JPH039579Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field This invention attracts the movable core toward the fixed core by energizing the electromagnetic coil, and causes the movable core to move back by cutting off the energization. This invention relates to a solenoid valve that controls the opening and closing of a valve port using a valve body provided therein.

Problems to be solved by conventional techniques and ideas A general solenoid valve has a guide tube installed in the center hole of an electromagnetic coil with a fixed core provided at one end, and a guide tube that protrudes from the guide tube into the guide tube. The movable core, which has a valve body at one end, is fitted by applying a moving force in the direction away from the fixed core due to spring elasticity, and the movable core is moved toward the fixed core within the guide cylinder by energizing the electromagnetic coil. The movable iron core is made to move back with spring elasticity by cutting off the current, and the valve body opens and closes the valve opening using the valve body described above. The smaller the value, the larger the value, so in order to attract the movable core against the spring elasticity with a small-capacity electromagnetic coil, the movable core must be stroked within a range close to the fixed core, and at the closest position, the movable core must be fixed. It is customary to make it hit the iron core. However, if the movable core butts against the fixed core, not only will it generate a clicking noise every time it operates, but the abutment surfaces of the movable core and the fixed core will wear out and deform, reducing durability. Since the iron core slides inside a metal guide cylinder, the sliding resistance between the two is large.
Moreover, it had the disadvantage of being easily worn out.

It is an object of the present invention to eliminate these drawbacks and provide a solenoid valve that does not generate noise and has excellent durability.

Embodiment An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

In FIG. 1, 1 is a main body, and a first port 2 on one side of its outer peripheral surface communicates with the upper surface of the main body 1.
A second port 3 is formed on the other side of the main body 1 and communicates with a valve port 4 formed in the center of the upper surface of the main body 1. At the top of the main body 1, an iron housing 6 housing an electromagnetic coil 7 is formed. A guide cylinder 8 made of 18-8 stainless steel, which is a weakly magnetic material, is fitted into the center hole 6a. The fixed iron core 10 installed in the guide tube 8 is fitted and fixed, and the valve port 4
A movable core 15 is fitted in which a valve body 13 that can come into contact with a valve seat 5 formed on the edge of the mouth is attached to the end face of the lower end, and a flange 16 formed at the lower end of the movable core 15 and the housing are fitted. The downward moving force is always applied by the elastic expansion force of the compression coil spring 17 installed between the housing 6, and by energizing the electromagnetic coil 7, the upper plate, side plate, and lower plate of the housing 6 are moved. A magnetic field directed from the movable core 15 to the fixed core 10 is formed through the movable core 15, as shown by the chain line in the figure.
is attracted toward the fixed iron core 10 above against the spring force of the compression coil spring 17, and by cutting off the electricity, the movable iron core 15 moves downwardly by the spring force of the compression coil spring 17. .

The above structure is the same as that of a conventionally known solenoid valve, but in this embodiment, the upper end surface and outer peripheral surface of the movable core 15 are made of urethane rubber, polyester resin, etc., which have excellent shock absorption and wear resistance. In addition, a protector 20 made of a material with a small coefficient of friction is attached. As shown in FIG.
At the upper end, a buffer body 22 that is attached to the upper end surface of the movable iron core 15 is integrally formed as a lid that closes the opening of the cylindrical body 21, and a ventilation hole 23 is formed in the center of the buffer body 22. It is tightly fitted to the movable core 15 and fixed with adhesive, and the buffer body 22
The vent holes 23 formed in the movable iron core 15 are for discharging air remaining inside when fitting the movable iron core 15, thereby facilitating the fitting work.

The solenoid valve of this embodiment has the above-described structure, and when the electromagnetic coil 7 is energized and energized, the movable core 15 is attracted toward the fixed core 10 and moves upward, as shown by the chain line in FIG. When the valve body 13 separates from the valve seat 5 and the valve port 4 opens, air flowing from the first port 2 into the space 18 on the top surface of the main body 1 passes through the valve port 4 and flows into the second port 3. flows into the electromagnetic coil 7, and when the current is cut off to the electromagnetic coil 7 to make it into a de-energized state,
As shown by the solid line in FIG. 1, the movable core 15 is moved downward by the spring force of the compression coil spring 17,
When the valve body 13 is pressed against the valve seat 5 and the valve port 4 is closed, it acts to block the flow of air, and when the electromagnetic coil 7 is energized, the movable iron core 15 is attracted to the fixed iron core 10. In the event that
The movable core 15 collides with the fixed core 10 at high speed, but since the shock absorber 22 with excellent shock absorption is fixed to the upper end surface of the movable core 15,
Direct collision of the movable core 15 with the fixed core 10 is avoided, and the shock absorber 22 elastically contracts between the movable core 15 and the fixed core 10 to absorb the impact force caused by the collision. This prevents noise from occurring due to collisions between the cores, resulting in quiet operation, and
It prevents wear and deformation of 0.15 and ensures stable operation over a long period of time.
Experiments have confirmed that the improvement is more than 1000 times.

In this embodiment, since the cylindrical body 21 made of the same material as the buffer body 22 and having excellent wear resistance and a small coefficient of friction is attached to the outer periphery of the movable core 15, the movable core 15 Since the cylinder body 21 is prevented from sliding in direct contact with the guide cylinder 8, and the cylinder body 21 is slid against the guide cylinder 8, sliding resistance is reduced and wear is prevented. Since the buffer body 22 and the cylindrical body 21 are integrally formed, there is an advantage that they can be easily fixed to the movable iron core 15.

Structure and effects of the device As specifically explained in the above embodiments,
In the solenoid valve of the present invention, a guide cylinder is attached to the center hole of an electromagnetic coil having a fixed iron core at one end, and a movable iron core is placed inside the guide cylinder and has a valve body at one end protruding from the guide cylinder. , the movable iron core is moved back and forth by energizing and de-energizing the electromagnetic coil, and the valve body opens and closes the valve port. In the solenoid valve, a protective body consisting of a cylindrical body fitted around the outer periphery of the movable core and a buffer body attached to an end face of the movable core corresponding to the fixed core is integrally molded from synthetic resin. However, since the cushioning body is provided with ventilation holes, the impact force when the movable core collides with the fixed core is absorbed by the cushioning body, and noise generation is prevented and the movable core The sliding resistance of the guide tube is reduced, improving durability, and since the air inside escapes from the ventilation hole, the protector can be easily fitted onto the movable core.

[Brief explanation of drawings]

FIG. 1 is a sectional view of an embodiment of the present invention, and FIG. 2 is a perspective view of its protector. 4... Valve port, 7... Electromagnetic coil, 8... Guide tube, 10... Fixed iron core, 13... Valve body, 15...
Movable iron core, 20... Protective body, 21... Cylindrical body, 22
...buffer, 23...ventilation hole.

Claims (1)

[Scope of utility model registration request] A guide tube is attached to the center hole of an electromagnetic coil that has a fixed core at one end, and a movable core, which has a valve body at one end that protrudes from the guide tube, is inserted into the fixed core by spring elasticity. In the electromagnetic valve, the electromagnetic valve is fitted by applying a moving force in a direction away from the electromagnetic coil, and the movable iron core is caused to reciprocate by energizing and de-energizing the electromagnetic coil, and the valve body opens and closes the valve port. A protector consisting of a cylindrical body fitted around the outer periphery of the movable core and a buffer body attached to an end face of the movable core that corresponds to the fixed core is integrally molded from synthetic resin, and the protector body is made of a synthetic resin and is passed through the buffer body. A solenoid valve characterized by having pores formed therein.