JP6879556B2 - Pilot control valve - Google Patents

Description

The present invention relates to a pilot type control valve suitable for use in a heat pump type air-conditioning system or the like, and in particular, moves the pilot valve body up and down and responds to the pilot valve body to make a large-diameter main valve port a main valve. It relates to a pilot type control valve that is designed to be opened and closed by the body.

As a pilot type solenoid valve in which a pilot valve body is driven by an electromagnetic actuator (solenoid) 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, Patent Document 1 As described in the above, a piston-type main valve body and an insertion / insertion chamber in which the main valve body is slidably fitted and separated into a back pressure chamber and a main valve chamber by the main valve body. The main valve body is provided with a pilot passage for releasing the pressure of the back pressure chamber to the outlet, and the pilot passage is opened and closed by the pilot valve body driven up and down by the electromagnetic actuator. Is known.

Japanese Patent No. 6111082

By the way, in the conventional pilot type solenoid valve as described in Patent Document 1, a metal pilot valve body having a seal member attached to the tip is normally press-fitted into a plunger driven up and down by an electromagnetic actuator. It is connected and fixed by caulking or the like, and a compression coil spring as an urging member is compressed between the plunger and the aspirator to urge the plunger (and the pilot valve body) in a direction away from the aspirator.

Therefore, in the above-mentioned conventional pilot solenoid valve, the strength (rigidity) of the pilot valve body itself connected and fixed to the plunger is required, which causes an increase in weight and attracts the plunger (and the pilot valve body) to the attractor side. There was a problem that the suction power of the Further, a process of connecting and fixing the pilot valve body to the plunger such as a press-fitting process and a caulking process is required, which increases the number of assembly steps and complicates the assembly process.

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 that can contribute to weight reduction, reduce assembly man-hours, and improve assemblability. The purpose is to do.

In order to achieve the above object, the pilot type control valve according to the present invention basically includes 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. The valve body is arranged, and the storage chamber partitioned by the main valve body into the main valve chamber and the back pressure chamber, and the pressure of the main valve chamber or the inflow port are supplied to the back pressure chamber. A pressure supply passage is provided, and the main valve body is provided with a pilot passage for releasing the pressure of the back pressure chamber to the outlet, and the pilot passage is opened and closed by a pilot valve body driven up and down by an electromagnetic actuator. As a result, the outlet is opened and closed by the main valve body in response to the pilot valve body, and is urged between the receiving member provided on the pilot valve body and the attractor of the electromagnetic actuator. A member is interposed, the pilot valve body is pressed against the plunger of the electromagnetic actuator by the urging force of the urging member, the plunger is urged in a direction away from the suction element, and the receiving member is , The upper surface is in contact with the pilot valve body, the lower surface is in contact with the upper end of the urging member, and is arranged in an insertion hole provided in the plunger. .. Further, in the pilot type control valve according to the present invention, basically, 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 are arranged. In addition, it is provided with 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 inflow port to the back pressure chamber. The main valve body is provided with a pilot passage for releasing the pressure of the back pressure chamber to the outlet, and the pilot valve is opened and closed by a pilot valve body driven up and down by an electromagnetic actuator. The outlet is opened and closed by the main valve body in response to the body, and an urging member is interposed between the receiving member provided on the pilot valve body and the suction element of the electromagnetic actuator. The pilot valve body is pressed against the plunger of the electromagnetic actuator by the urging force of the urging member, and the plunger is urged in a direction away from the suction element, and the pilot valve body is pressed against the suction element. Inserted, the pilot valve body has an outer peripheral step, the suction element has an inner peripheral step, and the urging member is attached by the outer peripheral step of the pilot valve body and the inner peripheral step of the suction element. It is characterized in that a stopper mechanism for determining the movement limit of the ascending drive of the pilot valve body by the force is provided.

In a preferred embodiment, the receiving member is provided integrally or separately from the pilot valve body.

In another preferred embodiment, the receiving member is mounted in an outer peripheral groove provided in the pilot valve body.

The pilot valve body is preferably made of resin.

The receiving member is preferably made of a magnetic material.

According to the present invention, an urging member is interposed between a receiving member provided on the pilot valve body and a suction element, and the urging force of the urging member presses the pilot valve body against the plunger to cause the plunger. Since it is urged away from the attractor, it is not necessary to connect and fix the pilot valve body to the plunger by press fitting, caulking, etc., and the strength (rigidity) of the pilot valve body itself can be suppressed to a low level, so weight increase can be avoided. .. Further, since the suction force required for the operation of the plunger and the pilot valve body can be reduced, the weight can also be reduced. Further, since the step of connecting and fixing the pilot valve body to the plunger is not required, the assembling man-hours can be reduced, the assembling process can be simplified, and the assembling property can be improved.

The vertical sectional view which shows one Embodiment of the pilot type control valve (pilot type solenoid valve) which concerns on this invention. The perspective view of the main valve body shown in FIG. FIG. 2A is a perspective view of a reinforcing member (state before integral molding) shown in FIG. 2A. FIG. 3 is a perspective view of the housing shown in FIG. FIG. 5 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, and is a diagram showing a valve closed state (pilot valve body: closed, main valve body: closed). FIG. 5 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 state in which the pilot passage is open (pilot valve body: open, main valve body: closed). FIG. 5 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, and is a diagram 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 vertical cross-sectional view showing an embodiment of a pilot solenoid valve as a pilot control valve according to the present invention. FIG. 1 is a cross-sectional view taken along a plane passing through the center of the connector portion 56 on the left side of the O line toward the paper surface, and a cross-sectional view of a plane perpendicular to the paper surface on the right side of the O line.

In addition, in this specification, the description indicating the position and direction such as up / down, left / right, front / back, etc. is added for convenience according to the drawing in order to avoid complicated explanation, and the position and direction in the actual use state. Does not always point to. In the present specification, the side on which the electromagnetic actuator (solenoid) as the elevating 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 gap formed between the members, the separation distance between the members, etc. are larger than the dimensions of each constituent member in order to facilitate understanding of the invention and for convenience in drawing. Or it may be drawn small.

The pilot solenoid valve 1 of the illustrated embodiment is used in, for example, a heat pump type air-conditioning system such as a car air conditioner, and mainly includes a short cylindrical valve body 10 with a bottom having an inflow port 11 and an outflow port 12. It is provided with an electromagnetic actuator (elevating drive device) 50 provided on the upper side of the valve body 10.

At the center of the bottom of the valve body 10, a cylindrical portion 13 provided with an outlet 12 with a main valve seat 12a is formed (in the illustrated example, it is integrally formed) and is orthogonal to the outlet 12. A horizontal hole-shaped inflow port 11 is provided on the side thereof.

A lid member 14 made of a roughly dome-shaped magnetic metal (for example, iron or the like) is attached to the upper portion of the valve body 10 so as to close the upper surface opening of the valve body 10. The lower end of the attractor 53 of the electromagnetic actuator 50, which will be described later, is fitted in the substantially center of the ceiling portion 14a of the lid member 14, and the pilot valve body 40 (lower large diameter portion 43) is inserted into the fitting. A hole 14c is provided. Further, a flange portion 14b extends (downward) on the outer peripheral portion of the ceiling portion 14a, and the lid member 14 is fixed to the valve body 10 (upper portion) via the flange portion 14b. In the illustrated example, the lid member 14 is fastened and fixed to a plurality of mounting portions 10a integrally provided on the outer circumference of the valve body 10 and substantially symmetrically with respect to the axis O by fastening the flange portions 14b of the lid member 14 with bolts 15. By doing so, it can be assembled to the valve body 10.

In the valve body 10, specifically, in the storage chamber 16 defined by the valve body 10 and the lid member 14, the main valve body (also referred to as a diaphragm valve body) 20 having the diaphragm 21 is elastically deformably stored. The storage chamber 16 is divided into a main valve chamber 17 and a back pressure chamber 18 by the main valve body 20. In the central portion of the main valve body 20, a pilot passage (pilot valve port) 39 with a pilot valve seat 39a for releasing the pressure of the back pressure chamber 18 to the outlet 12 penetrates in the vertical direction (axis O direction). The pilot passage 39 is opened and closed by the pilot valve body portion 40a of the pilot valve body 40, which will be described later. Further, at a position separated from the central portion of the main valve body 20 (a position outside the outflow port 12), a pressure supply passage (equalization) for supplying the pressure of the main valve chamber 17 to the inflow port 11 to the back pressure chamber 18. 19 (also referred to as a pressure passage) is provided.

Specifically, the main valve body 20 is reinforced with a diaphragm 21 made of, for example, an elastic member such as rubber or Teflon (registered trademark), and a disk-shaped stopper 33 made of, for example, a hard resin or metal. It is composed of a member 30, and they are integrally formed by, for example, insert molding or the like. In this example, the diaphragm 21 and the reinforcing member 30 are integrated by insert molding, but the diaphragm 21 and the reinforcing member 30 may be fixed, for example, the diaphragm 21 may be partly part of the reinforcing member 30. A part of the above 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 easily understood by referring to FIGS. 2A and 2B together with FIG. ) Is formed, and a through hole 32 for passing an elastic member constituting the diaphragm 21 at the time of molding the main valve body 20 is formed around the center hole 31. In this example, four through holes 32 having a substantially fan shape in a plan view are provided around the center hole 31 of 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 in 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 for defining the above is projected. The stopper 33 prevents the pilot valve seat 39a provided on the main valve body 20 (diaphragm 21) 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 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 on the outside of the through holes 32 in the reinforcing member 30 at substantially equal angular intervals.

Although the stopper 33 is integrally formed with the reinforcing member 30 here, it may be formed separately from the reinforcing member 30 (in other words, as a separate part). Of course, 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 circumference of the reinforcing member 30 (in the example shown in FIGS. 2A and 2B, near the middle of the adjacent stoppers 33), an upper communication hole (also a pressure equalizing hole) constituting the pressure supply passage 19 (upper half) is formed. 34 is opened, and an introduction hole (shown in FIGS. 2A and 2B) is filled with a part of the elastic member constituting the diaphragm 21 in order to increase the adhesive force between the reinforcing member 30 and the diaphragm 21. In the example, 3) 35 are established.

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

A central hole 26 forming (the lower part of) the pilot passage 39 is provided in the central portion of the lower seal portion 22, and the inner circumference of the upper seal portion 24, the center hole 31 of the reinforcing member 30, and the lower portion thereof. The pilot passage 39 is formed by the central hole 26 of the side seal portion 22.

Further, in the vicinity of the outer periphery of the lower seal portion 22, a lower communication hole (also referred to as a pressure equalizing hole) 27 constituting the pressure supply passage 19 (lower half) is provided, and the lower seal portion 22 is provided with a lower communication hole (also referred to as a pressure equalizing hole) 27. The pressure supply passage 19 is formed by the lower communication hole 27 and the upper communication hole 34 of the reinforcing member 30. In the illustrated example, the upper communication hole 34 of the reinforcing member 30 is slightly smaller than the lower communication hole 27 of the lower seal portion 22, and the passage diameter of the pilot passage 39 (inner diameter of the upper seal portion 24, reinforcing member 30). The hole diameter of the center hole 31 and the hole diameter of the center hole 26 of the lower seal portion 22) are larger than the (minimum) passage diameter of the pressure supply passage 19 (here, the hole diameter of the upper communication hole 34 of the reinforcing member 30). It has been slightly enlarged.

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

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

As described above, in this example, the inflow port 11 or the main valve chamber 17 and the back are passed through the lower communication hole 27 of the lower seal portion 22 constituting the pressure supply passage 19 and the upper communication hole 34 of the reinforcing member 30. In a state where the pressure chamber 18 communicates with the pressure chamber 18, and therefore the pilot passage 39 is closed by the pilot valve body portion 40a of the pilot valve body 40, the inflow port 11, the main valve chamber 17, and the back pressure chamber 18 are connected. , High pressure fluid will be filled.

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

When the diaphragm 21 and the reinforcing member 30 as described above are integrally formed by, for example, insert molding, the rigidity of the diaphragm 21 (particularly, the main valve body portion 20a in the lower seal portion 22 and the upper side) is formed by the reinforcing member 30. The strength of the pilot valve seat 39a in the seal portion 24) will be maintained.

The electromagnetic actuator (solenoid) 50 is placed and fixed on the upper portion of 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 exteriorized, and a pair of flange portions that regulate variation of the solenoid coil 51 at the upper end portion and the lower end portion of the cylindrical body portion 52a. (Upper flange portion 52b, lower flange portion 52c) are integrally formed.

A cylindrical plunger 58 made of magnetic metal and an aspirator 53 are vertically opposed to each other on the inner circumference of the coil bobbin 52 (cylindrical body portion 52a), and magnetic on the plunger 58 (outer circumference). A magnetic pole 59 made of a cylindrical body made of metal is exteriorized.

The cylindrical suction element 53 is arranged at the lower portion of the inner circumference of the coil bobbin 52 (cylindrical body portion 52a), and the lower portion of the suction child 53 is the lower end (opening) of the coil bobbin 52 (cylindrical body portion 52a). It protrudes from the lid member 14 and is internally fitted and fixed to the fitting hole 14c of the lid member 14 by press fitting, caulking or the like. The 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 movably arranged in the vertical direction (axis O direction) on the upper part of the inner circumference of the coil bobbin 52 (cylindrical body portion 52a) (with a magnetic pole 59 sandwiched between them). In other words, a cylindrical magnetic pole 59 is internally fitted in the upper part of the inner circumference of the coil bobbin 52 (cylindrical body portion 52a), and the plunger 58 is interpolated inside the magnetic pole 59 so as to be movable along the axis O direction. ing. That is, here, the plunger 58 is arranged so as to be able to move up and down in the hollow portion formed inside the coil bobbin 52 (cylindrical body portion 52a) (inside the coil device 49 in which the solenoid coil 51 is wound around the coil bobbin 52). The plunger chamber 60 is used, and the wall surface facing the hollow portion is used as the inner wall surface of the plunger chamber 60. The plunger 58 is provided with a stepped insertion hole (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 projecting from the upper end thereof (outwardly) sandwiched between the upper surface of the coil bobbin 52 and the lower surface of the housing 55 (ceiling portion 55a) described later, and the magnetic pole 59 and the coil bobbin 52. It is fixedly arranged between the plunger 58 and the plunger 58.

A resin mold cover 54 is arranged so as to cover the coil bobbin 52 (and the solenoid coil 51 externally attached to the coil bobbin 52), and the solenoid coil 51, the coil bobbin 52, the suction element 53, and the outside of the mold cover 54. And the plunger 58 and the like are covered with a roughly gate-shaped housing 55.

More specifically, the housing 55 is made of a magnetic material (for example, iron or the like) in which a yoke surrounding 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 can be clearly seen by referring to FIG. 3 together with FIG. 1, the housing 55 includes a rectangular flat 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. It is composed of side leg portions 55b extending downward from both side portions of the portion 55a and covering the side portions (both side portions) of the mold cover 54, and a valve is provided via a mounting leg 55c provided at the lower end of the side leg portion 55b. It is fixed to the main body 10 (upper part). In the illustrated example, the housing 55 is in a state where the flange portion 14b of the lid member 14 is 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 fastening and fixing the mounting legs 55c of the housing 55 to the mounting portion 10a of the valve body 10 with bolts 15 (while sandwiching the 14b), the lid member 14 (flange portion 14b) and the lid member 14 ( It is assembled to the valve body 10 in a state of being (magnetically) connected to the flange portion 14b) of the above.

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). Seals 54a) and between the lower portion of the mold cover 54 and the ceiling portion 14a of the lid member 14 (specifically, the annular groove 54b provided near the inner circumference on the lower surface of the mold cover 54). The O-rings 61 and 62 as members are mounted in a compressed state.

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

A stepped shaft-shaped pilot valve body 40 that opens and closes the pilot passage 39 of the main valve body 20 according to the energized state of the solenoid coil 51 is connected to the plunger 58 arranged 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 is inserted into the upper small diameter insertion hole 58a of the plunger 58 from above, the upper end side is inserted into the lower large diameter insertion hole 58b of the plunger 58, and the lower end side is the upper part of the suction element 53. It includes an intermediate body portion 42 to be inserted into the small diameter fitting insertion hole 53a, and a lower large diameter portion 43 to be inserted into the lower large diameter fitting 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.

An annular outer peripheral groove 44 is provided on the upper outer periphery of the intermediate body portion 42 of the pilot valve body 40 (the portion inserted into the lower large-diameter insertion hole 58b of the plunger 58), and the outer peripheral groove 44 is provided with, for example, a half-circumferential washer. A ring-shaped spring receiver (receiving member) 45 having a structure in which two of the two are combined is fitted.

On the other hand, a spring insertion groove 53c is formed on the inner peripheral surface of the suction element 53 (upper small diameter fitting insertion hole 53a) with one end (lower end) closed and the other end (upper end) open. The pilot valve body 40 is always upward (upper spring receiving surface) between the upward stepped surface (lower spring receiving surface) of the spring insertion groove 53c and the lower surface (upper spring receiving surface) of the spring receiving 45 provided on the pilot valve body 40. The compression coil spring (urging member) 46 urging in the valve opening direction) is contracted (so as to be externally inserted into the intermediate body portion 42 of the pilot valve body 40). Due to the urging force of the compression coil spring 46, the pilot valve body 40 (the outer peripheral step formed between the upper small diameter portion 41 and the intermediate body portion 42) is inserted into the plunger 58 (upper small diameter insertion hole 58a and lower large diameter insertion hole 58a). It is pressed against the inner peripheral step formed between the hole 58b and connected to the plunger 58, and the plunger 58 is urged away from the suction element 53 (upward).

Here, in the illustrated example, the inner peripheral step formed between the upper small diameter fitting insertion hole 53a and the lower large diameter fitting insertion hole 53b of the suction element 53, and the intermediate body portion 42 and the lower large portion of the pilot valve body 40. A stopper that regulates the upward movement of the pilot valve body 40 due to the urging force of the compression coil spring 46 (in other words, determines the upward 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 a mechanism is formed, it is natural that this stopper mechanism is not limited to the above configuration.

Further, the spring receiver 45 provided on the pilot valve body 40 may be made of, for example, metal or resin, but by making the pilot valve body 40, for example, of a magnetic material, the suction force of the pilot valve body 40 toward the attractor 53 is increased. be able to. Further, in this example, the spring receiver 45 is formed separately from the pilot valve body 40 (as a separate component), but it is needless to say that the spring receiver 45 may be formed integrally with the pilot valve body 40.

A packing (piston ring) 47 made of, for example, rubber or a synthetic resin such as Teflon (registered trademark) is mounted on 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 conical base surface is formed on the inner circumference 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 on the main valve body 20 (the upper seal portion 24 of the diaphragm 21) to open and close the pilot passage 39. It is said that the pilot valve body portion 40a is used.

In the illustrated example, the outlet 12 of the valve body 10, the main valve body 20 (pilot passage 39), the coil bobbin 52 (cylindrical body portion 52a), 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 solenoid valve 1 having such a configuration, when the solenoid coil 51 is energized, the inner peripheral side of the solenoid coil 51 and the inner peripheral side of the solenoid coil 51 via the aspirator 53, the plunger 58, the housing 55, the lid member 14, etc. The magnetic field generated by the solenoid coil 51 (a magnetic path is 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 urging force of the compression coil spring 46. It is sucked by the suction element 53 and moves downward, and accordingly, the pilot valve body 40 is pushed down and the pilot valve body portion 40a of the pilot valve body 40 is provided in the main valve body 20 as a pilot valve in the pilot passage 39. The pilot passage 39 is closed by being pressed (seat) against 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 is back pressure through the pressure supply passage 19 provided in the main valve body 20. Since it is introduced into the chamber 18, the back pressure chamber 18 also becomes 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 energization of the solenoid coil 51 is turned off from this valve closed state, that is, when the solenoid coil 51 is not energized, the pilot valve body 40 is a plunger due to the urging force of the compression coil spring 46 as shown in FIG. 4B. It is pushed up together with 58 and moves upward, and the pilot valve body portion 40a of the pilot valve body 40 is separated from the pilot valve seat 39a to open the pilot passage 39.

As a result, the fluid (pressure) in the back pressure chamber 18 is led out (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 (force to open the valve) due to the differential pressure generated 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 (force to open the valve). The valve closing force) is overcome, and as shown in FIG. 4C, the main valve body 20 is pushed up (until the stopper 33 comes into contact with the ceiling portion of the storage chamber 16 (that is, the ceiling portion 14a of the lid member 14)). , The outlet 12 opens.

As described above, in the pilot solenoid valve 1 of the present embodiment, the compression coil spring (biasing member) 46 is interposed between the spring receiver (receiving member) 45 provided on the pilot valve body 40 and the suction element 53. The pilot valve body 40 is pressed against the plunger 58 by the urging force of the compression coil spring 46, and the plunger 58 is urged away from the suction element 53. Therefore, the pilot valve body 40 is pressed into the plunger 58 by press fitting, caulking, or the like. Since it is not necessary to connect and fix the pilot valve body 40 and the strength (rigidity) of the pilot valve body 40 itself is suppressed to a low level, an increase in weight can be avoided. Further, since the suction force required for the operation of the plunger 58 and the pilot valve body 40 can be reduced, the weight can also be reduced. Further, since the step of connecting and fixing the pilot valve body 40 to the plunger 58 becomes unnecessary, the assembling man-hours can be reduced, and the assembling process can be simplified to improve the assembling property.

In the above embodiment, the main valve body (diaphragm valve body) 20 having the diaphragm 21 is adopted, but other types (for example, piston type) of the main valve body can be applied as the main valve body 20. Needless to say in detail.

Further, in the above embodiment, the electromagnetic actuator (solenoid) 50 using electromagnetic force is adopted as the elevating drive device for raising and lowering the pilot valve body 40, but the electric actuator as the elevating drive device is used instead of the plunger 58. A member that moves up and down by an electric motor (stepping motor) is used, and a pilot valve body 40a provided at the lower end of the valve shaft is inserted while inserting the upper end portion of the valve shaft (member provided with the pilot valve body 40) into this member. It may be used for an electric valve that is driven up and down. In this case, it is preferable that the compression coil spring 46 as an urging member is arranged between the valve body side (or the elevating drive device side fixed to the valve body) and the spring receiver provided on the valve shaft.

1 Pilot solenoid valve 10 Valve body 10b Diaphragm receiving part 11 Inflow port 12 Outlet 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 part 21 Diaphragm 22 Lower seal part 23 Elastic deformation part 24 Upper seal part 25 Connecting part 30 Reinforcing member 32 Through hole 33 Stopper 39 Pilot passage 39a Pilot valve seat 40 Pilot valve body 40a Pilot valve body part 41 Upper small diameter part 42 Intermediate Body 43 Lower large diameter 44 Outer groove 45 Spring receiver (receiving member)
46 Compression coil spring (biasing member)
47 Packing (piston ring)
49 Coil device 50 Electromagnetic actuator (elevating drive device)
51 Solenoid coil 52 Coil bobbin 53 Attractor 54 Mold cover 55 Housing 58 Plunger 59 Pole 59a Flange part 60 Plunger chamber 61 O-ring 62 O-ring

Claims (6)

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 are arranged, and the main valve body provides a main valve chamber and a back pressure chamber. It is provided with a storage chamber partitioned into the main valve chamber 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 pressure of the back pressure chamber is applied to the main valve body to the outflow port. A pilot passage is provided for escape to, and by opening and closing the pilot passage with a pilot valve body driven up and down by an electromagnetic actuator, the outlet is opened and closed by the main valve body in response to the pilot valve body. It is a pilot type control valve that has been made
An urging member is interposed between the receiving member provided on the pilot valve body and the attractor of the electromagnetic actuator, and the urging force of the urging member causes the pilot valve body to move to the plunger of the electromagnetic actuator. The plunger is urged away from the aspirator.
The receiving member is formed separately from the pilot valve body, the upper surface is in contact with the pilot valve body, the lower surface is in contact with the upper end of the urging member, and is arranged in an insertion hole provided in the plunger. A pilot type control valve characterized by. 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 are arranged, and the main valve body provides a main valve chamber and a back pressure chamber. It is provided with a storage chamber partitioned into the main valve chamber 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 pressure of the back pressure chamber is applied to the main valve body to the outflow port. A pilot passage is provided for escape to, and by opening and closing the pilot passage with a pilot valve body driven up and down by an electromagnetic actuator, the outlet is opened and closed by the main valve body in response to the pilot valve body. It is a pilot type control valve that has been made
An urging member is interposed between the receiving member provided on the pilot valve body and the attractor of the electromagnetic actuator, and the urging force of the urging member causes the pilot valve body to move to the plunger of the electromagnetic actuator. The plunger is urged away from the aspirator.
The pilot valve body is inserted into the suction element, and the pilot valve body is inserted into the suction element.
The pilot valve body has an outer peripheral step, and the suction element has an inner step.
A stopper mechanism is provided that determines the movement limit of the ascending drive of the pilot valve body by the urging force of the urging member by the outer peripheral step of the pilot valve body and the inner peripheral step of the suction element. Pilot type control valve. The pilot-type control valve according to claim 2 , wherein the receiving member is provided integrally or separately from the pilot valve body. The pilot-type control valve according to claim 1 or 2, wherein the receiving member is mounted in an outer peripheral groove provided in the pilot valve body. The pilot type control valve according to any one of claims 1 to 4, wherein the pilot valve body is made of resin. The pilot-type control valve according to any one of claims 1 to 5, wherein the receiving member is made of a magnetic material.

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