JP2019039509A - Pilot operated solenoid valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pilot type solenoid valve capable of effectively reducing the size and weight of a physique, ensuring sealing property, reducing the number of parts and product cost, and the like. SOLUTION: A ceiling portion of a plunger chamber 60 in which a plunger 58 is arranged so as to be able to move up and down is formed by a housing 55 integrally formed with a yoke surrounding an outer circumference of a coil device 49 composed of a solenoid coil 51, a coil bobbin 52 and a mold cover 54. It is blocked. The inner fitting portion 59b of the convex magnetic pole portion 59 provided in the housing 55 is fitted inside the plunger 58 (upper large diameter insertion hole 58a). [Selection diagram] Fig. 1

Description

  The present invention relates to a pilot-type solenoid valve suitable for use in a heat pump type air conditioning system and the like, and more particularly, a pilot valve body is driven up and down by an electromagnetic actuator, and a large-diameter main valve is responsive to the pilot valve body. The present invention relates to a pilot-type solenoid valve whose opening and closing is configured with a main valve body.

  As a pilot solenoid valve in which a pilot valve body is driven by an electromagnetic actuator (solenoid) and a main valve opening having a large diameter is opened and closed by the main valve body in response to the pilot valve body, for example, Patent Document 1 As described above, a piston-type main valve body, and the main valve body are slidably inserted and inserted into the back pressure chamber and the main valve chamber by the main valve body, A pilot passage for releasing the pressure of the back pressure chamber to the outlet is provided in the main valve body, and the pilot passage is opened and closed by a pilot valve body that is driven up and down by the electromagnetic actuator. Is known.

  In the conventional pilot solenoid valve described in Patent Document 1, the space (plunger chamber) in which the plunger driven up and down by the electromagnetic actuator is arranged is hermetically sealed (seal) with a cup-shaped can (pipe). Has been.

  Further, as a configuration that does not use a relatively expensive can as described above, as described in Patent Document 2, for example, a mold resin (outer mold) that covers the outside of a coil device in which a solenoid coil is wound around a coil bobbin It is proposed to close the upper part of the plunger chamber.

Japanese Patent No. 6111082 No. 03-019656

  By the way, in the conventional pilot type solenoid valve as described in the above-mentioned Patent Document 2, the magnetic flux density greatly changes depending on the position of the plunger (relative position with respect to the yoke and the attractor) arranged in the plunger chamber. Since the suction force of the plunger changed (decreased), there was a dislike that the physique was enlarged.

  In addition, a yoke surrounding the outer periphery of the coil device is required separately, and the number of seal portions (seal members) for hermetically sealing the plunger chamber increases, leading to an increase in the number of parts and product costs. It was.

  The present invention has been made in view of the above circumstances, and its purpose is to effectively reduce the size and weight of the physique, ensure sealing performance, reduce the number of parts and product cost, etc. An object of the present invention is to provide a pilot type solenoid valve that can be used.

  In order to achieve the above object, a pilot solenoid valve according to the present invention basically includes a valve body provided with an inlet and an outlet, a main valve body for opening and closing the outlet, and the main valve body. A valve body is disposed, a storage chamber partitioned by the main valve body into a main valve chamber and a back pressure chamber, and a pressure for supplying the main valve chamber or the inlet pressure to the back pressure chamber 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 that is driven up and down by an electromagnetic actuator. Accordingly, the outlet is opened and closed by the main valve body in response to the pilot valve body, and the electromagnetic actuator is wound with a plunger, an attractor, and a solenoid coil connected to the pilot valve body. Carp disguised The bobbin has a coil device covered with a mold cover, and a wall surface facing a hollow portion formed in the coil device is used as an inner wall surface of a plunger chamber in which the plunger is arranged to be movable up and down. The ceiling portion of the plunger chamber is closed by a housing made of a magnetic material integrally formed with a yoke surrounding the outer periphery of the coil device, and the housing has a convex shape having an inner fitting portion that fits inside the plunger. The magnetic pole part is protrudingly provided.

  In a preferred aspect, a part of the inner fitting portion is fitted into the plunger at the lowered position of the plunger.

  In another preferred embodiment, the convex magnetic pole portion is in close contact with the housing and has a fixed portion formed larger than the outer diameter of the plunger and the inner fit formed smaller than the outer diameter of the plunger. A part.

  The convex magnetic pole part is preferably provided separately or integrally with the housing.

  In another preferred aspect, a first seal member is interposed between the coil device and the housing.

  In a further preferred aspect, the first seal member is mounted in a space defined by the coil device, the housing, and the convex magnetic pole portion.

  In another preferred aspect, the suction element disposed opposite to the plunger is fitted and fixed in a fitting hole provided in a lid member for forming the storage chamber, and the housing is attached to the lid member. Connected.

  In a further preferred aspect, the step portion formed on the suction element is fitted and fixed in the fitting hole of the lid member, and is defined by the step portion of the suction element, the lid member, and the coil device. A second seal member is mounted in the space to be formed.

  The stepped portion of the suction element is preferably fitted and fixed by press fitting into the fitting hole of the lid member.

  According to the present invention, the ceiling portion of the plunger chamber in which the plunger is disposed so as to be movable up and down is closed by the housing integrally formed with the yoke surrounding the outer periphery of the coil device, so that the separate yoke surrounding the outer periphery of the coil device is provided. Is eliminated, and the number of sealing portions for hermetically sealing the plunger chamber is small, so that the number of parts and product costs can be reduced while ensuring sealing performance.

  Further, since the inner fitting portion of the convex magnetic pole portion provided in the housing is fitted into the plunger, the volume of the magnetic pole is increased, and the plunger is lowered (at a position away from the ceiling portion of the housing). The magnetic path is secured and the attraction force when the plunger is lowered is increased, so that the size and weight of the physique can be reduced.

  In addition, the stepped portion formed in the suction element is fitted and fixed in the fitting hole of the lid member for forming the storage chamber, and is sealed in a space defined by the stepped portion, the lid member, and the coil device. Since the member is mounted, the sealing performance is improved and the sealing member itself can be downsized.

The longitudinal cross-sectional view which shows one Embodiment of the pilot type solenoid valve which concerns on this 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. The perspective view of the housing shown by FIG. It is a principal part expanded longitudinal sectional view used for operation | movement description of the pilot type solenoid valve shown by FIG. 1, and is a figure which shows a valve closing state (pilot valve body: closed, main valve body: closed). It is a principal part expanded longitudinal cross-sectional view with which the operation | movement description of the pilot type solenoid valve shown by FIG. 1 is shown, and is a figure which shows the state (Pilot valve body: Open, main valve body: Closed). It is a principal part expanded longitudinal cross-sectional view used for operation | movement description of the pilot type solenoid valve shown by FIG. 1, and is a figure which shows a valve opening state (pilot valve body: open, main valve body: open). The longitudinal cross-sectional view which shows the other example of the pilot type solenoid valve shown by FIG. FIG. 6 is a perspective view of the housing shown in FIG. 5.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a longitudinal sectional view showing an embodiment of a pilot solenoid valve according to the present invention. FIG. 1 is a cross-sectional view along a plane where the left side of the O line passes 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 a surface perpendicular to the paper surface.

  In this specification, descriptions representing positions and directions such as up and down, left and right, and front and rear are given for the sake of convenience in accordance with the drawings in order to avoid complicated explanation, and the positions and directions in the actual use state. Does not necessarily mean In this specification, the side on which an electromagnetic actuator (solenoid) as a lifting drive device is disposed is the upper side, and the side on which the valve body is disposed is the lower side.

  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 for easy understanding of the invention and for convenience of drawing. Or it may be drawn small.

  The pilot type electromagnetic valve 1 of the illustrated embodiment is used for a heat pump type air conditioning system such as a car air conditioner, for example, and mainly includes a short cylindrical valve body 10 with a bottom portion having an inlet 11 and an outlet 12; And an electromagnetic actuator 50 provided on the upper side of the valve body 10.

  In the center of the bottom portion 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, integrally formed), and so as to be orthogonal to the outlet 12. A lateral hole-shaped inlet 11 is provided on the side portion.

  A lid member 14 made of a substantially 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. A lower end (stepped portion 53d) of an attractor 53 of an electromagnetic actuator 50, which will be described later, is fitted in substantially the center of the ceiling portion 14a of the lid member 14, and a pilot valve body 40 (a lower large-diameter portion 43 thereof) is fitted. A fitting hole 14c to be inserted 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 to the plurality of mounting portions 10 a provided integrally with the outer periphery of the valve body 10 and substantially symmetrical with respect to the axis O with bolts 15. As a result, the valve body 10 is assembled.

  A main valve body (also referred to as a diaphragm valve body) 20 having a diaphragm 21 is housed in the valve body 10, specifically, in a housing chamber 16 defined by the valve body 10 and the lid member 14 so as to be elastically deformable. The storage chamber 16 is partitioned into a main valve chamber 17 and a back pressure chamber 18 by the main valve body 20. A pilot passage (pilot valve port) 39 with a pilot valve seat 39a for allowing the pressure in the back pressure chamber 18 to escape to the outlet 12 passes through the central portion of the main valve body 20 in the vertical direction (axis O direction). The pilot passage 39 is opened and closed by a pilot valve body portion 40a of the pilot valve body 40 described later. Further, a pressure supply passage (equalizing pressure) for supplying the pressure of the main valve chamber 17 to the inlet 11 to the back pressure chamber 18 is located at a position away from the center of the main valve body 20 (a position outside the outlet 12). (Also referred to as a pressure passage) 19 is provided.

  More specifically, the main valve body 20 is reinforced with a diaphragm 21 made of an elastic member such as rubber or Teflon (registered trademark) and a disk-like stopper 33 made of a hard resin or metal, for example. It is comprised with the member 30, and they are integrated and formed by insert molding etc., for example. In this example, the diaphragm 21 and the reinforcing member 30 are integrated by insert molding. However, the diaphragm 21 and the reinforcing member 30 may be fixed. For example, the diaphragm 21 is partially attached to the reinforcing member 30. A part of may be fitted or fixed with an adhesive.

  More specifically, the reinforcing member 30 is formed to have a larger diameter than the outlet 12, and as can be understood by referring to FIGS. 2A and 2B together with FIG. 1, the central portion of the pilot passage 39 ( A center hole 31 is formed, and a through hole 32 is formed around the center hole 31 for allowing the elastic member constituting the diaphragm 21 to pass when the main valve body 20 is molded. In this example, four through holes 32 having a substantially fan shape in 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 14 a of the lid member 14). A stopper 33 is provided so as to project. The stopper 33 prevents the pilot valve seat 39a provided on the main valve body 20 (the diaphragm 21) from colliding with the pilot valve body 40 and 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 described later. In this example, four substantially rectangular stoppers 33 are provided at substantially equal angular intervals outside the through holes 32 in the reinforcing member 30.

  Here, the stopper 33 is formed integrally with the reinforcing member 30, but may be formed separately from the reinforcing member 30 (in other words, as a separate part). Of course, the stopper may be formed, for example, on the diaphragm 21 or the ceiling 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 stopper 33), an upper communication hole (also referred to as a pressure equalizing hole) constituting the pressure supply passage 19 (upper half). 34), and an introduction hole (shown in FIGS. 2A and B) into which a part of the elastic member constituting the diaphragm 21 enters and is filled in order to increase the fixing 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 includes a relatively thick disc-shaped lower seal portion 22 formed on the lower surface side of the reinforcing member 30 and an outer periphery (that is, a diaphragm) of the lower seal portion 22. A relatively thin elastic deformation portion 23 extending to the peripheral edge of the reinforcing member 30, an annular upper seal portion 24 formed around the central hole 31 and on the through hole 32 on the upper surface side of the reinforcing member 30, and The connecting portion (four connecting portions in this example) 25 is formed in the through hole 32 of the reinforcing member 30 and connects the lower seal portion 22 and the upper seal portion 24.

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

  Further, a lower communication hole (also referred to as a pressure equalizing hole) 27 constituting a pressure supply passage 19 (lower half) is provided in the vicinity of the outer periphery of the lower seal portion 22. 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 (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 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 is slightly larger.

  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, an annular portion slightly inside the lower communication hole 27 and slightly outside the connecting portion 25), A main valve body 20a that opens and closes the outflow port 12 by contacting and separating from the outflow port 12 (the main valve seat 12a at the upper end of the outflow port 12). A pilot valve seat 39a in which an annular portion inside and slightly inside the connecting portion 25 is in contact with and separated from the pilot valve body 40 (the pilot valve body portion 40a at the lower end thereof) connected to the plunger 58 of the electromagnetic actuator 50. It is said.

  A diaphragm receiving portion 10 b is provided at the upper end of the valve body 10, and a main valve body 20 (diaphragm 21 thereof) is disposed so as to cover an upper surface opening of the valve body 10, and the diaphragm of the main valve body 20 is disposed. The outer peripheral portion of 21 (the elastically deforming portion 23) (more specifically, the thick portion formed on the outer periphery of the elastically deforming portion 23) is a diaphragm receiving portion 10b provided on 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, and the main valve chamber is located below the main valve body 20. 17 is formed.

  As described above, in this example, the inlet 11 or the main valve chamber 17 and the back are connected via 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. Therefore, when the pilot passage 39 is closed by the pilot valve body portion 40 a of the pilot valve body 40, the inlet 11, the main valve chamber 17, and the back pressure chamber 18 are in communication with the pressure chamber 18. The 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 or the inlet 11 to the back pressure chamber 18. Of course, it may be provided in the valve body 10 other than the valve body 20.

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

  An electromagnetic actuator (solenoid) 50 is mounted 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 cylindrical body portion 52a on which the solenoid coil 51 is externally mounted, 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 and lower flange portion 52c) are integrally formed. Here, the inner diameter of the cylindrical body portion 52a of the coil bobbin 52 is slightly larger than the diameter of the fitting hole 14c provided in the ceiling portion 14a of the lid member 14.

  On the inner periphery of the coil bobbin 52 (the cylindrical body portion 52a), a cylindrical plunger 58 made of a magnetic metal and an attractor 53 are arranged opposite to each other in the vertical direction.

  The cylindrical suction element 53 is disposed in the lower part of the inner periphery of the coil bobbin 52 (the cylindrical body part 52a), and a step part 53d having a reduced outer diameter is provided in the lower part of the suction element 53. The stepped portion 53d protrudes from the lower end (opening) of the coil bobbin 52 (the cylindrical body portion 52a), and the lower end portion (lower half portion in the illustrated example) of the stepped portion 53d is the fitting hole of the lid member 14. 14c is fitted and fixed by press fitting or the like. The suction element 53 is provided with stepped insertion holes (an upper small diameter insertion hole 53a and a lower large diameter insertion hole 53b) along the vertical direction (axis O direction) for inserting the lower part of the pilot valve body 40. ing.

  On the other hand, the plunger 58 is disposed (inserted) on the inner peripheral upper portion of the coil bobbin 52 (the cylindrical body portion 52a) so as to be movable in the vertical direction (axis O direction) with a slight gap. That is, here, the hollow portion formed inside the coil bobbin 52 (the cylindrical body portion 52a thereof) (in the coil device 49 in which the solenoid coil 51 is wound around the coil bobbin 52) is disposed so that the plunger 58 can be moved up and down. The wall surface facing the hollow portion is used as the inner wall surface of the plunger chamber 60. The plunger 58 has a step for inserting a lower part (inner fitting part 59b) of a convex magnetic pole part 59 of the housing 55 and an upper part (upper small diameter part 41, intermediate body part 42) of the pilot valve body 40, which will be described later. Insertion holes (upper large diameter insertion hole 58a, intermediate small diameter insertion hole 58b, lower middle diameter insertion hole 58c) are provided along the vertical direction (axis O direction).

  A resin mold cover 54 is disposed so as to cover the coil bobbin 52 (and the solenoid coil 51 sheathed on the coil bobbin 52), and on the outside of the mold cover 54, a solenoid coil 51, a coil bobbin 52, an attractor 53, The plunger 58 and the like are covered with a substantially 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 understood by referring to FIG. 3 together with FIG. 1, the housing 55 includes a rectangular flat plate-like ceiling portion 55 a 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. A side leg portion 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 via a mounting leg 55c provided at the lower end of the side leg portion 55b. It is fixed to (upper part of) the main body 10. In the illustrated example, the housing 55 is in a state in which 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 leg 55c of the housing 55 to the mounting portion 10a of the valve body 10 with bolts 15 (while pinching 14b), together with the lid member 14 (the flange portion 14b) and the lid member 14 ( The valve body 10 is assembled in a state (magnetically) connected to the flange portion 14b).

  A convex magnetic pole part 59 made of the same kind of magnetic material as that of the housing 55 (for example, iron) protrudes from the center of the lower surface of the ceiling part 55a of the housing 55.

  The convex magnetic pole part 59 is formed from the upper side larger than the outer diameter of the plunger 58 and the inner diameter of the cylindrical body part 52a of the coil bobbin 52 and is in close contact with the ceiling part 55a (the center of the lower surface thereof) of the housing 55. In this state, the thick disc-shaped fixing portion 59a is fixed by welding or the like, and the plunger 58 is formed with a smaller diameter than the outer diameter of the plunger 58 (in the upper large-diameter insertion hole 58a) (from the upper side). ) It is formed with a step with a substantially cylindrical inner fitting portion 59b to be fitted. Here, the length (in the vertical direction) of the inner fitting portion 59b is set slightly longer than the depth (in the vertical direction) of the upper large-diameter insertion hole 58a of the plunger 58 into which the inner fitting portion 59b is inserted.

  Further, a space (specifically, the mold cover 54) surrounded (defined) by the ceiling 55 a of the housing 55, the upper part of the mold cover 54, and the fixing part 59 a (the outer periphery thereof) of the convex magnetic pole part 59. The annular groove 54a provided on the surface of the convex magnetic pole part 59 facing the fixed part 59a (the outer peripheral part thereof), and the lower part inner periphery (provided on the ceiling part 14a of the lid member 14 and the mold cover 54). O-rings 61 and 62 (first seal member 61 and second seal member 62) serving as seal members are respectively defined in the spaces surrounded by (defined) the annular groove 54b) and the stepped portion 53d of the suction element 53. ) Is installed in a compressed state.

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

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

  The pilot valve body 40 has an upper small-diameter portion 41 inserted into the intermediate small-diameter insertion hole 58b of the plunger 58 from above, an upper end side inserted into the lower intermediate-diameter insertion hole 58c of the plunger 58, and a lower end side above the suction element 53. The intermediate body part 42 inserted through the small-diameter fitting hole 53a and the lower large-diameter part 43 inserted into the lower large-diameter fitting hole 53b of the suction element 53 are provided. The outer diameter of the lower large diameter portion 43 is slightly larger than the 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 intermediate diameter insertion hole 58c of the plunger 58), and, for example, a semicircular washer is provided in the outer peripheral groove 44. A ring-shaped spring receiver 45 having a configuration in which two are combined is fitted.

  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 suction element 53 (the upper small diameter fitting insertion hole 53a). The pilot valve body 40 is always upward (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 receiver 45 provided on the pilot valve body 40 (see FIG. A compression coil spring 46 urged 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 circumferential step formed between the upper small-diameter portion 41 and the intermediate body portion 42) is inserted into the plunger 58 (the intermediate small-diameter insertion hole 58b and the lower intermediate-diameter portion thereof). The plunger 58 is pressed against an inner peripheral step formed between the hole 58 c and connected to the plunger 58, and the plunger 58 is biased in a direction away from the suction element 53 (upward).

  Here, in the illustrated example, an inner circumferential step formed between the upper small-diameter insertion hole 53a and the lower large-diameter insertion hole 53b of the suction element 53, the intermediate body portion 42 of the pilot valve body 40, and the lower large portion. A stopper that regulates the upward movement of the pilot valve body 40 by the urging force of the compression coil spring 46 (in other words, determines the upper movement limit of the pilot valve body 40) by the outer circumferential step formed between the diameter portion 43 and the outer peripheral step. Although a mechanism is formed, it is natural that the stopper mechanism is not limited to the above configuration. For example, the convex magnetic pole portion 59 (the lower surface of the inner fitting portion 59b or the lower surface of the fixed portion 59a) and the plunger 58 (the upper large-diameter insertion hole 58a and the intermediate small-diameter insertion) provided in the housing 55 (the ceiling portion 55a). The stopper mechanism may be configured by an inner circumferential step surface formed between the hole 58b or the upper surface of the plunger 58).

  The spring receiver 45 provided on the pilot valve body 40 may be made of, for example, metal or resin. For example, the spring receiver 45 is made of a magnetic material to increase the suction force of the pilot valve body 40 toward the attractor 53 side. be able to. In this example, the spring receiver 45 is formed separately from the pilot valve body 40 (as a separate part). However, 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 attached to the upper outer periphery (annular groove provided in) of the lower large-diameter portion 43 of the pilot valve body 40. ing.

  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 made of a truncated cone surface is formed on the inner periphery of the lower end of the cylindrical portion 43a. The tip (outer end) portion of the tapered surface 43b is in contact with and separated from the pilot valve seat 39a formed in the main valve body 20 (the upper seal portion 24 of the diaphragm 21) to open and close the pilot passage 39. The pilot valve body portion 40a is configured to be used.

  In the illustrated example, the outlet 12 of the valve body 10, the main valve body 20 (the pilot passage 39), the coil bobbin 52 (the cylindrical body portion 52a thereof), the attractor 53, the plunger 58, the convex magnetic pole portion 59, and The pilot valve body 40 and the like are disposed 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 solenoid coil 51 via the attractor 53, the plunger 58, the housing 55, the lid member 14 and the like). The attractor 53 and the plunger 58 are excited by the magnetic field generated by the solenoid coil 51 (with a magnetic path formed on the outer peripheral side), and the plunger 58 is resisted against the biasing force of the compression coil spring 46 as shown in FIG. 4A. 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 with the pilot valve 39 in the pilot valve 39. The pilot passage 39 is closed by pressing (sitting) against the seat 39a. At the same time, since the pilot valve body 40 presses the main valve body 20 downward (in the valve closing direction) (against the elastic force (push-up force) of the diaphragm 21 of the main valve body 20), the outlet 12 is also closed. .

  Therefore, at this time, the high-pressure fluid introduced from the inlet 11 into the main valve chamber 17 is not led out to the outlet 12, but this high-pressure fluid is back-pressured 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 20 a of the main valve body 20 is strongly pressed against the main valve seat 12 a of the outlet 12.

  At this time, the lower end portion of the inner fitting portion 59b of the convex magnetic pole portion 59 provided on the housing 55 (the ceiling portion 55a) is located inside the plunger 58 (specifically, the upper portion of the upper large-diameter insertion hole 58a). Since it is fitted, a magnetic path is secured and the attractive force of the plunger 58 is maintained.

  On the other hand, when the energization to the solenoid coil 51 is turned off from the closed state, that is, when the solenoid coil 51 is not energized, the pilot valve body 40 is moved to the plunger by the urging force of the compression coil spring 46 as shown in FIG. 4B. 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 out (released) through the pilot passage 39 to the outlet 12, the pressure in the back pressure chamber 18 decreases, and the inlet 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 differential pressure generated between the pressure valve 18 and 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 ( 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 type electromagnetic valve 1 of the present embodiment, the ceiling portion of the plunger chamber 60 where the plunger 58 is disposed so as to be movable up and down extends around the outer periphery of the coil device 49 including the solenoid coil 51, the coil bobbin 52, and the mold cover 54. Since the surrounding yoke is closed by the integrally formed housing 55, a separate yoke surrounding the outer periphery of the coil device 49 is not necessary, and the number of sealing portions for hermetically sealing the plunger chamber 60 can be reduced. The number of parts and the product cost can be reduced while ensuring the sealing performance.

  Further, since the inner fitting portion 59b of the convex magnetic pole portion 59 provided in the housing 55 is fitted into the plunger 58 (upper large diameter insertion hole 58a), the volume of the magnetic pole increases and the plunger 58 is lowered. A magnetic path is secured at the position (position separated from the ceiling 55a of the housing 55) (in this example, the valve closing position), and the attraction force when the plunger 58 is lowered (when the valve is closed) is increased. The physique can be reduced in size and weight.

  Further, the step portion 53d formed at the lower portion of the suction element 53 is fitted and fixed in the fitting hole 14c of the lid member 14 for forming the storage chamber 16, and the step portion 53d, the lid member 14 and the coil device are fixed. Since the O-ring (seal member) 62 is mounted in the space defined by the mold cover 55 (the mold cover 55), the sealing performance is improved and the O-ring 62 itself can be downsized (smaller in diameter). .

  In the above-described embodiment, the convex magnetic pole portion 59 is provided separately from the housing 55, but the convex magnetic pole portion 59 is, for example, like the pilot solenoid valve 2 shown in FIGS. (The fixed portion 59a and the inner fitting portion 59b) may be formed integrally with the housing 55 (for example, formed by deforming the central portion of the ceiling portion 55a of the housing 55 into a convex shape by press molding or the like).

  Moreover, in the said embodiment, although the main valve body (diaphragm valve body) 20 which has the diaphragm 21 was employ | adopted, the main valve body of other types (for example, piston type etc.) can be applied as the said main valve body 20. There is no need to elaborate.

DESCRIPTION OF SYMBOLS 1 Pilot type solenoid valve 10 Valve body 10b Diaphragm receiving part 11 Inlet 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 Connection 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 Middle Body 43 Lower large-diameter portion 44 Outer groove 45 Spring receiver 46 Compression coil spring 47 Packing (piston ring)
49 Coil Device 50 Electromagnetic Actuator 51 Solenoid Coil 52 Coil Bobbin 53 Attractor 53d Stepped Part 54 Mold Cover 55 Housing 58 Plunger 59 Convex Magnetic Portion 59a Fixed Part 59b Inner Part 60 Plunger Chamber 61 O-ring (First Seal Member)
62 O-ring (second seal member)

Claims (9)

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 are disposed, and the main valve body and the back pressure chamber are arranged by the main valve body. And a pressure supply passage for supplying the main valve chamber or the inlet pressure to the back pressure chamber, and the main valve body supplies the pressure of the back pressure chamber to the outlet port. A pilot passage is provided for escaping to the outlet, and the pilot passage is opened and closed by a pilot valve body that is driven up and down by an electromagnetic actuator, so that the outlet is opened and closed by the main valve body in response to the pilot valve body. A pilot-type solenoid valve,
The electromagnetic actuator has a coil device in which a plunger, an attractor, and a coil bobbin around which a solenoid coil is wound are covered with a mold cover, and a hollow formed in the coil device. A magnetic material in which a wall surface facing the part is used as an inner wall surface of a plunger chamber in which the plunger is arranged to be movable up and down, and a ceiling part of the plunger chamber is integrally formed with a yoke surrounding the outer periphery of the coil device A pilot-type solenoid valve characterized in that a convex magnetic pole portion having an inner fitting portion that fits inside the plunger protrudes from the housing.   2. The pilot solenoid valve according to claim 1, wherein a part of the inner fitting portion is fitted into the plunger at a lowered position of the plunger.   The convex magnetic pole portion includes a fixed portion that is in close contact with the housing and is formed to have a diameter larger than the outer diameter of the plunger, and the inner fitting portion that is formed to have a smaller diameter than the outer diameter of the plunger. The pilot solenoid valve according to claim 1 or 2, characterized in that   4. The pilot solenoid valve according to claim 1, wherein the convex magnetic pole portion is provided separately or integrally with the housing. 5.   The pilot type solenoid valve according to any one of claims 1 to 4, wherein a first seal member is interposed between the coil device and the housing.   6. The pilot solenoid valve according to claim 5, wherein the first seal member is mounted in a space defined by the coil device, the housing, and the convex magnetic pole portion.   The suction element arranged to face the plunger is fitted and fixed in a fitting hole provided in a lid member for forming the storage chamber, and the housing is connected to the lid member. The pilot-type solenoid valve according to any one of claims 1 to 6, wherein the pilot-type solenoid valve is characterized in that:   A step portion formed on the suction element is fitted and fixed in the fitting hole of the lid member, and a space defined by the step portion of the suction element, the lid member, and the coil device The pilot type solenoid valve according to claim 7, wherein two seal members are mounted.   The pilot type solenoid valve according to claim 8, wherein the step portion of the suction element is fitted and fixed to the fitting hole of the lid member by press fitting.

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