阅读说明：本技术 螺线管控制阀和包括该螺线管控制阀的可变容量压缩机 (Solenoid control valve and variable capacity compressor including the same ) 是由 田口幸彦 于 2018-03-09 设计创作，主要内容包括：提供一种与以往相比能降低制造成本和管理成本的螺线管控制阀。在螺线管控制阀(300)中,固定铁芯(332)具有：嵌合部(332b1),所述嵌合部(332b1)与形成于螺线管外壳(331)的端面(331d)的嵌合孔(331e)嵌合；以及突出部(332b2),所述突出部(332b2)从螺线管外壳(331)的端面(331d)朝向阀主体(311)突出,并且所述突出部(332b2)具有内部空间。此外,突出部(332b2)的前端侧部位(332b3)与形成于阀主体(311)的嵌合孔(314)嵌合,从而使阀主体(311)与螺线管外壳(331)经由固定铁芯(332)而一体化。固定铁芯(332)的突出部(332b2)的所述内部空间构成对阀芯(341)进行收容的阀室(337)。(Provided is a solenoid control valve which can reduce the manufacturing cost and the management cost compared with the conventional solenoid control valve. In a solenoid control valve (300), a fixed iron core (332) has: a fitting portion (332b1) that fits into a fitting hole (331e) formed in an end surface (331d) of the solenoid case (331); and a protrusion (332b2), the protrusion (332b2) protruding from an end face (331d) of the solenoid case (331) toward the valve main body (311), and the protrusion (332b2) having an internal space. The tip end side portion (332b3) of the protruding portion (332b2) is fitted into a fitting hole (314) formed in the valve main body (311), and the valve main body (311) and the solenoid case (331) are integrated via the fixed iron core (332). The internal space of the protruding portion (332b2) of the fixed iron core (332) constitutes a valve chamber (337) that houses the valve body (341).)

1. A solenoid control valve, comprising:

A valve body formed with a valve hole constituting a part of a fluid passage;

A valve unit having a valve core that opens and closes the valve hole;

A solenoid portion having a fixed iron core, a movable iron core, a coil, and a solenoid case that holds or accommodates the fixed iron core, the movable iron core, and the coil, and that moves the movable iron core toward the fixed iron core by energizing the coil, thereby causing an urging force in a valve closing direction to act on the valve unit; and

A pressure-sensitive device that causes a biasing force in a valve opening direction to act on the valve unit in response to an external pressure,

The fixed iron core has a fitting portion that is fitted with a first fitting hole formed in an end surface of the solenoid case, and a protruding portion that protrudes from the end surface of the solenoid case toward the valve main body and has an internal space,

A tip end side portion of the protrusion is fitted into a second fitting hole formed in the valve main body, so that the valve main body and the solenoid housing are integrated via the fixed core,

The inner space of the protruding portion of the fixed core constitutes a valve chamber that accommodates the valve element or a pressure sensing chamber that the external pressure acts on.

2. The solenoid control valve of claim 1,

The outer diameter of the fitting portion is equal to the outer diameter of the distal end portion of the protruding portion.

3. the solenoid control valve of claim 1 or 2,

the fixed core has a small diameter portion on one end surface side and a large diameter portion on the other end surface side, the small diameter portion is housed in the solenoid case, the large diameter portion has a diameter larger than that of the small diameter portion, a portion of the large diameter portion on the side closer to the small diameter portion constitutes the fitting portion, and a portion of the large diameter portion other than the fitting portion constitutes the protruding portion.

4. The solenoid control valve of any of claims 1 to 3,

The inner space is open at a front end face of the protruding portion,

A first communication hole that communicates the internal space with an outside space of the protruding portion is formed in a portion of the protruding portion other than the leading end side portion.

5. The solenoid control valve of claim 4,

The valve hole is formed at substantially the center of the inner bottom surface of the second fitting hole,

The tip end side portion of the protruding portion is fitted into the second fitting hole so that the tip end surface abuts against the inner bottom surface of the second fitting hole,

The inner space constitutes the valve chamber, and a periphery of the valve hole in the inner bottom surface of the second fitting hole constitutes a valve seat portion of the valve body.

6. The solenoid control valve of claim 5,

The valve main body is formed with a second communication hole communicating the valve hole with an outer space of the valve main body,

The fluid passage is formed by the second communication hole, the valve chamber, and the first communication hole.

7. The solenoid control valve of any of claims 1 to 6,

The solenoid control valve is used in 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 fluid passage constitutes a part of a supply passage that supplies the refrigerant in the discharge chamber to the pressure control chamber, and the external pressure is the pressure of the suction chamber.

8. 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;

a supply passage that supplies the refrigerant in the discharge chamber to the pressure control chamber; and

The solenoid control valve according to claim 7 disposed in the supply passage.

Technical Field

the present invention relates to a solenoid control valve, and more particularly, to a solenoid control valve suitable for a variable displacement compressor and a variable displacement compressor including the same.

background

As an example of such a solenoid 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 (valve housing) 4, the valve body 4 having a valve chamber 3a for accommodating the valve body 3b and a valve seat (valve hole) 3 c; a solenoid portion 2, the solenoid portion 2 being disposed on one side of the valve body 4 and applying an urging force in a valve closing direction to the valve body 3 b; 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 in response to the pressure. The solenoid portion 2 is constituted to include: a coil 2 a; a plunger (movable iron core) 2b, the plunger (movable iron core) 2b being connected to the valve body 3b via the valve rod 5 and the solenoid side rod 5 c; and a center post (fixed iron core) 2c for generating an acting force corresponding to the current value by supplying a current to the coil 2a so that the plunger 2b is attracted toward the center post 2 c.

Disclosure of Invention

Technical problem to be solved by the invention

In the solenoid valve 1 described in patent document 1, an end of the center post 2c is fitted into an end of the valve main body 4 on the solenoid portion 2 side, and a housing member of the solenoid portion 2 is fitted outside. That is, the end portion of the valve main body 4 on the solenoid portion 2 side has a fitting portion of two inner and outer layers (see fig. 1). Therefore, there is a problem that it is not easy to manage the size of the valve body 4 and the manufacturing cost and the management cost become high.

Accordingly, an object of the present invention is to provide a solenoid control valve that can reduce manufacturing costs and management costs compared to conventional solenoid control valves.

technical scheme for solving technical problem

According to one aspect of the present invention, a solenoid control valve includes: a valve body formed with a valve hole constituting a part of a fluid passage; a valve unit having a valve core that opens and closes the valve hole; a solenoid portion having a fixed iron core, a movable iron core, a coil, and a solenoid case that holds or accommodates the fixed iron core, the movable iron core, and the coil, and that moves the movable iron core toward the fixed iron core by energizing the coil, thereby causing an urging force in a valve closing direction to act on the valve unit; and a pressure-sensitive device that causes an urging force in a valve opening direction to act on the valve unit in response to an external pressure. The fixed iron core has a fitting portion that is fitted into a first fitting hole formed in an end surface of the solenoid case, and a protruding portion that protrudes from the end surface of the solenoid case toward the valve main body, and has an internal space, and a tip end side portion of the protruding portion is fitted into a second fitting hole formed in the valve main body, so that the valve main body and the solenoid case are integrated via the fixed iron core. Further, the inner space of the protruding portion of the fixed core constitutes a valve chamber in which the valve body is housed or a pressure sensing chamber in which the external pressure acts.

Effects of the invention

in the solenoid control valve, the fitting portion of the fixed core is fitted into the first fitting hole formed in the end surface of the solenoid housing, and the tip end side portion of the protruding portion of the fixed core is fitted into the second fitting hole formed in the valve body, whereby the valve body and the solenoid housing are integrated via the fixed core. That is, the valve main body is embedded with only the tip side portion of the protruding portion of the fixed core. Therefore, as compared with the conventional art in which the valve body has the fitting portion of the inner and outer layers, the size of the valve body can be easily managed, and the manufacturing cost and the management cost can be reduced. Further, since the inner space of the protruding portion of the fixed core constitutes a valve chamber or the pressure sensing chamber, even in the case where the fixed core has the protruding portion, an increase in the axial length of the solenoid control valve can be suppressed.

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 a configuration of a first embodiment of a control valve (solenoid control valve) used in the variable displacement compressor.

Fig. 3 is a main part view showing a modification of the first embodiment.

fig. 4 is a main part view showing a modification of the first embodiment.

Fig. 5 is a sectional view showing the structure of the second embodiment of the control valve.

Fig. 6 is an enlarged view of a main portion of fig. 5.

Fig. 7 is a sectional view showing the structure of the third embodiment of the control valve.

Fig. 8 is an enlarged view of a main portion of fig. 7.

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. The stroke amount of the piston 136 changes 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, 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. Then, the refrigerant (compressed refrigerant) compressed by the compression unit and discharged into the discharge chamber 142 is guided to the high-pressure side of the refrigerant circuit of the air conditioning system through the discharge passage.

The cylinder head 104 is also provided with a solenoid control valve (hereinafter simply referred to as "control valve") 300. The control valve 300 is disposed in a valve accommodating chamber 104b formed in the cylinder head 104.

the control valve 300 disposed in the valve accommodating chamber 104b 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 the supply amount (i.e., the pressure supply amount) of the discharge refrigerant to the crank chamber 140 by adjusting the 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, four O-rings 300a to 300d are attached to the outer peripheral surface of the control valve 300. The four O-rings 300a to 300d block the interior of the valve housing chamber 104b from the exterior space, and the space outside the control valve 300 in the valve housing chamber 104b is partitioned into a first outside space 104b1, a second outside space 104b2, and a third outside space 104b 3.

The first outer space 104b1 communicates with the discharge chamber 142 via a communication path 104c formed in the cylinder head 104. Therefore, the pressure Pd of the discharge chamber 142 acts on the first outer space 104b 1. 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. Therefore, the pressure Pc of the crank chamber 140 acts on the second outside space 104b 2. The third outer space 104b3 communicates with the suction chamber 141 via a communication path 104e formed in the cylinder head 104. Therefore, the pressure Ps of the suction chamber 141 acts on the third outside space 104b 3.

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. Fig. 2 is a sectional view showing a first embodiment of the control valve 300.

As shown in fig. 2, the control valve 300 includes a valve main body 311, a cover member 312, a pressure-sensitive device 320, a solenoid housing 331, a fixed core 332, a movable core 333, an urging member 334, a housing member 335, a coil assembly 336, and a valve unit 340.

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 (end on the opposite side to the solenoid case 331 side) of the valve main body 311. The cover member 312 forms a pressure sensing chamber 313 in cooperation with a recess 311a formed in one end surface of the valve main body 311. In the present embodiment, the valve main body 311 is formed of a lead-free copper alloy (e.g., C69300), and the lid member 312 is formed of a steel plate. The pressure sensing chamber 313 communicates with the space outside the cover member 312, here, the third outside space 104b3 in which the pressure Ps of the suction chamber 141 acts, via a communication hole 312a formed in the side surface of the cover member 312. That is, the pressure Ps of the suction chamber 141 acts on the pressure sensing chamber 313.

A cylindrical fitting hole 314 is formed in the other end surface (end surface on the solenoid case 331 side) 311b of the valve body 311. Further, the valve main body 311 is formed with: a valve hole 315, the valve hole 315 being opened at a central portion of an inner bottom portion of the fitting hole 314; a first rod insertion hole 316, the first rod insertion hole 316 linearly extending from the valve hole 315 to the pressure sensing chamber 313; and a communication hole 317. The communication hole 317 is formed so that the valve hole 315 communicates with the outer space of the valve main body 311, here, the first outer space 104b1 where the pressure Pd of the discharge chamber 142 acts, one end of the communication hole 317 opens on the inner circumferential surface of the valve hole 315, and the other end of the communication hole 317 opens on the outer circumferential surface of the valve main body 311.

The pressure sensing device 320 is disposed in the pressure sensing chamber 313. The pressure sensing device 320 includes a bellows assembly 321. The bellows assembly 321 includes a bellows 321a having a bellows shape, one end of the bellows 321a being open and the other end being closed, an end member 321b closing one end of the bellows 321a, a stopper member 321c disposed in the bellows 321a to restrict contraction of the bellows 321a, and an urging member (compression coil spring) 321d disposed in the bellows 321a to urge the bellows 321a in a direction of expansion. In the present embodiment, the pressure-sensitive device 320 includes, in addition to the bellows assembly 321, an urging member (compression coil spring) 322, and the urging member 322 is disposed between the end member 321b and the valve body 311 and urges the bellows in a direction to contract.

The inside of the bellows 321a is in a vacuum state, and the bellows 321a 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 321a expands as the pressure in the pressure sensing chamber 313 (i.e., the pressure Ps in the suction chamber 141) decreases.

The solenoid case 331 holds or accommodates the fixed iron core 332, the movable iron core 333, the urging member 334, the accommodating member 335, and the coil assembly 336.

The solenoid case 331 includes: a cylindrical peripheral wall portion 331 a; and an end wall portion 331b fixed to one end (end portion on the valve main body 311 side) of the peripheral wall portion 331 a. In the present embodiment, the peripheral wall portion 331a is formed of a magnetic steel plate, and the end wall portion 331b is formed of a magnetic free-cutting steel.

The fixed core 332 is formed in a lap-step cylindrical shape, and has a small diameter portion 332a on one end surface side and a large diameter portion 332b on the other end surface side, and the diameter of the large diameter portion 332b is larger than that of the small diameter portion 332 a. A second rod insertion hole 332c is formed in the small diameter portion 332a so as to penetrate in the axial direction. The large-diameter portion 332b is formed in a cylindrical shape. In the present embodiment, the fixed core 332 is formed of magnetic free-cutting steel.

a predetermined portion of the large diameter portion 332b on the small diameter portion 332a side is fitted into and fixed to a cylindrical fitting hole 331e formed in an end surface 331d of an end wall portion 331b of the solenoid case 331 (i.e., an end surface on the valve body 331 side), whereby the fixed core 332 is held by the solenoid case 331. In the present embodiment, the predetermined portion of the large diameter portion 332b of the fixed core 332 on the side of the small diameter portion 332a is press-fitted into the fitting hole 331 e. However, the present invention is not limited to this, and the predetermined portion of the large diameter portion 332b of the fixed core 332 may be fitted into the fitting hole 331e and fixed.

The small diameter portion 332a of the fixed core 332 is housed in the solenoid case 331. Further, the large diameter portion 332b of the fixed core 332, excluding the predetermined portion, protrudes from the end surface 331d of the solenoid case 331 on the valve body 331 side toward the valve body 331. That is, the large diameter portion 332b of the fixed core 332 includes: a fitting portion 332b1, the fitting portion 332b1 being fitted into a fitting hole 331e formed in an end surface 331d of the solenoid case 331 on the side of the valve body 311; and a protrusion 332b2, the protrusion 332b2 protruding from the end surface 331d of the solenoid case 331 on the valve main body 311 side toward the valve main body 311. Here, as described above, the large diameter portion 332b is formed in a cylindrical shape. Therefore, the protruding portion 332b2 of the large diameter portion 332b of the fixed core 332 has an inner space that is open at its front end face and has a diameter larger than the diameter of the second rod insertion hole 332c formed in the small diameter portion 332 a.

The tip end side portion 332b3 of the protruding portion 332b2 of the large diameter portion 332b of the fixed core 332 is fitted into and fixed to the fitting hole 314 formed in the other end surface 311b of the valve main body 311. Specifically, the distal end side portion 332b3 of the protruding portion 332b2 of the base end portion 332b of the fixed core 332 is press-fitted into the fitting hole 314 such that the distal end surface abuts against the inner bottom surface of the fitting hole 314. Thus, the valve main body 311 and the solenoid case 331 are integrated via the large-diameter portion 332b of the fixed iron core 332 (the fitting portion 332b1+ the protruding portion 332b 2).

In the present embodiment, the inner space of the protruding portion 332b2 constitutes the valve chamber 337. A communication hole 332b4 is formed in a portion of the projection 332b2 other than the tip end portion 332b3, and the communication hole 332b4 communicates the internal space with the space outside the projection 332b2, in this case, the second external space 104b2 where the pressure Pc of the crank chamber 140 acts. That is, the valve chamber 337 communicates with the second outer space 104b2 via the communication hole 332b 4. The valve chamber 337 also communicates with the first outer space 104b1, which is the outer space of the valve main body 311, via the valve hole 315 and the communication hole 317 formed in the valve main body 311. Therefore, in the present embodiment, the communication hole 317, the valve hole 315, the valve chamber 337, and the communication hole 332b4 form the above-described internal passage of the control valve 300 constituting a part of the supply passage 145.

Here, as described above, in the present embodiment, the distal end side portion 332b3 of the protruding portion 332b2 of the fixed core 332 is press-fitted into the fitting hole 314 formed in the other end surface 311b of the valve body 311. However, the present invention is not limited to this, and the distal end portion 332b3 of the protruding portion 332b2 of the fixed core 332 may be fixed by fitting into the fitting hole 314 formed in the other end face 311b of the valve body 311. For example, the tip end portion 332b3 of the protruding portion 332b2 of the fixed core 332 may be screwed into the fitting hole 314, or the tip end portion 332b3 of the protruding portion 332b2 may be fixed by a rivet or the like after being fitted into the fitting hole 314.

The movable iron core 333 is disposed with a predetermined gap between the movable iron core 333 and the one end surface of the fixed iron core 332. In the present embodiment, the movable iron core 333 is formed of magnetic free-cutting steel, as with the fixed iron core 332.

The biasing member 334 is disposed between the fixed core 332 and the movable core 333, and biases the movable core 333 in a direction away from the one end surface of the fixed core 332. In the present embodiment, a compression coil spring is used as the urging member 334.

The housing member 335 is formed in a bottomed cylindrical shape from a nonmagnetic material, and the opening end side thereof is held by the end wall portion 331b of the solenoid case 331. The housing member 335 houses the small diameter portion 332a of the fixed core 332, the movable core 333, and the biasing member 334 therein. The movable core 333 is slidably provided along the inner peripheral surface of the housing member 335, and is movable in the housing member 335 in a direction of being separated from and contacting the one end surface of the fixed core 332.

Coil assembly 336 includes a solenoid coil (hereinafter simply referred to as "coil") 336a and a plug member 336 b. The coil 336a is covered with resin and is disposed around the housing member 335. In the present embodiment, the coil 336a is housed in a housing space formed inside the peripheral wall 331a of the solenoid case 331. The closing member 336b is a member that closes the other end of the peripheral wall portion 331a of the solenoid case 331, and is formed of, for example, magnetic free-cutting steel. The closing member 336b is disposed around the movable core 333 in the radial direction and is integrated with the coil 336a by resin. In fig. 2, reference numeral 336c denotes a resin portion of the coil assembly 336.

When the coil 336a is energized, the solenoid housing 331, the fixed core 332 (more specifically, the portion of the fixed core 332 other than the protruding portion 332b2), the movable core 333, and the blocking member 336b of the coil assembly 336 form a magnetic path, and an electromagnetic force (magnetic attraction force) is generated that moves the movable core 333 toward the one end surface of the fixed core 332 against the urging force of the urging member 334.

The valve unit 340 includes a spool 341, a first rod 342, and a second rod 343. In the present embodiment, the valve body 341, the first rod 342, and the second rod 343 are integrally formed to constitute the valve unit 340.

The valve body 341 is housed in the valve chamber 337 to open and close the valve hole 315 provided in the inner bottom portion of the fitting hole 314. Specifically, the valve body 341 opens and closes the valve hole 315 by separating and contacting the peripheral edge portion of the end plate on the valve hole 315 side from and to the valve seat portion 338 around the valve hole 315 on the inner bottom surface of the fitting hole 314.

The first rod 342 is slidably inserted through a first rod insertion hole 316 formed in the valve main body 311. One end of the first rod 342 is formed to have a smaller diameter than the valve hole 315, and is coupled to a central portion of the valve body 341 on the valve hole 315 side, and the other end of the first rod 342 is detachably coupled to the end member 321b of the pressure sensing device 320.

The second rod 343 is inserted through a second rod insertion hole 332c formed in the small diameter portion 332a of the fixed core 332 with a gap. One end of the second rod 343 is connected to the end of the valve body 341 on the side opposite to the valve hole 315, and the other end of the second rod 343 is connected to the movable core 333.

Here, as described above, in the pressure-sensitive device 320 (bellows assembly 321), the bellows 321a expands and contracts in response to the pressure of the pressure-sensitive chamber 313, that is, the pressure Ps of the suction chamber 141. When the bellows 321a expands by a predetermined length or more as the pressure Ps of the suction chamber 141 decreases, the end member 321b is coupled to the other end of the first rod 342 of the valve unit 340, and the valve unit 340 is biased in a direction in which the valve body 341 opens the valve hole 315. That is, the pressure sensing device 320 causes the urging force in the valve opening direction to act on the valve unit 340 in response to the external pressure, that is, the pressure Ps of the suction chamber 141.

When the coil 336a is energized as described above, the solenoid case 331, the fixed core 332 (the portion other than the protruding portion 332b2), the movable core 333, and the blocking member 336b of the coil assembly 336 form a magnetic path, and an electromagnetic force (magnetic attraction force) is generated that moves the movable core 333 toward the one end surface of the fixed core 332 against the urging force of the urging member 334. When the movable core 333 moves toward the fixed core 332 by the generated electromagnetic force, the valve unit 340 is biased in a direction in which the valve body 341 closes the valve hole 315. Therefore, in the present embodiment, the solenoid housing 331, the fixed core 332 (the portion other than the protruding portion 332b2), the movable core 333, the coil 336a, and the closing member 336b constitute a "solenoid portion" of the present invention.

Next, an example of an assembly process of the control valve 300 will be described.

First, the distal end side portion 332b3 of the protruding portion 332b2 of the fixed core 332 is press-fitted into the fitting hole 314 formed in the other end surface 311b of the valve body 311. Thereby, the valve body 311 is integrated with the fixed core 332, and the valve chamber 337 is formed by the inner space of the protruding portion 332b 2.

Next, the integrated structure of the valve unit 340 and the movable core 333 is inserted into the second rod insertion hole 332c of the fixed core 332 from the first rod 342 side, and the biasing member 334 is disposed between the fixed core 332 and the movable core 333. Thus, the valve unit 340 is disposed in the above-described integrated structure of the valve body 311 and the fixed core 332. Specifically, the first rod 342 is disposed in the first rod insertion hole 316, the valve body 341 is disposed in the valve chamber 377, and the second rod 343 is disposed in the second rod insertion hole 332 c.

Next, the pressure-sensitive device 320 is disposed in the recess 311a formed in the one end surface of the valve body 311, and the lid member 312 is press-fitted into the one end of the valve body 311. Thereby, the pressure sensing chamber 313 is formed, and the pressure sensing device 320 is disposed in the pressure sensing chamber 313.

Next, the solenoid housing 331 and the accommodating member 335 are integrally disposed with respect to the valve body 311 such that the accommodating member 335 sequentially accommodates (the small diameter portion 332a of) the movable core 333, the biasing member 334, and the fixed core 332.

Next, the predetermined portion (fitting portion 332b1) of the large-diameter portion 332b of the fixed core 332 on the small-diameter portion 332a side is press-fitted into the fitting hole 331e formed in the end surface 331d of the end wall portion 331b of the solenoid case 331. Thereby, the valve main body 311 and the solenoid housing 331 are integrated via the large diameter portion 332b of the fixed core 332.

Next, the coil assembly 336 is disposed such that the coil 336a is housed in the housing space inside the peripheral wall portion 331a of the solenoid case 331, and the closing member 336b is fixed to the other end of the peripheral wall portion 331a of the solenoid case 331 by a rivet or the like.

Then, the four O-rings 300a to 300d are attached to predetermined positions, thereby completing the control valve 300. The four O-rings 300a to 300d may be attached to predetermined positions before the control valve 300 is attached to the variable displacement compressor 100, that is, before the control valve is disposed in the valve accommodating chamber 104 b.

Here, a coating film (plating film) by plating such as zinc plating or a coating film (chemical treatment coating film) by chemical treatment such as black dyeing is preferably formed on the surface of the solenoid case 331 (including the inner peripheral surface of the fitting hole 331e) as a rust-proof coating film. Thus, when the predetermined portion (fitting portion 332b1) on the small diameter portion 332a side of the large diameter portion 332b of the fixed core 332 is press-fitted into the fitting hole 331e formed in the end surface 331d of the end wall portion 331b of the solenoid case 331, that is, when members made of the same metal material are press-fitted to each other, the rust prevention coating is sandwiched therebetween, and therefore, the press-fitting load can be stabilized. In addition to or instead of forming the rust preventive coating on the inner peripheral surface of the fitting hole 331e, the hardness of the material of the fixed core 332 may be different from the hardness of the material of the end wall portion 331b of the solenoid case 331, or the surface shape (surface roughness or the like) of the predetermined portion of the fixed core 332 may be different from the surface shape (surface roughness or the like) of the inner peripheral surface of the fitting hole 331 e. This also stabilizes the press-fitting load.

in the present embodiment, the protruding portion 332b2 of the fixed core 332 (more specifically, the portion of the protruding portion 332b2 other than the tip-side portion 332b3) formed of magnetic free-cutting steel is exposed to the outside. Therefore, the protruding portion 332b2 of the fixed core 332 is subjected to rust prevention treatment mainly for the purpose of rust prevention of the exposed portion of the fixed core 332 between the time when the control valve 300 is mounted on the variable displacement compressor 100. The rust prevention treatment includes coating a rust preventive oil on the protruding portion 332b2 of the fixed core 332, forming a rust preventive coating, and the like. Such rust prevention treatment of the protruding portion 332b2 of the fixed core 332 also contributes to stabilization of the press-fitting load.

Next, the operation of the control valve 300 in the variable displacement compressor 100 will be briefly described.

When the air conditioning system is operated, that is, in the operating state of the variable displacement compressor 100, the amount of energization of the coil 336a is set by a control device (not shown) based on air conditioning settings (vehicle interior set temperature), external environment, and the like. Then, the control valve 300 controls the discharge capacity of the variable capacity compressor 100 by adjusting the opening degree of the valve hole 315 (i.e., the supply passage 145) by (the valve body 341 of) the valve unit 340 so that the pressure Ps of the suction chamber 141 becomes a predetermined value corresponding to the above-described energization amount. Specifically, the control valve 300 operates to autonomously adjust the opening degree of the valve hole 315 (i.e., the supply passage 145) in response to the pressure Ps of the suction chamber 141.

When the operation of the air conditioning system is stopped, that is, when the variable displacement compressor 100 is switched from the operating state to the non-operating state, the control device turns off the energization of the coil 336 a. Then, the biasing member 334 moves the movable core 333 in a direction away from the one end surface of the fixed core 332 by the biasing force, and (the valve body 341 of) the valve unit 340 moves in a direction to open the valve hole 315 with the movement of the movable core 333, thereby maximally opening the valve hole 315 (that is, the supply passage 145). Thereby, the discharge refrigerant is supplied to the crank chamber 140 to increase the pressure in the crank chamber 140, and the discharge capacity of the variable capacity compressor 100 becomes minimum.

In the control valve 300 of the present embodiment, the valve main body 311 and the solenoid housing 331 are integrated via the large diameter portion 332b of the fixed core 332. Specifically, the fitting portion 332b1 of the large diameter portion 332b of the fixed core 332 is press-fitted into the fitting hole 331e formed in the end surface 331d of the end wall portion 331b of the solenoid case 331, and the tip end side portion 332b3 of the protruding portion 332b2 of the large diameter portion 332b of the fixed core 332 is press-fitted into the fitting hole 314 formed in the other end surface 311b of the valve body 311, whereby the valve body 311 and the solenoid case 331 are integrated. That is, only the front end side portion 332b3 of the protruding portion 332b2 of the fixed iron core 332 is fitted into the other end surface 311b of the valve main body 311, and there is no member fitted outside the other end surface 311b of the valve main body 311. Therefore, as compared with the conventional art in which the valve body has the fitting portion of the inner and outer layers, the size of the valve body 311 can be easily managed, and the manufacturing cost and the management cost can be reduced.

The protruding portion 332b2 of the fixed core 332 has the above-described internal space constituting the valve chamber 377. Therefore, by providing the fixed iron core 332 with the protruding portion 332b2, the increase in the axial length of the control valve 300 is suppressed.

In the control valve 300 of the present embodiment, the large diameter portion 332b of the fixed core 332 is formed in a cylindrical shape, and the outer diameter of the fitting portion 332b1 fitted into the fitting hole 331e formed in the end surface 331d of the solenoid case 331 is equal to the outer diameter of the tip end side portion 332b3 of the protruding portion 332b2 fitted into the fitting hole 314 formed in the valve body 311. Therefore, the axial misalignment between the valve body 311 and the solenoid housing 331 can be suppressed, and the control valve 300 can be stably installed in the valve accommodating chamber 104b, for example.

In the control valve 300 of the present embodiment, the distal end surface of the protruding portion 332b2 of the fixed core 332 abuts on the same surface as the valve seat portion 338 that is separated from and in contact with the valve body 341, which is the inner bottom surface of the fitting hole 314. That is, the distance from the valve seat portion 338 to the one end surface of the fixed core 332 is the same as the distance from the distal end surface (the other end surface) to the one end surface of the fixed core 332. Therefore, the variation (tolerance accumulation amount) of the gap between the one end surface of the fixed iron core 332 and the movable iron core 333 is reduced, and as a result, the variation of the urging force in the valve closing direction acting on the valve unit 340 is suppressed.

In general solenoid control valves, the material of the valve body is more expensive than the material of the fixed core, and the workability is inferior. In this regard, in the control valve 300 of the present embodiment, the fixed core 332 includes the protruding portion 332b2, so that the structure (for example, a valve chamber) of the conventional main valve body can be included on the fixed core 332 (the protruding portion 332b2) side. Therefore, the length of the valve body 311 is shortened as compared with the conventional one, and the amount of processing is also reduced, thereby reducing the cost.

In the control valve 300 of the present embodiment, when the coil 336a is energized, the outer peripheral surface of the large diameter portion 332b of the fixed core 332 forms a magnetic transmission surface toward the end wall portion 331b of the solenoid housing 331, so that the magnetic transmission is improved as compared with the conventional one, and the magnetic circuit can be stably formed.

Here, the shape of the large diameter portion 332b of the fixed core 332 is not limited to the shape shown in fig. 2. For example, as shown in fig. 3, a concave portion 332b5 may be formed between the fitting portion 332b1 fitted in the fitting hole 331e and the tip end side portion 332b3 of the protruding portion 332b2 fitted in the fitting hole 314, and a communication hole 332b4 may be formed in the concave portion 332b 5. Thus, the outer peripheral surface of the fitting portion 332b1 and the outer peripheral surface of the distal end portion 332b3 need only be formed (machined) with high accuracy, and it is not necessary to form the entire outer peripheral surface of the large diameter portion 332b with high accuracy. Therefore, reduction in processing cost can be achieved. In addition, although it is preferable that the outer diameter of the fitting portion 332b1 is equal to the outer diameter of the leading end side portion 332b3 of the protruding portion 332b2, the outer diameter of the fitting portion 332b1 may be different from the outer diameter of the leading end side portion 332b3 of the protruding portion 332b 2.

The distal end surface of the protruding portion 332b2 of the fixed core 332 does not necessarily have to abut against the same surface as the valve seat portion 338, and the distal end surface of the protruding portion 332b2 of the fixed core 332 may abut against a surface different from the valve seat portion 338.

Further, most of the pressure sensing chamber 313 may be formed by the cover member 312. In this case, as shown in fig. 4, for example, the lid member 312 is fitted (fitted) into a fitting hole 311c formed in the one end surface of the valve body 311, and an O-ring 300d is attached to the radially outer side of the fitting hole 311 c. Thus, the length of the valve main body 311 is further shortened, and cost reduction can be achieved.

Next, a second embodiment of the control valve 300 will be described with reference to fig. 5 and fig. 6 which is an enlarged view of a main portion of fig. 5. Note that the same reference numerals are given to the same or corresponding elements as those in the first embodiment, and the description thereof will be omitted, and the description will be mainly given of the different configurations of the first embodiment.

As shown in fig. 5 and 6, in the second embodiment, the fitting hole 314 is formed in an annular shape, and the inner space of the protruding portion 332b2 of the fixed core 332 constitutes the first pressure sensing chamber 351 instead of the valve chamber. The first pressure sensing chamber 351 is in communication with the space outside the projection 332b2, here, the space where the pressure Ps of the suction chamber 141 acts (the space corresponding to the third outside space 104b3 in the first embodiment), through the communication hole 332b 4.

In the second embodiment, a second pressure sensing chamber 352 is formed on one end side of the valve main body 311, and the second pressure sensing chamber 352 is closed by the cover member 312 and is disposed in the bellows assembly 321 as a pressure sensing device. The second pressure sensing chamber 352 communicates with a space (a space corresponding to the second outer space 104b2 in the first embodiment) in which the pressure Pc of the crank chamber 140 acts, via a communication hole 311d formed in the side surface of the valve main body 311.

The valve main body 311 is formed with a valve chamber 354, a support hole 355, and a communication hole 356, the valve chamber 354 communicates with the second pressure sensing chamber 352 via a valve hole 353, the support hole 355 is disposed coaxially with the valve hole 353, one end thereof opens to the valve chamber 354, and the other end thereof opens to a central portion of the other end surface 311b, and the communication hole 356 communicates the valve chamber 354 with an outer space of the valve main body 311, which is a space where the pressure of the discharge chamber 142 acts (a space corresponding to the first outer space 104b1 in the first embodiment).

In the second embodiment, the valve unit 360 includes a spool 361, a coupling member 362, and a solenoid rod 363. The spool 361 has: a valve portion 361a which is disposed in the valve chamber 354 and opens and closes the valve hole 353; a shaft portion 361b, the shaft portion 361b being slidably supported by the support hole 355; and a pressure receiving portion 361c that is disposed in the first pressure sensing chamber 351 and receives the pressure of the first pressure sensing chamber 351 (i.e., the pressure Ps of the suction chamber 141). The valve body 361 is formed with an internal passage 361d that penetrates the valve body 361 in the axial direction. One end of the coupling member 362 is detachably coupled to the end member 321b of the bellows assembly 321, and the other end is formed to have a diameter smaller than that of the valve hole 353 and is coupled to an end of the valve body 361 on the valve hole 353 side. The coupling member 362 has an internal passage 362a formed therein, and the internal passage 362a axially penetrates the coupling member 362 and communicates with the internal passage 361d of the valve body 341. As with the second rod 343 in the first embodiment, one end of the solenoid rod 363 is connected to the end of the valve body 361 on the side opposite to the valve hole 353 side, and the other end is connected to the movable core 333.

In the second embodiment, the communication hole 356, the valve chamber 354, the valve hole 353, the second pressure sensing chamber 352, and the communication hole 311d correspond to the internal passage of the control valve 300 constituting a part of the supply passage 145.

Further, in the second embodiment, the pressure receiving area of the bellows assembly 321 in the expansion and contraction direction is set to be substantially the same as the pressure receiving area of the valve body 361 on the valve hole 353 side, and in the second embodiment, the control valve 300 is also operated in the operating state of the variable displacement compressor 100 so as to autonomously adjust the opening degree of the valve hole 353 (that is, the supply passage 145) in response to the pressure of the pressure Ps of the suction chamber 141.

In the second embodiment, the valve body 311 and the solenoid housing 331 are also integrated via the large diameter portion 332b of the fixed iron core 332, and the same effects as those of the first embodiment can be obtained. That is, the manufacturing cost and the management cost can be reduced, the increase in the axial length of the control valve 300 can be suppressed, and the control valve 300 can be stably installed in the valve accommodating chamber 104 b.

Next, a third embodiment of the control valve 300 will be described with reference to fig. 7 and fig. 8, which is an enlarged view of a main portion of fig. 7. Note that the same reference numerals are given to the same or corresponding elements as those in the first embodiment, and the description thereof will be omitted, and the description will be mainly given of the different configurations of the first embodiment.

As shown in fig. 7 and 8, in the third embodiment, the fitting hole 314 formed in the valve body 311 is a lap-step cylindrical hole and includes a large-diameter hole portion 314a and a small-diameter hole portion 314 b. The valve main body 311 is formed with a first valve hole 315, a first rod insertion hole 316, a communication hole 317, and a communication hole 371, the first valve hole 315 being opened in the center of the inner bottom of the small-diameter hole portion 314b, the first rod insertion hole 316 extending linearly from the first valve hole 315 to the pressure sensing chamber 313, the communication hole 317 communicating the first valve hole 315 with a space (a space corresponding to the first outer side space 104b1 in the first embodiment) in which the pressure Pd of the discharge chamber 142 acts, the communication hole 371 being formed in parallel with the first rod insertion hole 316, one end being opened in the peripheral edge of the inner bottom of the small-diameter hole portion 314b, and the other end being opened in the pressure sensing chamber 313. In the third embodiment, the pressure sensing chamber 313 communicates with a space (a space corresponding to the second outer space 104b2 in the first embodiment) in which the pressure Pc of the crank chamber 140 acts, via the communication hole 312a formed in the side surface of the lid member 312, similarly to the second pressure sensing chamber 352 in the second embodiment.

The protruding portion 332b2 of the fixed core 332 has a valve housing hole (internal space) 372, a second valve hole 373, and a communication hole 374, the valve housing hole 372 being open at the front end surface of the protruding portion 332b2, the second valve hole 373 being open at the center of the inner bottom of the valve housing hole 372, and the communication hole 374 communicating the second valve hole 373 with a space (a space corresponding to the third outer space 104b3 in the first embodiment) in which the pressure Ps of the suction chamber 141 acts.

Further, the tip end side portion 332b3 of the protruding portion 332b2 of the fixed core 332 is fitted into the large diameter hole portion 314a, thereby forming a valve chamber 375 formed by the small diameter hole portion 314b and the valve housing hole 372. That is, the valve chamber 375 is defined by the valve receiving hole 372 formed in the protrusion portion 332b2 of the fixed core 332 (the inner space of the protrusion portion 332b 2). Further, the valve chamber 375 communicates with the pressure sensing chamber 313 via the communication hole 371.

the valve body 341 is disposed in the valve chamber 375. More specifically, the valve body 341 is accommodated in the valve accommodating hole 372 in the valve chamber 375. In the present embodiment, the valve body 341 includes: a first valve portion 341a for opening and closing the first valve hole 315 by the first valve portion 341 a; a second valve portion 341b for opening and closing the second valve hole 373 by the second valve portion 341 b; and a partitioning portion 341c provided between the first valve portion 341a and the second valve portion 341 b. The outer peripheral surface of the partitioning portion 341c faces the inner peripheral surface of the valve housing hole 371 with a small gap therebetween, and the partitioning portion 341c partitions the inside of the valve chamber 375 into a first valve chamber 375a on the first valve hole 315 side and a second valve chamber 375b on the second valve hole 373 side. Further, as in the first embodiment, the valve body 341, the first rod 342, and the second rod 343 are integrally formed to constitute the valve unit 340.

In the third embodiment, the above-described internal passage of the control valve 300 constituting a part of the supply passage 145 is formed by the communication hole 317, the first valve hole 315, the valve chamber 375 (first valve chamber 375a), the communication hole 371, the pressure sensing chamber 313, and the communication hole 321 c.

Here, the valve body 341 of the third embodiment is configured to: the second valve portion 341b opens the second valve hole 373 to the maximum when the first valve portion 341a closes the first valve hole 315, and the first valve portion 341a opens the first valve hole 315 to the maximum when the second valve portion 341b closes the second valve hole 373.

Therefore, in the third embodiment, when the first valve portion 341a of the valve body 341 closes the first valve hole 315, a second discharge passage that passes through the control valve 300 is formed as a passage through which the refrigerant in the crank chamber 140 flows (is discharged to) the suction chamber 141, in addition to the discharge passage described above that is formed by the communication passage 101c, the space portion 101d, and the fixed throttle portion 103 c. Specifically, the second discharge passage is formed by the communication passage 104d, the communication passage 101e, the space corresponding to the second outer space 104b2, the communication hole 312a, the pressure sensing chamber 313, the communication hole 371, the first valve chamber 375a, the minute gap between the outer peripheral surface of the partition portion 341c of the valve body 341 and the inner peripheral surface of the valve housing hole 372, the second valve chamber 375b, the second valve hole 373, the communication hole 374, the space corresponding to the third outer space 104b3, and the communication passage 104 e.

When the first valve portion 341a adjusts the opening degree of the first valve hole 315, the second valve portion 341b opens the second valve hole 373. Therefore, the refrigerant flows out from the first valve chamber 375a to the second valve chamber 375b through the small gap between the partition 341c and the inner circumferential surface of the valve accommodating hole 372. However, when the first valve portion 341a opens the first valve hole 315 to the maximum, the second valve portion 341b closes the second valve hole 373, and therefore, the refrigerant does not flow out from the first valve chamber 375a to the second valve chamber 375b through the above-described small gap.

In the third embodiment, the valve body 341 receives the pressure Ps of the suction chamber 141 at the end surface on the second valve hole 373 side and receives the pressure Pc of the crank chamber 140 at the surface on the first valve hole 315 side. However, the pressure receiving area of the pressure Pc in the crank chamber 140 of the valve body 341 defined by the outer diameter of the partition portion 341c is set to be substantially equal to the pressure receiving area in the expansion and contraction direction of the bellows assembly 321. Therefore, the pressure Pc of the crank chamber 140 acting in the opening and closing direction of the valve unit 340 is almost cancelled. The first valve portion 341a receives the pressure Pd of the discharge chamber 142 in the valve opening direction, and the first rod 342 receives the pressure Pd of the discharge chamber 142 in the valve closing direction. Therefore, the pressure Pd of the discharge chamber 142 acting in the opening and closing direction of the valve unit 340 is almost cancelled. Therefore, in the third embodiment, the control valve 300 is also operated to autonomously adjust the opening degree of the first valve hole 315 (i.e., the supply passage 145) in response to the pressure of the pressure Ps of the suction chamber 141 in the operating state of the variable displacement compressor 100.

in the third embodiment, the valve body 311 and the solenoid housing 331 are also integrated via the large diameter portion 332b of the fixed iron core 332, and the same effects as those of the first and second embodiments can be obtained. That is, the manufacturing cost and the management cost can be reduced, the increase in the axial length of the control valve 300 can be suppressed, and the control valve 300 can be stably installed in the valve accommodating chamber 104 b.

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

(symbol description)

100 … variable capacity compressor; 101a … cylinder bore; 111 … sloping plate; 136 … piston; 140 … crank chamber (pressure control chamber); 141 … suction chamber; 142 … discharge chamber; 145 … supply path; 300 … control valve; 311 … valve body; 311d … communicating with the hole; 312 … cover member; 312a … communication holes; 313 … pressure sensing chamber; 314 … fitting holes (second fitting holes); 315 … valve orifice; 316 … first rod insertion hole; 317 … communicating hole (first communicating hole); 320 … pressure sensing means; 321 … bellows assembly; 331 … solenoid housing; 331d … end surface of the solenoid case on the valve body side; 331e … fitting hole (first fitting hole); 332 … securing the core; 332a … small diameter section; 332b … large diameter portion; 332b1 … fitting part; 332b2 … projection; 332b3 … on the tip side of the protruding portion; 332b4 … communication hole (second communication hole); 332c … second rod insertion hole; 336 … a coil assembly; 336a … coil; 337 … valve chamber; 338 … valve seat portion; 341 … a valve core; 351 … a first pressure sensing chamber; 352 … second pressure sensing chamber; 353 … valve hole; 354 … valve chamber; 361 … valve core; 374 … are connected through the hole; 375 … valve chamber.