valve

Abstract

Provided is a valve capable of reducing valve leakage.　The valve comprises: a valve housing 10 in which are formed ports 11, 12 through which a fluid passes; a valve body 51 driven by a driving source 80; a valve seat 40a on which a contact section 51a of the valve body 51 is seated; and biasing means 16, 17 which bias the valve body 51 in the valve-closing direction, wherein the valve seat 40a is formed of an elastic member 40.

Description

[Technical Field]

[0001] The present invention relates to a valve for variably controlling a working fluid, and more particularly to a valve for controlling the discharge amount of a variable displacement compressor used in an automotive air conditioning system in accordance with the pressure. [Background technology]

[0002] A variable displacement compressor used in an air conditioning system for an automobile or the like comprises a rotating shaft driven by an engine, a swash plate connected to the rotating shaft with a variable inclination angle, and compression pistons connected to the swash plate. The inclination angle of the swash plate is changed to change the stroke of the pistons and thereby control the amount of fluid discharged. The inclination angle of the swash plate can be continuously changed by appropriately controlling the pressure in the control chamber, which contains the suction pressure Ps in the suction chamber that draws in the fluid, the discharge pressure Pd in ​​the discharge chamber that discharges the fluid pressurized by the pistons, and the control pressure Pc in the control chamber that houses the swash plate, using a displacement control valve that is driven to open and close by the electromagnetic force of a solenoid as a driving source.

[0003] When the variable displacement compressor is continuously operated, the control computer controls the energization of the displacement control valve, which moves the valve disc axially using electromagnetic force generated by the solenoid, opening and closing the flow path between the discharge port and the control port with the valve, thereby performing normal control to adjust the control pressure Pc in the control chamber of the variable displacement compressor.

[0004] Some displacement control valves control the flow rate of fluid flowing from a control port to a suction port. For example, in the displacement control valve disclosed in Patent Document 1, when the solenoid is energized and the valve is open, fluid flows to the suction port through a through-flow passage connected to the control port in the housing. When the solenoid is de-energized from this open state, the rod-shaped valve element is moved toward a valve seat formed in the valve housing by the biasing force of the bellows, allowing it to close the through-flow passage. In this way, the pressure in the control chamber of the variable displacement compressor is controlled by utilizing the pressure difference between the control pressure Pc and the suction pressure Ps, which is lower than the control pressure Pc. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] International Publication No. 2020 / 218284 (pages 11 to 13, Figure 4) Summary of the Invention [Problem to be solved by the invention]

[0006] In a displacement control valve such as that described in Patent Document 1, a tapered contact portion is formed at one end of the valve disc, so that it contacts and seats on a valve seat formed on the inner circumferential surface of the valve housing over a wide area. However, the return movement of the valve disc toward the valve seat from an open state is due to the biasing force of a bellows, and the return force of the valve disc, which depends on the biasing force of the bellows, is small. Therefore, if contaminants become caught between the contact portion of the valve disc and the valve seat when the valve is closed, the contaminants may not be completely crushed, creating a gap between the contact portion of the valve disc and the valve seat, which could result in valve leakage.

[0007] The present invention has been made in light of these problems, and has as its object to provide a valve that can reduce valve leakage. [Means for solving the problem]

[0008] In order to solve the above problems, the valve of the present invention comprises: a valve housing having a port formed therein through which a fluid passes; a valve body driven by a drive source; a valve seat on which the contact portion of the valve body is seated; and a biasing means for biasing the valve body in a valve closing direction, At least one of the contact portion of the valve body and the valve seat is formed of an elastic member. With this, even if contaminants become caught between the contact portion of the valve body and the valve seat when the valve is closed, the elastic member will elastically deform, thereby preventing the occurrence of a gap between the contact portion and the valve seat, thereby reducing valve leakage.

[0009] the valve seat or the contact portion of the valve body that contacts the contact surface of the elastic member is formed by an annular protrusion, The elastic member may be formed to have a smaller elastic modulus than the annular projection. With this, even if contaminants become caught between the annular protrusion and the abutment surface of the elastic member when the valve is closed, the elastic member will reliably elastically deform, thereby preventing the occurrence of a gap between the abutment portion and the valve seat, thereby reducing valve leakage.

[0010] The contact surface may be a surface perpendicular to the driving direction of the valve body. This makes it difficult for the annular protrusion to move relative to the abutment surface of the elastic member when the valve is closed, thereby improving sealing performance and preventing the annular protrusion from damaging the abutment surface of the elastic member, thereby maintaining sealing performance for a long period of time.

[0011] The valve body or the valve housing is provided with an annular recess, The elastic member inserted into the annular recess may be fixed by crimping from at least one of the inner and outer sides in the radial direction. This can prevent the elastic member inserted into the annular recess from falling off.

[0012] The elastic member may have a rectangular cross section. This allows the annular projection to exert stable elasticity no matter where it abuts on the abutment surface of the elastic member.

[0013] the valve body is configured separately from the rod constituting the drive source so as to be able to come into contact with and separate from the rod, The rod may be biased in the valve opening direction by a rod biasing means. This allows the rod to be held in a position where it can move towards and away from the valve body while being biased in the valve opening direction, so that the valve body is not affected by the inertial force of the rod when the valve is closed, thereby preventing excessive load from being applied to the abutment portion or valve seat.

[0014] The biasing means may be a compression spring. This simplifies the structure of the drive source side of the valve, and even though the structure makes it easy for the valve disc to be misaligned, the abutting portion of the valve disc can be seated on the valve seat to obtain good sealing performance. [Brief explanation of the drawings]

[0015] [Figure 1] 1 is a cross-sectional view showing the structure of a capacity control valve according to a first embodiment of the present invention. [Figure 2] FIG. 2 is an enlarged cross-sectional view showing the state in which the CS valve is closed in the capacity control valve of the first embodiment. [Figure 3] FIG. 2 is an enlarged cross-sectional view showing the state in which the CS valve is opened in the capacity control valve of the first embodiment. [Figure 4] FIG. 4 is an enlarged cross-sectional view showing the elastic member elastically deformed when the CS valve is closed. [Figure 5] FIG. 5 is an enlarged cross-sectional view showing the structure of a capacity control valve according to a second embodiment of the present invention. [Figure 6] FIG. 10 is an enlarged cross-sectional view showing the structure of a capacity control valve according to a third embodiment of the present invention. [Figure 7] FIG. 10 is an enlarged cross-sectional view showing a state in which the CS valve is closed in the capacity control valve of the third embodiment. [Figure 8] FIG. 10 is an enlarged cross-sectional view showing a state in which the CS valve is opened in the capacity control valve of the third embodiment. [Figure 9] 10A and 10B are diagrams illustrating modified examples of the elastic member. DETAILED DESCRIPTION OF THE INVENTION

[0016] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the present invention will be described below with reference to the accompanying drawings. While the present invention will be described with reference to a capacity control valve, it is also applicable to valves for other purposes, such as expansion valves. [Example]

[0017] A displacement control valve according to a first embodiment will be described with reference to Figures 1 to 3. In the following description, the left and right sides as viewed from the front of Figure 1 will be referred to as the left and right sides of the displacement control valve. Specifically, the left side of the drawing where the valve housing 10 is located will be referred to as the left side of the displacement control valve, and the right side of the drawing where the solenoid 80 is located will be referred to as the right side of the displacement control valve.

[0018] The capacity control valve of the present invention is incorporated into a variable displacement compressor (not shown) used in the air conditioning system of an automobile, etc., and variably controls the pressure of the working fluid (hereinafter simply referred to as "fluid"), which is a refrigerant. In this way, the capacity control valve controls the discharge rate of the variable displacement compressor, thereby adjusting the air conditioning system to achieve a target cooling capacity.

[0019] First, we will explain the variable displacement compressor. The variable displacement compressor has a casing that includes a discharge chamber, a suction chamber, a control chamber, and multiple cylinders. The variable displacement compressor is provided with a communication passage that directly connects the discharge chamber and the control chamber. This communication passage is provided with a fixed orifice 9 for balancing the pressures in the discharge chamber and the control chamber (see Figure 1).

[0020] The variable displacement compressor also includes a rotating shaft 5, a swash plate 6, and multiple pistons 7. The rotating shaft 5 is driven to rotate by an engine (not shown) installed outside the casing. The swash plate 6 is connected to the rotating shaft within a control chamber via a hinge mechanism so that it can tilt relative to the rotating shaft. Multiple pistons 7 are connected to the swash plate and fitted to each cylinder so that they can reciprocate freely. By electromagnetically opening and closing the displacement control valve V, the pressure within the control chamber of the variable displacement compressor M is appropriately controlled using the suction pressure Ps in the suction chamber that draws in fluid, the discharge pressure Pd in ​​the discharge chamber that discharges fluid pressurized by the pistons, and the control pressure Pc in the control chamber that houses the swash plate. This continuously changes the inclination angle of the swash plate. This changes the stroke of the pistons, thereby controlling the fluid discharge rate from the variable displacement compressor.

[0021] As shown in Fig. 1, the displacement control valve V1 of this embodiment 1, which is incorporated into a variable displacement compressor, adjusts the current flowing through the coil 86 of the solenoid 80 serving as a drive source to control the opening and closing of the CS valve 50 in the displacement control valve V1. This adjusts the fluid flowing from the control chamber to the suction chamber, thereby variably controlling the control pressure Pc in the control chamber. Note that discharge fluid at the discharge pressure Pd in ​​the discharge chamber is constantly supplied to the control chamber via the fixed orifice 9, and closing the CS valve 50 in the displacement control valve V1 increases the control pressure Pc in the control chamber.

[0022] In the capacity control valve V1 of the first embodiment, the CS valve 50 is composed of a CS valve element 51 as a valve body and a CS valve seat 40a as a valve seat. The CS valve seat 40a is formed on an elastic member 40 that is press-fitted and crimped into an annular recess 10a of the valve housing 10. An abutment portion 51a formed on the axial right end of the CS valve element 51 moves axially toward and away from the CS valve seat 40a, thereby opening and closing the CS valve 50.

[0023] Next, the structure of the displacement control valve V1 will be described. As shown in Figure 1, the displacement control valve V1 is mainly composed of a valve housing 10 made of a metal material, a CS valve element 51 arranged in the valve housing 10 so as to be able to reciprocate axially, and a solenoid 80 connected to the valve housing 10 and applying a driving force to the CS valve element 51.

[0024] As shown in FIGS. 1 to 3, the CS valve body 51 is made of a metal or resin material and has a recess 51b in its center that opens to the right in the axial direction. The rod 52 is disposed so as to pass through the coil 86 of the solenoid 80. The left end of the rod 52 in the axial direction is inserted into the recess 51b so as to be able to move toward and away from the recess 51b. The CS valve body 51 also has a communicating passage 51c that passes through in the axial direction at a position offset radially outward from the recess 51b. The communicating passage 51c is formed to have a constant cross section. Note that a plurality of communicating passages 51c may be provided.

[0025] The CS valve element 51 also has an annular protrusion 51d that protrudes axially to the right, positioned radially outwardly of the communicating passage 51c. The tip of the annular protrusion 51d, i.e., the right end in the axial direction, forms a contact portion 51a that axially contacts and separates from the CS valve seat 40a. The contact portion 51a, which is the tip of the annular protrusion 51d, is rounded on both the inner and outer radial sides and has a cross-sectional shape with a flat portion between the rounded chamfers (see FIGS. 2 and 3). The cross-sectional shape may be substantially curved with no flat portion between the rounded chamfers, and a C-chamfer may be used instead of the rounded chamfer. Furthermore, chamfering is not essential; it may be formed on only one of the inner and outer radial sides, or may not be formed at all.

[0026] 1 to 3, the valve housing 10 is formed with a Ps port 11 that radially penetrates the valve housing 10 and is in communication with the suction chamber of the variable displacement compressor, and a Pc port 12 that is in communication with the control chamber. The Ps port 11 is formed axially to the right of the CS valve seat 40a, i.e., in the valve closing direction, which will be described later. The Pc port 12 is formed axially to the left of the CS valve seat 40a, i.e., in the valve opening direction, which will be described later.

[0027] The valve housing 10 is provided with a first valve chamber 13 to which fluid is supplied from the Pc port 12, and a second valve chamber 14 to which fluid that has passed through the CS valve 50 from the first valve chamber 13 is supplied and which communicates with the Ps port 11. The first valve chamber 13 is formed to the left of the CS valve seat 40a in the axial direction and is composed of a recess 10b that opens to the left in the axial direction, and the opening on the left in the axial direction is hermetically closed by a lid member 15.

[0028] A bellows 16 and a coil spring 17 are disposed in the first valve chamber 13 as biasing means for biasing the CS valve element 51 axially rightward, i.e., in the valve-closing direction. The bellows 16 has its left axial end sealed to the cover member 15 and its right axial end sealed to the left axial end face of the CS valve element 51, forming a space S1 inside. The coil spring 17 is a compression spring and is disposed in the space S1 formed inside the bellows 16.

[0029] Furthermore, the space S1 communicates with the second valve chamber 14 via the communication passage 51c, and the fluid in the second valve chamber 14 flows into the space S1. That is, the bellows 16 hermetically separates the space S1 from the first valve chamber 13 when the CS valve 50 is in the closed state.

[0030] The valve housing 10 also has a recess 10c formed on the inner diameter side of the right axial end, recessed axially leftward. The flange portion 82d of the center post 82 is inserted into the recess 10c from the right axial direction, thereby connecting and fixing the center post 82 integrally and substantially hermetically to the valve housing 10. An open end on the solenoid 80 side of the second valve chamber 14 is formed on the inner diameter side of the bottom surface of the recess 10c of the valve housing 10.

[0031] Here, the elastic member 40 will be described. As shown in Figures 1 to 3, the elastic member 40 is a ring with a rectangular cross section that is made of a material such as rubber or resin that has a smaller elastic modulus than the annular protrusion 51d of the CS valve body 51.

[0032] The elastic member 40 is press-fitted from the axial left into an annular recess 10a recessed axially rightward at the bottom of a recess 10b that defines the first valve chamber 13 of the valve housing 10, and is fixed by crimping using radially inner and outer crimping pieces 10d (see FIGS. 2 and 3) formed at the opening of the annular recess 10a. The exposed portion formed between the radially inner and outer crimping pieces 10d on the left-hand axial end face of the elastic member 40, i.e., the abutment surface 40s, serves as the CS valve seat 40a. The abutment portion 51a at the tip of the annular protrusion 51d of the CS valve body 51 can come into contact with and separate from the abutment surface 40s.

[0033] The elastic member 40 and the annular recess 10a before and after press-fitting have a rectangular cross section and are approximately the same size in the radial direction and thickness direction. The elastic member 40 before press-fitting may be formed slightly larger or smaller than the annular recess 10a.

[0034] The contact surface 40s of the elastic member 40 is a surface perpendicular to the driving direction of the CS valve body 51, and is formed with a radial width greater than the radial width of the annular protrusion 51d. This allows the contact portion 51a at the tip of the annular protrusion 51d to be reliably seated on the CS valve seat 40a, and prevents contact between the annular protrusion 51d and the radially inner and outer crimping pieces 10d.

[0035] 1, the solenoid 80 is mainly composed of a casing 81 having an opening 81a that opens axially leftward, a generally cylindrical center post 82 that is inserted into the opening 81a of the casing 81 from the axial left and fixed to the inner diameter side of the casing 81, a rod 52 that is inserted through the center post 82 and is movable back and forth axially, with its left axial end located axially left of the CS valve seat 40a, a CS valve element 51 that is press-fitted and fixed into the left axial end of the rod 52, a movable iron core 84 into which the right axial end of the rod 52 is inserted and fixed, a coil spring 85 that serves as rod biasing means that is located on the axial right side of the movable iron core 84 and biases the rod 52 that is inserted and fixed to the movable iron core 84 in the axial leftward, i.e., in the valve-opening direction, and an excitation coil 86 that is wound around the outside of the center post 82 via a bobbin. The coil spring 85 is a compression spring.

[0036] The casing 81 has a recess 81b formed on the inner diameter side of the left axial end thereof, recessed axially rightward, and the right axial end of the valve housing 10 is inserted into and fixed to this recess 81b in a substantially sealed manner.

[0037] The center post 82 is formed from a rigid body that is a magnetic material such as iron or silicon steel, and includes a cylindrical portion 82b that extends axially and has an insertion hole 82c through which the rod 52 is inserted, and an annular flange portion 82d that extends radially outward from the outer peripheral surface of the left axial end of the cylindrical portion 82b.

[0038] Furthermore, the center post 82 is inserted into and fixed in a substantially sealed manner into the recess 10c of the valve housing 10, which is inserted into and fixed in the recess 81b of the casing 81, with the axially right end face of the flange portion 82d abutting from the axial left against the bottom surface of the recess 81b of the casing 81. In other words, the center post 82 is fixed by having the flange portion 82d sandwiched from both axial sides between the bottom surface of the recess 81b of the casing 81 and the bottom surface of the recess 10c of the valve housing 10.

[0039] Next, the opening and closing operation of the displacement control valve V1 will be described.

[0040] First, the de-energized state of the capacity control valve V1 will be described. As shown in Figures 1 and 2, in the capacity control valve V1, in the de-energized state, the CS valve element 51 is pressed axially rightward, i.e., in the valve closing direction, by the biasing forces of the bellows 16 and the coil spring 17, so that the abutment portion 51a at the tip of the annular protrusion 51d of the CS valve element 51 seats on the CS valve seat 40a formed on the axially left end face of the elastic member 40, and the CS valve 50 is closed.

[0041] At this time, the effective pressure receiving area A of the bellows 16, the effective pressure receiving area B of the CS valve body 51, and the rightward axial direction are positive, and the CS valve body 51 is subjected to the biasing force (F bel ) and the biasing force of the coil spring 17 (F sp1 ) and the force due to the control pressure Pc (F P1 ) = (P1 × (AB)) and the force due to the suction pressure Ps (F P2 ) = -(P2 × (AB)) and the biasing force of the coil spring 85 (F sp2 That is, the force F acts on the CS valve body 51, with the rightward axial direction being positive. rod =F bel +F sp1 +F P1 -F P2 -F sp2 is at work.

[0042] More specifically, the fluid in the space S1 acts on the axially left end face of the CS valve disc 51, and the fluid in the second valve chamber 14 acts on the axially right end face of the CS valve disc 51. The second valve chamber 14 and the space S1 are connected by a communication passage 51c formed in the CS valve disc 51, so that the fluid in the second valve chamber 14 on the valve closing side of the CS valve disc 51, i.e., the fluid at the suction pressure Ps supplied from the Ps port 11, flows into the space S1.

[0043] Furthermore, because the communicating passage 51c is a restricted through-hole, when a slight pressure difference momentarily occurs between the pressure in the space S1 and the pressure in the second valve chamber 14, the fluid in the space S1 is less likely to move momentarily toward the second valve chamber 14 and is instead retained within the space S1, making it easier to maintain the closed state of the CS valve 50.

[0044] In this way, the fluid flowing into the space S1 and the second valve chamber 14 is a fluid having the same suction pressure Ps supplied from the Ps port 11. In this embodiment, the effective pressure-receiving area A of the bellows 16 is equal to the effective pressure-receiving area B of the CS valve element 51 (A=B), so the force (F) acting on the CS valve element 51 due to the control pressure Pc and the suction pressure Ps is P1 ),(F P2 ) are almost zero. In other words, the force F rod =F bel +F sp1 -F sp2 is at work.

[0045] Next, the energized state of the displacement control valve V1 will be described. As shown in Fig. 3, in the energized state, that is, during normal control, or so-called duty control, the displacement control valve V1 generates an electromagnetic force (F sol ) is the force F rod Exceeds (F sol >F rod), the movable core 84 is drawn toward the center post 82, i.e., to the left in the axial direction, and the rod 52 fixed to the movable core 84 and the CS valve element 51 held so as to be able to approach and separate from the rod 52 move together to the left in the axial direction, i.e., in the valve-opening direction. As a result, the abutting portion 51a of the CS valve element 51 moves away from the CS valve seat 40a formed on the abutting surface 40s of the elastic member 40, opening the CS valve 50. Furthermore, when the solenoid 80 is driven, the movable core 84 comes into contact with the right side of the center post 82 in the axial direction, thereby restricting the CS valve element 51 from moving further away from the CS valve seat 40a.

[0046] In this way, the capacity control valve V1 can control the pressure in the control chamber of the variable capacity compressor by utilizing the pressure difference between the suction pressure Ps, which is lower than the control pressure Pc, and the valve opening of the CS valve 50, which is adjusted by balancing the electromagnetic force of the solenoid 80 with the biasing forces of the bellows 16, coil spring 17, and coil spring 85.

[0047] As described above, in the capacity control valve V1 of this embodiment 1, even if contaminants become caught between the abutment portion 51a at the tip of the annular protrusion 51d of the CS valve body 51 and the CS valve seat 40a formed on the abutment surface 40s of the elastic member 40 when the valve is closed, the elastic member 40 is elastically deformed to prevent the occurrence of a gap between the abutment portion 51a of the CS valve body 51 and the CS valve seat 40a, thereby reducing valve leakage.

[0048] Furthermore, the elastic member 40 is formed to have a smaller elastic coefficient, i.e., Young's modulus, than the annular protrusion 51d of the CS valve body 51. Therefore, even if contaminants become caught between the abutment portion 51a of the CS valve body 51 and the CS valve seat 40a formed on the abutment surface 40s of the elastic member 40 when the valve is closed, the elastic member 40 reliably deforms, thereby preventing the occurrence of a gap between the abutment portion 51a of the CS valve body 51 and the CS valve seat 40a. Furthermore, regardless of whether contaminants are caught, when the valve is closed, the abutment portion 51a at the tip of the annular protrusion 51d elastically deforms the elastic member 40 and is slightly embedded therein (see FIG. 4), making it difficult for the CS valve body 51 to move relative to the abutment surface 40s of the elastic member 40 when the CS valve 50 is in the closed state, thereby improving sealing performance.

[0049] The contact surface 40s of the elastic member 40 on which the CS valve seat 40a is formed is a surface perpendicular to the drive direction of the CS valve body 51, which makes it even more difficult for the annular protrusion 51d to move relative to the contact surface 40s of the elastic member 40 when the valve is closed, thereby improving the sealing performance. Furthermore, by suppressing the relative movement of the annular protrusion 51d with respect to the contact surface 40s of the elastic member 40 when the valve is closed, the contact surface 40s of the elastic member 40 is prevented from being damaged by the annular protrusion 51d, and the sealing performance can be maintained for a long period of time. In addition, in the capacity control valve V1 of this embodiment, the CS valve body 51 and the rod 52 are held so that they can be brought into contact with and separated from each other, and the CS valve body 51 is supported by the bellows 16 fixed to the valve housing 10 via the cover member 15 axially to the left of the CS valve seat 40a, so that the CS valve body 51 is easily movable when the valve is closed. However, as described above, the relative movement of the annular protrusion 51d with respect to the abutment surface 40s of the elastic member 40 is suppressed, so that sealing performance and durability are guaranteed.

[0050] Furthermore, the tip portion of the annular protrusion 51d has its inner and outer radial corners rounded and formed into a generally curved cross section, which further prevents the annular protrusion 51d from damaging the contact surface 40s of the elastic member 40.

[0051] When the materials of the contact portion of the valve body and the valve seat are a combination of metals, as in the past, gaps are likely to occur due to the ingress of contaminants, and gaps are also likely to occur due to misalignment between the contact portion of the valve body and the valve seat when the valve is closed, making valve leakage more likely to occur. However, as described above, in this embodiment 1, these problems can be solved by forming a CS valve seat 40a on the contact surface 40s of the elastic member 40.

[0052] Furthermore, an annular recess 10a is provided in the valve housing 10, and the elastic member 40 is press-fitted into the annular recess 10a and crimped and fixed by radially inner and outer crimping pieces 10d, thereby preventing the elastic member 40 inserted into the annular recess 10a from falling out. Note that by press-fitting the elastic member 40 into the annular recess 10a or by crimping and fixing it by the radially inner and outer crimping pieces 10d, the elastic member 40 may be deformed in the radial direction and the abutment surface 40s may be slightly raised axially leftward, making it easier for the abutment portion 51a at the tip of the annular protrusion 51d to be embedded in the abutment surface 40s of the elastic member 40 when the valve is closed.

[0053] Furthermore, since the elastic member 40 has a rectangular cross section, it can exert stable elasticity no matter where the annular protrusion 51d abuts on the abutment surface 40s of the elastic member 40.

[0054] Furthermore, the CS valve element 51 is configured separately from the rod 52 that constitutes the solenoid 80, and the rod 52 is biased in the valve-opening direction by a coil spring 85, so that the CS valve element 51 and the rod 52 can be brought into contact with and separated from each other. When the valve is closed, the abutment portion 51a of the CS valve element 51 seats on the CS valve seat 40a formed on the abutment surface 40s of the elastic member 40, and at the same time, the CS valve element 51 is not affected by the inertial force of the rod 52 acting to the right when the CS valve element 51 moves axially. Therefore, an excessive load is not applied to the annular protrusion 51d or the elastic member 40. In other words, when the valve is closed, only the biasing forces of the bellows 16 and the coil spring 17 act on the annular protrusion 51d and the elastic member 40, so that an excessive load is not applied to the annular protrusion 51d or the elastic member 40, preventing damage.

[0055] Furthermore, since the coil spring 17 disposed inside the bellows 16 is a compression spring, the structure of the solenoid 80 side of the capacity control valve V1 is simplified, and although the CS valve body 51 has a structure that makes it prone to axial misalignment, the abutment portion 51a at the tip of the annular protrusion 51d of the CS valve body 51 can be seated on the CS valve seat 40a, thereby achieving good sealing performance.

[0056] It is sufficient that the valve housing 10 is provided with a crimping piece 10d at least on either the inner or outer side in the radial direction. [Example]

[0057] A displacement control valve according to a second embodiment will be described with reference to Fig. 5. Note that a description of the same configuration as in the first embodiment will be omitted.

[0058] 5, in the displacement control valve V2 of the second embodiment, the valve housing is such that the left axial end of the second valve housing 211 is fitted onto the right axial end of the first valve housing 210 from the right axial direction, so that the two are connected and fixed together in a substantially sealed state. The first valve housing 210 is formed with a Pc port 12 that communicates with the control chamber of the variable displacement compressor. The second valve housing 211 is formed with a Ps port 11 that communicates with the suction chamber of the variable displacement compressor.

[0059] An annular recess 211a recessed axially rightward is formed at the left axial end of the second valve housing 211, and an elastic member 240 is press-fitted into the annular recess 211a from the left axial direction and is crimped and fixed by a crimping piece 211d formed on the inner diameter side of the opening of the annular recess 211a. Furthermore, when the first valve housing 210 and the second valve housing 211 are connected and fixed, an annular protrusion 210a with a rectangular cross section formed at the right axial end of the first valve housing 210 is pressed against the outer diameter side of the left axial end face of the elastic member 240, thereby holding the elastic member 240 sandwiched between the first valve housing 210 and the second valve housing 211.

[0060] Furthermore, on the left axial end face of the elastic member 240, an exposed portion formed between the annular protrusion 210a of the first valve housing 210 and the crimping piece 211d of the second valve housing 211, i.e., the abutment surface 240s, forms a CS valve seat 240a as a valve seat.

[0061] According to this, in the capacity control valve V2 of this second embodiment, the elastic member 240 is held in a sandwiched state between the first valve housing 210 and the second valve housing 211, which are connected and fixed together, and therefore, the elastic member 240 inserted into the annular recess 211a can be prevented from falling off.

[0062] Furthermore, compared to the case where radially inner and outer crimping pieces 10d are formed inside the valve housing 10 as in the above-described first embodiment, in the second embodiment, the valve housing is divided, which makes it easier to process the first valve housing 210 and the second valve housing 211 for holding the elastic member 240.

[0063] In the second embodiment, the elastic member 240 can be held by the annular protrusion 210a of the first valve housing 210, so the crimping piece 211d does not need to be formed on the second valve housing 211. This means that only the recess of the annular recess 211a needs to be formed in the second valve housing 211, making processing even easier. [Example]

[0064] A displacement control valve according to a third embodiment will be described with reference to Figures 6 to 8. Note that a description of the same configuration as in the first embodiment will be omitted.

[0065] As shown in Figure 6, in the capacity control valve V3 of this third embodiment, the CS valve 50 is composed of a CS valve body 351 as a valve body and a CS valve seat 310a as a valve seat at the tip of an annular protrusion 310d of a valve housing 310, and the CS valve 50 opens and closes when the abutment portion 340a formed on the abutment surface 340s of an elastic member 340, which is press-fitted and crimped into an annular recess 351a formed at the axial right end of the CS valve body 351, moves axially toward and away from the CS valve seat 310a.

[0066] As shown in FIGS. 6 to 8, the CS valve body 351 is made of a metal material, and the CS valve body 51 has an annular recess 351a recessed axially leftward at a position further outwardly shifted from the communicating passage 351c.

[0067] The elastic member 340 is press-fitted into the annular recess 351a of the CS valve body 351 from the right in the axial direction, and is fixed by crimping using radially inner and outer crimping pieces 351d (see FIGS. 7 and 8) formed at the opening of the annular recess 351a. Furthermore, an exposed portion formed between the radially inner and outer crimping pieces 351d, i.e., a contact surface 340s, forms a contact portion 340a of the CS valve body 351 on the right end face in the axial direction of the elastic member 340. The contact portion 340a is capable of coming into contact with and releasably contacting the CS valve seat 310a at the tip of the annular protrusion 310d of the valve housing 310.

[0068] 6 to 8, the valve housing 310 has an annular protrusion 310d that protrudes axially leftward and is formed at the bottom of a recess 310b that constitutes the first valve chamber 13. A CS valve seat 310a, with which the abutment portion 340a of the CS valve element 351 comes into contact and separates in the axial direction, is formed at the tip of the annular protrusion 310d, i.e., at the right end in the axial direction.

[0069] According to this, in the displacement control valve V3 of the third embodiment, the elastic member 340 is provided on the CS valve body 351, which is a member assembled to the valve housing 310, so that the CS valve body 351 for holding the elastic member 340 can be easily processed.

[0070] It is sufficient that the CS valve body 351 is provided with the crimping piece 351d at least on either the inner or outer side in the radial direction.

[0071] Although the embodiments of the present invention have been described above with reference to the drawings, the specific configuration is not limited to these embodiments, and the present invention also includes modifications and additions that do not deviate from the gist of the present invention.

[0072] For example, in the above embodiment, either the contact portion of the CS valve disc or the CS valve seat, which faces the annular protrusion in the axial direction, is made of an elastic material. However, this is not limiting, and both the contact portion of the CS valve disc and the CS valve seat may be made of an elastic material. In this case, only the annular protrusion may be made of an elastic material. Furthermore, it is preferable that the elastic material on which the contact surface is formed has a smaller elastic modulus than the elastic material constituting the annular protrusion. Note that both the contact portion of the CS valve disc and the CS valve seat may be made of an elastic material with the same elastic modulus.

[0073] Furthermore, the contact surface of the elastic member does not have to be a surface perpendicular to the driving direction of the CS valve body, and may be formed as, for example, an inclined surface or a curved surface.

[0074] In the above embodiment, the valve housing and the CS valve body are described as being made of metal or resin, but the member in which the elastic member is held by crimping is preferably made of metal. Furthermore, if the member in which the elastic member is held is made of resin, for example, a portion that serves as a pressing piece to prevent the elastic member from falling off may be thickened instead of a crimping piece.

[0075] In the above embodiment, the elastic member is press-fitted into the annular recess, but the elastic member may simply be inserted into the annular recess. The elastic member is not limited to being disposed within the annular recess, and may be fixed to the valve housing or the CS valve body by a separate member such as an adhesive or a bolt.

[0076] Further, the elastic member is not limited to having a rectangular cross-section, and may have, for example, a circular, triangular, T-shaped, V-shaped, X-shaped, or other cross-sectional shape. For example, as shown in FIG. 9, when the elastic member 40' is formed with a T-shaped cross-section, it may be caulked and fixed by pressing a step portion provided on the elastic member 40' press-fitted into the annular recess 10a with caulking pieces 10d on the inner and outer diameters in the radial direction.

[0077] Also, in the above embodiment, the CS valve body was described as being composed of a rod penetrating through the solenoid coil and a separate member and being separable, but it is not limited to this, and the CS valve body, which is a separate member, and the rod may be integrally connected and fixed. Further, the CS valve body and the rod may be integrally formed. In this case, the coil spring for biasing the rod in the valve opening direction may not be provided.

[0078] Also, since a coil spring is disposed inside the bellows, the bellows itself may not have a biasing force.

[0079] Also, a coil spring may not be disposed inside the bellows.

[0080] Also, in the above embodiment, the aspect where the effective pressure-receiving area A of the bellows and the effective pressure-receiving area B of the CS valve body are the same (A = B) was described, but it is not limited to this, and the effective pressure-receiving area A may be made slightly larger than the effective pressure-receiving area B (A > B) so as to reliably maintain the closed state of the CS valve, or the effective pressure-receiving area B may be made slightly larger than the effective pressure-receiving area A (A < B) to facilitate opening of the CS valve. That is, it is sufficient that the influence of the fluid pressure acting on both sides in the moving direction of the CS valve body is reduced.

[0081] Also, the capacity control valve in the above embodiment was described by taking the CS valve as an example, but it is not limited to this, and it may be a DC valve that opens and closes the flow path between the Pd port and the Pc port.

[0082] Also, the drive source may be other than a solenoid.

Description of Reference Numerals

[0083] 9 Fixed Orifice 10 Valve housing 10a Annular recess 10d Crimping piece 11 Ps port (port) 12 PC ports (ports) 13 1st valve chamber 14 2nd valve chamber 15 Lid member 16 Bellows (biasing means for biasing the valve body in the valve closing direction) 17 Coil spring (biasing means for biasing the valve body in the valve closing direction) 40 Elastic member 40a CS valve seat (valve seat) 40s Contact surface 50 CS valve 51 CS valve body (valve body) 51a Contact part 51d Annular protrusion 52 Rod 80 Solenoid (drive source) 85 Coil spring (rod biasing means) 210 First valve housing (valve housing) 210a Annular convex part 211 Second valve housing (valve housing) 211a Annular recess 211d Caulking piece 240 Elastic member 240a CS valve seat (valve seat) 240s Contact surface 310 valve housing 310a CS valve seat (valve seat) 310d Annular protrusion 340 Elastic Members 340a Contact part 340s contact surface 351 CS valve body (valve body) 351a Annular recess 351d Crimping piece S1 space V1, V2, V3 capacity control valves (valves)

Claims

1. a valve housing having a port formed therein through which a fluid passes; a valve body driven by a drive source; a valve seat on which the contact portion of the valve body is seated; and a biasing means for biasing the valve body in a valve closing direction. The valve housing is composed of at least a first valve housing and a second valve housing that are connected and fixed to each other, the valve seat is formed by an annular elastic member, The valve housing is provided with an annular recess, The elastic member is pressed into the annular recess by being sandwiched between the first valve housing and the second valve housing.

2. The contact portion of the valve body that contacts the contact surface of the elastic member is configured by an annular protrusion, 2. The valve according to claim 1, wherein the elastic member is formed to have a smaller elastic modulus than the annular projection.

3. The valve according to claim 2 , wherein the contact surface is a surface perpendicular to the driving direction of the valve body.

4. A valve as described in any one of claims 1 to 3, wherein the elastic member inserted into the annular recess is crimped and fixed from at least one of the inside and outside radial directions.

5. 5. The valve according to claim 1, wherein the elastic member has a rectangular cross section.

6. the valve body is configured separately from the rod constituting the drive source so as to be able to come into contact with and separate from the rod, 6. The valve according to claim 1, wherein the rod is biased in the valve opening direction by a rod biasing means.

7. 7. A valve according to claim 1, wherein the biasing means is a compression spring.

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