JPS6348916Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a vacuum circuit breaker in which a movable contact contacts and separates from a fixed contact within a vacuum valve to open and close an electric circuit.

[Conventional technology]

In conventional vacuum circuit breakers, in order to prevent the vacuum valve from being damaged by the shock generated when the movable contact collides with the fixed contact, a flexible vibration-proof rubber R is used as shown in Figure 4. A shock absorbing device formed by alternately stacking the vacuum valve and the contact plate W was provided between the vacuum valve support portion and the vacuum valve. In addition, there were also devices in which a fluorinated synthetic resin (not shown) was provided as a buffer between the vacuum valve and the vacuum valve support.

Further, the fixed contact is fixedly supported by a support portion such as a vacuum valve support portion.

[Problem to be solved by the invention] In the conventional vacuum circuit breaker as described above, the fixed contact was fixedly supported on the support part, so the impact generated when the movable contact collided with the fixed contact was Due to the recoil, the movable contact slightly vibrates,
There was a problem in that the contacts between the fixed contact and the movable contact continuously opened and closed for a certain period of time, resulting in chattering. Furthermore, since the shock absorbing device used in the vacuum valve was made of vibration-proof rubber R, backing plate W, and synthetic resin, there was a problem in that it deteriorated significantly over time due to oil, ozone, gas, and the like.

This idea was made to solve the problems mentioned above. It absorbs the collision force of the movable contact on the fixed contact, and by absorbing the impact caused by this collision, the movable contact can be moved from the fixed contact to To provide a vacuum circuit breaker which can prevent the occurrence of recoil on a contact, thereby preventing chattering, and whose shock absorption ability does not deteriorate over time.

[Means to solve the problem]

The vacuum circuit breaker according to this invention has a metal buffer device provided between a bushing provided on a terminal stud and a terminal plate supported by the terminal stud.

[Effect]

In this device, when the movable contact collides with the fixed contact, the terminal plate moves together with the fixed contact in the direction of the collision of the movable contact, which compresses the metal shock absorber in the axial direction of the fixed contact and fixes the contact. The impact of collisions received by the contacts is absorbed.

〔Example〕

Hereinafter, embodiments of this invention will be described with reference to the drawings. Fig. 1 is a sectional view taken along the - line in Fig. 2 of a vacuum circuit breaker showing an embodiment of this invention, Fig. 2 is a plan view of Fig. 1, and Fig. 3 shows the inner part of Fig. 1. FIG.

In the figure, a hollow cylindrical vacuum valve support part 2
1 has its lower end wall 21b fixed to the main body of the vacuum circuit breaker. Inside the vacuum valve support portion 21, the vacuum valve 1 is elastically supported via support devices 22 provided at four locations on each of the upper end wall 21a and the lower end wall 21b.

The support device 22 includes a vacuum valve stud 6 that is integrally implanted in the vacuum valve 1, and is fixed to the vacuum valve stud 6 by a first nut 7, and loosely penetrates the upper end wall 21a or the lower end wall 21b. the first bushing 8, the first disc spring 9 provided between the upper end wall 21a, the lower end wall 21b and the first bushing 8, and the tip of the first bushing 8 passing through the upper end wall 21a and the lower end wall 21b. A second nut 11 is screwed onto the nut 11 through a washer 10.

Four cylindrical terminal studs 12 are implanted in the upper end wall 21a alternately with support devices 22, and each of the terminal studs 12 has a small diameter at its tip. A terminal plate 16 is supported at the tip of the terminal stud 12 so as to be movable in the axial direction of the fixed contact 2 by having the tip loosely penetrate through each of four locations. A second disk spring 13 and a second bushing 14, which are metal shock absorbers, are provided at the tip of the terminal stud 12 passing through the terminal plate 16, and a third nut 15 is screwed onto the second disc spring 13 and second bushing 14, respectively. Further, the second disc spring 13 is compressively deformed in the axial direction of the fixed contact 2.

The base end of the fixed contact 2 is fixed to the terminal plate 16 with a bolt 17, and the fixed contact 2 passes through the upper end wall 21a and the vacuum valve 1, and its tip end is connected to the vacuum valve. It is coming within 1. Between the fixed contact 2 and the vacuum valve 1,
A fixed side bellows 4 is provided.

A current-carrying terminal 18 having a guide portion 19 is fixed to the lower part of the lower end wall 21b.
A sliding current-carrying portion 20 is provided inside the housing 8 .
A movable contact 3 passes through the energizing terminal 18 so as to be able to reciprocate in the vertical direction in the figure while contacting the sliding portion 20 . This movable contactor 3 passes through the lower end wall 21b and the vacuum valve 1, and its tip portion faces into the vacuum valve 1. A movable bellows 5 is provided between the movable contactor 3 and the vacuum valve 1.

In the vacuum circuit breaker configured as described above, by reciprocating the movable contact 3 in the vertical direction in the figure, its tip comes into contact with and separates from the tip of the fixed contact 2, opening and closing the electric circuit. will be held. At this time, the movable contact 3 moves at high speed to the fixed contact 2 during closing.
collide with Then, the terminal plate 16 connects to the fixed contact 2
At the same time, the second disc spring 13 is compressed.
By compressing the second disc spring 13, the impact of the collision that the fixed contactor 2 receives is absorbed. For this reason,
No reaction occurs from the fixed contact 2 to the movable contact 3, and no chattering occurs. Furthermore, since the second disc spring 13 is made of metal, it will not deteriorate over time.

In addition, in this embodiment, a second metal shock absorber is used.
Since the disc spring 13 is used, by stacking a plurality of second disc springs 13 as shown in FIG.
The gap between the bushing and the second bushing 14 can be easily adjusted, and even when this gap is short, a strong supporting force can be obtained.

Furthermore, in this embodiment, since the first disc spring 9 is also provided in the support portion 22, the shock absorbing capacity for the vacuum valve 1 does not deteriorate over time.

In addition, in the above embodiment, the second metal shock absorber is used as a metal shock absorber.
Although the disk spring 13 is used, a coil spring may also be used.

[Effect of idea]

As explained above, in the vacuum circuit breaker of this invention, a metal shock absorber for absorbing the shock caused by the collision of a movable contact with a fixed contact is provided between a bushing provided on the terminal stud and a metal shock absorber supported by the terminal stud. Since the metal shock absorber is provided between the movable contact and the fixed terminal board, this metal buffer absorbs the collision force of the movable contact on the fixed contact, and also absorbs the impact caused by this collision. There is no recoil, which prevents chattering, and also prevents the shock absorbing ability from deteriorating over time.

[Brief explanation of drawings]

Figure 1 is a sectional view taken along the - line in Figure 2 showing an embodiment of the vacuum circuit breaker of this invention;
3 is a sectional view showing the inner circle of FIG. 1, and FIG. 4 is a sectional view showing a support part of a vacuum valve from a conventional vacuum valve support part. In the figure, 2 is a fixed contact, 3 is a movable contact, 12 is a terminal stud, 13 is a second disc spring, 1
4 is a second bushing, 16 is a terminal plate, and 21 is a vacuum valve support portion. In each figure, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Scope of utility model registration request] between a bushing provided on a terminal stud fixed to a vacuum valve support and a terminal plate to which a fixed contact is fixed and supported by the terminal stud so as to be movable in the axial direction of the fixed contact. 2. A vacuum circuit breaker, characterized in that a metal shock absorber is provided for compressing and absorbing an impact caused by a collision of a movable contact with the fixed contact by the terminal plate moving together with the fixed contact.