JPH07211202A - Vacuum contactor - Google Patents

Abstract

PURPOSE:To improve a mechanical durable life of an interrupter by specifying a relation among the gap between both contacting elements in the movable side and in the fixed side, the gap between stoppers in an operational part, and an idleness in the operation direction of a joining part. CONSTITUTION:In a vacuum interrupter 5, a fixed side terminal 9 is fixed by a fixing metal fitting 3 and a sagging conductor 5 and a joining metal fitting 16 are fastened and fixed in a movable contacting element 8. The contacting element 8 and a fixed contacting element 7 are kept from each other by a gap G1. Also, a stopper 23 and a fixing metal fitting 4 are kept from each other by a gap G2 and the stopper 23 receives power P3 downward between the fixing metal fitting 4 and it by a returning spring 20. There is a step in the stopper side 23 of the joining metal fitting 16 and there is idleness G3 between the step part and the stopper 23 in the open pole state. The gaps G1, G2, and G, have a relation among them; G2> G1> (G2-G3). Consequently, since the working impact affecting the spring 20 is not transmitted to a container of the interrupter 5, the container is prevented from being damaged and the usable life of the interrupter 5 is extended.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of an operating mechanism in a vacuum contactor for instantaneous closing and closing.

[0002]

2. Description of the Related Art An example of a conventional vacuum contactor will be described with reference to FIG. The vacuum interrupter 5 and the repulsion coil 21 are fixedly supported by a support body having fixing members 3 and 4 passed between a pair of left and right insulating support frames 1 and 2, and both ends thereof being fixed. The vacuum interrupter 5 has a fixed contactor 7 and a movable contactor 8 facing the fixed contactor 7, and is provided with terminals 9 and 10, respectively, and the fixed side terminal 9 is fixedly supported by the fixing fitting 3.

The movable contactor 8 is supported by a bellows 11 and a guide 12 so as to be movable in the axial direction opposite to the fixed contactor 7. Both contactors are enclosed in a hermetically sealed container 13 and the inside is kept in vacuum. There is.

A spring receiver 14, a flexible conductor 15 and a connecting fitting 16 are fastened and fixed to the movable terminal 10, and a return spring 20 is provided between the movable end plate 11 of the vacuum interrupter and the spring receiver 14 to provide a movable contact. Fixed contact 7 to 8
A force P ₁ in the direction of pulling away from is applied.

One end of the connecting fitting 16 is the vacuum interrupter 5
The movable contactor 8 is fixed by being screwed in, and by rotating the screw, it is possible to change the distance G ₁ between the contacts when the contact is opened.

The other end of the connecting fitting 16 is pressed against the operating portion stopper 23 by the force of the return spring 20.

The repulsion coil 21 is fixedly supported by the left and right insulating support frames. The short-circuit ring 22 is a flat plate-shaped ring made of a highly conductive material such as copper. The stopper 23 and the guide 24 are fixed and held so as to be movable in the central axis direction of the repulsion coil. It is pressed against the repulsion coil by force.

A gap G ₂ is provided between the stopper 23 and the fixing member 4 in the movable axis direction of the short-circuit ring.

The operation of the conventional vacuum contactor constructed as described above will be described with reference to FIGS.

In the normal state, both the fixed and movable contacts are separated, and no current flows between the terminals. When a momentary large current flows from the external power source to the repulsion coil 21, a magnetic field is generated in the coil. At this time, a current flows in the short-circuit ring 22 in a direction that hinders the generation of the magnetic field, and a strong current is generated between the coil current and the coil current. Then, a sharp repulsive force is generated, the short-circuit ring is flipped upward in the drawing, the short-circuit ring, the stopper 23, and the guide integrally move upward, pushing up the coupling fitting 16 to move the movable contactor to the fixed contactor. Push up in the direction. When the stopper 23 hits the fixing bracket 4 (state of FIG. 5), the repulsive force is the fixing bracket 4
However, the movable contact 8 continues to rise due to the inertial force of the movable contact portion and collides with the fixed contact (state of FIG. 8). When the movement of the movable contact portion after the stopper 23 hits the fixing bracket 4 and G _3, a relationship of _{G 1 = G 2 + G 3} .

At the moment of collision, the electrodes on the fixed side and the movable side are brought into conduction, and current starts flowing.

After that, the inertial force is lost, the movable contact 8 is separated from the fixed contact 7 by the force of the return spring 20, and both return to the original open state.

An arc is generated between both contacts and a current continues to flow, but when the current approaches the zero point, insulation is rapidly restored by the strong arc ion diffusion action of the vacuum, and the current is interrupted.

The above operation is rapidly performed by the electromagnetic repulsive force, and this contactor can be repeatedly closed and closed at an extremely high speed. Therefore, it is used as a commutation switch of a circuit breaker.

The closing time can be changed by the operation stroke of the movable contactor, the magnitude of the repulsive force, and the size G ₂ of the gap between the stopper and the fixing member.

(Japanese Utility Model Laid-Open No. 58-27828)

[0017]

In the prior art described above, a part of the operation impact when the contactor is turned on is transmitted to the container of the vacuum interrupter through the return spring, and the insulating cylinder of the vacuum interrupter and the end plate are brazed. Since a large force is applied to the joint, there is a problem that the durability life of the interrupter is short.

Further, since the opening is performed only by the force of the return spring, if an attempt is made to secure a force necessary for pulling out the slight welding of the contact, the force applied to the vacuum interrupter also becomes large, and There was a problem that it would become larger.

Further, since the return spring and the spring receiver are provided on the movable contact side, the inertial mass of the movable contact portion is increased, and in the case of the contactor of this application which is applied at high speed, the impact force due to the inertial force is generated. Since the electrodes of both the movable and fixed contacts are plastically deformed to become extremely large and the gap between the contacts widens, there is a problem that the gap needs to be adjusted frequently.

Further, when adjusting the gap G ₁ of the contactor, there is a relation of G ₁ = G ₂ + G _3. Therefore, it is necessary to measure and adjust the overstroke G _3. However, the guide is pushed to fix the stopper to the metal fitting. Must be applied to the
There was also a problem that the workability was not good because it had to be done by two people or using special adjustment hires.

The object of the present invention is to reduce the impact force applied to the vacuum interrupter when the contactor is turned on to improve the mechanical durability life of the interrupter, eliminate the plastic deformation of the contactor electrode, and change the contactor gap. It is intended to provide a contactor which has a small size, can be used for a long period of time without maintenance, and can be easily adjusted.

[0022]

In order to achieve the above object, the present invention provides a return spring on the operating portion side.
The operating part and the movable contact part are connected so that they engage in both directions of closing and opening, and there is a play G between the engaging parts.
₃ is provided, and the relationship of G ₂ > G ₁ > (G ₂ −G ₃ ) is satisfied with respect to the contact gap G ₁ and the operating portion stopper gap G ₂ .

According to a second aspect of the present invention, the engaging portion on the closing side and the engaging portion on the opening side are separate parts so that the play can be adjusted.

[0024]

Since the return spring is provided on the operating portion side as described in claim 1, the impact of the operation at the time of closing is not transmitted to the container of the vacuum interrupter, and no spring bearing is required on the moving portion side, so that the moving contact portion is lightweight. Can be converted.

The connecting portion between the operating portion and the movable contact portion is engaged in both directions of closing and opening, and the play G ₃ of both engaging portions is set smaller than the gap G ₂ of the operation stopper of the operating portion. Therefore, the throwing force generated in the operating portion can be transmitted to the contact portion, the contact portion can be opened by the return spring force of the operating portion, and G ₂ > G ₁ > (G ₂ −G ₃ ). , The inertial impact of the operating portion is not transmitted to the contactor but is absorbed by the stopper.

Further, the contact gap G ₁ can be easily obtained because the relation G ₁ = G ₂ −G ₄ is obtained by measuring the gap G ₄ on the shut-off side engaging part at the time of making.

Furthermore, when the contact is opened, the play G _{4 of the} connecting portion causes the operating portion to collide with the connecting shaft to open the electrode after the operation is started, and this collision force separates the slight welding of the contact.

Since the engaging parts of the connecting portion are separate on the closing side and the opening side as in claim 2, the play G ₃ can be adjusted by adjusting either one of the engaging parts.

[0029]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG.

Fixing metal fittings 3 and 4 are passed between a pair of left and right insulating support frames 1 and 2, and a vacuum interrupter 5 and a repulsion coil 21 are supported and fixed to a support body having both ends fixed.

The vacuum interrupter 5 has the fixed side terminal 9 fixed to the fixing fitting 3, and the movable contact 8 has the flexible conductor 1
5, the connecting metal fitting 16 is fastened and fixed, and in the open state of FIG. 1, the fixed contact 7 and the movable contact 8 have a gap G ₁
Are separated from each other.

The operating portion includes a short-circuit ring 22, a stopper 23,
The guide 24, the repulsion coil 21, and the adjustment liner 25,
It is composed of a return spring 20, a guide 24 and a stopper 23 are fixed to each other by screwing with an adjusting liner 25 and a short-circuit ring 22 sandwiched therebetween, and the guide is movably fitted in a guide hole of a repulsion coil. .

A gap G is provided between the stopper 23 and the fixture 4.
₂ and the stopper 23 receives a downward force P ₃ between the stopper 23 and the fixing fitting 4 by the return spring 20.

One end of the connecting metal fitting 16 of the movable contact portion is screwed and fixed to the movable terminal of the vacuum interrupter 5, and the other end is fitted into the hole of the stopper 23 of the operation portion so as to be movable in the vertical direction in the figure, and is connected. A shaft 17 is fitted through both of them.

The connecting shaft 17 and the connecting fitting 16 are fitted without play, and the stopper 23 is provided with elongated holes 27 through which the connecting shaft penetrates on both sides of the fitting portion of the connecting fitting 16. A play G ₅ is provided between the slot 27 and the slot 27.

A step is provided on the stopper 23 side of the connecting fitting 16, and there is a play G ₃ between the step and the stopper in the open state, and the relationship with each of the gaps is G ₂ >.
G ₁ > (G ₂ −G ₃ ), G ₃ <G ₅ At this time, the connecting shaft 17 and the stopper 23 are in contact with each other above the elongated hole 27. The contact portion receives an upward force P _{2 due} to the self-closing force of the vacuum interrupter, but the stopper receives a return spring force P ₃ , and P ₃ > P ₂
Therefore, the movable contact portion maintains the contact opening state together with the operation portion.

The operation of the embodiment of the present invention thus constructed will be described with reference to FIGS.

When the repulsion coil 21 is not excited, the movable contactor 8 of the vacuum interrupter 5 is returned to the return spring 20.
It is pushed downward in the figure by the force P ₃ and the electric current does not flow between the terminals 9 and 10 of the vacuum interrupter.

When a momentary large current flows through the repulsion coil 21 from an external power supply (not shown), the short-circuit ring 22 produces an electromagnetic repulsion force P ₁ between the short-circuit ring 22 and the coil current and is repelled upward in the drawing.

Although the short-circuit ring 22, the stopper 23, and the guide 24 move upward as a unit, the connecting fitting 16
When the play G ₃ of the step portion becomes 0, it comes into contact with the operation portion stopper 23 and receives the electromagnetic repulsive force P ₁ and starts moving upward together with the movable contactor 8.

When the gap G ₂ between the stopper 23 of the operating portion and the fixed metal fitting 4 becomes 0 (state of FIG. 2), the force from the operating portion to the connecting metal fitting 16 is cut off, but the movable contact portion and the connecting portion are connected. The movable contact further rises due to the mass inertia force of the metal fitting 16 and collides with the fixed contact. At this time, a gap G ₄ is formed between the connecting shaft 17 and the upper end of the elongated hole 27 of the stopper 23.
(The state of FIG. 3).

Due to the collision, the fixed contact and the movable contact become conductive, and a current flows between the terminals 9 and 10 of the vacuum interrupter. After that, the inertia of the movable part and the operating part is lost, the operating part is returned downward by the force of the return spring 20, and when the gap G ₄ becomes 0, the mass inertial force of the operating part and the restoring force are returned to the connecting fitting 16. The spring force acts, the movable contact portion is separated from the fixed contactor, the both return to the original open state again, and the current is interrupted in a vacuum.

Next, a method of adjusting the operation stroke S and the contact gap G ₁ will be described.

Since the operation stroke S is given by S = G ₂ + G ₄ , each value is measured with a gap gauge and G ₂
Is adjusted using the adjustment liner 25, and G ₃ is the stopper 2
Adjust the liner between 3 and the fitting 16.

Since the contact gap G ₁ is given by G ₁ = G ₂ -G ₄ , each value is measured and adjusted with the screw portion of the connecting fitting 16.

[0046]

The present invention has the following effects.

(1) Since the return spring can be provided on the operating portion side and the impact of the operation of the return spring is not transmitted to the container of the vacuum interrupter, mechanical damage to the container can be prevented, and the use of the vacuum interrupter can be prevented. Since the service life can be extended and the replacement cycle can be extended, the maintenance of the contactor can be saved.

(2) By changing the spring bearing from the movable side to the operating portion side, the weight of the movable portion is reduced, so that the impact of the movable contactor can be reduced and plastic deformation of the contactor can be prevented. Since the gap variation of the contactor is reduced, the labor of adjustment can be saved, and the service life of the vacuum interrupter is extended, so that the maintenance labor of the contactor can be saved.

(3) When the contactor is opened, the collision impact force of the operating portion acts in the direction of separating the contact due to the play of the connecting portion. Therefore, if the welding is slight, the contact can be opened by itself, and the contactor can be opened. The welding resistance of can be improved.

(4) Since the bidirectional engaging portion of the connecting portion with the operating portion is made by separate parts, the adjustment can be easily performed and the adjustment at the time of new production is easy and the manufacturing cost can be reduced. It can be made low and can be used continuously by adjusting it when the engaging portion is consumed. Therefore, the life of the contactor can be extended and the running cost can be reduced.

[Brief description of drawings]

FIG. 1 is a sectional view showing an open state of an embodiment of the present invention.

FIG. 2 is a sectional view showing the middle of the closing operation of the embodiment of the present invention.

FIG. 3 is a sectional view showing a contact state according to an embodiment of the present invention.

FIG. 4 is a sectional view showing a contact opening state of a contactor according to a conventional technique.

FIG. 5 is a cross-sectional view showing the middle of the closing operation of the contactor of the related art.

FIG. 6 is a sectional view showing a contact state of a conventional contactor.

[Explanation of symbols]

1, 2 ... Insulating support frame, 3, 4 ... Fixing metal, 5 ... Vacuum interrupter, 7 ... Fixed contact, 8 ... Movable contact, 16 ... Connecting metal, 17 ... Connecting shaft, 20 ... Return spring, 21 ... Repulsion Coil, 22 ... Short-circuit ring, 23 ... Stopper, 34 ... Guide, 35 ... Adjustment liner.

Claims (2)

[Claims] 1. Two contactors facing each other are enclosed in a container, the inside of the container is kept in a vacuum, one of the two contactors is fixed to the container, and the other of the two contactors is fixed. A vacuum interrupter, which is movable in the opposite axis direction to allow the two contacts to come into contact with and separate from each other in a vacuum, and an operation unit composed of an electric coil and a short-circuit ring for the movable contact. Provided, after contacting the movable contact with the fixed contact by the electromagnetic repulsive force generated in the operating portion,
Among those that immediately open the contact with the force of the return spring, a stopper is provided on the operation part to prevent the inertial force of the operation part from being applied to the contactor, and the contact part and the operation part are separated in the process of operation. In this configuration, the return spring is provided in the operating portion, and the connecting portion between the operating portion and the movable contact is engaged in both directions with respect to the operating direction. A play G ₃ is provided on the movable portion to make it smaller than the gap G _{2 of the} stopper of the operation portion.
For the gap G ₁ between the fixed contacts, G ₂ >
A vacuum contactor characterized in that the relationship of G ₁ > (G ₂ −G ₃ ) is set. 2. The vacuum contactor according to claim 1, wherein a portion for engaging the connecting portion of the operating portion and the movable contact portion on the closing side and the opening side is a separate component.