JPH02502116A - Pilot valve cartridge assembly - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Pilot valve cartridge assembly Technical field of invention The present invention relates to solenoid operated pilot valves, and more particularly to improved carts thereof. Relating to a ridge assembly.

Background technique The assembly of a solenoid-operated pilot valve, such as a pneumatic valve, is closed at one end by a magnetic pole member. It consists of a twisted cylindrical housing, and the magnetic pole member connects the air inside the housing to the atmosphere. A fluid discharge passage for ventilating the air is formed therethrough. Inside the housing is a magnetic The plunger driven by attraction generates a magnetic field between the plunger and the magnetic pole member. When it is activated or released, it comes into contact with the magnetic pole member and separates from it. The open end of the cylindrical housing is provided with a screw-in can be connected to the pilot air stream. Bullets placed at both ends of the plunger The magnetic valve seat closes the hole in the valve body when the magnetic field is removed and also closes the exhaust passage in the magnetic pole member. (On the other hand, when a magnetic field is generated, the hole is opened and the exhaust passage is closed. ing. Generates a magnetic field in the air gap between the plunger and the magnetic pole member Therefore, the solenoid is wound around a cylindrical housing. Compression in the plunger A spring is wound that causes the plunger to disengage from the pole member and the plunger end to It acts in the direction of pressing the valve seat in the valve body into the hole in the valve body.

A compression spring is provided in the plunger with both ends in contact with elastic valve seats, and the valve seats are is pushed axially outward during the plunge, thereby completing one end of the commuting stroke during the plunge. The valve seat contacts the valve hole of the valve body at the other end of the commuting stroke during the plunge. Conventionally, the valve seat sufficiently blocks the exhaust passage of the magnetic pole member. ing. A compression spring is provided in this way, and elastic valve seats are installed at both ends of the plunger. By providing a However, at the same time, the pilot valve cartridge assembly The problem is that the price of the body has virtually no choice but to rise.

Summary of the invention The present inventor has provided a pair of elastic valve seats and a compression spring that pushes them axially outward. The need for a valve seat in the plunger is replaced by a single valve seat that passes through the plunger. A means to prevent unintentional relative axial movement between the valve seat and the plunger shall be provided. I discovered that it can be avoided by Also, the hole (orifice) that should be added is shaped. Traditionally, the end of the plunge must be carefully machined to achieve An easy way to form a hole during the plunge, which may avoid the need in technique. As a result of the construction according to the present invention, we have also found a way to reduce the cost of the pilot valve assembly. It is possible to substantially reduce the cost of manufacturing. In addition, as a result of the experiment, the present invention This construction variant has been found to be highly reliable and has a long service life.

Brief description of the drawing FIG. 1 shows a solenoid type pilot valve cartridge according to one embodiment of the present invention. FIG. 3 is a longitudinal cross-sectional view of the assembly. FIG. 2 is substantially as viewed from the line 2-2 in FIG. 1. FIG. FIG. 3 is a longitudinal partial sectional view showing a modification of the configuration of the present invention. be. 4 is an end view taken in the direction of arrow 4 in FIG. 3. FIG.

Overview of the preferred embodiment The solenoid type pilot valve cartridge assembly according to the embodiment of the present invention is A flange having a cylindrical housing 10 made of a metal material and with which a wrench is engaged 12, and an outer threaded portion 14 is formed near the open end. , formed on the valve body indicated by the symbol VB and whose outline shape is schematically shown by an imaginary line. The flange portion 12 is engaged with a female thread of a complementary shape and a wrench is engaged with the cover. By tightening the cartridge assembly, the cartridge assembly can be attached to the valve body. The installation is as expected.

The end of the housing opposite to the open end is closed by a magnetic pole member 16 made of ferromagnetic material. but this member has a hole extending through both ends thereof, i.e., at its inner end. The fluid passes through the pole end face 20 and communicates with a counterbore 22 at the outer end thereof. An escape or exhaust passage 18 is provided. The counterbore 22 is indicated by the reference numeral 23. form the threads so that the air is exhausted from the cartridge assembly as described below. To facilitate the connection of the discharge or exhaust passage 18 to a piping system (not shown) for sending I can do that.

A shading coil 24 is provided on the end face 20 of the magnetic pole member, and the contact with this end face during plunge is prevented. Make sure that the contact is quiet or calm. O- placed in the circumferential groove of the magnetic pole member A ring seal 26 seals the pole member within the cylindrical housing 10. It has the function of Swaging around the housing as shown at 28 The machined part is engaged with the complementary shaped part formed around the magnetic pole member, and the magnetic pole part The outer end of the pole member that locks the material into the cylindrical housing is marked with a symbol. 30, with an inwardly threaded Engage a nut retainer (not shown) to retain the solenoid (not shown) You can do it like this. The solenoid slides into a cylindrical housing. One end is brought into contact with the flange, and the other end is secured with a nut stopper. Can be fixed to Uzing. When the solenoid is energized, the pole tip of the pole member A magnetic field is generated in the air gap AG between the surface 20 and the end surface of the plunger 32 on the opposite side. .

The plunger 32 is made of a ferromagnetic material and is provided in a cylindrical housing so as to be able to reciprocate. It is being This plunger is generally circular and has a long length that opens at each end. A hole is formed in the direction. In addition, a long and narrow hole (slot) 36 extending in the longitudinal direction is provided. , one end of which passes through the end face 38 of the plunger that engages the magnetic pole member. At the other end, the tapered portion 40 is passed through and opened. this slot 36 is the length of the plunger through the cylindrical housing when the solenoid is deenergized. Air is released from the end of the plunger through the exhaust passage 18 of the pole member. Give a stool to relieve your mind. The end of the transverse hole 35 opens into the slot 36 and the hole 34. , which allows equalization of the fluid pressure within the slot 36 and within the hole 34.

A transverse groove 42 with a V-shaped cross section is provided centrally in the hole 34 and also in the longitudinal slot 36. in communication so that the end face 38 in the plunge abuts the end face 20 of the pole member. To prevent the occurrence of "Jiro block" (mutual sticking) phenomenon that may occur when Ru.

When the solenoid is deenergized, it comes into contact with the (magnetic pole) end surface 20 of the magnetic pole member during the plunge. It moves from the position toward the hole (orifice) 44 in the pilot valve body. plunger This movement is provided around the taper portion 40 of the plunger and in the cylindrical housing. One end is brought into contact with and supported by the shoulder 48, and the other end acts on the plunger. This is done by the action of a conical compression spring 46 which is supported in abutment thereon. actual Above, this compression spring 46 has a T-shaped valve seat 54 having a shaft portion 56 at its small diameter end. It is brought into contact with a lip portion 50 formed by bending the head portion 52 inwardly. Head 52 is a cap It has a radial flange portion 58, and its end portion is It is a cylindrical part 60 extending in the axial direction, and the above-mentioned lip part 50 is provided at the free end of the cylindrical part 60. It is formed. As shown in FIG. As shown, axial grooves are formed in circumferentially spaced relationship. valve seat A shaft portion 56 is provided through the hole 34, and its end portion is connected to the end surface 38 of the plunger. The valve seat may be flush with the valve seat or protrude slightly from it. Means are provided to limit relative axial movement of plunger 32.

This means has a lip 50 of the valve seat formed in the circumferential radial direction at the end of the plunger. It is constructed by engaging the rear side of the flange portion 62. plunger hole 34 has a counterbore 64 having a shoulder 66 into which the head of the valve seat is attached. portion 52 to abut, thereby limiting axial inward movement of the valve seat. ing.

The valve seat is made of a rubber material such as carboxylated nitrile rubber with a durometer of about 60. It is made of soft material. Instead of carboxylated nitrile rubber, Viton (Vi An elongated shaft 56 which may be made of Buna-N rubber or Buna-N rubber. is slidably housed within the hole 34 of the plunger. As is clear from Figure 1 One end of this shaft has a hat-shaped head 52, while the other end is simply a plastic head. It only extends through the end face 38 of the plunger.

Preferably, the end face 57 of this shaft portion is flush with the end face 38 of the plunger. shaft If it is desired that the end of the valve protrude beyond the end face of the plunger, In relation to the durometer hardness of the elastic material that makes up the seat, the solenoid is energized to When a magnetic field is generated in the air gap AG between the lunge and the magnetic pole member, the valve seat fully contracts. The end face 20 of the magnetic pole member and the end face 38 of the plunger are brought into abutting engagement, and the shaft thereof is The projecting structure is such that the portion 56 can close the end of the exhaust passage 18. is necessary.

“Jaw blocking” phenomenon between the end face 57 of the valve seat shaft 56 and the end face 20 of the magnetic pole member 16 In order to prevent the occurrence of A hole (origin) is formed by connecting the peripheral edge of the end face 57 of the An annular groove 76 forming a fiss 78 is formed. This configuration allows the magnetic pole member to The edges are carefully machined and the delicately machined surface Conventional techniques require forming an enclosed axially projecting orifice. According to the structure of the present invention, which can be implemented at a significantly lower cost compared to the above, the annular groove 76 At the same time as forming a groove for accommodating the shaded coil 24, simple machining is performed. Then, the entire end face 20 is polished by a surface polishing machine. Finishing creates an orifice that is just as effective as prior art configurations. In addition, processing costs can be significantly reduced.

Since the valve seat has elasticity, its cap-shaped head is attached to the radial flange portion 6 of the plunger. 2, and the lip part 50 is engaged with the rear side of this flange part 62. This secures the valve seats in the plungers and prevents any interference between these plungers and the valve seats. It is possible to prevent relative axial movement of the sensor. Reinstall the compression spring as described above. The lip portion 50 is supported on the plunger 50, so that the lip portion 50 is surely supported by the plunger radiation. It is held in a state surrounding the shaped flange portion 62.

The valve seat may have a central recess 68 as shown in FIG. As in the modification of the embodiment of the invention shown in FIG. It can also be a flat surface.

A solenoid (coil) is installed around the cylindrical housing, and the pilot valve Operation of a pilot valve cartridge assembly according to the invention with threaded mounting Briefly, when the solenoid is energized, the plunger moves to the right in Figure 1. , and the shaft portion 56 of the valve seat closes the end of the exhaust passage 18 at the hole 78 of the magnetic pole member. This prevents air from escaping through the slot 36. The center recess 68 (or end) of the valve seat The surface 70) is separated from the pilot valve orifice 44, and the air The air flows from the hole 44 to another air passage 74 in the valve body which performs the operation of the valve.

When the solenoid is deenergized, the compression spring 46 immediately pushes the inside of the plunge from side to side. The central recess 68 (or end surface 70) closes the hole 44, and pressurization to the pilot valve is stopped. The air in this valve flows through the slot 36 and out of the exhaust passage 18 of the pole member. is discharged.

A valve seat is provided that extends completely through the plunger from one end to the other. The runger closes the exhaust passage of the pole member in one position, and in the other position. The solenoid-operated pilot is configured to close the pilot valve hole. The cost of manufacturing the cartridge assembly of the valve can be substantially reduced; The overall structure of the cartridge assembly could be simplified.

Since the transverse hole 35 is provided, the fluid pressure in the slot 36 and the hole 34 is equalized. This causes the valve seat to dislodge from the plunger in the axial direction, making it difficult to correct the plunger. This eliminates the risk of interference with other operations. For example, the pilot valve is 200 Especially when utilized at high fluid pressures such as p, s, i, or higher, the transverse hole 35 It is preferable to provide

By providing the axial groove 61, the head 52 and the inner circumferential surface 11 of the housing 10 are It is possible to easily escape the fluid pressure between the two.

international search report --I-II-I-IIIJI^Il-mme tube'mouth PCT/L; 587102 947

Claims (10)

[Claims] 1. Cylindrical housing with one end closed by a magnetic pole member and magnetic attraction. It has a movable plunger inside the housing, and the magnetic pole member has a movable plunger inside the housing. An inwardly opening fluid passageway is formed to transmit a magnetic field between the plunger and the magnetic pole member. The movement and movement of the plunger in contact with the magnetic pole member when it is generated and when it is released. The plunger has a corresponding A solenoid operated pipe with a longitudinal hole that opens at both ends. A cartridge assembly for a rot valve, wherein the hole extends from one end of the hole to the other end. and an elastic material that closes the fluid passage when the plunger abuts the magnetic pole member at one end. A valve seat made of aluminum is provided, and when the plunger moves away from the magnetic pole member, the valve seat The other end of the plunger is exposed so as to close the hole that is intended for use in the cartridge assembly. The valve seat is held in the plunger, and the valve seat and the plunger are A pilot valve car characterized in that it is provided with means for restricting the relative movement of the pilot valve. Torridge assembly. 2. A means for holding the valve seat is provided near the other end of the plunger. A cartridge assembly for a pilot valve according to item 1. 3. The means for retaining the valve seat comprises an interfitting portion of the valve seat and the plunger. A pilot valve cartridge assembly according to claim 1. 4. A radial flange portion is provided at the other end of the plunger, and a radial flange portion is provided on the valve seat. Claim 1, further comprising a portion that fits into the rear side of the flange portion in the radial direction. Cartridge assembly for the pilot valve described in Section 1. 5. The other end of the plunger has a circumferential flange extending radially outward. The corresponding end of the valve seat has a circumferential flange extending radially outward; The flange part of the valve seat has a circumferential lip with a diameter smaller than that of the flange part of the plunger. The flange and lip of the valve seat are expandable in the radial direction. It is attached around the flange of the plunger by a gripping engagement, and the valve seat is in a planar position. A cartridge assembly of a pilot valve according to claim 1 held in a cartridge. body. 6. The pyrotron according to claim 1, wherein the valve seat protrudes outside both ends of the plunger. Cartridge assembly for cut valve. 7. A magnetic pole member is provided on its end face facing the plunger, concentric with said fluid passageway and having a resilient By connecting the peripheral edge of the valve seat made of wood, the plunger approaches and leaves the magnetic pole member. Claim 1 having an annular groove forming a hole that is opened and closed by the valve seat during operation. Cartridge assembly for the pilot valve described in Section 1. 8. Plunger for solenoid operated pilot valve cartridge assembly. is an elongated, cylindrical cylinder with a hole extending axially from one end to the other. a member having a shape that is movable by magnetic attraction; It consists of a valve seat made of an elastic material, and these valve seats and a cylindrical member move relative to each other in the axial direction. A plunger having radially interdigitated portions for restricting. 9. The valve seat has a radial flange with a circumferential lip at the end. This flange is expandable and extends around the radial flange of the plunger. Claims that the cover, valve seat and plunger are held to prevent unexpected relative movement. A plunger according to scope item 8. 10. The radial flange portion has the circumferential lip portion at an end. It has a cylindrical part extending in the axial direction, and the outer surface of this cylindrical part has a cylindrical part extending in the radial direction. A groove extending in the axial direction is formed to facilitate fluid flow around the flange. A plunger according to claim 9.