JPS63136427A - Contact switch - 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 applied to relays, contactors, etc.

[Background wave (nei)]

In general, contact switching devices are required to take measures against contact welding due to arcs generated between contacts during opening and closing operations.

In particular, when the load includes a motor, capacitor, etc., contact welding is more likely to occur due to inrush current flowing.

By the way, by using the deflection of the leaf spring that becomes the movable contact,
Conventional hinge-type relays have a contact opening/closing device that relatively slides (wipes) the movable and fixed contacts when the contacts make contact, which not only provides a cleaning effect on the contact surface, but also destroys contact welding through the wiping action. It is expected. However, because there are limits to the amount of wiping and the wiping force, it has been difficult to shear the welded bridges on the contact surfaces.

On the other hand, there are fixed contacts and movable contacts whose surfaces are formed so as to be able to roll from one contact position to another contact position while in contact with each other, and the movable contact is fixed to the tip and the movable contact a movable contact having the other end in the direction in which the movable contact rolls; a driving means for pressing an intermediate portion of the movable contact in a direction in which the movable contact contacts the fixed contact from an open state; The movable contact is elastically supported and brought into contact with the fixed contact by the driving means, and the base end side of the movable contact is rotated using the fixed contact as a fulcrum while the movable contact and the fixed contact are in contact with each other. A contact opening/closing device equipped with a return spring has been proposed.

With this configuration, the movable contact contacts the fixed contact due to the operation of the driving means, and after that contact, the rotating contact rolls (d-ring) to a contact position different from the contact position at the time of closing, so that the contact Welding can be reliably destroyed and prevented. Moreover, since such an operation is achieved by a movable contact and a return spring, the structure is simple and easy to manufacture.

However, in this contact switching device, the weight of the movable contact is inevitably larger than that of conventional hinge-type relays, so the contact bounce time is longer, and the contact wear is increased, especially when switching lamp loads or motor loads. There were drawbacks.

[Promise of invention]

An object of the present invention is to provide a contact opening/closing device that can shorten contact bounce time and reduce contact wear.

[Disclosure of the invention]

The contact opening/closing device of the present invention includes a fixed contact and a movable contact made of pure silver whose surfaces are formed so that they can roll from one contact position to another in contact with each other, and the movable contact at the tip. a movable contact that is fixed and has the other end in the direction in which the movable contact rolls; and a drive means that presses an intermediate portion of the movable contact in a direction in which the movable contact contacts the fixed contact from an open state. , the movable contact is elastically supported, the movable contact is brought into contact with the fixed contact by the driving means, and the base of the movable contact is moved with the fixed contact as a fulcrum in a state of contact between the movable contact and the fixed contact. It is equipped with a return spring that rotates the end side.

According to the structure of the present invention, since the fixed contact and the movable contact are made of pure silver, since pure silver tends to weld, the contact bounce time can be shortened by welding in one contact bounce, and the contact bounce time can be lengthened. Contact wear over time can be reduced. Furthermore, even if welded, the weld is reliably broken when the movable contact rolls, so it has excellent welding resistance.

Embodiment An embodiment of the present invention will be described with reference to FIGS. 1 to 4. That is, this contact opening/closing device includes a fixed contact 1 and a movable contact 2 made of pure silver, and a movable contact 2 whose surfaces are formed so that they can roll from one contact position to another while in contact with each other. A movable contact 5 that is fixed to the tip 3 and has the other end in the rolling direction of the movable contact 2, and an intermediate portion 6 of the movable contact 5 in the direction in which the movable contact 2 contacts the fixed contact 1 from the open state. The movable contact 2 is elastically supported by the drive means 7 and the movable contact 5 is pressed by the drive means 7.
is brought into contact with fixed contact 1, and then movable contact 2 and fixed contact 1 are
The return spring 8 rotates the base end 4 side of the movable contact 5 using the fixed contact 1 as a fulcrum in the contact state.

This contact switching device is applied to a relay.

The surface of the movable contact 2 is spherical or cylindrical and rotatable in the rolling direction.

The fixed contact 1 is fixed to a fixed contact 10, and the end of the fixed contact 10 is used as a terminal 9.

The return spring 8 is a conductive temporary spring with a curved intermediate portion 11, and connects the terminal 12 and the base end 4 of the movable contact 5 electrically and mechanically.

The driving means 7 is an electromagnet of a relay, as shown in Fig. 2! As shown, an L-shaped yoke 17, a coil 20 wound around a coil frame 18 provided on one piece of the yoke 17,
The iron core 19 penetrated through the coil frame 18 and the other piece of the yoke 17 are hinged to each other to face the iron core 19 and form an engaging portion 24 at the tip thereof that engages with the intermediate portion 6 of the movable contact 5. A - armature 21 and armature return 5 for returning this armature 21;, π spring 2
Consists of 2. 23 is a coil terminal.

In addition, ]4 is a container stand, and 15 is a cover.

FIG. 1 fa) shows a state in which the movable contact 5 is separated by the return spring 8. tb+ in the figure is a state in which current is supplied to the coil 20 of the driving means 7 and the armature 21 is in the middle of operating, and the movable contact 5 rotates against the return spring 8.
The movable contact 2 of the movable contactor 5 is in contact with the fixed contact 1. At this time, contact bounce occurs, and when arcing occurs, welding occurs. Here, the welding force vs. cumulative probability of the proposed example in which the fixed contact 1 and the movable contact 2 are made of a silver-based alloy such as AgCd0 and this example in which they are made of pure silver is shown in Figure 3. The results shown are obtained. That is, in FIG. 3 (al is an example,
Figure 1b) is the case of the proposed example. As is clear from this result, welding occurs more easily in the example in which the fixed contact 1 and the movable contact 2 are made of pure silver. Therefore, since the contact bounce does not occur when welded, it can be seen that the contact bounce can be reduced in this embodiment.

Figure 4 also shows fixed contact 1 and movable contact 2 with respect to time.
Contact voltage Q1. The contact voltage Q3 at the time of arcing accompanying the occurrence of the arc at the time of the focused flow Q2 and bounce is shown, and T is the contact point. Contact voltage during arc due to contact bounce Q3
is shown in Figure 3 (al) for the proposed example and as shown in the same figure (bl) for the example, so it is clear that the contact bounce time H2 in this example is shorter than the contact bounce time H1 in the proposed example. be.

In addition, FIG. 1 (C1 shows a state in which the armature 21 of the driving means 7 is attracted to the iron core 19, and at this time, the movable contact 5 rotates around the fixed contact 1, and the movable contact 2 accordingly rotates around the fixed contact 1. The fixed contact 1 rolls.If welding occurs, the armature 2 when the movable contact 2 rolls the fixed contact 1.
It is surely destroyed by a rotational moment of 1.

Note that when the four currents of the coil 20 are stopped, the movable contact 5 is returned to the state shown in FIG. 1 (al) by the return spring 8, and the armature 21 is returned to its state by the armature return spring 22.

According to this embodiment, since the fixed contact 1 and the movable contact 2 are made of pure silver, since pure silver tends to weld, the contact bounce time can be shortened by welding in one contact bounce, and the contact bounce time can be reduced. It is possible to reduce the wear and tear of the contacts over a long period of time. In addition, even if welded, the weld will be surely destroyed when the movable contact 2 rolls, so
Excellent welding resistance.

〔Effect of the invention〕

According to the contact opening/closing device of the present invention, since the fixed contacts and the movable contacts are made of pure silver, since pure silver tends to weld, the contact bounce time can be shortened by welding in one contact bounce, and the contact bounce time can be reduced. It is possible to reduce the wear and tear of the contacts due to long periods of contact. Furthermore, even if welded, the weld is reliably broken when the movable contact rolls, resulting in excellent welding resistance.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram explaining the operating state of one embodiment of the present invention, Fig. 2 is a sectional view of the state applied to a relay, and Fig. 3 shows the cumulative value ratio for the welding force of the proposed example and the embodiment. The explanatory diagram shown in FIG. 4 is a characteristic diagram of the contact voltage and its current showing the contact bounce time of the proposed example and the embodiment. l...Fixed contact, 2...Movable contact, 3...Tip,
4... Proximal end, 5... Movable contact, 6... Middle part,
7... Drive means, 8... Return spring length IL, Jk= 1---■Yukigen Anzu. 2-...5T camellia point 3--one kidney 4--Kitone 5...Bonk service attendant 6-...Chu r1o 7-Jffill+dan 8--1 return spring (a) - Nominal force (9r) (a) -: 8 forces (9r) (b) Figure 3 (a) (b) Figure 4

Claims (1)

[Claims] A fixed contact and a movable contact made of pure silver whose surfaces are formed so as to be able to roll from one contact position to another while in contact with each other; a movable contact having the other end in a moving direction; a driving means for pressing an intermediate portion of the movable contact in a direction in which the movable contact contacts the fixed contact from an open state; and elastic support for the movable contact. and a return spring that causes the movable contact to come into contact with the fixed contact by the driving means, and further rotates the base end side of the movable contact using the fixed contact as a fulcrum while the movable contact and the fixed contact are in contact with each other. A contact switching device equipped with