JP3528465B2 - solenoid valve - Google Patents

Description

Description: BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to a solenoid valve for controlling a fluid, and more particularly to reducing the operating noise of the solenoid valve and improving the manufacturability and assembly of parts. It is effective to make it. 2. Description of the Related Art FIG. 3 shows an example of a conventional electromagnetic valve of this type. This conventional technique is based on the technique 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 a solenoid valve as a whole. A center post 102, which is substantially a magnetic material, a coil 103 surrounding the center post 102, and a valve seat 104 provided opposite to the center post 102 are provided. 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 reciprocally movable. The plunger 106 is a center post 1
02 and the spring 10 interposed between the plunger 106
7 is held so as to always press against the valve seat 104. The reference numeral 108 designates the plunger 106 as the valve chamber 1
This is a diaphragm-like holding packing for reciprocating without contacting or sliding contact of the 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 in an OFF state.
Is closed and the fluid to be controlled does not flow. FIG. 4 (b)
Is a state in which the solenoid valve 101 that has passed a current through the coil 103 is in an ON state, 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.
3 and the body 104a on the 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 stretched holding packing 108. A communication hole 108c is provided in the membrane portion of the holding packing 108 so as to make the pressure in the valve chamber 105a on the center post side equal to the pressure in the valve chamber 105b on the valve seat side. Reference numeral 109 denotes a seal rubber for improving the sealing property between the plunger 106 and the valve seat 104. The seal rubber 109 absorbs an impact when the plunger 106 collides with the center post 102 and the valve seat 104 when the plunger 106 reciprocates. The operation sound of the solenoid valve 101 is reduced. Accordingly, the abutting portions 109a, 1a protrude from both end surfaces of the plunger 106.
09b. In the solenoid valve 101 having such a configuration, since the holding gasket 108 for holding the plunger 106 is extended in accordance with the reciprocating motion of the plunger 106, the tension reduces the speed of the reciprocating motion of the plunger 106, and the collision of the plunger 106 is prevented. The sound has been reduced. However, in the solenoid valve 101 having the above-described structure, the film pressure of the film portion of the holding packing 108 for holding the plunger 106 varies, and the solenoid valve 101 is fixed by being sandwiched between the bobbin 103a and the body 104a. The tension of the membrane part fluctuates due to the state of being pressed (changes due to the crimping load or the crushing rate of the outer peripheral end 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 membrane pressure of the membrane 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. In order to achieve the above object, according to the present invention, there is provided a center post which is excited by a coil to become a magnetic material , and is disposed opposite to the center post.
A valve chamber having a valve seat that is disposed within the valve chamber, and a support member formed of an elastic material, depending on the support member
And a plunger inside is supported reciprocably in the valve chamber Te, along with biasing the plunger in one direction by a spring, against the biasing force of the spring
Te actuates the other direction by the magnetic force of the center post
In the solenoid valve for controlling the fluid by performing the reciprocating operation of the plunger, the support member moves the inside of the valve chamber into the valve chamber.
A diaphragm that divides into two in the reciprocating direction of the plunger.
Ri, in the valve chamber, the abutment portion is provided to said support member for movement with the reciprocating motion of the plunger abuts the supporting
A communication hole is formed at a position where the contact portion of the holding member contacts.
When the support member is in contact with the contact portion,
The communication hole is closed . According to this configuration, the support member, which moves with the reciprocating operation 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. The support member is a diaphragm that divides the inside of the valve chamber in the reciprocating direction of the plunger, and has a communication hole at a position where the abutting portion of the diaphragm 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 the biasing of the plunger due to the pressure response of the diaphragm is not performed. Further, when the communication hole is closed due to the movement of the plunger, the damper action by the fluid sealed in the valve chamber increases, so that the plunger which attempts to move further from the state where the diaphragm is in contact with the contact portion is increased. Reduces momentum. (Embodiment 1) A first embodiment of a solenoid valve 1 to which the present invention is applied will be described below with reference to FIG. Shown in 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-like 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 8 b 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 at 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 a contact portion 3b which comes into contact with the radial portion 8c of the holding packing 8 and restricts 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 forming the valve chamber 5a on the center post 2 side. Reference numeral 9 denotes a seal rubber for improving the sealing property between the plunger 6 and the valve seat 4, and simultaneously absorbs the impact when the plunger 6 reciprocates and collides with the center post 2 and the valve seat 4. 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 reducing the collision sound of the plunger 6, the plunger 6
During the reciprocating operation, the radial portion 8d of the holding packing 8 comes into contact with the contact portion 3b to reduce the reciprocating speed of the plunger 6. Therefore, 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, the reduction in 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 tension due to a variation in 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 during assembly 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 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 provided in the radial portion 8d of the holding packing 8 is for eliminating the pressure difference between the divided valve chambers 5a and 5b. The communication hole 8c is provided so as to close the communication hole 8c in a state where the position of the contact portion 3b is in contact with the radial portion 8d. Therefore, after the holding gasket 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 pass 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 optimum operating characteristics. As described above, the present invention has the above-described structure and operation. Since the support member comes into contact with the contact portion during the reciprocating operation of the plunger, the momentum of the plunger can be surely reduced. Which contributes to a reduction in the operating 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 diagram illustrating an 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. [Description of Signs] 1 solenoid valve 2 center post 3 coil 3a bobbin 3b contact portion 4 valve seat 4a body 5, 5a, 5b valve chamber 6 plunger 7 spring 8 holding packing (supporting member) 8a outer peripheral end 8b inner peripheral end Part 8c Communication hole 8d Radial part 9 Seal rubber

Continuation of the front page (56) References JP-A-4-327083 (JP, A) JP-A-10-89527 (JP, A) JP-A-63-150178 (JP, U) JP-A-58-114967 (JP) , U) Japanese Utility Model Application Hei 2-31974 (JP, U) Japanese Utility Model Application Hei 4-56985 (JP, U) Japanese Utility Model Application Hei 5-79155 (JP, U) Registered utility model 3019339 (JP, U) (58) Field (Int.Cl. ⁷ , DB name) F16K 31/06 305

Claims (1)

(57) [Claim 1] A center post which is excited by a coil to become a magnetic material , and a valve seat which is arranged to face the center post.
And the valve chamber having, arranged inside the valve chamber, and a support member formed of an elastic material, and a plunger which is supported inside of the valve chamber reciprocably by the support member, the plunger while urging one direction by a spring, against the urging force of the spring, said by the magnetic force of the center post is operated in the other direction, performs a reciprocating operation of the plunge <br/> catcher, control fluid The support member reciprocates the plunger inside the valve chamber.
A diaphragm bisecting the dynamic direction, the valve chamber, the abutment portion is provided to said support member for movement with the reciprocating motion of the plunger abuts, to the position where the abutting portion of the support member abuts Communication hole
And when the support member is in contact with the contact portion,
A solenoid valve having a closed through hole .