JPH0557563U - solenoid valve - Google Patents

Abstract

(57) [Summary] [Purpose] To improve quietness when the solenoid valve operates. [Structure] A small diameter portion 11c is provided at the end of the solenoid core 11.
And project the plunger 13 onto the upper end of the plunger 13.
A recess 14 is provided that loosely fits in the small diameter portion 11a when moving.
The recess 14 has a small-diameter portion 11 as the plunger 13 moves.
A stopper 18 formed of fluororubber 17 is provided so as to come into contact with the tip of a. Further, a cylindrical interference portion 22 integrally formed with the stopper 18 is provided on the inner wall 21 of the recess 14 to avoid direct contact and contact between the plunger 13 and the small diameter portion 11a. Moreover, the core 11 and the plunger 13
The surface areas of the parts facing each other are increased, and the suction force of the plunger 13 in the solenoid is increased.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to a solenoid valve with improved quietness during operation.

[0002]

[Prior Art]

 Conventionally, there is a solenoid valve shown in FIG. 5, for example. The solenoid valve 41 has a resin main body 42 and a solenoid 43 located at one end of the main body 42. The main body 42 is formed with a first port 44 and a second port 45, and a communication hole 46 that communicates with both of the ports 44, 45. Further, in the main body 42, a yoke 55 is embedded in the outer peripheral portion of the communication hole 46. Has been done. A sheet 47 is formed on the other end of the communication hole 46. Further, the solenoid 43 is integrally formed with the main body 42 and forms the one end side of the communication hole 46, the coil 49 externally fitted to the bobbin 48, and is inserted inside the one end side of the bobbin 48. The core 50 is a fixed iron core.

On the other hand, a plunger 51, which is a valve body, is slidably fitted in the communication hole 46, and a stopper 52 made of a non-magnetic member is press-fitted to one end of the plunger 51. The stopper 52 has a projecting portion 53 whose tip extends toward the core 50 side from one end surface of the plunger 51. A spring 54, which is contracted between the core 50 and the plunger 51, is externally fitted to the projecting portion 53, and the spring 51 urges the plunger 51 toward the other end. At the other end of the plunger 51, a rubber valve 56 that comes into contact with the seat 47 and shuts off the connection between the first port 44 and the second port 45 is provided.

In the solenoid valve 41, the plunger 51 is reciprocally operated by the attraction force of the solenoid 43 and the elasticity of the spring 54, and the valve 56 is brought into contact with and separated from the seat 47 accordingly. The fluid flow path therein is opened and closed. Further, during such operation, the stroke of the plunger 51 is restricted by the stopper 52 contacting the core 50, and the valve 56 is made of rubber, so that the valve 56 is closed when the plunger 51 is closed. The hitting sound when the sheet abuts against the seat 47 is prevented.

[0005]

[Problems to be solved by the device]

 However, in such a conventional solenoid valve 41, although the operating noise when the plunger 51 is closed is reduced, when the solenoid 43 is excited, the stopper 52 of the plunger 51 causes the stopper 52 of the core 51 to move. A hitting sound was generated by contacting with, and the quietness of the solenoid valve was hindered by such hitting sound.

The present invention has been made in view of the above conventional problems, and an object thereof is to provide a solenoid valve having improved quietness during operation.

[0007]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, in the present invention, the valve body slidably fitted in the main body and urged in one direction is attracted and moved in the other direction by the electromagnetic force of the solenoid. In a solenoid valve that opens and closes a fluid path by reciprocating movement of the body, a convex portion is provided on the fixed iron core of the solenoid with which the end of the valve body abuts when the valve body operates, while the valve is provided at the end of the valve body. A concave portion is provided that loosely fits the convex portion when the body moves in the other direction, and a position regulating portion that comes into contact with the tip of the convex portion as the valve body moves in the other direction is provided in the concave portion. The position restricting portion is formed of an elastic member. Further, it is preferable that an interference portion surrounding the convex portion is provided in the concave portion and the interference portion is formed by an elastic member.

[0008]

[Action]

 In the above configuration, when the solenoid is excited and the valve body is sucked and moved in the other direction, the tip of the convex portion provided on the fixed iron core comes into contact with the position regulating portion provided in the concave portion of the valve element, and the valve Movement of the body in the other direction is restricted. At this time, since the position restricting portion is formed by the elastic member, generation of a hitting sound due to contact between the fixed iron core and the valve body is prevented. Moreover, since the convex portion is provided at the end of the fixed iron core and the concave portion is provided at the end of the valve so as to be loosely fitted in the convex portion when moving in the other direction, both the fixed iron core and the valve body are provided. Since the surface areas of the opposing portions of are large, the attraction force acting on the valve body when the solenoid is excited can be made relatively large.

In addition, when the valve body or the recess has a defective molding, or when the valve body is vibrated due to an external factor or the like, the inner wall of the recess may come close to the protrusion when the valve body operates. At this time, if the interference portion surrounding the convex portion is provided in the concave portion and the interference portion is formed by the elastic member, the interference portion comes into contact with the convex portion so that the inner wall of the concave portion and the convex portion are separated from each other. Contact can be avoided, and contact noise between the interference portion and the convex portion is not generated.

[0010]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. 1 shows a solenoid valve 1 according to a first embodiment of the present invention. The solenoid valve 1 has a resin main body 2 and a position on one end side of the main body 2 similar to the one shown in FIG. And a solenoid 3 that operates. The main body 2 is formed with a first port 4 and a second port 5, and a communication hole 6 that connects the ports 4 and 5 to each other. In the main body 2, a yoke 7 is embedded in the outer peripheral portion of the communication hole 6. ing. A sheet 8 is formed on the other end side of the communication hole 6. On the other hand, the solenoid 3 is integrally molded with the main body 2 and forms the one end side of the communication hole 6, the coil 10 externally fitted to the bobbin 9, and the one end side of the bobbin 9 which is inserted and communicated. The core 11 is a fixed iron core that closes one end of the hole 6. The core 11 has a substantially T-shaped cross section, and has a large-diameter portion 11a fitted in the communication hole 6 and a medium-diameter portion 11b having a diameter slightly smaller than the inner diameter of the communication hole 6, and the medium-diameter portion 11b. A small-diameter portion 11c, which is a small-diameter convex portion, is further projectingly formed at the end of the.

A plunger 13 which is a valve body formed of a magnetic material is slidably fitted in the communication hole 6. At one end of the plunger 13 on the core 11 side (see FIG. 2), a retainer portion 13a having substantially the same outer dimensions as the medium-diameter portion 11b of the core 11 is formed, and a central portion of one end surface of the retainer portion 13a. A recess 14 is provided in the. The plunger 13 is urged toward the other end by the retainer portion 13a and the spring 15 fitted onto the medium diameter portion 11b of the core 11. In addition, a hole penetrates from the recess 14 to the other end of the plunger 13 at the axial center of the plunger 13, and the fluororubber 17 baked on the plunger 13 is filled in the hole. Further, the filled fluororubber 17 forms a stopper portion 18 as a position regulating portion in the recess 14 at a position slightly retracted inward from the opening edge, and the other end of the plunger 13 is provided with the seat. 8 is formed, and in the state of FIG. 1, the valve body 19 closes the fluid path between the first port 4 and the second port 5.

In such a configuration, when the solenoid 3 is excited and the plunger 13 is attracted by the electromagnetic force of the solenoid 3 and moves to the core 11 side, the plunger 13 has a stopper portion 18 provided in the recess 14 and a small diameter of the core 11. The movement is restricted by the contact of the tip of the portion 11c. Along with this, the valve body 19 is separated from the seat 8 by the movement amount of the plunger 13, and the fluid passage is opened. At this time, since the stopper portion 18 of the plunger 13 is formed of the fluororubber 17 as described above, the striking sound is unlikely to be generated when the stopper portion 18 and the small diameter portion 11c of the core 11 come into contact with each other. Even when the solenoid 3 is de-energized and the plunger 13 is returned to the state shown in FIG. 1 by the elastic force of the spring 15, the hitting sound described in the conventional example is prevented.

Therefore, not only the striking sound between the valve body 19 and the seat 8 but also the striking sound when the plunger 13 is sucked and moved by the solenoid 3 is prevented. It is possible to improve the quietness in. Moreover, since the small-diameter portion 11c is provided at the end of the core 11 and the recess 14 is provided at the end of the plunger 13 that faces the core 11, the portions where the core 11 and the plunger 13 face each other. Has a large surface area, and the attraction force to the plunger 13 due to the excitation of the solenoid 3 is relatively large. Therefore, compared with the solenoid valve 41 shown in the conventional example, the stroke of the plunger 13, that is, the distance between the valve body 19 and the seat 8 when the valve is opened can be increased, and a larger control flow rate can be secured. Becomes

In the first embodiment described above, in order to reduce the manufacturing cost, the stopper portion 18 provided in the recess 14 of the plunger 13 and the valve body 19 of the plunger 13 are integrally formed. Although shown, the hole penetrating the plunger 13 may be eliminated and the stopper 18 and the valve body 19 may be molded separately.

On the other hand, FIG. 3 is a view corresponding to FIG. 2 showing a second embodiment of the present invention. In this embodiment, the strike is formed on the entire inner wall 21 of the recess 14 formed in the plunger 13. The fluororubber 17 forming the lid portion 18 is baked. A cylindrical interference portion 22 that surrounds the small-diameter portion 11 a of the core 11 and is continuous with the stopper portion 18 is formed in the recess 14 by the fluorine rubber 17.

In such a structure, when the plunger 13 is vibrated due to external factors or the like, or the plunger 13 that moves due to defective molding of the plunger 13 or the recess 14 is eccentric when the plunger 13 is operating. The recess 14 is displaced in a direction perpendicular to the moving direction of the plunger 13. In this case, as shown in FIG. 4, the small-diameter portion 11c of the core 11 comes into contact with the interference portion 22 to prevent contact with the inner wall 21 of the recess 14. Further, at this time, since the interference portion 22 is formed of the fluororubber 17, the contact noise is hard to be generated. Therefore, the contact noise between the concave portion 14 and the small diameter portion 11c is prevented in advance, and the quietness of the solenoid valve can be further improved.

In the present embodiment, the case where the interference portion 22 is continuously formed into a cylindrical shape with the stopper portion 18 and covers the entire area of the inner wall 21 of the concave portion 14 is shown, but the present invention is not limited to this. The interference portion 22 may be formed discontinuously with the stopper portion 18. Alternatively, the interference portion 22 may be divided into a plurality of interference portions, and the core 11 may be loosely fitted into the recess 14 by the divided and formed interference portions. You may make it enclose the small diameter part 11c.

[0018]

[Effect of the device]

 As described above, according to the present invention, the fixed iron core of the solenoid is provided with the convex portion, and the valve body is provided with the concave portion which is loosely fitted to the convex portion, and when the valve body is suction-moved by the solenoid, the tip of the convex portion is provided. Since the position regulating part made of an elastic member that abuts against the recess is provided in the recess, it is possible to prevent the impact sound from being generated when the fixed iron core and the valve body come into contact with each other, and the quietness when the solenoid valve is operated It is possible to improve. Moreover, since the surface areas of the opposing portions of both the fixed iron core and the valve body are large, the suction force acting on the valve body when the solenoid is excited can be made relatively large. Therefore, the stroke of the valve body can be made relatively large, and as a result, a relatively large control flow rate can be secured.

Further, since the interference portion surrounding the convex portion of the fixed iron core is provided in the concave portion of the valve element and the interference portion is formed by the elastic member, the valve element is actuated by an external factor during the operation of the valve element. Even when the body vibrates, or when the valve body or the recess has a defective molding, the protrusion contacts the interference portion to prevent contact with the inner wall of the recess. However, since the interference portion is formed of the elastic member, no contact noise is generated in such a case. Therefore, it is possible to prevent not only the impact sound between the valve element and the fixed iron core when the valve element is operating, but also the contact noise between them, which further improves the quietness when the solenoid valve is operating. It becomes possible.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing a first embodiment of the present invention.

FIG. 2 is an enlarged view of a main part of FIG.

FIG. 3 is a longitudinal sectional view corresponding to FIG. 2 showing a second embodiment of the present invention.

FIG. 4 is an explanatory view corresponding to FIG. 3 showing a contact state between the small diameter portion of the core and the inner wall of the recess in the same embodiment.

FIG. 5 is a vertical sectional view showing a conventional example.

[Explanation of symbols]

 1 Solenoid Valve 2 Main Body 3 Solenoid 11 Core (Fixed Iron Core) 11c Small Diameter Part (Convex) 13 Plunger (Valve) 14 Recess 18 Stopper (Position Control) 21 Inner Wall 22 Interference

Claims (2)

[Scope of utility model registration request] 1. A valve body, which is slidably fitted in the body and is urged in one direction, is attracted and moved in the other direction by an electromagnetic force of a solenoid, and the fluid path is opened and closed by the reciprocating operation of the valve body. In the electromagnetic valve, when a convex portion is provided on the fixed iron core of the solenoid with which the end portion of the valve element comes into contact when the valve element operates, the end portion of the valve element moves when the valve element moves in the other direction. A concave portion that is loosely fitted to the convex portion is provided, and a position regulating portion that comes into contact with the tip of the convex portion as the valve body moves in the other direction is provided in the concave portion, and the position regulating portion is formed of an elastic member. Solenoid valve characterized by that. 2. The solenoid valve according to claim 1, wherein an interference portion surrounding the convex portion is provided in the concave portion, and the interference portion is formed by an elastic member.