WO2018135602A1

WO2018135602A1 - Variable displacement compressor

Info

Publication number: WO2018135602A1
Application number: PCT/JP2018/001473
Authority: WO
Inventors: 知明松井; 崇戸井田; 田口　幸彦; 聖寺内; 篤史小澤
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: 2017-01-19
Filing date: 2018-01-12
Publication date: 2018-07-26
Also published as: JP2018115627A

Abstract

A variable displacement compressor, wherein a delay in the pressure discharge of a control pressure chamber such as a crank chamber is prevented. A switching valve (350) is provided nearer to a crank chamber (140) than is a control valve (300) of a pressure supply passage (145). The switching valve (350) is switched between a first state of allowing communication between a first valve hole (104c1) and a second valve hole (151a), and a second state of allowing communication between the second valve hole (151a) and a pressure discharge hole (351a1) that communicates with a suction chamber (141). The switching valve (350) includes a dividing member (351), a spool (352), and an internal passage (352e). The spool (352) comprises a first valve part (352a), a second valve part (352b), and a shaft part (352c). A first internal passage (352e1) of the internal passage (352e) extends, along an axis line O2, through the second valve part (352b) and the shaft part (352c) in the spool (352) to an area inside the first valve part (352a). The second valve part (352b) is formed integrally with the shaft part (352c).

Description

Variable capacity compressor

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

As an example of this type of variable capacity compressor, a variable capacity compressor described in Patent Document 1 includes a control valve that controls the opening of a pressure supply passage that communicates a discharge chamber and a crank chamber, and a switching valve. . The switching valve includes a first valve portion that opens and closes a pressure supply passage between the control valve and the crank chamber, a second valve portion that opens and closes a pressure release passage that communicates the crank chamber and the suction chamber, and A spool having a connecting portion that connects the first valve portion and the second valve portion, and a partition that divides a storage chamber in which the spool is stored into a first storage chamber and a second storage chamber along the axial direction. It is comprised including the member. When the pressure in the pressure supply passage between the control valve and the switching valve is higher than the pressure in the crank chamber, the spool moves in the housing chamber to the crank chamber side, so that the first The valve portion opens the pressure supply passage to supply refrigerant from the discharge chamber to the crank chamber, and the second valve portion is configured to minimize the opening of the pressure release passage. When the pressure in the pressure supply passage between the control valve and the switching valve is lower than the pressure in the crank chamber, the spool moves in the housing chamber toward the control valve, thereby A valve portion closes the pressure supply passage to prevent a reverse flow of refrigerant from the crank chamber toward the control valve, and the second valve portion is configured to maximize the opening of the pressure release passage. .

Japanese Patent Laid-Open No. 2006-108961

In the conventional variable capacity compressor, the spool is constituted by the first valve portion, the second valve portion, and the connecting portion, and the first valve portion is formed as an integral part with the shaft portion. On the other hand, the second valve portion is formed as a component different from the integrated component of the first valve portion and the shaft portion. Then, the shaft portion of the integral part is press-fitted into the second valve portion disposed inside the partition member in a state where the shaft portion of the integral component is inserted through the insertion hole formed in the partition member. Thus, the spool is configured.
Here, it is conceivable that the second valve portion is positioned by an appropriate jig during the press-fitting operation of the shaft portion of the integral part to the second valve portion.
However, since the second valve portion is located in a narrow space inside the partition member during the press-fitting operation, it is difficult to manufacture the jig for surely positioning the second valve portion. There is a case. In this case, there is a possibility that the second valve portion will move during the press-fitting operation, and the assembly accuracy of the spool may be lowered.
Accordingly, an object of the present invention is to provide a variable capacity compressor that can be easily assembled with a simple jig while maintaining the assembly accuracy of the spool of the switching valve.

According to one aspect of the present invention, the suction chamber into which the refrigerant is guided, the compression section that sucks and compresses the refrigerant in the suction chamber, the discharge chamber into which the refrigerant compressed by the compression section is discharged, and the control pressure chamber A variable capacity compressor is provided that has a discharge capacity that changes according to the pressure in the control pressure chamber. The variable capacity compressor includes a control valve, a switching valve, and a throttle passage. The control valve is provided in a pressure supply passage for supplying the refrigerant in the discharge chamber to the control pressure chamber, and controls the opening of the pressure supply passage. The switching valve is a switching valve provided closer to the control pressure chamber than the control valve in the pressure supply passage, and is a first valve hole communicating with the pressure supply passage between the control valve and the switching valve. A first state in which the second valve hole communicating with the pressure supply passage between the switching valve and the control pressure chamber communicates with the pressure relief hole communicated with the second valve hole and the suction chamber. The second state is switched to. The throttle passage communicates the pressure supply passage between the control valve and the switching valve and the suction chamber. The switching valve includes a partition member, a spool, and an internal passage. The partition member partitions the first valve chamber having the first valve hole and the second valve chamber having the second valve hole and the pressure release hole. The spool is disposed in the first valve chamber and opens and closes the first valve hole. The second valve portion is disposed in the second valve chamber and opens and closes the second valve hole. A spool comprising a shaft portion that connects one valve portion and the second valve portion, and has a circular cross section and is connected to an axis line connecting the hole center of the first valve hole and the hole center of the second valve hole. And extending through the partition member. The internal passage is an internal passage for communicating the first valve hole and the second valve hole, and penetrates the spool. When the pressure in the pressure supply passage between the control valve and the switching valve is higher than the pressure in the control pressure chamber, the spool has the first valve hole and the second valve hole through the internal passage. And the communication between the second valve hole and the pressure release hole is blocked, and the pressure in the pressure supply passage between the control valve and the switching valve is lower than the pressure in the control pressure chamber, The first valve hole and the second valve hole are disconnected from each other and moved so as to communicate the second valve hole and the pressure relief hole. The internal passage extends along the axis from the end face of the second valve portion on the second valve hole side to the region in the first valve portion through the second valve portion and the shaft portion. A second passage that passes through the peripheral wall of the first valve portion and communicates with the region in the first valve portion, the formation wall of the first valve chamber, and the outer peripheral surface of the first valve portion. It consists of an internal passage. The second valve portion is formed integrally with the shaft portion.

According to the variable capacity compressor according to the one aspect of the present invention, the first internal passage of the internal passage penetrating the spool in the switching valve is from an end surface of the second valve portion on the second valve hole side. It extends along the axis connecting the hole center of the first valve hole and the hole center of the second valve hole to the region in the first valve part via the inside of the second valve part and the shaft part. The second valve portion is formed integrally with the shaft portion. That is, the integral part of the second valve portion and the shaft portion has a relatively long through hole that forms a part of the first internal passage and extends along the axis.
Therefore, in the press-fitting operation in the assembly of the spool, for example, a simple jig with a cylindrical pin protruding is prepared, and the penetration that constitutes a part of the first internal passage in the integral part By inserting the pin into the hole, the second valve portion can be stably positioned with respect to the jig together with the shaft portion. Since the first internal passage extends to a region in the first valve portion, the length of the pin is such that, for example, the pin protrudes from the end portion of the shaft portion in a state where the integrated part is positioned. If the length is set, when the first valve portion is press-fitted into the shaft portion of the integral part, the pin is inserted into the first internal passage on the first valve portion side to Can guide the movement. In this way, by inserting the pin through the first internal passage, it is possible to guide the positioning of the integral part of the second valve portion and the shaft portion and the movement of the first valve portion during press-fitting. Therefore, the spool can be easily assembled with a simple jig while maintaining the assembly accuracy of the spool of the switching valve.

It is sectional drawing of the variable capacity compressor in one Embodiment of this invention. It is sectional drawing of the control valve of the said variable capacity compressor. FIG. 4 is a cross-sectional view of a switching valve of the variable capacity compressor, where (a) is a cross-sectional view showing a pressure supply state (first state) to the crank chamber, and (b) is a pressure release state (second state) from the crank chamber. FIG. It is a diagram which shows the correlation with the coil energization amount of the said control valve, and setting pressure. It is sectional drawing of the division member of the said switching valve. It is sectional drawing of the 1st valve part of the said switching valve. It is sectional drawing of the integral component of the 2nd valve part and axial part of the said switching valve. It is sectional drawing of the assembly of the spool and partition member which consist of a said 1st valve part, a said 2nd valve part, and the said axial part. It is a conceptual diagram for demonstrating the assembly procedure of the said spool. It is an expanded sectional view of the joined part of the 1st valve part of the switching valve, and the axial part. It is a figure which shows the modification of the said switching valve.

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.
FIG. 1 illustrates a variable capacity clutchless compressor applied to a vehicle air conditioner system (air conditioner system).
A variable capacity compressor 100 shown in FIG. 1 includes a cylinder block 101 having a plurality of cylinder bores 101a, a front housing 102 provided at one end of the cylinder block 101, and a valve plate 103 at the other end of the cylinder block 101. And a cylinder head 104 provided. A crank chamber 140 as a control pressure chamber is formed by the cylinder block 101 and the front housing 102, and the drive shaft 110 is provided across the crank chamber 140.
A swash plate 111 is disposed around an intermediate portion in the extending direction of the axis O1 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 the tilt angle with respect to the axis O1 can be changed. The link mechanism 120 includes a first arm 112 a projecting from the rotor 112, a second arm 111 a projecting from the swash plate 111, and one end pivotable to the first arm 112 a via the first connecting pin 122. And a link arm 121 having the other end rotatably connected to the second arm 111a via a second connection pin 123.
The through hole 111b of the swash plate 111 is formed in a shape that allows the swash plate 111 to tilt within a range between the maximum inclination angle and the minimum inclination angle. ) Is formed. When the inclination angle of the swash plate 111 when the swash plate 111 is orthogonal to the drive shaft 110 is set to 0 deg, the minimum inclination restriction portion of the through hole 111b is formed so that the swash plate 111 can be inclined to approximately 0 deg. Further, the maximum inclination angle of the swash plate 111 is regulated by the swash plate 111 coming into contact with the rotor 112.
Between the rotor 112 and the swash plate 111, an inclination-decreasing spring 114 that biases the swash plate 111 toward the minimum inclination angle is mounted, and between the swash plate 111 and the spring support member 116 provided on the drive shaft 110. Is attached with an inclination increasing spring 115 that urges the swash plate 111 in an increasing direction. Here, the biasing force of the tilt-increasing spring 115 at the minimum tilt angle is set larger than the biasing force of the tilt-decreasing spring 114, and when the drive shaft 110 is not rotating, the swash plate 111 is The urging force and the urging force of the inclination increasing spring 115 are positioned at an inclination angle that balances.
One end of the drive shaft 110 extends through the boss portion 102a protruding outside the front housing 102 to the outside of the front housing 102, and is connected to a power transmission device (not shown). A shaft seal device 130 is inserted between the drive shaft 110 and the boss portion 102a to shut off the crank chamber 140 and the external space.
A 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 a bearing 133 and a thrust plate 134 in the thrust direction. The power from the external drive source is transmitted to the power transmission device, and the drive shaft 110 can rotate in synchronization with the rotation of the power transmission device. The gap between the portion of the drive shaft 110 with which the thrust plate 134 abuts and the thrust plate 134 is adjusted to a predetermined gap by the adjustment screw 135.
A piston 136 is disposed in the cylinder bore 101a, and an outer peripheral portion of the swash plate 111 is accommodated in an inner space of an end portion of the piston 136 that protrudes toward the crank chamber 140. The swash plate 111 includes a pair of shoes 137. It is comprised so that it may interlock with piston 136 via. The piston 136 reciprocates in the cylinder bore 101 a by the rotation of the swash plate 111. In the cylinder head 104, a suction chamber 141 is formed at the center, and a discharge chamber 142 that surrounds the radially outer side of the suction chamber 141 in a ring shape is defined.
The suction chamber 141 and the cylinder bore 101a communicate with each other via a communication hole 103a provided in the valve plate 103 and a suction valve (not shown) formed in the suction valve forming plate 150. The discharge chamber 142 and the cylinder bore 101 a communicate with each other through a discharge valve (not shown) formed in the discharge valve forming plate 151 and a communication hole 103 b provided in the valve plate 103. The front housing 102, the center gasket (not shown), the cylinder block 101, the cylinder gasket 152, the suction valve forming plate 150, the valve plate 103, the discharge valve forming plate 151, the head gasket 153, and the cylinder head 104 are sequentially connected. The compressor housing is formed by being fastened by a plurality of through bolts 105.
Further, a muffler is provided on the upper portion of the cylinder block 101 in FIG. The muffler is formed by fastening a lid member 106 where the discharge port 106a is opened and a forming wall 101b formed in the upper part of the cylinder block 101 with a bolt via a seal member (not shown). A discharge check valve 200 is disposed in a muffler space 143 surrounded by the lid member 106 and the forming wall 101b.
The discharge check valve 200 is disposed at a connection portion between the communication path 144 that connects the discharge chamber 142 and the muffler space 143 and the muffler space 143, and is connected to the communication path 144 (upstream side) and the muffler space 143 (downstream side). It operates in response to the pressure difference. When the pressure difference is smaller than the predetermined value, the communication path 144 is shut off, and when the pressure difference is larger than the predetermined value, the communication path 144 is opened. Accordingly, the discharge chamber 142 is connected to the refrigerant circuit (the high-pressure side) of the air conditioner system via the discharge passage formed by the communication passage 144, the discharge check valve 200, the muffler space 143, and the discharge port 106a.
In the cylinder head 104, a suction passage (not shown) and a suction passage constituted by a communication passage 104 a are linearly extended from the radially outer side of the cylinder head 104 so as to cross a part of the discharge chamber 142. The suction chamber 141 is connected to the suction side refrigerant circuit of the air conditioner system via the suction passage.
The refrigerant on the low pressure side of the refrigerant circuit of the air conditioning system is guided to the suction chamber 141 through the suction passage. The refrigerant in the suction chamber 141 is sucked into the cylinder bore 101a by the reciprocating motion of the piston 136, compressed, and discharged into the discharge chamber 142. That is, in this embodiment, the cylinder bore 101a and the piston 136 constitute a compression unit that sucks and compresses the refrigerant in the suction chamber 141. Then, the refrigerant discharged to the discharge chamber 142 (refrigerant compressed by the compression unit) is guided to the high-pressure side of the refrigerant circuit of the air conditioner system through the discharge passage.
A pressure supply passage 145 for supplying the refrigerant in the discharge chamber 142 to the crank chamber 140 is formed in the cylinder head 104. A control valve 300 and a switching valve 350 are provided in the pressure supply passage 145. The switching valve 350 is disposed downstream of the control valve 300 in the pressure supply passage 145 (on the crank chamber 140 side). Specifically, the control valve 300 is disposed in the accommodation hole 104b, and the switching valve 350 is disposed in the accommodation chamber 104c formed on the downstream side of the control valve 300 in the pressure supply passage 145.
As will be described in detail later, in this embodiment, the pressure supply passage 145 includes a communication passage 104e formed in the cylinder head 104 and an accommodation hole 104b of the control valve 300, as shown in FIG. 1 and FIG. , Communication passage 104f, first valve hole 104c1 (see FIG. 3A), first region S11 of the first valve chamber S1 (see FIG. 3A), internal passage 352 (see FIG. 3A), The second valve hole 151a (see FIG. 3A), the communication hole of the valve plate 103, the communication hole of the suction valve forming plate 150, the communication hole of the cylinder gasket 152, and the communication path 101e.
FIG. 2 is a cross-sectional view of the control valve 300. The control valve 300 is a valve that controls the opening area (opening degree) of the pressure supply passage 145. Specifically, as shown in FIG. 1, the accommodation hole 104b formed along the radial direction of the cylinder head 104. Is housed in. In the present embodiment, the control valve 300 is provided with O-rings 300a to 300c, and the O-rings 300a to 300c have a region A communicating with the suction chamber 141 through the communication passage 104d in the accommodation hole 104b. A region B communicating with the discharge chamber 142 via the communication passage 104e and a region C communicating with the storage chamber 104c via the communication passage 104f are partitioned. The B region and the C region of the accommodation hole 104 b constitute a part of the pressure supply passage 145. The control valve 300 adjusts the opening of the pressure supply passage 145 in response to the pressure of the suction chamber 141 introduced through the communication passage 104d and the electromagnetic force generated by the current flowing through the solenoid in response to the external signal, The discharge gas introduction amount (pressure supply amount) to the crank chamber 140 is controlled.
FIG. 3 is a cross-sectional view of the switching valve 350. The switching valve 350 is a valve that switches between a first state shown in FIG. 3A and a second state shown in FIG. The switching valve 350 includes a first valve portion 352a for opening and closing a pressure supply passage 145 between the control valve 300 and the crank chamber 140, and a pressure release passage 146 that communicates the crank chamber 140 and the suction chamber 141. It includes a spool 352 having a second valve portion 352b for opening and closing a first pressure release passage 146a described later.
The spool 352 moves according to the difference between the pressure in the pressure supply passage 145 between the control valve 300 and the switching valve 350 and the pressure in the crank chamber 140, whereby the switching valve 350 is controlled from the crank chamber 140 side. It has a function as a check valve for preventing the reverse flow of the refrigerant (fluid) toward the valve 300 and a function for controlling the discharge of the refrigerant from the crank chamber 140 to the suction chamber 141.
In the present embodiment, a first pressure release passage 146a and a second pressure release passage 146b are provided as the pressure release passage 146 for discharging the refrigerant in the crank chamber 140 to the suction chamber 141.
As will be described in detail later, in the present embodiment, as shown in FIGS. 1 and 3B, the first pressure release passage 146a includes a communication passage 101e formed in the cylinder block 101, a communication hole of the cylinder gasket 152, The communication hole of the suction valve forming plate 150, the communication hole of the valve plate 103, the second valve hole 151a (see FIG. 3 (b)), and the gap G between the second valve portion 352b of the switching valve 350 and the second valve seat 151b ( 3 (see FIG. 3B), the second valve chamber S2 (see FIG. 3B), and the pressure release hole 351a1 (see FIG. 3), which are opened and closed by the switching valve 350 via the switching valve 350. That is, as will be described later, the second valve hole 151a, the communication hole of the valve plate 103, the communication hole of the suction valve forming plate 150, the communication hole of the cylinder gasket 152, and the communication path 101e (hereinafter, these are collectively referred to as “shared path”. ") Also serves as the first pressure relief passage 146a and the pressure supply passage 145, and the refrigerant flow direction is reversed when the pressure is released from the crank chamber 140 and when the pressure is supplied to the crank chamber 140.
Further, in the present embodiment, the second pressure release passage 146b passes through the end face of the cylinder block 101 on the front housing 102 side and extends to the cylinder head 104 side, and the end face of the cylinder block 101 on the cylinder head 104 side. It is provided so as to bypass the switching valve 350 via the opening space 101 d and the fixed throttle 103 c formed in the valve plate 103.
The flow passage cross-sectional area of the first pressure relief passage 146a when opened by the switching valve 350 is set larger than the flow passage cross-sectional area of the fixed throttle 103c of the second pressure relief passage 146b.
When the control valve 300 is closed and the pressure in the pressure supply passage 145 between the control valve 300 and the switching valve 350 becomes lower than the pressure in the crank chamber 140, the switching valve 350 is moved to the pressure supply passage 145 (in detail, The first valve hole 104c1 which will be described in detail later is closed to prevent the reverse flow of the refrigerant from the crank chamber 140 side toward the control valve 300, while the first pressure release passage 146a (the second valve portion which will be described in detail later). The opening of the gap G) between 352b and the second valve seat 151b is set to the maximum opening. As a result, the refrigerant in the crank chamber 140 is quickly discharged to the suction chamber 141 via the first pressure release passage 146a and the second pressure release passage 146b, and the pressure in the crank chamber 140 becomes equal to the pressure in the suction chamber 141. The inclination angle of the swash plate 111 is maximized, and the piston stroke (discharge capacity) is maximized.
Further, when the control valve 300 is opened and the pressure in the pressure supply passage 145 between the control valve 300 and the switching valve 350 becomes higher than the pressure in the crank chamber 140, the switching valve 350 is connected to the pressure supply passage 145 (in detail, The first valve hole 104c1), which will be described in detail later, is opened and the first pressure release passage 146a is closed (specifically, the second valve portion 352b, which will be described in detail later, is brought into contact with the second valve seat 151b). Has been. As a result, the flow direction of the refrigerant in the shared passage is opposite to that when the control valve 300 is closed. As a result, the refrigerant in the discharge chamber 142 is supplied to the crank chamber 140 via the pressure supply passage 145 (specifically, the dual-purpose passage), while the refrigerant in the crank chamber 140 is sucked through the dual-purpose passage. As a result, the pressure in the crank chamber 140 is likely to increase due to the restriction of the outflow to the chamber 141, and the pressure in the crank chamber 140 increases according to the opening degree of the control valve 300, and the inclination angle of the swash plate 111 decreases from the maximum. In addition, the piston stroke can be variably controlled.
As described above, the variable capacity compressor 100 includes the suction chamber 141, the compression unit, the discharge chamber 142, and the crank chamber 140 as a control pressure chamber, and the discharge capacity changes according to the pressure of the crank chamber 140. In other words, it is a compressor whose discharge capacity is controlled by pressure regulation in the crank chamber 140.
Next, the structure of the control valve 300 will be described in detail. The structure and operation of the switching valve 350 will be described in detail later.
`` Control valve ''
The control valve 300 includes a valve unit and a drive unit (solenoid) that opens and closes the valve unit.
The valve unit of the control valve 300 includes a cylindrical valve housing 301. In the valve housing 301, a first pressure sensing chamber 302, a valve chamber 303, and a second pressure sensing chamber 307 are sequentially arranged in the axial direction. It is formed side by side.
The first pressure sensing chamber 302 communicates with the crank chamber 140 through a communication hole 301 a formed in the outer peripheral surface of the valve housing 301, an accommodation hole 104 b formed in the cylinder head 104, and a communication passage 104 f.
The second pressure sensing chamber 307 communicates with the suction chamber 141 through a communication hole 301 e formed in the outer peripheral surface of the valve housing 301 and a communication passage 104 d formed in the cylinder head 104. The valve chamber 303 communicates with the discharge chamber 142 via a communication hole 301 b formed in the outer peripheral surface of the valve housing 301 and a communication passage 104 e formed in the cylinder head 104. The first pressure sensing chamber 302 and the valve chamber 303 can communicate with each other through a valve hole 301c.
A support hole 301 d is formed between the valve chamber 303 and the second pressure sensing chamber 307. A bellows 305 is disposed in the first pressure sensing chamber 302. The bellows 305 has a built-in spring and has a built-in spring. The bellows 305 is disposed so as to be displaceable in the axial direction of the valve housing 301, and serves as a pressure sensing means for receiving the pressure in the first pressure sensing chamber 302, that is, the crank chamber 140. It has a function.
A cylindrical valve body 304 is accommodated in the valve chamber 303. The valve body 304 can slide in the support hole 301 d while the outer peripheral surface is in close contact with the inner peripheral surface of the support hole 301 d, and can move in the axial direction of the valve housing 301. One end of the valve body 304 can open and close the valve hole 301 c, and the other end of the valve body 304 protrudes into the second pressure sensing chamber 307. One end of a rod-shaped connecting portion 306 is fixed to one end of the valve body 304. The other end of the connecting portion 306 is disposed so as to be able to contact the bellows 305 and has a function of transmitting the displacement of the bellows 305 to the valve body 304.
The drive unit of the control valve 300 has a cylindrical solenoid housing 312 that is coaxially connected to the other end of the valve housing 301. The solenoid housing 312 houses a molded coil 314 in which the electromagnetic coil is covered with resin. The solenoid housing 312 accommodates a cylindrical fixed core 310 concentrically with the mold coil 314, and the fixed core 310 extends from the valve housing 301 to the vicinity of the center of the mold coil 314. The end of the fixed core 310 on the side opposite to the valve housing 301 is surrounded by a cylindrical sleeve 313. The fixed core 310 has an insertion hole 310 a in the center, and one end of the insertion hole 310 a opens into the second pressure sensing chamber 307. A cylindrical movable core 308 is accommodated between the fixed core 310 and the closed end of the sleeve 313.
A solenoid rod 309 is inserted into the insertion hole 310a, and one end of the solenoid rod 309 is fixed to the proximal end side of the valve body 304 by press fitting. The other end of the solenoid rod 309 is press-fitted into a through hole formed in the movable core 308, and the solenoid rod 309 and the movable core 308 are integrated. A release spring 311 is provided between the fixed core 310 and the movable core 308 to urge the movable core 308 in a direction away from the fixed core 310 (valve opening direction).
The movable core 308, the fixed core 310, and the solenoid housing 312 are formed of a magnetic material and constitute a magnetic circuit. The sleeve 313 is made of a nonmagnetic material such as a stainless steel material. A control device provided outside the variable capacity compressor 100 is connected to the mold coil 314 via a signal line. The mold coil 314 generates an electromagnetic force F (i) when a control current i is supplied from the control device. The electromagnetic force F (i) of the mold coil 314 attracts the movable core 308 toward the fixed core 310 and drives the valve body 304 in the valve closing direction.
The valve body 304 of the control valve 300 includes an urging force fs due to the release spring 311, a force due to the pressure in the valve chamber 303 (discharge pressure Pd), the first pressure sensing chamber, in addition to the electromagnetic force F (i) due to the mold coil 314. A force due to the pressure 302 (crank chamber pressure Pc), a force due to the pressure in the second pressure sensing chamber 307 (suction pressure Ps), and a biasing force F due to a spring built in the bellows 305 act.
Here, the effective pressure receiving area Sb in the expansion / contraction direction of the bellows 305, the pressure receiving area Sv of the crank chamber acting on the valve body 304 from the valve hole 301c side, and the cross-sectional area Sr of the cylindrical outer peripheral surface of the valve body 304 are Sb = Sv = Sr. Therefore, the relationship between the forces acting on the valve body 304 is expressed by Equation 1. In Equation 1, “+” indicates the valve closing direction of the valve body 304, and “−” indicates the valve opening direction.

The connecting body of the bellows 305, the connecting portion 306, and the valve body 304 reduces the pressure of the crank chamber 140 by reducing the opening of the pressure supply passage 145 in order to increase the discharge capacity when the pressure of the suction chamber 141 becomes higher than the set pressure. When the pressure in the suction chamber 141 falls below the set pressure, the opening of the pressure supply passage 145 is increased to increase the pressure in the crank chamber 140 in order to reduce the discharge capacity. That is, the control valve 300 autonomously controls the opening degree (opening area) of the pressure supply passage 145 so that the pressure in the suction chamber 141 approaches the set pressure.
FIG. 4 is a diagram showing the correlation between the coil energization amount of the control valve 300 and the set pressure. Since the electromagnetic force of the mold coil 314 acts on the valve body 304 via the solenoid rod 309 in the valve closing direction, the force in the direction to reduce the opening of the pressure supply passage 145 when the energization amount to the mold coil 314 increases. Increases, and the set pressure changes in the decreasing direction as shown in FIG. The control device (drive unit) controls energization to the mold coil 314 by pulse width modulation (PWM control) at a predetermined frequency in the range of, for example, 400 Hz to 500 Hz, and the current value flowing through the mold coil 314 becomes a desired value. The pulse width (duty ratio) is changed as follows.
When the air conditioning system is in operation, that is, in the operating state of the variable capacity compressor 100, the energization amount to the mold coil 314 is adjusted by the controller based on the air conditioning setting such as the set temperature and the external environment, and the pressure in the suction chamber 141 is energized. The discharge capacity is controlled so that the set pressure corresponds to the amount. Further, when the air conditioner system is not operated, that is, when the variable capacity compressor 100 is not operated, the control device turns off the energization to the mold coil 314. Thereby, the pressure supply passage 145 is opened by the release spring 311, and the discharge capacity of the variable capacity compressor 100 is controlled to the minimum state.
Next, the structure and operation of the switching valve 350 will be described in detail with reference to FIG. 1, FIG. 3, and FIG. FIGS. 3A and 3B are longitudinal sectional views showing an example of the switching valve 350 disposed in the cylinder head 104, and FIG. 3A is a state of pressure supply to the crank chamber 140 (first state). 1 (b), and FIG. 3 (b) shows a pressure release state from the crank chamber 140 (second state). 5 to 7 are cross-sectional views of components of the switching valve 350, respectively. FIG. 8 is a cross-sectional view of an assembly of the spool 352 of the switching valve 350 and a partition member 351 described later.
`` Switching valve ''
As shown in FIGS. 1 and 3, the switching valve 350 is provided in the storage chamber 104 c formed on the crank chamber 140 side of the control valve 300 in the pressure supply passage 145, and has a first state and a second state. It is a valve that switches to. In the first state, the switching valve 350 is connected to the first valve hole 104c1 communicating with the pressure supply passage 145 between the control valve 300 and the switching valve 350, and the pressure supply passage 145 between the switching valve 350 and the crank chamber 140. The communicating second valve hole 151a is communicated, and in the second state, the second valve hole 151a and the pressure release hole 351a1 communicating with the suction chamber 141 are communicated.
The switching valve 350 includes a partition member 351 (see FIGS. 3 and 5) fixed in the storage chamber 104c, and a spool 352 (see FIGS. 3 and 5 to 7) that is stored in the storage chamber 104c and moves in the storage chamber 104c. Reference) and an internal passage 352e (see FIG. 3) formed in the spool 352.
The partition member 351 is a member that partitions the first valve chamber S1 having the first valve hole 104c1 and the second valve chamber S2 having the pressure relief hole 351a1 communicating with the second valve hole 151a and the suction chamber 141. The storage chamber 104 c is formed on the open end face side of the cylinder head 104 and opens to the suction chamber 141.
The first valve hole 104c1 opens on one end side in the moving direction of the spool 352 in the accommodation chamber 104c (first valve chamber S1). The first valve hole 104c1 communicates with the downstream side of the valve hole 301c of the control valve 300 via the communication path 104f. That is, the first valve hole 104c1 communicates with the discharge chamber 142 via the communication path 104f, the accommodation hole 104b, the control valve 300, and the communication path 104e.
The second valve hole 151a opens to the other end side in the moving direction of the spool 352 in the accommodation chamber 104c (second valve chamber S2). The second valve hole 151 a communicates with the crank chamber 140 through a communication hole of the valve plate 103, a communication hole of the suction valve forming plate 150, a communication hole of the cylinder gasket 152, and a communication path 101 e formed in the cylinder block 101.
The pressure release hole 351a1 is directly open to the suction chamber 141 in order to communicate the second valve chamber S2 and the suction chamber 141. In the present embodiment, the storage chamber 104c opens into the suction chamber 141, and the second valve chamber S2 and the suction chamber 141 communicate with each other through the pressure release hole 351a1, but the present invention is not limited to this. For example, the storage chamber 104c is not directly opened into the suction chamber 141, but a communication hole is formed in the wall (the wall at the open end of the cylinder head 104) between the suction chamber 141 and the storage chamber 104c. The second valve chamber S2 and the suction chamber 141 may be communicated with each other through the hole 351a1.
The spool 352 connects the first valve portion 352a disposed in the first valve chamber S1, the second valve portion 352b disposed in the second valve chamber S2, and the first valve portion 352a and the second valve portion 352b. The shaft portion 352c has a circular cross section, extends along the axis O2 connecting the hole center of the first valve hole 104c1 and the hole center of the second valve hole 151a, and penetrates the partition member 351. The axis of the spool 352 coincides with the axis O2, for example.
The first valve portion 352a opens and closes the first valve hole 104c1 by being separated from and contacting a first valve seat 104c2 provided around the first valve hole 104c1. The second valve portion 352b opens and closes the second valve hole 151a by being separated from and contacting a second valve seat 151b provided around the second valve hole 151a. The shaft portion 352c is formed in a cylindrical shape, for example, and has a shaft outer diameter that penetrates the partition member 351 and is smaller than the outer diameters of the first valve portion 352a and the second valve portion 352b.
The second valve portion 352b is formed integrally with the shaft portion 352c, and the first valve portion 352a is formed separately from the shaft portion 352c and the second valve portion 352b. That is, the second valve part 352b is formed as an integral part with the shaft part 352c, while the first valve part 352a is formed as a separate part from the integral part of the second valve part 352b and the shaft part 352c. .
The internal passage 352e is a passage for communicating the first valve hole 104c1 and the second valve hole 151a, and is formed to penetrate the spool 352. The internal passage 352e includes a first internal passage 352e1 and a second internal passage 352e2.
The first internal passage 352e1 extends along the axis O2 from the end surface of the second valve portion 352b on the second valve hole 151a side to the region in the first valve portion 352a through the second valve portion 352b and the shaft portion 352c. It is formed to extend. The first internal passage 352e1 extends, for example, so that its axis coincides with an axis O2 connecting the hole center of the first valve hole 104c1 and the hole center of the second valve hole 151a. For example, one end of the first internal passage 352e1 is located on the first valve hole 104c1 side of the first valve portion 352a and is closed, and the other end is opened on the end surface of the second valve portion 352b on the second valve seat 151b side. is doing. An annular projecting portion 352b1 of the second valve portion 352b is disposed so as to surround the periphery of the other end opening of the first internal passage 352e1.
The second internal passage 352e2 penetrates the peripheral wall of the first valve portion 352a, and the region in the first valve portion 352a in the first internal passage 352e1, the formation wall of the first valve chamber S1, and the first valve portion 352a. The passage communicates with the area between the outer peripheral surface. For example, the second internal passage 352e2 is formed at a plurality of angular positions that are separated in the circumferential direction of the first valve portion 352a, and extends in the radial direction of the first valve portion 352a.
When the pressure in the communication path 104f (the pressure supply path 145 between the control valve 300 and the switching valve 350) is higher than the pressure in the communication path 101e (the crank chamber 140), the spool 352 causes the pressure difference in FIG. As shown in FIG. 3A, the first valve portion 352a moves away from the first valve seat 104c2, and the second valve portion 352b contacts the second valve seat 151b. Thus, the spool 352 communicates the first valve hole 104c1 and the second valve hole 151a via the internal passage 352e and blocks communication between the second valve hole 151a and the pressure release hole 351a1.
Further, when the pressure of the communication path 104f is lower than the pressure of the communication path 101e, the spool 352 moves to the right in FIG. 3 due to this pressure difference, and as shown in FIG. The part 352a contacts the first valve seat 104c2, and the second valve part 352b is separated from the second valve seat 151b. Thus, the spool 352 blocks communication between the first valve hole 104c1 and the second valve hole 151a and connects the second valve hole 151a and the pressure release hole 351a1.
Hereinafter, the configuration of the switching valve 350 will be described in more detail.
"Containment chamber and blocking member"
The storage chamber 104c extends along an axis O2 connecting the hole center of the first valve hole 104c1 and the hole center of the second valve hole 151a, and is formed in a stepped columnar shape. The cylindrical central axis of the storage chamber 104c coincides with the axis O2 and extends parallel to the axis O1 of the drive shaft 110. That is, the axis O2 coincides with the cylinder central axis of the storage chamber 104c, the axis of the spool 352, and the axis of the first internal passage 352e1. Specifically, the storage chamber 104c has a large-diameter portion 104c3 on the open end surface side (side closer to the crank chamber 140) of the cylinder head 104 and a back side (side far from the crank chamber 140) that is continuous with the large-diameter portion 104c3. The small-diameter portion 104c4 extends in the direction and has a smaller diameter than the large-diameter portion 104c3. A part of the cylinder head 104 forming wall that forms the large-diameter portion 104c3 is notched on the open end face side, and the opening end side of the storage chamber 104c is directly open to the suction chamber 141.
A second valve hole 151a is opened in the discharge valve forming plate 151, and a second valve seat 151b is formed at the periphery of the opening of the second valve hole 151a. The large diameter portion 104c3 (second valve chamber S2) includes a second valve hole 151a, a communication hole of the valve plate 103, a communication hole of the suction valve forming plate 150, a communication hole of the cylinder gasket 152, and a communication formed in the cylinder block 101. The crank chamber 140 communicates with the passage 101e.
A first valve seat 104c2 is formed on the end face 104c21 in the direction of the axis O2 constituting the small diameter portion 104c4. A first valve hole 104c1 is opened inside the first valve seat 104c2. The first valve seat 104c2 and the second valve seat 151b are formed so as to be orthogonal to the moving direction of the spool 352 (that is, the extending direction of the axis O2). The first valve hole 104c1 communicates with a region in the accommodation hole 104b downstream of the valve hole 301c of the control valve 300 via a communication path 104f extending coaxially with the accommodation chamber 104c. A region in the accommodation hole 104b downstream of the valve hole 301c of the control valve 300 communicates with the discharge chamber 142 via the control valve 300 and the communication path 104e, and the first valve hole 104c1 includes a pressure supply path including the communication path 104f. It communicates with the discharge chamber 142 via 145. The small diameter portion 104c4 (first valve chamber S1) constitutes a part of the pressure supply passage 145 and constitutes a so-called back pressure chamber of the switching valve 350.
`` Division member ''
The partition member 351 is made of, for example, a metal material, is press-fitted into the large-diameter portion 104c3 of the storage chamber 104c, has an open end on the second valve hole 151a side, and is formed in a substantially bottomed cylindrical shape. Specifically, the partition member 351 includes a cylindrical tubular body 351a and a disk-shaped end wall 351b provided at one end of the tubular body 351a on the first valve hole 104c1 side. The partition member 351 includes a first valve chamber S1 formed mainly by the small diameter portion 104c4 in the accommodation chamber 104c by press-fitting and fixing the cylindrical body 351a to the inner peripheral surface of the large diameter portion 104c3 of the accommodation chamber 104c. And a second valve chamber S2 on the discharge valve forming plate 151 side formed inside the cylindrical body 351a.
A pressure release hole 351a1 is formed in the cylindrical body 351a of the partition member 351. The pressure release holes 351a1 are formed, for example, at a plurality of locations separated in the circumferential direction of the cylindrical body 351a, and extend in the radial direction of the cylindrical body 351a. The second valve chamber S2 communicates with the suction chamber 141 through the pressure release hole 351a1. The partition member 351 is positioned in the large-diameter portion 104c3 of the storage chamber 104c so that the other end 351a2 of the cylindrical body 351a contacts the discharge valve forming plate 151.
In the present embodiment, the partition member 351 has an insertion hole 351b1 into which the shaft portion 352c of the spool 352 can be inserted. Specifically, the insertion hole 351b1 is formed in the center portion of the end wall 351b of the partition member 351 with the hole center aligned with the axis O2. An annular projecting portion 351b2 that surrounds the insertion hole 351b1 and projects toward the first valve chamber S1 is formed on the surface of the end wall 351b of the partition member 351 opposite to the cylinder 351a.
"spool"
In the present embodiment, the first valve portion 352a includes a sliding portion 352a1, a front end portion 352a2, and a rear end portion 352a3.
The sliding portion 352a1 has an outer peripheral surface that is in sliding contact with the inner peripheral surface of the first valve chamber S1, and the first valve chamber S1 is divided into a first region S11 on the first valve hole 104c1 side and a second region on the partition member 351 side. Partition with S12. The sliding portion 352a1 is generally formed in an annular shape and has an outer diameter larger than the outer diameters of the front end portion 352a2 and the rear end portion 352a3. The outer peripheral surface of the sliding part 352a1 is slidably supported on the inner peripheral surface of the first valve chamber S1. The outer edge corner of the sliding portion 352a1 on the first valve seat 104c2 side is chamfered and inclined over the entire circumference.
The front end portion 352a2 is formed at an end portion of the sliding portion 352a1 on the first region S11 side and is in contact with and away from the first valve seat 104c2. The front end portion 352a2 includes, for example, a cylindrical portion 352a21 projecting from an end portion of the sliding portion 352a1 on the first region S11 side, and a closing portion 352a22 closing the first valve hole 104c1 side end of the cylindrical portion 352a21. . The inner diameter of the cylindrical portion 352a21 matches the inner diameter of the sliding portion 352a1. The outer edge portion of the end surface of the closing portion 352a22 on the first valve hole 104c1 side protrudes in an annular shape. The first valve portion 352a opens and closes the first valve hole 104c1 by contacting and separating the annular projecting portion of the closing portion 352a22 of the front end portion 352a2 from the first valve seat 104c2.
The rear end portion 352a3 is formed in a cylindrical shape and extends from the second region S12 side of the sliding portion 352a1 toward the partition member 351 side. The outer diameter of the rear end portion 352a3 is set to be smaller than the outer diameter of the sliding portion 352a1 and larger than the outer diameter of the end surface portion of the annular projecting portion 351b2 of the partition member 351. The inner diameter of the rear end portion 352a3 is set to be larger than the inner diameter of the sliding portion 352a1 and the inner diameter of the cylindrical portion 352a21 of the front end portion 352a2, and smaller than the hole diameter of the insertion hole 351b1 of the partition member 351, and the shaft portion. It is set according to the outer diameter of the shaft portion 352c so that 352c can be press-fitted.
The second valve portion 352b is formed in a generally annular shape. The second valve part 352b has an outer diameter larger than the hole diameter of the insertion hole 351b1 of the partition member 351, and an inner diameter smaller than the hole diameter of the insertion hole 351b1 and the inner diameter of the rear end part 352a3. Further, as shown in FIGS. 3 and 7, the outer edge of the end surface of the second valve portion 352b on the second valve hole 151a side protrudes toward the second valve seat 151b and is larger than the inner diameter of the second valve hole 151a. An annular protrusion 352b1 having an inner diameter is formed. One end of the first internal passage 352e1 of the internal passage 352e is opened on the radially inner end face of the protruding portion 352b1. Further, the protrusion 352b1 is separated from the second valve seat 151b, whereby a gap (communication portion) G (see FIG. 3B) is formed between the second valve portion 352b and the second valve seat 151b. . Then, the second valve hole 151a and the pressure release hole 351a1 communicate with each other through the gap G (that is, the switching valve 350 is switched to the second state shown in FIG. 3B). On the other hand, when the second valve portion 352b contacts the second valve seat 151b, the gap G between the second valve portion 352b and the second valve seat 151b is closed, and the second valve hole 151a and the pressure release hole 351a1. (That is, the switching valve 350 is switched to the first state shown in FIG. 3A).
The shaft portion 352c is formed integrally with the second valve portion 352b and extends from the end of the second valve portion 352b on the first valve hole 104c1 side toward the first valve hole 104c1 side.
In the present embodiment, the shaft portion 352c is inserted into the insertion hole 351b1 of the partition member 351, and the end portion on the first valve portion 352a side is the end surface of the partition member 351 on the first valve chamber S1 side (specifically, the partition member). 351 is disposed so as to protrude from the protruding portion 351b2) to the first valve portion 352a side.
In the present embodiment, in the first state (the state shown in FIG. 3A), the end of the first valve portion 352a on the shaft portion 352c side abuts on the peripheral portion of the insertion hole 351b1 of the partition member 351. The position in the extending direction of the axis O2 of the first valve portion with respect to the shaft portion 352c is set so that the second valve portion 352b contacts the second valve seat 151b. Specifically, when the protruding portion 352b1 of the second valve portion 352b contacts the second valve seat 151b, the end surface of the rear end portion 352a3 of the first valve portion 352a on the shaft portion 352c side is simultaneously the protruding portion 351b2 of the partition member 351. The press-fitting position in the extending direction of the axis O2 of the first valve portion 352a with respect to the shaft portion 352c is adjusted so as to contact the shaft portion 352c.
Here, the components of the spool 352 can be formed of an appropriate material such as metal or resin, but it is desirable that the spool 352 be formed of a resin material in order to reduce the weight of the spool 352. In particular, an integral part (valve element) of the second valve portion 352b and the shaft portion 352c is disposed in the second valve chamber S2 and cooled by the suction refrigerant. Therefore, a relatively inexpensive general-purpose engineering plastic (for example, polyamide-based resin) can be used as a material for an integral part of the second valve portion 352b and the shaft portion 352c. The first valve portion 352a is also preferably formed of the same type of resin material as the integral part of the second valve portion 352b and the shaft portion 352c. In the present embodiment, the entire spool 352 is described as being made of a resin material.
"Internal passage"
In the present embodiment, as shown in FIG. 8, the first internal passage 352e1 of the internal passage 352e includes a first valve hole side passage L1, a shaft portion side passage L2, a first opening end side passage L3, and a second It is comprised by the opening end side channel | path L4.
The first valve hole side passage L1 is formed in a region on the first valve hole 104c1 side in a region in the first valve portion 352a and has a predetermined passage inner diameter. Specifically, the first valve hole side passage L1 is configured by a space in the cylindrical portion 352a21 of the front end portion 352a2 and a space in the sliding portion 352a1 that is continuous with the space in the cylindrical portion 352a21.
The shaft portion side passage L2 is formed in a valve body (the integral part) composed of the second valve portion 352b and the shaft portion 352c and has the same passage inner diameter as the passage inner diameter of the first valve hole side passage L1. Specifically, the shaft portion side passage L2 includes a space on the opening end side (first valve portion 352a side) of the shaft portion 352c in the space in the shaft portion 352c.
The first opening end side passage L3 is continuous with the first valve hole side passage L1 and is formed at the opening end portion on the shaft portion 352c side of the first valve portion 352a. The first opening end side passage L3 is larger than the passage inner diameter of the first valve hole side passage L1 and the passage inner diameter of the shaft portion side passage L2, and the passage inner diameter (that is, the shaft portion 352c) into which the shaft portion 352c can be press-fitted. The inner diameter of the passage is substantially the same as the outer diameter of Specifically, the first opening end side passage L3 includes a space in the rear end portion 352a3 of the first valve portion 352a, and the first valve hole side passage L1 in the sliding portion 352a1 and the shaft in the shaft portion 352c. The part side passage L2 is communicated.
The second opening end side passage L4 is formed in a tapered shape so as to be continuous with the shaft portion side passage L2 and to increase the passage inner diameter as approaching the opening end on the second valve portion 352b side. Specifically, the second opening end side passage L4 extends through the second valve portion 352b and into the shaft portion 352c.
"Pressure release passage and pressure supply passage"
As shown in FIG. 3B, when the second valve portion 352b is separated from the second valve seat 151b, the communication passage 101e, the communication hole of the cylinder gasket 152, the communication hole of the intake valve forming plate 150, and the valve plate 103 The communication hole, the second valve hole 151a, the gap G between the second valve portion 352b and the second valve seat 151b, the second valve chamber S2, and the pressure release hole 351a1 are the first communication between the crank chamber 140 and the suction chamber 141. A pressure relief passage 146a is configured. The refrigerant in the crank chamber 140 flows through the first pressure release passage 146a as shown by the thick arrow in FIG. 3B and is discharged to the suction chamber 141.
That is, by separating the second valve portion 352b from the second valve seat 151b, a gap G is formed between the second valve portion 352b and the second valve seat 151b, and the second valve hole 151a and the pressure release hole 351a1. And the opening of the first pressure release passage 146a becomes the maximum opening, and the refrigerant in the crank chamber 140 is discharged to the suction chamber 141.
In addition, after the second valve portion 352b is separated from the second valve seat 151b, the first valve portion 352a abuts on the first valve seat 104c2, the first valve hole 104c1 is closed, and the first valve hole 104c1 is included. The constructed pressure supply passage 145 will be closed.
On the other hand, as shown in FIG. 3A, when the second valve portion 352b comes into contact with the second valve seat 151b, the gap G between the second valve portion 352b and the second valve seat 151b, that is, the second valve hole. By closing the communication portion between 151a and the pressure release hole 351a1, the first pressure release passage 146a including the gap G is closed. Therefore, when the second valve portion 352b contacts the second valve seat 151b, the fixed throttle 103c of the second pressure release passage 146b becomes the minimum opening in the pressure release passage 146, and the refrigerant in the crank chamber 140 enters the suction chamber 141. Emission is restricted.
Here, when the second valve portion 352b comes into contact with the second valve seat 151b, the first valve portion 352a is separated from the first valve seat 104c2 and the first valve hole 104c1 is opened. Accordingly, the communication path 104e, the control valve 300, the accommodation hole 104b, the communication path 104f, the first valve hole 104c1, the first region S11 of the first valve chamber S1, the second internal path 352e2, the first internal path 352e1, the second The valve hole 151a, the communication hole of the valve plate 103, the communication hole of the suction valve forming plate 150, the communication hole of the cylinder gasket 152, and the communication path 101e constitute a pressure supply path 145 that allows the crank chamber 140 and the discharge chamber 142 to communicate with each other. . The refrigerant in the discharge chamber 142 flows through the pressure supply passage 145 and is supplied to the crank chamber 140 as shown by a thick arrow in FIG.
As described above, the second valve hole 151a, the communication hole of the valve plate 103, the communication hole of the suction valve forming plate 150, the communication hole of the cylinder gasket 152 and the communication path 101e (that is, the above-described “shared path”) are the first. The pressure release passage 146a and the pressure supply passage 145 also serve as the refrigerant flow direction in the communication passage 101e when the pressure is released from the crank chamber 140 and when the pressure is supplied to the crank chamber 140. In other words, the dual-purpose passage constitutes a part of the pressure supply passage 145 (first state shown in FIG. 3A) and a part of the first pressure release passage 146a (see FIG. 3). 3 (b), the second state).
When the second valve portion 352b abuts on the second valve seat 151b and the first valve portion 352a is separated from the first valve seat 104c2, the dual-purpose passage including the communication passage 101e functions as the pressure supply passage 145. On the other hand, when the second valve portion 352b is separated from the second valve seat 151b and the first valve portion 352a contacts the first valve seat 104c2, the dual-purpose passage including the communication passage 101e functions as the first pressure release passage 146a. To do.
"Aperture passage"
A region of the pressure supply passage 145 between the control valve 300 and the switching valve 350 communicates with the suction chamber 141 via the throttle passage 104h (see FIG. 1). The throttle passage 104h is provided to release the refrigerant in the pressure supply passage 145 between the control valve 300 and the switching valve 350 to the suction chamber 141 side when the control valve 300 is closed and the pressure supply passage 145 is closed. ing. Since the throttle passage 104h has a throttle, the amount of refrigerant flowing out from the pressure supply passage 145 to the suction chamber 141 through the throttle passage 104h is small. The passage sectional area of the internal passage 352e of the spool 352 and the passage sectional area of the communication passage 104f are set to be larger than the passage sectional area of the throttle passage 104h.
Here, when the control valve 300 is closed and the pressure supply passage 145 is closed in a state where the second valve portion 352b is in contact with the second valve seat 151b (first state shown in FIG. 3A). Thereafter, the refrigerant in the pressure supply passage 145 between the control valve 300 and the switching valve 350 flows into the suction chamber 141 through the throttle passage 104h, and the pressure supply passage 145 between the control valve 300 and the switching valve 350. The pressure of gradually decreases. Therefore, the refrigerant flows back through the internal passage 352e from the crank chamber 140 toward the suction chamber 141.
On the other hand, when the control valve 300 is opened and the pressure supply passage 145 is opened in a state where the first valve portion 352a is in contact with the first valve seat 104c2 (second state shown in FIG. 3B), Thereafter, the refrigerant from the discharge chamber 142 is supplied to the pressure supply passage 145 between the control valve 300 and the switching valve 350, and the pressure in the pressure supply passage 145 between the control valve 300 and the switching valve 350 increases. For this reason, the back pressure Pm acting on the end surface of the spool 352 on the first valve hole 104 c 1 side is higher than the pressure in the suction chamber 141.
"Spool behavior"
The end surface of the spool 352 on the first valve hole 104c1 side receives the pressure of the pressure supply passage 145 between the control valve 300 and the switching valve 350, so-called back pressure Pm. On the other hand, the end surface of the spool 352 on the second valve hole 151 a side receives the pressure Pc of the crank chamber 140. The spool 352 moves in the axial direction in response to a pressure difference ΔP (ΔP = Pm−Pc) between the back pressure Pm and the pressure Pc. The pressure receiving area s1 of the axial spool 352 that receives the back pressure Pm and the pressure receiving area s2 of the spool 352 that receives the pressure Pc of the crank chamber 140 are set to, for example, s1 = s2, but the operation of the spool 352 is performed. To adjust, s1> s2 or s1 <s2 can be set.
First, the switching operation from the second state to the first state will be described.
When the control valve 300 is opened while the first valve portion 352a is in contact with the first valve seat 104c2 (FIG. 3B, the second state), the back pressure Pm of the spool 352 increases. Thereafter, when the back pressure Pm becomes higher than the pressure Pc of the crank chamber 140 (in a state where Pm−Pc> 0), the first valve portion 352a starts to separate from the first valve seat 104c2. And when the 2nd valve part 352b contact | abuts to the 2nd valve seat 151b, the 1st valve part 352a will be in the state spaced apart to the maximum from the 1st valve seat 104c2 (2nd state-> 1st state). Thereby, the switching valve 350 is switched from the second state to the first state. As a result, the communication between the second valve hole 151a and the pressure release hole 351a1 is blocked, the communication path (first pressure release path 146a) between the crank chamber 140 and the suction chamber 141 is closed, and at the same time, the first valve hole 104c1 and the second valve hole 151a communicate with each other, and the communication path (pressure supply path 145) between the discharge chamber 142 and the crank chamber 140 is opened.
That is, when the control valve 300 is opened, the first valve hole 104c1 is opened, and the communication path 104e, the control valve 300, the accommodation hole 104b, the communication path 104f, the first valve hole 104c1, the first region S11, the second internal path. 352e2, the first internal passage 352e1, the second valve hole 151a, the communication hole of the valve plate 103, the communication hole of the suction valve forming plate 150, the communication hole of the cylinder gasket 152, and the pressure supply passage 145 configured through the communication path 101e. Thus, the refrigerant in the discharge chamber 142 is supplied to the crank chamber 140.
As a result, only the second pressure release passage 146b of the pressure release passage 146 is opened, and the minimum opening area of the pressure release passage 146 becomes the opening area of the fixed throttle 103c. For this reason, the pressure in the crank chamber 140 easily rises, the pressure in the crank chamber 140 rises according to the opening degree of the control valve 300, the inclination angle of the swash plate 111 decreases from the maximum, and the piston stroke is variable. Can be controlled.
Next, the switching operation from the first state to the second state will be described.
When the control valve 300 is closed while the second valve portion 352b is in contact with the second valve seat 151b (FIG. 3A, the first state), the back pressure Pm of the spool 352 gradually decreases. . Thereafter, when the back pressure Pm becomes lower than the pressure Pc in the crank chamber 140 (in a state where Pm−Pc <0), the refrigerant flows backward from the crank chamber 140 toward the suction chamber 141 through the internal passage 352e. When the spool 352 is pressed by the reverse refrigerant flow, the spool 352 moves to the first valve seat 104c2 side, and the second valve portion 352b starts to separate from the second valve seat 151b. And when the 1st valve part 352a contact | abuts to the 1st valve seat 104c2, the 2nd valve part 352b will be in the state spaced apart to the maximum from the 2nd valve seat 151b (1st state-> 2nd state). As a result, the switching valve 350 is switched from the first state to the second state. As a result, the second valve hole 151a communicates with the pressure release hole 351a1, and the opening degree of the communication path (first pressure release path 146a) between the crank chamber 140 and the suction chamber 141 becomes the maximum opening degree. The communication between the valve hole 104c1 and the second valve hole 151a is blocked, and the communication path (pressure supply path 145) between the discharge chamber 142 and the crank chamber 140 is closed.
That is, when the control valve 300 is closed, the second valve hole 151a and the pressure release hole 351a1 are communicated, the communication path 101e, the communication hole of the cylinder gasket 152, the communication hole of the suction valve forming plate 150, and the communication of the valve plate 103. The refrigerant in the crank chamber 140 enters the suction chamber 141 through the first pressure release passage 146a and the second pressure release passage 146b, each of which includes the hole, the second valve hole 151a, the second valve chamber S2, and the pressure release hole 351a1. It will be discharged.
As a result, the supply of refrigerant from the discharge chamber 142 to the crank chamber 140 is stopped, while the refrigerant in the crank chamber 140 passes through the second pressure release passage 146b (fixed throttle 103c) and the first pressure release passage 146a. Immediately discharged into the suction chamber 141. For this reason, the pressure in the crank chamber 140 is equivalent to the pressure in the suction chamber 141, the inclination angle of the swash plate is maximized, and the piston stroke (discharge capacity) is maximized.
"Operation of variable capacity compressor"
When the energization to the mold coil 314 of the control valve 300 is cut off while the variable capacity compressor 100 is in operation, the opening area of the control valve 300 is maximized, the pressure supply passage 145 is opened, and the spool of the switching valve 350 is opened. The back pressure Pm of 352 is increased. Therefore, when the first valve portion 352a is in contact with the first valve seat 104c2 (in the maximum discharge capacity state, in other words, in the second state), the spool 352 is brought into contact with the second valve seat 151b. Move in the direction of approach. The first valve portion 352a is separated from the first valve seat 104c2, and the second valve portion 352b abuts on the second valve seat 151b, thereby closing the first pressure release passage 146a.
That is, when the control valve 300 is opened, the pressure release passage 146 is only the second pressure release passage 146b (the opening area of the pressure release passage is minimized), while the pressure that communicates the discharge chamber 142 and the crank chamber 140. The supply passage 145 is opened. As a result, the pressure in the crank chamber 140 increases, the inclination angle of the swash plate 111 decreases, and the discharge capacity is changed to the minimum and maintained (minimum discharge capacity state). Then, the dynamic pressure of the refrigerant flow flowing through the pressure supply passage 145 acts on the end surface of the first valve portion 352a on the first valve seat 104c2 side, so that the second valve portion 352b contacts the second valve seat 151b. In this state (minimum discharge capacity state, in other words, the first state), the dynamic pressure that presses the first pressure release passage 146a in the opening direction does not act on the second valve portion 352b, and the first release pressure The closed state (minimum discharge capacity state, the first state) of the pressure passage 146a is maintained.
In the minimum discharge capacity state, the discharge check valve 200 blocks the connection portion (discharge path) between the communication path 144 and the muffler space 143, and the refrigerant gas discharged with the minimum discharge capacity flows to the external refrigerant circuit. Instead, it circulates through an internal circulation path constituted by the discharge chamber 142, the pressure supply passage 145, the crank chamber 140, the second pressure release passage 146b, the suction chamber 141, and the cylinder bore 101a. At this time, the refrigerant in the pressure supply passage 145 between the control valve 300 and the switching valve 350 slightly flows out to the suction chamber 141 through the throttle passage 104h.
When energizing the mold coil 314 of the control valve 300 from this state (minimum discharge capacity state), the control valve 300 is closed and the pressure supply passage 145 is closed. Therefore, the refrigerant in the pressure supply passage 145 between the control valve 300 and the switching valve 350 flows out into the suction chamber 141 via the throttle passage 104h, and flows through the pressure supply passage 145 between the control valve 300 and the switching valve 350. The pressure (back pressure Pm) decreases. In response to the decrease in the back pressure Pm, the spool 352 moves in a direction away from the second valve seat 151b, so that the first valve portion 352a contacts the first valve seat 104c2. As a result, the pressure supply passage 145 is closed, and the refrigerant is prevented from flowing backward from the crank chamber 140 to the pressure supply passage 145 upstream of the switching valve 350 via the communication passage 101e. At the same time, the second valve portion 352b is separated from the second valve seat 151b, whereby the first pressure release passage 146a is opened.
When the mold coil 314 is energized and the control valve 300 is closed, the opening of the first pressure release passage 146a becomes the maximum opening, and the refrigerant in the crank chamber 140 flows through the two

pressure release passages

146a and 146b. It is discharged into the suction chamber 141. The flow passage cross-sectional area of the first pressure relief passage 146a in the switching valve 350 is set to be larger than the flow passage cross-sectional area of the fixed throttle 103c (second pressure relief passage 146b). When the opening degree of the passage 146a is controlled to the maximum opening degree, the refrigerant in the crank chamber 140 quickly flows out to the suction chamber 141. As a result, the pressure in the crank chamber 140 decreases, and the discharge capacity increases rapidly from the minimum state to the maximum discharge capacity.
As a result, the pressure in the discharge chamber 142 is rapidly increased and the discharge check valve 200 is opened, and the refrigerant gas is discharged from the variable capacity compressor 100 so that the refrigerant circulates through the external refrigerant circuit. Becomes operational.
When the air conditioner system is activated and the pressure in the suction chamber 141 decreases and reaches a set pressure set by the current flowing through the mold coil 314, the control valve 300 is opened. When the control valve 300 is opened, the back pressure Pm of the spool 352 of the switching valve 350 is increased, so that the switching valve 350 opens the pressure supply passage 145 and simultaneously closes the first pressure release passage 146a. At this time, by opening only the second pressure release passage 146b of the pressure release passage 146, the refrigerant in the crank chamber 140 is restricted from flowing out to the suction chamber 141, and the pressure in the crank chamber 140 is easily increased. Thus, the opening of the control valve 300 is adjusted and the discharge capacity is variably controlled so that the pressure in the suction chamber 141 maintains the set pressure. That is, the switching valve 350 operates in conjunction with the opening and closing of the control valve 300. When the control valve 300 is closed, the opening of the pressure release passage 146 is set to the maximum opening, and the control valve 300 is opened. If so, the opening of the pressure relief passage 146 is set to the minimum opening.
Next, the assembly procedure of the spool 352 will be described with reference to FIGS. 3 and 8 to 10. FIG. 9 is a conceptual diagram for explaining an assembly procedure of the spool 352, and FIG. 10 is an enlarged cross-sectional view of a joining portion of the first valve portion 352a and the shaft portion 352c of the switching valve 350.
In the present embodiment, the spool 352 is assembled with the partition member 351 as shown in FIG. 8, and is incorporated into the accommodating chamber 104c formed on the open end face side of the cylinder head 104 as shown in FIG. It is.
For the assembly of the spool 352, in detail, a jig W including a positioning base W1 and positioning pins W2 shown in FIG. 9A is used. The positioning base W1 is made of, for example, a cubic metal block, and has a recess W1a having a circular cross section at one end. The recess W1a has an inner diameter that matches the outer diameter of the cylindrical body 351a of the partition member 351. A pin press-fitting hole W1c for press-fitting the pin W2 is formed in the bottom wall W1b of the recess W1a. The hole center of the pin press-fit hole W1c is set so as to pass through the radial axis of the recess W1a.
First, as shown in FIG. 9A, the pin W2 is press-fitted into the pin press-fitting hole W1c. The pin W2 is arranged so that one end thereof protrudes upward from one end of the positioning base W1. Then, while inserting the pin W2 through the first internal passage 352e1 of the valve body composed of the second valve portion 352b and the shaft portion 352c, the protruding portion 352b1 of the second valve portion 352b of the valve body is connected to the bottom wall of the concave portion W1a. The valve body is placed on the positioning base W1 while being in contact with W1b. As a result, the radial position of the valve body relative to the positioning base W1 and the position of the axis O2 in the extending direction are determined. In this state, the valve body is stably positioned by the pin W2 on the shaft portion 352c side away from the end surface of the protruding portion 352b1 of the second valve portion 352b. The length of the pin W2 is set so that one end of the pin W2 protrudes from the end of the shaft portion 352c in a state where the valve body is positioned.
Specifically, when the pin W2 is inserted through the first internal passage 352e1, the tip of the pin W2 is guided by the second opening end side passage L4 formed in a taper shape, and the valve body is its annular projecting portion. The 352b1 moves smoothly to a position where it abuts against the bottom wall W1b of the recess W1a. In this state, the valve body is stably positioned by guiding the entire inner peripheral surface of the shaft side passage L2 to the outer peripheral surface of the pin W2.
Next, as shown in FIG. 9B, the cylinder 351a of the partition member 351 is disposed in the recess W1a while the pin W2 and the shaft portion 352c are inserted through the insertion hole 351b1 of the partition member 351. The partition member 351 is disposed such that the outer peripheral surface of the cylindrical body 351a is guided by the inner peripheral surface of the concave portion W1a, and the end portion (the other end 351a2) of the cylindrical body 351a is in contact with the bottom wall W1b of the concave portion W1a. . In this state, both the end of the cylindrical body 351a of the partition member 351 and the protruding portion 352b1 of the second valve portion 352b are in contact with the bottom wall W1b of the recess W1a. And the edge part by the side of the 1st valve part 352a of the axial part 352c and the pin W2 is arrange | positioned so that it may protrude from the protrusion part 351b2 of the division member 351 to the 1st valve part 352a side.
Next, as shown in FIG. 9 (c), the pin W2 is inserted into the first valve hole side passage L1 in the sliding portion 352a1 and the first opening end side passage L3 in the rear end portion 352a3. The end portion of the shaft portion 352c is fitted into the first opening end side passage L3 of the rear end portion 352a3 while being inserted. Specifically, the first valve portion 352a is guided by the inner peripheral surface of the first valve hole side passage L1 in the sliding portion 352a1 being in contact with the outer peripheral surface of the distal end portion of the pin W2, thereby guiding the rear end portion 352a3. The opening portion of the first opening end side passage L3 is guided to the tip portion of the shaft portion 352c.
Next, as shown in FIG. 9D, the first valve portion 352a is pressed downward from the front end portion 352a2 side, and the rear end portion 352a3 of the first valve portion 352a is press-fitted into the front end portion of the shaft portion 352c. . In this state, the end surface on the shaft portion 352c side of the rear end portion 352a3 of the first valve portion 352a abuts on the protruding portion 351b2 of the partition member 351, and the protruding portion 352b1 of the second valve portion 352b is the second valve seat 151b. Abut.
In this state, the rear end portion 352a3 of the first valve portion 352a and the shaft portion 352c are joined by, for example, ultrasonic welding or laser welding. Specifically, as shown in FIG. 10, the joint portion J between the rear end portion 352a3 and the shaft portion 352c is axially directed from the contact portion C between the protruding portion 351b2 of the partition member 351 and the end surface of the rear end portion 352a3. It is good to set it at a position far away. In this manner, an assembly of the spool 352 and the partition member 351 is completed. Thereafter, the assembly is press-fitted into the storage chamber 104c as shown in FIG. More specifically, the cylindrical body 351a of the partition member 351 in the assembly is press-fitted into the large-diameter portion 104c3 of the storage chamber 104c, whereby the assembly is fixed in the storage chamber 104c.
In the variable capacity compressor 100 according to the present embodiment, the first internal passage 352e1 of the internal passage 352e that penetrates the spool 352 in the switching valve 350 is formed from the end surface of the second valve portion 352b on the second valve hole 151a side to the second valve portion. Extending along the axis O2 connecting the hole center of the first valve hole 104c1 and the hole center of the second valve hole 151a to the region in the first valve part 352a via the inside of 352b and the shaft part 352c, The second valve portion 352b is formed integrally with the shaft portion 352c. That is, the integral part of the second valve portion 352b and the shaft portion 352c has a relatively long through hole that forms a part of the first internal passage 352e1 and extends along the axis 352c.
Therefore, a simple jig W composed of the positioning base W1 and the pin W2 is prepared during press-fitting work in the assembly of the spool 352, and the through hole constituting a part of the first internal passage 352e1 in the integrated part. By inserting the pin W2 into the shaft portion side passage L2 and the second opening end side passage L4, the second valve portion 352b can be stably positioned with respect to the jig W together with the shaft portion 352c. Since the first internal passage 352e1 extends to a region in the first valve portion 352a, for example, in a state where the integrated part is positioned, the pin W2 protrudes from the end portion of the shaft portion 352c. If the length is set, when the first valve portion 352a is press-fitted into the shaft portion 352c of the integral part, the pin W2 is inserted into the first internal passage 352e1 (first valve hole side passage L1) on the first valve portion 352a side. It is possible to guide the movement of the first valve portion 352a. In this way, by inserting the pin W2 through the first internal passage 352e1, it is possible to guide the positioning of the integral parts of the second valve portion 352b and the shaft portion 352c and the movement of the first valve portion 352a during press-fitting. Therefore, the spool 352 can be easily assembled with the simple jig W while maintaining the assembly accuracy of the spool 352 of the switching valve 350.
In the present embodiment, the partition member 351 has an insertion hole 351b1 through which the shaft portion 352c can be inserted. The shaft portion 352c is inserted into the insertion hole 351b1, and the end on the first valve portion 352a side is the partition member 351. It arrange | positions so that it may protrude from the end surface by the side of 1st valve chamber S1 to the 1st valve part 352a side. Accordingly, the first valve portion 352a can be easily joined to the shaft portion 352c formed integrally with the second valve portion 352b in a state where the second valve portion 352b is disposed in the partition member 351. .
In the present embodiment, the first internal passage 352e1 includes a first valve hole side passage L1 and a shaft portion side passage L2, and the passage inner diameter of the first valve hole side passage L1 and the passage inner diameter of the shaft portion side passage L2 are the same. It was supposed to be. Thereby, the pin W2 of a single outer diameter can be used, and the structure of the jig | tool W can be simplified.
In the present embodiment, the shaft portion 352c is formed in a cylindrical shape, the first internal passage 352e1 further includes a first opening end side passage L3, and the first opening end side passage L3 is continuous with the first valve hole side passage L1. In addition, it is formed at the opening end of the first valve portion 352a on the shaft portion 352c side, is larger than the passage inner diameter of the first valve hole side passage L1 and the passage inner diameter of the shaft portion side passage L2, and can press-fit the shaft portion 352c. It has a passage inner diameter. As a result, as shown in FIG. 9C, the radial position of the first valve portion 352a is determined by the distal end portion of the pin W2 protruding from the distal end of the shaft portion 352c, and the rear end of the first valve portion 352a. The opening portion of the first opening end side passage L3 of the portion 352a3 can be easily guided to the tip portion of the shaft portion 352c.
In the present embodiment, the first internal passage 352e1 further includes a tapered second opening end side passage L4. Thereby, the pin W2 can be smoothly inserted into the first internal passage 352e1.
In the present embodiment, the entire spool 352 is made of a resin material. Accordingly, an integrated part of the second valve part 352b and the shaft part 352c can be easily formed, and the integrated part and the first valve body 352a can be easily joined by ultrasonic welding or laser welding. Can do.
In the present embodiment, the welding joint portion between the first valve portion 352a and the shaft portion 352c is set at a position away from the end portion on the shaft portion 352c side of the first valve portion 352a toward the first valve hole 104c1 side. ing. Thereby, the thermal influence on the contact part C at the time of welding with the rear-end part 352a3 and the axial part 352c can be reduced or eliminated effectively.
"Modification"
In the present embodiment, the first valve portion 352a includes the rear end portion 352a3 extending from the second region S12 side of the sliding portion 352a1 toward the partition member 351 side. As shown in FIG. 11, you may comprise by the sliding part 352a1 and the front-end part 352a2. In this case, the center-of-gravity position G in the extending direction of the axis O2 of the spool 352 may be set in the region of the sliding portion 352a1. As a result, the center of gravity position G of the spool 352 can be provided at the portion guided by the inner peripheral surface of the first valve chamber S1 (that is, the sliding portion 352a1), and therefore the inclination of the spool 352 relative to the axis O2 is suppressed, The posture of the spool 352 can be stabilized. As a result, the spool 352 can be moved more smoothly. In the case of this modification, as shown in FIG. 11, the first opening end side passage L3 having a passage inner diameter into which the shaft portion 352c can be press-fitted is connected to the opening end portion on the shaft portion 352c side of the first valve portion 352a (that is, The opening portion on the shaft portion 352c side of the sliding portion 352a may be formed. By setting the sliding portion 352a1 as a joint portion with the shaft portion 352c, the weight of the sliding portion 352a1 can be increased, and as a result, the center of gravity position G can be easily set to the sliding portion 352a1. . Also, by making the specific gravity of the first valve portion 352a different from the specific gravity of the valve body composed of the second valve portion 352b and the shaft portion 352c, the center of gravity position G can be easily set in the region of the sliding portion 352a1. it can. Therefore, by appropriately adjusting the specific gravity of the first valve portion 352a and the specific gravity of the valve body including the second valve portion 352b and the shaft portion 352c, the spool 352 shown in FIG. 3 provided with the rear end portion 352a3 Even if it exists, the gravity center position G can be set to the area | region of the rocking | swiveling part 352a1. The resin material of the spool 352 may be mixed with glass fiber. By adjusting the blending ratio of the glass fibers in the resin material of the first valve part 352a and the blending ratio of the glass fibers in the resin material of the valve body composed of the second valve part 352b and the shaft part 352c, the center of gravity position G Can be adjusted easily.
In the present embodiment, the shaft portion side passage L2 has the same passage inner diameter as the passage inner diameter of the first valve hole side passage L1, but not limited to this, the passage inner diameter of the first valve hole side passage L1 It may have a large passage inner diameter. In this case, the pin W2 may be formed so that the tip end side of the pin W2 has a small diameter. Further, the second opening end side passage L4 is not limited to the tapered shape, and may be formed linearly with the same outer diameter as the shaft portion side passage L2.
In the present embodiment, the entire spool 352 is made of a resin material. However, the present invention is not limited to this, and the second valve portion 352b and the shaft portion 352c of the spool 352 are made of a resin material, and the first valve portion 352a It may be made of a metal material, or the entire spool 352 may be made of a metal material.
In this embodiment, the switching valve 350 is disposed in the cylinder head 104. However, the switching valve 350 is disposed in another housing component, for example, a cylinder block, or the switching valve 350 is accommodated in a dedicated valve housing. Or can be disposed in the compressor housing. Further, the control valve 300 can be a mechanical control valve that does not include a solenoid.
In the present embodiment, the variable capacity compressor 100 is a swash plate type clutchless variable capacity compressor. However, the present invention is not limited thereto, and a variable capacity compressor equipped with an electromagnetic clutch, a variable capacity compressor driven by a motor, can do.
Although the contents of the present invention have been specifically described with reference to the preferred embodiments, it is obvious that those skilled in the art can take various modifications based on the basic technical idea and teachings of the present invention. It is.

101a ... cylinder bore (compression part), 104c1 ... first valve hole, 104h ... throttle passage, 136 ... piston (compression part), 141 ... suction chamber, 140 ... crank chamber (control pressure chamber), 142 ... discharge chamber, 145 ... Pressure supply passage, 151a ... second valve hole, 300 ... control valve, 350 ... switching valve, 351 ... partition member, 351a1 ... pressure release hole, 351b1 ... insertion hole, 352 ... spool, 352a ... first valve part, 352a1 ... Sliding part, 352b ... second valve part, 352c ... shaft part, 352e ... internal passage, 352e1 ... first internal passage, 352e2 ... second internal passage, 100 ... variable displacement compressor, L1 ... first valve hole side passage , L2 ... shaft side passage, L3 ... first opening end side passage, L4 ... second opening end side passage, O2 ... axis, G ... center of gravity, S1 ... first valve chamber, S12 ... second region, S2 ... Second valve chamber

Claims

A suction chamber into which the refrigerant is guided; a compression unit that sucks and compresses the refrigerant in the suction chamber; a discharge chamber into which the refrigerant compressed by the compression unit is discharged; and a control pressure chamber; A variable capacity compressor whose discharge capacity changes according to pressure,
A control valve that is provided in a pressure supply passage for supplying the refrigerant in the discharge chamber to the control pressure chamber, and controls the opening of the pressure supply passage;
A switching valve provided closer to the control pressure chamber than the control valve in the pressure supply passage, the first valve hole communicating with the pressure supply passage between the control valve and the switching valve; and the switching valve; A first state where the second valve hole communicating with the pressure supply passage between the control pressure chambers communicates, and a second state where the second valve hole communicates with the pressure relief hole communicating with the suction chamber. A switching valve that switches to
A throttle passage communicating the pressure supply passage between the control valve and the switching valve and the suction chamber;
Including
The switching valve is
A partition member that partitions the first valve chamber having the first valve hole and the second valve chamber having the second valve hole and the pressure release hole;
A first valve portion disposed in the first valve chamber for opening and closing the first valve hole; a second valve portion disposed in the second valve chamber for opening and closing the second valve hole; and the first valve portion; A spool comprising a shaft portion that connects the second valve portion, and has a circular cross section and extends along an axis connecting the hole center of the first valve hole and the hole center of the second valve hole. A spool penetrating the partition member;
An internal passage for communicating the first valve hole and the second valve hole, the internal passage penetrating the spool;
Including
When the pressure in the pressure supply passage between the control valve and the switching valve is higher than the pressure in the control pressure chamber, the spool has the first valve hole and the second valve hole through the internal passage. And the communication between the second valve hole and the pressure release hole is blocked, and the pressure in the pressure supply passage between the control valve and the switching valve is lower than the pressure in the control pressure chamber, The communication between the first valve hole and the second valve hole is cut off and the second valve hole and the pressure release hole are communicated,
The internal passage extends along the axis from the end face of the second valve portion on the second valve hole side to the region in the first valve portion through the second valve portion and the shaft portion. A second passage that passes through the peripheral wall of the first valve portion and communicates with the region in the first valve portion, the formation wall of the first valve chamber, and the outer peripheral surface of the first valve portion. Consisting of an internal passage,
The second valve portion is formed integrally with the shaft portion,
Variable capacity compressor.
The shaft portion is formed in a cylindrical shape,
The first internal passage is
A first valve hole side passage formed in a region on the first valve hole side in a region in the first valve portion and having a predetermined passage inner diameter;
A passage inner diameter formed in a valve body composed of the second valve portion and the shaft portion and having the same passage inner diameter as the passage inner diameter of the first valve hole side passage or larger than the passage inner diameter of the first valve hole side passage. A shaft side passage having,
A first opening end side passage which is continuous with the first valve hole side passage and is formed at an opening end portion on the shaft portion side of the first valve portion, and the passage inner diameter of the first valve hole side passage. And a first opening end-side passage having a passage inner diameter that is larger than the passage inner diameter of the shaft-side passage and capable of press-fitting the shaft portion.
The first valve part includes a sliding part having an outer peripheral surface slidably in contact with an inner peripheral surface of the first valve chamber and having the first opening end side passage,
The variable capacity compressor according to claim 2, wherein the center of gravity of the spool in the extending direction of the axis is set in a region of the sliding portion.
The variable capacity compressor according to claim 3, wherein the sliding portion is formed at an opening end portion on the shaft portion side of the first valve portion.
The first internal passage further includes a second opening end side passage that is continuous with the shaft portion side passage and is formed such that the inner diameter of the passage becomes larger toward the opening end on the second valve portion side. Item 5. The variable capacity compressor according to any one of Items 2 to 4.
The partition member has an insertion hole through which the shaft portion can be inserted,
The shaft portion is inserted into the insertion hole of the partition member, and an end portion on the first valve portion side of the partition member projects from the end surface on the first valve chamber side of the partition member to the first valve portion side. The variable capacity compressor according to any one of claims 1 to 5, wherein
In the first state, the shaft portion side end of the first valve portion abuts on a peripheral edge portion of the through hole of the partition member, and the second valve portion is formed around the second valve hole. A position in the extending direction of the axis of the first valve portion relative to the shaft portion is set so as to contact the valve seat,
The spool is made of a resin material,
The welding joint portion between the first valve portion and the shaft portion is set at a position away from an end portion on the shaft portion side of the first valve portion toward the first valve hole side. 6. The variable capacity compressor according to 6.