JPS5831009Y2 - Electromagnet assembly for wet type solenoid valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electromagnet assembly for a wet type solenoid valve, and more particularly to an improvement in the manual push rod within the electromagnet assembly.

A so-called wet type electromagnetic valve in which the plunger operates in oil has the advantage that the plunger is lubricated by oil, so there is less wear, and the operation of the plunger is buffered by oil, which reduces noise.

However, with conventional structures such as this wet type solenoid valve equipped with a manual bushing rod, the bushing rod's O
There was a problem with oil leaking from the ring part.

That is, in the wet type solenoid valve shown in FIG.

Back pressure is directly applied to the plunger guide b into which the plunger a is loosely fitted when the valve is switched.

This back pressure varies in degree, but it is about 10 to 210 kg/2, and it quickly decreases to zero.

That is. Pressure changes between 10 and 210 to 9/2 will be repeated over 0 m.

For this reason, force is applied to the bushing rod due to the elasticity of the metal or O-ring or the pressure fluctuation of air bubbles in the oil.

By the way, the bushing rod C of the conventional solenoid valve is.

Since the structure shown in Figure 1 allows for relatively easy axial movement, the force causes reciprocating motion, which causes an increase in O.
The ring seal d wears out and oil leaks.

The present invention was developed in view of these problems,
The purpose is to prevent the bushing rod from moving even with such pressure fluctuations.

Thereby, it is an object of the present invention to provide an electromagnet assembly for a wet type solenoid valve which prevents oil leakage due to wear of the 01J ring seal as described above.

A feature of the electromagnet assembly according to the present invention is that the inner end of the bushing rod is provided with a tapered part that can be inserted into a stopper that slidably supports the bushing rod.

An embodiment of an electromagnet assembly according to the present invention will be described below with reference to the drawings.

In FIG. 2, 1 is an electromagnet assembly, 2 is a plunger guide, 3 is a solenoid provided outside the plunger guide, 4 is a fixed iron core that is fitted and fixed to one end of the plunger guide, and 5 is the other part of the plunger guide 2. A stopper 6 fitted and fixed at the end is a plunger inserted into the plunger guide 2.

A hole 5a passing through the stopper 5 in the axial direction is formed, and a manual bushing rod is movably inserted into the hole.

The bushing rod 7 has an annular groove 7 for an O-ring seal 8.
a is formed, and a conical tapered portion 7b that widens toward the end is formed at the inner end thereof.

As shown in detail in FIG. 3, the tapered portion 7b is
°The diameter d1 of the tip is larger than the diameter d of the hole 5a of the stopper 5, and the diameter d2 of the other end is smaller than the diameter d of the hole 5a, and the inclination angle θ is in the range of 20' to 60'O. There is.

Therefore, the outer circumference of the tapered portion 7b is at an angle θ'(θ'≦θ+
20) can be fitted with the contoured portion 5c.

In the above configuration, the back pressure 75 is applied to the inner end of the bushing rod 7.
When the cut is turned and pressed outward, since the angle of the tapered part 7b is acute, the tapered part sinks into the inner edge of the hole 5a and is fixed, preventing pressure fluctuations within the plunger guide thereafter. Butschrod won't move.

However, if the bushing rod is strongly pressed by hand from the outside flo, it can be easily moved.

The reason why the angle θ of the taper part is set to 20° to 60° is because if the angle θ becomes smaller than 20', the taper part of the bushing rod will become stuck inside the hole due to slight back pressure and will not be able to be moved just by pushing by hand. can be.

This is because if θ is larger than 60°, the taper portion will not penetrate into the hole easily and the bushing rod will easily start moving due to subsequent pressure fluctuations.

The choice of angle within that range depends on the pressure of the liquid being handled.

In this manner, in the electromagnet assembly according to the present invention, unnecessary movement of the bushing rod is stopped, and the wear of the O-ring seal due to this is also prevented.

Therefore, oil leakage due to wear of the O-ring seal can be prevented.

[Brief explanation of the drawing]

FIG. 1 is a partial sectional view of a conventional wet type solenoid valve. FIG. 2 is a sectional view of the electromagnet assembly according to the present invention, and FIG. 3 is an enlarged side view of the bushing rod. 1... Electromagnet assembly, 2... Plunger guide. 3... Solenoid, 4... Fixed iron core,
5... Stroller, 6... Plunger,
7... Butschrod. 7b... Taper part.

Claims (1)

[Claims for Utility Model Registration] A fixed iron core is fitted to one end of a plunger guide inserted into a solenoid, and a stopper is fitted to the other end. An electromagnetic assembly having a plunger movably inserted into the plunger guide and manually operable by a bushing rod movably mounted to the stopper, the inner end of the bushing rod having an angle of 200 to
An electromagnet set for a wet-type solenoid valve, characterized by having a tapered part with a diameter of 60' and a diameter at one end larger than the diameter of the hole in which it is installed and a diameter at the other end smaller than the diameter of the hole. Three-dimensional.