JP2553343Y2 - Solenoid valve - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solenoid valve for controlling the opening and closing of various fluid passages, and more particularly to a solenoid valve capable of extending its operation durability.

[0002]

2. Description of the Related Art Conventionally, as a solenoid valve for controlling the opening and closing of various fluid passages such as a hydraulic circuit and a pneumatic circuit, an on / off valve in which a plunger simply opens and closes in response to a control signal has been generally used. By the way, in a solenoid valve used for a hydraulic circuit or a pneumatic circuit of a vehicle engine, a plunger is turned on / off in a short cycle in response to a control signal.
The so-called constant cycle operation valve which repeats the OFF operation tends to be frequently used.

Here, the operation durability life required for the constant cycle operation valve is from 500 to 1 billion times in terms of the number of times the plunger is turned on and off, and the durability and sealing property of the sealing portion between the plunger and the valve seat. It was desired to improve. Therefore, conventionally, as shown in FIG. 7, rubber 23 as an elastic valve body is fixed to the plunger 22 of the solenoid valve 21 by baking, and this rubber 23 is attached to the valve seat 2.
By pressing against the sheet surface 24a of No. 4, the durability and sealing property of the seal portion are improved.

[0004]

In the prior art shown in FIG. 7, the rubber 23 serving as the elastic valve body simply comes into surface contact with the seat surface 24a of the valve seat 24 and presses the same. The impact is large. For this reason, when the number of times of operation of the plunger 22 increases, there is a problem that the rubber 23 is set or worn, and the sealing property of the seal portion is reduced, so that a sufficient operation durability life cannot be obtained. In this case, the material of the rubber 23 itself is changed to a material having high wear resistance,
By applying Teflon coating to the rubber 23, the operating durability life can be extended, but there is a limit.

[0005] Therefore, the valve body of the plunger is a valve seat.
To reduce the impact of the projection when abutting against
Improves the sealing ability of convex parts when joining with the sheet surface
It is to be. In addition, the operation durability life of the valve element is improved.
It is in.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned object, and the technical means is constituted as follows. That is, claim 1
Is the valve seat by the reciprocating movement of the plunger (4).
A solenoid valve (1) for opening and closing a fluid passage (8) provided in (3), wherein a seat is provided on an opening side of the fluid passage (8).
Valve seat (3) having surface (3a) and seat surface
A rubber-like elastic material facing the fluid passage (8) of (3a)
A plunger (4) having a valve body (7);
(7) is formed to have a diameter larger than the inner diameter of the fluid passage (8).
Beet-shaped protrusions formed at least in two lines
(7a, 7b) and of the projections (7a, 7b)
The outer convex portion (7a) is more protruding than the inner convex portion (7a).
The protrusion height is formed high. Further, according to claim 2, a plunger (4) the solenoid valve (1) for opening and closing a fluid passage (8) having the valve seat (3) by the reciprocating movement of the sheet on the opening side of the fluid passage (8)
Valve seat (3) having surface (3a) and seat surface
A rubber-like elastic material facing the fluid passage (8) of (3a)
A plunger (4) having a valve body (7) is provided, and a seat surface is provided.
Has a diameter larger than the inner diameter of the fluid passage (8).
Both the protrusions (7a, 7b) formed at least in two lines
And the outermost convex portion (7a, 7b) of the convex portions (7a, 7b).
a) is formed to have a higher protruding height than the convex portion (7a) on the inner peripheral side.
Is what is being done.

Further, each of the bead-shaped convex portions is formed on the seat surface instead of the elastic valve body.

[0008]

By adopting such means, in the solenoid valve according to the present invention, the fluid passage is closed by the plurality of bead-shaped protrusions formed on the elastic valve body of the plunger being pressed against the seat surface of the valve seat. . At this time, a damper chamber filled with the fluid in the fluid passage is formed between the bead-shaped convex portions having a step in the protruding height so as to leak from a gap formed by the step. Thus, by the damper action of the damper chamber, the impact force acting on the plurality of bead-shaped protrusions is sufficiently reduced, and the amount of elastic deformation of the bead-shaped protrusions is reduced. For this reason, settling and abrasion of the plurality of bead-shaped protrusions are reduced, the sealing performance and durability of the seal portion are improved, and the operating durability life of the solenoid valve is extended.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention shown in the drawings will be described below. 1 to 3 show a solenoid valve 1 according to a first embodiment of the present invention. In FIG. 1, reference numeral 2 denotes a closed cylindrical valve body having a valve seat 3 at one end. A plunger 4 is provided in the valve body 2.
The plunger 4 is urged toward the valve seat 3 by a set spring 5. A solenoid 6 is embedded in the valve body 2 so as to attract the plunger 4 to the opposite side of the valve seat 3 against the set spring 5.

A rubber valve body 7 facing the seat surface 3a of the valve seat 3 is fixed to the plunger 4 as a resilient valve body by means such as printing. And this rubber valve element 7
Are formed with two bead-shaped protrusions 7a and 7b to open and close a fluid passage 8 extending from a fluid inlet 2a formed in the valve body 2 to a fluid outlet 3b formed in the valve seat 3.

Here, the two bead-shaped protrusions 7a, 7
The reference character b denotes an annular shape surrounding the fluid outlet 3b of the valve seat 3, and the protrusion is provided with a step so that the outer bead-shaped protrusion 7a is higher than the inner bead-shaped protrusion 7b. The step is set to a predetermined value within a range in which both the bead-shaped protrusions 7a and 7b can be pressed against the seat surface 3a of the valve seat 3.

Next, the operation of the solenoid valve 1 of the first embodiment will be described. This solenoid valve 1 is controlled by a solenoid 6 by an appropriate control circuit (not shown).
Is controlled to energize, whereby the fluid passage 8 is opened and closed. That is, when the plunger 4 is attracted against the set spring 5 by the excitation of the solenoid 6, both the bead-shaped projections 7a and 7b of the rubber valve body 7 are separated from the seat surface 3a of the valve seat 3 and the fluid passage 8 is opened. Open and reverse solenoid 6
Is de-energized and the plunger 4 is urged toward the valve seat 3 by the set spring 5 to move, so that the bead-shaped projections 7a and 7b of the rubber valve body 7 are both pressed against the seat surface 3a of the valve seat 3. The fluid passage 8 is closed.

Here, the bead-shaped convex portion 7 of the rubber valve body 7 is used.
When the fluid passages 8 are closed by pressing the valve surfaces a and 7b against the seat surface 3a of the valve seat 3, only the outer bead-shaped protrusions 7a are pressed against the seat surface 3a of the valve seat 3 in the initial stage as shown in FIG. I do. Therefore, both bead-shaped protrusions 7a, 7b
Between them, a damper chamber 9 is formed that takes in the fluid in the fluid passage 8 and gradually leaks the fluid from the gap C due to the step between the two. By the damper action of the damper chamber 9, both bead-shaped protrusions 7a, 7b
Presses against the seat surface 3a of the valve seat 3 while closing the impact to close the fluid passage 8 (see FIG. 3). Also, in this closed state, the fluid is sealed in the damper chamber 9, so that
The amount of elastic deformation of both bead-shaped protrusions 7a and 7b also decreases.

As described above, the impact at the time of closing the valve is reduced, and the amount of elastic deformation is reduced.
As for a and 7b, settling and abrasion are reduced, the sealing performance and durability of the seal portion are improved, and the operating durability life of the solenoid valve 1 is extended.

FIGS. 4 to 6 show a solenoid valve 11 according to a second embodiment of the present invention.
Reference numeral 2 denotes a valve body configured substantially in the same manner as the valve body 2, and has a valve seat 13 at one end thereof. The plunger 1 is provided in the valve body 12.
The plunger 14 is biased toward the valve seat 13 by a set spring 15. Also, in order to suck the plunger 14 in the opposite direction to the valve seat 13 against the set spring 15,
A solenoid 16 is embedded in the valve body 12,
The above configuration is the same as that of the solenoid valve 1 of the first embodiment.

The plunger 14 has a valve seat 13.
The rubber valve body 17 facing the seat surface 13a of the above is fixed as a resilient valve body by means such as printing. Here, on a seat surface 13a of the valve seat 13, a fluid passage 8 from a fluid inlet 12a formed in the valve body 12 to a fluid outlet 13b formed in the valve seat 13 is opened and closed.
Two bead-shaped protrusions 13c and 13d are formed.

The two bead-shaped projections 13c, 13d
Is a ring that surrounds the fluid outlet 13b of the valve seat 13, and is provided with a step so that the protruding height is higher at the outer bead-shaped protrusion 13c than at the inner bead-shaped protrusion 13d. This step is formed by the two bead-shaped protrusions 13c, 1
The predetermined value is set within a range where the rubber valve body 17 can be pressed against 3d.

Next, the operation of the solenoid valve according to the second embodiment will be described. This solenoid valve 1
1, the fluid passage 18 is opened and closed by controlling the energization of the solenoid 16 by an appropriate control circuit (not shown), similarly to the solenoid valve 1 of the first embodiment. That is, when the plunger 14 is attracted against the set spring 15 by the excitation of the solenoid 16, the rubber valve body 17
Is separated from the bead-shaped protrusions 13c and 13d formed on the seat surface 13a of the valve seat 13, the fluid passage 18 is opened, and the solenoid 16 is de-energized, and the plunger 14 is moved toward the valve seat 13 by the set spring 15. When urged and moved, the rubber valve element 17 is moved to the bead-shaped projection 13 formed on the seat surface 13a of the valve seat 13.
The fluid passage 18 is closed by being pressed against c and 13d.

Here, the rubber valve element 17 is provided on a bead-shaped projection 13 formed on a seat surface 13a of the valve seat 13.
When the fluid passage 8 is closed by pressing against the c and 13d, only the outer bead-shaped convex portion 13c is in press contact with the rubber valve body 17 in the initial stage as shown in FIG. Therefore, both bead-shaped protrusions 1
Between 3c and 13d, there is formed a damper chamber 19 that takes in the fluid in the fluid passage 8 and gradually leaks the fluid from the gap C due to the step between the two.
Due to the damper function of the damper chamber 19, the rubber valve element 17 can reduce the impact while the bead-shaped convex portions 13c,
The fluid passage 18 is closed by pressing against 13d (see FIG. 6).
In this closed state, the fluid is sealed in the damper chamber 19, so that the local elastic deformation of the rubber valve body 17 is also reduced.

As described above, the impact at the time of closing the valve is alleviated, and the amount of local elastic deformation is also reduced, so that the rubber valve body 17 is reduced in settling and wear, and the sealing performance and durability of the sealing portion are improved. As a result, the operating durability life of the solenoid valve 11 is extended.

[0021]

[Effects of the Invention] The present invention provides a plunger valve body when the valve is closed.
The outer convex portion of the convex portion has a valve seat.
When fluid is joined to the surface, fluid is trapped on the inner peripheral side of the convex part on the outer peripheral side
It acts as a damper. For this reason, the convex part on the outer peripheral side
The impact force is alleviated and bonding can be performed. next,
The convex part on the inner peripheral side shorter than the outer peripheral side is joined to the seat surface,
When this inner peripheral side convex portion is also joined to the sheet surface, the outer peripheral side
The impact is mitigated by the damper function of the projection. But
Therefore, the protruding part of the valve body can extend the operation durability life
become.

Further , the convex portion on the outer peripheral side is larger than the convex portion on the inner peripheral side.
As the diameter is larger, the impact is reduced by the volume effect of the convex part
And at the same time, with the seat surface of the convex part on the inner peripheral side
Of the outer peripheral side that protrudes longer than the inner peripheral side
It is possible to exert the sealing effect by setting the optimum pressing force
become. Furthermore, the flow between the inner convex part and the outer convex part is different.
Due to the damper action of the body, the convex part on the inner peripheral side
Because it is supported by physical strength, the seal of the convex part on the inner circumference side
We can expect to show effect.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a first embodiment of a solenoid valve according to the present invention.

FIG. 2 is an enlarged sectional view of a main part showing the operation of the first embodiment.

FIG. 3 is an enlarged sectional view of a main part showing the operation of the first embodiment.

FIG. 4 is a sectional view showing a second embodiment of the solenoid valve according to the present invention;

FIG. 5 is an enlarged sectional view of a main part showing the operation of the second embodiment.

FIG. 6 is an enlarged sectional view of a main part showing the operation of the second embodiment.

FIG. 7 is a sectional view showing a conventional example of a solenoid valve.

[Explanation of symbols]

 1, 11, 21 ... Solenoid valve 2, 12 ... Valve body 2a, 12a ... Fluid inlet 3, 13, 24 ... Valve seat 3a, 13a, 24a ... Seat surface 3b, 13b ... Fluid outlet 4, 14, 22 plunger 5, 15 set spring 6, 16 solenoid 7, 17 rubber valve element 7a, 7b, 13c, 13d bead-shaped convex part 8, 18 fluid passage 9, 19 …… Damper room 23 …… Rubber

Continued on the front page (51) Int.Cl. ⁶ Identification code Agency reference number FI Technical display location F16K 1/42 F16K 1/42 B

Claims (2)

(57) [Scope of request for utility model registration] 1. A Bal by the reciprocating movement of the plunger (4)
A solenoid valve (1) for opening and closing a fluid passage (8) having a Bushito (3), opening of the fluid passage (8)
A valve seat (3) having a seat surface (3a) on the mouth side;
And a groove facing the fluid passage (8) on the seat surface (3a).
Plunger (4) having a valve body (7) made of rubber-like elastic material
The valve body (7) is provided with an inner diameter of the fluid passage (8).
Large diameter and at least two
Having a beat-shaped convex part (7a, 7b)
Outer convex portion (7a) of (7a, 7b) is inner peripheral side
The solenoid valve is formed to have a higher projecting height than the convex portion (7a) . 2. A plunger (4) solenoid valves for opening and closing a fluid passage (8) having the valve seat (3) by the reciprocating movement of (1), opening of the fluid passage (8)
A valve seat (3) having a seat surface (3a) on the mouth side;
And a groove facing the fluid passage (8) on the seat surface (3a).
Plunger (4) having a valve body (7) made of rubber-like elastic material
Provided on the seat surface from the inner diameter of the fluid passage (8).
It has a large diameter and at least two sections
Convex portions (7a, 7b) and the convex portions (7a, 7b).
The outer convex portion (7a) of the inner convex portion (7b)
A solenoid valve having a higher protruding height than a) .