JPS61214313A - 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 switching device used in a relay or the like.

[Foreground technology]

Conventional contact switching devices for opening and closing electric circuits have different structures depending on, for example, heavy loads that require welding resistance or load levels that require contact reliability. However, it is difficult to share the parts of various types of contact opening/closing devices, and they are manufactured individually, resulting in high costs.

[Purpose of the invention]

An object of the present invention is to provide a contact opening/closing device that can share parts and satisfy welding resistance and contact reliability at low cost.

[Disclosure of the invention]

This invention provides a fixed contact that is provided with a fixed contact at its tip and is biased in the direction in which the fixed contact faces, and a movable contact that is provided at its tip opposite to the fixed contact and whose tip is moved to zero.
a movable contact bent in a direction in which the movable contact faces outward in a range from 90 degrees to 90 degrees; It is a convex curve formed in an arc shape within a parallel cross section.

As will be described later, the closer the bending angle of the tip of the movable contact is to 0 degrees, the higher the rate of sliding in the contact state, so contact reliability can be achieved, and conversely, the closer the bending angle of the tip is to 90 degrees, the more likely the contact state is to shift. Since the rate of corrosion is high, welding resistance can be obtained. Moreover, since the only difference is the bending angle of the tip of the movable contact, a large number of parts can be shared, and costs can be reduced.

Embodiment An embodiment of the present invention will be described with reference to FIGS. 1 to 7. That is, this contact switching device has a fixed contact 1
and a movable contactor 2. The fixed contact 1 has a base end supported by a shaft 3, a tip 4 that is slightly bent, and a fixed contact 5 provided on the opposite surface of the tip 4 from the inclined side. Further, a contact pressure spring 7 is compressed and suspended between the back side of the tip portion 4 and the support portion 6 to bias the fixed contact 5 in the direction toward which it faces. Although the fixed contact 1 has a bent tip 4, the tip 4' does not have to be bent as shown in FIG. 2, which shows a modified example. The movable contact 2 only needs to be biased in the direction in which the fixed contact 5 faces.The base end 8 of the movable contact 2 is supported by a shaft 9, and the distal end 10 of the movable contact 2 shown in FIG. 1 is bent at about 45 degrees. , a movable contact 11 is provided on the surface of the tip 10 opposite to the bending direction. The movable contact 11 has a surface curved in an arc shape in the same direction as the rotating direction of the movable contact 2, and faces the fixed contact 5. In FIG. 1, (a) shows an open state, that is, a state where the circuit is off, and (
In b), the movable contact 2 rotates in the direction of the arrow and the movable contact 1
1 is in contact with the fixed contact 5, and FIG. 3(c) shows a contact pressure state in which the contact pressure spring 7 is further rotated and compressed, that is, the circuit is in an on state.

During the contact contact operation between this figure (b) and figure (C),
The movable contact 11 slides while rolling with respect to the fixed contact 5, and the ratio thereof is approximately the same. Here, transfer refers to the action of rolling without slipping, and sliding refers to the action of sliding without rolling. For this figure 1,
The one in FIGS. 3 and 4 is the tip part IO of the movable contactor 2.
is not bent, that is, it is bent at 0 degrees, and in this case, as shown in FIG.
In the process of moving from the state in which the contact is in contact with the fixed contact 5 (solid line) to the contact pressure state a (imaginary line), the movable contact 11 moves relative to the fixed contact 5 and slowly slides. Compared to Figure 1, the ratio is larger for transfers and there is less sliding.

Note that Ila indicates a contact portion between the fixed contact 5 and the movable contact 11. In other words, this operation is the case where welding resistance is most effective, and is suitable for arc jumps and heavy loads. On the other hand, in the case shown in FIG. 5, the tip 10 of the movable contact 2 is bent at 90 degrees, and the fixed contact 5 of the movable contact 11 in this case is bent at 90 degrees.
from the contact state ((b) in the same figure) to the state of contact pressure vA ((d) in the same figure).
In the movement process to )), sliding is the main movement, and transfer is slightly performed, and the ratio of sliding is larger than that of transfer, as compared with FIGS. 1 and 3. That is, since this structure constantly scrapes off the insulating film formed on the surface for sliding contact, it has good contact reliability and is suitable for loads at a level where changes in contact resistance are affected.

Here, it is well known that the sliding contact of the contacts 5.11 can improve the contact reliability of the contacts 5, 11;
It is clear from the results in the table below that the transfer contact can improve the welding resistance of the contact 5.11.The test product specifications for this experimental data are a contact pressure of 180gr and a push-in amount of the contact after contact of 3.5a.

Return force when the movable contact is released is 80gr, contact material AGC
d012%, and the load is the capacitor discharge current 100
0 A (peak value) and half wave width of 200 μs.

As is clear from this result, it can be seen that the smaller the bending angle of the movable contact in which the rolling motion is greater than the sliding motion, the higher the welding resistance is.

Further, the table below shows experimental results in which the larger the bending angle of the tip end 10 of the movable contactor 2, the higher the ratio of sliding contact at the time of contact than rolling contact. Here, the amount of sliding is defined as the absolute value of the difference between the amount of change in the contact position of the movable contact surface and the amount of change in the contact position of the fixed contact surface.

Both the length of the movable contact 2 and the fixed contact 1 are 35, and the curvature of the curved surface of the movable contact 11 is l.

An experiment was conducted on a concrete example of a crane, in which the amount of movement after contact at the time of contact was the same, but only the tip portion 10 was different.

As is clear from this result, the contact sliding amount increases as the bending angle of the tip lO approaches 90°.
As a result of the above, the bending angle of the tip 10 of the movable contact 2 is 0.
The closer the temperature is to 9"Oo, the more the rolling contact is (and the better the welding resistance is and the ability to withstand heavy loads. The closer the temperature is to 9"Oo, the more the sliding contact is, making it suitable for load levels that require contact reliability. Moreover, these characteristics are simply a movable contact (C
) This can be achieved by simply changing the bending angle of the tip 10 of 2.

6 and 7 show an embodiment in which the contact opening/closing device of FIG. 1 is applied to a hinge type relay. That is, relay 20
The housing consists of a container stand 21 and a cover 22, and the container stand 2
1 fixed contact terminal 23. Movable contact terminal 24. A coil terminal 25 is fixedly provided through the coil terminal 25. The electromagnet device 26 has a fixed iron core 27. Consisting of a coil 28 and a yoke 29,
It is attached to the instrument stand 21 with bolts 31. Movable contact 2
is attached to the armature 30 that is attracted by the electromagnetic device 26 and moves together therewith; 32 is the spring support that supports the contact pressure spring 7; 33 is the armature 30 that is tension-suspended between the yoke 29 and the armature 30; return spring, 34.35
are the lead wires on the movable side and the fixed side, respectively.

In this relay 20, when the coil 28 is not energized, the movable contact 11 is separated from the fixed contact 5 by the return spring 33, and when the coil 28 is energized, the armature 30 is attracted to the fixed iron core 27, and the movable contact 11 is separated from the fixed contact 5. rotates, the movable contact 11 contacts the fixed contact 5, and enters the on state in the same manner as in FIG. 1 above. When the coil 28 is de-energized, the attractive force of the armature 30 disappears and the return spring 33 causes the sixth
Returns to the open state shown in the figure.

In addition, in this invention, the positions of the base ends of the fixed contact 1 and the movable contact 2 are such that the movable contact contacts the fixed contact due to the rotation of the movable contact, and from that contact state, the movable contact further moves toward the fixed contact. It is assumed that the relationship is arbitrary as long as the biased fixed contact 5 retreats by rotating and moving as if pushing in, and contact pressure is applied to turn it on.

Further, although each contact 1.2 is made of a rigid material in the embodiment, it can also be made of a spring material and the contact spring can be omitted. Furthermore, instead of supporting the fixed contact 1 with the shaft 3, it may be provided so as to be movable back and forth and supported with a biasing spring. Further, in the above embodiment, the surface of the movable contact 110 is formed into a convex curve, but it may be formed on the fixed contact 5 or both.

〔Effect of the invention〕

According to this invention, by providing a movable contact at the tip of the movable contact and bending the tip in a range of 0 to 90 degrees in the opposite direction to the surface of the movable contact, welding resistance and contact reliability are improved. Since it can be adapted to different characteristics, it can be manufactured easily and inexpensively by sharing parts, and it has the advantage of being able to realize a contact opening/closing device according to the load by simply changing the degree of bending of the tip. be.

[Brief explanation of drawings]

FIG. 1 is a side view of the operating state when the tip of the movable contact according to an embodiment of the present invention is bent at about 45 degrees, FIG. 2 is a side view of a modified example of the fixed contact, and FIG. The figure is a side view when the tip of the movable contact is bent at approximately 0 degrees, Figure 4 is a side view of the operating state from the start of contact to the contact pressure state, and Figure 5 is the tip of the movable contact. FIG. 6 is a cross-sectional view of the relay to which the contact opening/closing device is applied, and FIG. 7 is an exploded perspective view thereof. DESCRIPTION OF SYMBOLS 1... Fixed contact, 2... Movable contact, 5... Fixed contact, 7... Contact pressure spring, 10... Tip part, 11...
...Movable contact Figure 3 (a) (b) (c)
(d) Figure 5 Figure 6 Figure 7 Procedural Amendment (June 6, 1985 Patent Application No. 054857, 1985 3, Relationship with the person making the amendment) Applicant 4, Agent 5゜ Voluntary correction of the date of the correction order (11 Specification, page 2, line 19, "0 degrees" is changed to "90 degrees")
``degree'', corrected. (2) On page 2, line 20 of the specification, "90 degrees" is corrected to "0 degrees." (3) On page 5, line 4 of the specification, the phrase "best in welding resistance" is corrected to "improved in welding resistance." (4) Delete "Arc jump" on page 5, line 5 of the specification. (5) The first line from the bottom of page 7 of the specification, “Movable contact (C
)" should be corrected to "movable contact". (6) Correct the code as shown in red on the attached sheet in Figure 7 of the drawings. M7 figure

Claims (1)

[Claims] A fixed contact is provided with a fixed contact at the tip and is biased in the direction in which the fixed contact faces, and a movable contact is provided at the tip opposite to the fixed contact and the tip is tilted in the range of 0 degrees to 90 degrees. and a movable contact bent in a direction in which the movable contact faces outward, the surface of at least one of the fixed contact and the movable contact being arcuate within a cross section parallel to the rotational plane of the movable contact. A contact switching device with a convex curve.