JP2015124770A - Suction throttle mechanism of compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve a structure capable of enlarging an opening area of a communication passage.SOLUTION: A suction throttle mechanism of a compressor includes a valve element 52, a valve seat 54 and a valve housing 58. The valve housing 58 and the valve seat 54 are formed separately, and the valve housing and the valve seat are separated from each other. Guide parts 58b and 58d for moving the valve element in an approaching and separating direction by slidably contacting with the valve element 52 are provided in the valve housing 58. When the valve element 52 is separated from the valve seat 54, fluid flowing toward the valve element from a suction port through the valve seat passes between the valve seat 54 and the valve housing 58 and flows into a suction chamber.

Description

  The present invention relates to a suction throttle mechanism of a compressor.

  A variable capacity compressor that controls the discharge capacity is known. Such a compressor includes a suction throttle mechanism. The suction throttle mechanism is provided in the suction passage between the suction port and the suction chamber. The suction throttle mechanism changes the opening degree of the suction passage. When the flow rate of the refrigerant to be sucked is small, abnormal noise due to pulsation is likely to occur. The suction throttle mechanism suppresses the occurrence of pulsation by changing the opening of the suction passage in accordance with the flow rate of the refrigerant to be sucked.

  As disclosed in Patent Documents 1 to 3 below, a general suction throttle mechanism of a compressor includes a valve body (spool) that opens and closes a suction passage, and a cylindrical guide means (housing) that guides the valve body. Etc.). When the valve body reciprocates, the valve body is guided by the guide means. When the valve body is separated from the valve seat and opens the valve hole, the suction port and the suction chamber communicate with each other through the suction passage. The opening degree of the suction passage is adjusted according to the displacement amount (lift amount) of the valve body.

JP 2008-196465 A JP 2006-207465 A JP 2000-136776 A

  The compressor disclosed in Patent Literature 1 includes a housing, a suction passage penetrating the housing, and a suction throttle valve disposed inside the suction passage. The suction throttle valve includes a cylindrical valve housing and a valve body that is disposed in an inner space (valve chamber) of the valve housing and reciprocates while sliding on the inner peripheral surface of the valve housing. A communication passage (through hole) for communicating the valve chamber and the suction chamber is also provided in the side wall of the valve housing. The refrigerant flowing into the valve chamber from the suction port through the valve hole flows to the suction chamber side through the communication path. In addition to the function of guiding the valve body, the valve housing has a function of forming a communication path.

  Under such a configuration, increasing the opening area of the communication path means increasing the size of the through hole provided in the guide means such as the valve housing, and this is the valve body of the guide means. It is also to reduce the size of the portion (side wall) that guides. The portion of the guiding means that guides the valve element acts as a resistance against the flow of the refrigerant, but needs to have a certain strength or more. Conventionally, it has been difficult to reduce the size of the portion of the guiding means that guides the valve body, that is, to increase the opening area of the communication path.

  An object of the present invention is to provide a suction throttle mechanism for a compressor having a structure capable of increasing the opening area of a communication passage.

A suction throttle mechanism for a compressor according to the present invention is disposed in a suction passage between a suction port and a suction chamber of the compressor, and has a valve seat formed in a cylindrical shape so that fluid passes through the suction passage. A valve body that adjusts the opening degree of the suction passage by moving in a direction toward and away from the valve seat in the passage, and a bias that biases the valve body in a direction in which the valve body approaches the valve seat A valve housing for accommodating a member, wherein the valve housing and the valve seat are formed as separate bodies, and the valve housing and the valve seat are spaced apart from each other. And a guide part for moving the valve body in the contact / separation direction by sliding contact with the valve body, and when the valve body is separated from the valve seat, the valve body passes through the valve seat from the suction port to the valve body. The fluid flowing toward the valve seat and the valve housing It passes between flows into the suction chamber.

  Preferably, the valve body is formed with a through hole provided in a direction in which the valve body is in contact with and away from the valve seat, and the guide portion is inserted into the through hole. It includes a column portion that guides the valve body by sliding contact with the peripheral surface.

  Preferably, the tip end portion of the column portion extends into the valve seat. Preferably, the tip end portion of the column portion has a tapered shape that tapers from the side farther from the valve seat toward the side closer to the valve seat.

  Preferably, the biasing member is a coil spring, and the column portion extends to the inner peripheral side of the coil spring.

  Preferably, a valve chamber is formed by the valve housing, the valve body, and the column portion, and a vent hole that allows the valve chamber to communicate with the suction chamber is formed in the valve housing.

  Preferably, the valve body includes a disk portion facing the valve seat, and a cylindrical portion extending from the disk portion in the contact / separation direction of the valve body.

  Preferably, the guide portion includes a peripheral wall portion that guides the valve body by slidingly contacting an outer peripheral surface of the valve body.

  Preferably, the suction passage is formed to be bent in a substantially L shape, and the valve seat and the valve housing are fitted into a bent portion of the suction passage so as to face each other. And protruding from the wall surface forming the suction passage.

  ADVANTAGE OF THE INVENTION According to this invention, the structure which can enlarge the opening area of a communicating path is realizable.

FIG. 2 is a cross-sectional view showing a compressor provided with a suction throttle mechanism in the first embodiment. FIG. 3 is a cross-sectional view showing the suction throttle mechanism (closed state) in the first embodiment. FIG. 3 is a perspective view schematically showing a suction throttle mechanism (open state) in the first embodiment. FIG. 3 is a cross-sectional view showing a suction throttle mechanism (fully opened state) in the first embodiment. It is arrow sectional drawing along the IV-IV line in FIG. It is sectional drawing which shows the suction throttle mechanism (fully opened state) in a comparative example. It is arrow sectional drawing along the VII-VII line in FIG. FIG. 10 is a cross-sectional view showing a suction throttle mechanism (closed state) in the second embodiment. FIG. 10 is a cross-sectional view showing a suction throttle mechanism (closed state) in the third embodiment. FIG. 10 is a perspective view schematically showing a suction throttle mechanism (open state) in the fourth embodiment.

Hereinafter, embodiments will be described with reference to the drawings. When referring to the number, amount, etc., the scope of the present invention is not necessarily limited to the number, amount, etc., unless otherwise specified. The same parts and corresponding parts are denoted by the same reference numerals, and redundant description may not be repeated.

[Embodiment 1]
(Compressor 100)
FIG. 1 is a sectional view showing a variable capacity swash plate compressor 100 (hereinafter referred to as a compressor). A suction throttle mechanism 50 (hereinafter referred to as a suction throttle mechanism 50) of the compressor of the present embodiment is provided in the compressor 100 (details will be described later). The compressor 100 includes a housing 11 that forms an outer shell of the compressor 100. The housing 11 includes a cylinder block 12, a front housing 13, and a rear housing 14.

  A front housing 13 is joined to the front side of the cylinder block 12, and a rear housing 14 is joined to the rear side of the cylinder block 12. The cylinder block 12, the front housing 13 and the rear housing 14 are fixed by bolts 15 that pass from the front housing 13 to the rear housing 14.

  A crank chamber 16 is formed inside the front housing 13. The rear side of the crank chamber 16 is closed by the cylinder block 12. A drive shaft 17, a lug plate 21 and a swash plate 22 are provided in the crank chamber 16. The drive shaft 17 passes through the vicinity of the center of the crank chamber 16 and extends in the front-rear direction.

  The drive shaft 17 is rotatably supported by a radial bearing 18 provided on the front housing 13 and a radial bearing 19 provided on the cylinder block 12. A shaft sealing mechanism 20 is provided in front of the radial bearing 18. The shaft sealing mechanism 20 is in sliding contact with the outer peripheral surface of the drive shaft 17. The front end of the drive shaft 17 is connected to an external drive source via a power transmission mechanism (not shown).

  The lug plate 21 in the crank chamber 16 is fixed to the drive shaft 17 and rotates integrally with the drive shaft 17. The swash plate 22 is disposed behind the lug plate 21. A hinge mechanism 23 is provided between the lug plate 21 and the swash plate 22. The swash plate 22 constitutes a capacity changing mechanism and is supported so as to be slidable and tiltable along the axial direction of the drive shaft 17. The swash plate 22 is connected to the lug plate 21 and the drive shaft 17 through a hinge mechanism 23 so as to be capable of synchronous rotation and tilting.

  A coil spring 24 and a cylindrical body 25 are provided between the lug plate 21 and the swash plate 22. The cylindrical body 25 is slidable with respect to the drive shaft 17 and is urged rearward by a coil spring 24. The swash plate 22 is always pressed by the coil spring 24 and the cylindrical body 25 in the direction in which the inclination angle of the swash plate 22 decreases. The inclination angle of the swash plate 22 is an angle formed by a plane perpendicular to the drive shaft 17 and the swash plate 22.

  The posture (position) of the swash plate 22 when the swash plate 22 forms the maximum inclination angle is determined by the front end portion 22 a of the swash plate 22 coming into contact with the lug plate 21. A coil spring 27 and a retaining ring 26 are provided behind the swash plate 22. The retaining ring 26 is attached to the drive shaft 17. The posture (position) of the swash plate 22 when the swash plate 22 forms the minimum inclination angle is determined by the swash plate 22 coming into contact with the coil spring 27. In FIG. 1, a swash plate 22 indicated by a solid line forms a maximum inclination angle, and a swash plate 22 indicated by a virtual line forms a minimum inclination angle.

A plurality of cylinder bores 12 a are formed inside the cylinder block 12. Each cylinder bore 12a accommodates a single-headed piston 28. A concave portion 28 a is formed in the neck portion of each piston 28. A pair of shoes 29a and 29b are accommodated in the recess 28a. The outer peripheral portion 22b of the swash plate 22 is disposed between the shoes 29a and 29b. As the drive shaft 17 rotates, the swash plate 22 rotates in synchronization with the drive shaft 17. The swash plate 22 swings, and each piston 28 reciprocates in the cylinder bore 12a in the front-rear direction via the shoes 29a and 29b.

  On the other hand, the rear side of the cylinder block 12 and the front side of the rear housing 14 are joined via a valve plate 31. The valve plate 31 is provided with a suction port 31a and a discharge port 31b. A suction chamber 32 is formed on the center side in the rear housing 14. A discharge chamber 33 is formed on the outer peripheral side in the rear housing 14. The suction chamber 32 communicates with the compression chamber 30 in the cylinder bore 12a through the suction port 31a, and the discharge chamber 33 communicates with the compression chamber 30 in the cylinder bore 12a through the discharge port 31b.

  The suction port 31a and the discharge port 31b are provided with a suction valve 31c and a discharge valve 31d, respectively. When the piston 28 moves from the top dead center position to the bottom dead center position, the refrigerant gas in the suction chamber 32 is sucked into the compression chamber 30 through the suction port 31a. The refrigerant gas sucked into the compression chamber 30 is compressed when the piston 28 moves from the bottom dead center position to the top dead center position, and is discharged to the discharge chamber 33 through the discharge port 31b.

  A capacity control valve 34 is disposed in the rear housing 14. The capacity control valve 34 changes the inclination angle of the swash plate 22. Specifically, the capacity control valve 34 is disposed in the middle of an air supply passage 35 that connects the crank chamber 16 and the discharge chamber 33. In the cylinder block 12, an extraction passage 36 that connects the crank chamber 16 and the suction chamber 32 is formed.

  The amount of high-pressure refrigerant gas introduced from the discharge chamber 33 into the crank chamber 16 as the valve opening of the capacity control valve 34 is adjusted, and is led out from the crank chamber 16 to the suction chamber 32 through the bleed passage 36. The pressure in the crank chamber 16 is determined by a balance with the amount of refrigerant gas derived. The inclination angle of the swash plate 22 is changed by changing the pressure difference between the crank chamber 16 and the compression chamber 30. By changing the inclination angle of the swash plate 22, the stroke amount of the piston 28 is adjusted, and the discharge capacity of the compressor 100 is also adjusted.

(Suction passage 38)
The rear housing 14 is provided with a suction passage 38 for taking in the refrigerant gas. The suction passage 38 is formed to be bent in a substantially L shape, and a suction port 37 is provided at the inlet portion of the suction passage 38. The suction port 37 is connected to the low pressure side of an external refrigerant circuit (not shown). The refrigerant gas is drawn from the external refrigerant circuit toward the suction chamber 32 through the suction port 37 and the suction passage 38. A suction throttle mechanism 50 for changing the opening degree of the suction passage 38 is provided in the middle of the suction passage 38.

  FIG. 2 is a cross-sectional view showing the suction throttle mechanism 50 (closed state), the suction passage 38, and the like. FIG. 3 is a perspective view schematically showing the suction throttle mechanism 50 (open state). FIG. 4 is a cross-sectional view showing the suction throttle mechanism 50 (fully opened state), the suction passage 38, and the like. FIG. 5 is a cross-sectional view taken along line IV-IV in FIG.

  As shown in FIG. 2, the suction passage 38 is a space formed by hollowing out a part of the rear housing 14, and a portion (columnar space that extends in a columnar shape from the suction port 37 side toward the bottom 38 a. )have. The rear housing 14 is further provided with a cut-out portion 42 so that the cylindrical space communicates with the suction chamber 32. The suction passage 38 has a substantially L-shape due to the cylindrical space and the cut-out portion 42.

  The hollowed portion 42 is a part of the rear housing 14 (circular shape) that exists in a wall shape between a portion (columnar space) extending in a columnar shape from the suction port 37 side toward the bottom 38 a and the suction chamber 32. It is formed by making a hole penetrating from the suction chamber 32 side toward the columnar space side in a portion corresponding to the side wall of the columnar space. The cylindrical space may be provided in the rear housing 14 after the suction chamber 32 and the cutout portion 42 are provided in the rear housing 14.

  The cut-out portion 42 is a space extending in a columnar shape from the suction chamber 32 side toward the bottom portion 42a, and this space is a columnar space (a portion extending in a columnar shape from the suction port 37 side toward the bottom portion 38a). ). The cut-out portion 42 is formed so as to reach a position passing through the portion where the cylindrical space is formed from the suction chamber 32 side. In a state where the suction throttle mechanism 50 is attached to the suction passage 38 (in the state shown in FIG. 2), the bottom portion 42a of the hollow portion 42 is separated from the suction throttle mechanism 50 (the valve housing 58 and the like) (see FIG. 5). The bottom portion 42a of the cut-out portion 42 faces the suction throttle mechanism 50 with a space therebetween.

(Suction throttle mechanism 50)
As shown in FIGS. 2 and 3, the suction throttle mechanism 50 disposed in the suction passage 38 includes a valve body 52, a valve seat 54, a coil spring 56 (FIG. 2), and a valve housing 58. The valve seat 54 and the valve housing 58 are fitted into the bent portion of the suction passage 38 so as to face each other.

(Valve seat 54)
The valve seat 54 has a cylindrical shape centered on the axis X <b> 1 and is disposed in the suction passage 38 between the suction port 37 and the suction chamber 32 of the compressor 100. A valve hole 54h is formed inside the valve seat 54, and the refrigerant passes through the valve hole 54h (inside the valve seat 54). A seat surface 54 b is formed at the lower end of the valve seat 54. The seating surface 54b is located on a plane parallel to the plane orthogonal to the axis X1. The seat surface 54 b is provided on the suction port 37 side of the valve body 52, and restricts the movement of the valve body 52 displaced to the suction port 37 side. Four locking pieces 54 a are provided at the upper end of the valve seat 54.

  With the O-ring 55 (FIG. 2) fitted around the valve seat 54, the valve seat 54 moves from a position far from the suction port 37 to a direction closer to the suction port 37 (from the bottom to the top in FIG. 2). (Towards) inserted into the suction passage 38. A recess corresponding to the locking piece 54 a is provided on the inner peripheral surface of the rear housing 14 forming the suction passage 38. When the locking piece 54 a is locked in the recess, the valve seat 54 is prevented from coming off from the rear housing 14. In this state, the lower end portion of the valve seat 54 protrudes from the inner peripheral surface (wall surface) of the rear housing 14 to which the valve seat 54 is fixed toward the bottom portion 38a of the suction passage 38. 54 b is located in the cut-out portion 42.

(Valve housing 58)
The valve housing 58 is a member formed separately from the valve seat 54, and includes a cylindrical part 58a, a peripheral wall part 58b (guide part), a disk part 58c, and a column part 58d (guide part). The cylindrical portion 58a and the peripheral wall portion 58b have a cylindrical shape centered on the axis X1. The peripheral wall 58b has a shape extending from a side far from the valve seat 54 toward a side close to the valve seat 54 along a direction parallel to the direction in which the axis X1 extends.

The peripheral wall portion 58b is disposed so as to surround the outer peripheral surface 52s of the valve body 52 from the outside. The peripheral wall portion 58b slides on the outer peripheral surface 52s of the valve body 52 to move the valve body 52 in the contact / separation direction (arrow AR direction shown in FIG. 3). The cylindrical portion 58a is located closer to the bottom 38a of the suction passage 38 than the peripheral wall portion 58b. The cylindrical portion 58a is provided with a punch hole 58h.

  A valve chamber is formed inside the valve housing 58 (the cylindrical portion 58a, the peripheral wall portion 58b, the disc portion 58c, and the column portion 58d) and the valve body 52. The hole 58h allows the valve chamber and the suction chamber 32 to communicate with each other. By changing the opening area of the hole 58h and the spring constant of the coil spring 56, the force required for the refrigerant to push down the valve body 52 and open the suction passage 38 is adjusted. The disc part 58c closes the lower end of the cylindrical part 58a. Four locking pieces 58f are provided on the outer periphery of the disk portion 58c.

  The column part 58d has a cylindrical shape. The column part 58d is provided on the disk part 58c, and extends along the axis X1. The front end portion 58e of the column portion 58d has a tapered shape that tapers from the side farther from the valve seat 54 toward the side closer to the valve seat 54. The column portion 58d has a function of guiding the valve body 52 that moves in the contact / separation direction.

  Specifically, the column portion 58d is inserted into a through-hole 52h (described later) formed in the valve body 52, and is in sliding contact with an inner peripheral surface forming the through-hole 52h of the valve body 52. While guiding the body 52, the valve body 52 is moved in the contact / separation direction (arrow AR direction shown in FIG. 3). The column portion 58d of the present embodiment is configured integrally with the disc portion 58c as a part of the valve housing 58, but the column portion 58d may be configured of a separate member independent of the valve housing 58. .

  With the O-ring 57 (FIG. 2) fitted around the valve housing 58 (cylindrical portion 58a), the valve housing 58 moves from a position closer to the suction port 37 to a position farther from the suction port 37 (in FIG. 2). Into the bottom 38a side of the suction passage 38 (from top to bottom). A recess corresponding to the locking piece 58f is provided on the inner peripheral surface of the rear housing 14 forming the suction passage 38. When the locking piece 58 f is locked in the recess, the valve housing 58 is prevented from coming off from the rear housing 14.

  In this state, the valve housing 58 and the valve seat 54 are separated from each other. The upper end portion of the valve housing 58 (the peripheral wall portion 58b) protrudes from the inner peripheral surface of the rear housing 14 where the valve housing 58 is fixed toward the suction port 37 side of the suction passage 38. The front end portion 58e of the column portion 58d extends to a position reaching the valve hole 54h of the valve seat 54. The circumferential wall 58b of the valve housing 58 is separated from the valve seat 54 in the direction in which the axis X1 extends (the direction in which the valve body 52 is in contact with and away from). The upper end (referred to as guide end portion 58 t) of the peripheral wall portion 58 b of the valve housing 58 is located in the cutout portion 42. The guide end portion 58t is a portion located closest to the valve seat 54 in the peripheral wall portion 58b (guide wall) in the direction in which the axis X1 extends.

(Valve 52)
The valve body 52 is located on the downstream side of the suction passage 38 with respect to the valve seat 54. The valve body 52 adjusts the opening degree of the suction passage 38 by moving in the suction passage 38 along the direction in which the axis line X1 extends (direction in which the valve seat 54 contacts and separates from the valve seat 54). The valve body 52 includes an outer cylindrical part 52a, a disk part 52b, and an inner cylindrical part 52d. The disc part 52 b faces the valve seat 54. The outer cylindrical portion 52a and the inner cylindrical portion 52d have a cylindrical shape centered on the axis X1, and extend from the disc portion 52b in the contact / separation direction of the valve body 52.

A seal surface 52c is formed at the front end of the disk portion 52b. The seal surface 52c is parallel to a plane orthogonal to the axis X1. When the valve body 52 is displaced forward and the seal surface 52c comes into contact with the seat surface 54b of the valve seat 54, the valve body 52 is seated on the valve seat 54, and the seal surface 52c serves as the valve hole 54h (suction passage 38). Close. A through hole 52h having a shape extending along the direction in which the valve body 52 contacts and separates from the valve seat 54 is formed at the center of the disk portion 52b. The through hole 52h is formed on the inner peripheral surface 52u of the inner cylindrical portion 52d. It is located at the top edge.

  The outer diameter of the outer cylindrical portion 52a (outer peripheral surface 52s) of the valve body 52 is substantially equal to the inner diameter of the peripheral wall portion 58b of the valve housing 58. The inner diameter of the through hole 52h of the valve body 52 and the inner diameter of the inner cylindrical portion 52d (inner peripheral surface 52u) are substantially equal to the outer diameter of the column portion 58d of the valve housing 58. The valve body 52 can move in the contact / separation direction while being guided by both the peripheral wall portion 58b and the column portion 58d of the valve housing 58. In the present embodiment, since the front end 58e of the column part 58d extends into the valve hole 54h of the valve seat 54, the valve body 52 can be used at or near the time when the valve body 52 is seated on the valve seat 54. It is supported by the column part 58d and can move stably from beginning to end. The inner cylindrical part 52d has a shape that hangs down from the lower surface of the disk part 52b. The inner cylindrical portion 52d is not an indispensable structure, but has a certain length or more so that the valve body 52 can move stably when the valve body 52 moves in the contact / separation direction while slidingly contacting the column portion 58d. It is preferable to have.

  A pedestal 53 is provided on the disc portion 58 c of the valve housing 58, and a coil spring 56 (biasing member) is provided between the disc portion 52 b of the valve body 52 and the pedestal 53. The coil spring 56 accommodated in the valve housing 58 urges the valve body 52 in a direction in which the valve body 52 approaches the valve seat 54. A stopper 59 having an annular shape is provided inside the peripheral wall portion 58 b of the valve housing 58. The column portion 58d extends to the inner peripheral side of the coil spring 56, and the valve body 52 can be stably operated by the column portion 58d and the coil spring 56.

  When the valve body 52 rises most and the seal surface 52c of the valve body 52 comes into contact with the seat surface 54b of the valve seat 54, the opening area of the suction passage 38 is minimum (closed state). The valve body 52 shown in FIG. 2 is seated on the valve seat 54, and the suction passage 38 forms a closed state. Here, in the direction in which the axis X1 extends, the portion of the outer peripheral surface 52s of the valve body 52 that is located closest to the valve seat 54 is defined as an outer peripheral end portion 52t. In a state where the valve body 52 is seated on the valve seat 54, the upper end (referred to as a guide end portion 58 t) of the peripheral wall portion 58 b of the valve housing 58 is located farther from the valve seat 54 than the outer peripheral end portion 52 t of the valve body 52. doing.

  Referring to FIG. 4, when the valve body 52 is separated from the valve seat 54, the valve body 52 moves in a space between the valve seat 54 and the peripheral wall portion 58 b of the valve housing 58. The valve body 52 moves in a direction away from the valve seat 54 while being guided by both the peripheral wall portion 58b and the column portion 58d of the valve housing 58. When the valve body 52 is lowered most and the valve body 52 comes into contact with the stopper 59 in the valve housing 58, the opening area of the suction passage 38 becomes maximum (fully opened state). The lower end portion of the valve body 52 shown in FIG. 4 is in contact with the stopper 59, and the suction passage 38 is fully opened. As described above, since the upper end (guide end portion 58t) of the peripheral wall portion 58b of the valve housing 58 is sufficiently separated from the seat surface 54b of the valve seat 54, the seal surface 52c of the valve body 52 and the seat surface of the valve seat 54 are provided. A wide communication passage 39 is formed between 54b and 54b.

  As shown in FIGS. 4 and 5, in a state where the valve body 52 is separated from the valve seat 54, the communication path 39 has a shape that opens over 360 ° along the circumference centered on the axis X <b> 1. ing. When the valve body 52 is separated from the valve seat 54, the refrigerant (fluid) flows from the suction port 37 through the valve hole 54 h of the valve seat 54 and flows toward the valve body 52. At this time, since the tip portion 58e of the column portion 58d has a tapered shape, the refrigerant can flow smoothly along the shape of the tip portion 58e of the column portion 58d, and the column portion 58d becomes a flow of the refrigerant. It is suppressed that it becomes resistance with respect to it.

Thereafter, the refrigerant passes through the communication passage 39 and spreads outward in all directions orthogonal to the axis X1, and continues to the suction chamber 32 while passing between the valve seat 54 and the valve housing 58 (the peripheral wall portion 58b). Can flow into. According to this configuration, it is possible to easily increase the flow rate of the refrigerant by increasing the opening area of the communication path 39, and thus the refrigerant capacity of the compressor 100 can be improved.

  In the present embodiment, the cutout portion 42 is provided in the rear housing 14 to form the communication path 39 that opens over 360 °. Providing the cutout 42 in the rear housing 14 is not an essential configuration. In the case where the hollow portion 42 is not provided in the rear housing 14, a case where the communication path 39 that opens 360 ° is not formed is included. Even in this case, since the column portion 58d and the peripheral wall portion 58b of the valve housing 58 exhibit a guiding function, it is possible to reduce the size of the portion of the guiding means that guides the valve body 52, As a result, the opening area of the communication path (a space corresponding to the communication path 39) can be increased.

[Comparative example]
FIG. 6 is a cross-sectional view showing the suction throttle mechanism 50Z (fully opened state) in the comparative example. FIG. 7 is a cross-sectional view taken along line VII-VII in FIG. The valve housing 58 of the suction throttle mechanism 50Z has a peripheral wall portion 58b connected to the lower end of the valve seat 54. An upper end 58 tz of the peripheral wall portion 58 b of the valve housing 58 is located above the seat surface 54 b of the valve seat 54. In the suction throttle mechanism 50Z, the valve body 52 moves in the contact / separation direction while being guided only by the peripheral wall portion 58b of the valve housing 58.

  A through hole 52k for communicating the suction passage 38 (valve hole 54h) and the suction chamber 32 is provided in the peripheral wall portion 58b. A portion of the peripheral wall portion 58b where the through hole 52k is not provided constitutes a side wall 52w (FIG. 7). When the valve body 52 is separated from the valve seat 54, a communication path 39z is formed between the seal surface 52c of the valve body 52 and the seat surface 54b of the valve seat 54. As shown in FIG. 7, the communication passage 39z is formed only in a portion where the side wall 52w is not provided, and does not have a shape that opens over 360 ° along the circumference centered on the axis X1. .

  The side wall 52w is a part for guiding the valve body 52, but acts as a resistance against the flow of the refrigerant. Since the side wall 52w needs to have a certain strength or more in order to stably guide the valve body 52, the size (surface area) of the side wall 52w is reduced, that is, the opening area of the communication passage 39z is reduced. It is difficult to enlarge.

[Embodiment 2]
With reference to FIG. 8, the suction throttle mechanism 50A according to the second embodiment will be described. FIG. 8 is a cross-sectional view showing the suction throttle mechanism 50A (closed state). In the second embodiment, the position of the upper end (guide end portion 58t) of the peripheral wall portion 58b of the valve housing 58 is positioned on the side of the bottom portion 38a (the side far from the valve seat 54) as compared with the case of the first embodiment described above. doing.

  In the first embodiment described above, the valve body 52 moves in the contact / separation direction while being guided all the time by both the peripheral wall portion 58b and the column portion 58d of the valve housing 58. Also in the second embodiment, the valve body 52 moves in the contact / separation direction while being guided by both the peripheral wall portion 58b and the column portion 58d of the valve housing 58, but the state in which the valve body 52 is seated on the valve seat 54 and its state In the state immediately before, the valve body 52 is not guided by the peripheral wall portion 58 b of the valve housing 58.

Since the position of the upper end (guide end portion 58t) of the peripheral wall portion 58b of the valve housing 58 is located on the side of the bottom portion 38a (the side far from the valve seat 54), the opening area of the communication passage 39 (see FIG. 4). Can be made larger than in the first embodiment. You may employ | adopt the structure that the valve housing 58 is not provided with the surrounding wall part 58b. In this case, the valve body 52 moves in the contact / separation direction while being guided only by the column part 58 d of the valve housing 58. The opening area of the communication passage 39 can be further increased.

[Embodiment 3]
With reference to FIG. 9, the suction throttle mechanism 50B according to the third embodiment will be described. FIG. 9 is a cross-sectional view showing the suction throttle mechanism 50B (closed state). In the third embodiment, the valve housing 58 does not include the column portion 58d. The valve body 52 moves in the contact / separation direction while being guided only by the peripheral wall portion 58 b of the valve housing 58.

  Also in the present embodiment, when the valve body 52 is seated on the valve seat 54, the upper end (guide end portion 58t) of the peripheral wall portion 58b of the valve housing 58 is more seated than the outer peripheral end portion 52t of the valve body 52. Located far from 54. According to this configuration, similarly to the first embodiment, the flow rate of the refrigerant can be easily increased by increasing the opening area of the communication path 39 (see FIG. 4). As a result, the refrigerant of the compressor Ability can be improved.

[Embodiment 4]
With reference to FIG. 10, the suction throttle mechanism 50C according to the fourth embodiment will be described. FIG. 10 is a perspective view schematically showing the suction throttle mechanism 50C (open state). In the first embodiment described above (see FIG. 3), the peripheral wall portion 58b of the valve housing 58 has a cylindrical shape. In the fourth embodiment, the peripheral wall portion 58b of the valve housing 58 has a columnar shape, and the peripheral wall portion 58b is divided into two portions 58b1 and 58b2. An opening 58u is formed between the portions 58b1 and 58b2. Two openings 58u are formed at positions 180 degrees apart in the circumferential direction of the peripheral wall portion 58b. A valve chamber is formed inside the valve housing 58 (the cylindrical portion 58a, the peripheral wall portion 58b, the disc portion 58c, and the column portion 58d) and the valve body 52, and the opening 58u is formed in an inner space (valve of the valve housing 58). Chamber) and the suction chamber 32 are communicated with each other. The opening 58u can serve as a hole 58h (see FIG. 3) in the first embodiment.

  According to this configuration, similarly to the first embodiment, the flow rate of the refrigerant can be easily increased by increasing the opening area of the communication path 39 (see FIG. 4). As a result, the refrigerant of the compressor Ability can be improved.

  As mentioned above, although embodiment based on this invention was described, the content disclosed this time is an illustration and restrictive at no points. 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.

11 Housing, 12 Cylinder block, 12a Cylinder bore, 13 Front housing, 14 Rear housing, 15 Bolt, 16 Crank chamber, 17 Drive shaft, 18, 19 Radial bearing, 20 Shaft seal mechanism, 21 Lug plate, 22 Swash plate, 22a
Front end portion, 22b outer peripheral portion, 23 hinge mechanism, 24, 27 coil spring, 25 cylindrical body, 26 retaining ring, 28 piston, 28a recess, 29a, 29b shoe, 30
Compression chamber, 31 Valve plate, 31a, 37 Suction port, 31b Discharge port, 31c Suction valve, 31d Discharge valve, 32 Suction chamber, 33 Discharge chamber, 34 Capacity control valve, 35
Supply passage, 36 Extraction passage, 38 Suction passage, 38a, 42a Bottom portion, 39, 39z Communication passage, 42 Hollow-out portion, 50, 50A, 50B, 50C, 50Z Suction throttle mechanism, 52 Valve body, 52a Outer cylindrical portion (cylindrical) Part), 52b, 58c disk part, 52c sealing surface, 52d inner cylindrical part (cylindrical part), 52h, 52k, 58h through hole, 52s outer peripheral face, 52t outer peripheral end part, 52u inner peripheral face, 52w side wall, 53 pedestal, 54 Valve seat, 54a, 58f Locking piece, 54b Seat surface, 54h Valve hole, 55, 57 O-ring, 56 Coil spring (biasing member), 58 Valve housing, 58a Cylindrical portion, 58b Peripheral wall portion (guide portion), 58b
1, 58b2 part, 58d pillar part (guide part), 58e tip part, 58t guide end part, 58tz upper end, 58u opening, 59 stopper, 100 swash plate type compressor (compressor), X1 axis.

Claims (9)

A valve seat that is disposed in a suction passage between a suction port and a suction chamber of the compressor, and is formed in a cylindrical shape so that a fluid passes therethrough;
A valve body that adjusts the opening degree of the suction passage by moving in the direction of contact with and away from the valve seat in the suction passage;
A valve housing that houses a biasing member that biases the valve body in a direction in which the valve body approaches the valve seat;
The valve housing and the valve seat are formed as separate bodies, and the valve housing and the valve seat are separated from each other,
The valve housing is provided with a guide portion that moves the valve body in the contact / separation direction by sliding contact with the valve body,
When the valve body is separated from the valve seat, the fluid flowing from the suction port through the valve seat toward the valve body passes between the valve seat and the valve housing, and the suction chamber. Flow into
Compressor suction throttle mechanism. The valve body is formed with a through hole provided in a direction in which the valve body comes in contact with and separates from the valve seat,
The guide portion includes a column portion that is inserted into the through hole and guides the valve body by sliding contact with an inner peripheral surface of the through hole.
The suction throttle mechanism of the compressor according to claim 1. A tip portion of the column portion extends into the valve seat;
A suction throttle mechanism for a compressor according to claim 2. The tip of the column has a tapered shape that tapers from the side farther from the valve seat toward the side closer to the valve seat.
A suction throttle mechanism for a compressor according to claim 2 or 3. The biasing member is a coil spring;
The column portion extends to the inner peripheral side of the coil spring.
The suction throttle mechanism for a compressor according to any one of claims 2 to 4. A valve chamber is formed by the valve housing, the valve body, and the column portion,
The valve housing is formed with a hole for communicating the valve chamber with the suction chamber.
The suction throttle mechanism for a compressor according to any one of claims 2 to 5. The valve body has a disk portion facing the valve seat, and a cylindrical portion extending from the disk portion in the contact / separation direction of the valve body,
The suction throttle mechanism for a compressor according to any one of claims 1 to 6. The guide portion includes a peripheral wall portion that guides the valve body by slidingly contacting an outer peripheral surface of the valve body.
The suction throttle mechanism for a compressor according to any one of claims 1 to 7. The suction passage is formed to be bent in a substantially L shape,
The valve seat and the valve housing are fitted into a bent portion of the suction passage so as to face each other,
The valve seat protrudes from a wall surface forming the suction passage.
The suction throttle mechanism for a compressor according to any one of claims 1 to 8.

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