JPH1089527A - Solenoid valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce collision noise of a plunger by providing with an abutting part which abuts on a supporting member moved in association with operation of the plunger on a valve chamber, in a device formed in a such a constitution that the plunger is energized in one direction and operated in the other direction by magnetic force of a center post so as to control a fluid. SOLUTION: A solenoid valve 1 is provided with a center post 2, a coil 3 enclosing the center post 2, and a valve seat 4 arranged opposed to the center post 2, and a plunger 6 is fitted to a valve chamber 5 between the center post 2 and the valve seat 4. The plunger 6 is held so as to be brought into pressure contact with the valve seat 4 by a spring interposed between the center post 2 and the plunger 6. In this case, the plunger 6 is supported to the inside of the valve chamber 5 by a diaphragm shaped holding packing 8 as a supporting member, which is being capable of reciprocating motion. And an abutting part 3d is arranged in the valve chamber 5, which abuts on the holding packing 8 during operation of the plunger 6 and for restricting movement of its diameter direction part 8d.

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 a fluid, and is particularly effective for reducing the operation noise of the solenoid valve and for improving the manufacturability and assembly of parts.

[0002]

2. Description of the Related Art As a conventional solenoid valve of this type, for example, there is one as shown in FIG. This prior art is based on the technology described in Japanese Utility Model Application No. 2-88283 or Japanese Utility Model Application No. 4-28109.

[0003] In FIG. 3, reference numeral 101 denotes an entire solenoid valve. A center post 102, which is a substantially magnetic material, a coil 103 surrounding the center post 102, and a valve seat 104 provided to face the center post 102 are shown. The valve chamber 10 between the center post 102 and the valve seat 104 is provided.
5, a plunger 106 is provided so as to be able to reciprocate.

The plunger 106 is a center post 1
Spring 10 interposed between plunger 02 and plunger 106
7 is held so as to always press against the valve seat 104.

A plunger 106 is connected to the valve chamber 1.
This is a diaphragm-shaped holding packing for reciprocating without contacting or sliding contact of the contact member 05.

FIG. 4 is an enlarged view of the vicinity of the plunger 106, and FIG. 4A shows a state in which the solenoid valve 101 in which no current flows through the coil 103 is turned off.
Is closed and the fluid to be controlled does not flow. FIG. 4 (b)
Is a state when the solenoid valve 101 is turned on when a current flows through the coil 103. The valve seat 104 is open, and a fluid to be controlled flows.

The plunger 106 will be described with reference to FIG. The holding packing 108 is formed by stretching a thin annular rubber-like elastic material.
No. 3 bobbin 103a and body 104a on valve seat 104 side
The inner peripheral end 108b is formed integrally at a substantially central portion of the plunger 106 in the axial direction. Accordingly, the valve chamber 105 is divided into a valve chamber 105a on the center post side and a valve chamber 105b on the valve seat side by the extended holding packing 108.

In the membrane of the holding packing 108, a communication hole 108c is provided to make the pressure in the valve chamber 105a on the center post side equal to that in the valve chamber 105b on the valve seat side.

Reference numeral 109 denotes a seal rubber for improving the sealing performance between the plunger 106 and the valve seat 104. The seal rubber 109 absorbs an impact when the plunger 106 reciprocates and collides with the center post 102 and the valve seat 104. The operation sound of the solenoid valve 101 is reduced. Therefore, the abutting portions 109a, 1a protrude from both end surfaces of the plunger 106.
09b.

In the solenoid valve 101 having such a structure, the holding gasket 108 for holding the plunger 106 is extended in accordance with the reciprocating motion of the plunger 106. Therefore, the speed of the reciprocating motion of the plunger 106 is reduced by the tension, and the collision of the plunger 106 is prevented. The sound has been reduced.

[0011]

However, in the solenoid valve 101 having the above-described structure, a variation in the film pressure of the film portion of the holding packing 108 holding the plunger 106 and a state where the film is fixed between the bobbin 103a and the body 104a. The tension of the membrane portion fluctuates due to (caulking load and the crushing rate of the outer peripheral end portion 108a), and it has been difficult to stably reduce the reciprocating speed of the plunger 106.

Therefore, conventionally, it is necessary to strictly set the dimensional intersection of the film pressure of the film portion of the holding packing 108, and to accurately control the crimping load and the crushing rate at the time of assembling. This has led to a decrease in assemblability.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and has as its object to reduce the operating noise of an electromagnetic valve by stably reducing the reciprocating speed of a plunger. Another object of the present invention is to provide a solenoid valve capable of improving manufacturability and assemblability of parts.

[0014]

According to the present invention, there is provided a valve chamber having a center post and a valve seat which are excited by a coil to become a magnetic material, and a valve seat. And a plunger supported in a reciprocating manner inside the valve chamber via a support member formed of an elastic material. The plunger is biased in one direction and the center is In a solenoid valve that is operated in the other direction by the magnetic force of a post and controls fluid by reciprocating operation of a plunger, the valve chamber includes a contact portion that contacts the support member that moves with the reciprocating operation of the plunger.

According to this configuration, the support member, which moves with the reciprocation of the plunger, comes into contact with the contact portion, so that the momentum of the plunger is reduced and the collision noise is reduced.

It is preferable that the support member is a diaphragm that divides the inside of the valve chamber in the reciprocating direction of the plunger, and that the diaphragm has a communication hole at a position where the abutting portion abuts.

According to this, when the communication hole is not closed by the contact portion, the pressure difference between the divided valve chambers is eliminated, and no urging of the plunger due to the pressure response of the diaphragm is performed. Further, when the communication hole is closed due to the movement of the plunger, the damper effect of the fluid sealed in the valve chamber increases, so that the plunger that attempts to move further from the state where the diaphragm is in contact with the contact portion is increased. Reduces momentum.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION

(Embodiment 1) As a first embodiment of a solenoid valve 1 to which the present invention is applied, FIG. 1 is a cross-sectional view of a main part of a valve chamber showing the features thereof. FIG. 2 is a view for explaining the overall configuration of the solenoid valve 1.

First, the schematic structure of the solenoid valve 1 will be described with reference to FIG. The basic configuration of the solenoid valve 1 is the same as the configuration described with reference to FIG. That is, a center post 2 of a substantially magnetic material, a coil 3 surrounding the center post 2, and a valve seat 4 provided to face the center post 2
The plunger 6 is provided in the valve chamber 5 between the center post 2 and the valve seat 4 so as to be reciprocally movable.

The plunger 6 is held by a spring 7 interposed between the center post 2 and the plunger 6 so as to always press against the valve seat 4.

Next, the characteristic structure of the present invention will be described with reference to FIG.

A slight gap is provided between the plunger 6 and the valve chamber 5 so that the plunger 6 can reciprocate without contacting or slidingly contacting the valve chamber 5. The plunger 6 is reciprocally supported inside the valve chamber 5 by a diaphragm-shaped holding packing 8 as a support member.

The holding packing 8 is formed by stretching a thin annular rubber-like elastic material. The outer peripheral end 8a is sandwiched between the end of the bobbin 3a of the coil 3 and the end of the body 4a on the valve seat 4 side. The inner peripheral end 8b is formed integrally with the plunger 6 at a substantially central portion in the axial direction. The end of the bobbin 3a and the end of the body 4a are stretched so that a predetermined tension is generated in the radial portion 8d of the holding packing 8.

The valve chamber 5 is divided by a holding packing 8 into a valve chamber 5a on the center post 2 side and a valve chamber 5b on the valve seat 4 side. Reference numeral 8c denotes a communication hole for eliminating a pressure difference between the divided valve chambers 5a and 5b.

Further, the valve chamber 5 is provided with an abutting portion 3b which abuts on the radial portion 8c of the holding packing 8 to restrict the movement of the radial portion 8d during the reciprocating operation of the plunger 6. The contact portion 3b is formed by expanding a portion of the bobbin 3a that forms the valve chamber 5a on the center post 2 side.

Reference numeral 9 denotes a seal rubber for improving the sealing performance between the plunger 6 and the valve seat 4, which absorbs the impact when the plunger 6 reciprocates and collides with the center post 2 and the valve seat 4, and The operation sound of the solenoid valve 1 is reduced. Therefore, it has contact portions 9a and 9b functioning as shock absorbing portions so as to protrude from both end surfaces of the plunger 6.

In the solenoid valve 1 having such a configuration, the radial portion 8d of the holding packing 8 for holding the plunger 6 is extended in accordance with the reciprocating motion of the plunger 6, so that the tension reduces the speed of the reciprocating motion of the plunger 6. In addition to lowering the collision sound of the plunger 6, the plunger 6
During the reciprocating operation, the radial portion 8d of the holding packing 8 abuts against the contact portion 3b to reduce the reciprocating speed of the plunger 6.

Accordingly, in the prior art, the speed of the plunger 6 is reduced by the tension of the holding packing.
In the configuration of the present invention, a decrease in the speed due to the tension of the holding packing 8 is caused by the thickness of the radial portion of the holding packing and the fluctuation of the tension due to the variation of the crimping load during assembly. It is possible to reliably perform the two-step speed reduction in which the speed is reduced when the packing 8 does not contact the contact portion 3b and the speed is reduced when the holding packing 8 is in contact with the contact portion 3b. Become.

Then, even if the thickness of the radial portion 8d of the holding packing 8 and the variation in the crimping load at the time of assembling are present,
The second-stage speed reduction in a state where the holding packing 8 is in contact with the contact portion 3b is less affected by the reduction in speed, and the manufacturability and assemblability of parts can be improved.

(Embodiment 2) A second embodiment will be described by using a solenoid valve 1 having the same configuration as that of the first embodiment.
However, in the second embodiment, the holding packing 8 and the contact portion 3
A characteristic configuration is provided depending on the state of contact with b.

The communication hole 8c formed in the radial portion 8d of the holding packing 8 is for eliminating the pressure difference between the divided valve chamber 5a and the divided valve chamber 5b. The communication hole 8c is provided so as to close in a state where the position of the contact portion 3b is in contact with the radial portion 8d.

Therefore, after the holding packing 8 and the contact portion 3b come into contact with each other while the plunger 6 is moving upward in FIG. 1, the fluid inside the valve chamber 5a may be communicated through the communication hole 8c. Since it cannot be performed, it is compressed and the damper function works, so that the speed can be further reduced.

In the first and second embodiments, the contact portion is provided only on the valve chamber 5a on the center post 2 side, but may be provided on the valve chamber 5b on the valve seat 4 side. And it is also possible to provide for both.

Also, by appropriately setting the amount and position of the protrusion of the contact portion 3b in accordance with the required valve opening characteristics of the solenoid valve 1, it is possible to exhibit optimal operating characteristics.

[0035]

As described above, the present invention has the above-described structure and operation. During the reciprocating operation of the plunger, the support member comes into contact with the contact portion, so that the momentum of the plunger can be reliably reduced. It contributes to the reduction of the operation noise of the solenoid valve.

Further, since the influence of the thickness of the holding gasket and the variation of the crimping load at the time of assembling is small, it is not necessary to provide a component having high dimensional accuracy or high assembling accuracy.
The manufacturability and assemblability of parts are improved.

With the holding member as a diaphragm, the sealed valve chamber exerts a damper function, thereby reducing the momentum of the plunger and further suppressing the operation noise.

[Brief description of the drawings]

FIG. 1 is an explanatory sectional view of a main part of a solenoid valve to which the present invention is applied.

FIG. 2 is a view for explaining the overall configuration of a solenoid valve to which the present invention is applied.

FIG. 3 is a diagram illustrating the overall configuration of a conventional solenoid valve.

FIG. 4 is an explanatory sectional view of a main part of a conventional solenoid valve.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Solenoid valve 2 Center post 3 Coil 3a Bobbin 3b Contact part 4 Valve seat 4a Body 5, 5a, 5b Valve room 6 Plunger 7 Spring 8 Holding packing (support member) 8a Outer peripheral end 8b Inner peripheral end 8c Communication hole 8d Radial part 9 Seal rubber

Claims (2)

[Claims] 1. A valve chamber provided with a center post and a valve seat which are excited by a coil to become a magnetic material, and a valve seat, and a support member which is disposed inside the valve chamber and is formed of an elastic material. A plunger supported reciprocally in the valve chamber through the plunger. The plunger is urged in one direction and is operated in the other direction by the magnetic force of the center post to control the fluid by the reciprocating operation of the plunger. An electromagnetic valve, comprising: a contact portion that contacts the support member that moves with a reciprocating operation of a plunger in the valve chamber. 2. The device according to claim 1, wherein the support member is a diaphragm that divides the inside of the valve chamber in a reciprocating direction of the plunger, and has a communication hole at a position where the abutting portion of the diaphragm abuts. Solenoid valve according to the above.