JPS61220218A - Contact switchgear - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a contact opening/closing device used in relays, switches, contactors, and the like.

[Background Art] This type of contact opening/closing device requires measures against contact welding due to arcs generated when turning on and off. For this reason, various contact materials with improved arc resistance have been studied. These contact materials are basically based on silver (Ag) with high melting point tungsten or 5n
This method involves dispersing Oz, InzOi, aio5, etc., and although it is effective as a countermeasure against welding by increasing the melting point, it also increases contact resistance and causes a problem of a large temperature rise.

On the other hand, mechanically, various types of relays have been studied, such as those seen in hinge-type relays, in which both the movable and fixed contacts are relatively slid (wiped) using the deflection of a leaf spring. However, there is a limit to the amount of wiping and the wiping force, and although the effect of cleaning the contact surface can be obtained, it is not satisfactory as a countermeasure against welding.

Therefore, the applicant of the present application proposed a contact opening/closing device as disclosed in Japanese Patent Application No. 12832/1983. In other words, the contacts provided on the two contacts are formed by arranging a high-melting point arc contact and a low-resistance conductive contact in parallel, and then insert the contacts.

The arc contacts function together when the connection is interrupted, and the conductive contacts function together during stable contact. As a result, a contact opening/closing device that can improve both welding resistance and contact resistance stability has been realized.

However, since both the recontactors are movable members, this method has problems in manufacturing, such as an increase in the number of parts and the need to improve the precision of parts.

[Object of the Invention] The present invention has been made in view of the above reasons, and its purpose is to provide a contact switching device that has a simple structure and can improve both welding resistance performance and contact resistance stability performance. On offer.

[Disclosure of the Invention] A contact opening/closing device according to the present invention includes a high-melting-point arc contact and a low-resistance conductive contact, each arranged in parallel so that the arc contact is located on the tip side, and fixed contacts arranged opposite to each other. and a movable contact, when the movable contact is driven by the driving means, it rotates around its base end from an open state to a state where the arc contacts contact each other, and the movable contact rotates about its base end until the arc contacts come into contact with each other. In a contact opening/closing device that rotates around the contact point after reaching the state, and in which the conductive contacts come into contact with each other when the rotation operation is completed, the movable contact has a magnetic piece in its intermediate part, and the movable contact has a magnetic piece at its base. An end is fixed to the tip of an extensible leaf spring, and the driving means is composed of an electromagnetic device, and the attracting member of the electromagnetic device is arranged to face the magnetic piece. .

(Example) An embodiment of the present invention will be described below with reference to FIG.

Reference numeral 1 denotes a fixed contact fixed to a base 2, which has two contacts, an arc contact 3a made of a high melting point material (for example, AgW, AgWC, etc.) and an arc contact 3a made of a low resistance material (for example, Ag, AgWC, etc.).
The conductive contacts 3b made of arc contacts 4, 3
The fixed contacts 3 are arranged in parallel so that B is located on the tip side. The fixed contact 1 is bent at a predetermined angle θ1 at an intermediate position between the two contacts 3a and 3b so that the tip side approaches a movable contact to be described later. Further, by extending the base end side of the fixed contact 10, it becomes a fixed contact terminal.

4 is a movable contact, and at its tip, like the fixed contact 3 of the fixed contact 1, there is a movable contact 5 composed of an arc contact 5a made of a high melting point material and a conductive contact 5b made of a low resistance material. They are arranged in parallel so that the arc contacts 5a are located on the tip side. This movable contact 4 is bent at an intermediate position between both contacts 5a and 5b so that the tip side is bent at a predetermined angle θ2 toward the side away from the fixed contact 1, and arc contact fA33.52 comrades, rumor? ! The contacts 3b and 5b are arranged to face each other. It is desirable that the predetermined angle θ2 is equal to or smaller than the angle θ1, and these angles θ1
．． When the re-contactor 1.4 is not bent as shown in Fig. 2, the re-contactor 1.
If the angle of 4 is d3, θ1+□θ2゛ζ2θ
It is desirable to set it to 3. Further, a magnetic piece 7 is attached to the middle part of the movable contactor 4 via an insulating stand 6.

Reference numeral 8 denotes a driving means such as an electromagnetic device (C), which is composed of an iron core 9 as an attraction member and a coil 10 wound around the outer periphery of the iron core 9. This electromagnet device 8 has an end face 9 of its iron core 9.
A is arranged so that it faces the magnetic piece 7.

When the magnetic piece 7 is driven by the magnetic attraction force from the core end face 9a, the movable contact 5 moves around the base end from the open state to the contact state between the arc contacts 3a and 5a. After the arc contacts 3a and 5a come into contact with each other, the arc contacts 3a and 5a rotate about the contact point, and when the rotation operation is completed, the conductive contacts 3b and 5b are arranged so as to be in contact with each other. Specifically, the movable contact terminal 1) fixed to the base 2
The base end of a leaf spring 12, which also serves as an electric circuit and is curved or bent in an expandable W shape, is fixed, and the base end of the movable contact 4 is fixed to the tip of the leaf spring 12. Therefore, the movable contact 4
Normally, that is, when not driven by the electromagnet device 8, it is in the open state due to the tension force of the leaf spring 12, and when it is driven by the electromagnet device 8,
The leaf spring 12 is compressed, and the spring force accumulated thereby acts as a contact force.

(Operation) FIG. 1(a) shows the open state. When the electromagnet device 8 is energized in order to change from this state to a contact state, the core end face 9
A magnetic attraction force from a acts on the magnetic piece 7. Therefore, the movable contact 4 rotates around its base end, and eventually the arc contact 3
A and 5a are in contact with each other (closed state), and the driven movable contact 4 now rotates around the contact point of arc contacts 3a and 5a, and the leaf spring 12 is rotated as shown in (b). compress. During this time, the gap between the conductive contacts 3b and 5b also decreases, and the conductive contact 3b is located just before the maximum displacement position of the movable contact 4.
, 5b contacts. Then, at the maximum displacement position of the movable contactor 4, the arc contacts 3a and 5a are separated from each other, and only the conductive contacts 3b and 5b are in contact with each other, as shown in (c). Conversely, when returning from the contact state to the open state, (C
)-(b)-(a).

As is clear from this operation, the arc contacts 3a and 5a function when the arc is turned on and off, and the conductive contacts 3b and 5b function when the contact is stable, improving both welding resistance and contact resistance stability. obtain. 'Moreover, the movable contactor 4 has a magnetic piece 7 in its middle part, and
The base end is fixed to the tip of the extensible leaf spring, and the core end face 9a of the electromagnet device 8 is arranged to face the magnetic piece 7, so both contacts can be rotated as in the conventional case. Needless to say, there is no need for electric wires for connecting the movable contacts 4 and movable contact terminals 1), and the contact opening/closing device has an extremely simple structure with a reduced number of parts.

In this embodiment, both contacts 1.4 are set at a predetermined angle θ1. Although the movable contact 4 is bent at θ2, the movable contact 4 may not be bent, and the leaf spring 8 may be curved or bent into a C shape, an S shape, or a multi-step shape.

FIG. 3 is an example in which the contact opening/closing device of the present invention is applied to a relay. That is, a contact opening/closing device is housed in a housing made up of a case 15 and a cover 16. The contact opening/closing device of this example is substantially the same as that described above, except that the movable contactor 4 is not bent, and the same members are given the same reference numerals. 17 is a coil terminal. Further, its operation is also similar to that described above.

[Effects of the Invention] Since the contact opening/closing device of the present invention is configured as described above, it is not necessary to make both contacts rotatable as in the conventional case, and the number of parts is reduced. The structure is extremely simple, and both welding resistance and contact resistance stability can be improved.

[Brief explanation of the drawing]

FIG. 1 is a side view of essential parts showing one embodiment of the present invention.
is an open state, (b) is a state after contact of the arc contact, (c) is a stable contact state, Fig. 2 is a side view for explaining the bending angle, and Fig. 3 is a contact of the present invention. FIG. 2 is an exploded perspective view of an example in which the switchgear is applied to a relay. 1-fixed contact, 3=-fixed contact, 4-movable contact, 5
- - Movable contact, 7 - Magnetic piece, 8 - Drive means (electromagnet device), 9 - Iron core (attraction member), 12 - Leaf spring, 3a,
5a, -7-1 contacts, 3b, 5b-m - conductive contacts. Patent applicant: Matsushita Electric Works Co., Ltd. Representative patent attorney: Toshimaru Takemitsu (and 2 others)

Claims (1)

[Claims] (1) A high-melting point arc contact and a low-resistance conductive contact are arranged in parallel with each other so that the arc contact is located on the tip side, and a fixed and a movable contact are arranged opposite to each other, and the movable contact When driven by the driving means, it rotates around the base end from the open state to the contact state between the arc contacts, and after reaching the contact state between the arc contacts, the shaft rotates around the contact point. In a contact opening/closing device in which the conductive contacts contact each other when the rotation operation is completed, the movable contact has a magnetic piece in its intermediate portion, and its base end is fixed to the tip of an extensible leaf spring. A contact opening/closing device characterized in that the driving means is constituted by an electromagnet device, and an attracting member of the electromagnet device is arranged to face the magnetic piece.