JPS6113819Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a solenoid valve that controls the opening and closing of a valve seat by moving a valve body using electromagnetic force generated and eliminated in a solenoid.

Conventionally, in direct type solenoid valves that directly open and close the valve body using electromagnetic force generated and dissipated in the solenoid, when the fluid pressure becomes high or the valve seat diameter becomes large, a larger electromagnetic valve is required to overcome the force and open the valve. It required a coil, and there were limitations in terms of manufacturing and product cost.

For this reason, there is a pilot type that controls the opening and closing of the valve body using the fluid pressure flowing through the fluid flow path, but this structure allows a large flow path to be created with a small coil.
Although it was compact, its operation at low pressure and leakage performance were not sufficient. In addition, the technology to compact the coil so that the pressure of the fluid flowing through the fluid flow path does not affect the valve body operation is
For example, there are those shown in Japanese Utility Model Publication No. 45-2638, but these cannot be made compact because they require separate valves for fluid pressure cancellation on the other side of the valve body. be.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.A valve body 1 is divided into a fluid inflow path 3 and a fluid outflow path 4 by a valve seat 2 made of an elastic member provided inside. A valve support body 5 is provided protruding from the valve support body 5, and a ring body 7 having an O-ring 6 arranged around the outer periphery is provided at the upper end of the valve support body 5. A valve body 8 is disposed corresponding to the valve seat 2, and the valve body is slidably brought into contact with the annular body 7 of the valve support body 5 through a valve support hole 9 bored inside. A pressure chamber 10 is formed between the upper part of the ring body 7 and the valve support hole 9, and this pressure chamber 10 is connected to the fluid inflow path 3 through a pressure introduction path 11, and a strainer 12 is disposed in the pressure introduction path 11. Ru. Then, the diameter D of the valve support hole 9 of the valve body 8 and the valve diameter d of the valve body 8 are made equal. 13 is a solenoid surrounding the upper plunger portion 14 of the valve body 8, and 15 is a spring that presses the valve body 8 against the valve seat 2.

According to the above structure, when the solenoid 13 is de-energized and no magnetic force is generated in the solenoid 13, the valve body 8 is pressed against the valve seat 2 by the force of the spring 15 and is held closed. In such a valve closed state, the primary pressure in the fluid inflow path 3 acts on the entire outer periphery of the valve body 8 and inside the pressure chamber 10, and the valve body 8 exerts downward pressure equivalent to the outer diameter A of the valve body 8. It also receives an upward pressing force corresponding to the sum of the diameter D of the valve support hole 9 of the pressure chamber 10 and the outer diameter A of the valve body 8 - the valve diameter d, and this downward pressing force and upward pressing force In particular, the pressure is the same since the diameter D of the valve support hole 9 and the valve diameter d are made equal.

Therefore, no matter how the primary pressure in the fluid inflow path 3 changes, the valve body 8 is not affected by the primary pressure at all, so the valve body 8 can be operated reliably and the valve body 8 can be opened. The magnetic force of the solenoid 13 needs to be extremely small enough to simply overcome the spring 15, and the solenoid 13 is inexpensive, extremely compact, and easy to manufacture. In addition, since a pressure chamber connected to the fluid inflow path was formed by the upper part of the ring body and the valve support hole, the pressure chamber could be made compact in order to apply a biasing force in the opposite direction to the valve body. The valve itself can be made smaller, and the part of the valve body very close to the valve seat can be slid and held, which prevents the valve body from collapsing even when it receives fluid pressure, improving valve closing performance. can be maintained in good condition.

Furthermore, since the strainer 12 is arranged in the pressure introduction path 11 that connects the pressure chamber 10 and the fluid inflow path 3, foreign matter flowing through the fluid inflow path 3 does not flow into the pressure chamber 10, so that the operating characteristics of the valve body 8 are inhibited. This allows stable operating conditions to be obtained at all times.
Furthermore, since the end of the valve body 8 facing the valve seat 2 is obliquely cut, the flow in the valve seat 2 when the valve body 8 is opened is in a laminar flow state, and the flow state is turbulent. Therefore, stable flow characteristics can be obtained.

[Brief explanation of the drawing]

The figure is a longitudinal sectional view showing an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Valve body, 2... Valve seat, 3... Fluid inflow path, 4... Fluid outflow path, 5... Valve support body, 8...
Valve body, 9... Valve support hole.

Claims (1)

[Scope of utility model registration request] A valve body 1 is divided into a fluid inflow passage 3 and a fluid outflow passage 4 by a valve seat 2; the valve body 1 is integrally formed with the valve body 1, and the fluid inflow passage 3 is separated from the inside of the valve seat diameter of the valve seat 2;
The valve support 5 has a cylindrical shape and has a ring body 7 at its tip; the valve support hole 9 in the inner cylinder part is slidably fitted into the ring body 7 of the valve support body 5. a valve body 8 which is arranged and forms a pressure chamber 10 connected to the fluid inflow path 3 by the upper part of the ring body 7 and the valve support hole 9, and has a valve portion at the end opposite to the valve seat;
Solenoid 13 that operates the valve body 8 by magnetic force
and a pressure introduction path 11 that communicates the pressure chamber 10 and the fluid inflow path 3; the electromagnetic valve is formed by making the diameter D of the valve support hole 9 and the valve diameter d of the valve body 8 equal.