JPH01279535A - Solenoid relay - Google Patents

Abstract

PURPOSE:To decrease exhaust of a contact due to arc discharge at the time of current shutoff by furnishing an insulation block with a part protruding in such a way as in close contact with one surface of a contact spring, and by quickly damping vibration of the contact spring. CONSTITUTION:A movable contact spring 1 of an insulation block 2 is fixed by insert molding. Part of this block 2 protrudes in the longitudinal direction of the spring 1, and a protrusion 3 is formed which is in close contact with that bottom surface where an electric contact is furnished. Because made by insert molding, the protrusion 3 is in close contact with the spring 1, but no pressing force is generated. Accordingly vibration of the spring 1 can be damped quickly without influencing the load characteristic, so that exhaust of the contact due to arc discharge of current shut off can be decreased. The shape of the protrusion 3 is made smaller than the contour of the spring 1, and attachment to the contact spring surface because of insert molding is prevented.

Description

[Detailed description of the invention] Regarding switching electromagnetic relays.

[Conventional technology]

Conventionally, this type of electromagnetic relay has a central edge base 10 of a U-shaped iron core 4 around which a coil 11 is wound, as shown in FIG.
It is equipped with A relay having such a structure is described in Japanese Patent Application No. 137265/1983 filed by the same applicant.

[Problem to be solved by the invention]

In the conventional electromagnetic relay described above, when the movable contact spring 7 closes the contact, the vibration caused by the collision between the ballast 6 and the iron core 4 (i.e., on the contact closing side) is transmitted by the movement of the 7 rectifier, resulting in a large amplitude and instability. It becomes a movement. For this reason, there is a problem in that the arc that occurs when the current is cut off tends to continue, accelerating the wear of the contacts.

[Means to solve the problem]

The present invention provides a coil assembly having a U-shaped iron core around which a coil is wound and a permanent magnet, and an electromagnetic relay including the coil assembly, in which the insulator block is brought into contact with one surface of the movable contact spring. The protrusion is integrally molded.

〔Example〕

It is a partially enlarged perspective view of the body seen from the bottom.

In FIG. 1, a part of the insulator book 2 that fixes the movable contact spring 1 by insert molding is attached to the contact spring 1.
protrudes in the longitudinal direction of the bottom surface of the contact spring 1 (i.e.
A protrusion 3 is formed that comes into close contact with the surface on which the electrical contact 12 is provided. The rest of the structure is the same as that shown in FIG. Since this protruding portion 3 is made by insert molding of the movable contact spring 1, it does not generate any pressing force against the contact spring 1, but is merely in close contact with the movable contact spring 1.

Therefore, the vibration of the contact spring 1 can be rapidly damped without affecting the load characteristics. A protrusion 3 having the same structure is also formed on the contact spring 1 on the opposite side (not shown). As shown in FIGS. 2(a) and 2(b), the shape of the protrusion 3 is made smaller than the outer shape of the contact spring 1 in order to prevent it from sticking to the contact spring surface due to insert molding.

Next, the detailed operation of the embodiment is shown in FIGS. 3(a) and (b).
This will be explained with reference to FIGS. 4(a) and 4(b).

FIG. 3(a) shows the contact closed state, in which the fixed contact 13 and the movable contact 12 are in contact. Contact spring 1 has protrusion 3
0 to the opposite side (upward) to generate a pressing force on the movable contact 12. At this time, since a gap is created between the protrusion 3 and the contact spring 1, the fixed end of the contact spring becomes point A, and there is no difference in characteristics from the case where the protrusion 3 is not provided. Figure 3 (
b) shows the contact open state, and the contacts 13.12 are open. The vibration of the contact spring 1 that occurs when the contact is changed from the closed state to the open state is reduced in amplitude and the damping time is shortened because the fulcrum of the vibration is changed to point B by the protrusion 3. Figure 4 (b) In the conventional configuration, as shown in Figure 6, the vibration fulcrum of the contact spring 1 when transitioning to the contact open state is also at point A, so the amplitude of vibration is large and the time until damping is also long ( Figure 4(a)).

FIG. 5 shows another embodiment of the invention. In this embodiment, the protrusion 31 is formed into a tapered shape in consideration of moldability.

〔Effect of the invention〕

As explained above, the present invention can rapidly attenuate the vibration of the contact spring by protruding a part of the insulator block so as to come into close contact with one side of the contact spring that performs the flexure action. , contact wear due to arc discharge during current interruption can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of one embodiment of the present invention, FIGS. 2(a) and (b) are a plan view and a side view of the same embodiment, respectively, and FIGS. 3(a) and (b) are the same embodiment. 4(a) and 4(b) are characteristic diagrams of a conventional structure and an embodiment of the present invention, respectively. FIG. 5 is a side view of another embodiment of the present invention. The figure is a side view of the conventional structure, and FIG. 7 is a side view illustrating the operation in FIG. 6. l...Contact spring, 2...Insulator block, 3...Protrusion. Kaya fTf! J Kaya 2nd edition (a) $2 Figure (b) 3rd m<a) i 3rd page (b) (E) (b) $4 r! I.J.

Claims (1)

[Claims] A coil assembly having a U-shaped iron core around which a coil is wound and a permanent magnet, an armature terminal arranged on the coil assembly and seesawing in response to excitation of the iron core, and the armature terminal; an electromagnetic relay comprising: a movable contact spring having one end fixed by an insulator block and switching a contact in conjunction with the armature terminal; An electromagnetic relay characterized in that a contacting protrusion is integrally molded.