JPH0141985Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a poppet type solenoid valve.

Conventionally, a poppet type solenoid valve is known in which a poppet valve in a valve body is driven by electromagnetic force in a solenoid, and the poppet valve switches a fluid passage in the valve body. for example,
Japanese Utility Model Publication No. 53-76323 discloses that when a solenoid is energized to attract a movable core to a fixed core, a push rod (auxiliary plunger) driven by the movable core moves a poppet valve with a spring for return. The valve part of the poppet valve opens and closes the valve seat in the valve chamber of the valve body to switch the fluid passage, and also stops the energization of the solenoid to reduce the electromagnetic attraction between the two iron cores. When it disappears, the poppet valve returns to its original position while separating the movable core from the fixed core due to the biasing force of the return spring, thereby returning the fluid passage inside the valve body to its original state. Valve is shown.

However, in such a solenoid valve,
Since there is no guide to guide the poppet valve as it slides in the valve chamber, it is inevitable that the poppet valve will slide in an inclined position, which causes both ends (main shaft) of the poppet valve shaft to touch the valve body of the valve body. The valve part of the poppet valve comes into contact with the valve seat of the valve body in an inclined state, causing uneven sliding contact with the indoor surface, causing uneven wear on both, and the valve part is not seated on the valve seat. Not only is the sealing force uneven and sufficient sealing effect not obtained, uneven wear is induced on the valve part and valve seat, and furthermore, the push rod is in direct contact with one end face of the poppet valve. It is inevitable that their contact surfaces will wear out.

The purpose of the present invention is to prevent the poppet valve from being driven in an inclined state and coming into contact with the valve seat, and to prevent the contact surfaces of the poppet valve and the push rod from being worn out. Our purpose is to provide solenoid valves.

The solenoid valve of the present invention that achieves the above object is such that the poppet valve in the valve body is driven by the electromagnetic force in the solenoid, and the poppet valve switches the fluid passage in the valve body. Each of the valve bodies is provided with a guide body that slides into the guide cylinder portion of the valve chamber of the valve body and guides the sliding movement of the poppet valve in the axial direction,
A push rod driven by a solenoid is brought into contact with a guide at one end of the poppet valve, and the guide at the other end of the poppet valve serves as a spring seat for a return spring, and these guides are made of a soft material. It is characterized by:

In the solenoid valve configured as described above, the sliding movement of the poppet valve is guided in an appropriate state along the inner surface of the guide cylinder in the valve chamber of the valve body by guide bodies disposed at both ends of the poppet valve. This prevents the poppet valve from sliding in a tilted position and causing uneven wear, and prevents the poppet valve from tilting against the valve seat of the valve body. In addition, the poppet valve and push rod are brought into contact with each other via a soft guide so that they do not come into direct contact with each other. And wear on the contact surface of the push rod is prevented.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

In FIG. 1, 1 is a solenoid, and 2 is a valve body. By switching the electromagnetic coil 3 in the solenoid 1 between a non-energized state and an energized state, a poppet valve 5 disposed in a valve chamber 4 of the valve body 2 is activated. , is configured to be switchable between the illustrated first switching position and a second switching position that is moved downward from that position.

In the valve body 2, both ends of the shaft portion of the poppet valve 5 disposed in the valve chamber 4 are in sliding contact with the guide cylinder portions 6 and 7 in the valve chamber 4 of the valve body, respectively, so as to extend in the axial direction of the poppet valve 5. A push rod 10 driven by a solenoid is brought into contact with one guide body 8 of the poppet valve 5, and the other guide body 9 of the poppet valve 5 is brought into contact with a push rod 10 driven by a solenoid. It also functions as a spring seat for the return spring 11.

These guide bodies 8 and 9 are made of a soft and wear-resistant material such as synthetic resin, and thereby hold the poppet valve so that it can slide along the guide cylinder portion in the valve chamber 4. Although it is a push rod 1
The guide body 8 that comes into contact with the poppet valve 5 and the push rod 1
This also prevents wear on the contact surfaces caused by direct contact with the contact surfaces. Note that the guide bodies 8 and 9 do not necessarily need to be held fixedly with respect to the poppet valve 5, nor do they need to be configured as cylindrical bodies whose outer shape closely contacts the guide cylinder parts 6 and 7. .

Further, the push rod 10 driven by the solenoid 1 is attached via a spring 14 and a spring retainer 15 to the movable core 13, which is attracted to the fixed core 12 by energizing the electromagnetic coil 3. The spring 14 absorbs the difference in stroke between the movable core 13 and the poppet valve 5, and at the same time applies a closing pressure to the poppet valve 5.

In the electromagnetic valve having the above configuration, when the electromagnetic coil 3 is de-energized, the poppet valve 5 is located at the first switching position due to the urging force of the return spring 11, as shown in FIG. The force is transmitted to the movable core 13 via the push rod 10 and the spring 14, so that the movable core 13 is in an upward movement position away from the fixed core 12.

Next, when the electromagnetic coil 3 is energized, the movable core 13 is attracted to the fixed core 12, the spring 14 is compressed, and the poppet valve 5 resists the biasing force of the return spring 11 via the push rod 10 due to its biasing force. The poppet valve 5 is thereby switched to the second switching position.

As mentioned above, the poppet valve 5 moves up and down as the current is turned on and off to the electromagnetic coil 3, and this up and down movement is guided by the guide bodies 8 and 9 mounted on both ends of the poppet valve 5. Therefore, the poppet valve 5 is
This prevents the valve portion of the poppet valve 5 from sliding inside the poppet valve 5 while being tilted, or from coming into contact with the valve seat while being tilted. Therefore, uneven wear of the seal members 17, 17 fitted to the poppet valve 5, the shaft portion and valve portion of the poppet valve 5, the inner surfaces of the guide cylinder portions 6, 7 of the valve chamber 4, etc. is not only prevented; Seal failure between the valve portion of the poppet valve 5 and the valve seat is reliably prevented.

Also, the poppet valve 5 is controlled by the guide bodies 8 and 9.
The above seal member 1
7 and 17 do not have the function of guiding the sliding movement of the poppet valve 5, and have a cross-sectional shape as shown in the figure, for example, and have a small pressure contact force against the inner surface of the guide cylinder portions 6 and 7 of the valve chamber 4, so that they do not have the function of guiding the sliding movement of the poppet valve 5. It is possible to use a material that is easily deformed by the pressure of the seal member, thereby making it possible to extremely reduce the sliding resistance due to the seal member.

In addition, in the figure, 18 indicates a cap placed on the movable iron core.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an embodiment of the present invention. 1...Solenoid, 2...Valve body, 4...Valve chamber,
5... Poppet valve, 6, 7... Guide tube section, 8, 9... Guide body, 10... Push rod, 11... Return spring.

Claims (1)

[Scope of utility model registration request] In a device in which a poppet valve in a valve body is driven by an electromagnetic force in a solenoid, and the poppet valve switches the fluid passage in the valve body, a guide tube in the valve chamber of the valve body is provided at both ends of the poppet valve shaft. A guide member is installed on the crown to guide the sliding movement of the poppet valve in the axial direction, and a push rod driven by a solenoid is brought into contact with the guide member at one end of the poppet valve, and a guide member at the other end of the poppet valve is provided. is a spring seat of a return spring, and these guide members are made of a soft material.