to FIG. These directions are merely used for convenience of explanation, and the mounting posture of the compressor described below is appropriately changed according to the vehicle or the like to be mounted.

  The compressor 101 includes a housing 10, a shaft 20, a motor 30, and a compression mechanism 40. The housing 10 includes a motor housing 1, a chamber forming body 7A (first partition body), a side plate 5 (second partition body), a main housing 9, and a cover body 35 as its constituent elements. Although details will be described later, the housing 10 forms the suction chamber 1C, the discharge chamber 9S, the partition chamber 8A, and the like on the inner side.

(Motor housing 1, shaft 20, motor 30)
The motor housing 1 has a bottom wall 1A and a cylindrical portion 1D, and is formed in a bottomed cylindrical shape as a whole. A suction chamber 1C that also serves as a motor chamber is formed inside the bottom wall 1A and the cylindrical portion 1D.

  The motor 30 includes a stator 15 and a rotor 17 and is disposed inside the motor housing 1 (inside the suction chamber 1C). The stator 15 is fixed to the cylindrical portion 1 </ b> D and is supplied with power through the cluster block 16. The shaft 20 has a shape extending in the axial direction X <b> 1 and is disposed in the motor housing 1. The shaft 20 is coupled to the rotor 17 and is driven to rotate by a motor 30.

  An annular shaft support 1G is provided on the bottom wall 1A of the motor housing 1, and a bearing device 21 is provided inside the shaft support 1G. The bearing device 21 supports the periphery of the one end portion 20F in the axial direction X1 of the shaft 20. A space 1K located in front of the bearing device 21 (one end 20F) in the suction chamber 1C communicates with a space other than the space 1K in the suction chamber 1C. That is, the one end portion 20F in the axial direction X1 of the shaft 20 has a pressure receiving portion that receives the pressure in the suction chamber 1C, and the suction pressure Ps acts on this pressure receiving portion. In the present embodiment, one end portion 20F of the shaft 20 is entirely exposed in the suction chamber 1C, and the pressure receiving portion is constituted by the one end portion 20F of the shaft 20. A part of one end portion 20F of the shaft 20 may be covered with a specific member.

  The cylindrical portion 1D is provided with a suction port 1E that communicates the suction chamber 1C with the outside. The suction port 1E is connected to an evaporator (not shown). An opening 1B and a step portion 1F are provided at the rear end of the cylindrical portion 1D. The rear end of the cylindrical portion 1D is coupled to the main housing 9 via the gasket 22.

(Main housing 9)
The main housing 9 has a bottom wall 9A and a cylindrical portion 9D, and is formed in a bottomed cylindrical shape as a whole. The front end of the cylindrical portion 9 </ b> D is coupled to the motor housing 1 via the gasket 22. The cylindrical portion 9D is formed with a discharge port 9E that connects a discharge chamber 9S described later and the outside. The discharge port 9E is connected to a condenser (not shown). An opening 9B and a stepped portion 9F are formed at the front end of the cylindrical portion 9D. The step portion 1F of the motor housing 1 and the step portion 9F of the main housing 9 sandwich the peripheral edge of the side plate portion 7S of the chamber forming body 7A.

(Chamber forming body 7A)
The chamber forming body 7A includes a side plate portion 7S and a cylinder block portion 7T, and the side plate portion 7S and the cylinder block portion 7T are integrally formed. The side plate portion 7S and the cylinder block portion 7T may be configured as separate bodies. In this case, the side plate portion 7S and the cylinder block portion 7T are combined to form a first partition body.

  The side plate portion 7S is formed in a disc shape. An O-ring 23 is provided between the outer peripheral surface of the side plate portion 7S and the inner peripheral surface of the step portion 9F. In the center of the side plate portion 7S, a first shaft hole 4A into which the shaft 20 is inserted is provided. The first shaft hole 4A passes through the side plate portion 7S from the front surface to the rear surface of the side plate portion 7S and pivotally supports the shaft 20. Plating may be provided on the inner peripheral surface of the first shaft hole 4A. An annular groove 4C (back pressure groove) is recessed in the rear surface of the side plate portion 7S.

  The cylinder block portion 7T is provided on the rear side of the side plate portion 7S. An O-ring 24 is provided between the outer peripheral surface of the cylinder block portion 7T and the inner peripheral surface of the main housing 9, and a discharge chamber 9S is formed between the cylinder block portion 7T and the main housing 9 (bottom wall 9A). Is done. The cylinder block portion 7T, together with the side plate portion 7S and the side plate 5, forms a cylinder chamber 31 for accommodating the compression mechanism 40 (the rotor 41 and the plurality of vanes 53).

  The cylinder block portion 7T is provided with a discharge space 37, a discharge port 37A, and a suction port 33C. The discharge space 37 is recessed in the outer peripheral surface of the cylinder block portion 7T. The discharge space 37 communicates with the cylinder chamber 31 through the discharge port 37A. A reed valve 39 is provided in the discharge space 37.

  A suction passage 4B is provided in the lower part of the side plate part 7S and the cylinder block part 7T in the direction of gravity. The suction passage 4B has a shape extending in the axial direction X1, and connects the suction chamber 1C and the suction port 33C. The suction chamber 1C communicates with the cylinder chamber 31 through the suction passage 4B and the suction port 33C.

  The cylinder block portion 7T is also provided with communication passages 4H and 7H. The communication passage 4H allows the suction passage 4B and the communication passage 5H provided in the side plate 5 to communicate with each other. The suction passage 4B and the communication passages 4H and 5H communicate a compartment 8A and a suction chamber 1C described later. The communication path 7H allows the discharge space 37 and the communication path 5B provided in the side plate 5 to communicate with each other. The communication passages 7H and 5B and the communication passage 35C provided in the cover body 35 connect the discharge space 37 and the discharge chamber 9S.

(Side plate 5)
The side plate 5 (second partition body) is disposed in the main housing 9, and is fixed to the rear surface of the cylinder block portion 7T by bolts 27A and the like. A gap is provided between the outer peripheral surface of the side plate 5 and the inner peripheral surface of the main housing 9. The side plate 5 partitions the cylinder chamber 31 and the discharge chamber 9S. The discharge chamber 9S is provided on the side opposite to the side where the cylinder chamber 31 is located with respect to the side plate 5 in the axial direction X1.

  The side plate 5 has a first surface 5F located on the front side thereof and a second surface 5R located on the opposite side of the first surface 5F in the axial direction X1. The first surface 5 </ b> F forms a part of the inner surface of the cylinder chamber 31. The second surface 5R forms a part of the inner surface of a compartment 8A described later. The discharge chamber 9 </ b> S is formed between the main housing 9 and the second surface 5 </ b> R of the side plate 5.

  In the center of the side plate 5, a second shaft hole 5A into which the shaft 20 is inserted is provided. The second shaft hole 5A passes through the side plate 5 from the first surface 5F of the side plate 5 toward the second surface 5R, and supports the shaft 20 in a pivotal manner. Plating may be provided on the inner peripheral surface of the second shaft hole 5A. An annular groove 5C (back pressure groove) is recessed in the first surface 5F of the side plate 5.

  The second surface 5R of the side plate 5 is provided with a convex portion 5T that protrudes toward the rear side (a cover body 35 described later). The convex portion 5T is formed in a cylindrical shape. The second shaft hole 5A is formed so as to pass through the central portion in the radial direction of the convex portion 5T.

  The side plate 5 is also provided with communication paths 5B and 5H. The communication paths 5B and 5H both penetrate the side plate 5 from the first surface 5F of the side plate 5 toward the second surface 5R. The suction passage 4B and the communication passage 4H provided in the chamber forming body 7A and the communication passage 5H provided in the side plate 5 communicate the compartment chamber 8A and the suction chamber 1C described later. The communication passage 7H provided in the chamber forming body 7A, the communication passage 5B provided in the side plate 5, and the communication passage 35C provided in the cover body 35 communicate the discharge space 37 and the discharge chamber 9S.

  The side plate 5 is also provided with oil flow paths 5M and 5N. The oil channel 5M has a shape extending along the direction of gravity (vertical direction), and the lower end of the oil channel 5M communicates with the bottom of the discharge chamber 9S. The oil flow path 5N is continuous with the upper end of the oil flow path 5M and connects the oil flow path 5M and the annular groove 5C (cylinder chamber 31). The lubricating oil is guided to the annular groove 5C through the oil passages 5M and 5N. The oil channels 5M and 5N function as throttle channels.

(Cover body 35)
The cover body 35 is disposed in the main housing 9 (discharge chamber 9S) and is fixed to the side plate 5 (second surface 5R) by bolts (not shown). A gasket 26 is provided between the cover body 35 and the side plate 5 (second surface 5R). The cover body 35 has a cover surface 35S that faces the second surface 5R of the side plate 5 with a space therebetween.

  A concave portion 35G is formed in a portion of the cover body 35 located inside the gasket 26 in the radial direction. The recess 35G is formed in a cylindrical shape. The recess 35G and the inner peripheral surface 31S of the cylinder chamber 31 have the same diameter. The front surface of the recess 35G constitutes a part of the cover surface 35S. The front surface of the concave portion 35G has a shape that is recessed so as to move away from the second surface 5R and the convex portion 5T toward the rear side. The recess 35G and the inner peripheral surface 31S of the cylinder chamber 31 do not have to have the same diameter, and the diameter of the recess 35G may be smaller than the diameter of the inner peripheral surface 31S of the cylinder chamber 31. The diameter of the recess 35G may be at least larger than the diameter of the other end 20R of the shaft 20.

  A compartment 8 </ b> A is formed between the cover surface 35 </ b> S of the cover body 35, the second surface 5 </ b> R of the side plate 5, and the gasket 26. A region of the second surface 5R of the side plate 5 that includes the rear surface of the convex portion 5T and faces the front surface of the concave portion 35G, and a region of the cover body 35 in which the front surface of the concave portion 35G is formed. The chambers 8A face each other in the axial direction X1. The rear surface of the convex portion 5T and the second shaft hole 5A are exposed in the compartment 8A. The other end 20R of the shaft 20 in the axial direction X1 has a pressure receiving portion that receives the pressure in the compartment 8A, and the pressure receiving portion includes the pressure in the compartment 8A (in this embodiment, suction The pressure is substantially the same as the pressure Ps). In the present embodiment, the other end portion 20 </ b> R of the shaft 20 is entirely exposed in the compartment 8 </ b> A, and the pressure receiving portion is configured by the other end portion 20 </ b> R of the shaft 20.

  The partition chamber 8A is disposed so as to overlap the entire convex portion 5T when viewed from the axial direction X1, and is formed larger than the convex portion 5T. The partition chamber 8A is disposed so as to overlap the entire cylinder chamber 31 when viewed from the axial direction X1. In other words, when the partition chamber 8 </ b> A is projected on the cylinder chamber 31 side along the axial direction X <b> 1, the projected image of the partition chamber 8 </ b> A has an outer shape that substantially matches the inner peripheral surface 31 </ b> S of the cylinder chamber 31. . The compartment 8A may be a projection image smaller than the inner peripheral surface 31S of the cylinder chamber.

  The cover body 35 is provided with a communication path 35C. The communication path 35C penetrates the cover body 35 from the front surface (cover surface 35S) of the cover body 35 toward the rear surface. The communication path 35C allows the discharge space 37 and the discharge chamber 9S to communicate with each other. The cover body 35 is also provided with a rib 35T. When the refrigerant mixed with the lubricating oil collides with the rib 35T, the lubricating oil and the refrigerant (refrigerant gas) are separated.

(Compression mechanism 40)
The compression mechanism 40 is connected to the shaft 20. The compression mechanism 40 is arranged in the housing 10 so as to be aligned with the motor 30 in the axial direction X <b> 1, and compresses the refrigerant by driving the motor 30. The compression mechanism 40 has a compression chamber 30A (FIG. 2), takes in the refrigerant introduced into the suction chamber 1C into the compression chamber 30A, compresses it, and discharges it into the discharge chamber 9S. The compression mechanism 40 includes a rotor 41 and a plurality of vanes 53.

  The shaft 20 is press-fitted into the rotor 41. When the shaft 20 is rotationally driven by the motor 30, the rotor 41 rotates integrally with the shaft 20 in the cylinder chamber 31. A plurality of grooves 41 </ b> C (vane grooves) are formed on the outer peripheral surface 41 </ b> S of the rotor 41. The plurality of vanes 53 are provided inside the plurality of grooves 41C so as to be able to appear and disappear.

  As the rotor 41 rotates, the tips of the vanes 53 come into sliding contact with the inner peripheral surface 31 </ b> S of the cylinder chamber 31. The compression chamber 30A is formed by the inner peripheral surface 31S of the cylinder chamber 31, the rear surface of the side plate portion 7S, the front surface (first surface 5F) of the side plate 5, the outer peripheral surface 41S of the rotor 41, and the vane 53.

  A space between the bottom surface of the vane 53 and the inner peripheral surface of the groove 41C constitutes a back pressure chamber 49C. The back pressure chamber 49C communicates with the discharge chamber 9S through the annular groove 5C and the oil flow paths 5M and 5N. The compressor 101 in the present embodiment is configured as described above.

(Compression operation)
When the motor 30 operates, the shaft 20 rotates. As the rotor 41 rotates in the cylinder block 7 (cylinder chamber 31), the compression chamber 30A in the cylinder chamber 31 repeats expansion and contraction of the volume. Low-pressure refrigerant is sucked into the compression chamber 30A from the suction chamber 1C through the suction passage 4B and the suction port 33C. Thereafter, the refrigerant is compressed in the compression chamber 30A. Thereafter, the high-pressure refrigerant is discharged into the discharge chamber 9S through the discharge port 37A, the discharge space 37, and the communication passages 7H, 5B, and 35C.

(Lubricant oil flow)
With reference to FIG. 3 and FIG. 4, the flow of the lubricating oil in the compressor 101 will be described. As indicated by an arrow AR1, the lubricating oil in the discharge chamber 9S is guided from the discharge chamber 9S into the annular groove 5C through the oil flow paths 5M and 5N.

  Part of the lubricating oil that has reached the annular groove 5C is the cylinder chamber 31 (specifically, a gap between the rear end surface of the rotor 41 and the first surface 5F of the side plate 5) as indicated by an arrow AR2. Through (see FIG. 3), the air is supplied into the second shaft hole 5A (between the inner peripheral surface of the second shaft hole 5A and the outer peripheral surface of the shaft 20). The lubricating oil flows between the inner peripheral surface of the second shaft hole 5A and the outer peripheral surface of the shaft 20 from the first surface 5F side toward the second surface 5R side, and reaches the compartment 8A. The lubricating oil that has reached the compartment 8A reaches the compression chamber 30A (cylinder chamber 31) together with the suction refrigerant through the communication passage 5H, the communication passage 4H, and the suction passage 4B (arrow AR10), and part of the suction chamber 1C. Reach inside.

  The other part of the lubricating oil that has reached the annular groove 5C passes through the back pressure chamber 49C (vane back pressure chamber) and the annular groove 4C (in the first shaft hole 4A) as indicated by an arrow AR3. (Between the inner peripheral surface of the hole 4A and the outer peripheral surface of the shaft 20). Thereafter, as indicated by an arrow AR5, the lubricating oil reaches the suction chamber 1C. The lubricating oil in the annular groove 4C may be supplied into the compression chamber 30A (cylinder chamber 31) (arrow AR9 in FIG. 4). A part of the lubricating oil in the annular groove 5C may be supplied into the compression chamber 30A (cylinder chamber 31) as indicated by an arrow AR4.

(Suction pressure Ps, discharge pressure Pd)
The housing 10 (specifically, the chamber forming body 7A, the side plate 5) of the compressor 101 is provided with communication passages 4H and 5H that allow the suction chamber 1C and the compartment chamber 8A to communicate with each other. Accordingly, the pressure in the suction chamber 1C (suction pressure Ps) is substantially the same as the pressure in the compartment 8A.

(First effect)
As shown by the white arrow in FIG. 1, the discharge pressure Pd acts on the cover body 35 (discharge pressure Pd> suction pressure Ps). The discharge pressure Pd acting on the cover body 35 does not act on a region of the second surface 5R of the side plate 5 that includes the rear surface of the convex portion 5T and faces the front surface of the concave portion 35G. The discharge pressure Pd acting on this region is blocked by the presence of the compartment 8A. As shown by the hatched arrows in FIG. 1, the suction pressure Ps, which is the pressure inside the compartment 8A, acts on this region. On the other hand, the discharge pressure Pd acts on the remaining area of the second surface 5R (the area of the second surface 5R located outside the compartment 8A) through the cover body 35.

  If the compartment 8 </ b> A is not provided between the side plate 5 and the cover body 35, the discharge pressure Pd acts on the entire second surface 5 </ b> R of the side plate 5 via the cover body 35. The second surface 5R of the side plate 5 is pressed toward the compression chamber 30A, and the side plate 5 is easily bent toward the cylinder chamber 31 side (compression chamber 30A side).

  As a result, the thrust clearance between the rear end surface of the rotor 41 and the first surface 5F of the side plate 5 tends to be smaller than the set value. When the load is high, the rear end surface of the rotor 41 and the first surface 5F of the side plate 5 are pressed against each other, which may increase power loss. Although the increase in power loss can be suppressed by increasing the thrust clearance in advance, the refrigerant in the compression chamber 30A is likely to leak at a low load, and thus the volumetric efficiency is likely to be reduced.

  By providing the partition chamber 8A between the side plate 5 and the cover body 35, it is possible to suppress the side plate 5 from being bent toward the cylinder chamber 31 side (compression chamber 30A side). It is possible to reduce the possibility of causing an increase in volume and a decrease in volumetric efficiency.

  In the compressor 101, one end portion 20F in the axial direction X1 of the shaft 20 is exposed in the suction chamber 1C, and the one end portion 20F of the shaft 20 constitutes a pressure receiving portion that receives the pressure in the suction chamber 1C. Yes. Similarly, the other end 20R of the shaft 20 in the same direction is exposed in the compartment 8A, and the other end 20R of the shaft 20 constitutes a pressure receiving part that receives the pressure in the compartment 8A. The pressure in the suction chamber 1C (suction pressure Ps) and the pressure in the compartment 8A are substantially the same. The urging force for moving the shaft 20 toward the front side (side plate portion 7S side) or the rear side (side of the cover body 35) hardly acts on the shaft 20.

  The rotor 41 fixed to the shaft 20 is hardly subjected to a force for moving the rotor 41 to the front side or the rear side, and is less likely to cause an increase in power loss. That is, according to the compressor 101, the driving force generated by the motor 30 can be contributed to the compression of the refrigerant with higher use efficiency.

(Second effect)
In the compressor 101 according to the present embodiment, the lubricating oil reaches the annular groove 5C from the discharge chamber 9S through the oil passages 5M and 5N. A portion of the lubricating oil that has reached the annular groove 5C passes through the cylinder chamber 31 in the second shaft hole 5A (the inner peripheral surface of the second shaft hole 5A and the shaft 20 as shown by the arrow AR2 (FIG. 3)). (Between the outer peripheral surfaces). Specifically, the cylinder chamber 31 referred to here is a gap between the rear end surface of the rotor 41 and the first surface 5F of the side plate 5. The lubricating oil flows between the inner peripheral surface of the second shaft hole 5A and the outer peripheral surface of the shaft 20 from the first surface 5F side toward the second surface 5R side, and reaches the compartment 8A.

  Until the lubricating oil is sucked up from the discharge chamber 9S and supplied between the inner peripheral surface of the second shaft hole 5A and the outer peripheral surface of the shaft 20, the lubricating oil does not pass through a wide space, The lubricating oil hardly separates into an oil component and a gas component. By appropriately supplying the lubricating oil, the extrusion operation of the vane is hardly weakened, chattering and deterioration of the sealing performance of the compression chamber 30A can be suppressed, and the inner peripheral surface of the second shaft hole 5A It is possible to supply sufficient lubricating oil between the outer peripheral surface of the shaft 20.

(Third effect)
The pressure in the compression chamber 30A acts equally on the inner surface located on the front side of the compression chamber 30A (cylinder chamber 31) and on the inner surface located on the rear side of the compression chamber 30A (cylinder chamber 31). The suction pressure Ps acts on the front surface of the chamber forming body 7A, and the compression pressure acts on the rear surface of the chamber forming body 7A (the inner surface located on the front side of the compression chamber 30A). A compression pressure is applied to the front surface (first surface 5F) of the side plate 5 (inner surface located on the rear side of the compression chamber 30A), and the suction pressure Ps is applied to the rear surface (second surface 5R) of the side plate 5. It is working.

  Differential pressure between a member constituting the inner surface located on the front side of the compression chamber 30A (cylinder chamber 31) and a member constituting the inner surface located on the rear side of the compression chamber 30A (cylinder chamber 31) Hardly occurs. Thrust clearance between the inner surface located on the front side of the compression chamber 30A (cylinder chamber 31) and the front end surface of the rotor 41, the inner surface located on the rear side of the compression chamber 30A (cylinder chamber 31), and the rear end surface of the rotor 41 It is possible to reduce the thrust clearance between the two, and it is possible to further reduce the possibility of increasing the power loss and lowering the volume efficiency.

  As described above, the discharge pressure Pd acts on the cover body 35 as indicated by the white arrow in FIG. The discharge pressure Pd acting on the cover body 35 does not act on a region of the second surface 5R of the side plate 5 that includes the rear surface of the convex portion 5T and faces the front surface of the concave portion 35G. The discharge pressure Pd acting on this region is blocked by the presence of the compartment 8A. When the partition chamber 8A is projected on the cylinder chamber 31 side along the axial direction X1, the projected image of the partition chamber 8A has an outer shape that substantially matches the inner peripheral surface 31S of the cylinder chamber 31. The compartment 8 </ b> A is located on the inner side in the radial direction from the bolts and gaskets 26 that fasten the chamber forming body 7 </ b> A, the side plate 5, and the cover body 35. The discharge pressure Pd acts on the region of the second surface 5R located outside the compartment 8A via the cover body 35. The region located outside the compartment 8A in the second surface 5R is used for fastening the chamber forming body 7A, the side plate 5 and the cover body 35 with bolts and for arranging the gasket 26. The discharge pressure Pd acting on the region contributes to the improvement of the fastening force and the sealing performance.

[Embodiment 2]
With reference to FIG. 5, the compressor 102 in Embodiment 2 is demonstrated. The compressor 102 and the compressor 101 in the first embodiment are different in the following points.

  The housing 10 of the compressor 102 (specifically, the chamber forming body 7A and the side plate 5) is further provided with other communication passages 4J and 5J that allow the suction chamber 1C and the compartment chamber 8A to communicate with each other. The communication passages 4H and 5H for communicating the suction chamber 1C and the compartment 8A are located below the shaft 20 in the gravity direction, and the other communication passages 4J and 5J are located above the shaft 20 in the gravity direction. positioned.

  The communication passages 4H and 5H are provided below the shaft 20 in the gravitational direction, and the other communication passages 4J and 5J are provided above the shaft 20 in the gravitational direction. It becomes possible to change more rapidly to substantially the same value as the pressure in 1C (suction pressure Ps). The pressure difference between the member constituting the inner surface located on the front side of the compression chamber (cylinder chamber 31) and the member constituting the inner surface located on the rear side of the compression chamber (cylinder chamber 31) is more It is less likely to occur, and the possibility of increasing power loss and lowering volumetric efficiency can be further reduced. A flow of lubricating oil from the top to the bottom can be formed in the compartment 8A, and the lubricating oil can be more easily circulated.

[Embodiment 3]
With reference to FIG. 6, the compressor 103 in Embodiment 3 is demonstrated. The compressor 103 and the compressor 101 in the first embodiment are different in the following points.

  The housing 10 of the compressor 103 does not have the cover body 35, and the discharge chamber 9 </ b> S is on the outer side in the radial direction of the cylinder chamber 31 (between the cylindrical portion 9 </ b> D of the main housing 9 and the chamber forming body 7 </ b> A). Provided. The compartment 8 </ b> A is formed between the second surface 5 </ b> R of the side plate 5 and the bottom wall 9 </ b> A of the main housing 9.

  The lower end of the oil flow path 5M provided in the side plate 5 is closed by the closing member 28. The chamber forming body 7A is provided with a communication path 4L communicating with the discharge chamber 9S, and the side plate 5 is provided with a communication path 5L communicating with the oil flow path 5M. The discharge chamber 9S and the oil flow path 5M communicate with each other through the communication paths 4L and 5L. As in the case of the first embodiment described above, the suction passage 4B and the communication passage 4H provided in the chamber forming body 7A and the communication passage 5H provided in the side plate 5 communicate the compartment 8A and the suction chamber 1C. .

  Also with the configuration of the compressor 103, the operations and effects in the first embodiment described above (specifically, the first operation effect and the second operation effect described above) can be obtained. According to the configuration of the compressor 103, the size of the compressor 103 in the axial direction X <b> 1 can be shortened because the housing 10 does not include the cover body 35.

[Embodiment 4]
With reference to FIG. 7, the compressor 104 in the fourth embodiment will be described. The compressor 104 and the compressor 103 in the third embodiment are different in the following points.

  In the compressor 103 in the third embodiment, the compartment 8A and the suction chamber 1C are communicated with each other by the suction passage 4B and the communication passage 4H provided in the chamber forming body 7A and the communication passage 5H provided in the side plate 5. To do. In the compressor 104 of the present embodiment, the shaft 20 is provided with a through hole 20H.

  One end of the through hole 20H opens at the other end 20R of the shaft 20, and is exposed in the compartment 8A. In the present embodiment, a portion of the other end portion 20R of the shaft 20 where the through hole 20H is not provided constitutes a pressure receiving portion that receives the pressure in the compartment 8A. The other end of the through hole 20H is opened in the outer peripheral surface of the shaft 20, and is exposed in the suction chamber 1C. The configuration in which the through hole 20H is provided in the shaft 20 is applicable to the above-described first and second embodiments. Even in this configuration, the urging force for moving the shaft 20 toward the front side or the rear side hardly acts on the shaft 20, and the driving force generated by the motor 30 is used for compressing the refrigerant with higher use efficiency. It is possible to contribute.

  An oil separator may be provided in the cover body 35 of the compressor in each of the above embodiments. In the compressor in each of the above embodiments, the inner peripheral surface 31S of the cylinder chamber 31 may not have a perfect circle shape.

  The compressor in each of the above embodiments includes the vane type compression mechanism 40, but is not limited to this, and the idea disclosed in each of the above embodiments is a piston type and scroll type compression mechanism. It is applicable also to the compressor provided with.

  Although the embodiment has been described above, the above disclosure is illustrative in all respects and is not restrictive. The technical scope of the present invention is defined by the terms of the claims, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  1 motor housing, 1A, 9A bottom wall, 1B, 9B opening, 1C suction chamber, 1D, 9D cylindrical part, 1E suction port, 1F, 9F stepped part, 1G shaft support part, 1K space, 4A first shaft hole, 4B Suction passage, 4C, 5C annular groove, 4H, 4L, 5B, 5H, 5L, 7H, 35C communication passage, 4J, 5J other communication passage, 5 side plate (second partition), 5A second shaft hole, 5F 1st surface, 5M, 5N oil flow path, 5R 2nd surface, 5T convex part, 7 cylinder block, 7A chamber formation body (1st division body), 7S side plate part, 7T cylinder block part, 8A division chamber, 9 Main housing, 9E discharge port, 9S discharge chamber, 10 housing, 15 stator, 16 cluster block, 17, 41 rotor, 20 shaft, 20F one end, 20H through hole, 20R, etc. Part, 21 bearing device, 22, 26 gasket, 23, 24 O-ring, 28 closing member, 30 motor, 30A compression chamber, 31 cylinder chamber, 31S inner peripheral surface, 33C suction port, 35 cover body, 35G recess, 35S cover Surface, 35T rib, 37 discharge space, 37A discharge port, 39 reed valve, 40 compression mechanism, 41C groove (vane groove), 41S outer peripheral surface, 49C back pressure chamber, 53 vane, 101, 102, 103, 104 compressor, AR1, AR2, AR3, AR4, AR5, AR9 Arrow, Pd discharge pressure, Ps suction pressure, X1 axial direction.

Claims (6)

A housing that forms a suction chamber, a discharge chamber, and a partition chamber that are partitioned from each other;
A shaft disposed within the housing and having an axially extending shape;
A motor disposed within the housing and configured to rotationally drive the shaft;
A compression mechanism connected to the shaft, arranged in the housing in the axial direction with the motor, and compressing refrigerant by driving the motor,
The compression mechanism has a compression chamber, takes in the refrigerant introduced into the suction chamber and compresses it into the discharge chamber, and discharges it toward the discharge chamber.
The suction chamber accommodates the motor and communicates with the compartment.
One end portion of the shaft in the axial direction has a pressure receiving portion that receives pressure in the suction chamber,
The other end portion in the axial direction of the shaft has a pressure receiving portion that receives pressure in the compartment.
Compressor. The compression mechanism includes a rotor and a plurality of vanes,
The housing is
A first partition body having a first shaft hole into which the shaft is inserted, and forming a cylinder chamber accommodating the rotor and the plurality of vanes inside;
A second compartment fixed to the first compartment,
The second compartment is
A first surface forming part of the inner surface of the cylinder chamber;
A second surface that is located on a side opposite to the first surface in the axial direction and forms a part of the inner surface of the compartment;
A second shaft hole penetrating from the first surface toward the second surface and into which the shaft is inserted;
An oil flow path communicating the discharge chamber and the cylinder chamber,
Part of the lubricating oil supplied from the discharge chamber to the cylinder chamber through the oil flow path is between the shaft and the second shaft hole from the first surface side toward the second surface side. Flowing through the
The compressor according to claim 1. The discharge chamber is provided on the opposite side to the side where the cylinder chamber is located with respect to the second partition body in the axial direction,
The housing further includes a cover body disposed in the discharge chamber and fixed to the second partition body,
The cover body has a cover surface facing the second surface with a space therebetween,
The compartment is formed between the second surface of the second compartment and the cover surface of the cover body,
The second partition body and the first partition body are provided with a communication path that allows the suction chamber and the partition chamber to communicate with each other.
The compressor according to claim 2. When the partition chamber is projected on the cylinder chamber side along the axial direction, the projected image of the partition chamber substantially matches the inner peripheral surface of the cylinder chamber or is smaller in outer shape than the inner peripheral surface have,
The compressor according to claim 3. The discharge chamber is provided outside in the radial direction of the cylinder chamber.
The compressor according to claim 2. The housing is further provided with another communication path for communicating the suction chamber and the compartment.
The communication path is located below the shaft in the direction of gravity,
The other communication path is located above the shaft in the direction of gravity,
The compressor according to claim 3 or 4.

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