JPH041701Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field The present invention relates to a core assembly of an oil-immersed solenoid.

(b) Prior Art Conventionally, the following structure was used to bleed air from an oil-immersed solenoid.

(1) As shown in Figure 3, an air vent plug a is provided separately from the manual push button b,
Since the air inside the plunger guide c accumulates at a high point e in the oil d, it can be extracted from the air vent plug a.

However, when solenoid f is installed, air cannot be removed if air vent plug a is located at a low location.To avoid this,
Air vent plugs a at several locations around the solenoid body g
There was a problem in that it was necessary to set up a

(2) As described in Japanese Utility Model Application No. 59-34172 and shown in FIG. 4, an air vent plug h is formed approximately at the center of the manual push button j. This makes the structure of the solenoid k more compact, but due to the way it is installed, if the air vent plug h is not located at a high place in the oil l, there is a problem that the air cannot be evacuated satisfactorily. .

(c) Problem to be solved by the invention The problem to be solved by the invention is to provide a method for satisfactorily venting air from the oil-immersed area in the plunger guide, pressure tube, or guide sleeve in an oil-immersed solenoid. To obtain a core assembly.

(d) Means for solving the problem The present invention is a solenoid for a solenoid in which a fixed iron core is fitted and fixed at one end of a pressure tube, a stopper is fixed at the other end, and a push button is disposed approximately in the center of the stopper. In the core assembly, a large diameter portion is formed at the plunger side end of the push button, and a plurality of radially extending portions are formed on at least one of the end surface of the stopper on the fixed core side and the surface of the large diameter portion on the stopper side. a groove is formed in the push button, an air vent hole extending in the axial direction is formed in the push button, a stopper is removably provided at the open end of the air vent hole, and the push button has a hole extending in the radial direction from the air vent hole to the outer periphery. The structure is characterized by the fact that it has been formed.

(E) Function To vent air in an oil-immersed solenoid using the solenoid core assembly with the above configuration, remove or loosen the stopper of the push button, and the inner side of the stopper submerged in oil in the pressure tube should be removed. The air collected near the surface of the button passes through the radial hole of the push button via the radial groove due to the internal pressure, and escapes to the outside from the open end of the air vent hole.

(F) Embodiments Examples of the present invention will be described below with reference to the drawings.

In FIG. 1, 1 is an oil-immersed solenoid equipped with a solenoid core assembly (hereinafter referred to as core assembly) 2 according to the present invention, and a coil 10 and a frame 11 are arranged around the outer periphery of the core assembly 2. A plunger 12 is inserted into the inside.

The core assembly 2 includes a pressure tube 3, a fixed iron core 4 fixed to one end thereof, a stopper 5 fixed to the other end, and a guide sleeve 7 fixed to the inside of the pressure tube 3 via a guide holder 6. There is.

A push button 8 is provided in a hole formed approximately at the center of the stopper 5 so as to be movable in the axial direction of the stopper 5. The plunger side end of this push button is formed into a circular shape having a larger diameter than other parts, and the back annular part 8 of this large diameter part 81
2 is in contact with the end surface 51 of the stopper 5.

The body of the push button 8 includes, in order from the plunger 12 side, the large diameter portion 81, then the polygonal portion 83,
Finally, a circular part 84 is formed, and a polygonal part 8
3 is a corresponding polygonal hole 5 formed in the stopper 5
2 to prevent the push button 8 from rotating (Fig. 2).

A non-penetrating air vent hole 85 extending from the outside of the solenoid 1 in the direction of the shaft support is formed approximately at the center of the push button 8 in the radial direction.
1 (located in substantially the same plane as the back annular portion 82). An outer circumferential groove 86 and the air vent hole 8 are provided at the base 82a of the push button 8.
5 (FIG. 2).

A screw hole is formed at the open end of the air vent hole 85 of the push button 8, and a stopper 88 is attached thereto.

A plurality of grooves 53 extending in the radial direction are formed in the end surface 51 of the stopper 5.

In the oil-immersed solenoid 1 having the core assembly 2 configured as described above, in order to vent air, the stopper 8
Remove or loosen 8. Then, pressure tube 3
The air in the oil that gathers near the inner end surface of the pushbutton 8 flows radially inward in the radial groove 53, enters the outer circumferential groove 86, and passes through the radial hole 87 and air vent hole 85. After that, go outside.

In the above embodiment, the groove is formed on the end face of the stopper, but it may be formed on the back side of the large diameter portion of the push button, that is, the face on the stopper side, or on both sides.

(G) Effect The oil-immersed solenoid having the core assembly of the present invention allows air to flow smoothly in the oil-immersed area even when the solenoid is installed vertically with the stopper facing upward, as well as when the stopper side is installed horizontally. It has the effect of being discharged to the outside.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a solenoid having a core assembly according to the present invention, FIG. 2 is a sectional view taken along the line AA in FIG. 1, and FIGS. 3 and 4 are sectional views of a solenoid according to the prior art. 1...Oil-immersed solenoid, 2...Core assembly,
3...Pressure tube, 4...Fixed iron core, 5...Stopper, 51...Stopper end face, 53...Radial groove, 6...Guide holder, 7...Guide sleeve, 8...Push button, 81... Large diameter section, 8
2... Back annular part, 83... Polygonal part, 85...
Air vent hole, 86... outer circumferential groove, 87... radial hole, 88... closing plug.

Claims (1)

[Scope of utility model registration request] Fit and fix the fixed iron core to one end of the pressure tube,
In a core assembly for a solenoid comprising a stopper fixed to the other end and a push button disposed approximately in the center of the stopper, a large diameter portion is formed at the end of the push button on the plunger side, and a large diameter portion is formed on the end of the push button on the plunger side, and the fixed core side of the stopper a plurality of grooves extending in the radial direction are formed in at least one of the end surface of the push button and the surface of the large diameter portion on the stopper side, an air vent hole extending in the axial direction is formed in the push button, and the open end of the air vent hole is closed. 1. A core assembly for a solenoid, characterized in that a stopper is removably provided, and a hole is formed in the push button that extends in a radial direction from the air vent hole to the outer periphery.