Volume control valve

Abstract

The present application provides a kind of capacity control valve with the fluid discharge function when starting and high operating efficiency.One kind of capacity control valve (V1) has the valve housing (10);Main valve (50) is constituted by valve core (51) and main valve seat (10a), valve core (51) is driven by solenoid (80), main valve seat (10a) is arranged between discharge port (12) and control port (14), and can be contacted by valve core (51);And pressure sensitive valve component (52) is configured with pressure sensitive body (60) arranged in pressure sensitive chamber (40) to form pressure sensitive valve (53), by the opening and closing of pressure sensitive valve (53), control port (14) and suction inlet (13) can be communicated through intermediate communication path (55), wherein, relative sliding valve core (90) is arranged relative to pressure sensitive valve component (52) to open and close through hole (52d) communicated with intermediate communication path (55), sliding valve core (90) divides pressure sensitive chamber (40) into Pd side space (S1) and Pc side space (S2), and Pd-Pc flow path (90b) is formed on the sliding valve core (90) and communicated with the two spaces (S1, S2).

Description

Technical Field

[0001] This invention relates to a capacity control valve for variable control of the volume of a working fluid, for example, to a capacity control valve for controlling the discharge volume of a variable capacity compressor used in an automotive air conditioning system based on pressure. Background Technology

[0002] Variable capacity compressors used in air conditioning systems of automobiles and other vehicles include: a rotating shaft driven by an engine, a swashplate connected to the rotating shaft at a variable angle, and a compression piston connected to the swashplate. The amount of fluid discharged is controlled by changing the stroke of the piston through altering the swashplate's tilt angle. A capacity control valve, driven by electromagnetic force, controls the pressure within the control chamber by utilizing the suction pressure Ps of the suction chamber (for drawing in fluid), the discharge pressure Pd of the discharge chamber (for discharging fluid pressurized by the piston), and the control pressure Pc of the control chamber housing the swashplate. This allows for continuous change of the swashplate's tilt angle.

[0003] During continuous operation of the variable capacity compressor, the capacity control valve performs the following normal control: the control computer is energized, and the valve core moves axially by the electromagnetic force generated by the solenoid. This opens and closes the main valve located between the discharge port through which the discharge fluid with discharge pressure Pd passes and the control port through which the control fluid with control pressure Pc passes, thereby adjusting the control pressure Pc of the control chamber of the variable capacity compressor.

[0004] During normal operation of the capacity control valve, the pressure in the control chamber of the variable capacity compressor is appropriately controlled, and the piston stroke is altered by continuously changing the tilt angle of the swashplate relative to the rotating shaft to control the fluid discharge rate relative to the discharge chamber, thereby adjusting the air conditioning system to the target cooling capacity. Furthermore, when driving the variable capacity compressor at maximum capacity, the pressure in the control chamber is reduced by closing the main valve of the capacity control valve, maximizing the tilt angle of the swashplate.

[0005] In addition, a capacity control valve is known to have an auxiliary connection path that connects the control port and the suction port of the capacity control valve. During startup, the refrigerant in the control chamber of the variable capacity compressor is discharged into the suction chamber of the variable capacity compressor through the control port, the auxiliary connection path, and the suction port, so as to rapidly reduce the pressure in the control chamber during startup, thereby improving the responsiveness of the variable capacity compressor (see Patent Document 1).

[0006] Existing technical documents

[0007] Patent documents

[0008] Patent Document 1: Japanese Patent No. 5167121 (page 7) Figure 2) Summary of the Invention

[0009] The problem that the invention aims to solve

[0010] However, in Patent Document 1, although the fluid discharge function is excellent during startup, the auxiliary connection is connected during continuous operation of the variable capacity compressor, and the refrigerant flows from the control port into the suction port. Therefore, the refrigerant circulation volume is large, and the operating efficiency of the variable capacity compressor may be reduced.

[0011] This invention was made in view of the problem that it aims to provide a capacity control valve with a fluid discharge function during startup and high operating efficiency.

[0012] Methods for solving problems

[0013] To solve the above-mentioned problems, the capacity control valve of the present invention comprises:

[0014] The valve body has an outlet for a discharge fluid having a discharge pressure, an inlet for a suction fluid having a suction pressure, and a control port for a control fluid having a control pressure.

[0015] The main valve consists of a valve core and a main valve seat. The valve core is driven by a solenoid, and the main valve seat is located between the outlet and the control port and is able to contact the valve core.

[0016] Pressure-sensitive element, which is disposed in pressure-sensitive chamber; and

[0017] A pressure-sensitive valve component, extending from the valve core to the pressure-sensitive chamber, together with the pressure-sensitive body, constitutes a pressure-sensitive valve.

[0018] An intermediate connecting path is formed on the valve core and the pressure-sensitive valve component, allowing the control port and the suction port to be connected through the intermediate connecting path by opening and closing the pressure-sensitive valve.

[0019] The pressure-sensitive valve component has a through hole communicating with the intermediate communication path, and a sliding valve core is provided. The sliding valve core slides relative to the pressure-sensitive valve component in the pressure-sensitive chamber to open and close the through hole.

[0020] The sliding valve core divides the pressure-sensitive chamber into a Pd-side space on the outlet side and a Pc-side space on the control port side, and a Pd-Pc flow path connecting these two spaces is formed on the sliding valve core.

[0021] Therefore, by dividing the pressure-sensitive chamber into a Pd-side space communicating with the discharge port and a Pc-side space communicating with the control port through the sliding valve core, when the main valve is controlled under energized conditions, the fluid flowing from the discharge port to the control port through the openings and slits formed on the sliding valve core in the Pd-Pc flow path can be supplied. The force of this fluid causes the sliding valve core to slide towards the control port side, closing the through-hole of the pressure-sensitive valve component and isolating the control port from the suction port, thereby preventing fluid from flowing from the control port into the suction port. On the other hand, when the main valve is closed during startup, the differential pressure generated between the Pd-side and Pc-side spaces by the high-pressure fluid flowing from outside the capacity control valve into the Pc-side space of the pressure-sensitive chamber through the control port causes the sliding valve core to slide towards the discharge port side, opening the through-hole of the pressure-sensitive valve component and communicating with the suction port, thereby rapidly reducing the control pressure. This improves the discharge and operating efficiency of the liquid refrigerant during startup of the variable capacity compressor.

[0022] Alternatively, the sliding valve core can slide along the outer peripheral surface of the pressure-sensitive valve component.

[0023] Therefore, by sliding along the pressure-sensitive valve component, the through hole can be reliably sealed.

[0024] Alternatively, the Pd-Pc flow route can be formed by a connecting hole that passes through the sliding valve core along the axial direction.

[0025] Therefore, the leakage of fluid through the Pd-Pc flow path of the sliding valve core can be easily adjusted according to the number and size of the connecting holes, which can improve the operating accuracy of the sliding valve core.

[0026] Alternatively, multiple Pd-Pc flow paths may be configured at equal intervals along the circumference.

[0027] Therefore, the sliding valve core can evenly bear the force generated by the fluid, thus enabling the sliding valve core to operate stably.

[0028] Alternatively, a protrusion may be provided between the sliding valve core and the flange portion, wherein the flange portion is formed on the front end side of the pressure-sensitive valve component, which is further from the through hole.

[0029] Therefore, when the through hole of the pressure-sensitive valve component is closed by the sliding valve core, the protrusion can prevent the surface of the side of the sliding valve core from abutting against the side of the flange of the pressure-sensitive valve component, thus making it easier for the sliding valve core to separate from the pressure-sensitive valve component and improving the responsiveness of the sliding valve core.

[0030] Alternatively, a protrusion protruding toward the flange portion may be provided on the sliding valve core.

[0031] Therefore, with the through hole of the pressure-sensitive valve component closed by the sliding valve core, a large pressure-bearing area can be ensured by the side facing the Pc side space, making it easy to use differential pressure to make the sliding valve core move in the opening direction.

[0032] Alternatively, a stop is provided on the valve housing to restrict the movement of the sliding valve core in the opening direction.

[0033] Therefore, the movement of the sliding valve core can be limited by the stop element, thus the controllability of the sliding valve core is high. Attached Figure Description

[0034] Figure 1 This is a schematic diagram showing the structure of a swashplate variable capacity compressor assembled with the capacity control valve of Embodiment 1 of the present invention;

[0035] Figure 2 This is a cross-sectional view showing the main valve being open and the through-hole of the pressure-sensitive valve component being closed by the sliding valve core in the non-energized state of the capacity control valve of Embodiment 1.

[0036] Figure 3 yes Figure 2 Enlarged sectional view;

[0037] Figure 4 This is an enlarged cross-sectional view showing the situation immediately after the main valve is closed when the capacity control valve and variable capacity compressor of Embodiment 1 are started (in the energized state), that is, when the sliding valve core and pressure-sensitive valve components move together from the position before starting to the pressure-sensitive body side.

[0038] Figure 5 This illustrates that during startup (in the energized state) of the capacity control valve and variable capacity compressor in Embodiment 1, the sliding valve core moves from... Figure 4 An enlarged cross-sectional view of the situation where the pressure-sensitive valve component opens its through hole as it moves toward the solenoid side;

[0039] Figure 6 This is a side view showing the structure of the sliding valve core of Embodiment 1;

[0040] Figure 7 This is a side view showing a modified example of the sliding valve core of Embodiment 1;

[0041] Figure 8 This is an enlarged cross-sectional view showing the situation where the main valve is open and the through hole of the pressure-sensitive valve component is closed by the sliding valve core in the non-energized state of the capacity control valve of Embodiment 2 of the present invention.

[0042] Figure 9 This is an enlarged cross-sectional view showing the situation where the main valve is open and the through hole of the pressure-sensitive valve component is closed by the sliding valve core in the non-energized state of the capacity control valve of Embodiment 3 of the present invention.

[0043] Figure 10 This is an enlarged cross-sectional view showing the situation where the main valve is open and the through hole of the pressure-sensitive valve component is closed by the sliding valve core in the non-energized state of the capacity control valve of Embodiment 4 of the present invention. Detailed Implementation

[0044] Hereinafter, the method of implementing the capacity control valve of the present invention will be described with reference to embodiments.

[0045] Example 1

[0046] Reference Figures 1 to 6 The capacity control valve of Example 1 will be described below. Figure 2 The left and right sides when viewed from the front side are described as the left and right sides of the capacity control valve. Specifically, the left side of the paper where the pressure-sensitive element 60 is located is described as the left side of the capacity control valve, and the right side of the paper where the solenoid 80 is located is described as the right side of the capacity control valve.

[0047] The capacity control valve V1 of the present invention is assembled in a variable capacity compressor M used in an air conditioning system of automobiles, etc., and performs variable control on the pressure of the refrigerant, i.e., the working fluid (hereinafter referred to as "fluid"), thereby controlling the discharge of the variable capacity compressor M and adjusting the air conditioning system to the target cooling capacity.

[0048] First, let's explain the variable capacity compressor M. For example... Figure 1 As shown, the variable capacity compressor M has a housing 1, which includes a discharge chamber 2, a suction chamber 3, a control chamber 4, and multiple cylinders 4a. Additionally, the variable capacity compressor M has a connection path (not shown) that directly connects the control chamber 4 and the suction chamber 3, and this connection path includes a fixed throttling orifice for balancing the pressure between the suction chamber 3 and the control chamber 4.

[0049] Furthermore, the variable capacity compressor M includes: a rotating shaft 5, which is driven to rotate by an engine (not shown) located outside the housing 1; a swashplate 6, which is tiltably connected to the rotating shaft 5 via a hinge mechanism 8 within the control chamber 4; and a plurality of pistons 7, which are connected to the swashplate 6 and are freely fitted into each cylinder 4a for reciprocating movement. A capacity control valve V1, driven by electromagnetic force, is used to continuously change the tilt angle of the swashplate 6 by appropriately controlling the pressure within the control chamber 4, which houses the swashplate 6, by utilizing the suction pressure Ps of the suction chamber 3 (for drawing in fluid), the discharge pressure Pd of the discharge chamber 2 (for discharging fluid pressurized by the piston 7), and the control pressure Pc of the control chamber 4. This changes the stroke of the piston 7 to control the fluid discharge rate. Additionally, for ease of explanation, in Figure 1 The diagram of the capacity control valve V1 assembled in the variable capacity compressor M is omitted.

[0050] Specifically, the higher the control pressure Pc in control chamber 4, the smaller the tilt angle of the swashplate 6 relative to the rotation axis 5, and the less the stroke of the piston 7. However, when the pressure reaches a certain level, the swashplate 6 becomes approximately perpendicular to the rotation axis 5, i.e., slightly tilted compared to being perpendicular. At this point, the stroke of the piston 7 is minimized, the pressure exerted by the piston 7 on the fluid in cylinder 4a is minimized, thus reducing the amount of fluid discharged to discharge chamber 2, and minimizing the cooling capacity of the air conditioning system. On the other hand, the lower the control pressure Pc in control chamber 4, the larger the tilt angle of the swashplate 6 relative to the rotation axis 5, and the more the stroke of the piston 7. However, when the pressure falls below a certain level, the swashplate 6 reaches its maximum tilt angle relative to the rotation axis 5. At this point, the stroke of the piston 7 is maximized, the pressure exerted by the piston 7 on the fluid in cylinder 4a is maximized, thus increasing the amount of fluid discharged to discharge chamber 2, and maximizing the cooling capacity of the air conditioning system.

[0051] like Figure 2 As shown, the capacity control valve V1 assembled in the variable capacity compressor M adjusts the current energized to the coil 86 constituting the solenoid 80 to control the opening and closing of the main valve 50 and the auxiliary valve 54 in the capacity control valve V1, and controls the opening and closing of the pressure-sensitive valve 53 by the suction pressure Ps, thereby controlling the fluid flowing into or out of the control chamber 4, and thus variably controlling the control pressure Pc in the control chamber 4.

[0052] In this embodiment, the main valve 50 consists of a main and auxiliary valve core 51 serving as the valve core and a main valve seat 10a formed on an annular protrusion 10c, which is isosceles trapezoidal in cross-section and protrudes from the inner circumference of the valve housing 10 towards the inner diameter side. The main valve 50 is opened and closed by contacting or separating from the main valve seat 10a through the axial left end face 51a of the main and auxiliary valve core 51. The auxiliary valve 54 consists of a main and auxiliary valve core 51 and an auxiliary valve seat 82a formed on the open end face of the fixed iron core 82, i.e., the axial left end face of the fixed iron core 82. The auxiliary valve 54 is opened and closed by contacting or separating from the auxiliary valve seat 82a through the axial right step portion 51b of the main and auxiliary valve core 51. The pressure-sensitive valve 53 is composed of a connector 70 of the pressure-sensitive body 60 and a pressure-sensitive valve seat 52a formed on the axial left end face of the pressure-sensitive valve component 52. The pressure-sensitive valve 53 is opened and closed by contacting or separating from the pressure-sensitive valve seat 52a through the axial right end face 70a of the connector 70.

[0053] Next, the structure of the capacity control valve V1 will be described. For example... Figure 2As shown, the capacity control valve V1 mainly consists of the following parts: a valve body 10, which is formed of metal or resin material; main and auxiliary valve cores 51 and pressure-sensitive valve components 52, which are axially reciprocating freely within the valve body 10; a pressure-sensitive body 60, which applies an axial force to the main and auxiliary valve cores 51 and pressure-sensitive valve components 52 according to the suction pressure Ps; a solenoid 80, which is connected to the valve body 10 and applies a driving force to the main and auxiliary valve cores 51 and pressure-sensitive valve components 52; and a sliding valve core 90, which is configured to reciprocate axially relative to the pressure-sensitive valve components 52 by the opening and closing of the main valve 50. The sliding valve core 90 opens and closes the flow path between the secondary valve chamber 30, which becomes the suction pressure Ps, and the pressure-sensitive chamber 40, which becomes the control pressure Pc, by its reciprocating movement. Therefore, it can also be said that it, together with the pressure-sensitive valve component 52, constitutes a CS valve that rapidly releases the control pressure Pc of the control chamber 4 to the suction chamber 3 through the through hole 52d and the intermediate connecting passage 55 of the pressure-sensitive valve component 52 (described later).

[0054] like Figure 2 As shown, the solenoid 80 mainly consists of the following parts: a housing 81 having an opening 81a that opens axially to the left; a generally cylindrical fixed iron core 82 that is inserted into the opening 81a of the housing 81 from the axial left and fixed to the inner diameter side of the housing 81; a drive rod 83 that can move freely axially back and forth on the inner diameter side of the fixed iron core 82, and its axial left end is connected and fixed to the main and auxiliary valve cores 51; a movable iron core 84 that is fixed to the axial right end of the drive rod 83; a helical spring 85 that is disposed between the fixed iron core 82 and the movable iron core 84 and applies force to the movable iron core 84 axially to the right; and an excitation coil 86 that is wound around the outside of the fixed iron core 82 via a winding frame.

[0055] On the outer casing 81, a recess 81b is formed on the inner diameter side on the left side of the axial direction, which is recessed to the right side of the axial direction. The right end of the valve housing 10 is inserted and fixed in the recess 81b in a generally sealed manner.

[0056] The fixed iron core 82 is formed of a rigid body made of magnetic materials such as iron and silicon steel, and has a cylindrical portion 82b extending axially and having an insertion hole 82c for the drive rod 83 to be inserted, and an annular flange portion 82d extending from the outer peripheral surface of the axial left end of the cylindrical portion 82b in the outward diameter direction. Furthermore, a recess 82e is formed on the inner diameter side of the axial left side of the cylindrical portion 82b, which is recessed to the axial right.

[0057] like Figure 2 As shown, the valve housing 10 has the following: a Pd port 12 as a discharge port, which communicates with the discharge chamber 2 of the variable capacity compressor M; a Ps port 13 as a suction port, which communicates with the suction chamber 3 of the variable capacity compressor M; and a Pc port 14 as a control port, which communicates with the control chamber 4 of the variable capacity compressor M.

[0058] The valve housing 10 is generally cylindrical with a bottom by being pressed into the separation adjustment member 11 in a generally sealing manner at its axial left end. In addition, the separation adjustment member 11 can adjust the force of the pressure-sensitive body 60 by adjusting the axial position of the valve housing 10.

[0059] The valve housing 10 contains: a main valve chamber 20, which is connected to the Pd port 12 and has the axial left end face 51a side of the main and auxiliary valve cores 51 disposed thereon; an auxiliary valve chamber 30, which is connected to the Ps port 13 and has the back pressure side of the main and auxiliary valve cores 51 disposed thereon, i.e., the axial right step portion 51b of the main and auxiliary valve cores 51 disposed thereon; and a pressure-sensitive chamber 40, which is connected to the Pc port 14 and has the pressure-sensitive valve component 52, the sliding valve core 90 and the pressure-sensitive body 60 disposed thereon.

[0060] Furthermore, inside the valve housing 10, a main and auxiliary valve core 51 and a pressure-sensitive valve component 52 are arbitrarily arranged to reciprocate axially. A small-diameter guide hole 10b is formed on the inner circumferential surface of the valve housing 10 at its right axial end, allowing the outer circumferential surfaces of the main and auxiliary valve cores 51 to slide in a substantially sealed state. Furthermore, inside the valve housing 10, the main valve chamber 20 and the auxiliary valve chamber 30 are separated by the outer circumferential surfaces of the main and auxiliary valve cores 51 and the inner circumferential surface of the guide hole 10b. Additionally, a small gap is formed between the inner circumferential surface of the guide hole 10b and the outer circumferential surface of the main and auxiliary valve cores 51, which are slightly separated radially, allowing the main and auxiliary valve cores 51 to move smoothly relative to the valve housing 10 axially.

[0061] like Figure 2 As shown, the pressure-sensitive body 60 is mainly composed of a bellows core 61 with a built-in helical spring 62 and a connector 70 provided on the axial right end of the bellows core 61. The axial left end face of the bellows core 61 is fixed on the separation adjustment component 11.

[0062] Furthermore, the pressure-sensitive element 60 is disposed within the pressure-sensitive chamber 40, and the force generated by the coil spring 62 and the bellows core 61 causes the connector 70 to move axially to the right, causing the axially right end face 70a of the connector 70 to sit on the pressure-sensitive valve seat 52a of the pressure-sensitive valve component 52. Additionally, the connector 70 is subjected to a force axially to the left based on the suction pressure Ps in the intermediate connecting passage 55.

[0063] like Figure 2 As shown, the main and auxiliary valve cores 51 are configured in a generally cylindrical shape, and a separate pressure-sensitive valve component 52, which is configured in a cylindrical shape with a flange and is generally shaped like a turret when viewed from the side, is inserted and fixed to its axial left end in a generally sealed manner. A drive rod 83 is inserted and fixed to its axial right end in a generally sealed manner. They can move together axially.

[0064] Furthermore, the labyrinth effect of the annular groove formed on the outer peripheral surface of the main and auxiliary valve cores 51 prevents fluid from leaking from the main valve chamber 20 to the auxiliary valve chamber 30, thus maintaining the discharge pressure Pd of the discharge fluid supplied from the discharge chamber 2 to the main valve chamber 20 via the Pd port 12.

[0065] Furthermore, an intermediate connecting passage 55 is formed inside the main and auxiliary valve cores 51 and the pressure-sensitive valve component 52, extending axially throughout the entire axis through a connecting hollow hole. Additionally, the intermediate connecting passage 55 communicates with the auxiliary valve chamber 30 via a plurality of through holes 51c extending radially at the axial right end of the main and auxiliary valve cores 51.

[0066] like Figures 2 to 5 As shown, the pressure-sensitive valve component 52 is made of metal or resin material, and is configured as a flanged cylindrical shape that is roughly turret-shaped when viewed from the side. It has: a cylindrical base 52b, the right end of which is inserted and fixed to the main and auxiliary valve cores 51 in a generally sealed manner, and a sliding valve core 90 is externally embedded therein; and a flange 52c, which extends from the outer peripheral surface of the left end of the base 52b in the outward diameter direction, and has a pressure-sensitive valve seat 52a that contacts or separates from the right end face 70a of the connector 70. Furthermore, a plurality of through holes 52d are provided on the left end of the base 52b, extending radially and communicating with the intermediate connecting passage 55.

[0067] like Figures 2 to 5 As shown, the sliding valve core 90 is formed from a component different from the pressure-sensitive valve component 52, and is externally embedded in the base 52b of the pressure-sensitive valve component 52, and is configured to have a predetermined thickness dimension L1 in the axial direction (see Figure 52). Figure 3 The sliding valve core 90 has an annular shape. Furthermore, the thickness L1 of the sliding valve core 90 is configured to be larger than the diameter R1 of the through hole 52d of the pressure-sensitive valve component 52 (see reference). Figure 3 (L1>R1).

[0068] In addition, such as Figure 6 As shown, the sliding valve core 90 has a through hole 90a at its center for the base 52b of the pressure-sensitive valve component 52 to pass through, and a plurality of axially penetrating connecting holes 90b are arranged at equal intervals along the circumference on its outer diameter portion, serving as Pd-Pc flow paths. In this embodiment, eight connecting holes 90b of the same diameter are arranged at equal intervals along the circumference on the sliding valve core 90, but this is not a limitation, and the diameter, number, and arrangement of the connecting holes 90b can be freely set.

[0069] In addition, such as Figures 2 to 5As shown, the sliding valve core 90 is configured such that its inner diameter is larger than the outer diameter of the base 52b of the pressure-sensitive valve component 52. The inner circumferential surface of the through hole 90a of the sliding valve core 90 (hereinafter referred to as the "inner circumferential surface of the sliding valve core 90") can slide against the outer circumferential surface 52g of the base 52b of the pressure-sensitive valve component 52. Therefore, the axial reciprocating movement of the sliding valve core 90 is guided by the outer circumferential surface 52g of the base 52b of the pressure-sensitive valve component 52, which can suppress the tilting of the sliding valve core 90. Furthermore, the through hole 52d of the pressure-sensitive valve component 52 can be reliably sealed by the sliding valve core 90.

[0070] Furthermore, the sliding valve core 90 is configured such that its outer diameter is larger than the outer diameter of the flange portion 52c of the pressure-sensitive valve component 52, and the outer peripheral surface 90e of the sliding valve core 90 is positioned close to the inner peripheral surface 10d of the valve housing 10. Specifically, a small gap is formed between the outer peripheral surface 90e of the sliding valve core 90 and the inner peripheral surface 10d of the valve housing 10, which are slightly separated radially, allowing the sliding valve core 90 to move smoothly relative to the valve housing 10 axially. The small gap formed between the outer peripheral surface 90e of the sliding valve core 90 and the inner peripheral surface 10d of the valve housing 10 is larger than the small gap formed between the inner peripheral surface of the sliding valve core 90 and the outer peripheral surface 52g of the base 52b of the pressure-sensitive valve component 52. Furthermore, the connecting hole 90b is formed at a position further outward than the flange portion 52c of the pressure-sensitive valve component 52.

[0071] Furthermore, the sliding valve core 90 divides the pressure-sensitive chamber 40 into a Pd-side space S1, which communicates with the Pd port 12 on the axial right side of the sliding valve core 90, and a Pc-side space S2, which communicates with the Pc port 14 on the axial left side of the sliding valve core 90. The Pd-side space S1 and the Pc-side space S2 are connected by a connecting hole 90b. In addition, between the Pd-side space S1 and the Pc-side space S2, the fluid mainly moves through the connecting hole 90b, and the amount of fluid leakage in the tiny gap between the outer peripheral surface 90e of the sliding valve core 90 and the inner peripheral surface 10d of the valve body 10 is so small that it does not affect the reciprocating action of the sliding valve core 90 as described later.

[0072] Additionally, when the sliding valve core 90 moves axially to the left and closes the through hole 52d of the pressure-sensitive valve component 52 (refer to...) Figures 2 to 4 The axial left side 90c of the sliding valve core 90 abuts against the axial right side 52e of the flange portion 52c of the pressure-sensitive valve component 52. This determines the axial position of the sliding valve core 90 when it closes the through hole 52d of the pressure-sensitive valve component 52.

[0073] Furthermore, when the sliding valve core 90 moves axially to the left and closes the through hole 52d of the pressure-sensitive valve component 52, the portion of the axially left side 90c of the sliding valve core 90 that is further from the outer diameter than the flange portion 52c of the pressure-sensitive valve component 52 is exposed into the Pc-side space S2. On the other hand, regardless of whether the sliding valve core 90 moves or not, the entire axially right side 90d of the sliding valve core 90, from the inner diameter side to the outer diameter side, is exposed into the Pd-side space S1.

[0074] Furthermore, the through hole 52d of the pressure-sensitive valve component 52 is formed further to the right of the axial side 52e than the axial right side of the flange portion 52c. During the period from the state where the sliding valve core 90 abuts against the side 52e of the flange portion 52c of the pressure-sensitive valve component 52 to the axial position of the opening end on the axial left side of the through hole 52d, the sliding valve core 90 overlaps with the through hole 52d in the radial direction, maintaining the closed state of the through hole 52d.

[0075] Next, the operation of the capacity control valve V1 and the operation of the opening and closing mechanism of the through hole 52d of the pressure-sensitive valve component 52, mainly driven by the sliding valve core 90, will be explained in the order of startup and normal control.

[0076] First, the normal control operation will be explained. During normal control, the duty cycle of the capacity control valve V1 is used to adjust the opening degree and opening time of the main valve 50 to control the flow rate of fluid from port Pd 12 to port Pc 14. At this time, the fluid flowing in from port Pd 12 through the opening of the main valve 50 flows to port Pc 14 through the connecting hole 90b of the sliding valve core 90 (in... Figure 3 (Illustrated with solid arrows). The force exerted on the sliding valve core 90 by the fluid, which is received by the side 90d on the axial right side of the sliding valve core 90, causes it to move axially to the left (in... Figure 3 (Illustrated with a white arrow in the middle), the sliding valve core 90 moves axially to the left, and the through hole 52d of the pressure-sensitive valve component 52 is closed (see reference). Figure 3 ).

[0077] At this time, on the sliding valve core 90, facing axially to the left, in addition to the force (F) generated by the fluid flow through the connecting hole 90b caused by the opening of the main valve 50, there is also a force (F) f Furthermore, based on the pressure-bearing surface formed by the axial right side 90d of the sliding valve core 90, a force (F) generated by the pressure of the fluid in the Pd side space S1 of the pressure-sensitive chamber 40 acts on it. P1 Oriented axially to the right, the pressure surface formed by the outer diameter side of the axially left side 90c of the sliding valve core 90 is subjected to a force (F) generated by the pressure of the fluid in the Pc-side space S2 of the pressure-sensitive chamber 40. P2 That is, taking leftward as positive, a force F acts on the sliding valve core 90. sv =Ff +F P1 -F P2 .

[0078] Specifically, in this embodiment, the fluid flowing into the Pd side space S1 is the discharge fluid supplied from the Pd port 12 through the opening of the main valve 50. Compared with the control fluid supplied from the Pc port 14 to the Pc side space S2, the pressure-bearing surface of the sliding valve core 90 on the axial right side 90d, which is acted upon by the pressure of the fluid in the Pc side space S2, is larger than the axial left side 90c of the sliding valve core 90 acted upon by the pressure of the fluid in the Pd side space S1.

[0079] That is, the force (F) generated by the fluid pressure acting axially to the right on the sliding valve core 90. P2 Compared to the force (F) generated by the fluid pressure acting axially to the left on the sliding valve core 90, P1 Larger (F) P1 >F P2 ), through which the force (F) generated by the fluid flow acts to the left along the axis. f The resultant force (F) f +F P1 It can reliably maintain the closed state of the through hole 52d of the pressure-sensitive valve component 52.

[0080] Thus, during normal control, when the sliding valve core 90 closes the through hole 52d of the pressure-sensitive valve component 52, no flow path is formed to the control chamber 4, Pc port 14, pressure-sensitive chamber 40, through hole 52d, intermediate connecting passage 55, auxiliary valve chamber 30, Ps port 13, and suction chamber 3. Therefore, the amount of refrigerant flowing out from the control chamber 4 to the suction chamber 3 is reduced, thereby improving the operating efficiency of the variable capacity compressor M.

[0081] Next, the start-up process will be explained. After the variable-capacity compressor M has been left unused for an extended period, the discharge pressure Pd, control pressure Pc, and suction pressure Ps are approximately balanced. Furthermore, for clarity, illustrations are omitted, but prolonged shutdown of the variable-capacity compressor M may cause liquefaction of the high-pressure fluid in the control chamber 4. In this case, due to the high suction pressure Ps within the intermediate connection 55, the pressure-sensitive element 60 will contract, causing the axial right-side end face 70a of the coupling 70 to separate from the pressure-sensitive valve seat 52a of the pressure-sensitive valve component 52, thereby opening the pressure-sensitive valve 53. Thus, for example, when the suction pressure Ps is high during startup, by opening the pressure-sensitive valve 53, the liquid refrigerant in the control chamber 4 can be discharged into the suction chamber 3 via the intermediate connection 55 within a short time.

[0082] When the capacity control valve V1 is not energized, the movable iron core 84 is pressed axially to the right by the force of the helical spring 85 constituting the solenoid 80, the helical spring 62 constituting the pressure-sensitive body 60, and the bellows core 61. This causes the drive rod 83, the main and auxiliary valve cores 51, and the pressure-sensitive valve component 52 to move axially to the right. The stepped portion 51b on the axial right side of the main and auxiliary valve cores 51 sits on the auxiliary valve seat 82a of the fixed iron core 82, closing the auxiliary valve 54. Furthermore, the axial left end face 51a of the main and auxiliary valve cores 51 separates from the main valve seat 10a formed on the inner circumferential surface of the valve housing 10, opening the main valve 50 (see reference). Figure 2 and Figure 3 At this time, the sliding valve core 90 is located axially to the left due to the force of the fluid generated by the opening of the main valve 50, and the through hole 52d of the pressure-sensitive valve component 52 is closed.

[0083] By starting the variable capacity compressor M and energizing the capacity control valve V1, the electromagnetic force generated by applying current to the solenoid 80 pulls the movable iron core 84 axially to the left towards the fixed iron core 82. The drive rod 83, main and auxiliary valve cores 51, and pressure-sensitive valve assembly 52, all fixed to the movable iron core 84, move axially to the left together. The pressure-sensitive body 60 is pressed and retracted axially to the left, causing the step portion 51b on the axial right side of the main and auxiliary valve cores 51 to separate from the auxiliary valve seat 82a, opening the auxiliary valve 54. The end face 51a on the axial left side of the main and auxiliary valve cores 51 then sits on the main valve seat 10a, closing the main valve 50 (see reference). Figure 4 ).

[0084] In addition, such as Figure 4 As shown, immediately after the main valve 50 closes, although the force (F) generated by the fluid flow acting axially to the left no longer acts on the sliding valve core 90, f However, the sliding valve core 90 will move together with the pressure-sensitive valve component 52 from the position before startup (see reference). Figure 3 The axial left end face 51a of the main and auxiliary valve cores 51 moves axially to the left and sits on the main valve seat 10a, maintaining the closed state of the through hole 52d of the pressure-sensitive valve component 52. In addition, although the sliding valve core 90 lags slightly behind the movement of the pressure-sensitive valve component 52, the sliding valve core 90 will move by inertia and be pressed against the side 52e of the flange portion 52c of the pressure-sensitive valve component 52.

[0085] Additionally, after the variable capacity compressor M is started, the control pressure Pc in the control chamber 4 may increase. In this case, the control fluid with higher control pressure Pc will flow from Pc port 14 into the Pc side space S2 of the pressure-sensitive chamber 40.

[0086] Therefore, a force (F) generated by the fluid pressure is temporarily applied to the sliding valve core 90 in the axial direction to the right. P2The force (F) generated by the fluid pressure acting on the sliding valve core 90 in the axial direction to the left is greater than the force generated by the fluid pressure. P1' ) big (F P1' <F P2 The differential pressure acting on the sides 90c and 90d on both axial sides of the sliding valve core 90 creates a force that causes the sliding valve core 90 to move axially to the right. Figure 5 (Illustrated with a white arrow in the middle), the through hole 52d of the pressure-sensitive valve component 52 is opened (see reference). Figure 5 Thus, even if the through hole 52d of the pressure-sensitive valve component 52 is sealed by the sliding valve core 90 immediately after the main valve 50 is closed, the differential pressure generated between the Pd-side space S1 and the Pc-side space S2 due to the start of the variable capacity compressor M will cause the sliding valve core 90 to move axially to the right, reliably opening the through hole 52d of the pressure-sensitive valve component 52.

[0087] Furthermore, as the sliding valve core 90 moves axially to the right, the fluid in the Pd-side space S1 is compressed. This causes the pressure in the Pd-side space S1 to increase, and the sliding valve core 90 stops at the point where the pressure in the Pd-side space S1 and the pressure in the Pc-side space S2 are balanced. Moreover, during the period when the main valve 50 is closed, the pressure in the Pd-side space S1 and the Pc-side space S2 can be balanced, and the sliding valve core 90 remains stationary. However, when the main valve 50 is opened and the discharged fluid flows into the Pd-side space S1 from the Pd port 12, the pressure in the Pd-side space S1 and the Pc-side space S2 loses its balance, causing the sliding valve core 90 to move axially to the left, and the through-hole 52d of the pressure-sensitive valve component 52 is closed.

[0088] Thus, during startup, when the sliding valve core 90 opens the through hole 52d of the pressure-sensitive valve component 52, the pressure-sensitive chamber 40 connects to the intermediate connecting passage 55 through the through hole 52d, thereby allowing fluid to flow (in... Figure 5 (Illustrated with solid arrows). That is, the sliding valve core 90 opens the through hole 52d of the pressure-sensitive valve component 52, thereby forming a flow path for discharging fluid in the order of control chamber 4, Pc port 14, pressure-sensitive chamber 40, through hole 52d, intermediate connecting passage 55, secondary valve chamber 30, Ps port 13, and suction chamber 3. Therefore, the liquefied fluid in the control chamber 4 can be discharged in a short time, improving the responsiveness during startup. Furthermore, during startup, for example, even if the pressure-sensitive valve 53 does not open due to the suction pressure Ps as described above, the sliding valve core 90 can still form a flow path for discharging fluid from the control chamber 4 to the suction chamber 3 via the intermediate connecting passage 55 by opening the through hole 52d of the pressure-sensitive valve component 52.

[0089] As explained above, the pressure-sensitive chamber 40 is divided into a Pd-side space S1 communicating with the Pd port 12 and a Pc-side space S2 communicating with the Pc port 14 by the sliding valve core 90. During normal control of the capacity control valve V1, fluid flowing from the Pd port 12 to the Pc port 14 through the opening of the main valve 50 can be supplied through the connecting hole 90b formed on the sliding valve core 90. The force of this fluid causes the sliding valve core 90 to move axially to the left, thereby closing the pressure-sensitive valve component 52. When the main valve 50 is closed during startup, and the control pressure Pc in the control chamber 4 increases, the differential pressure generated between the Pd side space S1 and the Pc side space S2 of the pressure-sensitive chamber 40 by the high-pressure fluid flowing from the control chamber 4 of the variable capacity compressor M through the Pc port 14 into the Pc side space S2 of the pressure-sensitive chamber 40 causes the sliding valve core 90 to move axially to the right and open the through hole 52d of the pressure-sensitive valve component 52, thereby improving the operating efficiency of the variable capacity compressor M.

[0090] Furthermore, the sliding valve core 90 slides along the outer peripheral surface 52g of the base 52b of the pressure-sensitive valve component 52, thereby reliably sealing the through hole 52d of the pressure-sensitive valve component 52 using the sliding valve core 90.

[0091] Furthermore, preferably, the base 52b of the sliding valve core 90 and the pressure-sensitive valve component 52 are formed of different materials, which can reduce frictional resistance and allow the sliding valve core 90 to slide smoothly.

[0092] Furthermore, the sliding valve core 90 has a connecting hole 90b that connects the Pd port 12 and the Pc port 14 as a Pd-Pc flow path, and the leakage of fluid can be easily adjusted according to the number and size of the connecting holes 90b, which can improve the operating accuracy of the sliding valve core 90.

[0093] In addition, multiple connecting holes 90b are arranged at equal intervals along the circumference, and the sides 90c and 90d on both sides of the axial direction of the sliding valve core 90 can evenly bear the force generated by the fluid, thus enabling the sliding valve core 90 to operate stably.

[0094] Alternatively, the Pd-Pc flow path connecting Pd port 12 and Pc port 14 can also be, as follows: Figure 7 As shown in the modified example, by making the sliding valve core 190 into a shape with a notch 190b formed on the outer diameter portion of the annular shape, the outer peripheral surface of the sliding valve core 190 and the inner peripheral surface 10d of the valve housing 10 (see reference) Figure 7 The double-dotted lines in the diagram form the Pd-Pc flow path. Furthermore, the shape, number, and configuration of the cut 190b can be freely set. Moreover, the cut structure in this variation can also be applied to the sliding valve cores of the following embodiments 2, 3, and 4.

[0095] Furthermore, the sliding valve core 90 is configured such that its thickness L1 is larger than the diameter R1 of the through hole 52d of the pressure-sensitive valve component 52 (L1 > R1) (see reference). Figure 3 From the state where the left-hand side 90c of the pressure-sensitive valve component 52 abuts against the side 52e of the flange portion 52c of the pressure-sensitive valve component 52, until it slides a predetermined distance to the right, the through hole 52d of the pressure-sensitive valve component 52 can be kept closed. Therefore, even if the sliding valve core 90 slides slightly due to vibration or other disturbances, the through hole 52d of the pressure-sensitive valve component 52 can remain closed. Thus, the capacity control valve V1 has strong anti-interference capability and high control accuracy.

[0096] Furthermore, the sliding valve core 90 can move axially to the right by the differential pressure generated between the Pd side space S1 and the Pc side space S2 during startup. Therefore, it is not necessary to set up a force-applying unit such as a spring in order to open the through hole 52d of the pressure-sensitive valve component 52, which can reduce the number of parts of the capacity control valve V1.

[0097] Furthermore, the pressure-sensitive valve component 52 has multiple through holes 52d, thus ensuring a large flow path cross-sectional area for discharging fluid from the Pc port 14 to the suction chamber 3. Additionally, the multiple through holes 52d are arranged at equal intervals along the circumference, thereby shortening the stroke of the sliding valve core 90.

[0098] Example 2

[0099] Next, refer to Figure 8 The capacity control valve of Example 2 will be described. Furthermore, descriptions of structures identical or repeated in Example 1 will be omitted.

[0100] like Figure 8 As shown, in the capacity control valve V2 of this embodiment 2, the sliding valve core 290 is integrally provided with an annular protrusion 290e that protrudes axially to the left from the inner diameter portion of the side surface 290c on the left side. Furthermore, the protrusion 290e is not limited to being annular; multiple protrusions may be arranged at equal intervals along the circumference. Additionally, the protrusion 290e may be a component that is separate from the sliding valve core 290 and is fixed to the side surface 290c.

[0101] Therefore, when the through hole 52d of the pressure-sensitive valve component 52 is closed by the sliding valve core 290, the front end face of the protrusion 290e abuts against the side surface 52e of the flange portion 52c of the pressure-sensitive valve component 52. This prevents the surface of the axial left side surface 290c of the sliding valve core 290 from abutting against the side surface 52e of the flange portion 52c of the pressure-sensitive valve component 52. As a result, the sliding valve core 290 can be easily separated from the pressure-sensitive valve component 52, thereby improving the responsiveness of the sliding valve core 290.

[0102] Furthermore, by providing a protrusion 290e on the inner diameter side of the sliding valve core 290, when the through hole 52d of the pressure-sensitive valve component 52 is closed by the sliding valve core 290, the pressure-bearing area can be expanded to the inner diameter side by the side surface 290c exposed in the Pc side space S2. Therefore, the sliding valve core 290 can be easily moved in the opening direction by utilizing the differential pressure generated between the Pd side space S1 and the Pc side space S2.

[0103] Example 3

[0104] Reference Figure 9 The capacity control valve of Example 3 will be described. Furthermore, descriptions of structures identical or repeated in Examples 1 and 2 described above will be omitted.

[0105] like Figure 9 As shown, in the capacity control valve V3 of this embodiment 3, the pressure-sensitive valve component 352 is integrally provided with an annular protrusion 352f that protrudes axially to the right from the outer diameter portion of the side surface 352e on the axial right side of the flange portion 352c. Furthermore, the protrusion 352f is not limited to being annular; multiple protrusions may be arranged at equal intervals along the circumference. Additionally, the protrusion 352f may be a component that is separate from the pressure-sensitive valve component 352 and is fixed to the side surface 352e of the flange portion 352c.

[0106] Therefore, when the through hole 52d of the pressure-sensitive valve component 352 is closed by the sliding valve core 90, the front end face of the protrusion 352f abuts against the side 90c on the axial left side of the sliding valve core 90, thereby preventing the side 90c on the axial left side of the sliding valve core 90 from abutting against the side 352e of the flange portion 352c of the pressure-sensitive valve component 352. As a result, the sliding valve core 90 can be easily separated from the pressure-sensitive valve component 352, which improves the responsiveness of the sliding valve core 90.

[0107] Example 4

[0108] Reference Figure 10 The capacity control valve of Example 4 will be described. Furthermore, descriptions of structures that are identical or repetitive with those in Examples 1, 2, and 3 described above will be omitted.

[0109] like Figure 10 As shown, in the capacity control valve V4 of this embodiment 4, an annular stop 400 is fixed on the inner circumferential surface 10d of the valve housing 10 within the pressure-sensitive chamber 40, on the axial right side of the sliding valve core 90. This stop 400 restricts the movement of the sliding valve core 90 in the opening direction, i.e., axially to the right. Furthermore, the stop 400 is not limited to being formed in annular shape; multiple stopes may be arranged at equal intervals along the circumference. Additionally, the stop may also be fixed on the outer circumferential surface 52g of the base 52b of the pressure-sensitive valve component 52.

[0110] Therefore, the amount of axial movement of the sliding valve core 90 to the right when the valve is opened can be limited by the stop 400, thus the controllability of the sliding valve core 90 is high.

[0111] The embodiments of the present invention have been described above with reference to the accompanying drawings. However, the specific structure is not limited to these embodiments. Any changes or additions that do not depart from the spirit of the present invention are also included in the present invention.

[0112] For example, in the above embodiments, the case of the sliding valve core reciprocating relative to the pressure-sensitive valve component along the axial direction has been described, but it is not limited to this. For example, it may also rotate and slide relative to the pressure-sensitive valve component while reciprocating relative to it along the axial direction.

[0113] Furthermore, in the above embodiments, the case where the thickness L1 of the sliding valve core is greater than the diameter R1 of the through hole of the pressure-sensitive valve component (L1>R1) has been described. However, this is not the only possibility. The relationship between the thickness L1 of the sliding valve core and the diameter R1 of the through hole of the pressure-sensitive valve component can also be L1=R1 or L1<R1. That is, the through hole of the pressure-sensitive valve component may not be completely closed by the sliding valve core.

[0114] Furthermore, in the above embodiments, the example of separately constructing the main and auxiliary valve cores and the pressure-sensitive valve components is described, but the two can also be formed as a single unit.

[0115] In addition, the sliding valve core can also be divided into multiple parts in the circumferential direction.

[0116] Furthermore, in the above embodiments, the sliding of the inner circumferential surface of the sliding valve core to the outer circumferential surface of the base of the pressure-sensitive valve component has been described, but this is not a limitation; the sliding of the outer circumferential surface of the sliding valve core to the inner circumferential surface 10d of the valve housing 10 is also permissible. In this case, preferably, the minute gap formed between the outer circumferential surface of the sliding valve core and the inner circumferential surface 10d of the valve housing 10 is smaller than the minute gap formed between the inner circumferential surface of the sliding valve core and the outer circumferential surface of the base of the pressure-sensitive valve component. Moreover, preferably, the sliding valve core is formed of a different material than the valve housing.

[0117] In addition, the pressure-sensitive valve component can also be formed separately as a base and a flange.

[0118] Alternatively, the connecting path and fixed throttling orifice that directly connect the control chamber 4 of the variable capacity compressor M to the suction chamber 3 may not be provided.

[0119] Alternatively, the secondary valve 54 may not be required. The stepped portion 51b on the axial right side of the main and secondary valve cores 51 can simply function as a support component to bear axial loads and does not necessarily need a sealing function.

[0120] Alternatively, the pressure-sensitive chamber 40 may be located on the axial right side of the main valve chamber 20, which is equipped with the solenoid 80, and the auxiliary valve chamber 30 may be located on the axial left side of the main valve chamber 20.

[0121] In addition, the pressure-sensitive body 60 may also be designed without an internal coil spring.

[0122] Alternatively, the opening degree and opening time of the main valve 50 can be adjusted by controlling the duty cycle of the capacity control valve to control the flow rate of fluid from port Pd 12 to port Pc 14, thereby adjusting the axial leftward movement of the sliding valve core. The opening degree of the through-hole 52d of the pressure-sensitive valve component 52 can also be adjusted via the sliding valve core. This allows for the adjustment of the flow rate of fluid from port Pc 14 to port Ps 13.

[0123] Symbol Explanation

[0124] 1: Outer shell; 2: Discharge chamber; 3: Suction chamber; 4: Control chamber; 10: Valve body; 10a: Main valve seat; 10c: Annular protrusion; 11: Separating adjustment component; 12: Pd port (discharge port); 13: Ps port (suction port); 14: Pc port (control port); 20: Main valve chamber; 30: Auxiliary valve chamber; 40: Pressure-sensitive chamber; 50: Main valve; 51: Main and auxiliary valve cores (valve cores); 51c: Through hole; 52: Pressure-sensitive valve component; 52a: Pressure-sensitive valve seat; 52b: Base; 52c: Flange; 52d: Through hole; 52e: Side; 53: Pressure-sensitive valve; 54: Auxiliary valve. Valve; 55: Intermediate connecting path; 60: Pressure-sensitive element; 70: Connector; 70a: Right-side end face of the axial direction; 80: Solenoid; 90: Sliding valve core; 90a: Through hole; 90b: Connecting hole (Pd-Pc flow path); 90c: Side; 90d: Side; 190: Sliding valve core; 190b: Cutout (Pd-Pc flow path); 290: Sliding valve core; 290e: Protrusion; 352: Pressure-sensitive valve component; 352f: Protrusion; 400: Stop; M: Variable capacity compressor; S1: Pd side space; S2: Pc side space; V1~V4: Capacity control valve.

Claims

1. A capacity control valve, comprising: The valve body has an outlet for a discharge fluid having a discharge pressure, an inlet for a suction fluid having a suction pressure, and a control port for a control fluid having a control pressure. The main valve consists of a valve core and a main valve seat. The valve core is driven by a solenoid, and the main valve seat is located between the outlet and the control port and is able to contact the valve core. A pressure-sensitive element, which is disposed in a pressure-sensitive chamber; as well as A pressure-sensitive valve component, extending from the valve core to the pressure-sensitive chamber, together with the pressure-sensitive body, constitutes a pressure-sensitive valve. An intermediate connecting path is formed on the valve core and the pressure-sensitive valve component, allowing the control port and the suction port to be connected through the intermediate connecting path by opening and closing the pressure-sensitive valve. The pressure-sensitive valve component has a through hole communicating with the intermediate communication path, and a sliding valve core is provided. The sliding valve core slides relative to the pressure-sensitive valve component in the pressure-sensitive chamber to open and close the through hole. The sliding valve core divides the pressure-sensitive chamber into a Pd-side space on the outlet side and a Pc-side space on the control port side, and a Pd-Pc flow path connecting these two spaces is formed on the sliding valve core.

2. The capacity control valve according to claim 1, wherein, The sliding valve core slides along the outer peripheral surface of the pressure-sensitive valve component.

3. The capacity control valve according to claim 1 or 2, wherein, The Pd-Pc flow path is formed by a connecting hole that runs axially through the sliding valve core.

4. The capacity control valve according to claim 1 or 2, wherein, The Pd-Pc flow path is configured with multiple lines at equal intervals along the circumference.

5. The capacity control valve according to claim 1 or 2, wherein, A protrusion is provided between the sliding valve core and the flange formed on the pressure-sensitive valve component, the flange being positioned relative to the through hole on the top side of the pressure-sensitive valve component.

6. The capacity control valve according to claim 5, wherein, The sliding valve core is provided with a protrusion that extends toward the flange portion.

7. The capacity control valve according to claim 1 or 2, wherein, A stop is provided on the valve housing to restrict the movement of the sliding valve core in the opening direction.

Images