Volume control valve

Abstract

The present application provides a capacity control valve with fluid discharge function at starting and high operation efficiency. A capacity control valve (V1) comprises a valve housing (10), a main valve (50) composed of a valve core (51) driven by a solenoid (80), and a main valve seat (10a) disposed between a discharge port (12) and a control port (14) and capable of being contacted by the valve core (51), and a pressure-sensitive valve component (52) which, together with a pressure-sensitive body (60) arranged in a pressure-sensitive chamber (40), forms a pressure-sensitive valve (53), and through the opening and closing of the pressure-sensitive valve (53), the control port (14) and the suction port (13) can be communicated through an intermediate communication passage (55), wherein a through hole (52d) communicating with the intermediate communication passage (55) is formed on the pressure-sensitive valve component (52), and an opening and closing component (90) is provided, which is limited by a limiting unit (91, 92) to move relative to the valve housing (10), and relatively slides relative to the pressure-sensitive valve component (52) to open and close the through hole (52d).

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 tilt angle, and a compression piston connected to the swashplate. By changing the tilt angle of the swashplate, the stroke of the piston changes, thereby controlling the fluid discharge rate. 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 variation of the swashplate's tilt angle.

[0003] During continuous operation of the variable capacity compressor, the capacity control valve performs the following normal control: energized by the control computer, the valve core moves axially via the electromagnetic force generated by the solenoid, opening and closing 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 tilt angle of the swashplate relative to the rotating shaft is continuously varied. This changes the piston stroke, thereby controlling the amount of fluid discharged from the discharge chamber and adjusting the air conditioning system to the target cooling capacity. Conversely, when the variable capacity compressor is driven at maximum capacity, the main valve of the capacity control valve is closed to reduce the pressure in the control chamber, maximizing the tilt angle of the swashplate.

[0005] In addition, a capacity control valve is known to form 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 decrease.

[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 driven by a solenoid and a main valve seat disposed between the outlet and the control port and capable of contacting the valve core.

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

[0017] A pressure-sensitive valve component extends from the valve core to the pressure-sensitive chamber and, 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 that communicates with the intermediate connecting path, and is provided with an opening and closing component. The opening and closing component is restricted from moving relative to the valve housing by a limiting unit, and slides relative to the pressure-sensitive valve component to open and close the through hole.

[0020] Therefore, when the main valve is controlled under energized conditions, the opening and closing component, which restricts the movement of the restricted unit relative to the valve housing, slides relative to the pressure-sensitive valve component in the closing direction, thereby closing at least a portion of the through-hole of the pressure-sensitive valve component. This prevents or reduces the inflow of fluid from the control port to the suction port. On the other hand, during startup and when the main valve is closed under maximum energized conditions, the opening and closing component slides relative to the pressure-sensitive valve component in the opening direction, causing the through-hole of the pressure-sensitive valve component to open wider than during normal control. This connects the control port to 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.

[0021] Alternatively, the opening and closing component may have an annular portion that is capable of sliding relative to the pressure-sensitive valve component.

[0022] Therefore, the annular portion is continuous in the circumferential direction, thus enabling the through hole of the pressure-sensitive valve component to be reliably sealed through the annular portion.

[0023] Alternatively, the limiting unit may have an elastic body that limits the movement of the opening and closing component.

[0024] Therefore, the movement of the opening and closing components relative to the valve housing can be limited within a specified range by the elastic deformation of the elastomer, thus preventing damage to the opening and closing components.

[0025] Alternatively, the elastic body may be a pair of springs that push the opening and closing components against each other in the opening and closing directions.

[0026] Therefore, the timing of opening and closing of the through-hole of the pressure-sensitive valve component, which is controlled by the opening and closing components, can be adjusted by the difference in the spring constants of a pair of springs.

[0027] Alternatively, the elastomer presses the opening / closing component toward the flange portion, which is formed on the pressure-sensitive valve component closer to the pressure-sensitive body than the through hole.

[0028] Therefore, the closed position of the opening and closing components can be located, and the through hole of the pressure-sensitive valve component can be closed by the opening and closing components.

[0029] Alternatively, the limiting unit may have a stop that abuts against the opening and closing component.

[0030] Therefore, by changing the contact position of the stop member relative to the opening and closing member, the starting position and opening amount of the opening and closing member relative to the through hole of the pressure-sensitive valve member during the stroke of the valve core and pressure-sensitive valve member can be changed, making these settings easy to perform.

[0031] Alternatively, the limiting unit may limit the movement of the opening and closing component by fixing the opening and closing component relative to the valve housing.

[0032] Therefore, the limiting unit does not require springs or the like, which simplifies the structure.

[0033] Alternatively, the axial dimension of the through hole may be less than or equal to the maximum stroke of the valve core.

[0034] Therefore, by sliding the opening and closing components relative to the pressure-sensitive valve components, the through-hole can be fully opened, thus ensuring a large flow path cross-sectional area. Attached Figure Description

[0035] 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;

[0036] Figure 2 This is a cross-sectional view showing the main valve open and the through hole of the pressure-sensitive valve component closed by the opening and closing component in the non-energized state of the capacity control valve of Embodiment 1.

[0037] Figure 3 yes Figure 2 Enlarged sectional view;

[0038] Figure 4 This is an enlarged cross-sectional view showing the case where the main valve is closed and the opening and closing components move relative to each other to open the through hole of the pressure-sensitive valve component when the capacity control valve of Embodiment 1 is energized.

[0039] Figure 5 This is a cross-sectional view showing the case where the main valve is open and the through hole of the pressure-sensitive valve component is closed by the opening and closing component in the non-energized state of the capacity control valve of Embodiment 2 of the present invention.

[0040] Figure 6 This is a cross-sectional view showing the situation where, in the energized state of the capacity control valve of Embodiment 2, particularly during the initial movement of the main and auxiliary valve cores, the opening and closing component follows the pressure-sensitive valve component and closes the through hole of the pressure-sensitive valve component through the opening and closing component.

[0041] Figure 7 This is an enlarged cross-sectional view showing the case where the main valve is closed and the opening and closing components move relative to each other to open the through hole of the pressure-sensitive valve component when the capacity control valve of Embodiment 2 is energized.

[0042] Figure 8 This is a cross-sectional view showing the case where the main valve is open and the through hole of the pressure-sensitive valve component is closed by the opening and closing component in the non-energized state of the capacity control valve of Embodiment 3 of the present invention.

[0043] Figure 9 This is an enlarged cross-sectional view showing the case where the main valve is closed and the opening and closing components move relative to each other to open the through hole of the pressure-sensitive valve component when the capacity control valve of Embodiment 3 is energized.

[0044] Figure 10 This is a cross-sectional view showing the case where the main valve is open and the through hole of the pressure-sensitive valve component is closed by the opening and closing component in the non-energized state of the capacity control valve of Embodiment 4 of the present invention.

[0045] Figure 11 This is an enlarged cross-sectional view showing the situation where the main valve is closed and the opening and closing components move relative to each other to open the through hole of the pressure-sensitive valve component when the capacity control valve of Embodiment 4 is energized. Detailed Implementation

[0046] Hereinafter, specific embodiments of the capacity control valve of the present invention will be described with reference to examples.

[0047] [Example 1]

[0048] Reference Figures 1 to 4 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.

[0049] 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.

[0050] 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. Furthermore, 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.

[0051] Additionally, 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 multiple pistons 7, which are connected to the swashplate 6 and are freely fitted into each cylinder 4a. A capacity control valve V1, driven by electromagnetic force, is used to appropriately control the pressure within the control chamber 4 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 pistons 7), and the control pressure Pc of the control chamber 4 (which houses the swashplate 6). This allows the tilt angle of the swashplate 6 to continuously change, thereby varying the stroke of the pistons 7 to control the fluid discharge rate. Furthermore, for ease of explanation, in... Figure 1 The diagram of the capacity control valve V1 assembled on the variable capacity compressor M is omitted.

[0052] Specifically, the higher the control pressure Pc in the 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 the cylinder 4a is minimized, and thus, the amount of fluid discharged to the discharge chamber 2 decreases, resulting in the minimum cooling capacity of the air conditioning system. On the other hand, the lower the control pressure Pc in the 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 the cylinder 4a is maximized, and thus, the amount of fluid discharged to the discharge chamber 2 increases, resulting in the maximum cooling capacity of the air conditioning system.

[0053] 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.

[0054] 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.

[0055] Next, the structure of the capacity control valve V1 will be described. For example... Figure 2 As shown, the capacity control valve V1 mainly consists of the following parts: a valve body 10, which is formed of metal or resin material; a main and auxiliary valve core 51 and a pressure-sensitive valve component 52, which are arbitrarily reciprocating within the valve body 10; a pressure-sensitive body 60, which applies an axial force to the main and auxiliary valve core 51 and the pressure-sensitive valve component 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 core 51 and the pressure-sensitive valve component 52; and an opening and closing component 90, which is restricted in its movement relative to the valve body 10 by a first helical spring 91 and a second helical spring 92, which are described later as limiting units. The main and auxiliary valve cores 51 and the pressure-sensitive valve component 52 move axially together with the opening and closing of the main valve 50. The opening and closing component 90 can move axially relative to the pressure-sensitive valve component 52. Through its relative reciprocating movement, it opens and closes the flow path between the auxiliary valve chamber 30, which becomes the suction pressure Ps, and the pressure-sensitive chamber 40, which becomes the control pressure Pc. Therefore, it can also be said that together with the pressure-sensitive valve component 52, it 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).

[0056] like Figure 2As 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.

[0057] A recess 81b is formed on the outer casing 81, which is recessed to the right axially on the inner diameter side on the left axial side. The right end of the valve housing 10 is inserted and fixed in the recess 81b in a generally sealed manner.

[0058] The fixed iron core 82 is formed of a rigid body made of magnetic materials such as iron and silicon steel, and includes: a cylindrical portion 82b, which has an insertion hole 82c extending axially and through which the drive rod 83 is inserted; and an annular flange portion 82d, which extends from the outer peripheral surface of the axial left end of the cylindrical portion 82b in the outward diameter direction, and has a recess 82e formed on the inner diameter side of the axial left side of the cylindrical portion 82b that is recessed to the right axially.

[0059] 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.

[0060] The valve housing 10 is a bottomed, generally cylindrical shape formed by pressing the separation adjustment member 11 into its axial left end in a generally sealed manner. Furthermore, 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.

[0061] Inside the valve housing 10 are formed: a main valve chamber 20, which communicates with the Pd port 12 and is disposed on the left axial end face 51a side of the main and auxiliary valve cores 51; an auxiliary valve chamber 30, which communicates with the Ps port 13 and is disposed on the back pressure side of the main and auxiliary valve cores 51, i.e., the step portion 51b on the right axial side of the main and auxiliary valve cores 51; and a pressure-sensitive chamber 40, which communicates with the Pc port 14 and is disposed on the pressure-sensitive valve component 52, the opening and closing component 90, and the pressure-sensitive body 60.

[0062] 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. On the inner circumferential surface of the valve housing 10, a small-diameter guide hole 10b is formed at the right end of the axial direction, 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.

[0063] 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 located at the axial right end of the bellows core 61. The axial left end face of the bellows core 61 is fixed to the separation adjustment component 11.

[0064] Furthermore, the pressure-sensitive element 60 is disposed within the pressure-sensitive chamber 40. A 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.

[0065] like Figure 2 As shown, the main and auxiliary valve cores 51 are generally cylindrical, and a separate pressure-sensitive valve component 52, which is cylindrical with a flange and roughly turret-shaped 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.

[0066] In addition, the labyrinth effect of the annular groove formed on the outer peripheral surface of the main and auxiliary valve cores 51 can suppress the leakage of fluid 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.

[0067] 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. In addition, 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.

[0068] like Figures 2 to 4As shown, the pressure-sensitive valve component 52 is made of metal or resin material and is configured as a flanged cylindrical shape, 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 has an opening / closing component 90 and a second helical spring 92 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 forms a pressure-sensitive valve seat 52a that contacts or separates from the right end face 70a of the connector 70. In addition, a plurality of through holes 52d are provided at the left end of the base 52b, which are radially through and communicate with the intermediate connecting passage 55.

[0069] like Figures 2 to 4 As shown, the opening / closing member 90 is formed from a component different from the pressure-sensitive valve member 52, and has: a cylindrical base 90a as an annular portion, which is externally fitted into the base 52b of the pressure-sensitive valve member 52; and an annular protrusion 90b, which protrudes from the outer peripheral surface of the axial right end of the base 90a toward the outer diameter side. Furthermore, the protrusion 90b is not limited to being formed in an annular shape, but may also be a plurality of protrusions arranged separately in the circumferential direction.

[0070] Furthermore, the inner peripheral surface of the base 90a of the opening / closing member 90 can slide against the outer peripheral surface of the base 52b of the pressure-sensitive valve member 52. Specifically, a small gap is formed between the inner peripheral surface of the base 90a of the opening / closing member 90 and the outer peripheral surface of the base 52b of the pressure-sensitive valve member 52, which are slightly separated radially, allowing the opening / closing member 90 to move smoothly relative to the pressure-sensitive valve member 52 along the axial direction.

[0071] In addition, the opening and closing component 90 is restricted to move relative to the valve housing 10 by the elastic body of the limiting unit, namely the first helical spring 91 and the second helical spring 92.

[0072] In detail, the first helical spring 91 is externally embedded in the opening and closing member 90. Its axial left end face abuts against the axial right side of the rectangular cross-section annular receiving portion 10d, which protrudes from the inner circumference of the pressure-sensitive chamber 40 of the valve housing 10 towards the inner diameter. Its axial right end face abuts against the axial left side of the protrusion 90b of the opening and closing member 90. Thus, the opening and closing member 90 is forced in the opening direction, i.e., axially to the right, to open the through hole 52d of the pressure-sensitive valve member 52. In addition, the first helical spring 91 is a compression spring, which is composed of a conical helical spring. Therefore, even if the opening and closing member 90 tilts or shifts, or the first helical spring 91 deforms radially, it is not easy to interfere with the internal and external parts of the first helical spring 91, and it can be stably maintained.

[0073] Furthermore, the second helical spring 92 is externally embedded in the base 52b of the pressure-sensitive valve component 52 on the axial right side of the opening / closing component 90. Its axial left end face abuts against the axial right end face 90d of the base 90a of the opening / closing component 90, and the axial right end face of the second helical spring 92 abuts against the inner diameter portion of the axial left end face of the main and auxiliary valve cores 51. Thus, the opening / closing component 90 applies force to the closure direction of the through hole 52d of the pressure-sensitive valve component 52, i.e., axially to the left. Additionally, the second helical spring 92 is a compression spring composed of equidistant helical springs. Thus, the second helical spring 92 is externally embedded in the base 52b of the pressure-sensitive valve component 52 and guided by the base 52b of the pressure-sensitive valve component 52, making radial movement or deformation of the second helical spring 92 less likely.

[0074] The limiting unit in this embodiment 1 is composed of a first helical spring 91 and a second helical spring 92, which act as a pair of springs that push the opening and closing components 90 in the opening and closing directions respectively. Furthermore, the set load of the first helical spring 91 is greater than the maximum spring load of the second helical spring 92.

[0075] Additionally, when the through hole 52d of the pressure-sensitive valve component 52, which is axially moved to the left relative to the opening / closing component 90, is closed (refer to...), Figure 2 and Figure 3 The left-hand end face 90c of the base 90a of the opening / closing member 90 abuts against the right-hand side face 52e of the flange portion 52c of the pressure-sensitive valve member 52. This determines the axial position of the opening / closing member 90 when the through hole 52d of the pressure-sensitive valve member 52 is closed by the opening / closing member 90.

[0076] Furthermore, when the through hole 52d of the pressure-sensitive valve component 52 is closed, the end face 90c of the base 90a of the opening / closing component 90 is pressed towards the side 52e of the flange portion 52c of the pressure-sensitive valve component 52 by the force of the second helical spring 92. At this time, the spring load of the second helical spring 92 acts on the first helical spring 91 through the protrusion 90b of the opening / closing component 90. However, as described above, the set load of the first helical spring 91 is greater than the maximum spring load of the second helical spring 92. Therefore, the first helical spring 91 does not contract and maintains the set length (installation length).

[0077] Furthermore, the through hole 52d of the pressure-sensitive valve component 52 is formed further to the right of the side surface 52e on the axial right side than the flange portion 52c. During the period from the state where the end face 90c of the base 90a of the opening and closing member 90 is pressed on the side surface 52e of the flange portion 52c of the pressure-sensitive valve component 52 to the axial position where it moves relative to the opening end on the axial left side of the through hole 52d, the opening and closing member 90 overlaps with the through hole 52d in the radial direction, which can maintain the through hole 52d in a closed state.

[0078] In addition, such as Figure 3 As shown, the axial dimension L1 of the through hole 52d of the pressure-sensitive valve component 52 is less than the maximum stroke L2 of the main and auxiliary valve cores 51 (L1≤L2).

[0079] 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 performed by the opening and closing component 90, will be explained in the order of normal control and start-up.

[0080] First, the normal control operation will be explained. During normal control, the opening degree and opening time of the main valve 50 are adjusted by controlling the duty cycle of the capacity control valve V1 to control the flow rate of fluid from port Pd 12 to port Pc 14. At this time, relative to the axial reciprocating movement of the main and auxiliary valve cores 51, the first helical spring 91 does not extend or retract, only the second helical spring 92 extends or retracts, thereby restricting the movement of the opening and closing component 90 relative to the valve body 10.

[0081] In detail, during normal control in this embodiment 1, the stroke of the main and auxiliary valve cores 51 used to adjust the opening degree of the main valve 50 is controlled by the duty cycle control of the capacity control valve V1. This is achieved when the end face 90c of the base 90a of the opening / closing component 90 abuts against and is pressed against the side surface 52e of the flange portion 52c of the pressure-sensitive valve component 52 (see reference). Figure 3 Within the range of the axial position of the opening end on the left side of the through hole 52d relative to the axial position, the opening and closing member 90 overlaps with the through hole 52d in the radial direction, thereby maintaining the through hole 52d in a closed state.

[0082] Thus, during normal control, when the opening and closing component 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.

[0083] 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 ease of explanation, illustrations are omitted, but prolonged storage of the variable-capacity compressor M in a stopped state may cause the fluid in the control chamber 4 to liquefy due to high pressure. However, 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 to the suction chamber 3 via the intermediate connection 55 for a short time.

[0084] When the capacity control valve V1 is not energized, the movable iron core 84 is pushed 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 assembly 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 opening and closing component 90 is positioned axially to the left relative to the pressure-sensitive valve component 52 by the force of the second helical spring 92, as described above, and the through hole 52d of the pressure-sensitive valve component 52 is closed.

[0085] 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 fixed to the movable iron core 84, the main and auxiliary valve cores 51, and the pressure-sensitive valve component 52 move axially to the left together. The pressure-sensitive body 60 is pushed axially to the left and retracts. As a result, the step portion 51b on the axial right side of the main and auxiliary valve cores 51 separates 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 sits on the main valve seat 10a, and the main valve 50 is closed (see reference). Figure 4 At this time, relative to the axial leftward movement of the main and auxiliary valve cores 51, the first helical spring 91 does not contract, only the second helical spring 92 contracts. Thus, the opening and closing component 90 is restricted from moving relative to the valve housing 10, and moves relative to the axial rightward movement of the pressure-sensitive valve component 52, and the through hole 52d of the pressure-sensitive valve component 52 is opened.

[0086] Thus, during startup, when the opening / closing component 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, allowing fluid to flow (in... Figure 4 (Indicated by solid arrows in the middle). That is, the opening / closing component 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 control chamber 4 can be discharged in a short time, improving the responsiveness during startup. In addition, during startup, for example, even if the pressure-sensitive valve 53 does not open due to the suction pressure Ps as described above, the opening / closing component 90 can still form a flow path for discharging fluid from control chamber 4 to suction chamber 3 through intermediate connecting passage 55 by opening the through hole 52d of pressure-sensitive valve component 52.

[0087] Furthermore, when the variable capacity compressor M is driven at maximum capacity, by energizing the capacity control valve V1 at its maximum duty cycle, the main valve 50 is closed. This allows the opening / closing component 90 to move axially to the right relative to the pressure-sensitive valve component 52, opening the through-hole 52d of the pressure-sensitive valve component 52 and connecting the Pc port 14 with the Ps port 13. Consequently, the control pressure Pc can be rapidly reduced. Therefore, the piston 7 within the cylinder 4a of the control chamber 4 can be rapidly variable, maintaining maximum capacity and improving operating efficiency.

[0088] In this way, during normal control of the capacity control valve V1, the through hole 52d of the pressure-sensitive valve component 52 is closed. During startup and maximum capacity operation, the operating efficiency of the variable capacity compressor M can be improved by moving the opening and closing component 90 relative to the pressure-sensitive valve component 52 to open the through hole 52d of the pressure-sensitive valve component 52.

[0089] Furthermore, in this embodiment 1, the movement of the opening / closing member 90 relative to the valve housing 10 is limited by the elastic bodies, namely the first helical spring 91 and the second helical spring 92, which serve as limiting units. Thus, for example, in this embodiment 1, the set load of the first helical spring 91 is greater than the maximum spring load of the second helical spring 92. Under normal conditions, the first helical spring 91 will not contract. However, under abnormal conditions, when an excessive force is applied that causes the opening / closing member 90 to move axially to the left, the first helical spring 91 contracts, thereby allowing the opening / closing member 90 to move axially to the left. This limits the movement of the opening / closing member 90 relative to the valve housing 10 within a specified range, thus preventing damage to the opening / closing member 90.

[0090] Furthermore, the limiting unit in this embodiment 1 is composed of a first helical spring 91 and a second helical spring 92, which act as a pair of springs that push the opening and closing member 90 towards each other in the opening and closing directions. Thus, the timing of opening and closing of the through-hole 52d of the pressure-sensitive valve member 52 operated by the opening and closing member 90 can be adjusted by the difference in the spring constants of the first helical spring 91 and the second helical spring 92. A specific example of this will be described in detail in embodiment 2.

[0091] Furthermore, the first helical spring 91, serving as a limiting unit, is composed of a conical helical spring, and the second helical spring 92 is composed of equidistant helical springs externally embedded in the base 52b of the pressure-sensitive valve component 52. This restricts the radial movement of the first helical spring 91 and the second helical spring 92, thereby suppressing the tilting of the opening / closing component 90, which is pushed axially from both sides by the first and second helical springs 91 and 92, allowing the opening / closing component 90 to slide smoothly relative to the pressure-sensitive valve component 52.

[0092] In addition, the opening / closing component 90 and the pressure-sensitive valve component 52 are preferably made of different materials, which can reduce frictional resistance and allow the pressure-sensitive valve component 52 to slide smoothly relative to the opening / closing component 90.

[0093] Furthermore, the end face 90c of the base 90a of the opening / closing member 90 is pressed toward the side 52e of the flange 52c of the pressure-sensitive valve member 52 by the force of the second helical spring 92. Therefore, the closed position of the opening / closing member 90 can be positioned, and the end face 90c of the base 90a of the opening / closing member 90 is prevented from immediately separating from the side 52e of the flange 52c of the pressure-sensitive valve member 52 upon initial movement relative to the pressure-sensitive valve member 52. The opening / closing member 90 ensures the closed state of the through hole 52d of the pressure-sensitive valve member 52.

[0094] Furthermore, the axial dimension L1 of the through hole 52d of the pressure-sensitive valve component 52 is less than or equal to the maximum stroke L2 of the main and auxiliary valve cores 51 (L1≤L2), and the axial dimension from the side 52e of the flange portion 52c of the pressure-sensitive valve component 52 to the opening end on the axial right side of the through hole 52d is configured to be approximately the same as the maximum stroke L2 of the main and auxiliary valve cores 51. Therefore, by moving the opening / closing member 90 relative to the pressure-sensitive valve component 52 axially to the right, the through hole 52d of the pressure-sensitive valve component 52 can be fully opened, thus ensuring a large flow path cross-sectional area for discharging fluid from the Pc port 14 to the suction chamber 3.

[0095] Furthermore, since multiple through holes 52d are formed in the pressure-sensitive valve component 52, a large flow path cross-sectional area for discharging fluid from the Pc port 14 to the suction chamber 3 can be ensured. In addition, the multiple through holes 52d are arranged at equal intervals in the circumferential direction, thereby shortening the relative stroke of the opening and closing component 90 with respect to the pressure-sensitive valve component 52.

[0096] In addition, the opening and closing member 90 has a base 90a, which is an annular portion, that is externally fitted to the base 52b of the pressure-sensitive valve member 52 and can slide relative to it. The base 90a is continuous in the circumferential direction, so the through hole 52d of the pressure-sensitive valve member 52 can be reliably closed through the base 90a.

[0097] Furthermore, in this embodiment 1, when the opening / closing member 90 is in a state where the through hole 52d of the pressure-sensitive valve member 52 is closed, the axially left end of the base 90a extends further axially to the left than the opening end on the axially left side of the through hole 52d of the pressure-sensitive valve member 52. Therefore, from the state where the axially left end face 90c of the base 90a abuts against the side surface 52e of the flange portion 52c of the pressure-sensitive valve member 52 until it slides relative to the right a predetermined distance or more, the through hole 52d of the pressure-sensitive valve member 52 can be kept closed. Therefore, even if the opening / closing member 90 slides slightly due to vibration or other disturbances, the through hole 52d of the pressure-sensitive valve member 52 can still be kept closed. Thus, the capacity control valve V1 has strong anti-interference capability and excellent control accuracy.

[0098] Alternatively, the timing of opening and closing of the through hole 52d of the pressure-sensitive valve component 52 by the opening and closing member 90 can be adjusted by adjusting the axial formation position of the through hole 52d relative to the side surface 52e of the flange portion 52c in the pressure-sensitive valve component 52.

[0099] [Example 2]

[0100] Reference Figures 5 to 7 The capacity control valve of Example 2 will be described. Furthermore, for structures identical to those in Example 1 described above, repeated descriptions will be omitted.

[0101] like Figure 5 As shown, in the capacity control valve V2 of this embodiment 2, when the through hole 52d of the pressure-sensitive valve component 52 is closed, the side 290c of the axial left side of the base 290a separates from the side 52e of the flange portion 52c of the pressure-sensitive valve component 52 and is positioned at the axial position of the opening end of the through hole 52d on the axial left side.

[0102] Furthermore, in this embodiment 2, the spring constant k3 of the elastic body serving as the limiting unit, namely the first helical spring 291, is greater than the spring constant k2 of the elastic body also serving as the limiting unit, namely the second helical spring 292, and is less than the spring constant k1 of the first helical spring 91 in the above embodiment 1 (k1 > k3 > k2). Additionally, the set load of the first helical spring 291 is less than the spring load of the second helical spring 292 when the main valve 50 is open, and the maximum spring load of the first helical spring 291 is greater than the maximum spring load of the second helical spring 292.

[0103] Therefore, during normal control of the capacity control valve V2, especially during the initial movement of the main and auxiliary valve cores 51 from the open position of the main valve 50 to the left axially, the opening / closing component 290 follows the pressure-sensitive valve component 52 by contracting together with the first helical spring 291 and the second helical spring 292. Furthermore, as the main and auxiliary valve cores 51 travel to the left axially, the loads on the first and second helical springs 291 and 292 increase. When the spring load of the first helical spring 291 exceeds the spring load of the second helical spring 292, the first helical spring 291 does not contract, and the movement of the opening / closing component 290 relative to the valve housing 10 begins.

[0104] In detail, during normal control, the stroke of the main and auxiliary valve cores 51, used to adjust the opening of the main valve 50, is controlled by the duty cycle of the capacity control valve V2. This is achieved when the main valve 50 is fully open (refer to...). Figure 5 The opening / closing member 290 moves to a position where the spring load of the first helical spring 291 exceeds the axial position of the spring load of the second helical spring 292. Thus, the opening / closing member 290 overlaps radially with the through hole 52d, maintaining the through hole 52d in a closed state (see reference). Figure 6 ).

[0105] Furthermore, during the start-up and maximum capacity operation of the capacity control valve V2, the spring load of the first helical spring 291 exceeds the spring load of the second helical spring 292 relative to the axial leftward movement of the main and auxiliary valve cores 51. The first helical spring 291 does not contract, only the second helical spring 292 contracts. As a result, the opening and closing component 290 is restricted from moving relative to the valve housing 10 and relative to the pressure-sensitive valve component 52 in the axial rightward movement, and the through hole 52d of the pressure-sensitive valve component 52 is opened.

[0106] In this way, during normal control of the capacity control valve V2, the through hole 52d of the pressure-sensitive valve component 52 is closed. During startup and maximum capacity operation, the operating efficiency of the variable capacity compressor M can be improved by moving the opening and closing component 290 relative to the pressure-sensitive valve component 52 to open the through hole 52d of the pressure-sensitive valve component 52.

[0107] In addition, the first helical spring 291 is made of a conical helical spring and has non-linear characteristics. Therefore, by adjusting the load balance between the first helical spring 291 and the second helical spring 292, which are a pair of springs, the timing of opening and closing of the through hole 52d of the pressure-sensitive valve component 52 by the opening and closing component 290 can be freely adjusted.

[0108] Alternatively, when the through hole 52d of the pressure-sensitive valve component 52 is closed, the opening and closing component 290 can reliably maintain the closed state of the through hole 52d of the pressure-sensitive valve component 52 before sliding relative to the right a predetermined distance or more in the axial direction by abutting the side 290c of the base portion 290a with the side 52e of the flange portion 52c of the pressure-sensitive valve component 52.

[0109] [Example 3]

[0110] Reference Figure 8 and Figure 9 The capacity control valve of Example 3 will be described. Furthermore, for structures identical to those in Example 1 described above, repeated descriptions will be omitted.

[0111] like Figure 8 and Figure 9 As shown, in the capacity control valve V3 of this embodiment 3, when the side of the protrusion 390b on the axial left side abuts against the annular stop 393, which is a limiting unit, pressed into and fixed in the pressure-sensitive chamber 40 of the valve housing 310, the opening and closing member 390 is pressed axially to the left by the elastic body, i.e., the helical spring 392, which is a limiting unit, toward the stop 393, thereby restricting its movement relative to the valve housing 310.

[0112] Furthermore, the protrusion 390b is formed by multiple protrusions arranged at equal intervals along the circumference on the outer periphery of the cylindrical base 390a, which is an annular portion. When the main valve 50 is controlled in the energized state, the opening of the main valve 50 maintains the fluid flow from port Pd 12 to port Pc 14 through the protrusions constituting the protrusion 390b (see reference). Figure 8 In addition, multiple protrusions 390b can be arranged in the circumferential direction, or they can be arranged at unequal intervals.

[0113] Therefore, by changing the contact position of the stop member 393 relative to the opening and closing member 390, the starting position and opening amount of the opening and closing member 390 relative to the through hole 52d of the pressure-sensitive valve member 52 during the stroke of the main and auxiliary valve cores 51 can be changed, making these settings easy to perform.

[0114] In addition, the protrusion 390b of the opening and closing member 390 may also be formed as an annular shape. However, in order to maintain the fluid flow from the Pd port 12 to the Pc port 14, a through hole that passes through the protrusion along the axial direction may be provided on the inner diameter side of the stop member 393.

[0115] [Example 4]

[0116] Reference Figure 10 and Figure 11 The capacity control valve of Example 4 will be described. Furthermore, for structures identical to those in Example 1 described above, repeated descriptions will be omitted.

[0117] like Figure 10 and Figure 11 As shown, in the capacity control valve V4 of this embodiment 4, the opening / closing member 490 has a cylindrical base 490a, which is an annular portion, externally embedded in the base 52b of the pressure-sensitive valve member 52. A groove 490b extending circumferentially is formed on the outer peripheral surface of the base 490a. A generally C-shaped fixing member 493, serving as a limiting unit, is inserted and fixed within the groove 490b. Furthermore, a plurality of through holes 493a extending axially are arranged at equal intervals in the circumferential direction on the fixing member 493. Alternatively, the through holes 493a may be arranged at unequal intervals.

[0118] The opening / closing component 490 is pressed into the pressure-sensitive chamber 40 of the valve housing 410 while the fixing component 493 is inserted and fixed, thereby restricting its movement relative to the valve housing 410.

[0119] Therefore, by fixing the fixing component 493, the movement of the opening and closing component 490 relative to the valve housing 410 is limited, so the limiting unit does not need springs or the like, which simplifies the structure.

[0120] Furthermore, a through hole 493a is formed on the fixing member 493 to connect the Pd port 12 and the Pc port 14. Therefore, when the main valve 50 is controlled in the energized state, the opening of the main valve 50 maintains a fluid flow from the Pd port 12 to the Pc port 14 through the circumferential gap between the two ends of the approximately C-shaped fixing member 493 and through the through hole 493a (see reference). Figure 10 ).

[0121] Furthermore, in this embodiment 4, the case where the opening and closing component 490 is fixed to the valve housing 410 via the fixing component 493 has been described, but it is not limited to this. It is also possible that the outer peripheral surface of the opening and closing component is directly fixed to the inner peripheral surface of the valve housing.

[0122] 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.

[0123] For example, in the above embodiments, the case where the opening and closing component moves reciprocally 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 move reciprocally relative to the pressure-sensitive valve component while rotating and sliding.

[0124] Furthermore, in the above embodiments, the case where the opening and closing component maintains a state in which the through hole 52d of the pressure-sensitive valve component 52 is completely closed during normal control has been described, but it is not limited to this. It is also possible that the opening and closing component maintains a state in which the through hole 52d is slightly open during normal control, for example, a state in which more than half of the axial direction of the through hole 52d is closed.

[0125] Furthermore, in the above embodiments 1 and 2, the case where the first helical springs 91 and 291 constituting the limiting unit are composed of conical helical springs has been described, but it is not limited to this. For example, they may also be composed of springs such as equidistant helical springs, which are the same as the second helical springs. In addition, the elastic body of the limiting unit may also be a spring other than a coil shape.

[0126] Furthermore, in the above embodiments, an example of separate main and auxiliary valve cores and pressure-sensitive valve components was described, but the two can also be formed as a single unit.

[0127] Alternatively, the pressure-sensitive valve component 52 may be formed separately as a base 52b and a flange 52c.

[0128] 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.

[0129] 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 the axial load, and does not necessarily need to have a sealing function.

[0130] 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.

[0131] Alternatively, the pressure-sensitive body 60 may not use a coil spring internally.

[0132] Symbol Explanation

[0133] 1: Outer shell; 2: Discharge chamber; 3: Suction chamber; 4: Control chamber; 10: Valve body; 10a: Main valve seat; 10c: Annular protrusion; 10d: Annular receiving part; 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 valves Core (valve core); 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: Sub-valve; 55: Intermediate connecting passage; 60: Pressure-sensitive body; 70: Connector; 70a: Right-side end face in the axial direction; 80: Solenoid; 90: Opening and closing component; 90a: Base (annular part); 90b: Protrusion; 90c: End face; 90d: End face; 91: First helical spring (restriction unit, elastomer, pair of springs); 92: Second helical spring (restriction unit, elastomer, pair of springs); 290: Opening / closing component; 291: First helical spring (restriction unit, elastomer, pair of springs); 292: Second helical spring (restriction unit, elastomer, pair of springs); 390: Opening / closing component; 390a: Base (annular part); 390b: Protrusion; 392: Helical spring (restriction unit, elastomer); 393: Stop (restriction unit); 490: Opening / closing component; 490a: Base (annular part); 490b: Groove; 493: Fixing component (restriction unit); 493a: Through hole; M: Variable capacity compressor; V1 to V4: Capacity control valves.

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 driven by a solenoid and a main valve seat disposed between the outlet and the control port and capable of contacting the valve core. A pressure-sensitive element, which is disposed in a pressure-sensitive chamber; as well as A pressure-sensitive valve component extends from the valve core to the pressure-sensitive chamber and, 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 is provided with an opening and closing component. This opening and closing component is restricted in its movement relative to the valve housing by a limiting unit, and slides relative to the pressure-sensitive valve component to open and close the through hole. The axial dimension of the through hole is less than or equal to the maximum stroke of the valve core.

2. The capacity control valve according to claim 1, wherein, The opening and closing component has an annular portion that can slide relative to the pressure-sensitive valve component.

3. The capacity control valve according to claim 1 or 2, wherein, The limiting unit has an elastic body that restricts the movement of the opening and closing component.

4. The capacity control valve according to claim 3, wherein, The elastic body is a pair of springs that push the opening and closing components against each other in the opening and closing directions.

5. The capacity control valve according to claim 3, wherein, The elastomer presses the opening / closing component toward the flange portion, which is formed on the pressure-sensitive valve component closer to the pressure-sensitive body than the through hole.

6. The capacity control valve according to claim 3, wherein, The limiting unit has a stop that abuts against the opening and closing component.

7. The capacity control valve according to claim 1 or 2, wherein, The limiting unit restricts the movement of the opening and closing component by fixing the opening and closing component relative to the valve housing.

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