JPS62147611A - 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 applied to relays, switches, contactors, etc.

[Background technology]

This type of contact switching device generally has a problem in that the contacts are welded due to the arc or bounce arc that occurs when the device is turned on. For this reason, there are contact materials that are based on Ag and have high melting points such as -, SnO, 1nzOz, 5nO2BiOs, etc. dispersed therein to improve arc resistance by raising the melting point. There was a device that used the deflection of a leaf spring to cause the contacts to slide (wipe) together, and at the same time to obtain a cleaning effect. However, the former has the drawbacks of increased contact resistance and temperature rise, and the latter has not yet been a sufficient measure against welding in terms of wiping distance and wiping force.

Therefore, an invention has been proposed that achieves both welding resistance and reduction and stabilization of contact resistance by using a high-melting-point arc contact and a low-resistance conductive contact to generate an arc at the arc contact (for example, Patent Application No. 12832/1983,
Utility Model No. 48-21138, Utility Model No. 49-114430
No. etc.). However, these devices have the disadvantage that the conductive contacts that do not generate 7-wires are formed in a larger size than necessary, resulting in high material costs. On the other hand, if the conductive contact is made small, there is a drawback that positioning accuracy of the contact is required and it becomes difficult to adopt a structure in which the contact slides when the contact is operated.

[Purpose of the invention]

The purpose of this invention is to reduce and stabilize contact resistance, improve welding resistance, and facilitate positioning of contacts.
It is an object of the present invention to provide a contact opening/closing device in which the contacts can be slid and the material used for the conductive contacts can be reduced.

[Disclosure of the Invention] The contact opening/closing device of the present invention includes a first contact, a second contact, and a pair of high melting point arcs provided on opposing surfaces of the first contact and the second contact. a pair of low-resistance conductive contacts having a rectangular parallelepiped shape and arranged on opposing surfaces of the first contact and the second contact so that their longitudinal directions cross each other; Drive means for bringing the pair of arc contacts into contact with each other before the pair of conductive contacts when turning on, and separating the pair of arc contacts later than the pair of conductive contacts when breaking. It is.

According to the configuration of the present invention, the driving means brings the pair of arc contacts into contact with each other before the pair of conductive contacts when turning on, and brings the pair of arc contacts into contact with the pair of conductive contacts when breaking. Since it is separated later than the above, contact resistance can be reduced and stabilized, and welding resistance can be improved. In addition, since the pair of conductive contacts are rectangular and are provided so that their longitudinal directions cross each other, the shape of the conductive contacts can be made smaller and the material cost can be reduced. Since there is no need for precision in the relative positional relationship between the contact and the second contact, the position can be easily set, and a configuration in which the arc contacts or the conductive contacts slide together by the driving means can be easily achieved. I can do it.

Embodiment A first embodiment of the present invention will be described with reference to FIGS. 1 to 5. In other words, this contact opening/closing device includes a first contact 1 and a second contact 2, and a pair of high melting point contacts provided on opposing surfaces of the first contact 1 and the second contact 2. A low-resistance low-resistance rectangular rectangular parallelepiped that is arranged on the opposing surfaces of the arc contact 9.10, the first contact l and the second contact 2, and whose longitudinal directions cross each other in a criss-cross manner. a pair of conductive contacts 11.12 and, when closed, said pair of arcing contacts 9. a driving means 3 for bringing the 1O into contact with each other before the pair of conductive contacts 11 and 12, and opening the pair of arc contacts 9 and 10 after the pair of conductive contacts 11 and 12 at the time of breaking; It is equipped with

The first contact 1 is on the movable side, and the second contact 2 is on the fixed side, and the driving means 3 controls opening and closing of the first contact 1. The arc contacts 9 and 10 are, for example, A, - as an example, and are arranged on the tip side of the first contact 1 and the second contact 2. Said conductive contacts 11.12 are for example 8g
In this embodiment, the arc contacts 9 and 10 of the first contact 1 and the second contact 2 are arranged closer to the proximal end.

Further, the longitudinal direction of the electric shock contact 11 is perpendicular to the longitudinal direction of the first contact 1, and the longitudinal direction of the conductive contact 12 is perpendicular to the longitudinal direction of the first contact 1.
coincides with the longitudinal direction.

FIG. 4 shows the relative positional relationship between the first contactor 1 and the second contactor 2. In other words, A has card 15, which will be described later, as the first card.
B indicates the distance from the position where the card 15 engages with the first contact 1 to the conductive contact 11.
The distance from the engaged position to the arc contact 9.10 is shown, d is the thickness of the arc contact 9.10 in the contact state, d
' is the gap between the conductive contacts 11.12, and d' =
It is Ad/B. That is, when d=0 at the time of turning on and cutting off, there is no gap d' between the conductive contacts 11 and 12 due to contact wear. shall be determined.

As a result, when the conductive contacts 11 and 12 are turned on.

Since no arc is generated at the time of interruption and only energization occurs, the shape of the conductive contacts 11 and 12 can be made small.

The driving means 3 includes a return spring 13, a base 14 and a card 15.
Equipped with. The return spring 13 is a plate spring bent into a wave shape, and has a hole at one end connected to the protrusion 14a of the base 14 by caulking, and a hole at the other end connected to the protrusion 1a at the base end of the first contact 1 by caulking. Then, the return spring 13 moves the first contact l to the second
is biased in the direction away from the contact 2. The card 15 engages its groove 16 with the middle part of the first contact 1 and is operated downward in FIG. 1 to close the first contact 1 to the second contact 2.

The operation will be explained. Figure 1 shows the off state;
FIG. 2 shows a state in which the card 15 is operated from the state shown in FIG. 1 to push the first contact 1 downward (indicated by the arrow). At this time, since the first contact 1 is supported by the return spring 13,
The tip of the first contact 1 on the opposite side from the return spring 13 approaches the second contact 2, and the arc contact 9 moves to the arc contact 10.
come into contact with. This is the state immediately after it is turned on. In FIG. 3, the card 15 is pushed further downward, and in FIG. 2, the base end side of the first contact 1 rotates around the contact portion of the arc contact 9, 10 as a fulcrum, and the return spring 13 is bent. As a result, the conductive contacts 11 and 12 come into contact with each other, and further, the base ends of the conductive contacts 11 and 12 rotate around the contact portions as fulcrums, causing the arc contacts 9 and 10 to separate slightly, and the return spring 13 A state in which contact pressure is applied to the conductive contacts 11 and 12,
This is the final on state. On the other hand, the OFF operation releases the pressing force applied to the card 15. That is, as the first contact 1 is moved apart by the return spring 13 from the state shown in FIG. From this state, the arc contacts 9 and 10 are separated from each other as shown in FIG.

Thus, in the closing state, the arc contacts 9, 10 are closed before the conductive contacts 11.12, and in the cut-off state, the arc contacts 9, 10 are separated after the conductive contacts 11.12. Therefore, the arc or bounce arc that occurs when turning on is always between the arc contacts 9 and 10,
Since the arc contact 9°10 has a high melting point, it has welding resistance. Further, the contact resistance is determined by the low resistance conductive contacts 11 and 12, and stability is achieved because the contact resistance is not affected by arcing.

Further, since no arc occurs in the conductive contacts 11, 12, there is no need to make them large in consideration of arc resistance, and therefore the amount of material can be reduced.

Further, in the driving means 3, as the first contactor 1 moves, the first contactor 1 moves in a direction perpendicular to the operating direction,
This causes arc contact 9. lO and conductive contacts 11.1
Since sliding (wiping) between the two members occurs, it helps to stabilize welding resistance and contact resistance, and the groove 1 of the card 15
By engaging the first contact 1 with 6, excessive movement of the first contact 1 in a direction perpendicular to the operating direction is prevented.

Furthermore, if the shape of the conductive contact 11.12 is too small, it will be difficult for the arc contact 9.10 and the conductive contact 11°12 to slide. Therefore, they can slide against each other, and the contact area can always be kept constant. Moreover, the first
Since precision is not required for the relative positional relationship between the contact 1 and the second contact 2, a margin can be taken in the design.
Positioning becomes easier.

FIG. 5 shows an example in which this contact switching device is applied to a relay. That is, 17 is the case, 17a is the base, 1
Reference numeral 8 represents a cover, and reference numeral 19 represents an electromagnet constituting the driving means 3. The electromagnet 19 has a coil 21 wound around a coil frame 20, and passes through the coil frame 20 through an iron core 22a.
A base 22 with a built-in yoke is provided on the side of the base 22, the iron core 22a and the yoke of the base 22 are integrally connected at one end, and the armature 23 is hinged at the other end of the base 22 by a hinge portion 22b. with one end facing the iron core 22a and the base 2
The other end of the return spring 24 that is locked to the locking hole 23b of the armature 23 is locked to the locking hole 23b of the armature 23,
It is biased in the direction away from a. In addition, a pair of coil terminals 25 are provided on the base 22, and the coil terminals 25 are connected to the case 1.
Pass through 7's pickpocket 7 to 26? fi G11 stones! 9 is attached to the case 17.

A base 17a is arranged above this electric power stone 19, and a terminal 29 formed integrally with the base 14 of the contact opening/closing device and a base end of the second contactor 2 are integrated into the slit 27.28 formed in the base +73. A contact switching device is supported on the base 17a through the formed terminal 30, and the base 17
The groove 32 at the tip of the card 15, which is slidably supported by the guide 17b of the armature 2, is inserted into the armature 2 from the side of the base 17a.
3, and the intermediate groove 16 is engaged with the intermediate portion of the first contact l. 33 is a stopper formed on the base 17a for turning off the first contactor 1.

When the coil 21 is energized, the armature 23 connects to the iron core 22a.
The first U! is attracted by the IA and rotates by the reciprocating spring 24, and the cart 5 engaged with the armature 23 moves. The arc contact 9.10 from J through FIG. 2 to FIG. 3 is turned on first. Also, when the coil 21 is de-energized, the armature 23 returns to the spring 2.
4, the card 15 performs a return operation, and the first contact 1 performs an OFF operation in which the arc contacts 9 and 10 are later disconnected.

A second embodiment of the present invention is shown in FIG. The contact 1 and the second contact 2 have a stepped portion 8 facing each other at their tip portion 4.5, and an arc contact 9.5 on the tip side 6 with the stepped portion 8 as a boundary.
IO is arranged, a conductive contact 11.12 is arranged on the proximal side 7 and said arcing contact 9. lO and 4-electrocontact 11.1
2 is an arc contact 9. The conductive contacts 11 and 11 and the conductive contacts 11 and 12 are arranged to be displaced in a direction perpendicular to the direction in which they are arranged.

Because of this configuration, the wear and tear generated at the arc contact 9. 1fk flies around the direction perpendicular to the opposite direction of lO, but the conductive contact 11.12
Since the stepped portion 8 acts as a barrier on the side, the scattering of consumable powder is blocked and the consumable powder does not adhere to the conductive contacts 11 and 12. Furthermore, since the arc contacts 9.10 and the conductive contacts 11.12 are misaligned in a direction perpendicular to the direction in which they are lined up, t? I
l! f! Large amount of ill can be removed, and consumable powder is 4 electrical contacts 11
．． 12 makes it even more difficult to adhere.

In addition, in this invention, the driving means 3 is not limited to the configuration of the above embodiment, but may include an arc contact 9. Comrade IO put it in first, and also the arc contact 9. It is sufficient if it is a 1&formation in which the IO comrades are later separated. Furthermore, although the driving means 3 had a configuration in which only the first contact 1 was movable, both the first contact 1 and the second contact 2 were movable, and they were driven (a configuration). Furthermore, an arc contact 9.10 is provided on the tip side of the first 19 contactor 1 and the second contactor 2,
The W electric contacts 11 and 12 may be provided at the tips of the first contact 1 and the second contact 2, and the arc contacts 9 and 10 may be driven to close first.

[Effects of the Invention] According to the contact opening/closing device of the present invention, the driving means causes the pair of arc contacts to come into contact with each other before the pair of conductive contacts when turning on, and brings the pair of arc contacts into contact with each other when cutting off. Since the conductive contacts are separated from each other later than the pair of conductive contacts, contact resistance can be reduced and stabilized, and welding resistance can be improved. Also, since the pair of conductive contacts are rectangular and are provided so that their longitudinal directions intersect with each other in a crisscross manner, yL? (ii) The shape of the contact can be made smaller, reducing the material cost, and since there is no need for accuracy in the relative positional relationship between the first contact and the second contact, position setting becomes easier. This has the advantage that it is possible to easily adopt a configuration in which the arc contacts or the conductive contacts slide against each other by the driving means.

[Brief explanation of drawings]

FIG. 1 is a side view of the first embodiment of the present invention in an off state;
Figure 2 is a side view of the state immediately after it is turned on, Figure 3 is a side view of the on state, Figure 4 is a side view showing the positional relationship between the first contact and the second contact, and Figure 5. 6 is an exploded perspective view when this contact opening/closing device is applied to a relay, and FIG. 6 is an exploded perspective view when the second embodiment is applied to a relay. 1... first contact, 2... second contact, 3...
・Driving means, 9.10... Arc contact, 11.12.
・・Conductive contact 1−・−Trench 1Ω contact vLte Fig. 3

Claims (2)

[Claims] (1) A first contact and a second contact, a pair of arc contacts with high melting points provided on opposing surfaces of the first contact and the second contact, and A pair of rectangular, low-resistance conductive contacts disposed on opposing surfaces of the second contact so that their longitudinal directions cross each other; A contact opening/closing device comprising: a drive means that brings the pair of conductive contacts into contact with each other before the pair of conductive contacts and opens the pair of arc contacts later than the pair of conductive contacts at the time of disconnection. (2) The first contact and the second contact have step portions facing each other, and the arc contact and the conductive contact are arranged separated by the step portion as a boundary, and the arc contact The contact opening/closing device according to claim 1, wherein the arc contact and the conductive contact are positioned offset in a direction perpendicular to the direction in which the arc contact and the conductive contact are lined up.