JPH0519656Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a solenoid valve used in industrial machines that utilize fluid pressure and vacuum pressure.

[Prior Art] Conventionally, as shown in, for example, Japanese Utility Model Application Publication No. 53-76323, an electromagnetic operating section, a return spring that opposes the operating force of the electromagnetic operating section, and a push rod and valve between these have been used. A solenoid valve is equipped with a body and transmits the operating force to the valve body via a push rod to change the direction of fluid flow.
Since the push rod is in direct contact with the overtravel spring and valve body of the movable iron core, the operating force of the electromagnetic operating section and the spring force of the return spring cause chattering each time the push rod is driven, and these contacts are caused. The contact surface wears out, and the wear causes a change in the amount of movement of the valve body, resulting in incomplete sealing of the fluid, and the biasing force of the overtravel spring acts unevenly on the valve body, causing the valve body to move. The life of the solenoid valve is shortened due to uneven wear and leakage of the valve body due to tilting, or failure of suction or sliding of the electromagnetic operating part due to abrasion powder, and failure of sliding of the valve body. There were flaws.

[Problem to be solved by the invention] The problem to be solved by the invention is to reduce the wear on the push rod contact surface and eliminate the inclination of the valve body by appropriately arranging the member having cushioning properties. The objective is to extend the life of the solenoid valve.

[Means for Solving the Problems] In order to solve the above problems, the present invention includes an electromagnetic operating section, a return spring that opposes the operating force of the electromagnetic operating section, and a push rod and a valve body between these. , in the electromagnetic valve that transmits the operating force to the valve body via the push rod to change the flow direction of the fluid, a spring receiving member is provided between the overtravel spring of the movable iron core in the electromagnetic operating section and the push rod; A pressing member for the valve body is provided between the valve body and the spring receiving member and the pressing member are made of synthetic resin to provide cushioning properties.

[Operation] A movable core driven by electromagnetic operating force presses a push rod, which in turn presses the valve body.

In this case, even if the spring force of the overtravel spring that presses the push rod via the spring bearing member acts eccentrically due to the inclination of the movable iron core, the synthetic resin is By providing the spring bearing member and the pressing member made of aluminum, the component force of the spring force that acts eccentrically is almost absorbed by the cushioning properties of these members, so that the valve body is pressed evenly. Therefore, uneven wear and leakage due to the inclination of the valve body can be prevented.

In addition, by making the spring receiving member and pressing member provided between the push rod, the movable iron core, the label spring, and the valve body cushioned by using synthetic resin, chattering caused by the use of the push rod can be eliminated. Wear on the contact surface can be significantly reduced.

[Embodiment] Fig. 1 shows an embodiment in which the present invention is applied to a poppet-type three-port valve, in which a valve body 2 incorporated in a valve body 1 is slid by an electromagnetic operation part 3 to control the direction of fluid flow. It is configured to switch.

The valve body 1 has an input port 11, an output port 12, and a discharge port 13. A valve body 2 is disposed in a valve chamber 14 that communicates these ports, and valve stems on both sides of the valve body 2 are arranged. 21, 21 are inserted into the sliding portion 15 of the valve body 1 and the valve seat body 16 fitted to the valve body 1 via the seal member 22 so as to be slidable in the axial direction.

A valve member 23 that opens and closes the output port 12 to the input port 11 and the discharge port 13 is provided in the center of the valve body 2, and a valve member 23 that opens and closes the output port 12 to the input port 11 and the discharge port 13 is provided at the end of the valve stem 21 on the electromagnetic operation unit 3 side. A pressing member 24 made of synthetic resin is provided that comes into contact with the push rod 31, and the valve body 2 is urged toward the return side by the urging force of a return spring 25 provided at the end of the valve rod 21. There is.

The other end of the push rod 31 is connected to a movable core 3 which is attracted to a fixed core 33 by energizing the electromagnetic coil 32.
4, it is in contact with a synthetic resin spring receiving member 37 that is biased toward the push rod 31 by an overtravel spring 36, and the movable iron core 34 and the overtravel spring 36 are in contact with each other. It is configured to absorb the stroke difference with the valve body 2.

The pressing member 24 and the spring receiving member 37 are made of so-called engineering plastics, such as polyamide resin, polyacetal resin, polybutylene tereftate resin, tetrafluoroethylene resin, etc.
Alternatively, it may be formed of these resins reinforced with glass fibers, but if the buffer member has lubricating properties in addition to buffering properties, it is effective in reducing the sliding resistance of the valve body 2. be.

In the solenoid valve having the above configuration, when the electromagnetic coil 32 is de-energized, the valve body 2 is in a position moved upward by the biasing force of the return spring 25, as shown in FIG. Port 11 and output port 1
The first valve seat 17 between the output port 12 and the discharge port 13 is closed, and the second valve seat 18 between the output port 12 and the discharge port 13 is opened.

In this state, when the fixed iron core 33 is made to attract the movable iron core 34 by energizing the electromagnetic coil 32, this attraction force is applied to the overtravel spring 3.
6. The push rod 31 is moved downward via the spring receiving member 37, and the push rod 31 moves the valve body 2 downward via the pressing member 24, but the valve body 2 is moved downward by the spring receiving member 37 and the pressing member 24. Since it is pressed evenly, uneven wear and leakage due to the inclination can be prevented.

In addition, since the spring receiving member 37 and the pressing member 24 are made of synthetic resin to provide cushioning properties, the valve body 2
These members 37, 24 for evenly pressing the
This eliminates the chattering that accompanies the use of the push rod 31, thereby preventing wear on the contact portions between the push rod 31, the overtravel spring 36, and the valve body 2.
These effects are the same even when the electromagnetic coil 32 is de-energized and the valve body 2 is returned to its original state by the biasing force of the return spring 25.

In addition, in the above-mentioned example, it is a poppet type, but
The present invention can also be applied to a spool-type solenoid valve, and the number of ports is not limited to three ports.

[Effects of the invention] According to the solenoid valve of the present invention, it is possible to prevent uneven wear and leakage due to the inclination of the valve body, and by reducing the wear of the abutment part, it is possible to prevent poor adsorption of the solenoid operating part due to wear particles and the valve. Since there is no sliding failure of the body, the life of the solenoid valve can be extended.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional front view of an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Valve body, 2... Valve body, 3... Electromagnetic operation part, 24... Pressing member, 31... Push rod, 34...
Movable iron core, 36... Overtravel spring, 37
...Spring receiving member.

Claims (1)

[Claims for Utility Model Registration] An electromagnetic operating section, a return spring that resists the operating force of the electromagnetic operating section, a push rod and a valve body between these, and the operating force is applied to the valve body via the push rod. In a solenoid valve that switches the direction of fluid flow by transmitting a signal, a spring receiving member is provided between the overtravel spring of the movable iron core and the push rod in the electromagnetic operation section, and a pressing member for the valve body is provided between the push rod and the valve body. established,
A solenoid valve characterized in that the spring receiving member and the pressing member are made of synthetic resin to provide cushioning properties.