JPS6336920Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a movement prevention device for a fixed core in an electromagnetic contactor.

In the electromagnetic contactor, as shown in FIG. 1, a movable element 1 for driving a movable contact 11 that comes into contact with and separates from a fixed contact of a terminal plate 12 attached to a casing 5 is a movable element of an electromagnet. Spring 4 to iron core 2
The fixed iron core 13 is configured to be fixed to a substrate 16 attached to the bottom surface of the casing 5. A cushioning rubber seat 1 is provided between the fixed iron core 13 and the substrate 16 to absorb the shock when the electromagnet is attracted.
9 is interposed, but conventional cushioning rubber seats have a constant thickness or have wart-like protrusions protruding from the entire surface of the contact area with the fixed iron core 13, but with a constant thickness, the rigidity is low. In the latter case, the fixed iron core 13 has a large lateral wobbling, and the magnetic pole face with the movable iron core 2 becomes misaligned during repeated operations, resulting in an increase in magnetic resistance. There were flaws.

The present invention aims to eliminate such conventional drawbacks, obtain a predetermined elasticity, and prevent movement (displacement) of the iron core.

This idea involves interposing a buffer rubber seat between the bottom surface of the fixed core of the electromagnet that drives the movable contact housed in the casing of the electric contactor and the fixed core mounting surface in the casing, and attaching the fixed core to the casing. In the mounting device, a groove along the stacking direction of the fixed iron core is formed in a required part of the bottom surface of the fixed iron core, and a groove is formed in a part opposite to the groove on the surface of the buffer rubber seat that is in close contact with the bottom surface of the fixed iron core. This invention relates to a device for preventing movement of a fixed core in an electromagnetic contactor, characterized in that a protrusion perpendicular to the direction of the groove is formed and a wart-like protrusion is formed in the other part.

FIG. 2 and FIG. 3 show an embodiment of the present invention, in which a groove 13a is provided on the bottom surface of the fixed core 13 along the stacking direction of the core, and a groove 13a is provided in the buffer rubber seat 19 to be perpendicular to the groove 13a. By providing the protrusion 19b in a protruding manner and providing the remaining portion with wart-like protrusions 19a, the elasticity of the cushioning rubber seat 19 is ensured in an optimum state, and sideways wobbling of the fixed iron core 13 is prevented. Therefore, the groove 13a of the fixed iron core 13 and the protrusion 19b of the buffer rubber seat 19 come into contact with each other in a perpendicular state. Note that the groove 13a of the fixed core 13
Although they are formed on both sides of the bottom surface, they do not necessarily have to be formed at these locations, or may be formed on the entire bottom surface.

In FIG. 1, 14 is an excitation coil, 15 is a repulsion spring that restores the mover 1 upward when it is not excited, 17 is a core receiver box fixed to the substrate 16, 18 is a spacer, and 20 is a core receiver box 17. A pin 21 movably connects the fixed iron core 13 to the frame 22 of the excitation coil 14, and a spring seat 24 receives the other end of the coil spring 23, one end of which is fixed to the frame 22 of the excitation coil 14, and presses and supports the fixed iron core 13 against the base plate 16. One end is attached to the coil frame 22
This is a voltage display board made of thermoplastic resin that is fixed to the casing 5 and has the other end exposed outside the casing 5.

As described above, in this device, a groove is formed on the bottom surface of the fixed iron core, and protrusions and wart-like projections are formed on the cushioning rubber seat. This has the effect of preventing the fixed iron core from moving by using the groove and the protrusions, and of providing the appropriate elasticity by using the wart-like projections to ensure a cushioning effect.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing an electromagnetic contactor according to an embodiment of the present invention, FIG. 2 is a perspective view showing a fixed iron core, and FIG. 3 is a perspective view showing a cushioning rubber seat. 13: Fixed iron core, 13a: Groove, 19: Buffer rubber seat, 19a: Wart-like projection, 19b: Projection.

Claims (1)

[Scope of utility model registration request] In a device for attaching a fixed core to a casing by interposing a buffer rubber seat between a fixed core bottom surface of an electromagnet that drives a movable contact housed in a casing of an electromagnetic contactor and a fixed core mounting surface in the casing, A groove along the stacking direction of the fixed iron core is formed in a required part of the bottom surface of the fixed iron core, and a groove is formed in a portion of the buffer rubber seat that is in close contact with the bottom surface of the fixed iron core in a portion opposite to the groove. A device for preventing movement of a fixed iron core in an electromagnetic contactor, characterized in that a protrusion perpendicular to the direction and wart-like protrusions are formed in other parts.