JPS61220220A - 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] In this type of contact switching device, countermeasures are required to prevent contact welding caused by arcs generated during closing and closing. To this end, various contact materials with improved arc resistance are being studied. These contact materials are basically based on IN (Ag), high melting point tungsten, or 5
n02. Inz03. Disperses BiQt, etc., and prevents welding by increasing the melting point.

Although this effect can be obtained, the contact resistance also increases, leading to the problem of a large temperature rise.

On the other hand, mechanically, various types of relays have been studied, such as hinge-type relays, in which both movable and fixed contacts are relatively slid (wiped) by utilizing the deflection of a leaf spring. With this method, 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 accuracy 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 this state, and in which the conductive contacts come into contact with each other when the rotation operation is completed, the fixed contact is located at an intermediate position between the arc and the conductive contact, and the tip side is It is characterized by being bent toward the side closer to the movable contact.

(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 contact 3b consisting of
are arranged in parallel so as to be located on the tip side, thereby forming a fixed contact 3. 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 1, 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. The movable contact 4 is bent at a predetermined angle θ2 at an intermediate position between the two contacts 5a and 5b so that the tip side is away from the fixed contact 1, and the arc contacts 3a and 5a The conductive contacts 3b and 5b are arranged to face each other. The predetermined angle θ2 is the angle θ1
It is desirable that these angles θl, θ
2, when the recontactors 1 and 4 are not bent as shown in Fig. 2, and the angle formed by the recontactor 1.4 immediately after the contact between the fixed and movable contacts 3°5 is 03, θ1+θ2~203 It is desirable to do so. A drive piece 6 of a drive means (not shown) for driving the movable contact 4 comes into contact with the middle part of the movable contact 4.

When the movable contact 51 is driven by the drive piece 6 of the drive means, the arc contacts 3a, 5a change from the open state.
The arc contacts 3a and 5a rotate around the base end until they reach a contact state, and after the arc contacts 3a and 5a reach a contact state, they rotate around the contact point, and when the rotation is complete, the conductive contact 3b, 5
b They are arranged so that they are in contact with each other. Specifically, base 2
The base end of a leaf spring 8, which also serves as an electric path and is curved or bent in a W-shape that can be expanded and contracted, is fixed to the movable contact terminal 7 fixed to the movable contact terminal 7, and the base end of the movable contact 4 is attached to the tip of the leaf spring 8. stick. Therefore, the movable contactor 4 is in a position where it is in an open state due to the tension force of the leaf spring 8 in normal times, that is, when it is not driven by the drive piece 6, and when it is driven by the drive piece 6. , the leaf spring 8 is compressed, and the spring force accumulated thereby acts as a contact force.

(Operation) FIG. 1(a) shows the open state. In order to change from this state to a contact state, the drive piece 6 contacts the middle part of the movable contact 4 and presses it. Therefore, the movable contactor 4 rotates around its base end, and eventually the arc contacts 3a and 5a come into contact with each other (closed state). Furthermore, the movable contact 4 to be driven
is now rotated around the contact point between the arc contacts 3a and 5a, compressing the leaf spring 8 as shown in (b). meanwhile,
The gap between the conductive contacts 3b, 5b is also reduced, and the conductive contacts 3b, 5b come into contact with each other just before the maximum displacement position of the drive piece 6.

Then, at the maximum displacement position of the driving piece 6, the arc contacts 3a and 5a are separated from each other as shown in (c), and the conductive contacts 3b and 5
Only comrades b will be in contact. Conversely, when returning from the contact state to the open state, the operations are performed in the order of (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. Also, since the fixed contact 1 is bent at a predetermined angle θ1, arc? l The pivot point when rotating around the contact point between points 3a and 5a is fixed, and it is not necessary to make both contacts rotatable as in the conventional case. The support structure of No. 4 becomes extremely simple. Further, since the arc contact and the conductive contact have a step difference in the thickness direction of the contact, consumable powder of the arc contact is less likely to accumulate on the conductive contact.

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. Further, the leaf spring 8 may be curved or bent into a C shape, an S shape, or a multi-stage 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 driving means 13 consisting of an electromagnetic device for driving a contact opening/closing device and its movable contact 4 is housed in a housing constituted by a case 1) and a cover 12. This electromagnetic device is a general one, and the yoke 14. A fixed core (not shown) forming a magnetic path in series with this, a coil 15 wound around the fixed core. Coil terminal 16
, Amathia 17. is attracted to the fixed core. return spring 18,
It consists of members such as the drive piece 6 provided at the drive end of the Amachia 17. In the contact opening/closing device, each member described above, that is, the fixed contact 1 and the movable contact terminal 7 are fixed to the case II, and the middle part of the movable contact 4 is arranged to face the drive piece 6. Then, it operates in the same manner as described above depending on the operation of the electromagnet device.

[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 support structure for the movable contact is not required. is extremely simple, and can improve both welding resistance and contact resistance stability.

[Brief explanation of the drawing]

FIG. 1 is a side view of essential parts showing one embodiment of the present invention (a>
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, 6-drive piece, 8-plate spring, 3a, 5a-
- arc contact, 3b, 5b - conductive contact. Patent applicant: Matsushita Electric Works Co., Ltd. Representative patent attorney: Takemitsu Sanko (and 2 others) “35

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 fixed contact is bent at an intermediate position between the arc and the conductive contact so that the tip side thereof approaches the movable contact. A contact opening/closing device characterized by: