WO2022137693A1 - Differential pressure valve and valve device having same - Google Patents

Differential pressure valve and valve device having same Download PDF

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Publication number
WO2022137693A1
WO2022137693A1 PCT/JP2021/035502 JP2021035502W WO2022137693A1 WO 2022137693 A1 WO2022137693 A1 WO 2022137693A1 JP 2021035502 W JP2021035502 W JP 2021035502W WO 2022137693 A1 WO2022137693 A1 WO 2022137693A1
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WO
WIPO (PCT)
Prior art keywords
differential pressure
valve
diaphragm
valve body
pressure valve
Prior art date
Application number
PCT/JP2021/035502
Other languages
French (fr)
Japanese (ja)
Inventor
大介 渡利
利信 山際
繁樹 伊藤
照之 堀田
智弘 高木
誠司 釘尾
Original Assignee
株式会社不二工機
株式会社デンソー
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 株式会社不二工機, 株式会社デンソー filed Critical 株式会社不二工機
Priority to CN202180079796.2A priority Critical patent/CN116507842A/en
Publication of WO2022137693A1 publication Critical patent/WO2022137693A1/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
    • F16K17/20—Excess-flow valves
    • F16K17/22—Excess-flow valves actuated by the difference of pressure between two places in the flow line
    • F16K17/24—Excess-flow valves actuated by the difference of pressure between two places in the flow line acting directly on the cutting-off member
    • F16K17/28—Excess-flow valves actuated by the difference of pressure between two places in the flow line acting directly on the cutting-off member operating in one direction only
    • F16K17/30—Excess-flow valves actuated by the difference of pressure between two places in the flow line acting directly on the cutting-off member operating in one direction only spring-loaded
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
    • F16K31/06—Actuating devices; Operating means; Releasing devices electric; magnetic using a magnet, e.g. diaphragm valves, cutting off by means of a liquid
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves

Definitions

  • the present invention relates to a differential pressure valve and a valve device having the differential pressure valve.
  • Patent Document 1 discloses a solenoid valve with a differential pressure valve, which is an example of a conventional valve device.
  • the solenoid valve of Patent Document 1 has a solenoid valve portion and a differential pressure valve portion 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 the 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.
  • the differential pressure valve body is attached to a diaphragm made of synthetic resin.
  • the diaphragm separates the differential pressure valve chamber and the first outlet as a back pressure chamber.
  • the outer peripheral portion of the diaphragm is held between the valve body and the cylindrical holding member.
  • the holding member has an inner peripheral surface and an annular plane in contact with the diaphragm, and the annular plane and the inner peripheral surface are smoothly connected by a curved connecting surface.
  • the diaphragm is deformed along the connection surface to prevent the deformed parts of the diaphragm from being concentrated in one place.
  • the differential pressure valve body is moved so as to open and close the differential pressure valve seat when the diaphragm is deformed by the differential pressure between the differential pressure valve chamber and the first outlet.
  • the solenoid valve described above is used, for example, in a heat pump system.
  • the refrigerant in the heat pump system may contain foreign matter such as solenoid valves and metal powder produced by the operation of the pump. Foreign matter may get caught between the diaphragm and the holding member when the diaphragm is deformed. This could damage the diaphragm.
  • an object of the present invention is to provide a differential pressure valve capable of suppressing damage to the diaphragm due to a foreign substance and a valve device having the differential pressure valve.
  • the differential pressure valve is a synthesis arranged so as to partition a valve body having a valve chamber and a back pressure chamber, and the valve chamber and the back pressure chamber.
  • a differential pressure valve having a resin diaphragm, an annular holding member fixed to the valve body, and a valve body arranged in the valve chamber and moved by the diaphragm. It has a ring-shaped protective sheet made of synthetic resin arranged in contact with one surface of the outer peripheral portion of the diaphragm, and the outer peripheral portion of the diaphragm and the protective sheet are held between the valve body and the holding member. It is characterized by being done.
  • the differential pressure valve has a ring-shaped protective sheet made of synthetic resin arranged in contact with one surface of the outer peripheral portion of the diaphragm.
  • the outer peripheral portion of the diaphragm and the protective sheet are held between the valve body and the holding member.
  • the central portion of the diaphragm has a conical trapezoidal shape and the valve body is attached to the central portion of the diaphragm in a state where there is no differential pressure between the valve chamber and the back pressure chamber. .. By doing so, the amount of movement of the valve body can be increased.
  • the inner diameter of the protective sheet is smaller than the outer diameter of the central portion of the diaphragm.
  • the protective sheet is arranged in contact with the surface of the outer peripheral portion of the diaphragm on the holding member side, and the holding member has an annular plane in contact with the protective sheet and a cylindrical inner peripheral surface. It is preferable that the protective sheet has a curved connecting surface that smoothly connects the annular plane and the inner peripheral surface, and the inner diameter of the protective sheet is smaller than the diameter of the inner peripheral surface of the holding member. By doing so, the protective sheet is arranged so as to face the entire connection surface, and foreign matter can be more reliably prevented from being caught between the diaphragm and the connection surface, and damage to the diaphragm can be further suppressed.
  • the differential pressure valve further includes an annular sealing member arranged in contact with the other surface of the outer peripheral portion of the diaphragm, the sealing member, the outer peripheral portion of the diaphragm, and the protective sheet. Is preferably held between the valve body and the holding member. By doing so, the valve chamber and the back pressure chamber can be effectively sealed from each other.
  • the valve device is connected to the inlet, the main valve chamber connected to the inlet, and the main valve chamber via the main valve seat.
  • a valve body having a first outlet, 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 synthetic resin diaphragm arranged in the main valve chamber so as to partition the main valve body that opens and closes the main valve seat, and the differential pressure valve chamber and the first outlet as a back pressure chamber.
  • a valve device having a ring-shaped holding member fixed to the valve body and a differential pressure valve body arranged in the differential pressure valve chamber and moved by the diaphragm, the outer circumference of the diaphragm. It has a ring-shaped protective sheet made of synthetic resin arranged in contact with one surface of the portion, and the outer peripheral portion of the diaphragm and the protective sheet are held between the valve body and the holding member. It is characterized by being.
  • the valve device has a ring-shaped protective sheet made of synthetic resin arranged in contact with one surface of the outer peripheral portion of the diaphragm.
  • the outer peripheral portion of the diaphragm and the protective sheet are held between the valve body and the holding member.
  • FIG. 3 is an enlarged cross-sectional view of a differential pressure valve portion included in the solenoid valve with a differential pressure valve of FIG. 1 (valve open state). It is an enlarged cross-sectional view of the part surrounded by the circle of the alternate long and short dash line in FIG.
  • FIG. 1 is a cross-sectional view of a solenoid valve with a differential pressure valve according to an embodiment of the present invention.
  • FIG. 2 is an enlarged cross-sectional view of a differential pressure valve portion included in the solenoid valve with a differential pressure valve of FIG.
  • FIG. 2 shows a differential pressure valve portion in a closed valve state.
  • FIG. 3 is an enlarged cross-sectional view of a portion of the alternate long and short dash line in FIG. 2 surrounded by a circle.
  • FIG. 4 is an enlarged cross-sectional view of a differential pressure valve portion included in the solenoid valve with a differential pressure valve of FIG.
  • FIG. 4 shows a differential pressure valve portion in a valve open state.
  • FIG. 1 is a cross-sectional view of a solenoid valve with a differential pressure valve according to an embodiment of the present invention.
  • FIG. 2 is an enlarged cross-sectional view of a differential pressure valve portion included in the solenoid valve with a differential pressure valve of FIG
  • FIG. 5 is an enlarged cross-sectional view of a portion of the alternate long and short dash line in FIG. 4 surrounded by a circle.
  • the term "up / down / left / right” indicates the relative positional relationship of the components described in each figure.
  • the solenoid valve 1 with a differential pressure valve (hereinafter, simply referred to as “solenoid valve 1”) of this embodiment has a valve body 10.
  • the valve body 10 is provided with a solenoid valve portion 30 and a differential pressure valve portion 50.
  • the valve body 10 has a substantially rectangular parallelepiped shape.
  • the valve body 10 has an inflow port 11, a main valve chamber 12, a differential pressure valve chamber 13, a first outlet 14, and a second outlet 15.
  • the inflow port 11 is open on the left side surface 10a of the valve body 10.
  • the inflow port 11 is connected to the main valve chamber 12.
  • a circular main valve seat 17 surrounding the main valve port 16 is arranged.
  • the main valve chamber 12 is connected to the first outlet 14 via the main valve seat 17 and the main valve port 16.
  • the first outlet 14 is open to 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 the branch passage 18.
  • a circular differential pressure valve seat 20 surrounding the differential pressure valve port 19 is arranged.
  • the differential pressure valve chamber 13 is connected to the second outlet 15 via the differential pressure valve seat 20 and the differential pressure valve port 19.
  • the second outlet 15 is open to the back surface of the valve body 10.
  • the solenoid valve portion 30 has a suction element 31 which is a fixed iron core, a can 32, a plunger 33, an electromagnetic coil 34, a valve shaft 35, a pilot valve body 36, and a main valve body 40. ..
  • the suction element 31 integrally has a large-diameter cylindrical portion 31a and a small-diameter cylindrical portion 31b connected to the upper end of the large-diameter cylindrical portion 31a.
  • the large-diameter cylindrical portion 31a is fixed to the valve body 10 with a screw structure.
  • the small-diameter cylindrical portion 31b is arranged so as to extend upward from the valve body 10.
  • the can 32 has a cylindrical shape with the upper end closed. A small-diameter cylindrical portion 31b of the suction element 31 is inserted at the lower end of the can 32. The can 32 is joined to the suction element 31.
  • the plunger 33 has a cylindrical shape having an outer diameter slightly smaller than the inner diameter of the can 32.
  • the plunger 33 is arranged inside the can 32 so as to be movable in the vertical direction.
  • a valve opening spring 38 is arranged between the plunger 33 and the small-diameter cylindrical portion 31b of the suction element 31.
  • the valve opening spring 38 is a compression coil spring and pushes the plunger 33 upward.
  • the electromagnetic coil 34 has a cylindrical shape having an inner diameter slightly larger than the outer diameter of the can 32.
  • a can 32 is inserted inside the electromagnetic coil 34.
  • the attractor 31 and the plunger 33 are magnetized by the electromagnetic force of the electromagnetic coil 34.
  • the electromagnetic coil 34 is arranged outside the can 32.
  • 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 small diameter cylindrical portion 31b of the suction element 31. The valve shaft 35 is supported by a small-diameter cylindrical portion 31b so as to be movable in the vertical direction. The valve shaft 35 has a fluid passage 35a extending from the upper end to the vicinity of the lower end.
  • the pilot valve body 36 is continuously provided at the lower end of the valve shaft 35.
  • a disk-shaped packing 36a is attached to the lower surface of the pilot valve body 36.
  • the main valve body 40 integrally has a cylindrical body portion 41, an upper flange portion 42 arranged above the body portion 41, and a lower flange portion 43 arranged below the body portion 41. ing.
  • the body portion 41 has a pilot valve port 44 penetrating from the upper end to the lower end.
  • a pilot valve seat 45 surrounding the pilot valve port 44 is arranged at the upper end of the body portion 41.
  • the upper flange portion 42 is slidably arranged in the vertical direction inside the large-diameter cylindrical portion 31a of the suction element 31.
  • the upper flange portion 42 separates the main valve chamber 12 and the pilot valve chamber 37 inside the suction element 31.
  • the upper flange portion 42 has a pressure equalizing passage 42a connecting the main valve chamber 12 and the pilot valve chamber 37.
  • An annular plate-shaped packing 43a is attached to the lower surface of the lower flange portion 43.
  • the outer diameter of the lower flange portion 43 is smaller than the outer diameter of the upper flange portion 42.
  • a valve opening spring 39 is arranged between the upper flange portion 42 of the main valve body 40 and the valve body 10.
  • the valve opening spring 39 is a compression coil spring and pushes the main valve body 40 upward.
  • the solenoid valve portion 30 is a normally open solenoid valve that opens when the electromagnetic coil 34 is not energized.
  • the solenoid valve portion 30 may be a normally closed solenoid valve that is closed when the electromagnetic coil 34 is not energized.
  • the differential pressure valve portion 50 has a diaphragm 51, a protective sheet 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.
  • the diaphragm 51 is a thin film body made of a synthetic resin such as polyimide.
  • the diaphragm 51 partitions the differential pressure valve chamber 13 and the first outflow port 14 as a back pressure chamber in the valve body 10.
  • the diaphragm 51 integrally has a central portion 51a and an outer peripheral portion 51b.
  • the central portion 51a has a conical trapezoidal shape protruding 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 continuously provided on the outer peripheral edge of the central portion 51a.
  • the conical trapezoidal shape in the present specification includes a shape in which the outer peripheral edge and the ceiling portion are connected by a smooth curved surface, such as a dome shape in which the central portion is gently raised, and the outer peripheral edge and the ceiling portion are smooth. Includes a shape composed of curved surfaces.
  • the protective sheet 52 is a thin film made of a synthetic resin such as polyimide.
  • the protective sheet 52 has an annular shape.
  • the outer diameter of the protective sheet 52 is the same as the outer diameter of the diaphragm 51.
  • the inner diameter of the protective sheet 52 is slightly smaller than the outer diameter of the central portion 51a of the diaphragm 51. By making the inner diameter of the protective sheet 52 smaller than the outer diameter of the central portion 51a, it is possible to make the deformed portion of the diaphragm different between when the valve is opened and when the valve is closed. Therefore, the durability of the diaphragm 51 is improved.
  • the inner diameter of the protective sheet 52 is the contact range between the diaphragm 51 and the stopper 57 in the valve closed state shown in FIG.
  • the protective sheet 52 is arranged in contact with the surface (one surface) on the first outlet 14 side of the outer peripheral portion 51b of the diaphragm 51.
  • the protective sheet 52 is made of the same material as the diaphragm 51 and has the same thickness as the diaphragm 51.
  • the material of the diaphragm 51 may be a synthetic resin that can be used in a refrigerant such as HFC134a or HFO1234yf.
  • the thickness of the diaphragm 51 may be a range that does not impair the deformation characteristics of the diaphragm 51.
  • the protective sheet 52 may be arranged in contact with the surface of the outer peripheral portion 51b of the diaphragm 51 on the differential pressure valve chamber 13 side. Further, in this embodiment, the inner diameter of the protective sheet 52 is slightly smaller than the outer diameter of the central portion 51a of the diaphragm 51, but the inner diameter of the protective sheet 52 and the outer diameter of the central portion 51a may be the same. Even when the inner diameter of the protective sheet 52 is larger than the outer diameter of the central portion 51a, it has the effect of suppressing damage to the diaphragm 51 due to foreign matter.
  • the sealing member 53 is made of a synthetic resin such as polytetrafluoroethylene (PTFE).
  • the sealing member 53 has an annulus plate shape having the same outer diameter as the diaphragm 51.
  • the sealing member 53 is arranged in contact with the surface (the other surface) on the differential pressure valve chamber 13 side of the outer peripheral portion 51b of the diaphragm 51.
  • the holding member 54 has an annular shape as a whole.
  • the holding member 54 integrally has a cylindrical portion 54a and a flange portion 54b.
  • the flange portion 54b is continuously provided at one end (right end in each drawing) of the cylindrical portion 54a.
  • the flange portion 54b has an annular plane 54c in contact with the protective sheet 52.
  • the annular plane 54c and the cylindrical inner peripheral surface 54d of the cylindrical portion 54a are smoothly connected by a curved connecting surface 54e.
  • the diameter of the inner peripheral surface 54d is larger than the inner diameter of the protective sheet 52.
  • a protective sheet 52, an outer peripheral portion 51b of the diaphragm 51, and a sealing member 53 are arranged between the holding member 54 and the holding surface 10b in the valve body 10.
  • the gap between the protective sheet 52 and the connecting surface 54e of the holding member 54 gradually narrows toward the outer side in the radial direction.
  • the differential pressure valve frame 55 has a cylindrical shape with one end (the left end in FIG. 1) closed. A flow hole 55a is formed at one end of the differential pressure valve frame 55. The inner space of the differential pressure valve frame 55 is connected to the first outlet 14 via the flow hole 55a. The other end of the differential pressure valve frame 55 is fitted with the cylindrical portion 54a of the holding member 54. The other end of the differential pressure valve frame 55 is fixed to the valve body 10 with a screw structure.
  • the holding member 54 is fixed to the valve body 10 by the differential pressure valve frame 55.
  • the differential pressure valve frame 55 presses the holding member 54 against the holding surface 10b side of the valve body 10. As a result, the protective sheet 52, the outer peripheral portion 51b of the diaphragm 51, and the sealing member 53 are held between the holding member 54 and the holding surface 10b of the valve body in a state of being overlapped with each other.
  • the differential pressure valve body 56 has a substantially disk shape.
  • the differential pressure valve body 56 is slidably arranged in the differential pressure valve chamber 13 in the left-right direction.
  • a disk-shaped packing 56a is attached to one end surface (right end surface in FIG. 1) of the differential pressure valve body 56.
  • the differential pressure valve body 56 is attached to the central portion 51a of the diaphragm 51. Specifically, the differential pressure valve body 56 and the stopper 57 are coupled to each other, and the central portion 51a is held between the differential pressure valve body 56 and the stopper 57.
  • the stopper 57 is arranged inside the differential pressure valve frame 55.
  • a valve closing spring 58 is arranged between the stopper 57 and the differential pressure valve frame 55.
  • the valve closing spring 58 is a compression coil spring and pushes the differential pressure valve body 56 to the right (valve closing direction) via the stopper 57.
  • FIG. 1 shows a solenoid valve 1 in a state where the solenoid coil 34 is not energized.
  • the pilot valve body 36 (specifically, the packing 36a) is separated from the pilot valve seat 45, and the pilot valve seat 45 is open.
  • the main valve body 40 (specifically, the packing 43a) is separated from the main valve seat 17, and the main valve seat 17 is open.
  • the refrigerant flowing from the inflow port 11 into the main valve chamber 12 flows to the first outflow port 14 through the main valve seat 17 and the main valve port 16, and also flows to the differential pressure valve chamber 13 through the branch passage 18. .. Therefore, the pressure difference between the differential pressure valve chamber 13 and the first outlet 14 is relatively small, and as shown in FIGS.
  • the central portion 51a of the diaphragm 51 has a conical trapezoidal shape protruding toward the differential pressure valve chamber 13. ..
  • the differential pressure valve body 56 (specifically, the packing 56a) comes into contact with the differential pressure valve seat 20 and closes the differential pressure valve seat 20.
  • 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.
  • the plunger 33 is attracted to the attractor 31 and the pilot valve body 36 moves downward.
  • the pilot valve body 36 comes into contact with the pilot valve seat 45 and pushes the main valve body 40 downward, and the main valve body 40 comes into contact with the main valve seat 17.
  • 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 the refrigerant from the main valve chamber 12 to the first outlet 14 is cut off.
  • the differential pressure valve body 56 separates from the differential pressure valve seat 20 and opens the differential pressure valve seat 20.
  • the differential pressure valve seat 20 is opened, the refrigerant in the differential pressure valve chamber 13 flows to the second outlet 15 via the differential pressure valve seat 20 and the differential pressure valve port 19.
  • the gap between the protective sheet 52 and the connecting surface 54e of the holding member 54 becomes smaller.
  • foreign matter that has entered the gap may be caught between the protective sheet 52 and the holding member 54.
  • the protective sheet 52 is arranged so as to overlap the outer peripheral portion 51b of the diaphragm 51 to prevent foreign matter from directly contacting the diaphragm 51.
  • the plunger 33 is pushed upward by the valve opening spring 38, the pilot valve body 36 is separated from the pilot valve seat 45, and the pilot valve seat 45 is opened.
  • the refrigerant in the pilot valve chamber 37 flows to the first outlet 14 through the pilot valve seat 45 and the pilot valve port 44, and the force of the refrigerant pressing the main valve body 40 against the main valve seat 17 is weakened.
  • the main valve body 40 is pushed upward by the valve opening spring 39, and the main valve body 40 separates from the main valve seat 17 and opens the main valve seat 17.
  • the refrigerant in the main valve chamber 12 flows to the first outlet 14 through the main valve seat 17 and the main valve port 16.
  • the pressure difference between the differential pressure valve chamber 13 and the first outlet 14 becomes relatively small, and as shown in FIGS. 2 and 3, the central portion 51a of the diaphragm 51 has a conical trapezoidal shape protruding toward the differential pressure valve chamber 13. Return. As a result, the differential pressure valve body 56 comes into contact with the differential pressure valve seat 20 and closes the differential pressure valve seat 20.
  • the solenoid valve 1 includes an inflow port 11, a main valve chamber 12 connected to the inflow port 11, and a first outlet 14 connected to the main valve chamber 12 via a main valve seat 17.
  • a valve body 10 having 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 solenoid valve 1 is arranged in the main valve chamber 12, and is a synthetic resin diaphragm arranged so as to partition the main valve body 40 that opens and closes the main valve seat 17, and the differential pressure valve chamber 13 and the first outlet 14.
  • the solenoid valve 1 has a ring-shaped protective sheet 52 made of synthetic resin arranged in contact with the surface of the first outlet 14 side (that is, the holding member 54 side) of the outer peripheral portion 51b of the diaphragm 51.
  • the outer peripheral portion 51b of the diaphragm 51 and the protective sheet 52 are held between the holding surface 10b of the valve body and the holding member 54.
  • the central portion 51a of the diaphragm 51 has a conical trapezoidal shape in a state where there is no differential pressure between the differential pressure valve chamber 13 and the first outlet 14.
  • the differential pressure valve body 56 is attached to the central portion 51a of the diaphragm 51. By doing so, the amount of movement of the differential pressure valve body 56 can be increased.
  • the holding member 54 has a curved connecting surface 54e that smoothly connects the annular plane 54c in contact with the protective sheet 52, the cylindrical inner peripheral surface 54d, and the annular plane 54c and the inner peripheral surface 54d. have.
  • the inner diameter of the protective sheet 52 is smaller than the diameter of the inner peripheral surface 54d of the holding member 54.
  • the protective sheet 52 is arranged so as to face the entire connecting surface 54e, more reliably avoiding foreign matter from being caught between the diaphragm 51 and the connecting surface 54e, and further damaging the diaphragm 51. Can be suppressed.
  • the solenoid valve 1 has an annular sealing member 53 arranged so as to be overlapped with the surface of the differential pressure valve chamber 13 side (that is, the valve body 10 side) in the outer peripheral portion 51b of the diaphragm 51.
  • the sealing member 53, the outer peripheral portion 51b of the diaphragm 51, and the protective sheet 52 are held between the holding surface 10b of the valve body and the holding member 54.
  • the solenoid valve 1 of the present embodiment is a composite valve having a solenoid valve portion 30 and a differential pressure valve portion 50, the present invention may be applied to a single differential pressure valve.
  • Electromagnetic 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 ... No. 2 outlets, 16 ... main valve port, 17 ... main valve seat, 18 ... branch passage, 19 ... differential pressure valve port, 20 ... differential pressure valve seat, 30 ... electromagnetic valve part, 31 ... suction element, 31a ... large diameter cylindrical part , 31b ... Small diameter cylindrical part, 32 ... Can, 33 ... Flange, 34 ... Electromagnetic coil, 35 ... Valve shaft, 35a ... Fluid passage, 36 ... Pilot valve body, 36a ...

Abstract

[Problem] To provide a differential pressure valve capable of inhibiting diaphragm damage caused by foreign matter, and a valve device having the same. [Solution] A valve body (10) of a solenoid valve (1), the valve body (10) having: a main valve chamber (12); a first outflow port (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 outflow port (15) connected to the differential pressure valve chamber (13) via a differential pressure valve seat (20). The solenoid valve (1) has: a synthetic resin diaphragm (51) that partitions the first outflow port (14) and the differential pressure valve chamber (13) in the valve body (10); and an annularly-shaped retaining member (54) that is fixed to the valve body (10). The periphery (51b) of the diaphragm (51) has an annularly-shaped synthetic resin protective sheet (52) that is arranged so as to overlap the surface thereof on the retaining member (54)-side. The periphery (51b) of the diaphragm (51) and protective sheet (52) are retained between the valve body (10) and the retaining member (54).

Description

差圧弁およびそれを有する弁装置Differential pressure valve and valve device having it
　本発明は、差圧弁およびその差圧弁を有する弁装置に関する。 The present invention relates to a differential pressure valve and a valve device having the differential pressure valve.
　従来の弁装置の一例である差圧弁付電磁弁が特許文献１に開示されている。特許文献１の電磁弁は、１つの弁本体に電磁弁部と差圧弁部とを有している。弁本体は、主弁室と、差圧弁室と、流入口と、第１流出口と、第２流出口と、を有している。流入口は、主弁室に接続されている。主弁室は、主弁座を介して第１流出口に接続されている。主弁室は、分岐通路を介して差圧弁室にも接続されている。差圧弁室は、差圧弁座を介して第２流出口に接続されている。電磁弁部は、主弁座を開閉する主弁体を有している。差圧弁部は、差圧弁座を開閉する差圧弁体を有している。 Patent Document 1 discloses a solenoid valve with a differential pressure valve, which is an example of a conventional valve device. The solenoid valve of Patent Document 1 has a solenoid valve portion and a differential pressure valve portion 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 the 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.
　差圧弁体は、合成樹脂製のダイアフラムに取り付けられている。ダイアフラムは、差圧弁室と背圧室としての第１流出口とを区画している。ダイアフラムの外周部は、弁本体と円筒形状の保持部材との間に保持されている。保持部材は、内周面とダイアフラムに接する円環平面とを有しており、円環平面と内周面とが曲面形状の接続面で滑らかに接続されている。電磁弁では、接続面に沿うようにダイアフラムが変形して、ダイアフラムの変形箇所が一箇所に集中することを防いでいる。差圧弁体は、差圧弁室と第１流出口との差圧でダイアフラムが変形すると、差圧弁座を開閉するように移動される。 The differential pressure valve body is attached to a diaphragm made of synthetic resin. The diaphragm separates the differential pressure valve chamber and the first outlet as a back pressure chamber. The outer peripheral portion of the diaphragm is held between the valve body and the cylindrical holding member. The holding member has an inner peripheral surface and an annular plane in contact with the diaphragm, and the annular plane and the inner peripheral surface are smoothly connected by a curved connecting surface. In the solenoid valve, the diaphragm is deformed along the connection surface to prevent the deformed parts of the diaphragm from being concentrated in one place. The differential pressure valve body is moved so as to open and close the differential pressure valve seat when the diaphragm is deformed by the differential pressure between the differential pressure valve chamber and the first outlet.
特開２０１４－１５２８４８号公報Japanese Unexamined Patent Publication No. 2014-152948
　上述した電磁弁は、例えば、ヒートポンプシステムで用いられる。ヒートポンプシステムの冷媒には、電磁弁やポンプの動作によって生じた金属粉などの異物が含まれていることがある。異物は、ダイアフラムが変形した際に、ダイアフラムと保持部材との間に挟まってしまうことがある。これにより、ダイアフラムが損傷してしまうおそれがあった。 The solenoid valve described above is used, for example, in a heat pump system. The refrigerant in the heat pump system may contain foreign matter such as solenoid valves and metal powder produced by the operation of the pump. Foreign matter may get caught between the diaphragm and the holding member when the diaphragm is deformed. This could damage the diaphragm.
　そこで、本発明は、異物によるダイアフラムの損傷を抑制できる差圧弁およびそれを有する弁装置を提供することを目的とする。 Therefore, an object of the present invention is to provide a differential pressure valve capable of suppressing damage to the diaphragm due to a foreign substance and a valve device having the differential pressure valve.
　上記目的を達成するために、本発明の一態様に係る差圧弁は、弁室と背圧室とを有する弁本体と、前記弁室と前記背圧室とを区画するように配置された合成樹脂製のダイアフラムと、前記弁本体に対して固定された円環形状の保持部材と、前記弁室に配置され、前記ダイアフラムによって移動される弁体と、を有する差圧弁であって、前記ダイアフラムの外周部の一方の面に接して配置された合成樹脂製の円環形状の保護シートを有し、前記ダイアフラムの外周部および前記保護シートが、前記弁本体と前記保持部材との間に保持されていることを特徴とする。 In order to achieve the above object, the differential pressure valve according to one aspect of the present invention is a synthesis arranged so as to partition a valve body having a valve chamber and a back pressure chamber, and the valve chamber and the back pressure chamber. A differential pressure valve having a resin diaphragm, an annular holding member fixed to the valve body, and a valve body arranged in the valve chamber and moved by the diaphragm. It has a ring-shaped protective sheet made of synthetic resin arranged in contact with one surface of the outer peripheral portion of the diaphragm, and the outer peripheral portion of the diaphragm and the protective sheet are held between the valve body and the holding member. It is characterized by being done.
　本発明によれば、差圧弁が、ダイアフラムの外周部の一方の面に接して配置された合成樹脂製の円環形状の保護シートを有している。そして、ダイアフラムの外周部および保護シートが、弁本体と保持部材との間に保持されている。このようにしたことから、ダイアフラムが変形した際に、弁本体または保持部材と保護シートとの間に異物が挟まり、ダイアフラムに異物が直接的に接触することを防ぐことができる。そのため、差圧弁において、ダイアフラムの損傷を抑制できる。 According to the present invention, the differential pressure valve has a ring-shaped protective sheet made of synthetic resin arranged in contact with one surface of the outer peripheral portion of the diaphragm. The outer peripheral portion of the diaphragm and the protective sheet are held between the valve body and the holding member. As a result, when the diaphragm is deformed, it is possible to prevent foreign matter from being caught between the valve body or the holding member and the protective sheet, and the foreign matter from coming into direct contact with the diaphragm. Therefore, damage to the diaphragm can be suppressed in the differential pressure valve.
　本発明において、前記弁室と前記背圧室との差圧がない状態で前記ダイアフラムの中央部が円錐台形状であり、前記弁体が、前記ダイアフラムの中央部に取り付けられていることが好ましい。このようにすることで、弁体の移動量を大きくすることができる。 In the present invention, it is preferable that the central portion of the diaphragm has a conical trapezoidal shape and the valve body is attached to the central portion of the diaphragm in a state where there is no differential pressure between the valve chamber and the back pressure chamber. .. By doing so, the amount of movement of the valve body can be increased.
　本発明において、前記保護シートの内径が、前記ダイアフラムの中央部の外径より小さいことが好ましい。このようにすることで、ダイアフラムの変形箇所を開弁時と閉弁時とで異なる箇所にでき、ダイアフラムの耐久性が向上する。 In the present invention, it is preferable that the inner diameter of the protective sheet is smaller than the outer diameter of the central portion of the diaphragm. By doing so, the deformed portion of the diaphragm can be formed at a different location when the valve is opened and when the valve is closed, and the durability of the diaphragm is improved.
　本発明において、前記保護シートが、前記ダイアフラムの外周部における前記保持部材側の面に接して配置され、前記保持部材が、前記保護シートに接する円環平面と、円筒形状の内周面と、前記円環平面と前記内周面とを滑らかに接続する曲面形状の接続面と、を有し、前記保護シートの内径が、前記保持部材の内周面の径より小さいことが好ましい。このようにすることで、保護シートが接続面全体と向かい合うように配置され、ダイアフラムと接続面との間に異物が挟まることをより確実に回避して、ダイアフラムの損傷をさらに抑制できる。 In the present invention, the protective sheet is arranged in contact with the surface of the outer peripheral portion of the diaphragm on the holding member side, and the holding member has an annular plane in contact with the protective sheet and a cylindrical inner peripheral surface. It is preferable that the protective sheet has a curved connecting surface that smoothly connects the annular plane and the inner peripheral surface, and the inner diameter of the protective sheet is smaller than the diameter of the inner peripheral surface of the holding member. By doing so, the protective sheet is arranged so as to face the entire connection surface, and foreign matter can be more reliably prevented from being caught between the diaphragm and the connection surface, and damage to the diaphragm can be further suppressed.
　本発明において、前記差圧弁が、前記ダイアフラムの外周部の他方の面に接して配置された円環形状の封止部材をさらに有し、前記封止部材、前記ダイアフラムの外周部および前記保護シートが、前記弁本体と前記保持部材との間に保持されていることが好ましい。このようにすることで、弁室と背圧室とを互いに効果的に密閉できる。 In the present invention, the differential pressure valve further includes an annular sealing member arranged in contact with the other surface of the outer peripheral portion of the diaphragm, the sealing member, the outer peripheral portion of the diaphragm, and the protective sheet. Is preferably held between the valve body and the holding member. By doing so, the valve chamber and the back pressure chamber can be effectively sealed from each other.
　上記目的を達成するために、本発明の他の一態様に係る弁装置は、流入口と、前記流入口に接続された主弁室と、前記主弁室に主弁座を介して接続された第１流出口と、前記主弁室に分岐通路を介して接続された差圧弁室と、前記差圧弁室に差圧弁座を介して接続された第２流出口と、を有する弁本体と、前記主弁室に配置され、前記主弁座を開閉する主弁体と、前記差圧弁室と背圧室としての前記第１流出口とを区画するように配置された合成樹脂製のダイアフラムと、前記弁本体に対して固定された円環形状の保持部材と、前記差圧弁室に配置され、前記ダイアフラムによって移動される差圧弁体と、を有する弁装置であって、前記ダイアフラムの外周部の一方の面に接して配置された合成樹脂製の円環形状の保護シートを有し、前記ダイアフラムの外周部および前記保護シートが、前記弁本体と前記保持部材との間に保持されていることを特徴とする。 In order to achieve the above object, the valve device according to another aspect of the present invention is connected to the inlet, the main valve chamber connected to the inlet, and the main valve chamber via the main valve seat. A valve body having a first outlet, 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 synthetic resin diaphragm arranged in the main valve chamber so as to partition the main valve body that opens and closes the main valve seat, and the differential pressure valve chamber and the first outlet as a back pressure chamber. A valve device having a ring-shaped holding member fixed to the valve body and a differential pressure valve body arranged in the differential pressure valve chamber and moved by the diaphragm, the outer circumference of the diaphragm. It has a ring-shaped protective sheet made of synthetic resin arranged in contact with one surface of the portion, and the outer peripheral portion of the diaphragm and the protective sheet are held between the valve body and the holding member. It is characterized by being.
　本発明によれば、弁装置が、ダイアフラムの外周部の一方の面に接して配置された合成樹脂製の円環形状の保護シートを有している。そして、ダイアフラムの外周部および保護シートが、弁本体と保持部材との間に保持されている。このようにしたことから、ダイアフラムが変形した際に、弁本体または保持部材と保護シートとの間に異物が挟まり、ダイアフラムに異物が直接的に接触することを防ぐことができる。そのため、弁装置において、ダイアフラムの損傷を抑制できる。 According to the present invention, the valve device has a ring-shaped protective sheet made of synthetic resin arranged in contact with one surface of the outer peripheral portion of the diaphragm. The outer peripheral portion of the diaphragm and the protective sheet are held between the valve body and the holding member. As a result, when the diaphragm is deformed, it is possible to prevent foreign matter from being caught between the valve body or the holding member and the protective sheet, and the foreign matter from coming into direct contact with the diaphragm. Therefore, damage to the diaphragm can be suppressed in the valve device.
　本発明によれば、異物によるダイアフラムの損傷を抑制できる。 According to the present invention, damage to the diaphragm due to foreign matter can be suppressed.
本発明の一実施例に係る差圧弁付電磁弁の断面図である。It is sectional drawing of the solenoid valve with a differential pressure valve which concerns on one Embodiment of this invention. 図１の差圧弁付電磁弁が有する差圧弁部の拡大断面図である（閉弁状態）。It is an enlarged sectional view of the differential pressure valve part which the solenoid valve with a differential pressure valve of FIG. 1 has (the valve closed state). 図２における一点鎖線の円で囲った箇所の拡大断面図である。It is an enlarged cross-sectional view of the part surrounded by the circle of the alternate long and short dash line in FIG. 図１の差圧弁付電磁弁が有する差圧弁部の拡大断面図である（開弁状態）。FIG. 3 is an enlarged cross-sectional view of a differential pressure valve portion included in the solenoid valve with a differential pressure valve of FIG. 1 (valve open state). 図４における一点鎖線の円で囲った箇所の拡大断面図である。It is an enlarged cross-sectional view of the part surrounded by the circle of the alternate long and short dash line in FIG.
　以下、本発明の弁装置の一実施例に係る差圧弁付電磁弁について、図１～図５を参照して説明する。 Hereinafter, the solenoid 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.
　図１は、本発明の一実施例に係る差圧弁付電磁弁の断面図である。図２は、図１の差圧弁付電磁弁が有する差圧弁部の拡大断面図である。図２は、閉弁状態の差圧弁部を示す。図３は、図２における一点鎖線の円で囲った箇所の拡大断面図である。図４は、図１の差圧弁付電磁弁が有する差圧弁部の拡大断面図である。図４は、開弁状態の差圧弁部を示す。図５は、図４における一点鎖線の円で囲った箇所の拡大断面図である。以下の説明において、「上下左右」との用語は、各図に記載の構成要素の相対的な位置関係を示している。 FIG. 1 is a cross-sectional view of a solenoid valve with a differential pressure valve according to an embodiment of the present invention. FIG. 2 is an enlarged cross-sectional view of a differential pressure valve portion included in the solenoid valve with a differential pressure valve of FIG. FIG. 2 shows a differential pressure valve portion in a closed valve state. FIG. 3 is an enlarged cross-sectional view of a portion of the alternate long and short dash line in FIG. 2 surrounded by a circle. FIG. 4 is an enlarged cross-sectional view of a differential pressure valve portion included in the solenoid valve with a differential pressure valve of FIG. FIG. 4 shows a differential pressure valve portion in a valve open state. FIG. 5 is an enlarged cross-sectional view of a portion of the alternate long and short dash line in FIG. 4 surrounded by a circle. In the following description, the term "up / down / left / right" indicates the relative positional relationship of the components described in each figure.
　図１～図５に示すように、本実施例の差圧弁付電磁弁１（以下、単に「電磁弁１」という。）は、弁本体１０を有している。弁本体１０には、電磁弁部３０と、差圧弁部５０と、が設けられている。 As shown in FIGS. 1 to 5, the solenoid valve 1 with a differential pressure valve (hereinafter, simply referred to as “solenoid valve 1”) of this embodiment has a valve body 10. The valve body 10 is provided with a solenoid valve portion 30 and a differential pressure valve portion 50.
　弁本体１０は、略直方体形状を有している。弁本体１０は、流入口１１と、主弁室１２と、差圧弁室１３と、第１流出口１４と、第２流出口１５と、を有している。 The valve body 10 has a substantially rectangular parallelepiped shape. The valve body 10 has an inflow port 11, a main valve chamber 12, a differential pressure valve chamber 13, a first outlet 14, and a second outlet 15.
　流入口１１は、弁本体１０の左側面１０ａに開口している。流入口１１は、主弁室１２に接続されている。主弁室１２には、主弁口１６を囲む円形の主弁座１７が配置されている。主弁室１２は、主弁座１７および主弁口１６を介して第１流出口１４に接続されている。第１流出口１４は、弁本体１０の左側面１０ａに開口している。主弁室１２は、分岐通路１８を介して差圧弁室１３にも接続されている。差圧弁室１３には、差圧弁口１９を囲む円形の差圧弁座２０が配置されている。差圧弁室１３は、差圧弁座２０および差圧弁口１９を介して第２流出口１５に接続されている。第２流出口１５は、弁本体１０の背面に開口している。 The inflow port 11 is open on the left side surface 10a of the valve body 10. The inflow port 11 is connected to the main valve chamber 12. In the main valve chamber 12, a circular main valve seat 17 surrounding the main valve port 16 is arranged. The main valve chamber 12 is connected to the first outlet 14 via the main valve seat 17 and the main valve port 16. The first outlet 14 is open to 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 the branch passage 18. In the differential pressure valve chamber 13, a circular differential pressure valve seat 20 surrounding the differential pressure valve port 19 is arranged. The differential pressure valve chamber 13 is connected to the second outlet 15 via the differential pressure valve seat 20 and the differential pressure valve port 19. The second outlet 15 is open to the back surface of the valve body 10.
　電磁弁部３０は、固定鉄心である吸引子３１と、キャン３２と、プランジャ３３と、電磁コイル３４と、弁軸３５と、パイロット弁体３６と、主弁体４０と、を有している。 The solenoid valve portion 30 has a suction element 31 which is a fixed iron core, a can 32, a plunger 33, an electromagnetic coil 34, a valve shaft 35, a pilot valve body 36, and a main valve body 40. ..
　吸引子３１は、大径円筒部３１ａと、大径円筒部３１ａの上端に連設された小径円筒部３１ｂと、を一体的に有している。大径円筒部３１ａは、弁本体１０にねじ構造で固定されている。小径円筒部３１ｂは、弁本体１０から上方に向けて延びるように配置されている。 The suction element 31 integrally has a large-diameter cylindrical portion 31a and a small-diameter cylindrical portion 31b connected to the upper end of the large-diameter cylindrical portion 31a. The large-diameter cylindrical portion 31a is fixed to the valve body 10 with a screw structure. The small-diameter cylindrical portion 31b is arranged so as to extend upward from the valve body 10.
　キャン３２は、上端が塞がれた円筒形状を有している。キャン３２の下端には、吸引子３１の小径円筒部３１ｂが挿入されている。キャン３２は、吸引子３１に接合されている。 The can 32 has a cylindrical shape with the upper end closed. A small-diameter cylindrical portion 31b of the suction element 31 is inserted at the lower end of the can 32. The can 32 is joined to the suction element 31.
　プランジャ３３は、キャン３２の内径よりわずかに小さい外径を有する円筒形状を有している。プランジャ３３は、キャン３２の内側に上下方向に移動可能に配置されている。プランジャ３３と吸引子３１の小径円筒部３１ｂとの間には、開弁ばね３８が配置されている。開弁ばね３８は、圧縮コイルばねであり、プランジャ３３を上方に向けて押している。 The plunger 33 has a cylindrical shape having an outer diameter slightly smaller than the inner diameter of the can 32. The plunger 33 is arranged inside the can 32 so as to be movable in the vertical direction. A valve opening spring 38 is arranged between the plunger 33 and the small-diameter cylindrical portion 31b of the suction element 31. The valve opening spring 38 is a compression coil spring and pushes the plunger 33 upward.
　電磁コイル３４は、キャン３２の外径よりわずかに大きい内径を有する円筒形状を有している。電磁コイル３４の内側には、キャン３２が挿入される。電磁コイル３４の電磁力によって吸引子３１およびプランジャ３３が磁化される。電磁コイル３４は、キャン３２の外側に配置されている。 The electromagnetic coil 34 has a cylindrical shape having an inner diameter slightly larger than the outer diameter of the can 32. A can 32 is inserted inside the electromagnetic coil 34. The attractor 31 and the plunger 33 are magnetized by the electromagnetic force of the electromagnetic coil 34. The electromagnetic coil 34 is arranged outside the can 32.
　弁軸３５は、細長い円筒形状を有している。弁軸３５の上端は、プランジャ３３に固定されている。弁軸３５は、吸引子３１の小径円筒部３１ｂに挿入されている。弁軸３５は、小径円筒部３１ｂによって上下方向に移動可能に支持されている。弁軸３５は、上端から下端近傍まで延在する流体通路３５ａを有している。 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 small diameter cylindrical portion 31b of the suction element 31. The valve shaft 35 is supported by a small-diameter cylindrical portion 31b so as to be movable in the vertical direction. The valve shaft 35 has a fluid passage 35a extending from the upper end to the vicinity of the lower end.
　パイロット弁体３６は、弁軸３５の下端に連設されている。パイロット弁体３６の下面には、円板形状のパッキン３６ａが取り付けられている。 The pilot valve body 36 is continuously provided at the lower end of the valve shaft 35. A disk-shaped packing 36a is attached to the lower surface of the pilot valve body 36.
　主弁体４０は、円柱形状の胴部４１と、胴部４１の上部に配置された上フランジ部４２と、胴部４１の下部に配置された下フランジ部４３と、を一体的に有している。胴部４１は、上端から下端まで貫通するパイロット弁口４４を有している。胴部４１の上端には、パイロット弁口４４を囲むパイロット弁座４５が配置されている。上フランジ部４２は、吸引子３１の大径円筒部３１ａの内側に上下方向に摺動可能に配置されている。上フランジ部４２は、主弁室１２と吸引子３１の内側のパイロット弁室３７とを区画している。上フランジ部４２は、主弁室１２とパイロット弁室３７とを接続する均圧通路４２ａを有している。下フランジ部４３の下面には、円環板形状のパッキン４３ａが取り付けられている。下フランジ部４３の外径は、上フランジ部４２の外径より小さい。主弁体４０の上フランジ部４２と弁本体１０との間には、開弁ばね３９が配置されている。開弁ばね３９は、圧縮コイルばねであり、主弁体４０を上方に向けて押している。 The main valve body 40 integrally has a cylindrical body portion 41, an upper flange portion 42 arranged above the body portion 41, and a lower flange portion 43 arranged below the body portion 41. ing. The body portion 41 has a pilot valve port 44 penetrating from the upper end to the lower end. A pilot valve seat 45 surrounding the pilot valve port 44 is arranged at the upper end of the body portion 41. The upper flange portion 42 is slidably arranged in the vertical direction inside the large-diameter cylindrical portion 31a of the suction element 31. The upper flange portion 42 separates the main valve chamber 12 and the pilot valve chamber 37 inside the suction element 31. The upper flange portion 42 has a pressure equalizing passage 42a connecting the main valve chamber 12 and the pilot valve chamber 37. An annular plate-shaped packing 43a is attached to the lower surface of the lower flange portion 43. The outer diameter of the lower flange portion 43 is smaller than the outer diameter of the upper flange portion 42. A valve opening spring 39 is arranged between the upper flange portion 42 of the main valve body 40 and the valve body 10. The valve opening spring 39 is a compression coil spring and pushes the main valve body 40 upward.
　電磁弁部３０は、電磁コイル３４に通電していないときに開弁状態となるノーマルオープン形電磁弁である。電磁弁部３０は、電磁コイル３４に通電していないときに閉弁状態となるノーマルクローズ形電磁弁であってもよい。 The solenoid valve portion 30 is a normally open solenoid valve that opens when the electromagnetic coil 34 is not energized. The solenoid valve portion 30 may be a normally closed solenoid valve that is closed when the electromagnetic coil 34 is not energized.
　差圧弁部５０は、ダイアフラム５１と、保護シート５２と、封止部材５３と、保持部材５４と、差圧弁枠５５と、差圧弁体５６と、ストッパ５７と、を有している。 The differential pressure valve portion 50 has a diaphragm 51, a protective sheet 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.
　ダイアフラム５１は、例えば、ポリイミドなどの合成樹脂製の薄膜体である。ダイアフラム５１は、弁本体１０内において差圧弁室１３と背圧室としての第１流出口１４とを区画している。ダイアフラム５１は、中央部５１ａと、外周部５１ｂと、を一体的に有している。中央部５１ａは、差圧弁室１３と第１流出口１４との差圧がない状態で差圧弁室１３側に突出する円錐台形状となる。外周部５１ｂは、円環形状を有している。外周部５１ｂの内周縁は、中央部５１ａの外周縁に連設されている。図３において、中央部５１ａと外周部５１ｂとの境界を矢印Ａで示す。なお、本明細書における円錐台形状は、例えば中央部分が緩やかに隆起したドーム形状のように、外周縁や天井部分が滑らかな湾曲面で連結された形状、および、外周縁や天井部分が滑らかな湾曲面で構成された形状を含む。 The diaphragm 51 is a thin film body made of a synthetic resin such as polyimide. The diaphragm 51 partitions the differential pressure valve chamber 13 and the first outflow port 14 as a back pressure chamber in the valve body 10. The diaphragm 51 integrally has a central portion 51a and an outer peripheral portion 51b. The central portion 51a has a conical trapezoidal shape protruding 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 continuously provided on the outer peripheral edge of the central portion 51a. In FIG. 3, the boundary between the central portion 51a and the outer peripheral portion 51b is indicated by an arrow A. The conical trapezoidal shape in the present specification includes a shape in which the outer peripheral edge and the ceiling portion are connected by a smooth curved surface, such as a dome shape in which the central portion is gently raised, and the outer peripheral edge and the ceiling portion are smooth. Includes a shape composed of curved surfaces.
　保護シート５２は、例えば、ポリイミドなどの合成樹脂製の薄膜体である。保護シート５２は、円環形状を有している。保護シート５２の外径は、ダイアフラム５１の外径と同じである。保護シート５２の内径は、ダイアフラム５１の中央部５１ａの外径より僅かに小さい。保護シート５２の内径を中央部５１ａの外径より小さくすることで、ダイアフラムの変形箇所を開弁時と閉弁時とで異なる箇所にできる。そのため、ダイアフラム５１の耐久性が向上する。保護シート５２の内径は、保護シート５２の内周部がストッパ５７とダイアフラム５１との間に挟まれないように、図３に示す閉弁状態でのダイアフラム５１とストッパ５７との当接範囲（当接面）よりも大きいことが望ましい。このようにすることで、保護シート５２の内周部がダイアフラム５１の中央部５１ａに重なることを防ぎ、差圧に対するダイアフラム５１の変形特性が変化してしまうことを抑制できる。保護シート５２は、ダイアフラム５１の外周部５１ｂにおける第１流出口１４側の面（一方の面）に接して配置されている。なお、本実施例において、保護シート５２は、ダイアフラム５１と同じ材料で構成されており、ダイアフラム５１と同じ厚さを有する。ダイアフラム５１の材質は冷媒、例えばＨＦＣ１３４ａあるいはＨＦＯ１２３４ｙｆ中で使用可能な合成樹脂製であればよい。ダイアフラム５１の厚さはダイアフラム５１の変形特性を損なわない範囲のものであればよい。保護シート５２は、ダイアフラム５１の外周部５１ｂにおける差圧弁室１３側の面に接して配置されていてもよい。また、本実施例では、保護シート５２の内径がダイアフラム５１の中央部５１ａの外径より僅かに小さいが、保護シート５２の内径と中央部５１ａの外径とが同一であってもよい。なお、保護シート５２の内径を中央部５１ａの外径より大きくした場合であっても、異物によるダイアフラム５１の損傷を抑制する効果は有している。 The protective sheet 52 is a thin film made of a synthetic resin such as polyimide. The protective sheet 52 has an annular shape. The outer diameter of the protective sheet 52 is the same as the outer diameter of the diaphragm 51. The inner diameter of the protective sheet 52 is slightly smaller than the outer diameter of the central portion 51a of the diaphragm 51. By making the inner diameter of the protective sheet 52 smaller than the outer diameter of the central portion 51a, it is possible to make the deformed portion of the diaphragm different between when the valve is opened and when the valve is closed. Therefore, the durability of the diaphragm 51 is improved. The inner diameter of the protective sheet 52 is the contact range between the diaphragm 51 and the stopper 57 in the valve closed state shown in FIG. 3 so that the inner peripheral portion of the protective sheet 52 is not sandwiched between the stopper 57 and the diaphragm 51. It is desirable that it is larger than the contact surface). By doing so, it is possible to prevent the inner peripheral portion of the protective sheet 52 from overlapping the central portion 51a of the diaphragm 51, and to prevent the deformation characteristics of the diaphragm 51 from changing with respect to the differential pressure. The protective sheet 52 is arranged in contact with the surface (one surface) on the first outlet 14 side of the outer peripheral portion 51b of the diaphragm 51. In this embodiment, the protective sheet 52 is made of the same material as the diaphragm 51 and has the same thickness as the diaphragm 51. The material of the diaphragm 51 may be a synthetic resin that can be used in a refrigerant such as HFC134a or HFO1234yf. The thickness of the diaphragm 51 may be a range that does not impair the deformation characteristics of the diaphragm 51. The protective sheet 52 may be arranged in contact with the surface of the outer peripheral portion 51b of the diaphragm 51 on the differential pressure valve chamber 13 side. Further, in this embodiment, the inner diameter of the protective sheet 52 is slightly smaller than the outer diameter of the central portion 51a of the diaphragm 51, but the inner diameter of the protective sheet 52 and the outer diameter of the central portion 51a may be the same. Even when the inner diameter of the protective sheet 52 is larger than the outer diameter of the central portion 51a, it has the effect of suppressing damage to the diaphragm 51 due to foreign matter.
　封止部材５３は、例えば、ポリテトラフルオロエチレン（ＰＴＦＥ）などの合成樹脂製である。封止部材５３は、ダイアフラム５１と同じ外径の円環板形状を有している。封止部材５３は、ダイアフラム５１の外周部５１ｂにおける差圧弁室１３側の面（他方の面）に接して配置されている。 The sealing member 53 is made of a synthetic resin such as polytetrafluoroethylene (PTFE). The sealing member 53 has an annulus plate shape having the same outer diameter as the diaphragm 51. The sealing member 53 is arranged in contact with the surface (the other surface) on the differential pressure valve chamber 13 side of the outer peripheral portion 51b of the diaphragm 51.
　保持部材５４は、全体的に円環形状を有している。保持部材５４は、円筒部５４ａと、フランジ部５４ｂと、を一体的に有している。フランジ部５４ｂは、円筒部５４ａの一端（各図において右端）に連設されている。フランジ部５４ｂは、保護シート５２に接する円環平面５４ｃを有している。円環平面５４ｃと円筒部５４ａの円筒形状の内周面５４ｄとは、曲面形状の接続面５４ｅで滑らかに接続されている。内周面５４ｄの径は、保護シート５２の内径より大きい。 The holding member 54 has an annular shape as a whole. The holding member 54 integrally has a cylindrical portion 54a and a flange portion 54b. The flange portion 54b is continuously provided at one end (right end in each drawing) of the cylindrical portion 54a. The flange portion 54b has an annular plane 54c in contact with the protective sheet 52. The annular plane 54c and the cylindrical inner peripheral surface 54d of the cylindrical portion 54a are smoothly connected by a curved connecting surface 54e. The diameter of the inner peripheral surface 54d is larger than the inner diameter of the protective sheet 52.
　保持部材５４と弁本体１０内の保持面１０ｂとの間に、保護シート５２、ダイアフラム５１の外周部５１ｂおよび封止部材５３が配置されている。保護シート５２と保持部材５４の接続面５４ｅとの隙間は、径方向外側に向かうにしたがって徐々に狭くなる。 A protective sheet 52, an outer peripheral portion 51b of the diaphragm 51, and a sealing member 53 are arranged between the holding member 54 and the holding surface 10b in the valve body 10. The gap between the protective sheet 52 and the connecting surface 54e of the holding member 54 gradually narrows toward the outer side in the radial direction.
　差圧弁枠５５は、一端（図１において左端）が塞がれた円筒形状を有している。差圧弁枠５５の一端には、流通孔５５ａが形成されている。差圧弁枠５５の内側空間は、流通孔５５ａを介して第１流出口１４に接続されている。差圧弁枠５５の他端は、保持部材５４の円筒部５４ａと嵌合されている。差圧弁枠５５の他端は、弁本体１０にねじ構造で固定されている。保持部材５４は、差圧弁枠５５によって、弁本体１０に対して固定されている。差圧弁枠５５は、保持部材５４を弁本体１０の保持面１０ｂ側に押し付けている。これにより、保護シート５２、ダイアフラム５１の外周部５１ｂおよび封止部材５３が、互いに重ねられた状態で保持部材５４と弁本体の保持面１０ｂとの間に保持される。 The differential pressure valve frame 55 has a cylindrical shape with one end (the left end in FIG. 1) closed. A flow hole 55a is formed at one end of the differential pressure valve frame 55. The inner space of the differential pressure valve frame 55 is connected to the first outlet 14 via the flow hole 55a. The other end of the differential pressure valve frame 55 is fitted with the cylindrical portion 54a of the holding member 54. The other end of the differential pressure valve frame 55 is fixed to the valve body 10 with a screw structure. The holding member 54 is fixed to the valve body 10 by the differential pressure valve frame 55. The differential pressure valve frame 55 presses the holding member 54 against the holding surface 10b side of the valve body 10. As a result, the protective sheet 52, the outer peripheral portion 51b of the diaphragm 51, and the sealing member 53 are held between the holding member 54 and the holding surface 10b of the valve body in a state of being overlapped with each other.
　差圧弁体５６は、略円板形状を有している。差圧弁体５６は、差圧弁室１３に左右方向に摺動可能に配置されている。差圧弁体５６の一方の端面（図１において右端面）には、円板形状のパッキン５６ａが取り付けられている。差圧弁体５６は、ダイアフラム５１の中央部５１ａに取り付けられている。具体的には、差圧弁体５６とストッパ５７とが、互いに結合され、中央部５１ａが差圧弁体５６とストッパ５７との間に保持されている。ストッパ５７は、差圧弁枠５５の内側に配置されている。ストッパ５７は、差圧弁体５６が最大開弁位置に至ると差圧弁枠５５のストッパ面５５ｂに当接して、差圧弁体５６の開弁方向の移動を規制する。ストッパ５７と差圧弁枠５５との間には、閉弁ばね５８が配置されている。閉弁ばね５８は、圧縮コイルばねであり、ストッパ５７を介して差圧弁体５６を右方（閉弁方向）に押している。 The differential pressure valve body 56 has a substantially disk shape. The differential pressure valve body 56 is slidably arranged in the differential pressure valve chamber 13 in the left-right direction. A disk-shaped packing 56a is attached to one end surface (right end surface in FIG. 1) of the differential pressure valve body 56. The differential pressure valve body 56 is attached to the central portion 51a of the diaphragm 51. Specifically, the differential pressure valve body 56 and the stopper 57 are coupled to each other, and the central portion 51a is held between the differential pressure valve body 56 and the stopper 57. The stopper 57 is arranged inside the differential pressure valve frame 55. When the differential pressure valve body 56 reaches the maximum valve opening position, the stopper 57 comes into contact with the stopper surface 55b of the differential pressure valve frame 55 to restrict the movement of the differential pressure valve body 56 in the valve opening direction. A valve closing spring 58 is arranged between the stopper 57 and the differential pressure valve frame 55. The valve closing spring 58 is a compression coil spring and pushes the differential pressure valve body 56 to the right (valve closing direction) via the stopper 57.
　次に、電磁弁１の動作の一例について説明する。 Next, an example of the operation of the solenoid valve 1 will be described.
　図１に電磁コイル３４に通電していない状態の電磁弁１を示す。図１において、パイロット弁体３６（具体的にはパッキン３６ａ）がパイロット弁座４５から離れており、パイロット弁座４５が開いている。また、主弁体４０（具体的にはパッキン４３ａ）が主弁座１７から離れており、主弁座１７が開いている。このとき、流入口１１から主弁室１２に流れ込んだ冷媒は、主弁座１７および主弁口１６を介して第１流出口１４に流れるとともに、分岐通路１８を介して差圧弁室１３に流れる。そのため、差圧弁室１３および第１流出口１４の圧力差が比較的小さく、図２、図３に示すように、ダイアフラム５１の中央部５１ａは差圧弁室１３側に突出する円錐台形状となる。これにより、差圧弁体５６（具体的にはパッキン５６ａ）が、差圧弁座２０に接して、差圧弁座２０を閉じる。差圧弁座２０が閉じていると、差圧弁室１３の冷媒は、差圧弁室１３に留まり第２流出口１５に流れない。 FIG. 1 shows a solenoid valve 1 in a state where the solenoid coil 34 is not energized. In FIG. 1, the pilot valve body 36 (specifically, the packing 36a) is separated from the pilot valve seat 45, and the pilot valve seat 45 is open. Further, the main valve body 40 (specifically, the packing 43a) is separated from the main valve seat 17, and the main valve seat 17 is open. At this time, the refrigerant flowing from the inflow port 11 into the main valve chamber 12 flows to the first outflow port 14 through the main valve seat 17 and the main valve port 16, and also flows to the differential pressure valve chamber 13 through the branch passage 18. .. Therefore, the pressure difference between the differential pressure valve chamber 13 and the first outlet 14 is relatively small, and as shown in FIGS. 2 and 3, the central portion 51a of the diaphragm 51 has a conical trapezoidal shape protruding toward the differential pressure valve chamber 13. .. As a result, the differential pressure valve body 56 (specifically, the packing 56a) comes into contact with 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.
　そして、電磁コイル３４に通電すると、プランジャ３３が吸引子３１に引き寄せられ、パイロット弁体３６が下方に移動する。そして、パイロット弁体３６がパイロット弁座４５に接して主弁体４０を下方に押し、主弁体４０が主弁座１７に接する。これにより、パイロット弁体３６がパイロット弁座４５を閉じ、主弁体４０が主弁座１７を閉じて、主弁室１２から第１流出口１４への冷媒の流れが遮断される。 Then, when the electromagnetic coil 34 is energized, the plunger 33 is attracted to the attractor 31 and the pilot valve body 36 moves downward. Then, the pilot valve body 36 comes into contact with the pilot valve seat 45 and pushes the main valve body 40 downward, and the main valve body 40 comes into contact with 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 the refrigerant from the main valve chamber 12 to the first outlet 14 is cut off.
　主弁体４０が主弁座１７を閉じて少し経つと、第１流出口１４の圧力が差圧弁室１３の圧力に対して低下する。そのため、差圧弁室１３および第１流出口１４の圧力差が比較的大きくなり、図４、図５に示すように、ダイアフラム５１の中央部５１ａが、第１流出口１４側に突出するように変形する。これにより、差圧弁体５６が、差圧弁座２０から離れ、差圧弁座２０を開く。差圧弁座２０が開くと、差圧弁室１３の冷媒が、差圧弁座２０および差圧弁口１９を介して第２流出口１５に流れる。 Shortly after the main valve body 40 closes the main valve seat 17, the pressure at the first outlet 14 drops with respect to the pressure at the differential pressure valve chamber 13. Therefore, the pressure difference between the differential pressure valve chamber 13 and the first outlet 14 becomes relatively large, and as shown in FIGS. 4 and 5, the central portion 51a of the diaphragm 51 projects toward the first outlet 14. transform. 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 via the differential pressure valve seat 20 and the differential pressure valve port 19.
　ダイアフラム５１の変形によって保護シート５２と保持部材５４の接続面５４ｅとの隙間が小さくなる。これにより、当該隙間に進入した異物が保護シート５２と保持部材５４との間に挟まることがある。しかしながら、保護シート５２が、ダイアフラム５１の外周部５１ｂに重ねて配置されており、ダイアフラム５１に直接的に異物が接触することを防いでいる。 Due to the deformation of the diaphragm 51, the gap between the protective sheet 52 and the connecting surface 54e of the holding member 54 becomes smaller. As a result, foreign matter that has entered the gap may be caught between the protective sheet 52 and the holding member 54. However, the protective sheet 52 is arranged so as to overlap the outer peripheral portion 51b of the diaphragm 51 to prevent foreign matter from directly contacting the diaphragm 51.
　そして、電磁コイル３４を再び通電していない状態にすると、プランジャ３３が開弁ばね３８によって上方に押され、パイロット弁体３６がパイロット弁座４５から離れ、パイロット弁座４５が開く。パイロット弁室３７の冷媒がパイロット弁座４５およびパイロット弁口４４を介して第１流出口１４に流れて、冷媒による主弁体４０を主弁座１７に押し付ける力が弱まる。主弁体４０が開弁ばね３９によって上方に押され、主弁体４０が、主弁座１７から離れ、主弁座１７を開く。これにより、主弁室１２の冷媒は、主弁座１７および主弁口１６を介して第１流出口１４に流れる。そのため、差圧弁室１３および第１流出口１４の圧力差が比較的小さくなり、図２、図３に示すように、ダイアフラム５１の中央部５１ａは差圧弁室１３側に突出する円錐台形状に復帰する。これにより、差圧弁体５６が、差圧弁座２０に接して、差圧弁座２０を閉じる。 Then, when the electromagnetic coil 34 is not energized again, the plunger 33 is pushed upward by the valve opening spring 38, the pilot valve body 36 is separated from the pilot valve seat 45, and the pilot valve seat 45 is opened. The refrigerant in the pilot valve chamber 37 flows to the first outlet 14 through the pilot valve seat 45 and the pilot valve port 44, and the force of the refrigerant pressing the main valve body 40 against the main valve seat 17 is weakened. The main valve body 40 is pushed upward by the valve opening spring 39, and the main valve body 40 separates from the main valve seat 17 and opens the main valve seat 17. As a result, the refrigerant in the main valve chamber 12 flows to the first outlet 14 through the main valve seat 17 and the main valve port 16. Therefore, the pressure difference between the differential pressure valve chamber 13 and the first outlet 14 becomes relatively small, and as shown in FIGS. 2 and 3, the central portion 51a of the diaphragm 51 has a conical trapezoidal shape protruding toward the differential pressure valve chamber 13. Return. As a result, the differential pressure valve body 56 comes into contact with the differential pressure valve seat 20 and closes the differential pressure valve seat 20.
　以上説明したように、電磁弁１は、流入口１１と、流入口１１に接続された主弁室１２と、主弁室１２に主弁座１７を介して接続された第１流出口１４と、主弁室１２に分岐通路１８を介して接続された差圧弁室１３と、差圧弁室１３に差圧弁座２０を介して接続された第２流出口１５と、を有する弁本体１０を有する。電磁弁１は、主弁室１２に配置され、主弁座１７を開閉する主弁体４０と、差圧弁室１３と第１流出口１４とを区画するように配置された合成樹脂製のダイアフラム５１と、弁本体１０に対して固定された円環形状の保持部材５４と、差圧弁室１３に配置され、ダイアフラム５１によって移動される差圧弁体５６と、を有する。電磁弁１は、ダイアフラム５１の外周部５１ｂにおける第１流出口１４側（すなわち保持部材５４側）の面に接して配置された合成樹脂製の円環形状の保護シート５２を有している。ダイアフラム５１の外周部５１ｂおよび保護シート５２が、弁本体の保持面１０ｂと保持部材５４との間に保持されている。 As described above, the solenoid valve 1 includes an inflow port 11, a main valve chamber 12 connected to the inflow port 11, and a first outlet 14 connected to the main valve chamber 12 via a main valve seat 17. , A valve body 10 having 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 solenoid valve 1 is arranged in the main valve chamber 12, and is a synthetic resin diaphragm arranged so as to partition the main valve body 40 that opens and closes the main valve seat 17, and the differential pressure valve chamber 13 and the first outlet 14. It has a 51, an annular holding member 54 fixed to the valve body 10, and a differential pressure valve body 56 arranged in the differential pressure valve chamber 13 and moved by the diaphragm 51. The solenoid valve 1 has a ring-shaped protective sheet 52 made of synthetic resin arranged in contact with the surface of the first outlet 14 side (that is, the holding member 54 side) of the outer peripheral portion 51b of the diaphragm 51. The outer peripheral portion 51b of the diaphragm 51 and the protective sheet 52 are held between the holding surface 10b of the valve body and the holding member 54.
　このようにしたことから、ダイアフラム５１が変形した際に、保持部材５４と保護シート５２との間に異物が挟まり、ダイアフラム５１に異物が直接的に接触することを防ぐことができる。そのため、電磁弁１において、ダイアフラム５１の損傷を抑制できる。 Since this is done, when the diaphragm 51 is deformed, foreign matter is caught between the holding member 54 and the protective sheet 52, and it is possible to prevent the foreign matter from coming into direct contact with the diaphragm 51. Therefore, damage to the diaphragm 51 can be suppressed in the solenoid valve 1.
　また、差圧弁室１３と第１流出口１４との差圧がない状態でダイアフラム５１の中央部５１ａが円錐台形状である。そして、差圧弁体５６が、ダイアフラム５１の中央部５１ａに取り付けられている。このようにすることで、差圧弁体５６の移動量を大きくすることができる。 Further, the central portion 51a of the diaphragm 51 has a conical trapezoidal shape in a state where there is no differential pressure between the differential pressure valve chamber 13 and the first outlet 14. The differential pressure valve body 56 is attached to the central portion 51a of the diaphragm 51. By doing so, the amount of movement of the differential pressure valve body 56 can be increased.
　また、保持部材５４が、保護シート５２に接する円環平面５４ｃと、円筒形状の内周面５４ｄと、円環平面５４ｃと内周面５４ｄとを滑らかに接続する曲面形状の接続面５４ｅと、を有している。そして、保護シート５２の内径が、保持部材５４の内周面５４ｄの径より小さい。このようにすることで、保護シート５２が接続面５４ｅ全体と向かい合うように配置され、ダイアフラム５１と接続面５４ｅとの間に異物が挟まることをより確実に回避して、ダイアフラム５１の損傷をさらに抑制できる。 Further, the holding member 54 has a curved connecting surface 54e that smoothly connects the annular plane 54c in contact with the protective sheet 52, the cylindrical inner peripheral surface 54d, and the annular plane 54c and the inner peripheral surface 54d. have. The inner diameter of the protective sheet 52 is smaller than the diameter of the inner peripheral surface 54d of the holding member 54. By doing so, the protective sheet 52 is arranged so as to face the entire connecting surface 54e, more reliably avoiding foreign matter from being caught between the diaphragm 51 and the connecting surface 54e, and further damaging the diaphragm 51. Can be suppressed.
　また、電磁弁１が、ダイアフラム５１の外周部５１ｂにおける差圧弁室１３側（すなわち弁本体１０側）の面に重ねて配置された円環形状の封止部材５３を有している。封止部材５３、ダイアフラム５１の外周部５１ｂおよび保護シート５２が、弁本体の保持面１０ｂと保持部材５４との間に保持されている。このようにすることで、ダイアフラム５１と弁本体１０との間を効果的に封止でき、差圧弁室１３と第１流出口１４とを互いに効果的に密閉できる。 Further, the solenoid valve 1 has an annular sealing member 53 arranged so as to be overlapped with the surface of the differential pressure valve chamber 13 side (that is, the valve body 10 side) in the outer peripheral portion 51b of the diaphragm 51. The sealing member 53, the outer peripheral portion 51b of the diaphragm 51, and the protective sheet 52 are held between the holding surface 10b of the valve body and the holding member 54. By doing so, the space between the diaphragm 51 and the valve body 10 can be effectively sealed, and the differential pressure valve chamber 13 and the first outlet 14 can be effectively sealed from each other.
　なお、本実施例の電磁弁１は、電磁弁部３０と差圧弁部５０とを有する複合弁であったが、本発明を単体の差圧弁に適用してもよい。 Although the solenoid valve 1 of the present embodiment is a composite valve having a solenoid valve portion 30 and a differential pressure valve portion 50, the present invention may be applied to a single differential pressure valve.
　上記に本発明の実施例を説明したが、本発明はこれらの例に限定されるものではない。前述の実施例に対して、当業者が適宜、構成要素の追加、削除、設計変更を行ったものや、実施例の特徴を適宜組み合わせたものも、本発明の趣旨に反しない限り、本発明の範囲に含まれる。 Although the embodiments of the present invention have been described above, the present invention is not limited to these examples. As long as the gist of the present invention is not contrary to the above-mentioned embodiments, those skilled in the art appropriately adding, deleting, or changing the design, or combining the features of the examples as appropriate are also present inventions. Is included in the range of.
　１…差圧弁付電磁弁、１０…弁本体、１０ａ…左側面、１０ｂ…保持面、１１…流入口、１２…主弁室、１３…差圧弁室、１４…第１流出口、１５…第２流出口、１６…主弁口、１７…主弁座、１８…分岐通路、１９…差圧弁口、２０…差圧弁座、３０…電磁弁部、３１…吸引子、３１ａ…大径円筒部、３１ｂ…小径円筒部、３２…キャン、３３…プランジャ、３４…電磁コイル、３５…弁軸、３５ａ…流体通路、３６…パイロット弁体、３６ａ…パッキン、３７…パイロット弁室、３８、３９…開弁ばね、４０…主弁体、４１…胴部、４２…上フランジ部、４２ａ…均圧通路、４３…下フランジ部、４３ａ…パッキン、４４…パイロット弁口、４５…パイロット弁座、５０…差圧弁部、５１…ダイアフラム、５１ａ…中央部、５１ｂ…外周部、５２…保護シート、５３…封止部材、５４…保持部材、５４ａ…円筒部、５４ｂ…フランジ部、５４ｃ…円環平面、５４ｄ…内周面、５４ｅ…接続面、５５…差圧弁枠、５５ａ…流通孔、５５ｂ…ストッパ面、５６…差圧弁体、５６ａ…パッキン、５７…ストッパ、５８…閉弁ばね

  1 ... Electromagnetic 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 ... No. 2 outlets, 16 ... main valve port, 17 ... main valve seat, 18 ... branch passage, 19 ... differential pressure valve port, 20 ... differential pressure valve seat, 30 ... electromagnetic valve part, 31 ... suction element, 31a ... large diameter cylindrical part , 31b ... Small diameter cylindrical part, 32 ... Can, 33 ... Flange, 34 ... Electromagnetic coil, 35 ... Valve shaft, 35a ... Fluid passage, 36 ... Pilot valve body, 36a ... Packing, 37 ... Pilot valve chamber, 38, 39 ... Valve opening spring, 40 ... main valve body, 41 ... body, 42 ... upper flange, 42a ... pressure equalizing passage, 43 ... lower flange, 43a ... packing, 44 ... pilot valve port, 45 ... pilot valve seat, 50 ... Differential pressure valve portion, 51 ... Diaphragm, 51a ... Central portion, 51b ... Outer peripheral portion, 52 ... Protective sheet, 53 ... Sealing member, 54 ... Holding member, 54a ... Cylindrical portion, 54b ... Flange portion, 54c ... Circular plane , 54d ... Inner peripheral surface, 54e ... Connection surface, 55 ... Differential pressure valve frame, 55a ... Flow hole, 55b ... Stopper surface, 56 ... Differential pressure valve body, 56a ... Packing, 57 ... Stopper, 58 ... Valve closed spring

Claims (6)

  1. 　弁室と背圧室とを有する弁本体と、前記弁室と前記背圧室とを区画するように配置された合成樹脂製のダイアフラムと、前記弁本体に対して固定された円環形状の保持部材と、前記弁室に配置され、前記ダイアフラムによって移動される弁体と、を有する差圧弁であって、
    　前記ダイアフラムの外周部の一方の面に接して配置された合成樹脂製の円環形状の保護シートを有し、
    　前記ダイアフラムの外周部および前記保護シートが、前記弁本体と前記保持部材との間に保持されていることを特徴とする差圧弁。     A valve body having a valve chamber and a back pressure chamber, a synthetic resin diaphragm arranged so as to partition the valve chamber and the back pressure chamber, and an annular shape fixed to the valve body. A differential pressure valve having a holding member and a valve body arranged in the valve chamber and moved by the diaphragm.
    It has a ring-shaped protective sheet made of synthetic resin arranged in contact with one surface of the outer peripheral portion of the diaphragm.
    A differential pressure valve characterized in that an outer peripheral portion of the diaphragm and the protective sheet are held between the valve body and the holding member.
  2. 　前記弁室と前記背圧室との差圧がない状態で前記ダイアフラムの中央部が円錐台形状であり、
    　前記弁体が、前記ダイアフラムの中央部に取り付けられている、請求項１に記載の差圧弁。     The central portion of the diaphragm has a conical trapezoidal shape with no differential pressure between the valve chamber and the back pressure chamber.
    The differential pressure valve according to claim 1, wherein the valve body is attached to a central portion of the diaphragm.
  3. 　前記保護シートの内径が、前記ダイアフラムの中央部の外径より小さい、請求項２に記載の差圧弁。 The differential pressure valve according to claim 2, wherein the inner diameter of the protective sheet is smaller than the outer diameter of the central portion of the diaphragm.
  4. 　前記保護シートが、前記ダイアフラムの外周部における前記保持部材側の面に接して配置され、
    　前記保持部材が、前記保護シートに接する円環平面と、円筒形状の内周面と、前記円環平面と前記内周面とを滑らかに接続する曲面形状の接続面と、を有し、
    　前記保護シートの内径が、前記保持部材の内周面の径より小さい、請求項１～請求項３のいずれか一項に記載の差圧弁。     The protective sheet is arranged in contact with the surface of the outer peripheral portion of the diaphragm on the holding member side.
    The holding member has an annular plane in contact with the protective sheet, a cylindrical inner peripheral surface, and a curved connecting surface that smoothly connects the annular plane and the inner peripheral surface.
    The differential pressure valve according to any one of claims 1 to 3, wherein the inner diameter of the protective sheet is smaller than the diameter of the inner peripheral surface of the holding member.
  5. 　前記ダイアフラムの外周部の他方の面に接して配置された円環形状の封止部材をさらに有し、
    　前記封止部材、前記ダイアフラムの外周部および前記保護シートが、前記弁本体と前記保持部材との間に保持されている、請求項１～請求項４のいずれか一項に記載の差圧弁。     Further, it has an annular shape sealing member arranged in contact with the other surface of the outer peripheral portion of the diaphragm.
    The differential pressure valve according to any one of claims 1 to 4, wherein the sealing member, the outer peripheral portion of the diaphragm, and the protective sheet are held between the valve body and the holding member.
  6. 　流入口と、前記流入口に接続された主弁室と、前記主弁室に主弁座を介して接続された第１流出口と、前記主弁室に分岐通路を介して接続された差圧弁室と、前記差圧弁室に差圧弁座を介して接続された第２流出口と、を有する弁本体と、
    　前記主弁室に配置され、前記主弁座を開閉する主弁体と、
    　前記差圧弁室と背圧室としての前記第１流出口とを区画するように配置された合成樹脂製のダイアフラムと、
    　前記弁本体に対して固定された円環形状の保持部材と、
    　前記差圧弁室に配置され、前記ダイアフラムによって移動される差圧弁体と、を有する弁装置であって、
    　前記ダイアフラムの外周部の一方の面に接して配置された合成樹脂製の円環形状の保護シートを有し、
    　前記ダイアフラムの外周部および前記保護シートが、前記弁本体と前記保持部材との間に保持されていることを特徴とする弁装置。

          Difference between the inflow port, the main valve chamber connected to the inflow port, the first outlet connected to the main valve chamber via the main valve seat, and the main valve chamber connected to the main valve chamber via a branch passage. A valve body having a pressure valve chamber and a second outlet connected to the differential pressure valve chamber via a differential pressure valve seat.
    A main valve body that is arranged in the main valve chamber and opens and closes the main valve seat,
    A synthetic resin diaphragm arranged so as to partition the differential pressure valve chamber and the first outlet as a back pressure chamber, and
    An annular holding member fixed to the valve body and
    A valve device having a differential pressure valve body arranged in the differential pressure valve chamber and moved by the diaphragm.
    It has a ring-shaped protective sheet made of synthetic resin arranged in contact with one surface of the outer peripheral portion of the diaphragm.
    A valve device characterized in that an outer peripheral portion of the diaphragm and the protective sheet are held between the valve body and the holding member.
PCT/JP2021/035502 2020-12-24 2021-09-28 Differential pressure valve and valve device having same WO2022137693A1 (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000193105A (en) * 1998-12-25 2000-07-14 Ckd Corp Elastic member fixing structure
JP2014152848A (en) * 2013-02-07 2014-08-25 Fuji Koki Corp Electromagnetic valve with differential pressure valve
JP2016217513A (en) * 2015-05-25 2016-12-22 株式会社テージーケー Control valve

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000193105A (en) * 1998-12-25 2000-07-14 Ckd Corp Elastic member fixing structure
JP2014152848A (en) * 2013-02-07 2014-08-25 Fuji Koki Corp Electromagnetic valve with differential pressure valve
JP2016217513A (en) * 2015-05-25 2016-12-22 株式会社テージーケー Control valve

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