JPS62215178A - Self-retaining type solenoid - Google Patents

Abstract

PURPOSE:To stabilize working voltage and prevent a gas leak by recessing an O-ring insertion part for the fixed iron core of a self-retaining type solenoid used for the electromagnetic valve of a gas apparatus and the like. CONSTITUTION:A portion 4b for housing the O-ring 6 of a fixed iron core 4 is recessed and 'A' dimensions are made about 0.6mm larger than the wire diameter (phid) of the O-ring 6. Also, the fixed iron core 4 is pressed at a stepped retained part 4a with the retaining part 5b of a guide pipe 5 having a similar step. The retained part 4a of the fixed iron core 4 is directly pressed with the retaining part 5b of the guide pipe 5 and the O-ring 6 is compressed only in an axial direction, thereby stabilizing working voltage and preventing the occurrence of a gas leak.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is used in solenoid valves for gas appliances, etc. The permanent magnet is attracted and held by the attraction force of the permanent magnet, and the attraction of the permanent magnet is increased by energizing the electromagnetic coil. This invention relates to a self-holding solenoid that reduces force and separates a movable core from a fixed core using spring force, and relates to the configuration of the fixed core.

2. Description of the Related Art In general, a self-holding solenoid has an electromagnetic coil 1, as shown in FIG. 2 covers,
A permanent magnet 3 is provided at the inner bottom of the fixed yoke 2, and a fixed iron core 4 is provided above the permanent magnet 3. The guide pipe 5 fits into the inner hole 1a of the electromagnetic coil 1, the O-ring 6 enters between the fixed iron core 4 and the guide pipe 5, the holding fitting 7 covers from above, and the O-ring 6 fits into the cut-and-raised part 2a of the fixed yoke 2. It is fixed with screw 8. Reference numeral 9 denotes a movable iron core, which is inserted into the hole 5a inside the guide pipe 5, and has a notched cut portion 9a in the upper part.
The valve rubber 10 and valve rubber receiver 11 are inserted. Movable iron core 9
A groove 9b is provided at the top of the plate, into which a flat washer 12 and an E-shaped retaining ring 13 are inserted. Spring 14 is valve rubber receiver 1
1 and the holding fitting 7.

Normally, the fixed iron core 4 and the movable iron core 9 are attracted and held by the magnetic force of the permanent magnet 3 against the force of the spring 14, and by energizing the electromagnetic coil (vl), the permanent magnet 3 is moved in the opposite direction. Electromagnetic force is generated to reduce the attractive force, and the repulsive force of the spring 14 moves the fixed core 4 to the movable core 9.
alienate.

Page 3 Problems to be Solved by the Invention However, in the above configuration, since the O-ring 6 is located between the fixed core 4 and the guide pipe 5, when the movable core 9 separates from the fixed core 4, The reaction compressed the O-ring 6, and the fixed iron core 4 separated from the permanent magnet 3, making the operating voltage unstable. Also, since the O-ring 6 is compressed from both the axial and longitudinal directions, the hole 5a of the guide pipe 5
The gas that has flowed in further passes through the gaps between the fixed iron core 4, the permanent magnet 3, and the guide pipe 5, and flows out from within the fixed yoke 2 through the rear hole of the burr raising part 2a, causing gas leakage.

The present invention solves the above-mentioned conventional drawbacks, and aims to stabilize the operating voltage and prevent gas leakage.

Means for Solving the Problems In order to solve the above problems, the present invention provides a concave O-ring insertion portion of the fixed iron core.

Operation With the above configuration, the present invention directly presses the fixed iron core against the guide pipe and compresses the O-ring only in the axial direction, so the operating voltage is stabilized and no gas leakage occurs.

EXAMPLE An example of the present invention will be described below based on the drawings. FIG. 1 shows a cross-sectional view of a self-retaining solenoid according to an embodiment of the present invention.

The same parts as those in the conventional example described above are given the same numbers, detailed explanations are omitted, and different parts will be mainly explained.

In FIG. 1, 4 is a fixed iron core, 5 is a guide pipe, and 6 is an O-ring. O-ring 6 of fixed core 4
The shape of the part 4b into which is inserted is concave as shown in the figure, and the dimension is
The wire diameter yd of the ring 6 should be about 0.6 mm larger. Still in the fixed core 4, the pressed part 4a, which is formed with steps, is the pressed part 5b, which is formed with steps in the same way, of the guide pipe 5.
be held down. When the movable iron core 9 separates from the fixed iron core 4, the fixed iron core 4 does not separate from the permanent magnet 3.

In the above embodiment, the O-ring insertion portion 4a of the fixed core 4
The pressed part 4a5 of the fixed core 4 is made concave, and the vane is made concave, the pressed part 4a of the fixed core 4 is directly pressed by the holding part 5b of the guide pipe 5, and the O-ring 6 is compressed only in the axial direction, so the operating voltage becomes stable and eliminates gas leaks.

Effects of the Invention As described above, the present invention can stabilize the operating voltage and eliminate the occurrence of fluid leakage.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of a self-holding solenoid according to an embodiment of the present invention, and FIG. 2 is a longitudinal sectional view of a conventional self-holding solenoid. 1... Electromagnetic coil, 2... Fixed yoke,
3... Permanent magnet, 4... Fixed iron core, 4
a...Pressed part, 4b...O-ring insertion part, 5...Guide pipe, 5b...
Presser section, 6...O-ring.

Claims (1)

[Claims] A self-holding solenoid comprising an electromagnetic coil, a fixed yoke and a permanent magnet provided outside the electromagnetic coil, a movable iron core and a fixed iron core arranged inside the electromagnetic coil, and in which the O-ring insertion part of the fixed iron is concave. .