CN110770440A

CN110770440A - Control valve for variable displacement compressor

Info

Publication number: CN110770440A
Application number: CN201880040401.6A
Authority: CN
Inventors: 田口幸彦
Original assignee: Sandian Auto Parts Co
Current assignee: Sanden Corp
Priority date: 2017-06-19
Filing date: 2018-05-15
Publication date: 2020-02-07
Anticipated expiration: 2038-05-15
Also published as: JP6871810B2; CN110770440B; JP2019002383A; WO2018235482A1

Abstract

A control valve for a variable displacement compressor, which suppresses the intrusion of foreign matter into a sliding support portion that slidably supports a valve unit including a valve portion that opens and closes a valve hole. A valve body (311) of a control valve configured to control the supply amount of a refrigerant in a discharge chamber to a pressure control chamber is provided with: a first port (320) into which the refrigerant in the discharge chamber flows; a second port (321) through which the refrigerant in the discharge chamber that has flowed in from the first port (320) flows out; a connection path connecting the inlet port (320) and the outlet port (321) via the valve chamber (315) and a valve hole (316) opening to the valve chamber (315); and a support hole (317) communicating with the valve hole (316). The support hole (317) slidably supports a valve unit (350) including a valve portion (351) for opening and closing the valve hole (316). The first port (320) extends to the valve hole (316), and is inclined so as to be closer to the opening of the valve chamber (315) side of the valve hole (316) as going from the outer peripheral surface side of the valve body (311) toward the center line (X) side.

Description

Control valve for variable displacement compressor

Technical Field

The present invention relates to a control valve for a variable capacity compressor.

Background

As an example of such a control valve, a solenoid valve described in patent document 1 is known. The solenoid valve 1 described in patent document 1 includes: a valve body 4, the valve body 4 having a valve chamber 3a for accommodating a valve body 3 b; a solenoid portion 2, the solenoid portion 2 being disposed on one side of the valve main body 4 and applying an urging force in a valve closing direction to the valve body 3b via a solenoid-side rod 5 c; and a bellows assembly 10, the bellows assembly 10 being disposed on the other side of the valve body 4, and applying a biasing force in a valve opening direction to the valve body 3b via the bellows side rod 5 e. In the valve chamber 3a, a valve seat (valve hole) 3c opened and closed by the valve body 3b is opened, and the valve seat (valve hole) 3c communicates with a discharge pressure region in which the discharge pressure Pd acts via a port 3f formed in the valve body 4. The valve chamber 3a communicates with a crank chamber pressure region in which the crank chamber pressure Pc acts via a port 3e formed in the valve main body 4. That is, when the valve seat (valve hole) 3c is opened by the valve body 3b, the refrigerant in the discharge chamber flows into the solenoid valve 1 via the port 3f, flows through the valve seat (valve hole) 3c and the valve chamber 3a, and then flows out of the solenoid valve 1 via the port 3 e.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open No. 2001-82624

Disclosure of Invention

Technical problem to be solved by the invention

In the solenoid valve 1, the bellows-side rod 5e is slidably supported by an inner cylindrical portion extending from the valve seat (valve hole) 3c to a pressure-sensitive chamber in which a suction pressure Ps lower than the discharge pressure Pd acts. The port 3f is connected to the inner cylindrical portion at a substantially right angle at a portion between the slide support portion of the bellows-side rod 5e of the inner cylindrical portion and the valve seat (valve hole) 3 c. Therefore, a part of the refrigerant in the discharge chamber flowing in from the port 3f flows toward the slide support portion, and foreign matter contained therein may enter a gap between the outer peripheral surface of the bellows-side rod 5e and the inner peripheral surface of the inner cylindrical portion. When the foreign matter enters the gap, the bellows-side rod 5e (or even the valve element 3b) is prevented from operating.

Accordingly, an object of the present invention is to prevent foreign matter from entering a sliding support portion that slidably supports a valve unit including a valve portion that opens and closes a valve hole in a control valve for a variable displacement compressor, thereby ensuring stable operation of the valve unit.

Technical scheme for solving technical problem

According to one aspect of the present invention, there is provided a control valve for a variable displacement compressor including a suction chamber into which a refrigerant before compression is introduced, a compression portion that compresses the refrigerant in the suction chamber, a discharge chamber from which the compressed refrigerant compressed by the compression portion is discharged, and a pressure control chamber that changes a discharge capacity by changing a state of the compression portion in accordance with an internal pressure, the control valve being configured to control a supply amount of the refrigerant in the discharge chamber to the pressure control chamber, the control valve comprising: a valve body having an inlet port that is opened at a first portion of an outer peripheral surface, is formed to face a center line side, and is configured to allow inflow of refrigerant in the discharge chamber, an outlet port that is opened at a second portion that is separated from the first portion of the outer peripheral surface in the center line direction, is formed to face the center line side, and is configured to allow outflow of refrigerant in the discharge chamber that has flowed in from the inlet port, and a connection path that connects the inlet port and the outlet port via a valve chamber and a valve hole that opens to the valve chamber; a valve portion provided in the valve chamber and opening and closing the valve hole; a solenoid portion that is provided on one side of the valve main body in the center line direction and applies an urging force in a valve closing direction to the valve portion via a solenoid rod; and a pressure-sensitive device that is disposed in a pressure-sensitive chamber provided on the other side of the valve main body in the center line direction and that operates in response to a pressure in the suction chamber, the solenoid rod, the valve portion and the pressure-sensitive rod are integrally connected to form a valve unit by applying a biasing force in a valve opening direction to the valve portion via the pressure-sensitive rod, and the valve unit is slidably supported by a support hole extending in the center line direction and provided in the valve body so as to communicate with the valve hole, in the control valve, at least one of the inlet port and the connection path on the inlet port side of the valve hole has an inclined portion, the inclined portion is inclined so as to approach the valve chamber side opening of the valve hole from the outer peripheral surface side toward the center line side.

Effects of the invention

In the control valve, at least one of the inlet port through which the refrigerant in the discharge chamber flows and the connection path on the inlet port side of the valve hole has an inclined portion that is inclined so as to approach the valve chamber side opening of the valve hole as going from the outer peripheral surface side of the valve body to the center line side. Therefore, the refrigerant flowing into the discharge chamber in the control valve from the inlet port is directed toward the opening of the valve chamber side of the valve hole by the inclined portion, and the refrigerant in the discharge chamber is prevented from flowing toward the support hole side. Therefore, even when the refrigerant in the discharge chamber contains foreign matter, the foreign matter is prevented from entering the support hole, and stable operation of the valve unit is ensured.

Drawings

Fig. 1 is a sectional view showing a schematic structure of a variable displacement compressor to which the present invention is applied.

Fig. 2 is a sectional view showing the structure of the first embodiment of the control valve for the variable displacement compressor.

Fig. 3 is an enlarged view of a main portion of fig. 2.

Fig. 4 is a sectional view showing a structure of a second embodiment of the control valve.

Fig. 5 is an enlarged view of a main portion of fig. 4.

Fig. 6 is an enlarged view of a main portion showing a modification of the second embodiment.

Detailed Description

Embodiments of the present invention will be described below with reference to the drawings. Fig. 1 is a cross-sectional view showing a schematic structure of a swash plate type variable displacement compressor to which the present invention is applied. The variable displacement compressor is configured as a clutchless compressor that is mainly applied to a vehicle air conditioning system.

The variable-capacity compressor 100 includes: a cylinder block 101, the cylinder block 101 having a plurality of cylinder bores 101 a; a front housing 102, the front housing 102 being provided at one end side of the cylinder 101; and a cylinder head 104, the cylinder head 104 being provided on the other end side of the cylinder block 101 with the valve plate 103 interposed therebetween. Further, the cylinder block 101, the front shell 102, the valve plate 103, and the cylinder head 104 are fastened by a plurality of through bolts 105 to constitute a compressor housing.

Further, a crank chamber 140 is formed by the cylinder block 101 and the front shell 102, and the drive shaft 110 is disposed to cross the inside of the crank chamber 140. The drive shaft 110 is rotatably supported by the compressor housing. Although not shown in the drawings, a center gasket is disposed between the front case 102 and the cylinder block 101, and a cylinder gasket, an intake valve forming plate, a discharge valve forming plate, and a head gasket are disposed between the cylinder block 101 and the cylinder head 104 in addition to the valve plate 103.

A swash plate 111 is disposed around an axial intermediate portion of the drive shaft 110. The swash plate 111 is coupled to a rotor 112 fixed to the drive shaft 110 via a link mechanism 120, and rotates together with the drive shaft 110. The swash plate 111 is configured to be capable of changing an angle (hereinafter referred to as "inclination angle") with respect to a plane orthogonal to the axis O of the drive shaft 110.

The link mechanism 120 includes: a first arm 112a, the first arm 112a protruding from the rotor 112; a second arm 111a, the second arm 111a protruding from the swash plate 111; and a link arm 121, one end side of which is coupled to the first arm 112a via a first coupling pin 122 so as to be rotatable, and the other end side of which is coupled to the second arm 111a via a second coupling pin 123 so as to be rotatable.

The through hole 111b of the swash plate 111 through which the drive shaft 110 is inserted is formed in a shape that allows the swash plate 111 to be tilted in a range from a maximum inclination angle to a minimum inclination angle. A minimum inclination angle restricting portion that abuts against the drive shaft 110 is formed in the through hole 111 b. When the inclination angle (minimum inclination angle) of the swash plate 111 when the swash plate 111 is orthogonal to the axis O of the drive shaft 110 is set to 0 °, the minimum inclination angle regulating portion of the through hole 111b is formed by: when the inclination angle of the swash plate 111 is substantially 0 °, the swash plate 111 abuts on the drive shaft 110 and further inclination motion of the swash plate 111 is restricted. Further, the swash plate 111 abuts the rotor 112 when the inclination angle thereof is the maximum inclination angle to restrict further tilting movement.

A tilt angle decreasing spring 114 and a tilt angle increasing spring 115 are attached to the drive shaft 110, the tilt angle decreasing spring 114 biasing the swash plate 111 in a direction to decrease the tilt angle of the swash plate 111, and the tilt angle increasing spring 115 biasing the swash plate 111 in a direction to increase the tilt angle of the swash plate 111. The inclination angle decreasing spring 114 is disposed between the swash plate 111 and the rotor 112, and the inclination angle increasing spring 115 is interposed between the swash plate 111 and a spring support member 116 fixed to the drive shaft 110.

Here, when the inclination angle of the swash plate 111 is the above-described minimum inclination angle, the biasing force of the inclination angle increasing spring 115 is set to be larger than the biasing force of the inclination angle decreasing spring 114, and when the drive shaft 110 is not rotated, the swash plate 111 is positioned at an inclination angle at which the biasing force of the inclination angle decreasing spring 114 and the biasing force of the inclination angle increasing spring 115 are balanced.

One end (left end in fig. 1) of the drive shaft 110 penetrates inside the boss portion 102a of the front housing 102 and extends to the outside of the front housing 102. A power transmission device, not shown, is coupled to the one end of the drive shaft 110. A shaft seal device 130 is provided between the drive shaft 110 and the boss portion 102a, and the inside and outside of the crank chamber 140 are blocked by the shaft seal device 130.

The coupling body of the drive shaft 110 and the rotor 112 is supported by bearings 131 and 132 in the radial direction, and is supported by a bearing 133 and a thrust plate 134 in the thrust direction. The drive shaft 110 (and the rotor 112) is configured to rotate in synchronization with the rotation of the power transmission device by transmitting power from an external drive source to the power transmission device. Further, the gap between the other end of drive shaft 110, i.e., the end on the thrust plate 134 side and thrust plate 134 is adjusted to a predetermined gap by adjusting screw 135.

A piston 136 is disposed in each cylinder bore 101 a. The swash plate 111 is interlocked with the piston 136 by accommodating the outer peripheral portion of the swash plate 111 and its vicinity via a pair of shoes 137 in a space inside a protruding portion of the piston 136 protruding into the crank chamber 140. Further, the pistons 136 reciprocate within the cylinder bores 101a by rotation of the swash plate 111 with rotation of the drive shaft 110. Further, the stroke amount of the piston 136 varies according to the inclination of the swash plate 111.

A suction chamber 141 is formed substantially at the center of the cylinder head 104, and a discharge chamber 142 is formed, and the discharge chamber 142 annularly surrounds the suction chamber 141. The suction chamber 141 communicates with the cylinder bore 101a via a communication hole 103a provided in the valve plate 103 and a suction valve (not shown) formed in the suction valve forming plate (not shown). The discharge chamber 142 communicates with the cylinder bore 101a via a discharge valve (not shown) formed in the discharge valve forming plate (not shown) and a communication hole 103b provided in the valve plate 103.

The suction chamber 141 is connected to a low-pressure side of a refrigerant circuit of the air conditioning system, which is not shown, via a suction passage 104 a.

A muffler 160 is provided at an upper portion of the cylinder 101 to reduce noise and vibration caused by pressure pulsation of the refrigerant. The muffler 160 is formed of a muffler forming wall 101b formed in a partitioned manner in an upper portion of the cylinder 101, and a cover member 106 fastened to the muffler forming wall 101b via a sealing member, not shown. A check valve 200 is disposed in a muffler space 143 inside the muffler 160.

The check valve 200 is disposed at an end of the communication path 144 on the muffler space 143 side, which communicates the discharge chamber 142 with the muffler space 143. Check valve 200 operates in response to a pressure difference between communication path 144 (upstream side) and muffler space 143 (downstream side). Specifically, the check valve 200 is configured to: the communication path 144 is blocked when the pressure difference is smaller than a predetermined value, and the communication path 144 is opened when the pressure difference is larger than the predetermined value.

The discharge chamber 142 is connected to the high-pressure side of the refrigerant circuit of the air conditioning system via a discharge passage constituted by a communication passage 144, a check valve 200, a muffler space 143, and a discharge port 106 a. In addition, the backflow of the refrigerant gas from the high-pressure side of the refrigerant circuit of the air conditioning system toward the discharge chamber 142 is suppressed by the check valve 200.

The refrigerant on the low-pressure side of the refrigerant circuit of the air conditioning system (refrigerant before compression) is guided to the suction chamber 141 through the suction passage 104 a. 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 to the discharge chamber 142. That is, in the present embodiment, the cylinder bore 101a and the piston 136 constitute a compression portion that compresses the refrigerant in the suction chamber 141. The refrigerant compressed by the compression unit and discharged into the discharge chamber 142 (compressed refrigerant, hereinafter referred to as "discharge refrigerant") is then guided to the high-pressure side of the refrigerant circuit of the air conditioning system via the discharge passage.

A control valve 300 is also provided at the cylinder head 104. The control valve 300 is disposed in a valve accommodating chamber 104b formed in the cylinder head 104.

The control valve 300 has an internal passage constituting a part of the supply passage 145, and the supply passage 145 supplies the refrigerant (discharged refrigerant) in the discharge chamber 142 to the crank chamber 140. The control valve 300 is configured to control a supply amount (pressure supply amount) of the discharge refrigerant to the crank chamber 140 by adjusting an opening degree (passage cross-sectional area) of the internal passage (i.e., the supply passage 145). In addition, the supply path 145 and the control valve 300 will be described later.

The crank chamber 140 communicates with the suction chamber 141 via a discharge passage formed by the communication passage 101c and the space 101d formed in the cylinder block 101 and the fixed throttle 103c formed in the valve plate 103, and the refrigerant in the crank chamber 140 flows into the suction chamber 141 via the discharge passage.

Therefore, by controlling the supply amount of the discharge refrigerant to the crank chamber 140 by the control valve 300, the pressure in the crank chamber 140 can be changed (adjusted), and the discharge capacity of the variable capacity compressor 100 can be changed by changing the inclination angle of the swash plate 111, that is, the stroke amount of the piston 136.

Specifically, by changing the pressure in the crank chamber 140, the inclination angle of the swash plate 111 can be changed by the pressure difference between the front and rear sides of each piston 136, in other words, the pressure difference between the compression chamber and the crank chamber 140 in the cylinder bore 101a sandwiching the piston 136, and as a result, the stroke amount of the piston 136 changes, and the discharge capacity of the variable displacement compressor 100 changes. Specifically, when the pressure in the crank chamber 140 is decreased, the inclination angle of the swash plate 111 increases, and the stroke amount of the piston 136 increases, thereby increasing the discharge capacity of the variable capacity compressor 100.

In other words, in the variable capacity compressor 100, the crank chamber 140 has the following functions: the discharge capacity of the variable displacement compressor 100 is changed by changing the state of the compression portion (specifically, the stroke amount of the piston 136) according to the internal pressure. Therefore, in the present embodiment, the crank chamber 140 corresponds to the "pressure control chamber" of the present invention. In addition, the control valve 300 is mainly used to adjust the pressure of the crank chamber 140.

Next, the supply path 145 will be described.

As shown in fig. 1, in the present embodiment, an O-ring 300a, an O-ring 300b, an O-ring 300c, and an O-ring 300d are attached to the outer peripheral surface of the control valve 300 from the opening side of the valve housing chamber 104b into which the control valve 300 is inserted toward the bottom side of the valve housing chamber 104 b. The inside and the outside space of the valve housing chamber 104b are partitioned by the O-ring 300a, and the outside space of the control valve 300 in the valve housing chamber 104b is partitioned into a first outside space 104b1 between the O-ring 300c and the O-ring 300d, a second outside space 104b2 between the O-ring 300b and the O-ring 300c, and a third outside space 104b3 on the bottom side of the valve housing chamber 104b with respect to the O-ring 300 d.

The first outer space 104b1 communicates with the discharge chamber 142 via a communication path 104c formed in the cylinder head 104. The second outer space 104b2 communicates with the crank chamber 140 via a communication path 104d formed in the cylinder head 104 and a communication path 101e formed in the cylinder block 101. The third outer space 104b3 communicates with the suction chamber 141 via a communication path 104e formed in the cylinder head 104.

Further, in the present embodiment, the supply passage 145 is formed by the communication path 104c, the first outside space 104b1, the above-described internal passage of the control valve 300, the second outside space 104b2, the communication path 104d, and the communication path 101 e.

Next, a first embodiment of the control valve 300 will be described with reference to fig. 2 and 3. Fig. 2 is a sectional view showing a first embodiment of the control valve 300, and fig. 3 is an enlarged view of a main portion of fig. 2.

As shown in fig. 2, the control valve 300 includes a valve main body 311, a cover member 312, a pressure-sensitive device 330, a solenoid housing 341, a fixed iron core 342, a movable iron core 343, a biasing member 344, a housing member 345, a coil assembly 346, and a valve unit 350.

The valve main body 311 is formed in a substantially cylindrical shape. The lid member 312 is formed in a bottomed cylindrical shape, and is fixed to one end of the valve main body 311 on the bottom side of the valve housing chamber 104 b. The cover member 312 forms a pressure sensing chamber 313 in cooperation with a concave portion 311b formed on one end surface 311a of the valve main body 311. The pressure sensing chamber 313 communicates with an outer space of the cover member 312, here, the third outer space 104b3 communicating with the suction chamber 141, via a communication hole 312a formed in the bottom of the cover member 312. Therefore, the pressure Ps of the suction chamber 141 acts on the pressure sensing chamber 313.

The valve body 311 has a fitting hole 314, a valve chamber 315, a valve hole 316, and a support hole 317 formed in this order from the other end surface 311c toward the one end surface 311 a. The fitting hole 314, the valve chamber 315, the valve hole 316, and the support hole 317 are disposed on a center line X of the valve body 311 (the center line of the control valve 300). That is, the fitting hole 314, the valve chamber 315, the valve hole 316, and the support hole 317 have the same center line.

The fitting hole 314 is formed as a cylindrical hole that opens toward the other end surface 311c of the valve body 311. A large diameter portion 342b (described later) of the fixed core 342 is press-fitted into the fitting hole 314. The valve chamber 315 is formed as a cylindrical space that opens toward the bottom surface of the fitting hole 314. The valve chamber 315 is provided with a valve portion 351 (described later) of the valve unit 350. The valve hole 316 is formed (opened) in the bottom surface of the valve chamber 315. The valve hole 316 is opened and closed by the valve portion 351 of the valve unit 350. The support hole 317 extends linearly from the valve hole 316 to the pressure sensing chamber 313. That is, in the present embodiment, the valve hole 316 has an opening on the valve chamber side 315 opening into the valve chamber 315 and an opening on the support hole 317 side connected (communicated) to the support hole 317, and the support hole 317 is formed so as to communicate the valve hole 316 with the pressure sensing chamber 313. A pressure sensing lever 352 (described later) of the valve unit 350 is slidably supported by the support hole 317. In the present embodiment, the valve hole 316 and the bearing hole 317 are formed as one continuous hole, and the valve hole 316 and the bearing hole 317 have the same diameter.

Further, the valve main body 311 is formed with a first port 320 and a second port 321. The first port 320 and the second port 321 are formed on both sides of the valve hole 31 in the center line X direction of the valve body 311, i.e., are formed separately in the center line X direction.

One end of the first port 320 opens at a first position between the O-ring 300c and the O-ring 300d on the outer peripheral surface of the valve main body 311, that is, at a position in the first outer space 104b1 communicating with the discharge chamber 142. The first port 320 is formed from the one end toward the center line X side, and the other end of the first port 320 is connected to the valve hole 316. That is, the first port 320 is formed to extend from the first portion of the outer circumferential surface of the valve body 311 to the valve hole 316. The valve hole 316 is open at the bottom surface of the valve chamber 315. Therefore, the valve chamber 315 communicates with the first outer space 104b1 via the valve hole 316 and the first port 320, and the first outer space 104b1 communicates with the discharge chamber 142.

One end of the second port 321 opens to a second portion between the O-ring 300b and the O-ring 300c on the outer peripheral surface of the valve body 311, that is, a portion corresponding to the second outer space 104b2, where the second outer space 104b2 communicates with the crank chamber 140. The second port 321 is formed from the one end toward the center line X side, and the other end of the second port 321 opens to the inner circumferential surface of the valve chamber 315. That is, the second port 321 is formed to extend from the second portion of the outer peripheral surface of the valve body 311 to the valve chamber 315. Therefore, the valve chamber 315 also communicates with the second outside space 104b2 via the second port 321, wherein the second outside space 104b2 communicates with the crank chamber 140.

Here, in the present embodiment, the first port 320 is inclined so as to approach the opening on the valve chamber 315 side of the valve hole 316 from the one end side of the first portion opened to the outer peripheral surface of the valve body 311 toward the center line X side, specifically, as shown in fig. 3, the first port 320 is formed such that the port center line Y of the first port 320 is inclined at a predetermined angle α (< 90 °) with respect to a plane (orthogonal plane) P orthogonal to the center line X of the valve body 311 (the center line of the valve hole 316), and the predetermined angle α can be arbitrarily set, but is preferably set within a range of 30 to 60 °.

In the present embodiment, an extension line of the port center line Y of the first port 320 is set to an opening on the valve chamber 315 side of the valve hole 316, and more specifically, the second port 321 is set to the other end facing the second port 321, the second port 321 being opened to the inner peripheral surface of the valve chamber 315.

In addition, although not particularly limited, in the present embodiment, the first portion where the one end of the first port 320 is opened is located radially outward of the support hole 317. On the contrary, the support hole 317 is disposed radially inward of the first portion of the outer peripheral surface of the valve main body 311, in which the one end of the first port 320 is opened.

The pressure sensing device 330 is disposed in the pressure sensing chamber 313. The pressure-sensitive device 330 has: a bellows 330a having one end of the bellows 330a opened and the other end sealed; an end member 330b, the end member 330b closing one end of the corrugated tube 330 a; a stopper member 330c disposed in the bellows 330a and restricting contraction of the bellows 330 a; a first biasing member (compression coil spring) 330d which is disposed inside the bellows 330a and biases the bellows 330a in a direction of extending; and an urging member (compression coil spring) 330e disposed between the end member 330b and the valve body 311 and urging the bellows 330a in a direction in which the end member 330b contracts.

The inside of the bellows 330a is in a vacuum state, and the bellows 330a expands and contracts in response to the pressure of the pressure sensing chamber 313 (i.e., the pressure Ps of the suction chamber 141). Specifically, the bellows 330a expands as the pressure in the pressure sensing chamber 313 (i.e., the pressure Ps in the suction chamber 141) decreases.

The solenoid housing 341 holds or accommodates the fixed iron core 342, the movable iron core 343, the urging member 344, the accommodating member 345, and the coil assembly 346.

The solenoid housing 341 includes: a cylindrical peripheral wall portion 341 a; and an end wall portion 341b fixed to one end of the peripheral wall portion 341 a. A fitting hole 341c is formed in an end wall portion 341b of the solenoid case 341, and a predetermined range on the other end surface 311c side of the valve body 311 is press-fitted into the fitting hole 341 c.

The fixed core 342 has a small diameter portion 342a on one end surface side and a large diameter portion 342b on the other end surface side having a larger diameter than the small diameter portion 342 a. An insertion hole 342c is formed through the fixed core 342 in the axial direction. The small diameter portion 342a is housed in the solenoid case 341, the large diameter portion 342b is press-fitted into the fitting hole 314, and the fitting hole 314 is formed in the other end surface 311c of the valve body 311.

The movable core 343 is disposed with a predetermined gap from the one end surface of the fixed core 342. In addition, the solenoid housing 341, the fixed iron core 342, and the movable iron core 343 are formed of a magnetic material.

The biasing member 344 is disposed between the fixed core 342 and the movable core 343, and biases the movable core 343 and the one end surface of the fixed core 342 in a direction of separating them from each other. In the present embodiment, a compression coil spring is used as the urging member 344.

The housing member 345 is formed in a bottomed cylindrical shape from a nonmagnetic material. The housing member 345 houses the small diameter portion 342a of the fixed core 342, the movable core 343, and the biasing member 344. The movable iron core 343 is provided slidably along the inner peripheral surface of the housing member 345 and is movable in the housing member 345 in a direction of being separated from and contacting the one end surface of the fixed iron core 342.

The coil assembly 346 includes a solenoid coil (hereinafter, simply referred to as "coil") 346a and a blocking member 346 b. The coil 346a is covered with resin and is disposed around the housing member 345. The blocking member 346b is formed of a magnetic material, and blocks the other end of the peripheral wall portion 341a of the solenoid housing 341. The blocking member 346b is disposed around the movable iron core 343 in the radial direction, and is integrated with the coil 346a by resin. In fig. 2, reference numeral 346c denotes a resin portion of the coil assembly 346.

When the coil 346a is energized, the solenoid case 341, the fixed core 342, and the blocking member 346b of the coil assembly 346 form a magnetic path, and generate an electromagnetic force that moves the movable core 343 toward the one end surface of the fixed core 342 against the urging force of the urging member 344.

The valve unit 350 includes a valve portion 351, a pressure sensing lever 352, and a solenoid lever 353, which are integrally coupled.

The valve portion 351 is housed in the valve chamber 315 and opens and closes the valve hole 316. Specifically, the valve section 351 is configured to: the peripheral edge of the end portion on the valve hole 316 side is separated from and brought into contact with the valve seat portion 316a around the valve hole 316 on the bottom surface of the valve chamber 315, whereby the valve hole 316 is opened and closed.

The pressure sensing lever 352 is slidably supported by a support hole 317 formed in the valve main body 311. One end of the pressure sensing rod 352 is connected to the center of the end portion of the valve portion 351 on the side of the valve hole 316, and the other end of the pressure sensing rod 352 is connected to the end member 330b of the pressure sensing device 330 so as to be separable.

As shown in fig. 3, the pressure sensing lever 352 includes a large diameter portion 352a, a small diameter portion 352b having a smaller diameter than the large diameter portion 352a, and a tapered portion 352c provided between the large diameter portion 352a and the small diameter portion 352b and having a gradually reduced diameter, the large diameter portion 352a being slidably supported by the support hole 317, the small diameter portion 352b being inserted into the valve hole 316 and connected to the end portion of the valve portion 351 on the valve hole 316 side, the tapered portion 352c being disposed in the vicinity of a boundary between the valve hole 316 and the support hole 317, the tapered portion 352c being formed such that an angle β formed by an outer peripheral surface of the tapered portion 352c and the orthogonal plane P is larger than an angle α formed by a port center line Y of the first port 320 and the orthogonal plane P, but not limited thereto, the tapered portion 352c may be formed such that an angle β formed by an outer peripheral surface of the tapered portion 352c and the orthogonal plane P is equal to an angle α formed by the port center line Y of the first port 320 and the orthogonal plane P.

The solenoid rod 353 is inserted through an insertion hole 342c formed in the fixed core 342 with a gap. One end of the solenoid rod 353 is connected to an end of the valve portion 351 on the side opposite to the valve hole 316, and the other end of the solenoid rod 353 is connected to the plunger 343. In the present embodiment, the valve portion 351 and the solenoid rod 353 are formed to have the same diameter, and an end portion of the solenoid rod 353 constitutes the valve portion 351.

Here, as described above, in the pressure sensing device 330, the bellows 330a expands and contracts in response to the pressure of the pressure sensing chamber 313, that is, the pressure Ps of the suction chamber 141. When the bellows 330a extends to a predetermined length or more as the pressure Ps of the suction chamber 141 decreases, the end member 330b is coupled to the other end of the pressure sensing rod 352 of the valve unit 350, and the valve portion 351 is biased in a direction (valve opening direction) in which the valve hole 316 is opened via the pressure sensing rod 352. That is, the pressure-sensitive device 330 is configured to: operates in response to the pressure Ps of the suction chamber 141, and applies a biasing force in the valve opening direction to the valve portion 351 via the pressure sensing lever 352.

When the coil 346a is energized, a magnetic path is formed by the solenoid case 341, the fixed core 342, and the blocking member 346b of the coil assembly 346, and an electromagnetic force is generated to move the movable core 343 toward the one end surface of the fixed core 342 against the urging force of the urging member 344. When the movable iron core 343 is moved by the generated electromagnetic force, the valve portion 351 is biased in a direction (valve closing direction) for closing the valve hole 316 via the solenoid rod 353. Therefore, in the present embodiment, the solenoid case 341, the fixed iron core 342, the movable iron core 343, the coil 346a, and the blocking member 346b constitute a "solenoid portion" that applies a biasing force in the valve closing direction to the valve portion 351 via the solenoid rod 353.

In the control valve 300 of the present embodiment, when (the valve portion 351 of) the valve unit 350 opens the valve hole 316, the discharge refrigerant flows from the discharge chamber 142 to the first outer space 104b1 via the communication path 104c, and flows into the control valve 300 from the first port 320. The discharged refrigerant that has flowed into the control valve 300 flows through the valve hole 316 and the valve chamber 315, and then flows out from the second port 321 to the second outer space 104b 2. Then, the discharge refrigerant flowing out to the second outer space 104b2 flows (is supplied) to the crank chamber 140 via the communication path 104d and the communication path 101 e.

Therefore, in the present embodiment, the internal passage of the control valve 300 constituting a part of the supply passage 145 is formed by the first port 320, the valve hole 316, the valve chamber 315, and the second port 321. The first port 320 corresponds to an "inlet port" of the present invention, the second port 321 corresponds to an "outlet port" of the present invention, and the valve hole 316 and the valve chamber 315 correspond to a "connection path" of the present invention.

Next, the operation of the control valve 300 will be described.

In the present embodiment, the support hole 317 has the same diameter as the valve hole 316. In the valve portion 351, the valve hole 316 is opened and closed by separating and contacting the peripheral edge portion of the valve portion 351 with the valve seat portion 316a around the valve hole 316. Therefore, the force generated by the pressure Pd acting on the discharge chamber 142 of the valve portion 351 is substantially equal to the opposite force generated by the pressure Pd acting on the discharge chamber 142 of (the large diameter portion 352a of) the pressure sensing rod 352. The area of the valve unit 350 that receives the pressure Pc in the crank chamber 140 is much smaller than the pressure-sensitive area of the bellows 330 a. Therefore, in the control valve 300, the valve unit 350 is hardly affected by the pressure Pd of the discharge chamber 142 and the pressure Pc of the crank chamber 140, and the valve hole 316 is opened and closed based on the energization amount of the coil 346a and the pressure Ps of the suction chamber 141. The amount of current to be supplied to the coil 346a is set by, for example, a control device (not shown) of the air conditioning system described above based on air conditioning settings (vehicle interior set temperature), external environment, and the like.

When the pressure Ps of the suction chamber 141 is higher than a predetermined value (set pressure) corresponding to the energization amount of the coil 346a, the control valve 300 decreases the opening degree of the valve hole 316 to decrease the supply amount of the discharge refrigerant to the crank chamber 140. As a result, the pressure Pc in the crank chamber 140 decreases, the inclination angle of the swash plate 111 increases, and the discharge capacity of the variable capacity compressor 100 increases. On the other hand, when the pressure Ps of the suction chamber 141 is lower than the set pressure, the control valve 300 increases the opening degree of the valve hole 316 to increase the supply amount of the discharge refrigerant to the crank chamber 140. As a result, the pressure Pc in the crank chamber 140 increases, the inclination angle of the swash plate 111 decreases, and the discharge capacity of the variable capacity compressor 100 decreases.

That is, the control valve 300 is configured to: the opening degree of the valve hole 316 is autonomously controlled by (the valve portion 351 of) the valve unit 350 so that the pressure Ps of the suction chamber 141 approaches the set pressure corresponding to the energization amount of the coil 346a, whereby the discharge capacity of the variable capacity compressor 100 is changed.

In the control valve 300 of the present embodiment, as described above, the first port 320 is formed obliquely so as to approach the opening on the valve chamber 315 side of the valve hole 316 as it goes from the one end opened on the outer peripheral surface of the valve body 311 toward the center line X side, in other words, the first port 320 is formed obliquely so as to go away from the support hole 317 as it goes from the one end toward the center line X side, specifically, the first port 320 is formed obliquely so that the center line Y of the first port 320 has a predetermined angle α (< 90 °) with respect to an orthogonal plane P orthogonal to the center line X of the valve body 311 (valve hole 316), and therefore, the discharge refrigerant flowing into the control valve 300 from the one end of the first port 320 is directed to pass through the first port 320 and then to go toward the opening on the valve chamber 315 side of the valve hole 316 (go away from the support hole 317).

Therefore, the discharged refrigerant flowing through the first port 320 flows out of the second port 321 through the valve hole 316 and the valve chamber 315, almost without going toward the support hole 317. Therefore, even when the discharge refrigerant contains foreign matter, the foreign matter contained in the discharge refrigerant can be prevented from entering the support hole 317, specifically, the foreign matter contained in the discharge refrigerant can be prevented from entering a gap between (the large diameter portion 352a of) the outer peripheral surface of the pressure sensing rod 352 and the inner peripheral surface of the support hole 317, and stable operation of the valve unit 350 can be ensured.

In particular, in the present embodiment, the extension line of the port center line Y of the first port 320 is set to pass through the valve chamber 315-side opening of the valve hole 316, and is set to face the other end of the second port 321 that opens into the valve chamber 315. Therefore, the discharged refrigerant flowing through the first port 320 flows directly into the valve hole 316 and further flows directly into the second port 321. Therefore, the pressure loss is reduced, and the foreign matter contained in the discharged refrigerant is more effectively prevented from entering the support hole 317.

In addition, in the present embodiment, the angle β formed by the outer peripheral surface of the tapered portion 352c of the pressure sensing rod 352 disposed in the vicinity of the boundary between the valve hole 316 and the support hole 317 and the orthogonal plane P is formed to be equal to or greater than the angle α formed by the port center line Y of the first port 320 and the orthogonal plane P, and therefore, the discharge refrigerant flowing into the control valve 300 from the one end of the first port 320 is directed toward the valve hole 316 (away from the support hole 317) by the outer peripheral surface of the tapered portion 352c of the pressure sensing rod 352 in addition to the first port 320, and therefore, intrusion of foreign matter contained in the discharge refrigerant into the support hole 317 is more effectively prevented.

As shown in fig. 2, in the present embodiment, the O-ring 300c defining the first outer space 104b1 (in other words, the pressure region on the first port 320 side) communicating with the discharge chamber 142 and the second outer space 104b2 (in other words, the pressure region on the second port 321 side) communicating with the crank chamber 140 is disposed radially outward of the other end (the connection end connected to the valve hole 316) of the first port 320. Therefore, when the first port 320 is inclined, the increase in the length of the valve main body 311 in the center line X direction and the increase in the size of the control valve 300 are suppressed.

In the above embodiment, the first port 320 is formed obliquely so as to be closer to the valve chamber 315 side of the valve hole 316 as going from the one end opened on the outer peripheral surface of the valve body 311 toward the center line X side. That is, the entirety of the first port 320 is formed obliquely. However, without being limited thereto, it may be formed obliquely as follows: a part of the first port 320 (particularly, a part on the valve hole 316 side) is closer to the opening on the valve chamber 315 side of the valve hole 316 as it goes from the outer peripheral surface side of the valve body 311 toward the center line X side. In addition to or instead of the entire or part of the first port 320 being formed obliquely, a guide part that is inclined so as to approach the opening of the valve chamber 315 side of the valve hole 316 as it goes from the outer peripheral surface side of the valve body 311 toward the center line X side may be provided in the first port 320 to guide the discharged refrigerant flowing in the first port 320 to the opening of the valve chamber 315 side of the valve hole 316.

Next, a second embodiment of the control valve 300 will be described with reference to fig. 4 and 5. Fig. 4 is a sectional view showing a second embodiment of the control valve 300, and fig. 5 is an enlarged view of a main portion of fig. 4. Note that the same reference numerals are given to the same elements as those of the first embodiment, and the description thereof will be omitted, and the description will be mainly given of the structure different from that of the first embodiment. Although not shown, in the second embodiment, the opening and the bottom of the valve accommodating chamber 104b are disposed in the opposite direction to the first embodiment.

In the second embodiment, an O-ring 301a, an O-ring 301b, and an O-ring 301c are attached to the outer peripheral surface of the control valve 300 from the opening side to the bottom side of the valve housing chamber 104 b. The inside and the outside space of the valve housing chamber 104b are blocked by the O-ring 301a, and the outside space of the control valve 300 in the valve housing chamber 104b is divided into a first outside space 104b1 between the O-ring 301b and the O-ring 301c, a second outside space 104b2 on the bottom side of the valve housing chamber 104b with respect to the O-ring 301c, and a third outside space 104b3 between the O-ring 301a and the O-ring 301 b.

Further, as in the first embodiment, the first outer space 104b1 communicates with the discharge chamber 142 via a communication path 104c formed in the cylinder head 104, the second outer space 104b2 communicates with the crank chamber 140 via a communication path 104d formed in the cylinder head 104 and a communication path 101e formed in the cylinder block 101, and the third outer space 104b3 communicates with the suction chamber 141 via a communication path 104e formed in the cylinder head 104. In addition, as described above, in the second embodiment, the opening and the bottom of the valve accommodating chamber 104b are disposed opposite to those of the first embodiment, and therefore, the second outer space 104b2 and the third outer space 104b3 are opposite to the second outer space 104b2 and the third outer space 104b3 of the first embodiment (fig. 2).

In the second embodiment, the control valve 300 includes a valve main body 360, a partition member 370, a pressure-sensitive device 331, a solenoid housing 380, a fixed iron core 342, a movable iron core 343, an urging member 344, an accommodating member 345, a coil 346a, and a valve unit 390.

A first pressure sensing chamber 361 is formed on the bottom side of the valve accommodating chamber 104b, i.e., on one end surface 360a of the valve main body 360. The first pressure sensing chamber 361 is formed as a cylindrical space opened to one end surface 360a of the valve main body 360.

A fitting hole 362 is formed in the other end surface 360b of the valve main body 360. The fitting hole 362 is formed as a substantially cylindrical hole that opens to the other end surface 360b of the valve body 360, and a valve hole 316 is formed (opened) in the bottom surface of the fitting hole 362. Specifically, in the present embodiment, the bottom surface of the fitting hole 362 has a flat portion at the center and a tapered portion that gradually increases in depth from the peripheral edge portion to the flat portion, and the valve hole 316 is formed (opened) in the flat portion at the center. The valve hole 316 is formed such that the inside of the fitting hole 362 communicates with the first pressure sensing chamber 361.

The first pressure sensing chamber 361, the fitting hole 362, and the valve hole 316 are disposed on a center line (a center line of the control valve 300) X of the valve body 360 (have the same center line).

The large diameter portion 342b of the fixed core 342 is press-fitted into the open end of the fitting hole 362, and the partition member 370 is press-fitted into a predetermined portion of the fitting hole 362 on the bottom surface side of the open end. The partition member 370 partitions the inside of the fitting hole 362 into: a valve chamber 315 on the bottom surface side, in which the valve hole 316 opens; and a second pressure sensing chamber 363 press-fitted into the large diameter portion 342b side of the fixed core 342 fixed to the opening end. In other words, the partition member 370 constitutes a partition wall that partitions the valve chamber 315 and the second pressure sensing chamber 363 within the fitting hole 362. Therefore, in the present embodiment, the valve hole 316 has: an opening on the side of the valve chamber 315 that opens into the valve chamber 315; and an opening on the side of the first pressure sensing chamber 361 that opens into the first pressure sensing chamber 361.

The partition member 370 has a tapered portion 371, and the tapered portion 371 protrudes toward the bottom surface of the fitting hole 362 and is gradually reduced in diameter. The tapered portion 371 is disposed coaxially with the center line X and extends to the vicinity of the valve hole 316. The outer peripheral surface of the tapered portion 371 forms an inclined surface that approaches the valve hole 316 toward the center line X side from the outer peripheral surface side of the valve body 360 in the valve chamber 315.

The partition member 370 is provided with a support hole 372, and the support hole 372 slidably supports a valve body 391 (described later) of the valve unit 390. The support hole 372 is arranged coaxially with the center line X of the valve main body 360 and has a diameter slightly larger than the valve hole 316. One end of the support hole 372 opens into the front end surface of the tapered portion 371 (i.e., into the valve chamber 315), and the other end of the support hole 372 opens into the second pressure sensing chamber 363.

A first port 364, a second port 365 and a third port 366 are also formed in the valve body 360. The first to third ports 364 to 366 are formed apart from each other in the center line X direction of the valve body 360. Specifically, the first port 364 and the second port 365 are disposed on both sides of the valve body 360 in the center line X direction so as to sandwich the valve hole 316, and the third port 366 is disposed closer to the other end surface 360b of the valve body 360 than the first port 364. That is, the second port 365, the first port 364, and the third port 366 are arranged in this order from the one end surface 360a to the other end surface 360b of the valve main body 360.

One end of the first port 364 opens at a first position between the O-

rings

301b and 301c on the outer peripheral surface of the valve main body 360, that is, at a position in the first outer space 104b1 communicating with the discharge chamber 142. The first port 364 is formed from the one end toward the center line X side, and the other end of the first port 364 opens to a portion of the inner circumferential surface of the valve chamber 315 corresponding to the tapered portion 371 of the partition member 370. That is, the first port 364 is formed to extend from the first portion of the outer peripheral surface of the valve main body 360 to the valve chamber 315, the valve chamber 315 communicates with the first outer space 104b1 via the first port 364, and the first outer space 104b1 communicates with the discharge chamber 142.

One end of the second port 365 opens to a portion of the outer peripheral surface of the valve main body 360 on the side of the one end surface 360a with respect to the O-ring 301c, that is, to a portion of the second outer space 104b2 communicating with the crank chamber 140. The second port 365 is formed from the one end toward the center line X side, and the other end of the second port 365 opens to the inner circumferential surface of the first pressure sensing chamber 361. That is, the second port 365 is formed to extend from the second portion of the outer peripheral surface of the valve body 360 to the first pressure sensing chamber 361, and the first pressure sensing chamber 361 communicates with the valve chamber 315 via the valve hole 316. Therefore, the valve chamber 315 communicates with the second outer space 104b2 via the valve hole 316, the first pressure sensing chamber 361, and the second port 365, and the second outer space 104b2 communicates with the crank chamber 140.

One end of the third port 366 opens at a third position between the O-ring 301a and the O-ring 301b on the outer peripheral surface of the valve main body 360, that is, at a position in the third outer space 104b3 that communicates with the suction chamber 141. The third port 366 is formed from the one end toward the center line X side, and the other end of the third port 366 opens to the inner circumferential surface of the second pressure sensing chamber 363. Therefore, the pressure Ps of the suction chamber 141 acts on the second pressure sensing chamber 363.

The pressure sensing device 331 is accommodated in the first pressure sensing chamber 361. The pressure sensing device 331 includes: a serpentine bellows 331 a; a first end member 331b that closes one end of the corrugated tube 331 a; a second end member 331c that closes off the other end of the corrugated tube 331 a; and an urging member (compression coil spring) 331d disposed inside the corrugated tube 331a and urging the corrugated tube 331a in a direction to expand the corrugated tube 331 a. In the present embodiment, the first end member 331b and the second end member 331c each have a stopper portion for restricting contraction of the corrugated tube 331a in the corrugated tube 331 a. The second end member 331c further includes a lid portion that closes an open end of the first pressure sensing chamber 361. That is, the second end member 331c also serves as a lid member that closes the open end of the first pressure sensing chamber 361.

The solenoid case 380 holds or accommodates the fixed iron core 342, the movable iron core 343, the urging member 344, the accommodating member 345, and the coil 346 a.

The solenoid housing 380 includes: a cylindrical peripheral wall portion 380 a; and an end wall portion 380b fixed to one end of the peripheral wall portion 380 a. A fitting hole 380c is formed in an end wall portion 380b of the solenoid case 380, and a predetermined range on the side of the other end surface 360b of the valve main body 360 is press-fitted into the fitting hole 380 c. In the present embodiment, the other end side of the peripheral wall portion 380a of the solenoid case 380 is formed in a shape corresponding to the blocking member 346b of the coil assembly 346 of the first embodiment. That is, the peripheral wall portion 380a of the solenoid case 380 of the present embodiment has functions as the peripheral wall portion 341b of the solenoid case 341 and the blocking member 346b of the coil assembly 346 of the first embodiment.

When the coil 346a is energized, the solenoid case 380 and the fixed iron core 342 form a magnetic path, and an electromagnetic force is generated against the urging force of the urging member 344 to move the movable iron core 343 to the one end surface of the fixed iron core 342.

The valve unit 390 includes a valve body 391, a pressure sensing rod 392, and a solenoid rod 393, which are integrally coupled.

The valve body 391 is formed in a cylindrical shape. The valve body 391 is slidably supported by the support hole 372 of the partition member 370. One end of the valve body 391 is disposed in the valve chamber 315, and constitutes a valve portion 391a that opens and closes the valve hole 316. Specifically, the valve portion 391a opens and closes the valve hole 316 by separating and contacting a peripheral edge portion of the valve portion 391a from and with the valve seat portion 316a around the valve hole 316 in the bottom surface of the valve chamber 315. The other end of the valve body 391 is disposed in the second pressure sensing chamber 363, and constitutes a pressure receiving portion 391b that receives the pressure of the second pressure sensing chamber 363 (i.e., the pressure Ps of the suction chamber 141).

The pressure sensing rod 392 is formed to have a diameter smaller than that of the valve body 391, and is inserted through the valve hole 316. One end of the pressure-sensitive rod 392 is connected to the center of the valve portion 391a of the valve body 391, and the other end of the pressure-sensitive rod 392 is connected to the first end member 331b of the pressure-sensitive device 331 so as to be separable.

The solenoid rod 393 is formed to have a diameter smaller than that of the valve body 391, and is inserted through an insertion hole 342c formed in the fixed core 342 with a gap, similarly to the pressure sensitive rod 392. One end of the solenoid rod 393 is connected to the center of the pressure receiving portion 391b of the valve body 391, and the other end of the solenoid rod 393 is connected to the movable iron core 343.

In the pressure sensing device 331, the bellows 331a expands and contracts in response to the pressure of the second pressure sensing chamber 363 received by the pressure receiving portion 391b of the valve body 391, that is, the pressure Ps of the suction chamber 141, when the pressure sensing rod 392 of the valve unit 390 is coupled to the first end member 331 b. When the bellows 331a expands as the pressure Ps of the suction chamber 141 decreases, the valve body 391 (valve portion 391a) is biased in a direction (valve opening direction) in which the valve hole 316 is opened via the pressure sensitive lever 392. That is, the pressure sensing device 331 is configured to be similar to the pressure sensing device 330 of the first embodiment: the valve body 391 (valve portion 391a) is operated in response to the pressure Ps in the suction chamber 141, and is biased in the valve opening direction by a biasing force applied via a pressure sensing lever 392.

When the coil 346a is energized, a magnetic path is formed by the solenoid case 380 and the fixed iron core 342, and an electromagnetic force is generated to move the movable iron core 343 toward the one end surface of the fixed iron core 342 against the urging force of the urging member 344. When the movable iron core 343 is moved by the generated electromagnetic force, the valve body 391 (valve portion 391a) is biased in a direction (valve closing direction) to close the valve hole 316 via the solenoid rod 393. Therefore, in the present embodiment, the solenoid case 380, the fixed iron core 342, the movable iron core 343, and the coil 346a constitute a "solenoid portion" that applies a biasing force in the valve closing direction to the valve portion 391a via the solenoid rod 393.

In the control valve 300 of the present embodiment, when (the valve portion 391a of) the valve body 391 of the valve unit 390 opens the valve hole 316, the discharge refrigerant flows from the discharge chamber 142 to the first outer space 104b1 via the communication path 104c, and flows into the control valve 300 from the first port 364. The discharged refrigerant flowing into the control valve 300 flows through the valve chamber 315, the valve hole 316, and the first pressure sensing chamber 361, and then flows out from the second port 365 to the second outer space 104b 2. Then, the discharge refrigerant flowing out to the second outer space 104b2 flows (is supplied) to the crank chamber 140 via the communication path 104d and the communication path 101 e.

Therefore, in the present embodiment, the internal passage of the control valve 300 constituting a part of the supply passage 145 is formed by the first port 364, the valve chamber 315, the valve hole 316, the first pressure sensing chamber 361, and the second port 365. The first port 364 corresponds to the "inlet port" of the present invention, the second port 365 corresponds to the "outlet port" of the present invention, and the valve chamber 315, the valve hole 316, and the first pressure sensing chamber 361 correspond to the "connection path" of the present invention. The valve chamber 315 mainly constitutes "a connection path on the inlet port side of the valve hole" in the present invention.

Here, as described above, in the present embodiment, the other end of the first port 364 opens to a portion of the inner peripheral surface of the valve chamber 315 corresponding to the tapered portion 371 of the partition member 370. That is, the tapered portion 371 of the partitioning member 370 is provided to face the opening of the valve chamber 315 of the first port 364. The outer peripheral surface of the tapered portion 371 forms an inclined surface that approaches the valve hole 316 in the valve chamber 315 toward the center line X from the outer peripheral surface side of the valve body 360. In other words, the outer peripheral surface of the tapered portion 371 forms an inclined surface that is opened toward the valve chamber 315 side of the valve hole 316 from the outer peripheral surface side of the valve body 360 toward the center line X side. Therefore, the discharge refrigerant flowing into the valve chamber 315 from the first port 364 is guided to the valve hole 316 by the outer peripheral surface of the tapered portion 371. That is, the discharge refrigerant flows along the outer peripheral surface of the tapered portion 371 and is directed toward the valve hole 316.

Therefore, the discharge refrigerant flowing into the valve chamber 315 from the first port 364 hardly flows toward the support hole 372, and the discharge refrigerant flowing into the valve chamber 315 from the first port 364 flows through the valve hole 316 and the first pressure sensing chamber 361 and flows out from the second port 365. As a result, even when the discharge refrigerant contains foreign matter, the foreign matter contained in the discharge refrigerant is prevented from entering the gap between the outer circumferential surface of the valve body 391 and the inner circumferential surface of the support hole 372, and stable operation of the valve unit 390 is ensured.

Here, the outer peripheral surface of the tapered portion 371 will be described as an inclined surface provided in the valve chamber 315 and approaching the valve hole 316 from the outer peripheral surface side of the valve body 360 toward the center line X side, in other words, as an inclined surface approaching the opening of the valve chamber 315 of the valve hole 316 from the outer peripheral surface side of the valve body 360 toward the center line X side. However, from another point of view, in the valve chamber 315, an annular flow passage inclined so as to approach the valve hole 316 from the outer peripheral surface side of the valve main body 360 toward the center line X side is formed by the outer peripheral surface of the tapered portion 371 of the partitioning member 370 and the inner surface of the valve chamber 315. In this case, the annular flow passage corresponds to the "connection path on the inlet port side of the valve hole" in the present invention.

However, in the second embodiment, the large diameter portion 342b of the fixed core 342 is press-fitted and fixed to the open end of the fitting hole 362 formed in the other end surface 360b of the valve body 360, and the partition member 370 is press-fitted and fixed to the predetermined portion of the fitting hole 362 on the bottom surface side of the open end, whereby the valve chamber 315 and the second pressure sensing chamber 363 are partitioned and formed inside the fitting hole 362. However, it is not limited thereto. For example, as shown in the enlarged view of the main part of fig. 6, the following structure may be adopted: the large diameter portion 342b of the fixed core 342 doubles as the partition member 370. In this case, the large diameter portion 342b of the fixed iron core 342 has a protruding portion 342b1 formed to protrude from the end wall portion 380b of the solenoid case 380, and the distal end side portion of the protruding portion 342b1 is formed to have a function as the partition member 70. Specifically, the protruding portion 342b1 of the large diameter portion 342b of the fixed core 342 has an internal space constituting the second pressure sensing chamber 363 and a communication hole constituting the third port 366, and a tapered portion 371 and a support hole 372 are formed on the front end side of the protruding portion 342b 1. The protruding portion 342b1 of the large diameter portion 342b of the fixed core 342 is press-fitted into the fitting hole 362 formed in the other end surface 360b of the valve body 360 from the distal end side to a predetermined range.

It is needless to say that the present invention is not limited to the above embodiments and modified examples, and further modifications and changes can be made based on the technical idea of the present invention.

(symbol description)

100 variable capacity compressors; 101a cylinder bore; 111a sloping plate; 136 piston; 140 crank chamber (pressure control chamber); 141 a suction chamber; 142 a discharge chamber; 145 supply path; 300a control valve; 311a valve body; 312a cover member; 312a communication hole; 313 pressure sensing chamber; 315 a valve chamber; a 316 valve bore; 317 supporting the hole; 320 a first port (inlet port); 321 second port (outlet port); 330a pressure sensing device; 341a solenoid can; 342a stationary core; 342a fixing the small diameter portion of the core; 342b a large diameter portion fixing the core; 342b1 projection; 350 a valve unit; 351 a valve portion; 352a pressure sensing lever; 352a large diameter portion; 352b small diameter portion; 352c a taper; 353 a solenoid rod; a 360 valve body; 361 a first pressure sensing chamber; 363 a second pressure sensing chamber; 364 first port (inlet port); 365 second port (outlet port); 366 a third port; 370 a partition member (partition wall); 371 pyramid part; 372 a support hole; 380 solenoid can; 390 valve unit; 391a valve core; 391a valve section; 391b a pressure receiving portion; the center line of the X control valve (valve body, valve bore); a Y port centerline; and an orthogonal plane where P is orthogonal to X.

Claims

1. A control valve for a variable displacement compressor including a suction chamber into which a refrigerant before compression is introduced, a compression portion that compresses the refrigerant in the suction chamber, a discharge chamber from which the compressed refrigerant compressed by the compression portion is discharged, and a pressure control chamber that changes a discharge capacity by changing a state of the compression portion in accordance with an internal pressure, the control valve controlling a supply amount of the refrigerant in the discharge chamber to the pressure control chamber,

the control valve is characterized by comprising:

a valve body having an inlet port that is opened at a first portion of an outer peripheral surface, is formed to face a center line side, and is configured to allow inflow of refrigerant in the discharge chamber, an outlet port that is opened at a second portion that is separated from the first portion of the outer peripheral surface in the center line direction, is formed to face the center line side, and is configured to allow outflow of refrigerant in the discharge chamber that has flowed in from the inlet port, and a connection path that connects the inlet port and the outlet port via a valve chamber and a valve hole that opens to the valve chamber;

a valve portion provided in the valve chamber and opening and closing the valve hole;

a solenoid portion that is provided on one side of the valve main body in the center line direction and applies an urging force in a valve closing direction to the valve portion via a solenoid rod; and

a pressure-sensitive device that is disposed in a pressure-sensitive chamber provided on the other side of the valve main body in the center line direction and that operates in response to pressure in the suction chamber to apply a biasing force in a valve opening direction to the valve portion via a pressure-sensitive rod,

the solenoid rod, the valve portion, and the pressure-sensitive rod are integrally connected to form a valve unit, the valve unit is slidably supported by a support hole extending in the center line direction and provided in the valve body so as to communicate with the valve hole,

in the case of the control valve described above,

at least one of the inlet port and the connection path on the inlet port side of the valve hole has an inclined portion that is inclined so as to approach the opening on the valve chamber side of the valve hole from the outer peripheral surface side toward the center line side.

2. The control valve of claim 1,

the support hole is disposed radially inward of the first portion of the outer peripheral surface where the inlet port opens.

3. The control valve according to claim 1 or 2,

the inlet port extends to the valve hole and is formed obliquely so as to approach the valve hole as going from the outer peripheral surface side toward the center line side.

4. The control valve of claim 3,

an extension line of a port center line of the inlet port is set to pass through the valve chamber-side opening of the valve hole.

5. The control valve of claim 4,

an extension of the port centerline of the inlet port is also set toward the outlet port.

6. The control valve according to any one of claims 3 to 5,

the valve unit is configured such that the pressure sensing rod is supported by the support hole,

the pressure sensing lever includes a large diameter portion slidably supported by the support hole, a small diameter portion formed to be smaller than the diameter of the large diameter portion, inserted into the valve hole, and connected to the valve portion, and a tapered portion provided between the large diameter portion and the small diameter portion and having an outer peripheral surface whose diameter is gradually reduced,

an angle of the outer peripheral surface of the taper to an orthogonal face orthogonal to the centerline is equal to or greater than an angle of a port centerline of the inlet port to the orthogonal face.

7. The control valve according to claim 1 or 2,

the valve body has a partition wall that partitions the valve chamber and is formed with the support hole,

the inlet port extends to the valve chamber and opens into the valve chamber,

the partition wall has a tapered portion that is provided so as to face an opening of the valve chamber of the inlet port and that gradually decreases in diameter toward the valve hole, the tapered portion constituting the inclined portion of the connection path on the inlet port side of the valve hole,

the tapered portion guides the refrigerant, which flows into the discharge chamber of the valve chamber from the inlet port, to the valve hole.

8. The control valve of claim 7,

the connection path is formed closer to the inlet port side than the valve hole in the valve chamber by the tapered portion and an inner peripheral surface of the valve chamber, and the connection path is inclined so as to approach the valve hole from the outer peripheral surface side toward the center line side.

9. The control valve according to claim 7 or 8,

the taper portion extends to be provided in the vicinity of the valve hole.

10. The control valve according to any one of claims 7 to 9,

the dividing wall is formed separately from the valve body,

the partition wall is configured to be fitted into a fitting hole formed in the valve body, the valve hole opens to a bottom surface of the fitting hole, and the partition wall partitions the valve chamber on the bottom surface side of the fitting hole.

11. A variable capacity compressor, comprising:

a suction chamber into which a refrigerant before compression is introduced;

a compression unit that compresses the refrigerant in the suction chamber;

a discharge chamber for discharging the compressed refrigerant compressed by the compression unit;

a pressure control chamber that changes a state of the compression portion according to an internal pressure to change a discharge capacity; and

a control valve as claimed in any one of claims 1 to 10.