WO2018235483A1

WO2018235483A1 - Variable capacity compressor

Info

Publication number: WO2018235483A1
Application number: PCT/JP2018/019428
Authority: WO
Inventors: 田口　幸彦
Original assignee: サンデン・オートモーティブコンポーネント株式会社
Priority date: 2017-06-19
Filing date: 2018-05-15
Publication date: 2018-12-27
Also published as: JP2019002384A

Abstract

According to the present invention, the pressure in a crank chamber increases quickly in a variable capacity compressor. This variable capacity compressor has a control valve 300 configured to control the opening degree of a supply passage for supplying a refrigerant in a discharge chamber to a crank chamber and the opening degree of a discharge passage between the crank chamber and an intake chamber. In the control valve 300, a communication passage 363 for communicating a first valve hole 316 and a second valve hole 320 includes: a cylindrical first communication passage 363a between the inner peripheral surface of a through-hole 364 of a sub valve body 362 of a sub valve body unit 360 and the outer peripheral surface of a main valve body unit 350; and a second communication passage 363b which extends past the outer peripheral surface side of a first sub valve part 362a of the sub valve body 362 and through which a first region S1, serving as a back pressure region, and the first communication passage 363a communicate with each other.

Description

Variable displacement compressor

The present invention relates to a variable displacement compressor in which a discharge displacement changes according to the pressure of a control pressure chamber such as a crank chamber.

A variable displacement compressor described in Patent Document 1 is known as an example of this type of variable displacement compressor. The variable displacement compressor described in Patent Document 1 includes an air supply passage 28 connecting the crank chamber 5 and the discharge chamber 22, a bleed passage 27 connecting the crank chamber 5 and the suction chamber 21, and an air supply passage 28. A first control valve CV1 capable of adjusting the opening degree and a second control valve CV2 capable of adjusting the opening degree of the bleed passage 27 are provided, and the pressure in the crank chamber 5 is controlled by the first control valve CV1 and the second control valve CV2. By controlling, it is constituted so that change of discharge capacity is possible. The second control valve CV2 is incorporated in the valve housing 45 of the first control valve CV1 and integrated with the first control valve CV1.
Specifically, the first control valve CV1 is formed in the valve housing 45 and the valve rod 45 having the valve body 43 that opens and closes the communication passage 47 that constitutes a part of the air supply passage 28, and the valve body 43 is accommodated. Valve chamber 46 and a solenoid section 60 for operating the actuating rod 40. The second control valve CV2 has a bottomed cylindrical spool 82 slidably held in the valve chamber 46. The spool 82 is formed with a hole 82e through which the valve body 43 of the actuating rod 40 is inserted. A communication passage 47, a port 51, and a port 88 are formed in the valve housing 45. One end of the communication passage 47 is connected to the port 52 (pressure region of the discharge chamber 22), and the other end of the communication passage 47 is open to the valve chamber 46. One end of the port 51 is connected to the pressure region of the crank chamber 5, and the other end of the port 51 is open to the valve chamber 46. One end of the port 88 is connected to the pressure area of the suction chamber 21, and the other end of the port 88 is open to the valve chamber 46. When the valve body 43 of the first control valve CV1 opens the communication passage 47, the second control valve CV2 brings the communication passage 47 into communication with the port 51 via the communication passage 86 and causes the communication between the port 51 and the port 88 When the valve body 43 of the first control valve CV1 closes the communication passage 47, the communication between the communication passage 47 and the port 51 is shut off and the port 51 and the ho 88 are communicated. There is.

Japanese Patent Application Laid-Open No. 2002-21721

However, in the variable displacement compressor described in Patent Document 1, the communication passage 86 for connecting the communication passage 47 and the port 51 is a gap between the hole 82 e formed in the spool 82 and the valve body portion 43. It functions as a fixed stop whose passage sectional area is set small. Therefore, even if the valve body 43 of the first control valve CV1 opens the communication passage 47, the refrigerant flow in the air supply passage 28 is squeezed by the communication passage 86 functioning as a fixed throttle, and an amount sufficient for the crank chamber 5 is obtained. Can not supply the refrigerant (gas) of As a result, the pressure increase in the crank chamber 5 becomes slow, and the decrease of the discharge capacity is delayed, which may result in the control of the discharge capacity becoming unstable.
Then, this invention aims at providing the variable displacement compressor which can raise the pressure of control pressure chambers, such as the said crank chamber, more rapidly than before.

According to one aspect of the present invention, a suction chamber to which refrigerant before compression is introduced, a compression unit that compresses the refrigerant in the suction chamber, a discharge chamber to which the refrigerant after compression compressed by the compression unit is discharged, internal pressure Accordingly, the control pressure chamber which changes the discharge capacity by changing the state of the compression unit, and the degree of opening of the supply passage for supplying the refrigerant in the discharge chamber to the control pressure chamber are controlled. A variable displacement compressor is provided having a control valve that controls the degree of opening of a discharge passage connected to a suction chamber. The control valve includes a housing extending in one direction and having an outer peripheral surface, a sub valve body unit, a cylindrical main valve body unit, a solenoid unit, and a pressure sensing device. The housing is a valve chamber, one end is connected to the pressure area of the discharge chamber, the other end is a first valve hole opened to the valve chamber, one end is connected to the pressure area of the control pressure chamber, and the other is the above It has the 2nd valve hole opened to a valve storage chamber, and the discharge internal passage which one end connects to the pressure field of the suction chamber, and the other end opens to the valve storage chamber. The sub valve body unit is provided in the valve storage chamber and operates in accordance with a pressure difference between the front and back, and communicates the first valve hole and the second valve hole, and the second valve hole. The degree of opening of the discharge passage is controlled by switching to a second state in which the discharge internal passage is communicated. The main valve body unit is extended so as to penetrate from one end to the other end of the sub valve body unit, and the first valve hole is formed by coming into contact with the first valve seat around the first valve hole. It has a main valve body that opens and closes. The solenoid unit applies an urging force in the valve closing direction of the first valve hole to the main valve body unit. The pressure sensing device applies an urging force in the valve opening direction of the first valve hole to the main valve body unit in response to an external pressure. The sub valve body unit includes a sub valve body in which an insertion hole for insertion of the main valve body unit is formed, and a communication passage for communicating the first valve hole and the second valve hole. . The sub valve body is disposed so as to surround the outer periphery of the main valve body and to be opposed to the first valve seat, and has a first sub valve portion having an outer peripheral surface in sliding contact with the inner peripheral surface of the valve storage chamber Including. In the sub valve body, when the main valve body is separated from the first valve seat and the pressure in the back pressure region between the first valve seat and the first sub valve portion is increased, the communication passage Communication between the first valve hole and the second valve hole and blocking communication between the second valve hole and the discharge internal passage, and the main valve body abuts on the first valve seat When the pressure in the back pressure region decreases, the communication between the first valve hole and the second valve hole is shut off, and the second valve hole is moved so as to communicate with the discharge internal passage. Do. The communication passage is a cylindrical first communication passage between the inner peripheral surface of the insertion hole of the sub valve body and the outer peripheral surface of the main valve body unit, and the outer peripheral surface side of the first sub valve portion. And a second communication passage extending between the back pressure region and the first communication passage.

In the variable displacement compressor according to the aspect of the present invention, the control valve controls the degree of opening of the supply passage for supplying the refrigerant in the discharge chamber to the control pressure chamber, and the control pressure chamber and the suction chamber Control the opening of the discharge passage connecting the In the control valve, a communication passage for connecting the first valve hole and the second valve hole is formed in the insertion hole of the sub valve body of the sub valve body unit that controls the opening degree of the discharge passage. A cylindrical first communication passage between the circumferential surface and the outer circumferential surface of the main valve body unit, and the back pressure region and the first communication passage extending via the outer circumferential surface side of the first sub valve portion And a second communication passage communicating with each other. That is, the end on the back pressure region side of the communication passage for communicating the first valve hole and the second valve hole is branched into the first communication passage and the second communication passage. Therefore, for example, even when the end portion on the back pressure region side of the first communication passage functions as a cylindrical throttle passage surrounding the main valve body, when the main valve body unit is opened, Since a refrigerant can be supplied from the discharge chamber to the control pressure chamber through the second communication passage in addition to the throttle passage, a sufficient amount of refrigerant is supplied to the control pressure chamber. As a result, the pressure in the control pressure chamber can be quickly increased, and the discharge capacity can be smoothly (rapidly) reduced. As a result, the discharge capacity can be stably controlled.
In this way, it is possible to provide a variable displacement compressor capable of rapidly increasing the pressure in the control pressure chamber.

1 is a cross-sectional view of a variable displacement compressor according to an embodiment of the present invention. It is a sectional view of a control valve of the variable displacement compressor. It is an enlarged view of the principal part in FIG. It is sectional drawing of the assembly of the subvalve body unit and case of the said variable displacement compressor. It is a figure for demonstrating the operation state of the said sub valve body unit, (A) shows the refrigerant supply state (1st state) to a crank chamber, (B) is just after valve closing of the 1st valve hole. A state is shown, and (C) shows a pressure-released state (second state) from the crank chamber. It is an enlarged view of the principal part in FIG. It is principal part sectional drawing which shows the modification of the said control valve. It is principal part sectional drawing which shows another modification of the said control valve.

[Overall configuration of variable displacement compressor]
Hereinafter, embodiments of the present invention will be described based on the attached drawings. FIG. 1 is a cross-sectional view showing a schematic configuration of a swash plate type variable displacement compressor to which the present invention is applied. Although this variable displacement compressor is not particularly limited, it is mainly configured as a clutchless compressor applied to an air conditioner system for a vehicle.
The variable displacement compressor 100 is provided with a cylinder block 101 in which a plurality of cylinder bores 101 a are formed, a front housing 102 provided on one end side of the cylinder block 101, and a valve plate 103 on the other end side of the cylinder block 101. And the cylinder head 104. The cylinder block 101, the front housing 102, the valve plate 103 and the cylinder head 104 are fastened by a plurality of through bolts 105 to constitute a compressor housing.
Further, a crank chamber 140 is formed by the cylinder block 101 and the front housing 102, and a drive shaft 110 is provided so as to cross the crank chamber 140. The drive shaft 110 is rotatably supported by the compressor housing. Although not shown in the drawings, a center gasket is disposed between the front housing 102 and the cylinder block 101, and a cylinder other than the valve plate 103 is disposed between the cylinder block 101 and the cylinder head 104. A gasket, a suction valve forming plate, a discharge valve forming plate and a head gasket are disposed.
A swash plate 111 is disposed around an axial middle portion of the drive shaft 110. The swash plate 111 is connected to a rotor 112 fixed to the drive shaft 110 via a link mechanism 120 and rotates with the drive shaft 110. Further, the swash plate 111 is configured such that an angle (hereinafter referred to as “tilt angle”) with respect to the axis O of the drive shaft 110 can be changed.
The link mechanism 120 includes a first arm 112 a protruding from the rotor 112, a second arm 111 a protruding from the swash plate 111, and one end of the link mechanism 120 with respect to the first arm 112 a via the first connection pin 122. And a link arm 121, the other end of which is rotatably coupled to the second arm 111a via the second coupling pin 123.
The through hole 111b of the swash plate 111 through which the drive shaft 110 is inserted is formed in a shape that allows the swash plate 111 to tilt in the range of the maximum tilt angle and the minimum tilt angle. The through hole 111 b is formed with a minimum inclination restricting portion that abuts on the drive shaft 110. When the inclination angle (minimum inclination angle) of the swash plate 111 when the swash plate 111 is orthogonal to the axis O of the drive shaft 110 is 0 °, the minimum inclination restricting portion of the through hole 111 b has an inclination angle of almost 0 When it becomes °, it abuts on the drive shaft 110, and it is formed to restrict further tilting of the swash plate 111. In addition, when the inclination angle of the swash plate 111 reaches the maximum inclination angle, the swash plate 111 abuts on the rotor 112 and the inclination thereof is restricted.
The drive shaft 110 is provided with an inclination reducing spring 114 for urging the swash plate 111 in a direction to reduce the inclination of the swash plate 111, and an inclination increasing spring 115 for urging the swash plate 111 in a direction to increase the inclination of the swash plate 111. And are worn. The tilt angle reducing spring 114 is disposed between the swash plate 111 and the rotor 112, and the tilt angle increasing spring 115 is mounted between the swash plate 111 and a spring support member 116 fixed to the drive shaft 110.
Here, when the tilt angle of the swash plate 111 is the minimum tilt angle, the biasing force of the tilt angle increasing spring 115 is set to be larger than the biasing force of the tilt angle reducing spring 114, and the drive shaft 110 rotates. When not, the swash plate 111 is positioned at a tilt angle at which the biasing force of the tilt angle reducing spring 114 and the biasing force of the tilt angle increasing spring 115 are balanced.
One end (left end in FIG. 1) of the drive shaft 110 extends through the boss portion 102 a of the front housing 102 to the outside of the front housing 102. The power transmission device (not shown) is connected to the one end of the drive shaft 110. A shaft seal device 130 is provided between the drive shaft 110 and the boss portion 102 a, and the inside of the crank chamber 140 is shut off from the outside by the shaft seal device 130.
The coupling body of the drive shaft 110 and the rotor 112 is supported by bearings 131 and 132 in the radial direction, and supported by the bearing 133 and the thrust plate 134 in the thrust direction. The drive shaft 110 (and the rotor 112) is configured to rotate in synchronization with the rotation of the power transmission device by transmitting power from an external drive source to the power transmission device. The clearance between the other end of the drive shaft 110, that is, the end on the thrust plate 134 side, and the thrust plate 134 is adjusted to a predetermined clearance by the adjustment screw 135.
A piston 136 is disposed in each cylinder bore 101a. The outer space of the swash plate 111 and the vicinity thereof are accommodated in the inner space of the projecting portion of the piston 136 projecting into the crank chamber 140 via the pair of shoes 137, whereby the swash plate 111 Work together. Then, the piston 136 reciprocates in the cylinder bore 101 a by the rotation of the swash plate 111 accompanying the rotation of the drive shaft 110. Further, the stroke amount of the piston 136 changes in accordance with the inclination angle of the swash plate 111.
In the cylinder head 104, a suction chamber 141 is formed substantially at the center, and a discharge chamber 142 is formed to annularly surround the suction chamber 141. The suction chamber 141 communicates with the cylinder bore 101a through a communication hole 103a provided in the valve plate 103 and a suction valve (not shown) formed in the suction valve forming plate (not shown). The discharge chamber 142 is in communication with the cylinder bore 101 a through a discharge valve (not shown) formed in the discharge valve forming plate (not shown) and a communication hole 103 b provided in the valve plate 103.
The suction chamber 141 is connected to the low pressure side of the refrigerant circuit of the air conditioning system (not shown) via the suction passage 104a.
In the upper portion of the cylinder block 101, a muffler 160 is provided to reduce noise and vibration due to pressure pulsation of the refrigerant. The muffler 160 is formed of a muffler forming wall 101 b defined in the upper portion of the cylinder block 101 and a lid member 106 fastened to the muffler forming wall 101 b via a seal member (not shown). In the muffler space 143 in the muffler 160, a check valve 200 is disposed.
The check valve 200 is disposed at an end of the communication passage 144 communicating the discharge chamber 142 with the muffler space 143 on the muffler space 143 side. The check valve 200 operates in response to the pressure difference between the communication passage 144 (upstream side) and the muffler space 143 (downstream side). Specifically, the check valve 200 is configured to shut off the communication passage 144 when the pressure difference is smaller than a predetermined value, and open the communication passage 144 when the pressure difference is larger than the predetermined value. It is done.
The discharge chamber 142 is connected to the high pressure side of the refrigerant circuit of the air-conditioning system via a discharge passage including the communication passage 144, the check valve 200, the muffler space 143, and the discharge port 106a. Further, the backflow of the refrigerant gas from the high pressure side of the refrigerant circuit of the air conditioning system toward the discharge chamber 142 is blocked by the check valve 200.
The low pressure side refrigerant (the refrigerant before compression) of the refrigerant circuit of the air conditioning system is led to the suction chamber 141 via the suction passage 104a. The refrigerant in the suction chamber 141 is sucked into the cylinder bore 101 a by the reciprocating motion of the piston 136, compressed and discharged into the discharge chamber 142. That is, in the present embodiment, the cylinder bore 101 a and the piston 136 constitute a compression unit that compresses the refrigerant in the suction chamber 141. Then, the compressed refrigerant compressed by the compression unit is discharged to the discharge chamber 142, and thereafter, is led to the high pressure side of the refrigerant circuit of the air conditioning system via the discharge passage.
The cylinder head 104 is provided with a control valve 300. The control valve 300 is disposed in a control valve receiving hole 104 b formed in the cylinder head 104.
The control valve 300 disposed in the control valve housing hole 104 b internally has a fluid passage that constitutes a part of the supply passage 145 that supplies the refrigerant (discharged refrigerant) in the discharge chamber 142 to the crank chamber 140. Then, the control valve 300 adjusts (controls) the opening degree (passage cross-sectional area) of the fluid passage (that is, the supply passage 145), thereby controlling the amount of refrigerant supplied from the discharge chamber 142 to the crank chamber 140. It is configured to
Further, a part of the fluid passage constitutes a part of a discharge passage 146 (more specifically, a first discharge passage 146a described later) connecting the crank chamber 140 and the suction chamber 141. The control valve 300 adjusts (controls) the opening degree of the discharge passage 146 by adjusting (controlling) the opening degree (passage cross-sectional area) of a part of the fluid passage, whereby the crank chamber 140 to the suction chamber 141 It is configured to control the discharge amount of the refrigerant to the The supply passage 145, the discharge passage 146, and the control valve 300 will be described in detail later.
Thus, the pressure of the crank chamber 140 can be changed (adjusted) by controlling the amount of refrigerant supplied to the crank chamber 140 and the amount of refrigerant discharged from the crank chamber 140 by the control valve 300. The displacement of the variable displacement compressor 100 can be changed by changing the inclination angle of the swash plate 111, that is, the stroke amount of the piston 136.
Specifically, by changing the pressure in the crank chamber 140, the pressure difference between the front and back of each piston 136, in other words, the pressure difference between the compression chamber in the cylinder bore 101a sandwiching the piston 136 and the crank chamber 140, is used. The inclination angle of 111 can be changed, and as a result, the stroke amount of the piston 136 changes and the displacement of the variable displacement compressor 100 changes. Specifically, when the pressure in the crank chamber 140 is reduced, the inclination angle of the swash plate 111 is increased and the stroke amount of the piston 136 is increased, whereby the displacement of the variable displacement compressor 100 is increased. ing.
In other words, in the variable displacement compressor 100, the crank chamber 140 changes the state of the compression unit (specifically, the stroke amount of the piston 136) according to the internal pressure to change the discharge capacity of the variable displacement compressor 100. It has a function to change. Therefore, in the present embodiment, the crank chamber 140 corresponds to the "control pressure chamber" of the present invention. The control valve 300 is mainly used to control the opening degree of the supply passage 145 and to control the opening degree of the discharge passage 146 to adjust the pressure in the crank chamber 140.
Here, as shown in FIG. 1, five O-rings 300a to 300e are attached to the outer peripheral surface of the control valve 300. The inside of the control valve housing hole 104b is isolated from the external space by the five O-rings 300a to 300e, and the outer space of the control valve 300 in the control valve housing hole 104b is the bottom side of the control valve housing hole 104b. It is divided into a first outer space 104b1, a second outer space 104b2, a third outer space 104b3, and a fourth outer space 104b4 in order from (the pressure-sensitive device 330 side of the control valve 300 described later).
The first outer space 104b1 communicates with the suction chamber 141 via a communication passage 104c formed in the cylinder head 104. Therefore, the pressure Ps of the suction chamber 141 acts on the first outer space 104b1. The second outer space 104 b 2 communicates with the discharge chamber 142 through a communication passage 104 d formed in the cylinder head 104. Therefore, the pressure Pd of the discharge chamber 142 acts on the second outer space 104b2. The third outer space 104 b 3 communicates with the suction chamber 141 via a communication passage 104 e formed in the cylinder head 104. Therefore, the pressure Ps of the suction chamber 141 acts on the third outer space 104b3. The fourth outer space 104b4 communicates with the crank chamber 140 through a communication passage 104f formed in the cylinder head 104, a through hole formed in the valve plate 103, and a communication passage 101c formed in the cylinder block 101. Therefore, the pressure Pc of the crank chamber 140 acts on the fourth outer space 104b4.
[Supply passage]
Next, the supply passage 145 will be described. In the present embodiment, the supply passage 145 includes the communication passage 104 d, the second outer space 104 b 2, the fluid passage (described in detail later) inside the control valve 300, the fourth outer space 104 b 4, the communication passage 104 f, and the valve. It is comprised by the said through hole of the plate 103, and the channel | path which passes through the communicating channel 101c. The supply passage 145 is opened and closed by the control valve 300 via the inside of the control valve 300.
[Discharge passage]
Next, the discharge passage 146 will be described. In the present embodiment, the discharge passage 146 includes a first discharge passage 146a and a second discharge passage 146b.
The first discharge passage 146a includes the communication passage 101c, the through hole of the valve plate 103, the communication passage 104f, the fourth outer space 104b4, a part of the fluid passage inside the control valve 300 (details will be described in detail later), The control valve 300 includes a second valve chamber 328, which will be described later, and a discharge internal passage 326, which is described later, of the control valve 300, a third outer space 104b3, and a passage passing through the communication passage 104e. The first discharge passage 146 a is opened and closed by the control valve 300 via the inside of the control valve 300. As the first discharge passage 146 a is opened and closed by the control valve 300, the opening degree of the discharge passage 146 is adjusted.
Here, the communication passage 101c, the through hole of the valve plate 103, the communication passage 104f, the fourth outer space 104b4, and a part of the fluid passage inside the control valve 300 (hereinafter, these are collectively ") Serves as the first discharge passage 146a and the supply passage 145. In this shared passage, the refrigerant flow direction when discharging the refrigerant from the crank chamber 140 (when functioning as the discharge passage 146) and when supplying the refrigerant to the crank chamber 140 (when functioning as the supply passage 145) Is reversed.
Further, in the present embodiment, the second discharge passage 146 b is a communication passage 101 d extending through the end surface of the cylinder block 101 on the front housing 102 side and extending toward the cylinder head 104, and is open at the end surface of the cylinder block 101 on the cylinder head 104 And a fixed stop 103 c formed in the valve plate 103. The second discharge passage 146 b is provided to bypass the control valve 300, and constantly communicates the crank chamber 140 with the suction chamber 141. The flow passage cross-sectional area of the first discharge passage 146a when opened by the control valve 300 is set larger than the flow passage cross-sectional area of the fixed throttle 103c of the second discharge passage 146b.
[Control valve]
Next, the control valve 300 will be described in detail with reference to FIGS. 2 and 3. FIG. 2 is a cross-sectional view of the control valve 300, and FIG. 3 is an enlarged view of the main part in FIG.
As shown in FIG. 2, the control valve 300 includes a valve housing 310, a pressure sensing device 330, a solenoid unit 340, a main valve unit 350, and a sub valve unit 360.
[Valve housing]
The valve housing 310 includes a substantially cylindrical valve body 311 and a bottomed cylindrical cap member 312 fixed to one end (the end opposite to the solenoid unit 340 side) of the valve body 311. In the present embodiment, the valve housing 310 and a solenoid housing 341 described later of the solenoid unit 340 form a control valve housing having an outer peripheral surface that extends in one direction by being fitted to each other. In the present embodiment, the control valve housing (310, 341) corresponds to the "housing" according to the present invention.
The cap member 312 cooperates with a recess 311 a formed on one end face of the valve body 311 to form a pressure sensitive chamber 313. The pressure sensing chamber 313 is in communication with a space to which an external pressure acts via a communication hole 312 a formed on the side surface of the cap member 312. More specifically, in the present embodiment, the external pressure is the pressure Ps of the suction chamber 141, and the pressure sensing chamber 313 is in communication with the first outer space 104b1 where the pressure Ps of the suction chamber 141 acts via the communication hole 312a. There is.
A fitting hole 314, a first valve chamber 315, a first valve hole 316 and an insertion hole 317 are formed in the valve body 311 sequentially from the other end surface (end surface on the solenoid unit 340 side) 311b side. The fitting hole 314, the first valve chamber 315, the first valve hole 316, and the insertion hole 317 are disposed on the center line X of the valve body 311 in the extending direction (= the center line of the control valve 300).
The fitting hole 314 is formed as a cylindrical hole opened to the other end surface 311 b of the valve body 311. The fitting hole 314 includes, for example, an enlarged diameter portion whose diameter on the side of connection with the first valve chamber 315 is increased by centering or the like and a smaller diameter fitting portion than the diameter enlarged portion. Is formed. In the fitting hole 314, a bottomed cylindrical case 318 including a cylindrical peripheral wall 318a and an end wall 318b provided at one end of the peripheral wall 318a is fitted. Specifically, in the case 318, a portion on the end wall 318b side of the peripheral wall 318a is fitted to the end on the enlarged diameter portion side in the fitting portion of the fitting hole 314, and the tip of the peripheral wall 318a is the fitting hole 314 Contact with the inner bottom surface (the connection surface between the fitting hole 314 and the first valve chamber 315). Thereby, the case 318 is positioned in the fitting hole 314 of the valve body 311 and fixed to the valve body 311. And the solenoid unit 340 is fitted by the edge part by the side of the other end surface 311b in the said fitting site | part of the fitting hole 314. As shown in FIG. With the case 318 positioned in the fitting hole 314, the end face of the solenoid unit 340 is located in front of the end wall 318b of the case 318, and between the end face of the solenoid unit 340 and the end wall 318b of the case 318. The communication space 319 is formed in the
Further, a second valve hole 320 is opened at the center of the end wall 318 b of the case 318, and a discharge hole 318 c is opened at the peripheral wall 318 a of the case 318. Specifically, the second valve hole 320 is disposed on the center line X of the valve body 311. That is, the second valve hole 320, the fitting hole 314, the first valve chamber 315, the first valve hole 316, and the insertion hole 317 have the same center line.
The first valve chamber 315 is formed as a cylindrical hole smaller in diameter than the fitting hole 314 (specifically, the fitting portion). The forming wall of the first valve chamber 315 of the valve body 311 cooperates with the case 318 to form a valve accommodating chamber 321 for accommodating a main valve body 351 and an auxiliary valve body unit 360 of the main valve body unit 350 described later. . In other words, in the present embodiment, the valve storage chamber 321 is configured by the internal space of the case 318 and the first valve chamber 315.
The first valve hole 316 is formed (opened) on the bottom surface of the first valve chamber 315. The insertion hole 317 linearly extends from the first valve hole 316 and opens in the pressure sensing chamber 313. That is, the first valve hole 316 and the insertion hole 317 have the same diameter.
In the present embodiment, the portion on the pressure sensing chamber 313 side of the insertion hole 317 constitutes a support hole 317a for slidably supporting the main valve unit 350, and the first valve hole is larger than the support hole 317a in the insertion hole 317. The portion on the side 316 constitutes a communication space 317 b for communicating the first valve hole 316 with the support hole 317 a. That is, one end of the support hole 317a is in communication with the first valve hole 316 via the communication space 317b, and the other end of the support hole 317a is open to the pressure sensing chamber 313.
Further, in the valve body 311, a back pressure relief throttle passage 325 having a first port 322, a second port 323, a third port 324, and a throttle portion is formed.
One end of the first port 322 opens at a portion between the O-ring 300a and the O-ring 300b on the outer peripheral surface of the valve body 311 (that is, a portion corresponding to the second outer space 104b2). Connected to the area. The other end of the first port 322 is open to the inner peripheral surface of the communication space 317b. Here, one end of the first valve hole 316 is connected to the pressure area of the discharge chamber 142 via the communication space 317 b and the first port 322, and the other end of the first valve hole 316 is open to the valve accommodating chamber 321. doing. Specifically, the other end of the first valve hole 316 is opened to one end wall of the valve storage chamber 321 (the bottom surface of the first valve chamber 315).
One end of the second port 323 opens at a portion between the O ring 300 c and the O ring 300 d on the outer peripheral surface of the valve body 311 (that is, a portion corresponding to the fourth outer space 104 b 4). Connected to the area. The other end of the second port 323 is open to the inner peripheral surface of the communication space 319 at the fitting portion of the fitting hole 314. Here, one end of the second valve hole 320 is connected to the pressure region of the crank chamber 140 via the communication space 319 and the second port 323, and the other end of the second valve hole 320 is open to the valve storage chamber 321. doing. Specifically, the other end of the second valve hole 320 is opened to the other end wall of the valve accommodating chamber 321 (the inner end surface of the end wall 318 b of the case 318).
One end of the third port 324 is opened at a portion between the O ring 300 b and the O ring 300 c on the outer peripheral surface of the valve body 311 (that is, a portion corresponding to the third outer space 104 b 3). Connected to the area. The other end of the third port 324 is open at the inner peripheral surface of the enlarged diameter portion of the fitting hole 314. The first port 322, the second port 323, and the third port 324 are respectively formed at a plurality of locations separated in the circumferential direction of the valve body 311, and extend in the radial direction of the valve body 311.
In this embodiment, the third port 324, a space 314a between the inner peripheral surface of the widening portion of the fitting hole 314 and the outer peripheral surface of the peripheral wall 318a of the case 318, and the discharge hole 318c of the peripheral wall 318a of the case 318. The passage formed constitutes an exhaust internal passage 326 inside the control valve 300 which constitutes a part of the first discharge passage 146a. One end of the discharge internal passage 326 is connected to the pressure region of the suction chamber 141, and the other end of the discharge internal passage 326 is open to the valve storage chamber 321. Specifically, one end of the discharge internal passage 326 (that is, the one end of the third port 324) is opened in a portion corresponding to the third outer space 104b3 in the outer peripheral surface of the valve body 311 to Connected Further, the other end of the discharge internal passage 326 (that is, one end of the discharge hole 318c on the valve storage chamber 321 side) is opened to the inner peripheral surface of the valve storage chamber 321 (inner peripheral surface of the peripheral wall 318a of the case 318) There is. The discharge holes 318c are formed, for example, at a plurality of locations separated in the circumferential direction of the circumferential wall 318a, and extend in the radial direction of the circumferential wall 318a.
One end of the back pressure relief throttle passage 325 is open at a portion between the third port 324 and the O-ring 300 b in the outer peripheral surface of the valve body 311 (a portion corresponding to the third outer space 104 b 3). Connected to the pressure area of the The other end of the back pressure relief throttle passage 325 is a first valve seat 327 formed around the first valve hole 316 in the bottom surface of the first valve chamber 315 and the sub valve body unit 360 (details will be described later) The first region S1 is opened as a back pressure region between the first sub valve portion 362a).
[Pressure-sensitive device]
The pressure sensitive device 330 is disposed in the pressure sensitive chamber 313. The pressure-sensitive device 330 includes a bellows 330a having a bottom, a closing member 330b closing an open end of the bellows 330a, and a first biasing device disposed inside the bellows 330a and urging the bellows 330a in a direction to extend the bellows 330a. A member (compression coil spring) 330c, and a second biasing member (compression coil spring) 330d which is disposed between the closing member 330b and the valve body 311 and biases the bellows in a contracting direction.
The inside of the bellows 330a is in a vacuum state, and the bellows 330a expands and contracts in response to the external pressure. In the present embodiment, the external pressure is the pressure of the suction chamber 141, and the bellows 330a expands and contracts in response to the pressure of the pressure sensing chamber 313 (that is, the pressure Ps of the suction chamber 141). Specifically, the bellows 330 a extends as the pressure sensing chamber 313 (the pressure Ps of the suction chamber 141) decreases.
[Solenoid unit]
The solenoid unit 340 includes a solenoid housing 341, a fixed core 342 incorporated in the solenoid housing 341, a movable core 343, a biasing member 344, a housing member 345 and a coil assembly 346.
The solenoid housing 341 holds or accommodates the fixed core 342, the movable core 343, the biasing member 344, the housing member 345 and the coil assembly 346. The solenoid housing 341 includes a cylindrical peripheral wall portion 341a and an end wall portion 341b fixed to one end (an end portion on the valve housing 310 side) of the peripheral wall portion 341a.
The fixed core 342 has a small diameter portion 342a on one end surface side and a large diameter portion 342b on the other end surface side larger in diameter than the small diameter portion 342a. An insertion hole 342c is formed through the fixed core 342 in the axial direction. Then, a predetermined range on the other end surface 311 b side of the valve body 311 is fitted into a fitting hole 341 d formed in the end wall portion 341 b of the solenoid housing 341, and the large diameter portion 342 b of the fixed iron core 342 is of the valve body 311. The valve housing 310 and the solenoid unit 340 are integrated with each other by being fitted into a fitting hole 314 formed in the other end surface 311 b. Then, the control valve housing (310, 341) including the valve housing 310 (valve body 311, cap member 312) and the solenoid housing 341 is configured.
The movable core 343 is disposed with a predetermined gap between the movable core 343 and the one end surface of the fixed core 342. The solenoid housing 341, the fixed core 342 and the movable core 343 are made of a magnetic material.
The biasing member 344 is disposed between the fixed core 342 and the movable core 343 and biases the movable core 343 away from the one end surface of the fixed core 342. In the present embodiment, a compression coil spring is used as the biasing member 344.
The housing member 345 is formed of a nonmagnetic material in a bottomed cylindrical shape. The housing member 345 accommodates the small diameter portion 342 a of the fixed core 342, the movable core 343 and the biasing member 344 so that the movable core 343 can move in the distraction direction with respect to the one end surface of the fixed core 342.
The coil assembly 346 includes a solenoid coil (hereinafter simply referred to as "coil") 346a and a closing member 346b. The coil 346 a is covered with resin and disposed around the housing member 345. In the present embodiment, the coil 346 a is housed in a housing space formed inside the peripheral wall portion 341 a of the solenoid housing 341. The closing member 346b is a member for closing the other end of the peripheral wall portion 341a of the solenoid housing 341, and is formed of, for example, magnetic free-cutting steel. The closing member 346b is disposed around the movable core 343 in the radial direction, and is integrated with the coil 346a by a resin. Reference numeral 346c in FIG. 2 denotes a resin portion of the coil assembly 346.
When the coil 346a is energized, the solenoid housing 341, the fixed core 342, the movable core 343, and the closing member 346b of the coil assembly 346 form a magnetic circuit and move against the biasing force of the biasing member 344 An electromagnetic force (magnetic attraction force) is generated to move the iron core 343 toward the one end surface of the fixed iron core 342.
[Main valve unit]
Main valve body unit 350 includes main valve body 351, first rod 352 and second rod 353, and extends from one end to the other end of sub valve body unit 360 housed in valve housing chamber 321. It is extended to penetrate. In the present embodiment, the main valve body 351, the first rod 352 and the second rod 353 are integrally formed to constitute a cylindrical (rod-like) main valve body unit 350.
The main valve body 351 is accommodated in the first valve chamber 315 of the valve accommodation chamber 321 to open and close the first valve hole 316. Specifically, the peripheral portion of the end portion of the main valve body 351 on the side of the first valve hole 316 separates and contacts the first valve seat 327 around the first valve hole 316 of the bottom surface of the first valve chamber 315 Thus, the first valve hole 316 is opened and closed.
The first rod 352 is inserted into an insertion hole 317 formed in the valve body 311. One end of the first rod 352 is connected to the central portion of the end of the main valve body 351 on the first valve hole 316 side, and the other end of the first rod 352 is separable to the closing member 330 b of the pressure sensing device 330 Is linked to
Specifically, as shown in FIG. 3, the first rod 352 has a large diameter portion 352 a and a small diameter portion 352 b smaller in diameter than the large diameter portion 352 a. The large diameter portion 352 a is slidably supported by the support hole 317 a of the insertion hole 317, and the small diameter portion 352 b is inserted into the first valve hole 316 and the communication space 317 b of the insertion hole 317.
The second rod 353 is inserted into an insertion hole 342 c formed in the fixed core 342. One end of the second rod 353 is connected to the end of the main valve body 351 opposite to the first valve hole 316 side, and the other end of the second rod 353 is connected to the movable core 343.
In the present embodiment, as shown in FIG. 3, the second rod 353 has a large diameter portion 353 a and a small diameter portion 353 b smaller in diameter than the large diameter portion 353 a. The large diameter portion 353 a is inserted into the insertion hole 342 c, and the small diameter portion 353 b is disposed in the valve storage chamber 321. A predetermined range on the small diameter portion 353 b side of the large diameter portion 353 a is disposed in a second valve hole 320 formed in the end wall 318 b of the case 318 fitted in the fitting hole 341.
Further, in the present embodiment, as shown in FIG. 3, the second rod 353 further includes a first guiding portion 353 c and a second guiding portion 353 d. The first guide portion 353c constitutes an end of the second rod 353 on the main valve body 351 side, and has a conical outer peripheral surface that gradually expands in diameter toward the main valve body 351 side. The second guide portion 353d is provided between the small diameter portion 353b and the large diameter portion 353a, and has a conical outer peripheral surface which gradually expands in diameter toward the large diameter portion 353a (that is, the second valve hole 320). Have.
Here, as described above, in the pressure sensitive device 330, the bellows 330a expands and contracts in response to the pressure Ps of the suction chamber 141. Then, when the bellows 330a is extended to a predetermined length or more as the pressure Ps of the suction chamber 141 decreases, the closing member 330b is connected to the other end of the first rod 352 of the main valve unit 350, and the main valve The unit 350 is biased in the direction in which the main valve body 351 opens the first valve hole 316. That is, in response to the pressure Ps of the suction chamber 141 which is the external pressure, the pressure-sensitive device 330 exerts an urging force in the valve opening direction of the first valve hole 316 on the main valve body unit 350.
In the solenoid unit 340, when the coil 346a is energized, an electromagnetic force is generated to move the movable core 343 toward the one end surface of the fixed core 342. Then, when the movable iron core 343 is moved by the generated electromagnetic force, the main valve body unit 350 is biased in the direction in which the main valve body 351 closes the first valve hole 316. That is, the solenoid unit 340 is energized in the valve closing direction of the first valve hole 316 in the main valve unit 350 by the coil 346a being energized and the movable core 343 moving toward the one end face of the fixed core 342. To work.
[Adjustment operation of opening degree of supply passage]
Next, the adjustment operation of the opening degree of the supply passage 145 in the control valve 300 will be briefly described.
At the time of operation of the air-conditioner system, that is, in the operation state of the variable displacement compressor 100, the amount of energization of the coil 346a of the solenoid unit 340 is set by a controller (not shown) Be done. The coil 346a is driven by pulse width modulation (PWM control) at a predetermined frequency in the range of 400 Hz to 500 Hz, for example, to set the amount of energization. Then, the control valve 300 causes the first valve hole 316 (i.e., the supply passage) by (the main valve body 351 of) the main valve body unit 350 such that the pressure Ps of the suction chamber 141 becomes a predetermined value corresponding to the amount of current supplied. The discharge amount of the variable displacement compressor 100 is controlled by adjusting the opening degree of 145). Specifically, the control valve 300 operates to autonomously adjust the opening degree of the first valve hole 316 (that is, the supply passage 145) in response to the pressure Ps of the suction chamber 141.
Further, when the operation of the air conditioning system is stopped, that is, when the variable displacement compressor 100 is switched from the operating state to the non-operating state, the control device turns OFF the coil 346a of the solenoid unit 340. Then, in the solenoid unit 340, the movable core 343 moves in a direction away from the one end surface of the fixed core 342 by the biasing force of the biasing member 344 and the main valve body unit 350 (the The valve body 351 moves in the direction to open the first valve hole 316, and the first valve hole 316 (ie, the supply passage 145) is maximally opened. As a result, the refrigerant is supplied to the crank chamber 140, the pressure in the crank chamber 140 is increased, and the displacement of the variable displacement compressor 100 is minimized.
[Supply of secondary valve unit]
FIG. 4 is an enlarged sectional view of an assembly of the sub valve body unit 360 and the case 318. As shown in FIG. The secondary valve body unit 360 is assembled integrally with the case 318 as shown in FIG. The assembly is fixed to the valve body 311 by the case 318 being fitted and positioned in the fitting hole 314 as described above, as shown in FIGS. 2 and 3. As a result, the sub valve body unit 360 is accommodated in the valve accommodating chamber 321 composed of the internal space of the case 318 and the first valve chamber 315.
The sub valve body unit 360 is provided in the partition member 361 fixed in the valve storage chamber 321 and in the central axis of the valve storage chamber 321 (= the extending direction of the center line X of the valve body 311) of the valve storage chamber 321. It includes a sub valve body 362 moving along and a communication passage 363.
The partitioning member 361 has a first valve chamber 315 in which the first valve hole 316 opens, a second valve chamber 320 in which the first valve hole 316 opens, and a second valve chamber 328 in which the discharge internal passage 326 (specifically, the discharge hole 318c) opens. It is a member that divides into In the present embodiment, the valve storage chamber 321 is composed of the internal space of the case 318 and the first valve chamber 315 as described above. Therefore, the second valve chamber 328 is constituted by the internal space of the case 318.
In the present embodiment, as shown in FIG. 4, a fitting hole 318d for the dividing member 361 and a small diameter hole 318e having a smaller diameter than the fitting hole 318d are formed at the open end of the peripheral wall 318a of the case 318. There is. And while the division member 361 is formed in a substantially disk shape, the penetration hole 361a is penetratingly formed by the center part. The sub valve body 362 is inserted into the insertion hole 361 a. An annular projection 361 b surrounding the insertion hole 361 a and projecting toward the first valve chamber 315 is formed on the surface of the partitioning member 361 on the first valve chamber 315 side. For example, the partitioning member 361 is fitted in the fitting hole 318d, and the peripheral edge thereof abuts on the connection surface between the fitting hole 318d and the small diameter hole 318e, and is positioned and fixed to the case 318.
Specifically, as shown in FIG. 4, the sub valve body 362 integrally includes a first sub valve portion 362 a, a second sub valve portion 362 b, and a shaft portion 362 c. An insertion hole 364 for insertion of the main valve unit 350 is formed in the sub valve body 362. The insertion hole 364 is formed to extend along the center line of the sub valve body 362 from one end of the sub valve body 362 to the other end. The details of the insertion hole 364 will be described in detail later.
The first sub valve portion 362 a is disposed to surround the outer periphery of the main valve body 351 of the main valve body unit 350 and to face the first valve seat 327. The first sub-valve portion 362 a has an outer peripheral surface that slidably contacts the inner peripheral surface of the valve storage chamber 321. The first sub-valve portion 362 a is a member disposed in the first valve chamber 315 of the valve storage chamber 321 and in contact with the first valve seat 327 formed around the first valve hole 316.
The second sub valve portion 362 b is disposed in the second valve chamber 328 of the valve storage chamber 321 and is formed around the second valve hole 320 (specifically, the surface of the end wall 318 b on the second valve chamber 328 side) And a second valve seat 318f (see FIGS. 3 and 4).
The shaft portion 362c connects the first sub valve portion 362a and the second sub valve portion 362b and penetrates the dividing member 361 and has an axis smaller than the outer diameters of the first sub valve portion 362a and the second sub valve portion 362b. It is a member having an outer diameter.
The communication passage 363 is a passage for connecting the first valve hole 316 and the second valve hole 320, and includes a first communication passage 363a and a second communication passage 363b. The first communication passage 363 a is a passage formed of a cylindrical region between the inner peripheral surface of the insertion hole 364 of the sub valve body 362 and the outer peripheral surface of the main valve unit 350. The second communication passage 363b is a passage extending through the outer peripheral surface side of the first sub valve portion 362a and communicating the first region (back pressure region) S1 with the first communication passage 363a. The details of the auxiliary valve body 362, the first communication passage 363a, and the second communication passage 363b will be described later.
[Operation of secondary valve unit]
FIG. 5 is a cross-sectional view of an essential part for explaining the operation state of the sub valve body unit 360, and FIG. 5 (A) shows a refrigerant supply state (first state) from the discharge chamber 142 to the crank chamber 140. 5B shows the state immediately after the first valve hole 316 is closed in the first state (the state immediately after the valve closing), and FIG. 5C shows the state from the crank chamber 140 to the suction chamber 141. Indicates a pressure release state (second state). That is, the sub valve body unit 360 is configured to switch between the first state and the second state.
The end face of the sub valve body 362 on the side of the first valve hole 316 receives the pressure in the region of the supply passage 145 closer to the discharge chamber 142 than the sub valve body 362, ie, the so-called back pressure Pm. On the other hand, the end face on the second valve hole 320 side of the sub valve body 362 receives the pressure Pc of the crank chamber 140. Then, in response to the pressure difference ΔP (ΔP = Pm−Pc) between the back pressure Pm and the pressure Pc, the auxiliary valve body 362 moves in the valve accommodating chamber 321 in the extending direction of the center line X. The pressure receiving area s1 of the sub valve body 362 in the center line X direction receiving the back pressure Pm and the pressure receiving area s2 of the sub valve body 362 receiving the pressure Pc in the crank chamber 140 are set to, for example, s1 = s2. In order to adjust the operation of the valve body 362, s1> s2 or s1 <s2 can be set. In the present embodiment, as described above, the valve body 311 is formed with the back pressure relief throttle passage 325 that communicates the first region S1 with the suction chamber 141. When the main valve unit 350 closes the first valve hole 316 and the supply passage 145 is closed, the back pressure relief throttle passage 325 releases the refrigerant in the first region S1 to the suction chamber 141 side. Provided for Since the back pressure relief throttle passage 325 has a throttle portion, the amount of refrigerant flowing out of the first region S1 into the suction chamber 141 via the back pressure relief throttle passage 325 is small.
First, the switching operation from the second state to the first state will be described.
The main valve body 351 of the main valve body unit 350 is separated from the first valve seat 327 in a state where the first sub valve portion 362a is in contact with the first valve seat 327 (the second state in FIG. 5C). Then, when the first valve hole 316 is opened, the back pressure Pm acting on the first sub valve portion 362a becomes high. After that, when the back pressure Pm becomes higher than the pressure Pc of the crank chamber 140 (in the state of Pm-Pc> 0), the first sub valve portion 362a starts to separate from the first valve seat 327. Then, as shown in FIG. 5A, when the second sub valve portion 362b abuts on the second valve seat 318f, the first sub valve portion 362a is most separated from the first valve seat 327 (see FIG. State 1). Thereby, the sub valve body unit 360 switches from the second state to the first state. In the first state, the communication between the second valve hole 320 and the discharge internal passage 326 is cut off, and the first discharge passage 146a of the discharge passages 146 connecting the crank chamber 140 and the suction chamber 141 is closed. At the same time, the first valve hole 316 and the second valve hole 320 communicate with each other through the communication passage 363, and the supply passage 145 communicating the discharge chamber 142 with the crank chamber 140 is opened.
That is, when the main valve body unit 350 opens the first valve hole 316, the first discharge passage 146a passing through the inside of the control valve 300 in the discharge passage 146 is closed simultaneously with the first valve hole 316 and The refrigerant in the discharge chamber 142 is supplied to the crank chamber 140 through the communication passage 363 including the first communication passage 363a and the second communication passage 363b.
As a result, only the second discharge passage 146 b provided to bypass the control valve 300 in the discharge passage 146 and always communicating between the crank chamber 140 and the suction chamber 141 is opened. The minimum opening area is the opening area of the fixed stop 103c. Therefore, the discharge of the refrigerant from the crank chamber 140 to the suction chamber 141 is suppressed. Then, in this state, the refrigerant flowing from the first valve hole 316 is promptly supplied to the crank chamber 140 via the communication passage 363 formed of the first communication passage 363a and the second communication passage 363b, whereby the crank chamber 140 is produced. Pressure is likely to rise. As a result, the pressure in the crank chamber 140 rapidly rises according to the opening degree of the supply passage 145, the inclination angle of the swash plate 111 decreases from the maximum, and the piston stroke (discharge volume) can be rapidly controlled. .
Further, in the present embodiment, the supply passage 145 includes the communication passage 104 d (see FIG. 1), the second outer space 104 b 2 (see FIGS. 1 and 2), the first port 322, the communication space 317 b, and the first valve hole 316. , First region S1, communication passage 363 (first communication passage 363a, second communication passage 363b), second valve hole 320, communication space portion 319, second port 323, fourth outer space 104b4 (FIGS. 1 and 2) (See reference), the communication passage 104f, the through hole of the valve plate 103, and the communication passage 101c. Therefore, in the present embodiment, the fluid passage in the control valve 300 that constitutes a part of the supply passage 145 is the first port 322, the communication space 317b, the first valve hole 316, the first region S1, and the communication passage. 363 (a first communication passage 363a, a second communication passage 363b), a second valve hole 320, a communication space 319, and a second port 323.
Next, the switching operation from the first state to the second state will be described.
In the state where the second sub valve portion 362b is in contact with the second valve seat 318f (the first state in FIG. 5A), the main valve body unit 350 starts to move in the valve closing direction. When the main valve body 351 abuts on the first valve seat 327 as shown in FIG. 5B and the first valve hole 316 is closed, the refrigerant in the first valve chamber 315 is used for back pressure relief. The back pressure Pm discharged to the suction chamber 141 via the throttle passage 325 and acting on the first sub valve portion 362 a gradually decreases. Thereafter, when the back pressure Pm becomes lower than the pressure Pc of the crank chamber 140 (in the state of Pm-Pc <0), the refrigerant passes through the second valve hole 320 and the first communication passage 363a to the first valve chamber 315 side. Backflow toward the The sub valve body 362 is pressed by the backflowing refrigerant flow to move to the first valve seat 327 side, and the second sub valve portion 362 b starts to separate from the second valve seat 318 f. Then, when the first sub valve portion 362a contacts the first valve seat 327 as shown in FIG. 5C, the second sub valve portion 362b is most separated from the second valve seat 318f. (First state → second state). Thereby, the sub valve body unit 360 switches from the first state to the second state. In this second state, the second valve hole 320 and the discharge internal passage 326 are communicated via the second valve chamber 328, and the opening degree of the first discharge passage 146a becomes the maximum opening degree, and at the same time, the first valve The communication between the hole 316 and the second valve hole 320 via the communication passage 363 is interrupted, and the supply passage 145 is closed.
That is, when the main valve body unit 350 closes the first valve hole 316, the supply passage 145 is closed, and at the same time, the second valve hole 320 and the discharge internal passage 326 communicate with each other, and the first discharge passage 146a, The refrigerant in the crank chamber 140 is discharged to the suction chamber 141 via the second discharge passage 146 b.
As a result, the supply of the refrigerant from the discharge chamber 142 to the crank chamber 140 is stopped, and the discharge passage 146 is fully opened. Therefore, the refrigerant in the crank chamber 140 is quickly discharged to the suction chamber 141 via the second discharge passage 146 b (fixed throttle 103 c) and the first discharge passage 146 a. As a result, the pressure in the crank chamber 140 promptly becomes equal to the pressure in the suction chamber 141, the inclination angle of the swash plate is maximized, and the piston stroke (discharge displacement) is rapidly maximized.
Further, in the present embodiment, the first discharge passage 146a is formed by the communication passage 101c, the through hole of the valve plate 103, the communication passage 104f, the fourth outer space 104b4, the second port 323, the communication space 319, and the second valve hole. 320, the second valve chamber 328, the discharge internal passage 326 (specifically, the discharge hole 318c, the space 314a, the third port 324), the third outer space 104b3, and the communication passage 104e. Therefore, in the present embodiment, a part of the fluid passage in the control valve 300 which constitutes a part of the first discharge passage 146 a is the second valve hole 320, the communication space 319, and the second port 323. In the present embodiment, the combined passage serving as the first discharge passage 146a and the supply passage 145 is the communication passage 101c, the through hole of the valve plate 103, the communication passage 104f, the fourth outer space 104b4, and the control valve. It is a part of the fluid passage inside of 300 (that is, the second port 323, the communication space 319, and the second valve hole 320).
Thus, in the sub valve body 362, the main valve body 351 of the main valve body unit 350 is separated from the first valve seat 327 and the first region S1 between the first valve seat 327 and the first sub valve portion 362a. When the pressure (i.e., the back pressure Pm) increases, the first valve hole 316 and the second valve hole 320 are communicated with each other via the communication passage 363 and the second valve hole 320 is communicated with the discharge internal passage 326. Move to shut off. On the other hand, when the main valve body 351 abuts on the first valve seat 327 and the pressure (back pressure Pm) in the first region S1 decreases in the sub valve body 362, the first valve hole 316 and the second valve hole 320. And the second valve hole 320 and the discharge internal passage 326 to communicate with each other.
In other words, the sub valve body unit 360 is provided in the valve storage chamber 321 and operates in accordance with the front / rear differential pressure (the pressure difference) ΔP to connect the first valve hole 316 and the second valve hole 320 The opening degree of the discharge passage 146 is controlled by switching to the second state in which the second valve hole 320 and the discharge internal passage 326 communicate with each other.
[Detailed structure of sub valve body unit]
Next, the structures of the first sub valve portion 362a, the second sub valve portion 362b, and the shaft portion 362c of the sub valve body 362 will be described in detail with reference to FIG. 3, FIG. 4 and FIG. FIG. 6 is an enlarged view of the main part in FIG.
The first sub-valve portion 362a includes a sliding portion 362a1, a front end 362a2, and a rear end 362a3.
The sliding portion 362a1 has an outer peripheral surface that is in sliding contact with the inner peripheral surface of the valve storage chamber 321 (more specifically, the first valve chamber 315), and the first valve chamber 315 and the first region S1 on the first valve hole 316 side. It divides into the 2nd field S2 by the side of division member 361. The sliding portion 362a1 is formed in a substantially cylindrical shape and has an outer diameter larger than the outer diameter of the rear end portion 362a3. The outer peripheral surface of the sliding portion 362 a 1 is slidably supported by the inner peripheral surface of the first valve chamber 315.
A first small diameter hole portion 364a is formed through the radial center portion of the sliding portion 362a1. One end of the first small diameter hole 364a is opposed to the first valve hole 316 and connected to the first region S1, and the other end of the first small diameter hole 364a is a first large diameter hole 364b of the rear end 362a3 described later. Connect to
Further, in the sliding portion 362a1, a communication passage 363b1 that constitutes a part of the second communication passage 363b is formed. The communication passage 363b1 is a passage for causing the first region S1 and the second region S2 to communicate with each other. The communication passage 363b1 is, for example, a groove (slit) formed on the outer peripheral surface of the sliding portion 362a1. The communication passage 363b1 may be one, but in the present embodiment, the communication passage 363b1 is a groove extending in the axial direction of the sliding portion 362a1 at a plurality of angular positions separated in the circumferential direction of the sliding portion 362a1. In addition, in the cross-sectional angular position shown to a figure, although the communication path 363b1 is one, it is formed in multiple numbers in fact.
The front end portion 362a2 is formed at an end portion of the sliding portion 362a1 on the first region S1 side, and is in contact with the first valve seat 327. The front end portion 362a2 protrudes, for example, in an annular shape from an end of the sliding portion 362a1 on the first region S1 side.
At the front end portion 362a2, a second communication passage throttle passage 363b2 which constitutes a part of the second communication passage 363b is formed. The passage cross sectional area of the second communication passage throttle passage 363b2 is set to be the minimum passage cross sectional area of the second communication passage 363b, and the second communication passage throttle passage 363b2 is the throttle portion of the second communication passage 363b. Configure The second communication passage throttle passage 363b2 penetrates the front end portion 362a2 at a predetermined angular position in the circumferential direction of the annular front end portion 362a2, and communicates the radially inner region and the radially outer region of the front end portion 362a2 .
The rear end portion 362a3 extends from the end on the second region S2 side of the sliding portion 362a1 toward the partitioning member 361 and has a flush outer peripheral surface and is formed in a tubular shape. The outer diameter of the rear end portion 362a3 is smaller than the outer diameter of the sliding portion 362a1, and is formed to be approximately the same as the outer diameter of the annular projecting portion 361b of the partitioning member 361. The end of the shaft 362c is fitted to the open end of the cylindrical rear end 362a3. In a state where the shaft portion 362c is fitted to the rear end portion 362a3, the rear end portion 362a3 has a columnar first large diameter hole portion 364b having an inner diameter equal to the outer diameter of the shaft portion 362c. The first large diameter hole 364b has an inner diameter larger than that of the first small diameter hole 364a, and is connected to the other end of the first small diameter hole 364a.
In addition, a rear end through hole 363b3 which constitutes a part of the second communication passage 363b is formed through the peripheral wall of the rear end 362a3. The rear end through hole 363b3 penetrates the peripheral wall of the rear end 362a3 at a predetermined angular position in the circumferential direction of the rear end 362a3, and the area in the second area S2 and the rear end 362a3 (that is, the first large diameter hole It communicates with the portion 364b).
The second sub valve portion 362 b is, for example, integrally formed with the shaft portion 362 c. In the integrally formed body of the second sub-valve portion 362b and the shaft portion 362c, a cylindrical second small diameter hole portion 364c and a cylindrical second large diameter hole portion 364d having a diameter larger than that of the second small diameter hole portion 364c. And are formed. One end of the second small diameter hole portion 364c is opened at one end surface of the integrally formed body and connected to the first large diameter hole portion 364b, and the other end of the second small diameter hole portion 364c is a second large diameter hole portion 364d. Connected Further, one end of the second large diameter hole portion 364d is connected to the second small diameter hole portion 364c, and the other end of the second large diameter hole portion 364d is opened to the other end face of the integrally formed body so that the second valve hole 320 is formed. It is opposite to. The inner diameter of the second small diameter hole 364 c is set larger than the outer diameter of the main valve body 351. The inner diameter of the second large diameter hole 364 d is set to, for example, the same diameter as the inner diameter of the second valve hole 320.
[Insertion hole for main valve body unit insertion]
Next, the insertion holes 364 for insertion of the main valve body unit 350 will be described in detail with reference to FIGS. 3, 4 and 6.
In the present embodiment, the main valve body 351 of the main valve body unit 350 is inserted through the first small diameter hole portion 364a of the sliding portion 362a1. In addition, a first guiding portion 353c of the second rod 353 of the main valve body unit 350 is disposed in the first large diameter hole 364b of the rear end portion 362a3. The small diameter portion 353b of the second rod 353 of the main valve unit 350 is disposed in the second small diameter hole portion 364c of the integrally formed body of the second sub valve portion 362b and the shaft portion 362c, and the second large diameter portion The second guiding portion 353d of the second rod 353 is disposed in the hole 364d. The first small diameter hole 364a, the first large diameter hole 364b, the second small diameter hole 364c, and the second large diameter hole 364d extend from the one end of the sub valve body 362 along the center line X of the valve body 311. It is formed to penetrate through the other end. Therefore, in the present embodiment, the insertion holes 364 for insertion of the main valve body unit 350 are the first small diameter hole 364a, the first large diameter hole 364b, the second small diameter hole 364c, and the second large diameter hole 364d. It is composed of
In other words, in the present embodiment, the insertion hole 364 in the first sub valve portion 362 a, which is the first valve seat side end portion of the sub valve body 362, includes the first small diameter hole portion 364 a and the first small diameter hole portion 364 a through which the main valve body 351 is inserted. The small diameter hole portion 364a is formed into a stepped cylindrical shape including a first large diameter hole portion 364b having a larger diameter. In addition, the insertion hole 364 at the second valve seat side end of the sub valve body 362 faces the second small diameter hole 364c and the second valve seat 318f communicating with the first large diameter hole 364b and the second small diameter hole It is formed in the shape of a stepped cylinder including a second large diameter hole 364 d having a diameter larger than that of the portion 364 c. The insertion hole 364 is formed to insert the main valve unit 350 in a noncontact manner. Thereby, even if the main valve body unit 350 is slightly vibrated by PWM control, direct transmission of the fine vibration to the sub valve body unit 360 can be avoided.
[First communication passage and second communication passage]
In the present embodiment, the first communication passage 363a, which is a cylindrical passage between the inner peripheral surface of the insertion hole 364 of the sub valve body 362 and the outer peripheral surface of the main valve unit 350, has a first small diameter hole portion. The inner circumferential surface of 364a, the inner circumferential surface of the first large diameter hole 364b, the inner circumferential surface of the second small diameter hole 364c, the inner circumferential surface of the second large diameter hole 364d, and the outer circumferential surface of the main valve unit 350 And a cylindrical passage in the region between them.
Here, in the present embodiment, as shown in FIG. 6, the first valve seat 327 includes a recess 327a, a main valve body valve seat surface 327b, and a sub valve body valve seat surface 327c. The recess 327a is formed in a concave shape, and the other end of the first valve hole 316 is opened at the bottom of the recess. The main valve body valve seat surface 327b is formed around the first valve hole 316 at the bottom of the recess of the recess 327a, and an annular portion with which the peripheral portion of the end of the main valve body 351 on the first valve hole 316 side abuts. It is the seat of The auxiliary valve body valve seat surface 327c is formed around the recess 327a, and the peripheral portion of the end portion of the auxiliary valve body 362 on the first valve hole 316 side (that is, the front end 362a2 of the first auxiliary valve portion 362a) is It is an annular seat that contacts. Therefore, the first state where the front end portion 362a2 of the first sub valve portion 362a is separated from the sub valve body valve seat surface 327c and the state immediately after the valve closing (FIGS. 5A and 5B) In the above, the region of the first valve chamber 315 from the first valve seat 327 to the sliding portion 362a1 corresponds to the first region S1 as a back pressure region. On the other hand, in the second state (FIG. 5C) in which the front end portion 362a2 of the first sub valve portion 362a is in contact with the sub valve body valve seat surface 327c, the recess 327a in the first valve seat 327 A region defined by the front end portion 362a2 and an end face of the sliding portion 362a1 on the first valve seat 327 side corresponds to a first region S1 as a back pressure region.
In the first state and the state immediately after the valve closing (FIGS. 5A and 5B), the first region S1 is the inside of the first small diameter hole portion 364a of the first communication passage 363a. The first large diameter hole 364b is in communication with the first large diameter hole 364b through an annular passage formed of a gap between the circumferential surface and the outer peripheral surface of the main valve body 351, and the communication passage 363b1 of the sliding portion 362a1 and the rear end portion The first large diameter hole 364b (first communication passage 363a) is formed via a passage passing through the rear end through hole 363b3 of 362a3 (that is, a passage extending via the outer peripheral surface side of the first sub valve portion 362a). It communicates. In the second state (FIG. 5C), the first region S1 is between the inner circumferential surface of the first small diameter hole 364a of the first communication passage 363a and the outer circumferential surface of the main valve body 351. The second communication passage throttle passage 363b2 of the front end portion 362a2, the communication passage 363b1 of the sliding portion 362a1, and the rear end portion 362a3 communicate with the first large diameter hole portion 364b through an annular passage formed of a gap. It communicates with the first large diameter hole 364b (first communication passage 363a) through the passage passing through the rear end through hole 363b3 (that is, the passage extending through the outer peripheral surface side of the first sub valve portion 362a) Do.
As described above, in the present embodiment, the second communication passage 363 b extending through the outer peripheral surface side of the first sub valve portion 362 a communicates the first region S 1 as the back pressure region and the first communication passage 363 a The second communication passage throttle passage 363b2 of the front end portion 362a2, the communication passage 363b1 of the sliding portion 362a1, and a passage passing through the rear end through hole 363b3 of the rear end portion 362a3.
In the present embodiment, an end of the first communication passage 363a on the first valve hole 316 side (that is, a portion corresponding to the first small diameter hole 364a) is a first communication passage throttle passage 365 surrounding the main valve body 351. (Refer to FIG. 6). Then, in a state where the sub valve body 362 is in contact with the first valve seat 327, the second communication passage 363b has a predetermined minimum passage cross sectional area. In the present embodiment, the minimum passage cross-sectional area of the second communication passage 363b in this contact state is defined by the passage cross-sectional area of the second communication passage throttle passage 363b2. The minimum passage cross-sectional area of the second communication passage 363b in this contact state is set, for example, to be larger than the passage cross-sectional area of the first communication passage throttle passage 365.
Further, in the present embodiment, in the state where the sub valve body 362 is separated from the first valve seat 327, the minimum passage sectional area of the second communication passage 363b (in other words, the minimum passage of the second communication passage 363b in the separated state) The cross-sectional area is set larger than the minimum passage cross-sectional area of the first communication passage 363a (in the present embodiment, the passage cross-sectional area of the first communication passage throttle passage 365). The minimum passage cross-sectional area of the second communication passage 363b in this separated state is, for example, substantially defined by the passage cross-sectional area of the communication passage 363b1 of the second communication passage 363b.
[Receiving surface and guide part]
In the present embodiment, the sub valve body 362 is a receiving surface 366 with which the refrigerant flowing into the first communication path 363 a via the second valve hole 320 collides, and the dynamic pressure in the direction approaching the first valve seat 327 Receiving surface 366.
Specifically, in the present embodiment, the receiving surface 366 includes a first receiving surface 366a, a second receiving surface 366b, and a third receiving surface 366c.
The first receiving surface 366a is formed by an annular end face connecting the first large diameter hole 364b and the first small diameter hole 364a, and is provided in the first sub valve 362a. The second receiving surface 366b is formed by an annular end face that connects the second large diameter hole 364d and the second small diameter hole 364c, and is provided in the second sub valve 362b. The third receiving surface 366c is configured by an end exposed to the second region S2 in the sliding portion 362a1.
Further, in the present embodiment, as described above, the main valve body unit 350 (specifically, the second rod 353) has the first guiding portion 353c and the second guiding portion 353d. The first guide portion 353c is disposed in the first large diameter hole portion 364b, and has a conical outer peripheral surface that gradually expands in diameter toward the main valve body 351 side. The first guiding portion 353 c guides the refrigerant flowing into the portion corresponding to the first large diameter hole portion 364 b of the first communication passage 363 a via the second valve hole 320 toward the first receiving surface 366 a. The second guide portion 353d is disposed in the second large diameter hole portion 364d and provided between the small diameter portion 353b and the large diameter portion 353a, and is a cone which gradually expands in diameter toward the second valve hole 320 side. It has an outer peripheral surface of The second guiding portion 353 d guides the refrigerant flowing into the portion of the first communication passage 363 a corresponding to the second large diameter hole portion 364 d via the first valve hole 316 toward the second valve hole 320.
[Refrigerant flow path]
Next, the refrigerant flow path in each operating state of the sub valve body unit 360 will be described in detail with reference to FIG.
Immediately after the first valve hole 316 is opened in the second state shown in FIG. 5C, the first region divided by the recess 327a and the end face of the front end portion 362a2 on the first valve seat 327 side The refrigerant flowing into the S1 from the first valve hole 316 flows into the first large diameter hole 364b via the first communication passage throttle passage 365 of the first communication passage 363a, and the refrigerant in the second communication passage 363b It flows into the radially outer region of the front end portion 362a2 through the second communication passage throttle passage 363b2. Then, due to the throttling effect of the first communication passage throttle passage 365 and the second communication passage throttle passage 363 b 2, the back pressure Pm in the first region S 1 rises quickly, and the sub valve body 362 is removed from the first valve seat 327 Separated and then abut on the second valve seat 318f (first state).
In the first state shown in FIG. 5A, the refrigerant passing through the communication passage 363b1 and the rear end through hole 363b3 is the refrigerant passing through the first communication passage throttle passage 365 in the first large diameter hole portion 364b. Merge with. The refrigerant having flowed into the first large diameter hole 364 b is between the inner circumferential surface of the second small diameter hole 364 c and the inner circumferential surface of the second large diameter hole 364 d and the outer circumferential surface of the main valve body unit 350. The crank chamber 140 is supplied via the cylindrical passage (the first communication passage 363a), the second valve hole 320, the communication space 319, and the second port 323. At this time, the refrigerant flowing into the second large diameter hole 364 d flows along the outer peripheral surface of the second guide portion 353 d and is efficiently guided to the second valve hole 320.
In the state immediately after the closing of the first valve hole 316 shown in FIG. 5B, the refrigerant flows back toward the first valve chamber 315 via the second valve hole 320 and the first communication passage 363a. Specifically, the refrigerant is a cylindrical passage formed of a region between the inner peripheral surface of the second large diameter hole portion 364 d and the inner peripheral surface of the second small diameter hole portion 364 c and the outer peripheral surface of the main valve body unit 350 ( It flows backward through the first communication passage 363a) and is led into the first large diameter hole 364b. At the time of the reverse flow, the refrigerant is guided toward the second receiving surface 366b by the outer peripheral surface of the large diameter portion 353a of the second rod 353 in the second valve hole 320, and collides with the second receiving surface 366b. In the large diameter hole portion 364b, it is guided toward the first receiving surface 366a by the first guide portion 353c and collides with the first receiving surface 366a. Then, most of the refrigerant in the first large diameter hole 364b flows into the second region S2 through the rear end through hole 363b3 and collides with the third receiving surface 366c, and the communication passage 363b1, the first region The air is discharged into the suction chamber 141 via the S 1 and the back pressure relief throttle passage 325. As a result, the sub valve body 362 is pressed by the backflowing refrigerant flow, moves toward the first valve seat 327, contacts the first valve seat 327, and switches to the second state shown in FIG. 5C. .
In the second state shown in FIG. 5C, since the second sub valve portion 362b is separated from the second valve seat 318f, the second valve hole 320 communicates with the second valve chamber 328. Therefore, the refrigerant flowing from the second valve hole 320 is discharged to the suction chamber 141 via the second valve chamber 328 and the discharge internal passage 326 (discharge holes 318c, 314a, third port 324).
According to the variable displacement compressor 100 according to the present embodiment, the control valve 300 controls the degree of opening of the supply passage 145 that supplies the refrigerant in the discharge chamber 142 to the crank chamber 140, and also between the crank chamber 140 and the suction chamber 141. The opening degree of the discharge passage 146 to be connected is controlled. In the control valve 300, the communication passage 363 for connecting the first valve hole 316 and the second valve hole 320 is an insertion hole of the sub valve body 362 of the sub valve unit 360 that controls the opening degree of the discharge passage 146. A first area as a back pressure area that extends via the cylindrical first communication passage 363a between the inner peripheral surface of 364 and the outer peripheral surface of the main valve unit 350 and the outer peripheral surface side of the first sub valve portion 362a A second communication passage 363 b is provided that communicates S 1 with the first communication passage 363 a. That is, the end on the back pressure region side of the communication passage 363 for communicating the first valve hole 316 and the second valve hole 320 is branched into two paths. Therefore, even when the end on the back pressure region side of the first communication passage 363a functions as the first communication passage throttle passage 365 as in the present embodiment, the main valve body unit 350 is opened. Since the refrigerant can be supplied from the discharge chamber 142 to the crank chamber 140 through the second communication passage 363b in addition to the first communication passage throttle passage 365, a sufficient amount of refrigerant is supplied to the crank chamber 140 . As a result, the pressure in the crank chamber 140 is quickly boosted, and the discharge displacement can be smoothly (rapidly) reduced. As a result, the discharge displacement can be stably controlled.
In this manner, it is possible to provide the variable displacement compressor 100 capable of rapidly increasing the pressure in the crank chamber 140 (in other words, preventing a delay in the pressure increase in the crank chamber 140).
In the present embodiment, a back pressure relief throttle passage 325 communicating between the suction chamber 141 and the first region S1 as a back pressure region is formed in the valve body 311. As a result, after the first valve hole 316 is closed by the main valve body 351 (the state of FIG. 5B), the back pressure Pm is rapidly reduced, and the second valve hole 320 and the first communication passage 363a are passed. Thus, it is possible to easily generate a refrigerant flow that flows back toward the first valve chamber 315 side.
In the present embodiment, the end on the first valve hole 316 side of the first communication passage 363 a constitutes a first communication passage throttle passage 365 surrounding the main valve body 351, and the sub valve body 362 serves as the first valve seat 327. In the abutting state, the second communication passage 363 b has a predetermined minimum passage cross-sectional area. Specifically, the first communication passage throttle passage 365 is provided at the end of the first communication passage 363a on the first valve hole 316 side, and the second communication passage 363b at the end on the first valve hole 316 side is the second link. Passage throttle passage 363 b 2 was provided. Thus, immediately after the main valve body 351 opens the first valve hole 316 in the second state shown in FIG. 5C, the first communication passage throttle passage 365 and the second communication passage throttle passage 363 b 2 By the throttling effect, the back pressure Pm in the first region S1 can be quickly increased, and the sub valve body 362 can be smoothly separated from the first valve seat 327.
In the present embodiment, the minimum passage cross-sectional area of the second communication passage 363b in the contact state (the state in which the sub valve body 362 contacts the first valve seat 327, for example, the second state in FIG. 5C). Is set larger than the passage cross-sectional area of the first communication passage throttle passage 365. Thereby, in the contact state, the first communication passage throttle passage 365 becomes the throttle portion of the entire communication passage 363, and the refrigerant flow linearly flowing from the first valve hole 316 toward the sub valve body 362 is the first connection. Passage throttle passage 365 effectively squeezes. As a result, immediately after the main valve body 351 opens the first valve hole 316, the back pressure Pm in the first region S1 can be raised more quickly.
In this embodiment, the minimum passage cross-sectional area of the second communication passage 363b in the separated state (the state in which the sub valve body 362 is separated from the first valve seat 327, for example, the first state in FIG. 5A). Is set larger than the minimum passage cross-sectional area of the first communication passage 363a (in the present embodiment, the passage cross-sectional area of the first communication passage throttle passage 365). Thus, the main passage of the entire communication passage 363 in the separated state (the first state in FIG. 5A) can be secured by the second communication passage 363 b, so the passage of the first communication passage throttle passage 365 The cross sectional area can be set smaller. Therefore, the throttling effect of the first communication passage throttle passage 365 immediately after the main valve body 351 opens the first valve hole 316 in the contact state (the second state of FIG. 5C) is more effective. Can be enhanced. As a result, immediately after the main valve body 351 opens the first valve hole 316 in the contact state (the second state in FIG. 5C), the back pressure Pm in the first region S1 can be made faster. The secondary valve body 362 can be smoothly separated from the first valve seat 327 by raising it, and in the separated state (FIG. 5A), the refrigerant is discharged from the discharge chamber 142 through the second communication passage 363b. The crank chamber 140 can be appropriately supplied.
In the present embodiment, the first valve seat 327 is a recess 327a formed in a concave shape, and the recess 327a in which the other end of the first valve hole 316 is opened in the recess bottom and the recess bottom of the recess 327a The main valve body valve seat surface 327b formed around the first valve hole 316 and the sub valve body valve seat surface 327c formed around the recess 327a. Thus, in the second state shown in FIG. 5C, a region defined by the concave portion 327a of the first valve seat 327, the front end portion 362a2, and the end face of the sliding portion 362a1 on the first valve seat 327 side. The back pressure area (first area S1) can be formed. That is, the main valve body 351 abuts on the first valve seat 327 (more specifically, the main valve body valve seat surface 327b), and the sub valve body 362 is the first valve seat 327 (more specifically, the sub valve body valve seat surface A back pressure region (first region S1) can be formed between the sub valve body 362 and the main valve body valve seat surface 327 b in a state of being in contact with the 327 c). As a result, immediately after the peripheral portion on the first valve hole 316 side of the main valve body 351 is separated from the main valve body valve seat surface 327b in the second state shown in FIG. The back pressure Pm can be more rapidly raised by flowing into the back pressure region through the space between the peripheral portion 351 and the main valve body valve seat surface 327 b.
In the present embodiment, the sub valve body 362 is a receiving surface 366 with which the refrigerant flowing into the first communication passage 363 a via the second valve hole 320 collides, and the dynamic pressure in the direction approaching the first valve seat 327 Receiving surface 366. Thus, the dynamic pressure can be effectively received by the receiving surface 366 by the backflowing refrigerant flow, so that the sub valve body 362 can be smoothly moved toward the first valve seat 327. As a result, for example, even if the reduction of the back pressure Pm in the back pressure region (the first region S1) is insufficient, the sub valve body 362 is controlled from the first state (FIG. 5A) to the second state. In order to move it to the state (FIG. 5C), the sub valve body 362 is moved in the direction approaching the first valve seat 327 by the dynamic pressure acting on the receiving surface 366 without providing biasing means such as a spring. It can be done. Therefore, the pressure in the crank chamber 140 can be rapidly reduced (in other words, the delay in the pressure release of the crank chamber 140 can be prevented).
In the present embodiment, the receiving surface 366 includes a first receiving surface 366a, a second receiving surface 366b, and a third receiving surface 366c. The first receiving surface 366a is provided in the first sub-valve portion 362a, the second receiving surface 366b is provided in the second sub-valve portion 362b, and the third receiving surface 366c is a second region in the sliding portion 362a1. It comprises the end exposed to S2. Thus, the dynamic pressure due to the backflow of refrigerant can be reliably received by the second receiving surface 366b and the first receiving surface 366a in the first communication passage 363a, and the third communication passage 363b The receiving surface 366c can reliably receive pressure.
In the present embodiment, the main valve body unit 350 directs the refrigerant that has flowed into the portion of the first communication passage 363a corresponding to the first large diameter hole portion 364b via the second valve hole 320 toward the first receiving surface 366a. It has the 1st guidance part 353c which guides. Thereby, the dynamic pressure can be received more efficiently at the first receiving surface 366a.
In the present embodiment, the case 318 is fitted in the fitting hole 314 of the valve body 311, and the valve body 311 (specifically, the forming wall of the first valve chamber 315) cooperates with the case 318 to accommodate the valve. Although the chamber 321 is formed, the present invention is not limited to this. For example, the configurations of the first modification shown in FIG. 7 and the second modification shown in FIG. 8 can be adopted.
Specifically, in the first modification of control valve 300 shown in FIG. 7, case 318 is not provided. In the first modified example, a peripheral wall 316c fitted in the fitting hole 314 integrally with the partition member 361 extends toward the second valve hole 320, and a discharge hole 318c is opened in the peripheral wall 316c. The large diameter portion 342b of the fixed core 342 has a protrusion 342b1 protruding toward the first valve hole 316, and the end of the protrusion 342b1 is a second port in the fitting portion of the fitting hole 314. It is located in the predetermined position by the side of the 1st valve hole 316 from the opening position of H.323. The other end of the second valve hole 320 is opened at the center of the protrusion 342b1. Further, instead of the communication space portion 319, a communication passage 319 'communicating the one end of the second valve hole 320 and the second port 323 is formed in the inside of the projecting portion 342b1.
In the first modification, the large diameter portion 342b (projecting portion 342b1) of the fixed core 342 is fitted in the fitting hole 314, the protrusion 342b1 of the large diameter portion 342b on the first valve hole 316 side The end face abuts the end of the peripheral wall 316c. As a result, the valve accommodating chamber 321 is formed by the end face of the large diameter portion 342 b (projecting portion 342 b 1) of the fixed core 342, the inner peripheral surface of the peripheral wall 316 c and the inner peripheral surface of the forming wall of the first valve chamber 315 of the valve body 311. It is formed. And the annular part around the 2nd valve hole 320 in the above-mentioned end face of projection part 342b1 constitutes the 2nd valve seat 318f.
In other words, in the first modification, the valve body 311 forms the valve storage chamber 321 in cooperation with the peripheral wall 316 c of the dividing member 361 and the large diameter portion 342 b (more specifically, the protruding portion 342 b 1) of the fixed core 342. .
In the first modification, the second valve seat 318f can be formed using the end surface of the large diameter portion 342b of the fixed core 342 (specifically, the end surface of the protrusion 342b1). Further, by integrally forming a member (peripheral wall 316 c) corresponding to the peripheral wall 318 a of the case 318 with the partitioning member 361, the valve structure can be simplified.
Also in the second modification of control valve 300 shown in FIG. 8, case 318 is not provided. In the second modified example, a first valve chamber 315, a first valve hole 316 and an insertion hole 317 are formed in the valve body 311 sequentially from the other end surface (end surface on the solenoid unit 340 side) 311b side. The large diameter portion 342 b of the fixed core 342 is fitted in a fitting hole 341 d formed in the end wall portion 341 b of the solenoid housing 341. The large diameter portion 342 b of the fixed core 342 has a protruding portion 342 b 1 that protrudes toward the first valve hole 316. The protrusion 342b1 has, in order from the valve body 311 side, a first fitting hole 342b11, a second fitting hole 342b12 having a diameter smaller than that of the first fitting hole 342b11, and a cylindrical shape having a diameter smaller than that of the second fitting hole. A cylindrical space 342 b 13 is formed. A predetermined range on the other end surface 311b side of the valve body 311 is fitted into the first fitting hole 342b11, and the partitioning member 361 is fitted and positioned in the second fitting hole 342b12.
In the second modified example, the second sub valve portion 362 b is disposed in the cylindrical space portion 342 b 13. The third port 324 penetrates the peripheral wall of the protrusion 342b1 and opens in the cylindrical space 342b13, and the other end of the second valve hole 320 is open at the center of the bottom of the cylindrical space 342b13. ing. The second port 323 penetrates the peripheral wall of the protrusion 342 b 1 and is connected to the second valve hole 320. And the annular | circular shaped site | part around the 2nd valve hole 320 in the said bottom face of cylindrical space part 342b13 of protrusion part 342b1 comprises the 2nd valve seat 318f. Therefore, in the second modification, the second valve chamber 328 is formed of the cylindrical space 342b13, and the valve housing 321 is the inner circumferential surface of the cylindrical space 342b13 in the valve body 311 and the inner circumferential surface of the first fitting hole 342b11. And the inner peripheral surface of the forming wall of the first valve chamber 315 of the valve body 311.
In other words, in the second modified example, the valve body 311 forms the valve storage chamber 321 in cooperation with the large diameter portion 342 b (more specifically, the protrusion 342 b 1) of the fixed core 342.
Further, in the second modification, the valve housing 310, the solenoid housing 341, and the projecting portion 342b1 of the large diameter portion 342b of the fixed core 342 are control valves having an outer peripheral surface extending in one direction by fitting each other. It constitutes a housing. In the second modification, the control valve housing (310, 341, 342b1) corresponds to the "housing" according to the present invention.
In the second modification, the valve storage chamber 321 can be formed without providing the case 318, so the number of parts can be reduced. Further, the discharge internal passage 326 communicating between the pressure area of the suction chamber 141 and the valve storage chamber 321 can be formed with a simple structure by only the third port 324.
Moreover, in the present embodiment, the second communication passage throttle passage 363b2 is provided at the front end portion 362a2 of the first sub valve portion 362a, but the second communication passage throttle passage 363b2 may not be provided. In this case, when the sub valve body 362 abuts on the first valve seat 327, the second communication passage 363 b is closed. Thus, for example, in the second state shown in FIG. 5C, the back pressure region (in the state immediately after the peripheral portion on the first valve hole 316 side of the main valve body 351 is separated from the main valve body valve seat surface 327b The back pressure Pm in the first region S1) can be raised more quickly.
In the present embodiment, the pressure-sensitive device 330 operates in response to the pressure Ps in the suction chamber 141. However, the present invention is not limited to this, and is configured to operate in response to an appropriate external pressure. It is also good.
The present invention is not limited to the above-described embodiments, and it goes without saying that various modifications and changes are possible based on the technical idea of the present invention.

100: variable displacement compressor, 101a: cylinder bore (compression unit), 136: piston (compression unit), 140: crank chamber (control pressure chamber), 141: suction chamber, 142: discharge chamber, 145: supply passage, 146: ... Discharge passage 300: control valve 310: valve housing (housing) 316: first valve hole 320: second valve hole 321: valve storage chamber 325: back pressure relief throttle passage 326: discharge internal passage 327: first valve seat, 327a: recessed portion, 327b: valve seat surface for main valve body, 327c: valve seat surface for secondary valve body, 330: pressure-sensitive device, 341: solenoid housing (housing), 342b1: projecting portion (Housing), 340: Solenoid unit, 350: Main valve body unit, 351: Main valve body, 353c: First guide portion, 360: Secondary valve body unit, 362a: First secondary valve portion, 62 secondary valve body 363 communication passage 363a first communication passage 363b second communication passage 364 insertion hole 364a first small diameter hole portion 364b first large diameter hole portion 364c first 2 Small diameter hole portion, 364d: Second large diameter hole portion, 365: Throttling passage for the first communication passage, 366: Receiving surface, 366a: First receiving surface, 366b: Second receiving surface, S1: First region (back Pressure area)

Claims

According to the internal pressure, a suction chamber into which the refrigerant before compression is introduced, a compression unit for compressing the refrigerant in the suction chamber, a discharge chamber for discharging the refrigerant after compression compressed by the compression unit, and the internal pressure A control pressure chamber that changes a discharge capacity by changing it, and controls an opening degree of a supply passage that supplies the refrigerant in the discharge chamber to the control pressure chamber, and connects between the control pressure chamber and the suction chamber. A variable displacement compressor having a control valve for controlling the opening degree of a discharge passage, comprising:
The control valve is
A housing extending in one direction and having an outer peripheral surface, the valve storage chamber, a first valve hole having one end connected to the pressure area of the discharge chamber and the other end opening to the valve storage chamber, and one end the control pressure chamber A second valve hole connected to the pressure region of the valve and the other end opening to the valve chamber, and a discharge internal passage having one end connected to the pressure region of the suction chamber and the other end opening to the valve chamber When,
A first state is provided in the valve storage chamber and operates according to the back and forth differential pressure to communicate the first valve hole and the second valve hole, and communicates the second valve hole and the discharge internal passage. A sub valve body unit that controls the opening degree of the discharge passage by switching to a second state;
The sub valve body unit has a main valve body extending from one end to the other end of the sub valve body unit and opening and closing the first valve hole by coming into contact with the first valve seat around the first valve hole. A cylindrical main valve unit,
A solenoid unit that applies an urging force in a valve closing direction of the first valve hole to the main valve body unit;
A pressure-sensitive device that applies an urging force in the valve opening direction of the first valve hole to the main valve body unit in response to an external pressure;
Including
The sub valve unit is
The sub valve body includes a first sub valve portion disposed so as to surround the outer periphery of the main valve body and to be opposed to the first valve seat and has an outer peripheral surface in sliding contact with the inner peripheral surface of the valve storage chamber. And an auxiliary valve body in which an insertion hole for insertion of the main valve body unit is formed;
A communication passage for connecting the first valve hole and the second valve hole;
Including
In the sub valve body, when the main valve body is separated from the first valve seat and the pressure in the back pressure region between the first valve seat and the first sub valve portion is increased, the communication passage Communication between the first valve hole and the second valve hole and blocking communication between the second valve hole and the discharge internal passage, and the main valve body abuts on the first valve seat When the pressure in the back pressure region decreases, the communication between the first valve hole and the second valve hole is shut off, and the second valve hole is moved so as to communicate with the discharge internal passage. ,
The communication passage is a cylindrical first communication passage between the inner peripheral surface of the insertion hole of the sub valve body and the outer peripheral surface of the main valve body unit, and the outer peripheral surface side of the first sub valve portion. A variable displacement compressor, comprising: a second communication passage extending therethrough and communicating the back pressure region with the first communication passage.
The housing is formed with a back pressure throttling passage having one end opened to the outer peripheral surface of the housing and connected to the pressure area of the suction chamber and the other end opened to the back pressure area. The variable displacement compressor according to 1.
The other end of the first valve hole is opened to one end wall of the valve storage chamber, the other end of the second valve hole is opened to the other end wall of the valve storage chamber, and the other of the discharge internal passage The end is opened to the inner peripheral surface of the valve storage chamber,
In the first state, the auxiliary valve body unit separates the auxiliary valve body from the first valve seat and abuts on a second valve seat around the second valve hole, and in the second state The variable displacement compressor according to claim 1, wherein the auxiliary valve body is operated to abut the first valve seat and to be separated from the second valve seat.
The minimum passage cross-sectional area of the second communication passage is set larger than the minimum passage cross-sectional area of the first communication passage in a state where the sub valve body is separated from the first valve seat. The variable displacement compressor according to any one of ~ 3.
An end of the first communication passage on the first valve hole side constitutes a first communication passage throttle passage surrounding the main valve body,
The variable displacement compressor according to claim 3, wherein the second communication passage is closed when the sub valve body abuts on the first valve seat.
An end of the first communication passage on the first valve hole side constitutes a first communication passage throttle passage surrounding the main valve body,
The variable displacement compressor according to claim 3, wherein the second communication passage has a predetermined minimum passage cross-sectional area in a state where the sub valve body abuts on the first valve seat.
The first valve seat is
A concave portion formed in a concave shape, wherein the other end of the first valve hole is opened on the bottom surface of the concave portion;
An annular main valve body valve seat surface which is formed around the first valve hole in the concave portion bottom surface of the concave portion and in contact with the peripheral edge portion of the end portion on the first valve hole side of the main valve body;
An annular auxiliary valve body seat surface formed around the recess and in contact with a peripheral edge portion of an end portion of the auxiliary valve body on the first valve hole side;
7. The variable displacement compressor according to any one of claims 3 to 6, comprising
The sub valve body is a receiving surface on which the refrigerant flowing into the first communication passage via the second valve hole collides, and has a receiving surface receiving dynamic pressure in a direction approaching the first valve seat The variable displacement compressor according to any one of claims 3 to 7.
The insertion hole in the first sub valve portion, which is the first valve seat side end portion of the sub valve body, has a diameter larger than the first small diameter hole portion through which the main valve body is inserted and the first small diameter hole portion It is formed in a stepped cylindrical shape consisting of a first large diameter hole,
The variable displacement compressor according to claim 8, wherein the receiving surface includes an annular first receiving surface connecting between the first large diameter hole and the first small diameter hole.
The main valve body unit is a first guide for guiding the refrigerant, which has flowed into a portion corresponding to the first large diameter hole portion of the first communication passage via the second valve hole, toward the first receiving surface. The variable displacement compressor according to claim 9, comprising:
The insertion hole at the second valve seat side end of the sub valve body faces the second small diameter hole communicating with the first large diameter hole and the second valve seat, and the second small diameter hole from the second small diameter hole Stepped cylindrical shape with large diameter second large diameter hole,
The variable capacity according to any one of claims 8 to 10, wherein the receiving surface includes an annular second receiving surface connecting between the second large diameter hole and the second small diameter hole. Compressor.
12. The variable displacement compressor according to any one of claims 1 to 11, wherein the external pressure is a pressure of the suction chamber.