JP6731671B2 - Pilot control valve - Google Patents

Description

The present invention relates to a pilot type control valve suitable for use in a heat pump type heating/cooling system, etc., and particularly to driving a pilot valve body up and down, and responding to this pilot valve body, a main valve opening of a large diameter main valve The present invention relates to a pilot control valve adapted to be opened and closed by the body.

As a pilot control valve of this type, for example, as disclosed in Patent Documents 1 and 2, a pilot valve element is driven by an electromagnetic actuator (solenoid), and a large-diameter main valve is driven in response to the pilot valve element. 2. Description of the Related Art A pilot type electromagnetic control valve having a main valve body for opening and closing a mouth is known.

Further, as a pilot type electric control valve in which a pilot valve body is driven up and down by an electric motor (stepping motor), and a large-diameter main valve opening is opened and closed by the main valve body in response to the pilot valve body, For example, as described in Patent Document 3, a piston-type main valve body and the main valve body are slidably fitted and inserted, and are partitioned into a back pressure chamber and a main valve chamber by the main valve body. And a pilot passage for letting the pressure of the back pressure chamber escape to the outlet, and the pilot passage is opened and closed by a pilot valve that is driven up and down by the electric motor. It is known that this was done.

Japanese Patent No. 5982306 Japanese Patent No. 6111082 Patent No. 5881367

By the way, the conventional pilot type control valve described in the above-mentioned Patent Documents 1 to 3, in particular, the main valve body (diaphragm valve body) using a diaphragm as described in the above-mentioned Patent Document 1 opens and closes the main valve opening. In the pilot type control valve, the main valve body is composed of a diaphragm and a diaphragm receiver, and while opening and closing the main valve opening with the diaphragm, a pilot passage is provided in the diaphragm receiver integrally assembled with the diaphragm, A rubber valve body (sealing member) attached to a plunger that is driven up and down by an electromagnetic actuator as a lifting drive device opens and closes the pilot passage.

Therefore, in the above conventional pilot type control valve, it is necessary to separately prepare a rubber valve body that opens and closes the pilot passage and to attach the rubber valve body to the tip of the plunger by caulking, etc. There was a problem of causing an increase in points.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a pilot type control valve capable of reducing the number of assembly steps and the number of parts.

In order to achieve the above object, a pilot type control valve according to the present invention basically comprises a valve main body provided with an inlet and an outlet, a main valve body for opening and closing the outlet, and the main valve body. For accommodating a valve body, a storage chamber partitioned by the main valve body into a main valve chamber and a back pressure chamber, and for supplying the pressure of the main valve chamber or the inflow port to the back pressure chamber. A pressure supply passage, a pilot passage for releasing the pressure of the back pressure chamber to the outflow port is provided in the main valve body, and the pilot passage is opened and closed by a pilot valve body driven up and down by an elevator drive device. Thus, the outlet is opened and closed by the main valve body in response to the pilot valve body, the main valve body is made of an elastic member, and the pilot valve body is opened and closed while opening and closing the outlet port. a diaphragm toward and away from the pilot valve seat is provided, have a reinforcing member for holding the rigidity of the diaphragm, the diaphragm is formed on one surface of said reinforcing member and the main for opening and closing the outlet One side seal part having a valve body part, an elastically deformable part extending on the outer periphery of the one side seal part and fixed to the valve body, and a pilot valve seat formed on the other surface of the reinforcing member. and the other sealing section having, the one made up of a connecting portion for connecting the side seal portion and the other side sealing portion, the reinforcing member, the stopper defining the maximum lift position of the main valve body that are equipped It is characterized by that.

Further, the pilot type control valve according to the present invention basically has a valve body provided with an inflow port and an outflow port, a main valve body for opening and closing the outflow port, and the main valve body. And a storage chamber partitioned by the main valve body into a main valve chamber and a back pressure chamber, and a pressure supply passage for supplying the pressure of the main valve chamber or the inlet to the back pressure chamber. A pilot passage for releasing the pressure of the back pressure chamber to the outflow port is provided in the main valve body, and the pilot valve is opened and closed by a pilot valve body that is driven up and down by an elevator drive device. A pilot valve seat adapted to open and close the outflow port by the main valve body in response to a body, the main valve body being made of an elastic member, for opening and closing the outflow port and contacting and separating the pilot valve body. And a reinforcing member for holding the rigidity of the diaphragm, the diaphragm having a main valve body portion formed on one surface of the reinforcing member and opening and closing the outlet. A side seal part, an elastically deformable part extending on the outer periphery of the one side seal part and fixed to the valve body, and another side seal part formed on the other surface of the reinforcing member and having the pilot valve seat. The pressure supply passage is formed of a connecting portion that connects the one-side seal portion and the other-side seal portion, and the pressure supply passage communicates with the one-side communication hole formed in the diaphragm and the other-side communication hole formed in the reinforcing member. it is characterized by being composed of a hole.

In another preferred aspect, the diaphragm and the reinforcing member are integrated.

In a further preferred aspect, the diaphragm and the reinforcing member are integrated by insert molding.

In another preferred aspect, the reinforcing member is provided with a stopper that defines a maximum lift position of the main valve body.

In a further preferred aspect, the stopper is formed integrally with or separately from the reinforcing member.

In another preferred aspect, the reinforcing member is disposed inside the elastically deformable portion provided on the peripheral edge of the diaphragm.

In a further preferred aspect, the connecting portion is formed in a through hole provided in the reinforcing member.

The pilot valve seat is preferably provided inside the connecting portion in the other side seal portion.

The main valve body portion is preferably provided outside the connecting portion in the one-side seal portion.

The reinforcing member is preferably made of resin or metal.

The pilot valve element is preferably made of resin or metal.

The lifting drive device is preferably composed of an electromagnetic actuator or an electric motor.

According to the present invention, a diaphragm made of, for example, an elastic member is provided with a pilot valve seat for contacting and separating a pilot valve body that opens and closes a pilot passage. Since the step of attaching the valve body (sealing member) by caulking or the like is unnecessary, the number of assembly steps and the number of parts can be reduced.

Further, when the diaphragm and the reinforcing member that retains the rigidity of the diaphragm are integrated by insert molding or the like, the step of assembling the diaphragm and the reinforcing member becomes unnecessary.

Further, since the reinforcing member is disposed inside the elastically deforming portion at the periphery of the diaphragm and does not contact the elastically deforming portion, the processing accuracy of the reinforcing member does not affect the deformation behavior of the diaphragm, and the pilot control valve There is also an effect that the control accuracy of can be secured.

1 is a longitudinal sectional view showing an embodiment of a pilot type control valve (pilot type solenoid valve) according to the present invention. The perspective view of the main valve body shown by FIG. FIG. 2B is a perspective view of the reinforcing member (state before integral molding) shown in FIG. 2A. 2 is a perspective view of the housing shown in FIG. 1. FIG. FIG. 3 is an enlarged vertical cross-sectional view of a main part provided for explaining the operation of the pilot solenoid valve shown in FIG. 1, showing a valve closed state (pilot valve body: closed, main valve body: closed). FIG. 3 is an enlarged vertical cross-sectional view of an essential part provided for explaining the operation of the pilot solenoid valve shown in FIG. 1, showing a state in which a pilot passage is open (pilot valve body: open, main valve body: closed). FIG. 3 is an enlarged vertical cross-sectional view of an essential part provided for explaining the operation of the pilot solenoid valve shown in FIG. 1, showing a valve open state (pilot valve body: open, main valve body: open).

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a longitudinal sectional view showing an embodiment of a pilot type solenoid valve as a pilot type control valve according to the present invention. FIG. 1 is a cross-sectional view of the left side of the O line along the plane passing through the center of the connector portion 56 toward the paper surface, and the right side of the O line is a cross-sectional view of the surface perpendicular to the paper surface.

In this specification, the description of the position, direction such as up and down, left and right, and front and back is added for convenience according to the drawings in order to avoid complicated description, and the position and direction in the actual use state. Does not necessarily mean. In this specification, the side on which the electromagnetic actuator (solenoid) as the lifting drive device is arranged is the upper side, and the side on which the valve body is arranged is the lower side.

Further, in each drawing, the gaps formed between the members and the separation distances between the members are larger than the dimensions of the respective constituent members for the sake of easy understanding of the invention and convenience of drawing. Or it may be drawn small.

The pilot type solenoid valve 1 of the illustrated embodiment is used for a heat pump type cooling and heating system of a car air conditioner or the like, and mainly has a bottomed short cylindrical valve body 10 having an inlet 11 and an outlet 12. An electromagnetic actuator (elevating drive device) 50 provided on the upper side of the valve body 10 is provided.

At the center of the bottom of the valve body 10, a cylindrical portion 13 having an outlet 12 with a main valve seat 12a is formed (in the illustrated example, integrally formed), and at the same time so as to be orthogonal to the outlet 12. A lateral hole-shaped inlet 11 is provided on the side thereof.

A lid member 14 made of a substantially dome-shaped magnetic metal (for example, iron) is attached to the upper portion of the valve body 10 so as to close the upper opening of the valve body 10. The lower end of the suction element 53 of the electromagnetic actuator 50, which will be described later, is fitted in the center of the ceiling portion 14a of the lid member 14 and the pilot valve body 40 (the lower large diameter portion 43 thereof) is inserted therein. A hole 14c is provided. Further, a flange portion 14b is extended (downward) on the outer peripheral portion of the ceiling portion 14a, and the lid member 14 is fixed to (the upper part of) the valve body 10 via the flange portion 14b. In the illustrated example, the lid member 14 is fastened and fixed with the bolts 15 to the flange portions 14b of the lid member 14 at a plurality of mounting portions 10a provided integrally with the outer periphery of the valve body 10 and substantially symmetrical with respect to the axis O. By doing so, the valve body 10 is assembled.

A main valve body (also referred to as a diaphragm valve body) 20 having a diaphragm 21 is elastically deformably stored in the valve body 10, specifically, in a storage chamber 16 defined by the valve body 10 and a lid member 14. The main valve body 20 divides the storage chamber 16 into a main valve chamber 17 and a back pressure chamber 18. A pilot passage (pilot valve port) 39 with a pilot valve seat 39a for letting the pressure of the back pressure chamber 18 escape to the outlet 12 is formed in the central portion of the main valve body 20 so as to penetrate in the up-down direction (axis O direction). The pilot valve body portion 40a of the pilot valve body 40, which will be described later, opens and closes the pilot passage 39. A pressure supply passage (equal to the pressure in the main valve chamber 17 or the inflow port 11) (equal to the pressure in the main valve chamber 17 or the inflow port 11) is provided at a position away from the center of the main valve body 20 (a position outside the outflow port 12). A pressure passage) 19 is provided.

Specifically, the main valve body 20 includes a diaphragm 21 made of an elastic member such as rubber or Teflon (registered trademark), and a reinforcement with a disk-shaped stopper 33 made of hard resin or metal, for example. The member 30 and the member 30 are integrally formed by, for example, insert molding. In this example, the diaphragm 21 and the reinforcing member 30 are integrated by insert molding, but it is sufficient that the diaphragm 21 and the reinforcing member 30 are fixed, and for example, the diaphragm 21 is partially attached to the diaphragm 21. May be fitted or fixed with an adhesive.

More specifically, the reinforcing member 30 is formed to have a diameter larger than that of the outlet 12, and as can be seen by referring to FIGS. 2A and 2B in addition to FIG. ) Is formed, and a through hole 32 is formed around the center hole 31 for allowing an elastic member forming the diaphragm 21 to pass through when the main valve body 20 is formed. In this example, four through holes 32, which are substantially fan-shaped in a plan view, are provided around the center hole 31 in the reinforcing member 30 at substantially equal angular intervals.

Further, around the through hole 32 on the upper surface of the reinforcing member 30, the maximum deformation (lift) position of the main valve body 20 is brought into contact with the ceiling surface of the storage chamber 16 (that is, the lower surface of the ceiling portion 14a of the lid member 14). A stopper 33 that determines the position is projected. The stopper 33 prevents the pilot valve seat 39a provided on (the diaphragm 21 of) the main valve body 20 from colliding with the pilot valve body 40 or the like when the valve is opened (that is, when the main valve body 20 is lifted). Therefore, the height thereof is set higher than the height of the upper seal portion 24 of the diaphragm 21, which will be described later. In this example, four substantially rectangular stoppers 33 are provided outside the through hole 32 in the reinforcing member 30 at substantially equal angular intervals.

Although the stopper 33 is formed integrally with the reinforcing member 30 here, it may be formed separately from the reinforcing member 30 (in other words, as a separate component). Further, it goes without saying that the stopper may be formed on, for example, the diaphragm 21 or the ceiling portion 14a of the lid member 14.

Further, in the vicinity of the outer periphery of the reinforcing member 30 (in the example shown in FIGS. 2A and 2B, in the vicinity of the middle of the adjacent stoppers 33), the upper side communication hole (the other side communication hole) forming the pressure supply passage 19 (upper half). ) (Also referred to as a pressure equalizing hole) 34 is formed, and a part of an elastic member that constitutes the diaphragm 21 is introduced to increase the fixing force between the reinforcing member 30 and the diaphragm 21. In the example shown in FIGS. 2A and 2B, three) 35 are opened.

On the other hand, the diaphragm 21 basically has a relatively thick disc-shaped lower seal portion (one side seal portion) 22 formed on the lower surface side of the reinforcing member 30, and the lower seal portion 22. A relatively thin elastically deforming portion 23 extending on the outer periphery (that is, the peripheral edge of the diaphragm 21), and an annular upper side around the central hole 31 and on the through hole 32 on the upper surface side of the reinforcing member 30. The seal portion (the other side seal portion) 24 and a connecting portion formed in the through hole 32 of the reinforcing member 30 and connecting the lower seal portion 22 and the upper seal portion 24 (in this example, four connecting portions). ) 25.

A central hole 26 that constitutes (a lower part of) the pilot passage 39 is provided in the central portion of the lower seal portion 22, and the inner periphery of the upper seal portion 24, the central hole 31 of the reinforcing member 30, and the lower hole. The pilot passage 39 is formed with the central hole 26 of the side seal portion 22.

A lower communication hole (one side communication hole) (also referred to as a pressure equalizing hole) 27 that constitutes the pressure supply passage 19 (lower half) is provided near the outer periphery of the lower seal portion 22. The lower communication hole 27 of the lower seal portion 22 and the upper communication hole 34 of the reinforcing member 30 form the pressure supply passage 19. In the illustrated example, the upper communication hole 34 of the reinforcing member 30 is made slightly smaller than the lower communication hole 27 of the lower seal portion 22, and the passage diameter of the pilot passage 39 (the inner diameter of the upper seal portion 24, the reinforcing member 30. The hole diameter of the central hole 31 and the hole diameter of the central hole 26 of the lower seal portion 22 are smaller than the (minimum) passage diameter of the pressure supply passage 19 (here, the diameter of the upper communication hole 34 of the reinforcing member 30). Has been made slightly larger.

In the present embodiment, the lower surface of the lower seal portion 22 of the diaphragm 21 constituting the main valve body 20 (in the illustrated example, an annular portion slightly inside the lower communication hole 27 and slightly outside the connecting portion 25) is A main valve body portion 20a that opens and closes the outflow port 12 by contacting with and separating from (the main valve seat 12a at the upper end of) the outflow port 12 is formed. A pilot valve seat 39a whose inner side and an annular portion slightly inside the connecting portion 25) comes into contact with and separates from (the lower end of the pilot valve body 40a of) the pilot valve body 40 connected to the plunger 58 of the electromagnetic actuator 50. It is said that

A diaphragm receiving portion 10b is provided at an upper end of the valve body 10, and a main valve body 20 (a diaphragm 21 thereof) is arranged so as to cover an upper surface opening of the valve body 10, and the diaphragm of the main valve body 20 is provided. The outer peripheral portion of 21 (more specifically, the elastically deforming portion 23) (more specifically, the thick portion formed on the outer periphery of the elastically deforming portion 23) is provided with the diaphragm receiving portion 10 b provided at the upper end of the valve body 10 and the lid member 14. The back pressure chamber 18 is formed above the main valve body 20 in the storage chamber 16 by being pinched and held by the flange portion 14b provided on the outer periphery of the main valve chamber 20 below the main valve body 20. 17 are formed.

As described above, in this embodiment, the inlet 11 or the main valve chamber 17 and the back valve chamber 17 are connected to each other through the lower communication hole 27 of the lower seal portion 22 and the upper communication hole 34 of the reinforcing member 30 which configure the pressure supply passage 19. When the pilot passage 39 is in communication with the pressure chamber 18 and the pilot passage 39 is closed by the pilot valve body 40a of the pilot valve body 40, the inlet 11, the main valve chamber 17, and the back pressure chamber 18 are not connected to each other. , High pressure fluid will be filled.

In this example, the main valve body 20 is provided with the pressure supply passage 19 for supplying the pressure of the main valve chamber 17 or the inlet 11 to the back pressure chamber 18. Of course, it may be provided on the valve body 10 or the like other than the valve body 20.

Since the diaphragm 21 and the reinforcing member 30 are integrally formed by insert molding or the like as described above, the rigidity of the diaphragm 21 (in particular, the main valve body portion 20a and the upper side of the lower seal portion 22 and the upper valve portion 20a) are increased by the reinforcing member 30. The strength of the pilot valve seat 39a in the seal portion 24 is retained.

The electromagnetic actuator (solenoid) 50 is mounted and fixed on the valve body 10.

The electromagnetic actuator 50 includes a resin coil bobbin 52 around which a solenoid coil 51 is wound. The coil bobbin 52 has a cylindrical tubular body portion 52a on which the solenoid coil 51 is externally mounted, and a pair of flange portions for restricting variation of the solenoid coil 51 at the upper end portion and the lower end portion of the tubular body portion 52a. (Upper flange portion 52b, lower flange portion 52c) are integrally formed.

A cylindrical plunger 58 made of magnetic metal and a suction element 53 are arranged to face each other in the vertical direction on the inner circumference of (the cylindrical body portion 52a of) the coil bobbin 52, and the plunger 58 (the outer circumference thereof) has a magnetic property. A magnetic pole 59 made of a metal cylindrical body is provided on the exterior.

The cylindrical suction element 53 is arranged at the lower portion of the inner circumference of the coil bobbin 52 (the cylindrical body portion 52a thereof), and the lower portion of the suction element 53 is the lower end (opening) of the coil bobbin 52 (the cylindrical body portion 52a thereof). It protrudes from and is fitted and fixed in the fitting hole 14c of the lid member 14 by press fitting, caulking or the like. This suction element 53 is provided with a stepped insertion hole (upper small diameter insertion hole 53a, lower large diameter insertion hole 53b) for inserting the lower portion of the pilot valve body 40 along the vertical direction (axis O direction). ing.

On the other hand, the plunger 58 is disposed above (on the cylindrical body portion 52a of) the coil bobbin 52 so as to be movable in the vertical direction (the direction of the axis O) (with the magnetic pole 59 therebetween). In other words, the cylindrical magnetic pole 59 is fitted in the upper part of the inner circumference of the coil bobbin 52 (the cylindrical body portion 52a thereof), and the plunger 58 is inserted inside the magnetic pole 59 so as to be movable along the axis O direction. ing. That is, here, a hollow portion formed inside (inside of the coil body 49 in which the solenoid coil 51 is wound around the coil bobbin 52) of the coil bobbin 52 (the cylindrical body portion 52a thereof) is arranged so that the plunger 58 can be moved up and down. The plunger chamber 60 has a wall surface facing the hollow portion, and is used as an inner wall surface of the plunger chamber 60. The plunger 58 is provided with stepped insertion holes (upper small diameter insertion hole 58a, lower large diameter insertion hole 58b) for inserting the upper portion of the pilot valve body 40 along the vertical direction (axis O direction). There is.

The magnetic pole 59 has a flange portion 59a protruding from the upper end thereof (outwardly) and sandwiched between the upper surface of the coil bobbin 52 and the lower surface of (the ceiling portion 55a of) a housing 55, which will be described later, to form the coil bobbin 52. It is fixedly arranged between it and the plunger 58.

A resin mold cover 54 is provided so as to cover the coil bobbin 52 (and the solenoid coil 51 mounted on the coil bobbin 52), and the solenoid coil 51, the coil bobbin 52, and the suction element 53 are provided outside the mold cover 54. Also, the plunger 58 and the like are covered with a generally gate-shaped housing 55.

More specifically, the housing 55 is made of a magnetic material (for example, iron) in which a yoke that surrounds the outer periphery of the coil device 49 including the solenoid coil 51, the coil bobbin 52, and the mold cover 54 is integrated. As is clear from FIG. 1 and FIG. 3, the housing 55 includes a rectangular flat plate-shaped ceiling portion 55a that covers the upper portion of the mold cover 54 so as to close the ceiling portion of the plunger chamber 60, and the ceiling portion 55a. A side leg portion 55b extending downward from both side portions of the portion 55a and covering a side portion (both side portions) of the mold cover 54, and a valve is provided via a mounting leg 55c provided at a lower end of the side leg portion 55b. It is fixed to (the upper part of) the main body 10. In the illustrated example, the housing 55 has the flange portion 14b of the lid member 14 sandwiched between the mounting leg 55c of the housing 55 and the upper portion of the valve body 10 (in other words, the flange portion of the lid member 14). By fixing the mounting leg 55c of the housing 55 to the mounting portion 10a of the valve body 10 with bolts 15 (while pinching the pressure of 14b), the lid member 14 (of the flange portion 14b) and the lid member 14 ( Is attached to the valve body 10 in a state of being (magnetically) connected to the flange portion 14b).

A space surrounded by the ceiling portion 55a of the housing 55, the upper portion of the mold cover 54, and the flange portion 59a of the magnetic pole 59 (specifically, an annular shape provided outside the flange portion 59a of the magnetic pole 59 on the upper surface of the mold cover 54). A seal is provided in each of the groove 54a) and between the lower portion of the mold cover 54 and the ceiling portion 14a of the lid member 14 (specifically, an annular groove 54b provided near the inner circumference of the lower surface of the mold cover 54). The O-rings 61 and 62 as members are attached in a compressed state.

Further, a connector portion 56 is integrally formed on (the upper end side portion of) the mold cover 54, and an external terminal 57 for energizing the solenoid coil 51 is projectingly provided inside the connector portion 56.

A stepped shaft-shaped pilot valve element 40 that opens and closes the pilot passage 39 of the main valve element 20 according to the energization state of the solenoid coil 51 is connected to the plunger 58 disposed in the plunger chamber 60. The pilot valve body 40 may be made of resin or metal, for example, but resin is preferable because it is lighter.

The pilot valve body 40 has an upper small-diameter portion 41 inserted into an upper small-diameter insertion hole 58a of a plunger 58 from the upper side, an upper end side of which is press-fitted into a lower large-diameter insertion hole 58b of the plunger 58, and a lower end side thereof is an upper portion of a suction element 53. The intermediate body portion 42 is inserted through the small-diameter insertion hole 53a, and the lower large-diameter portion 43 is inserted in the lower large-diameter insertion hole 53b of the suction element 53. The outer diameter of the lower large diameter portion 43 is slightly larger than the passage diameter of the pilot passage 39 of the main valve body 20 and slightly smaller than the outer diameter of the upper seal portion 24 of the diaphragm 21 constituting the main valve body 20. Is set to.

On the other hand, a spring insertion groove 53c having one end (lower end) closed and the other end (upper end) opened is formed on the inner peripheral surface of (the upper small-diameter insertion hole 53a of) the suction element 53. A compression coil spring 46 (externally inserted into the intermediate body portion 42 of the pilot valve body 40 is provided between the upward step surface (lower spring receiving surface) of the spring insertion groove 53c and the lower surface of the plunger 58. ) Disguised. The urging force of the compression coil spring 46 urges the plunger 58 in a direction away from the suction element 53 (upward direction).

Here, in the illustrated example, the inner circumferential step formed between the upper small diameter fitting hole 53a and the lower large diameter fitting hole 53b of the suction element 53, the intermediate body portion 42 of the pilot valve body 40 and the lower large diameter fitting hole 53b. A stopper that restricts the upward movement of the pilot valve body 40 due to the biasing force of the compression coil spring 46 (in other words, determines the upper movement limit of the pilot valve body 40) by the outer peripheral step formed between the diameter portion 43 and the diameter portion 43. Although the mechanism is formed, it is a matter of course that the stopper mechanism is not limited to the above configuration.

A packing (piston ring) 47 made of, for example, rubber or a synthetic resin such as Teflon (registered trademark) is attached to the upper outer circumference (the annular groove provided in) of the lower large diameter portion 43 of the pilot valve body 40. ing.

Further, in this example, the lower portion of the lower large-diameter portion 43 of the pilot valve body 40 is formed in a cylindrical shape, and a tapered surface (also referred to as a chamfered portion) 43b formed of a truncated cone surface is formed on the inner periphery of the lower end of the cylindrical portion 43a. Is formed, and the tip (outer end) portion of the tapered surface 43b is brought into contact with and separated from the pilot valve seat 39a formed in (the upper seal portion 24 of the diaphragm 21 of) the main valve body 20 to open/close the pilot passage 39. The pilot valve body portion 40a is configured to operate.

In the illustrated example, the outlet 12 of the valve body 10, the main valve body 20 (the pilot passage 39 thereof), the coil bobbin 52 (the tubular body portion 52a thereof), the suction element 53, the plunger 58, the magnetic pole 59, and the pilot valve body. 40 and the like are arranged on the same axis O.

In the pilot type solenoid valve 1 having such a structure, when the solenoid coil 51 is energized (the inner peripheral side of the solenoid coil 51 and the inner side of the solenoid coil 51 via the suction element 53, the plunger 58, the housing 55, the lid member 14, etc. The magnetic field generated by the solenoid coil 51 (with the magnetic path formed on the outer peripheral side) excites the attractor 53 and the plunger 58, and as shown in FIG. 4A, the plunger 58 resists the biasing force of the compression coil spring 46. It is sucked by the suction element 53 and moves downward, the pilot valve body 40 is pushed down accordingly, and the pilot valve body portion 40a of the pilot valve body 40 is a pilot valve of the pilot passage 39 provided in the main valve body 20. The pilot passage 39 is closed by being pressed (sit down) to the seat 39a. At the same time, the pilot valve body 40 pushes the main valve body 20 downward (in the valve closing direction) (against the elastic force (pushing force) of the diaphragm 21 of the main valve body 20), so that the outlet 12 is also closed. ..

Therefore, at this time, the high-pressure fluid introduced into the main valve chamber 17 from the inflow port 11 is not led out to the outflow port 12, but this high-pressure fluid passes through the pressure supply passage 19 provided in the main valve body 20 to generate the back pressure. Since it is introduced into the chamber 18, the back pressure chamber 18 also has a high pressure, and the main valve body portion 20a of the main valve body 20 is strongly pressed against the main valve seat 12a of the outflow port 12.

On the other hand, when the solenoid coil 51 is deenergized from this closed state, that is, when the solenoid coil 51 is not energized, as shown in FIG. 4B, the pilot valve body 40 is moved by the urging force of the compression coil spring 46. It is pushed up together with 58 and moves upward, the pilot valve body portion 40a of the pilot valve body 40 is separated from the pilot valve seat 39a, and the pilot passage 39 is opened.

As a result, the fluid (pressure) in the back pressure chamber 18 is led (released) to the outflow port 12 through the pilot passage 39, the pressure in the back pressure chamber 18 decreases, and the inflow port 11 and the main valve chamber 17 (high pressure). The force that pushes up the main valve body 20 (the force that opens the valve) due to the pressure difference between the back pressure chamber 18 (low pressure) and the elastic force of the diaphragm 21 of the main valve body 20 pushes down the main valve body 20 ( 4C, the main valve body 20 is pushed up (until the stopper 33 contacts the ceiling portion of the storage chamber 16 (that is, the ceiling portion 14a of the lid member 14)) as shown in FIG. 4C. , The outlet 12 opens.

As described above, in the pilot-type solenoid valve (pilot-type control valve) 1 of the present embodiment, the diaphragm 21 made of the elastic member is brought into contact with and separated from the pilot valve body 40a of the pilot valve body 40 that opens and closes the pilot passage 39. Since the pilot valve seat 39a is integrally provided, the step of attaching the rubber valve element (sealing member) to the pilot valve element 40 driven up and down by the electromagnetic actuator (elevation drive device) 50 by caulking is unnecessary. The number of assembly steps and the number of parts are small.

Further, since the diaphragm 21 and the reinforcing member 30 that retains the rigidity of the diaphragm 21 are integrated by insert molding or the like, the step of assembling the diaphragm 21 and the reinforcing member 30 becomes unnecessary.

Further, since the reinforcing member 30 is disposed inside the elastically deforming portion 23 at the peripheral edge of the diaphragm 21 and does not contact the elastically deforming portion 23, the processing accuracy of the reinforcing member 30 does not affect the deformation behavior of the diaphragm 21. Another advantage is that the control accuracy of the pilot solenoid valve (pilot control valve) 1 can be secured.

In the above-described embodiment, the electromagnetic actuator (solenoid) 50 that uses electromagnetic force is adopted as the elevating/lowering device for elevating and lowering the pilot valve body 40. However, the electric motor (stepping motor) raises and lowers the pilot valve body. Of course, it may be driven.

In addition, in the above-described embodiment, the main valve body (diaphragm valve body) 20 having the diaphragm 21 is adopted, but as the main valve body 20, other types (for example, piston type) of main valve bodies can be applied. Not to mention in detail.

1 Pilot type solenoid valve (pilot type control valve)
10 valve body 10b diaphragm receiving part 11 inflow port 12 outflow port 12a main valve seat 13 cylindrical part 14 lid member 16 storage chamber 17 main valve chamber 18 back pressure chamber 19 pressure supply passage 20 main valve body 20a main valve body portion 21 diaphragm 22 Lower seal part (one side seal part)
23 Elastic Deformation Part 24 Upper Seal Part (Other Side Seal Part)
25 connecting portion 30 reinforcing member 32 through hole 33 stopper 39 pilot passage 39a pilot valve seat 40 pilot valve body 40a pilot valve body portion 41 upper small diameter portion 42 intermediate body portion 43 lower large diameter portion 46 compression coil spring 47 packing (piston ring)
49 Coil device 50 Electromagnetic actuator (elevation drive device)
51 Solenoid coil 52 Coil bobbin 53 Suction element 54 Mold cover 55 Housing 58 Plunger 59 Magnetic pole 59a Flange portion 60 Plunger chamber 61 O-ring 62 O-ring

Claims (13)

A valve body provided with an inflow port and an outflow port, a main valve body for opening and closing the outflow port, the main valve body is arranged, and a main valve chamber and a back pressure chamber are provided by the main valve body. And a pressure supply passage for supplying the pressure of the main valve chamber or the inflow port to the back pressure chamber, and the main valve body is provided with the pressure of the back pressure chamber. A pilot passage for escaping to the main valve body is opened/closed by opening/closing the pilot passage by a pilot valve body that is driven up and down by an elevator drive device, and the main valve body opens/closes the outlet in response to the pilot valve body. Is a pilot type control valve,
The main valve body is made of an elastic member, and includes a diaphragm provided with a pilot valve seat that opens and closes the outflow port and contacts and separates the pilot valve body , and a reinforcing member for holding the rigidity of the diaphragm. Yes, and
The diaphragm is formed on one surface of the reinforcing member and has one side seal portion having a main valve body portion that opens and closes the outflow port, and is extended to an outer periphery of the one side seal portion and fixed to the valve body. An elastically deformable portion, the other side seal portion formed on the other surface of the reinforcing member and having the pilot valve seat, and a connecting portion connecting the one side seal portion and the other side seal portion,
Wherein the reinforcing member, the pilot control valve characterized that you have a stopper is provided to determine the maximum lift position of the main valve body. A valve body provided with an inflow port and an outflow port, a main valve body for opening and closing the outflow port, the main valve body is arranged, and a main valve chamber and a back pressure chamber are provided by the main valve body. And a pressure supply passage for supplying the pressure of the main valve chamber or the inflow port to the back pressure chamber, and the main valve body is provided with the pressure of the back pressure chamber. A pilot passage for escaping to the main valve body is opened/closed by opening/closing the pilot passage by a pilot valve body that is driven up and down by an elevator drive device, and the main valve body opens/closes the outlet in response to the pilot valve body. Is a pilot type control valve,
The main valve body is made of an elastic member, and includes a diaphragm provided with a pilot valve seat that opens and closes the outflow port and contacts and separates the pilot valve body , and a reinforcing member for holding the rigidity of the diaphragm. Have,
The diaphragm is formed on one surface of the reinforcing member and has one side seal portion having a main valve body portion that opens and closes the outflow port, and is extended to an outer periphery of the one side seal portion and fixed to the valve body. An elastically deformable portion, the other side seal portion formed on the other surface of the reinforcing member and having the pilot valve seat, and a connecting portion connecting the one side seal portion and the other side seal portion ,
Said pressure supply passage, pilot control valve, characterized in that it is constituted by the one side communication hole which is opened to the diaphragm and the reinforcing member has been the other side communication hole opened in. The pilot control valve according to claim 1 or 2, wherein the diaphragm and the reinforcing member are integrated. The pilot type control valve according to claim 3, wherein the diaphragm and the reinforcing member are integrated by insert molding. The pilot control valve according to claim 2 , wherein the reinforcing member is provided with a stopper that determines a maximum lift position of the main valve body. The pilot type control valve according to claim 1 or 5, wherein the stopper is formed integrally with or separately from the reinforcing member. The reinforcing member, the pilot control valve according to any one of claims 1 6, characterized in that it is disposed inwardly of the elastic deformation portion provided on the periphery of the diaphragm. The pilot type control valve according to any one of claims 1 to 7, wherein the connecting portion is formed in a through hole provided in the reinforcing member. The pilot type control valve according to claim 8, wherein the pilot valve seat is provided inside the connecting portion of the other side seal portion. The pilot type control valve according to claim 8 or 9, wherein the main valve body portion is provided outside the connecting portion in the one-side seal portion. The pilot control valve according to any one of claims 1 to 10, wherein the reinforcing member is made of resin or metal. The pilot type control valve according to any one of claims 1 to 11 , wherein the pilot valve element is made of resin or metal. The pilot type control valve according to any one of claims 1 to 12 , wherein the lifting drive device is configured by an electromagnetic actuator or an electric motor.

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