JPH0627895Y2 - solenoid valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a solenoid valve having a poppet type passage opening / closing valve body and particularly preventing clogging of a fluid passage.

[Conventional technology]

A conventional solenoid valve is shown in FIG. In this solenoid valve, a solenoid valve body d is screwed to a seat body c having an inlet passage a and an outlet passage b, and the force of a spring e closes the outlet passage b in the solenoid valve body d so that the force of an electromagnet is closed. With this, a poppet type passage opening / closing valve body f for opening the outlet passage b is provided to control passage and closing action of the fluid flow.

[Problems to be solved by the invention]

The fluid flow passing through the inlet passage a and the outlet passage b of the solenoid valve described above is generally filtered by the strainer in the process of flowing from the oil tank to the pressure source, and is also sent to the necessary control unit from the pressure source. Fine dust is filtered by the filter on the way, but shavings during machining of the molding sand of the control valve part that controls the fluid and the fluid passage of the control valve part, disassembly inspection and maintenance of the control valve part, Dust or the like adhering and entering during reassembly is blocked in the relatively small diameter passages of the inlet passage a and the outlet passage b before being caught by the strainer and the filter, or the passage opening / closing valve body f and the seat g. To stop the flow of the fluid or throttle the flow rate of the fluid, or to obstruct the closing action of the fluid flow so that the normal mechanical action of the control valve part due to the fluid flow cannot be obtained. There was.

[Purpose of device]

The present invention has been made in view of the above circumstances, and the object of the present invention is to provide a filter provided in the seat body.
An object of the present invention is to provide a solenoid valve which can prevent clogging of dust and can enhance the filter effect of this filter and also reduce the filter passage resistance exerted on the fluid flow.

[Means for solving problems]

In order to achieve the above object, the present invention is a solenoid valve having a seat body 2 provided with a plurality of inlet passages 13 around a circumferential surface around an outlet passage 9 in which the inlet passage 13 of the seat body 2 is provided. Each inlet passage 1 on the side of the entrance
An annular groove 12 having a width surface larger than the inlet diameter of 3 is formed, and the axial width of the annular groove 12 is made slightly wider than the thickness of the filter 24 so that the filter 24 can be moved in the axial direction. A ridge 14 for axially locking the filter 24 on at least one side of the inner and outer peripheral edges of the annular groove 12.
19 is formed.

Further, at least one side of the inner and outer peripheral edges of the annular filter 24, the protrusion 2 that engages with the annular groove 12 in the axial direction.
5, 26 are provided.

[Operation] The fluid flowing from the inlet passage 13 is filtered by the filter 24 to remove dust and the like in the fluid.

Further, the filter 24 moves in the axial direction by the flow of the fluid.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 6.

FIG. 1 shows a partially cross-sectional side view of an electromagnetic valve according to the present invention, in which 1 is an electromagnetic valve body and 2 is a seat body.
The base end portion of is seated on the seat 2.

The electromagnetic valve body 1 is provided with a bonnet 3, a core and a coil assembly (not shown) are provided in the bonnet 3, and a poppet type passage opening / closing valve body 4 reciprocates in the axial direction with respect to the core. The passage opening / closing valve body 4 is seated on the seat 6 by being biased by a spring 5.

The seat body 2 includes a seat body 7, and the seat body 7
A passage forming wall portion 8 and a screw portion 9'are formed in the passage forming wall portion 8. The seat 6 is formed in the center of the inner surface portion of the passage forming wall portion 8 and in the center of the passage forming wall portion 8. An outlet passage 9 is formed. On the outer surface of the passage forming wall portion 8, a circular annular large-diameter-side concave portion 10 is formed around the outlet passage 9.

An annular small-diameter-side recess 12 is formed in the bottom surface 11 of the large-diameter-side recess 10, and an inlet passage 13 is formed in the small-diameter-side recess 12 and extends from the bottom-surface portion 13 'to the inner surface of the passage forming wall 8. A plurality of them are formed at predetermined intervals in the circumferential direction.

An annular ridge 14 is formed on the inner peripheral surface of the small-diameter side recess 12, and the ridge 14 is formed by sandwiching a flat top 15 and forming inclined surfaces 16 and 17 on the left and right. An inner filter insertion groove 18 is formed by the inclined surface 17 and the bottom surface portion 13 ′ of the small diameter side recess 12.

An annular ridge 19 is formed on the outer peripheral surface of the small-diameter side recess 12, and the ridge 19 is formed by sandwiching a flat top 20 and forming inclined surfaces 21 and 22 on the left and right. An outer filter insertion groove 23 is formed by the inclined surface 22 and the bottom surface portion 13 ′ of the small diameter side recess 12.

The filter 24 is shown in FIG. The filter 24 is annular, and a plurality of protrusions 25 and 26 are formed on the outer peripheral portion of the filter 24 at predetermined intervals in the circumferential direction.
The inner protruding portion 25 has a protruding dimension that is smaller than the large diameter side and larger than the small diameter side of the inclined surface 17 of the inner filter insertion groove 18.

Further, the outer protruding portion 26 has a protruding dimension that is smaller than the large diameter side and larger than the small diameter side of the inclined surface 22 of the outer filter insertion groove 23.

The filter 24 is attached to the small-diameter side recess 12 by loosely fitting the inner protrusion 25 into the inner filter insertion groove 18 and the outer protrusion 26 into the outer filter insertion groove 23. .

The filter 24 is inserted into the inner and outer filter insertion grooves 18 and 23 so as to be movable toward the inlet passage 13 side, and also movable in the circumferential direction.

27 is an O-ring.

Next, the operation will be described.

By energizing the coil assembly of the electromagnetic valve body 1 to excite the core to attract the passage opening / closing valve body 4, the passage opening / closing valve body 4 is moved against the spring 5 and separated from the seat 6, and the inlet passage is opened. 13 and the outlet passage 9 are brought into communication with each other.

Then, the fluid is caused to flow through the inlet passage 13 to remove dust and the like in the fluid by the filter 24.

Fluid flow from outside the filter 24 to the inlet passage 13
When passing to the side, the filter 24 is pushed up,
The filter 24 has inner and outer filter insertion grooves 18, 2
Since the inclined surfaces 17 and 22 of No. 3 are moved toward the large diameter side thereof, the filter 24 is not twisted and adheres to the end surface of the inlet passage 13 to enhance the filter effect.

Further, the filter 24 can reciprocate toward the inlet passage 13 side depending on the level of the pressure of the fluid flow. Since this movement and the inclined surfaces 17 and 22 of the inner and outer filter insertion grooves 18 and 23 cause the filter 24 to move in the circumferential direction, that is, to perform a rotational movement, the same portion of the filter 24 is always in the same position as the inlet passage 1.
Since it does not face the end face of 3, the filter passage resistance exerted on the fluid flow is reduced.

The fluid is not limited to a liquid such as oil and may be a gas such as air.

[Effect of device]

Since the present invention is as described above, the fluid flowing from the inlet passage 13 is filtered by the filter 24 to remove dust and the like in the fluid.

Further, the filter 24 can reciprocate toward the inlet passage side 13 depending on the pressure of the fluid flow. This movement and the inner and outer filter insertion grooves 18 and 23 cause the filter 24 to move in the circumferential direction, that is, to perform a turning movement.
Since the same position does not always face the end surface of the inlet passage 13, the filter passage resistance exerted on the fluid flow can be reduced.

[Brief description of drawings]

FIG. 1 is a partially sectional side view of an embodiment of the present invention, FIG. 2 is an arrow view from the direction of FIG. 1 II, FIG. 3 is an enlarged view of part III of FIG. 1, and FIG. FIG. 5 is a vertical sectional view of the body, FIG. 5 is an enlarged view of a V portion in FIG. 4, FIG. 6 is a plan view of the filter, and FIG. 7 is a vertical sectional view of a conventional solenoid valve. 2 is a seat, 9 is an outlet passage, 12 is a concave portion, 13 is an inlet passage, 17 and 22 are inclined surfaces, 18 and 23 are filter insertion grooves, and 24 is a filter.

Claims (2)

[Scope of utility model registration request] 1. A solenoid valve having a seat body (2) provided with a plurality of inlet passages (13) around a circumferential surface around an outlet passage (9), wherein each inlet is provided on the inlet side surface of the inlet passage (13) of the seat body (2). An annular groove 12 having a width surface larger than the inlet diameter of the passage 13 is formed, and the axial width of the annular groove 12 is made slightly wider than the thickness of the filter 24 so that the filter 24 can move in the axial direction. , Annular groove 1
2. A solenoid valve having protrusions 14 and 19 for axially locking the filter 24 formed on at least one side of the inner and outer peripheral edges of 2. 2. A projection (25) which engages with the annular groove (12) in the axial direction is provided on at least one side of the inner and outer peripheral edges of the annular filter (24). Solenoid valve.