JPH0614378Y2 - Switcher type switch - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a method of extinguishing an arc generated when a fixed contact and a movable contact are opened by blowing a compressed insulating gas in a cylinder. It relates to a switcher switch.

[Conventional technology]

A conventional switcher of this kind is constructed as shown in FIGS. 3 and 4, and a bushing (2) hermetically provided on the side wall of the switch container (1) has an insulating cylinder (3). An insulative cylinder (4) is fixed via a fixed contact (5) connected to the inner conductor of the bushing (2) at one end of the cylinder (4), and the cylinder (4) At the tip of the conductive pipe-shaped piston shaft (6) that penetrates from the other end of the fixed contact (5)
A movable contactor (7) is provided to contact with and separate from the movable contactor (7).
Insulating nozzle (9) with several gas flow holes (8) outside
Are fixed together.

An insulating gas such as SF ₆ gas is filled in the container (1), and several gas vent holes (10) are formed in the peripheral wall at one end of the cylinder (4).

And the piston shaft (6)
When is moved to the right, the movable contact (7) and the nozzle (9) move to the right, the movable contact (7) contacts the fixed contact (5),
The closed state shown by the dashed line in FIG.

Further, when the piston shaft (6) is moved to the left from this closed state, the movable contact (7) is separated from the fixed contact (5).

At this time, an arc is generated between the contacts (5) and (7), but the nozzle (9) moving together with the movable contact (7) removes the insulating gas on the other end side in the cylinder (4). The compressed gas passes through the gas flow hole (8) as shown by the dashed arrow and the nozzle
Since it is blown from the opening of (9) toward the fixed contact (5),
The arc is extinguished by the arc extinguishing force of the insulating gas, and the interruption is completed.

Further, the insulating gas is passed through the gas vent hole (10) to the cylinder.
(4) It is released to the outside.

[Problems to be solved by the device]

For conventional buffer switches, use an insulating cylinder
Since the rod-shaped fixed contact (5) and the movable contact (7) at the end of the piston shaft (6) are opposed to each other in a protruding state in (4), the electric field distribution during opening is As shown by the broken line in Fig. 4, electric field concentration occurs between the tips of both contacts (5) and (7), and as a result, the insulation recovery characteristic at the time of contact opening deteriorates and the cut-off performance is reduced. It has a problem that it gets worse.

The gas released from the cylinder (4) when the contact is opened is
Ionized hot gas contributes to the extinction of the arc and is blown out toward the outer peripheral direction of the cylinder (4) from the gas vent hole (10), so that the peripheral wall of the container (1) ( If there is a ground potential of 1) ′, there is a possibility of a ground fault, and therefore the container (1) cannot be made too small, which causes a problem of increasing the size of the entire switch. There is a point.

The present invention has been made in view of such problems of the conventional technology, and the purpose thereof is to reduce the electric field between the fixed contact and the movable contact at the time of opening. The present invention aims to provide a switcher switch that can be downsized.

[Means for Solving the Problems]

A configuration of the present invention for achieving the above object will be described with reference to FIG. 1 corresponding to an embodiment.

In the switcher of the present invention, a fixed contactor (5) is arranged at one end of the cylinder (4), and the movable contactor moves back and forth in the cylinder (4) to contact and separate from the fixed contactor (5). Contact (7)
The cylinder (4) when the contacts (5), (7) are opened.
A nozzle (9) for spraying the compressed insulating gas inside toward the fixed contact (5) is integrally provided, and the insulating gas is provided on the peripheral wall of the cylinder (4) outside the fixed contact (5). A switcher switch having a gas vent hole (10) formed in the same manner as the fixed contactor (5) surrounding the fixed contactor (5) outside one end of the cylinder (4). The shield (11) is attached, and a guide surface (15) for guiding the insulating gas from the gas vent hole (10) to the other end side of the cylinder (4) is formed in the shield (11). It is a thing.

[Action]

In the buffer type switch configured as described above, when the movable contact (7) is separated from the fixed contact (5), the cylinder
Compressed insulating gas in (4) is fixed contact from nozzle (9)
The arc is blown toward (5) and the arc generated between both contacts (5) and (7) is extinguished.

At this time, the insulating gas in the cylinder (4) is released to the outside from the gas vent hole (10) located outside the fixed contact (5) on the peripheral wall of the cylinder (4), but outside the cylinder (4). Since the released gas is guided to the other end side by the guide surface (15) of the shield (11) attached to the cylinder (4), even if the peripheral wall of the switch container near the outer periphery of the cylinder (4), etc. No insulating gas is sprayed.

Further, since the shield (11) is attached at the same potential as the fixed contact (5) and surrounding the fixed contact (5), the fixed contact (5) itself has the other end in terms of electric field distribution. It does not project to the side. The electric field concentration near the fixed contact (5) is relaxed, and the electric field distribution between both contacts (5) and (7) at the time of opening is concentrated between the tips of the contacts (5) and (7). Be improved without.

〔Example〕

 An embodiment will be described with reference to FIGS. 1 and 2.

In these drawings, the same symbols as those in the conventional example indicate the same or corresponding ones, and (11) is a substantially bowl-shaped shield made of a conductive material that is supported so as to wrap around one end of the cylinder (4). , Screw part (5) ′ of fixed contact (5)
After passing through the fixing plate (12) made of elastic material, the shield (11)
The shield (11) is supported and fixed to the bushing (2) by inserting it into the center hole of the bushing (2) and screwing it into the inner conductor (2) 'of the bushing (2), and the end surface of one end of the cylinder (4) is fixed. The elasticity of the plate (12) presses against the inner bottom surface of the shield (11),
Moreover, the outer peripheral surface of the one end is elastically contacted with the O-ring (14) mounted inside the cylindrical part (13) of the shield (11), and one end of the cylinder (4) is held by the shield (11). .

The cylindrical portion (13) of the shield (11) is formed in a shape coaxial with the fixed contactor (5) in the cylinder (4) so as to surround almost the entire outer circumference of the fixed contactor (5), and On the inner peripheral surface of the part (13), a curved guide that faces the gas vent hole (10) and guides the insulating gas discharged from the gas vent hole (10) to the other end side (left side) of the cylinder (4). A surface (15) is formed.

Therefore, the insulating gas blown from the nozzle (9) when the contacts (5) and (7) are opened is directed toward the fixed contact (5) as shown by the broken line arrow in FIG. It is blown to the arc between both contacts (5) and (7), and it becomes a hot gas to release gas.
It is discharged from the cylinder (4) to the outside of the cylinder (4) along the guide surface (15).

As a result, even if the ground potential is present near the outer circumference of the cylinder (4), the ionized hot gas is not directly sprayed onto the cylinder, and the peripheral wall of the switchgear (1) is the cylinder (4). There is no risk of a ground fault even if the container (1) is close to the outer circumference, and the container (1) can be downsized, and the switch can be downsized as a whole.

On the other hand, in the shield (11) having the same potential as that of the fixed contact (5), its cylindrical portion (13) surrounds almost the entire outer circumference of the fixed contact (5), so that the electric field distribution at the time of opening is As shown by the broken line in FIG. 2, the electric field concentration near the fixed contactor (5) is relaxed, and the electric field distribution between the contactors (5) and (7) is improved to be more evenly distributed.

As a result, it is possible to improve the insulation recovery characteristics when the contact is opened,
The blocking performance is improved.

[Effect of device]

Since the present invention is configured as described above, it has the following effects.

By attaching a shield having the same potential as the fixed contact surrounding the fixed contact to the outside of one end of the cylinder, it is possible to improve the electric field concentration between the fixed contact and the movable contact when the contact is opened, It is possible to improve the insulation recovery characteristic when the contact is opened and enhance the breaking performance.

Furthermore, by forming a guide surface on the shield to guide the insulating gas released from the gas vent to the outside of the cylinder to the other end of the cylinder, the gas can be discharged to the switch container, which is at the ground potential outside the cylinder. Since the gas from the vent hole is not directly blown, a ground fault can be prevented, and the container can be downsized and the switch can be downsized.

[Brief description of drawings]

The drawings show cross-sectional views of the buffer switch, respectively.
FIGS. 2 and 3 show one embodiment of the present invention, and FIGS. 3 and 4 show a conventional example. (4) …… Cylinder, (5) …… Fixed contact, (7) …… Movable contact, (9) …… Nozzle, (10) …… Gas vent, (11) …… Shield, (15) …… Guide surface.

Claims (1)

[Scope of utility model registration request] 1. A fixed contact is arranged at one end in a cylinder,
A nozzle that blows the compressed insulating gas in the cylinder toward the fixed contact at the time of opening the contacts of the movable contact that reciprocates in the cylinder and comes in contact with and separates from the fixed contact. A buffer type switch provided integrally and having a gas vent hole for the insulating gas formed on the peripheral wall of the cylinder outside the fixed contact, wherein the fixed contact is surrounded outside one end of the cylinder. A buffer type switch having a fixed contact and a shield having the same potential as that of the fixed contact, and a guide surface for guiding the insulating gas from the gas vent hole to the other end of the cylinder.