JP5143677B2 - Puffer type gas circuit breaker - Google Patents

Description

  The present invention relates to a puffer-type gas circuit breaker, and more particularly to a puffer-type gas circuit breaker equipped with a puffer shaft suitable for discharging insulating gas that has been blown to an arc generated at the time of current interruption and has become hot.

In general, a puffer-type gas circuit breaker has a hexafluoride with good insulation performance and arc-extinguishing performance, which is composed of a stationary contact section and a movable contact section that are supported by an insulator in a metal container. An arc extinguishing insulating gas such as sulfur (SF ₆ ) is filled. A fixed-side and movable-side conductive conductors are arranged at both ends of a metal container, and a blocking portion is connected to a power transmission / transformation system via these conductive conductors.

  The stationary contact portion side of the blocking portion has a stationary main contact, a stationary arc contact, and the like. Further, the movable contact portion side of the shut-off portion includes a movable main contact that contacts and separates from the fixed main contact, a movable arc contact that contacts and separates from the fixed arc contact, a puffer cylinder, A puffer device equipped with a puffer piston that compresses the insulating gas when shut off, an insulating nozzle that blows the compressed insulating gas onto the arc of the arc contact portion, and a high-temperature insulating gas that is provided with a movable arc contact at the tip A cylindrical puffer shaft used for discharging the gas, and an insulating rod for connecting the puffer shaft and the operating device.

  The cylindrical puffer shaft is arranged at the center of the movable side conductor and the puffer device of the puffer piston and puffer cylinder, and these are configured so that they can move freely in the linear direction by the action of the insulating rod connected to the operating device. ing.

  In the puffer-type gas circuit breaker, when the current is cut off at the breaking unit, the insulating gas is compressed by the puffer device, and this is blown out to the arc generated between the arc contacts on the fixed side and the movable side to extinguish the arc. The arc-extinguishing insulating gas that is heated to a high temperature by being blown onto the arc passes through the inside of the cylindrical puffer shaft and is discharged from an exhaust hole formed at the operation side end of the puffer shaft.

  Normally, the cylindrical puffer shaft is used by being integrally formed of a metal having a high melting point, but in this case, the weight is increased and the driving operation of the blocking portion is adversely affected. For this reason, it is proposed that the cylindrical puffer shaft has a double structure with an outer metal pipe made of aluminum and an inner insulating pipe made of polytetrafluoroethylene (PTFE) (Patent Document 1). reference). With this structure, it is possible to increase the speed of the operation on the movable side of the breaker in the puffer-type gas circuit breaker.

  In addition, the cylindrical puffer shaft through which the insulating gas flows has a protective pipe inserted in order to protect the inner peripheral wall surface of the shaft from high-temperature insulating gas, and between the end surface of this protective pipe and the bottom wall surface of the shaft. A puffer-type gas circuit breaker in which an elastic member is interposed in a compressed state has also been proposed (see Patent Document 2). In this structure, when high-temperature insulating gas is discharged to the outside through the exhaust hole of the puffer shaft and the exhaust hole of the shaft of the puffer cylinder, the amount of metal foreign matter mixed in the insulating gas and released to the outside is reduced. , The blocking performance and insulation performance can be improved.

Japanese Patent Laid-Open No. 5-20987 JP-A-11-265647

  However, the puffer-type gas circuit breakers disclosed in Patent Documents 1 and 2 take measures against the inner surface of the hollow portion of the puffer shaft through which high-temperature insulating gas flows. In these cases, the exhaust hole at the end of the puffer shaft that discharges the insulating gas is exposed to a high-temperature insulating gas for a long time, but no measures are taken. For this reason, when the exhaust hole of the puffer shaft is thermally deteriorated, the insulating gas is not smoothly discharged, and the shut-off performance is lowered. In an extreme case, the entire puffer shaft must be replaced in a short time, which is not economical. There are drawbacks.

  In addition, the puffer type gas circuit breaker fixes the puffer shaft and the puffer cylinder part with screws, wedges, etc. in order to match the position of the puffer shaft exhaust hole and the puffer cylinder side exhaust flow path, and prevents the rotation between them. It is carried out. In the case of this structure, the number of parts increases and the assembling work becomes complicated. In addition, there is a possibility that the non-rotating parts may be loosened due to vibration at the time of turning on / off.

  An object of the present invention is to provide a puffer-type gas circuit breaker that can maintain a shut-off performance for a long period of time by changing the structure of a cylindrical puffer shaft that discharges through a high-temperature insulating gas, including the exhaust hole portion. is there.

The puffer-type gas circuit breaker according to the present invention includes a shut-off portion that is opened and closed by an operating device in a container filled with insulating gas, and the shut-off portion includes at least a fixed-side and a movable-side main contact and a fixed side. And a movable side arc contact, a puffer device that compresses an insulating gas by a puffer cylinder and a puffer piston, and an arc generated between the fixed side and the movable side arc contacts by the insulating gas compressed by the puffer device. When provided with an insulating nozzle to be sprayed, and a cylindrical puffer shaft that is provided at the tip of the movable side arc contactor and is arranged at the center of the axis of the puffer cylinder and discharges the insulating gas after spraying the arc through the exhaust hole The puffer shaft includes an outer pipe member provided with an exhaust hole at an operation side end, and an inner pipe member disposed and fixed inside the outer pipe member. Rannahli, the end portion of the inner pipe member, the gas discharge guide member fitting the gas guide protrusion exhaust hole of the outer pipe member is arranged, said gas discharge guide member, the operating side end of the inner pipe member It is characterized by having a flat plate portion disposed in a flat groove formed in a gas guide port portion formed in the portion and a gas guide protrusion portion fitted in the exhaust hole of the outer pipe member .

  Further preferably, the outer pipe member is made of an aluminum alloy material, the inner pipe member is made of an iron material, and the gas discharge guide member is made of an alloy of copper and tungsten.

  If a puffer-type gas circuit breaker is configured as in the present invention, a cylindrical puffer shaft is composed of an outer pipe member and an inner pipe member that is disposed and fixed inside this, and at the end of the inner pipe member, Since the gas discharge guide member for positioning the gas guide protrusion in the exhaust hole of the outer pipe member is arranged, the gas discharge guide member does not impair the exhaust of the high-temperature insulating gas and can prevent thermal deterioration of the exhaust hole. Therefore, the performance of the puffer type gas circuit breaker is not lowered and the performance can be maintained for a long time.

  In addition, the puffer shaft of the present invention does not require a fixing part for preventing rotation with respect to the puffer cylinder side, so that the assembly work can be easily performed, and the puffer shaft is only a gas discharge guide member that is affected by high-temperature insulating gas. It is economical because it can be used for a long time by replacing it.

  In the puffer-type gas circuit breaker according to the present invention, a shut-off portion that is opened and closed by an operating device is disposed in a container filled with an insulating gas, and the shut-off portion includes at least a fixed-side and movable-side main contact and a fixed side. And a movable side arc contactor, a puffer device that compresses an insulating gas by a puffer cylinder and a puffer piston, and an insulating gas compressed by the puffer device is blown against the arc generated between the fixed side and movable side arc contacts. An insulating nozzle and a cylindrical puffer shaft are disposed at the axial center of the puffer cylinder, and a movable side arc contact is provided at the tip of the puffer cylinder so that the insulating gas after spraying the arc is discharged from the exhaust hole. The puffer shaft is composed of an outer pipe member having an exhaust hole at the operation side end portion and an inner pipe member arranged and fixed inside the outer pipe member. A gas discharge guide member for fitting the gas guide protrusion to the exhaust hole is arranged.

  Hereinafter, the puffer type circuit breaker of the present invention will be described with reference to the embodiments shown in FIGS. The puffer type circuit breaker includes a metal container 1 disposed above the gantry 2 and the operation device 3 and a breaker 10 that is opened and closed by an insulating rod 4 connected to the operation device 3 and is filled with an insulating gas. Is configured.

  The blocking part 10 has a fixed-side main contact 11 and a fixed-side arc contact 12 on the fixed contact part side, and a movable-side main contact 13 that contacts and separates from the fixed side on the movable contact part side. A puffer device comprising an arc contactor 14, a puffer cylinder 15 and a puffer piston 16 that operate when shut off to compress the insulating gas, and an insulating nozzle 17 that blows the compressed insulating gas against the arc generated between the arc contacts 12 and 14. And a cylindrical puffer shaft 18 disposed at the center of the puffer cylinder 15 with a movable arc contact 7 provided at the tip.

  The puffer shaft 18 of the present invention in the puffer cylinder 15 has a double structure of an outer pipe member 19 and an inner pipe member 21 which is arranged and fixed on the inner side as shown in FIG. The outer pipe member 19 is provided with an oval exhaust hole 20 for discharging a high-temperature insulating gas at the operation side end connecting the insulating rod 4 driven by the operation device 3, and the end surface is closed. The insulating rod 4 driven by the operating device 3 is connected to the part.

  The inner pipe member 21 of the puffer shaft 18 is formed with an elliptical gas guide port 22 communicating with the exhaust hole 20 of the outer pipe member 19 at the operation side end portion, and a flat surface around the gas guide port 22 portion. A groove 24 is formed. A gas discharge guide member 23 is disposed at the gas guide port 22 portion of the inner pipe member 21 so that high-temperature insulating gas can be discharged without directly contacting the exhaust hole 20.

  A gas discharge guide member 23 in the gas guide port 22 portion of the inner pipe member 21 is disposed in a flat groove 24 formed around the gas guide port 22 portion as shown in FIG. A gas guide protrusion 23B fitted and disposed in the exhaust hole 20 portion of the pipe member 19 is provided.

  In order to combine the outer pipe member 19 and the inner pipe member 21 to integrate the puffer shaft 18, and to dispose the gas discharge guide member 23 between both ends, for example, the assembly is made by the procedure described below. .

  That is, the gas guide protrusion 23B of the gas discharge guide member 23 is fitted into each exhaust hole 20 of the outer pipe member 19 and temporarily fixed by a temporary fixing material (not shown). 4A and 4B, the inner pipe member 21 is inserted into the outer pipe member 19, the gas discharge guide member 23 is temporarily fixed to the outer pipe member 19, and the gas guide port 22 is removed. The flat plate portion 23A of the gas discharge guide member 23 is engaged with the flat groove 24 formed around the portion.

  Finally, a fixing member such as a round nut 25 is screwed onto the inner surface of the outer pipe member 19 that fixes the arc contact 14 to the tip, thereby pressing and fixing the inner pipe member 21 to fix the outer pipe member. The puffer shaft 18 is configured integrally with the puffer shaft 19.

  The gas discharge guide member 23 can discharge and guide the insulating gas satisfactorily by the gas guide protrusion 23B. Moreover, since the gas guide protrusion 23B of the gas discharge guide member 23 is fitted into the exhaust hole 20, and the flat plate portion 23A is disposed in the flat groove 24 around the gas guide port 22, the gas discharge guide member 23 is connected to both pipes. The members 19 and 21 can also serve as detents, and other fixing parts can be omitted.

  The shut-off unit 10 using the puffer shaft 18 of the present invention blows off the insulating gas compressed by the puffer device during the shut-off operation by blowing it from the insulating nozzle 17 toward the arc generated between the arc contactors 12 and 14. Make arc action.

  The insulating gas that has become hot due to the arc-extinguishing action passes through the inner pipe member 22 of the puffer shaft 18, passes through the gas guide port 22, and is fitted into the exhaust hole 20 portion of the outer pipe member 19. The gas is discharged into the container 1 from the gas guide protrusion 22A. For this reason, since the exhaust hole 20 of the outer pipe member 19 is not damaged by the high-temperature insulating gas, the puffer shaft 18 can be continuously used, and the blocking performance of the blocking unit 10 can be maintained for a long period of time.

  The outer pipe member 19 constituting the puffer shaft 18 is formed of, for example, a lightweight aluminum alloy material that does not affect the driving operation of the operating device, and the inner pipe member 22 does not deteriorate even when high-temperature insulating gas passes. It is formed with a small amount of iron. Thus, when the puffer shaft 18 has a double structure, it can maintain a mechanically and thermally excellent state and can be used stably over a long period of time.

  The gas discharge guide member 23 disposed between the outer pipe member 19 and the inner pipe member 22 is made of a heat-resistant material having a high melting point and boiling point, for example, an alloy of copper and tungsten, and the gas guide protrusion 22A is formed. The outer pipe member 19 is fitted into the exhaust hole 20 portion.

  In this way, the insulating gas that has passed through the inner pipe member 22 is guided by the gas guide protrusion 22A of the gas discharge guide member 23 and enters the container without directly contacting the exhaust hole 20 of the outer pipe member 19. Since it is discharged, thermal damage in the vicinity of the exhaust hole 20 is greatly reduced, so that the puffer shaft 18 can be used for a short period of time without impairing the shutoff performance.

It is a schematic longitudinal cross-sectional view which shows one Example of the puffer type gas circuit breaker to which this invention is applied. It is a schematic longitudinal cross-sectional view which shows the movable side part of the interruption | blocking part of FIG. It is a disassembled perspective view which shows the puffer shaft of FIG. (A) is a schematic longitudinal cross-sectional view which expands and shows the puffer shaft of FIG. 2, (b) is sectional drawing of AA of (a).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Container, 3 ... Operation device, 10 ... Blocking part, 11, 13 ... Main contact, 12, 14 ... Arc contact, 15 ... Puffer cylinder, 16 ... Puffer piston, 17 ... Insulating nozzle, 18 ... Puffer shaft, DESCRIPTION OF SYMBOLS 19 Outer pipe member, 20 ... Exhaust hole, 21 ... Inner pipe member, 22 ... Gas guide port, 23 ... Gas discharge guide member, 23A ... Flat plate part, 23B ... Gas guide protrusion part.

Claims (2)

A shut-off portion that is opened and closed by an operating device is disposed in a container filled with insulating gas, and the shut-off portion includes at least fixed-side and movable-side main contacts, fixed-side and movable-side arc contacts, and a buffer. A puffer device that compresses an insulating gas by a cylinder and a puffer piston, an insulating nozzle that blows the insulating gas compressed by the puffer device against an arc generated between the arc contacts on the fixed side and the movable side, and the movable on the tip A puffer-type gas circuit breaker comprising a cylindrical puffer shaft provided with an arc contact on the side and arranged at the center of the axis of the puffer cylinder, through which an insulating gas blown onto the arc is discharged from the exhaust hole. The shaft is composed of an outer pipe member having an exhaust hole at the operation side end, and an inner pipe member arranged and fixed inside the outer pipe member. , The end portion of the inner pipe member, the gas discharge guide member fitting the gas guide protrusion exhaust hole of the outer pipe member is arranged, said gas discharge guide member, the operation-side end portion of the inner pipe member A puffer-type gas circuit breaker comprising a flat plate portion disposed in a flat groove formed in the formed gas guide port portion and a gas guide protrusion fitted into the exhaust hole of the outer pipe member . Oite to claim 1, wherein the outer pipe member is formed of an aluminum alloy material, the inner pipe member is formed by iron, and the gas discharge guide member is characterized in that it is formed of copper and tungsten alloy puffer Shape gas circuit breaker.

Images