Differential pressure valve and valve device

Abstract

To provide a differential pressure valve that can reduce noise, and can be made relatively easily, and a valve device comprising the differential pressure valve.SOLUTION: A valve body 10 of a solenoid valve is provided with a differential pressure valve part 50. The differential pressure valve part 50 comprises: a diaphragm 51 partitioning a differential pressure valve chamber 13 and a first outflow port 14; a differential pressure valve element 56 provided in the differential pressure valve chamber 13, and to be moved by the diaphragm 51; a stopper 57 arranged in the first outflow port 14, and to be moved together with the differential pressure valve element 56; and a sleeve 52 made of synthetic resin. The sleeve 52 comprises a first portion with which the stopper 57 is slidably in contact, and a second portion fixed to the valve body 10.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a differential pressure valve and a valve device having the differential pressure valve.

Background Art

[0002] A solenoid valve with a differential pressure valve, which is an example of a conventional valve device, is disclosed in Patent Document 1. The solenoid valve of Patent Document 1 has a solenoid valve portion and a differential pressure valve portion integrally provided in one valve body. The valve body has a main valve chamber, a differential pressure valve chamber, an inlet, a first outlet, and a second outlet. The inlet is connected to the main valve chamber. The main valve chamber is connected to the first outlet via a main valve seat. The main valve chamber is also connected to the differential pressure valve chamber via a branch passage. The differential pressure valve chamber is connected to the second outlet via a differential pressure valve seat. The solenoid valve portion has a main valve body that opens and closes the main valve seat. The differential pressure valve portion has a differential pressure valve body that opens and closes the differential pressure valve seat.

[0003] The differential pressure valve portion has a synthetic resin diaphragm that partitions the differential pressure valve chamber and the first outlet as a back pressure chamber, and a differential pressure valve body is attached to the diaphragm. When the diaphragm deforms due to the differential pressure between the differential pressure valve chamber and the first outlet, the differential pressure valve body moves to open and close the differential pressure valve seat.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] The differential pressure valve portion of the electromagnetic valve described above has a vibration-proof spring that moves together with the differential pressure valve body. The vibration-proof spring has a plurality of elastic legs that slidably contact the inner peripheral surface of a cylindrical differential pressure valve frame attached to the valve body. Each elastic leg extends from the differential pressure valve chamber side toward the first outlet side, and its tip is an open end that is not fixed. The plurality of elastic legs are elastically deformed so as to be pressed against the inner peripheral surface of the differential pressure valve frame by a restoring force directed radially outward. The vibration-proof spring generates a resistance force against the movement of the differential pressure valve body, suppressing minute vibrations of the differential pressure valve body. As a result, noise generated by the repeated opening and closing of the differential pressure valve seat can be suppressed. However, when the vibration-proof spring moves together with the differential pressure valve body, a force may be applied to the plurality of elastic legs in the radially inward or radially outward direction by the refrigerant. In particular, in a configuration where the elastic legs are inclined with respect to the moving direction, this force becomes large. Therefore, it is necessary to elastically deform the elastic legs in consideration of the variation in the force with which the elastic legs are pressed against the inner peripheral surface of the differential pressure valve frame, and it is difficult to manufacture a vibration-proof spring having elastic legs that are appropriately pressed against the inner peripheral surface of the differential pressure valve frame.

[0006] Therefore, an object of the present invention is to provide a differential pressure valve and a valve device having the differential pressure valve that can suppress noise and can be manufactured relatively easily.

Means for Solving the Problems

[0007] In order to achieve the above object, a differential pressure valve according to an aspect of the present invention includes a valve body having a valve chamber and a back pressure chamber, a diaphragm partitioning the valve chamber and the back pressure chamber, a valve body disposed in the valve chamber and moved by the diaphragm, and a moving member disposed in the back pressure chamber and moved together with the valve body. The differential pressure valve is characterized by including a contact member having a first portion with which the moving member slidably contacts and a second portion fixed to the valve body.

[0008] In the present invention, the first portion has a cylindrical shape, the second portion has a frustum-shaped cylindrical shape that is connected to one end of the first portion and has a diameter that increases as it moves away from the first portion, is fixed to the valve body over the entire circumferential direction, the moving member has a cylindrical circumferential wall portion and a disc-shaped bottom wall portion connected to one end of the circumferential wall portion, the bottom wall portion contacts the diaphragm, the circumferential wall portion is disposed inside the first portion, and the outer circumferential surface of the circumferential wall portion is slidably in contact with the inner circumferential surface of the first portion, which is preferable.

[0009] In the present invention, it is preferable that a pressure equalizing groove extending from one end to the other end of the first portion is provided on the inner circumferential surface of the first portion.

[0010] In the present invention, the differential pressure valve has an annular holding member and a cylindrical differential pressure valve frame attached to the valve body and pressing the holding member toward the valve body, the holding member has an annular plane contacting the outer peripheral portion of the diaphragm and an outward tapered surface on the side opposite to the annular plane, the differential pressure valve frame has an inward tapered surface, and the second portion is preferably held between the outward tapered surface and the inward tapered surface.

[0011] In order to achieve the above object, a valve device according to another aspect of the present invention includes an inlet, a main valve chamber connected to the inlet, a first outlet connected to the main valve chamber via a main valve seat, a differential pressure valve chamber connected to the main valve chamber via a branch passage, a second outlet connected to the differential pressure valve chamber via a differential pressure valve seat, a valve body having the above, a main valve body disposed in the main valve chamber, a diaphragm partitioning the differential pressure valve chamber and the first outlet, a differential pressure valve body disposed in the differential pressure valve chamber and moved by the diaphragm, and a moving member disposed at the first outlet and moved together with the differential pressure valve body. The valve device is characterized by including a contact member having a first portion with which the moving member is slidably in contact and a second portion fixed to the valve body.

Effects of the Invention

[0012] According to the present invention, the contact member has a first portion and a second portion. A moving member that moves together with the valve body slidably contacts the first portion, and the second portion is fixed to the valve body. Since it is configured in this way, a resistance force against the movement of the valve body (differential pressure valve body) is generated by the contact member, and the vibration of the valve body can be suppressed. Further, since the contact member is fixed to the valve body, fluctuations in the force with which the contact member contacts the moving member due to the refrigerant do not occur. Therefore, adjustment of the contact member and the like are not required, and a differential pressure valve and a valve device having the differential pressure valve can be manufactured relatively easily. Further, if the contact member is made of synthetic resin, metal powder is not generated. Therefore, damage to the diaphragm due to metal powder can be suppressed.

Brief Description of the Drawings

[0013]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Embodiments for Carrying Out the Invention

[0014] Hereinafter, an electromagnetic valve with a differential pressure valve according to an embodiment of the valve device of the present invention will be described with reference to FIGS. 1 to 5.

[0015] FIG. 1 is a cross-sectional view of a solenoid valve with a differential pressure valve according to an embodiment of the present invention. FIGS. 2 and 3 are enlarged cross-sectional views of the differential pressure valve portion of the solenoid valve with a differential pressure valve. FIG. 2 shows the differential pressure valve portion in a closed valve state. FIG. 3 shows the differential pressure valve portion in an open valve state. FIG. 4 is an enlarged cross-sectional view of the portion surrounded by the dashed-dotted circle in FIG. 2. FIG. 5 is a view showing the sleeve of the solenoid valve with a differential pressure valve. FIGS. 5A, 5B, and 5C are a side view, a front view, and a perspective view of the sleeve. In the following description, the terms "up, down, left, and right" correspond to up, down, left, and right in FIGS. 1 to 4, and indicate the relative positional relationship of each component.

[0016] As shown in FIGS. 1 to 5, the solenoid valve 1 with a differential pressure valve of the present embodiment (hereinafter simply referred to as "solenoid valve 1") has a valve body 10. The valve body 10 is provided with a solenoid valve portion 30 and a differential pressure valve portion 50.

[0017] The valve body 10 has a substantially rectangular parallelepiped shape. The valve body 10 has an inlet port 11, a main valve chamber 12, a differential pressure valve chamber 13, a first outlet port 14, and a second outlet port 15.

[0018] The inlet port 11 opens on the left side surface 10a of the valve body 10. The inlet port 11 is connected to the main valve chamber 12. A circular main valve seat 17 surrounding the main valve port 16 is provided in the main valve chamber 12. The main valve chamber 12 is connected to the first outlet port 14 via the main valve seat 17 (main valve port 16). The first outlet port 14 opens on the left side surface 10a of the valve body 10. The main valve chamber 12 is also connected to the differential pressure valve chamber 13 via a branch passage 18. A circular differential pressure valve seat 20 surrounding the differential pressure valve port 19 is provided in the differential pressure valve chamber 13. The differential pressure valve chamber 13 is connected to the second outlet port 15 via the differential pressure valve seat 20 (differential pressure valve port 19). The second outlet port 15 opens on the back surface of the valve body 10. The differential pressure valve chamber 13 has an opening facing the first outlet port 14, and the valve body 10 has a holding surface 10b which is an annular plane surrounding the opening.

[0019] The solenoid valve portion 30 has a fixed iron core 31, a case 32, a plunger 33, an electromagnetic coil 34, a valve shaft 35, a pilot valve body 36, and a main valve body 40.

[0020] The fixed core 31 integrally has a first cylindrical portion 31a and a second cylindrical portion 31b. The outer diameter of the second cylindrical portion 31b is smaller than the inner diameter of the first cylindrical portion 31a. The second cylindrical portion 31b is coaxially connected to the upper end of the first cylindrical portion 31a. The first cylindrical portion 31a is fixed to the valve body 10 by a screw structure. The second cylindrical portion 31b is arranged to extend upward from the valve body 10. The fixed core 31 is also called an armature.

[0021] The case 32 has a cylindrical shape. The lower end of the case 32 is open and the upper end is closed. The second cylindrical portion 31b of the fixed core 31 is inserted into the lower end of the case 32. The case 32 is joined to the fixed core 31.

[0022] The plunger 33 has a cylindrical shape. The outer diameter of the plunger 33 is slightly smaller than the inner diameter of the case 32. The plunger 33 is arranged to be movable in the vertical direction inside the case 32. A plunger spring 38 is arranged between the plunger 33 and the second cylindrical portion 31b of the fixed core 31. The plunger spring 38 is a compression coil spring and pushes the plunger 33 upward.

[0023] The electromagnetic coil 34 has a cylindrical shape. The case 32 is arranged inside the electromagnetic coil 34. The fixed core 31 and the plunger 33 are magnetized by the electromagnetic coil 34.

[0024] The valve shaft 35 has an elongated cylindrical shape. The upper end of the valve shaft 35 is fixed to the plunger 33. The valve shaft 35 is inserted into the second cylindrical portion 31b of the fixed core 31. The valve shaft 35 is supported by the second cylindrical portion 31b so as to be movable in the vertical direction. The valve shaft 35 has a fluid passage 35a. The fluid passage 35a extends from the upper end to the vicinity of the lower end of the valve shaft 35.

[0025] The pilot valve body 36 is integrally connected to the lower end of the valve shaft 35. A disc-shaped packing 36a is attached to the lower surface of the pilot valve body 36.

[0026] The main valve body 40 integrally has a body portion 41, an upper flange portion 42, and a lower flange portion 43.

[0027] The body portion 41 has a cylindrical shape. The body portion 41 has a pilot passage 44. The pilot passage 44 extends from the upper end to the lower end of the body portion 41. A pilot valve seat 45 surrounding the pilot passage 44 is provided at the upper end of the body portion 41. The packing 36a of the pilot valve body 36 comes into contact with and separates from the pilot valve seat 45.

[0028] The upper flange portion 42 is disposed above the body portion 41. The upper flange portion 42 is disposed slidably in the vertical direction inside the first cylindrical portion 31a of the fixed iron core 31. The upper flange portion 42 partitions the main valve chamber 12 and the pilot valve chamber 37 inside the fixed iron core 31. The upper flange portion 42 has a pressure equalizing passage 42a. The pressure equalizing passage 42a connects the main valve chamber 12 and the pilot valve chamber 37. An opening spring 39 is disposed between the upper flange portion 42 and the valve body 10. The opening spring 39 is a compression coil spring and presses the main valve body 40 upward.

[0029] The lower flange portion 43 is disposed below the body portion 41. An annular plate-shaped packing 43a is attached to the lower surface of the lower flange portion 43. The packing 43a comes into contact with and separates from the main valve seat 17. The outer diameter of the lower flange portion 43 is smaller than the outer diameter of the upper flange portion 42.

[0030] Note that the solenoid valve unit 30 is a normally open solenoid valve that is in an open valve state when the electromagnetic coil 34 is not energized, but it may also be a normally closed solenoid valve that is in a closed valve state when the electromagnetic coil 34 is not energized.

[0031] The differential pressure valve section 50 includes a diaphragm 51, a sleeve 52, a sealing member 53, a holding member 54, a differential pressure valve frame 55, a differential pressure valve body 56, and a stopper 57.

[0032] The diaphragm 51 is a thin film body made of a synthetic resin such as polyimide, for example. The diaphragm 51 has a circular sheet shape. The diaphragm 51 is disposed in the valve body 10 so as to partition the differential pressure valve chamber 13 and the first outlet 14 as a back pressure chamber.

[0033] The diaphragm 51 integrally has a central portion 51a and an outer peripheral portion 51b. The central portion 51a is configured to have a frustum shape that protrudes toward the differential pressure valve chamber 13 in a state where there is no differential pressure between the differential pressure valve chamber 13 and the first outlet 14. The outer peripheral portion 51b has an annular shape. The inner peripheral edge of the outer peripheral portion 51b is connected to the outer peripheral edge of the central portion 51a. Note that the frustum shape in this specification includes, for example, a shape in which the outer peripheral edge and the ceiling portion are connected by a smooth curved surface like a dome shape with a gently raised central portion, and a shape constituted by a smooth curved surface for the outer peripheral edge and the ceiling portion.

[0034] The sleeve 52 is a thin film body made of a synthetic resin such as polytetrafluoroethylene (PTFE) or polyimide, for example. The sleeve 52 has an overall cylindrical shape. The sleeve 52 is disposed along the left - right direction. The sleeve 52 integrally has a first portion 52a and a second portion 52b. The first portion 52a has a cylindrical shape. The first portion 52a has a pressure equalizing groove 52d. The pressure equalizing groove 52d is disposed on the inner peripheral surface 52c of the first portion 52a and extends from the right end (one end) to the left end (the other end) of the first portion 52a. Two pressure equalizing grooves 52d are provided. It is preferable that one or more pressure equalizing grooves 52d are provided. The second portion 52b is connected to the right end of the first portion 52a and has a frustum - shaped cylindrical shape whose diameter increases as it moves away from the first portion 52a. The sleeve 52 is a contact member.

[0035] The sealing member 53 is made of a synthetic resin such as polytetrafluoroethylene (PTFE), for example. The sealing member 53 has an annular plate shape. The outer diameter of the sealing member 53 is the same as the outer diameter of the diaphragm 51. The inner diameter of the sealing member 53 is larger than the outer diameter of the central portion 51a of the diaphragm 51. The sealing member 53 is disposed between the holding surface 10b of the valve body 10 and the surface (the surface facing rightward) on the differential pressure valve chamber 13 side of the outer peripheral portion 51b of the diaphragm 51.

[0036] The holding member 54 has an overall annular shape. The holding member 54 integrally has a cylindrical portion 54a and a flange portion 54b. The flange portion 54b is connected to the right end of the cylindrical portion 54a. The flange portion 54b has an annular flat surface 54c. The annular flat surface 54c is disposed on the surface (the surface facing leftward) on the first outlet 14 side of the outer peripheral portion 51b of the diaphragm 51. The cylindrical portion 54a has an outward tapered surface 54t in an annular shape. The outward tapered surface 54t is disposed at the left end of the cylindrical portion 54a. In the holding member 54, the outward tapered surface 54t is disposed on the opposite side to the annular flat surface 54c in the left - right direction (the central axis direction of the holding member 54).

[0037] The differential pressure valve frame 55 has a substantially cylindrical shape. The differential pressure valve frame 55 is disposed along the left - right direction at the first outlet 14. The differential pressure valve frame 55 integrally has a stepped peripheral wall portion 55a and a bottom wall portion 55b. The right end of the peripheral wall portion 55a is open, and the left end of the peripheral wall portion 55a is blocked by the bottom wall portion 55b.

[0038] The peripheral wall portion 55a of the differential pressure valve frame 55 has a stopper surface 55c and an inward tapered surface 55t. The stopper surface 55c is an annular flat surface facing rightward and is disposed inside the peripheral wall portion 55a. The inward tapered surface 55t is disposed at the right end of the peripheral wall portion 55a. The bottom wall portion 55b has a flow - through hole 55d.

[0039] A male thread is provided near the right end of the peripheral wall portion 55a of the differential pressure valve frame 55, and the differential pressure valve frame 55 is fixed to the valve body 10 by a screw structure. A second portion 52b of the sleeve 52 is disposed between the inward tapered surface 55t of the differential pressure valve frame 55 and the outward tapered surface 54t of the holding member 54. The differential pressure valve frame 55 presses the holding member 54 toward the holding surface 10b of the valve body 10 via the sleeve 52. As a result, the second portion 52b of the sleeve 52 is held over the entire circumference between the inward tapered surface 55t and the outward tapered surface 54t and is fixed to the valve body 10. Further, the outer peripheral portion 51b of the diaphragm 51 and the sealing member 53 are held over the entire circumference between the annular flat surface 54c of the holding member 54 and the holding surface 10b of the valve body 10. The inner space of the differential pressure valve frame 55 is connected to the first outlet 14 via the flow hole 55d and is substantially the first outlet 14.

[0040] The differential pressure valve body 56 has a substantially disc shape. The differential pressure valve body 56 is disposed in the differential pressure valve chamber 13 so as to be slidable in the left-right direction. A disc-shaped packing 56a is attached to the right end surface of the differential pressure valve body 56. The packing 56a comes into contact with and separates from the differential pressure valve seat 20. The differential pressure valve body 56 is disposed on the surface of the central portion 51a of the diaphragm 51 on the side of the differential pressure valve chamber 13.

[0041] The stopper 57 has a cylindrical shape. The stopper 57 is disposed along the left-right direction in the inner space of the differential pressure valve frame 55. The stopper 57 integrally has a peripheral wall portion 57a and a bottom wall portion 57b. The left end of the peripheral wall portion 57a is open, and the right end (one end) of the peripheral wall portion is closed by the bottom wall portion 57b. The bottom wall portion 57b is disposed on the surface of the central portion 51a of the diaphragm 51 on the side of the first outlet 14. The stopper 57 is a moving member.

[0042] The differential pressure valve body 56 and the stopper 57 are coupled to each other with the central portion 51a of the diaphragm 51 interposed therebetween. The stopper 57 is moved together with the differential pressure valve body 56. When the differential pressure valve body 56 reaches the maximum valve opening position, the left end of the peripheral wall portion 57a of the stopper 57 abuts against the stopper surface 55c of the differential pressure valve frame 55, restricting the movement of the differential pressure valve body 56 in the valve opening direction (leftward). A closing spring 58 is disposed between the bottom wall portion 57b of the stopper 57 and the bottom wall portion 55b of the differential pressure valve frame 55. The closing spring 58 is a compression coil spring and presses the differential pressure valve body 56 in the valve closing direction (rightward) via the stopper 57.

[0043] The peripheral wall portion 57a of the stopper 57 is disposed inside the first portion 52a of the sleeve 52. The outer peripheral surface 57c of the peripheral wall portion 57a is slidably in contact with the inner peripheral surface 52c of the first portion 52a. The first portion 52a of the sleeve 52 supports the stopper 57 so as to be movable in the left-right direction.

[0044] Further, the sleeve 52 divides the space S surrounded by the diaphragm 51, the holding member 54, and the differential pressure valve frame 55 into a first space portion S1 on the first outlet 14 side and a second space portion S2 on the diaphragm 51 side. The first space portion S1 is connected to the first outlet 14 via the flow hole 55d. The second space portion S2 is a space facing the diaphragm 51. Therefore, foreign matter contained in the refrigerant flowing through the first outlet 14 stays in the first space portion S1, suppressing the entry of the foreign matter into the second space portion S2. Also, the first space portion S1 and the second space portion S2 are connected by the pressure equalizing groove 52d of the sleeve 52. Thereby, the refrigerant pressure at the first outlet 14 of the diaphragm 51 is appropriately applied to the diaphragm 51.

[0045] The diaphragm 51, the sleeve 52, the sealing member 53, the holding member 54, the differential pressure valve frame 55, the differential pressure valve body 56, and the stopper 57 are arranged such that their respective central axes coincide on one straight line (i.e., coaxially).

[0046] Next, an example of the operation of the electromagnetic valve 1 will be described.

[0047] Figure 1 shows the solenoid valve 1 in a state where no current is applied to the electromagnetic coil 34. In Figure 1, the pilot valve body 36 is separated from the pilot valve seat 45, and the pilot valve seat 45 is open. Also, the main valve body 40 is separated from the main valve seat 17, and the main valve seat 17 is open. At this time, the refrigerant flowing into the main valve chamber 12 from the inlet 11 flows to the first outlet 14 through the main valve seat 17 and also flows into the differential pressure valve chamber 13 through the branch passage 18. Therefore, the differential pressure between the differential pressure valve chamber 13 and the first outlet 14 is relatively small, and as shown in Figure 2, the central portion 51a of the diaphragm 51 has a frustum shape protruding toward the differential pressure valve chamber 13 side. As a result, the differential pressure valve body 56 contacts the differential pressure valve seat 20 and closes the differential pressure valve seat 20. When the differential pressure valve seat 20 is closed, the refrigerant in the differential pressure valve chamber 13 stays in the differential pressure valve chamber 13 and does not flow to the second outlet 15.

[0048] When current is applied to the electromagnetic coil 34, the plunger 33 is attracted to the fixed core 31, and the pilot valve body 36 moves downward. Then, the pilot valve body 36 contacts the pilot valve seat 45 and pushes the main valve body 40 downward, and the main valve body 40 contacts the main valve seat 17. As a result, the pilot valve body 36 closes the pilot valve seat 45, the main valve body 40 closes the main valve seat 17, and the flow of refrigerant from the main valve chamber 12 to the first outlet 14 is blocked.

[0049] After the main valve body 40 closes the main valve seat 17 and a short time passes, the refrigerant pressure at the first outlet 14 decreases with respect to the refrigerant pressure in the differential pressure valve chamber 13. Therefore, the differential pressure between the differential pressure valve chamber 13 and the first outlet 14 becomes relatively large, and as shown in Figure 3, the central portion 51a of the diaphragm 51 deforms so as to protrude toward the first outlet 14 side. As a result, the differential pressure valve body 56 separates from the differential pressure valve seat 20 and opens the differential pressure valve seat 20. When the differential pressure valve seat 20 is opened, the refrigerant in the differential pressure valve chamber 13 flows to the second outlet 15 through the differential pressure valve seat 20 and the differential pressure valve port 19.

[0050] The diaphragm 51 deforms according to the differential pressure between the differential pressure valve chamber 13 and the first outlet 14. As the diaphragm 51 deforms, the differential pressure valve body 56 moves to open and close the differential pressure valve seat 20. Specifically, when the refrigerant pressure in the differential pressure valve chamber 13 is higher than the refrigerant pressure in the first outlet 14, the differential pressure valve seat 20 opens; when the refrigerant pressure in the differential pressure valve chamber 13 is equal to or lower than the refrigerant pressure in the first outlet 14, the differential pressure valve seat 20 closes.

[0051] For example, in a configuration without the sleeve 52, when the magnitude of the differential pressure slightly exceeds the magnitude at which the deformation of the diaphragm 51 begins: (1) when the differential pressure valve seat 20 opens, the refrigerant pressure in the differential pressure valve chamber 13 decreases and the differential pressure becomes smaller, causing the differential pressure valve seat 20 to close; (2) when the differential pressure valve seat 20 closes, the refrigerant pressure in the differential pressure valve chamber 13 increases and the differential pressure becomes larger, causing the differential pressure valve seat 20 to open. The above (1) and (2) are repeated, and there is a possibility that the differential pressure valve body 56 vibrates at high speed.

[0052] On the other hand, in a configuration with the sleeve 52, since the stopper 57 that moves together with the differential pressure valve body 56 is slidably in contact with the sleeve 52, the frictional force between the stopper 57 and the sleeve 52 serves as a resistance to the movement of the differential pressure valve body 56, and it is possible to suppress the differential pressure valve body 56 from vibrating.

[0053] As described above, the solenoid valve 1 includes a valve body 10, a main valve body 40, a diaphragm 51, a sleeve 52, a differential pressure valve body 56, and a stopper 57. The valve body 10 has an inlet 11, a main valve chamber 12 connected to the inlet 11, a first outlet 14 connected to the main valve chamber 12 via a main valve seat 17, a differential pressure valve chamber 13 connected to the main valve chamber 12 via a branch passage 18, and a second outlet 15 connected to the differential pressure valve chamber 13 via a differential pressure valve seat 20. The main valve body 40 is disposed in the main valve chamber 12. The diaphragm 51 partitions the differential pressure valve chamber 13 and the first outlet 14. The differential pressure valve body 56 is disposed in the differential pressure valve chamber 13 and is moved by the diaphragm 51. The stopper 57 is disposed at the first outlet 14 and is moved together with the differential pressure valve body 56. The sleeve 52 is made of synthetic resin and has a first portion 52a with which the stopper 57 is slidably in contact and a second portion 52b fixed to the valve body 10. Because of this configuration, a resistance force against the movement of the differential pressure valve body 56 is generated by the sleeve 52, and the vibration of the differential pressure valve body 56 can be suppressed. Further, since the sleeve 52 is fixed to the valve body 10, fluctuations in the force with which the sleeve 52 contacts the stopper 57 due to the refrigerant do not occur. Therefore, adjustment of the sleeve 52 or the like is not required, and the solenoid valve 1 can be manufactured relatively easily. Further, since the sleeve 52 is made of synthetic resin, no metal powder is generated. Therefore, damage to the diaphragm due to metal powder can be suppressed in the solenoid valve 1.

[0054] Further, the first portion 52a of the sleeve 52 has a cylindrical shape, and the second portion 52b has a frustum-shaped cylindrical shape that is connected to the right end of the first portion 52a and has a diameter that increases as it moves away from the first portion 52a. The second portion 52b is fixed to the valve body 10 over the entire circumferential direction. The stopper 57 has a cylindrical peripheral wall portion 57a and a disc-shaped bottom wall portion 57b connected to the right end of the peripheral wall portion 57a. The bottom wall portion 57b contacts the diaphragm 51. The peripheral wall portion 57a is disposed inside the first portion 52a, and the outer peripheral surface 57c of the peripheral wall portion 57a is slidably in contact with the inner peripheral surface 52c of the first portion 52a. By doing so, the sleeve 52 partitions the second space portion S2 facing the diaphragm 51 from the first outlet 14. Therefore, damage to the diaphragm 51 caused by foreign matter contained in the refrigerant flowing through the first outlet 14 can be suppressed. Further, the sleeve 52 has a simpler cylindrical shape compared to, for example, a vibration-proof spring manufactured by metal pressing, and the manufacturing cost can be reduced.

[0055] Further, a pressure equalizing groove 52d extending from the right end to the left end of the first portion 52a is provided on the inner peripheral surface 52c of the first portion 52a of the sleeve 52. By doing so, the refrigerant pressure in the second space portion S2 becomes the same as the refrigerant pressure in the first space portion S1 connected through the first outlet 14 and the flow hole 55d, and the refrigerant pressure at the first outlet 14 can be appropriately applied to the diaphragm 51. Thereby, the diaphragm 51 can function appropriately.

[0056] The solenoid valve 1 also includes an annular holding member 54 and a cylindrical differential pressure valve frame 55 that is attached to the valve body 10 and presses the holding member 54 toward the valve body 10. The holding member 54 has an annular flat surface 54c that contacts the outer peripheral portion 51b of the diaphragm 51, and an outward tapered surface 54t on the side opposite to the annular flat surface 54c. The differential pressure valve frame 55 has an inward tapered surface 55t. The second portion 52b of the sleeve 52 is held between the outward tapered surface 54t and the inward tapered surface 55t. By doing so, the differential pressure valve frame 55 presses the holding member 54 toward the valve body 10, so that the outer peripheral portion 51b of the diaphragm 51 can be held between the valve body 10 and the holding member 54, and the second portion 52b can be held between the outward tapered surface 54t and the inward tapered surface 55t. Therefore, the diaphragm 51 and the sleeve 52 can be fixed to the valve body 10 with a relatively simple configuration.

[0057] The solenoid valve 1 has a sleeve 52 as a contact member. Instead of the sleeve 52, the solenoid valve 1 may have, for example, a rectangular contact piece made of synthetic resin. In this configuration, one end (the first portion) in the longitudinal direction of the contact piece is slidably in contact with the peripheral wall portion 57a of the stopper 57, and the other end (the second portion) in the longitudinal direction of the contact piece is held between the outward tapered surface 54t and the inward tapered surface 55t and fixed to the valve body 10. The contact piece may be elastically deformed, and the first portion may be pressed against the peripheral wall portion 57a of the stopper 57 by the restoring force of the contact piece. Even in this configuration, the same (including substantially the same) operational effects as those of the solenoid valve 1 described above are achieved. Note that the contact piece may be made of metal, and for example, the contact piece may be manufactured by pressing sheet metal.

[0058] Note that the solenoid valve 1 of this embodiment is a composite valve (valve device) having a solenoid valve portion 30 and a differential pressure valve portion 50, but the present invention may be applied to a single differential pressure valve.

[0059] Although the embodiments of the present invention have been described above, the present invention is not limited to these examples. For the foregoing embodiments, those obtained by appropriately adding, deleting, or modifying components by those skilled in the art, or those obtained by appropriately combining the features of the embodiments, are included in the scope of the present invention as long as they do not depart from the spirit of the present invention.

Explanation of Reference Numerals

[0060] 1... solenoid valve with differential pressure valve, 10... valve body, 10a... left side surface, 10b... holding surface, 11... inlet, 12... main valve chamber, 13... differential pressure valve chamber, 14... first outlet, 15... second outlet, 16... main valve port, 17... main valve seat, 18... branch passage, 19... differential pressure valve port, 20... differential pressure valve seat, 30... solenoid valve section, 31... fixed core, 31a... first cylindrical section, 31b... second cylindrical section, 32... case, 33... plunger, 34... electromagnetic coil, 35... valve shaft, 35a... fluid passage, 36... pilot valve body, 36a... packing, 37... pilot valve chamber, 38... plunger spring, 39... valve opening spring, 40... main valve body, 41... body section, 42... upper flange section, 42a... pressure equalizing passage, 43... lower flange section, 43a... packing, 44... pilot passage, 45... pilot valve seat, 50... differential pressure valve section, 51... diaphragm, 51a... central section, 51b... outer peripheral section, 52... sleeve, 52a... first part, 52b... second part, 52c... inner peripheral surface, 52d... pressure equalizing groove, 53... sealing member, 54... holding member, 54a... cylindrical section, 54b... flange section, 54c... annular plane, 54t... outward taper surface, 55... differential pressure valve frame, 55a... peripheral wall section, 55b... bottom wall section, 55c... stopper surface, 55d... flow hole, 55t... inward taper surface, 56... differential pressure valve body, 56a... packing, 57... stopper, 57a... peripheral wall section, 57b... bottom wall section, 57c... outer peripheral surface, 58... valve closing spring, S... space, S1... first space part, S2... second space part

Claims

1. A differential pressure valve having a valve body with a valve chamber and a back pressure chamber, a diaphragm partitioning the valve chamber and the back pressure chamber, a valve element disposed in the valve chamber and moved by the diaphragm, and a moving member disposed in the back pressure chamber and moved together with the valve element, wherein the differential pressure valve includes a contact member having a first portion with which the moving member is slidably in contact and a second portion fixed to the valve body, the first portion has a cylindrical shape, the second portion has a frustoconical cylindrical shape connected to one end of the first portion and having a diameter increasing as it moves away from the first portion, and is fixed to the valve body over the entire circumferential direction, the moving member has a cylindrical peripheral wall portion and a disc-shaped bottom wall portion connected to one end of the peripheral wall portion, the bottom wall portion contacts the diaphragm, the peripheral wall portion is disposed inside the first portion, and an outer peripheral surface of the peripheral wall portion is slidably in contact with an inner peripheral surface of the first portion. Differential pressure valve.

2. The differential pressure valve according to claim 1, wherein an equalizing groove extending from one end to the other end of the first portion is provided on an inner peripheral surface of the first portion.

3. The differential pressure valve includes an annular holding member and a cylindrical differential pressure valve frame attached to the valve body and pressing the holding member toward the valve body, the holding member has an annular plane contacting an outer peripheral portion of the diaphragm and an outward tapered surface on a side opposite to the annular plane, the differential pressure valve frame has an inward tapered surface, The differential pressure valve according to claim 1 or claim 2, wherein the second portion is held between the outward tapered surface and the inward tapered surface.

4. A valve device having an inlet, a main valve chamber connected to the inlet, a first outlet connected to the main valve chamber via a main valve seat, a differential pressure valve chamber connected to the main valve chamber via a branch passage, and a second outlet connected to the differential pressure valve chamber via a differential pressure valve seat, a main valve element disposed in the main valve chamber, a diaphragm partitioning the differential pressure valve chamber and the first outlet, a differential pressure valve element disposed in the differential pressure valve chamber and moved by the diaphragm, and a moving member disposed in the first outlet and moved together with the differential pressure valve element, wherein the valve device includes a contact member having a first portion with which the moving member is slidably in contact and a second portion fixed to the valve body, the first portion has a cylindrical shape, The second part has a frustum-shaped cylindrical shape that is connected to one end of the first part and has a diameter that increases as it moves away from the first part, and is fixed to the valve body over the entire circumferential direction. The moving member has a cylindrical peripheral wall portion and a disk-shaped bottom wall portion connected to one end of the peripheral wall portion. The bottom wall portion contacts the diaphragm. A valve device, wherein the peripheral wall portion is disposed inside the first part, and an outer peripheral surface of the peripheral wall portion is slidably in contact with an inner peripheral surface of the first part.

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