JP2016131061A - Puffer type gas circuit breaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a puffer type gas circuit breaker with a simple structure which has improved cutoff performance.SOLUTION: A movable main contact 11 and a fixed main contact 12, as well as a movable arc contact 13 and a fixed arc contact 14 are arranged inside a filling container 2 for arc-extinguishing insulation gas. The movable arc contact 13 and the fixed arc contact 14 are surrounded by an insulation nozzle 16. The puffer type gas circuit breaker comprises: a heat puffer chamber 22 which guides, into a cylinder 21 fixing the insulation nozzle 16, the insulation gas whose pressure and temperature have been raised by the heat of arc generated in an arc space 19; and a machine puffer chamber 28 which is provided in series with the heat puffer chamber 22 and raises the pressure of the insulation gas by mechanical compression. Inside the heat puffer chamber 22, the puffer type gas circuit breaker further comprises a dividing member 26 for separating and/or stirring the flow of the insulation gas.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a puffer-type gas circuit breaker, and more particularly to a puffer-type gas circuit breaker that utilizes a mechanical compression action and / or a heating pressure increase action by arc heat.

  A conventional gas circuit breaker includes both a heat puffer chamber and a mechanical puffer chamber, and a combined type using a heating pressure increasing action and a mechanical compression action by arc heat is known. This heat puffer and mechanical puffer combined type puffer type gas circuit breaker can reduce the operation energy required for breaking operation compared to the conventional method using only mechanical compression action, and improve the breaking performance. Can do.

  In addition, the insulating gas whose temperature and pressure have been increased until the insulating gas whose temperature and pressure have been increased by the heating and pressurizing action due to the arc heat flows into the thermal puffer chamber and the insulating gas whose temperature and pressure have been increased. By sufficiently mixing, the temperature of the insulating gas blown to the arc during the interruption operation can be made relatively low.

  For example, Patent Document 1 discloses that when an insulating gas whose temperature and pressure are increased in the arc space due to the heat of the arc at the time of opening flows into the heat puffer chamber through the gas flow path, A cylindrical guide comprising a plurality of openings disposed and formed in the circumferential direction of the thermal puffer chamber from the gas flow path, or the inner surface of the insulating nozzle in contact with the gas flow path or a movable arc contact A plurality of spiral grooves formed on at least one of the outer surfaces of the cover generates a swirling flow of a high-temperature insulating gas in the heat puffer chamber and mixes it with the insulating gas in the heat puffer chamber so that the temperature is low with respect to the arc. A puffer-type gas circuit breaker that can be sprayed with an insulating gas has been proposed.

JP2013-131414A

  The gas circuit breaker that generates the swirling flow of the insulating gas described in Patent Document 1 and diffuses the high-temperature insulating gas into the puffer chamber is a cylindrical guide, an insulating nozzle, or a spiral thin groove formed in the mover cover. A swirl flow is generated by the movement of the insulating gas along. According to this means, the channel resistance of the groove increases, and the insulating gas may not be sufficiently diffused by the generated swirling flow. Further, in order to generate a swirling flow of the insulating gas, it is necessary to process a spiral groove on the inner surface of the insulating nozzle and the outer surface of the mover cover, which may increase the cost.

  The present invention is intended to solve these problems. That is, the object of the present invention is to obtain a high shut-off performance with a simple structure and an inexpensive shut-off part.

  A puffer-type gas circuit breaker according to the present invention has a pair of main contacts and a pair of arc contacts that can be contacted and separated in a container filled with an arc extinguishing insulating gas, and at least one of the arc contacts. Provided with an insulating nozzle that surrounds the arc contact, a cylindrical cylinder connected to the insulating nozzle, and a hollow rod that transmits a driving force from an operation mechanism to the shut-off portion in the cylinder. A puffer-type gas circuit breaker provided with a heat puffer chamber formed by a hollow rod, characterized by having a ring-shaped flow dividing member in the heat puffer chamber.

  According to the puffer type gas circuit breaker of the present invention, since the insulating gas diversion generating means having a small flow resistance is provided in the puffer chamber, the flow of the high temperature arc extinguishing insulating gas flowing into the puffer chamber is minimized. By separating and stirring with this resistance, the insulating gas in the puffer chamber can be sufficiently mixed, and the temperature of the insulating gas can be uniformly made relatively low. For this reason, since the temperature of the insulating gas in the puffer chamber can be uniformly lowered and blown against the arc, the blocking performance can be further improved.

It is a schematic sectional drawing which shows the puffer type gas circuit breaker which is one Example of this invention. It is a schematic sectional drawing which shows the state before the arc generation in the interruption | blocking part of the puffer type gas circuit breaker of FIG. It is a schematic sectional drawing which shows the state at the time of arc generation in the interruption | blocking part of the puffer type gas circuit breaker of FIG. It is a schematic sectional drawing which shows the state which shape | molded the flow dividing member as a part of hollow rod, or couple | bonded with the support member provided in the hollow rod. It is a schematic sectional drawing which shows the state which looked at the VV cross section in FIG. 4 from the arrow direction. 1 is a schematic cross-sectional view illustrating a flow of a high-temperature insulating gas in a heat puffer chamber when an arc is generated in a puffer type gas circuit breaker that is an embodiment of the present invention. It is a schematic sectional drawing which shows the state of the heat | fever puffer chamber when the arc is shrink | contracting in the puffer type gas circuit breaker which is one Example of this invention. It is a schematic sectional drawing which shows the state shape | molded as a part of insulation nozzle by a shunt member. It is a schematic sectional drawing which shows the state which looked at the IX-IX cross section in FIG. 8 from the arrow direction. It is a schematic sectional drawing which shows the state which shape | molded the shunt member as a part of partition, or couple | bonded with the support member provided in the partition. It is a schematic sectional drawing which shows the state which looked at the XI-XI cross section in FIG. 10 from the arrow direction. It is a schematic sectional drawing which shows the state which shape | molded the flow dividing member as a part of cylinder, or couple | bonded with the support member provided in the cylinder. It is a schematic sectional drawing which shows the state which looked at the XIII-XIII cross section in FIG. 12 from the arrow direction.

  In the puffer-type gas circuit breaker of the present invention, a movable and fixed main contact that can be contacted and separated, and a movable and fixed arc contact that can be contacted and separated are disposed inside an arc-filling insulating gas filling container. . An insulating nozzle is arranged to surround the aforementioned movable and fixed arc contacts. Further, when the movable and fixed arc contacts are separated from each other, the heat of the arc formed between the movable and fixed arc contacts in the insulating nozzle leads to an insulating gas whose pressure has increased in the arc space. A heat puffer chamber is provided, and a mechanical puffer chamber is provided in series with the heat puffer chamber and increases the pressure of the insulating gas by mechanical compression. A means for separating or stirring the flow of the insulating gas flowing into the heat puffer chamber is provided.

  Embodiments of the puffer type gas circuit breaker of the present invention will be described below with reference to the drawings. As shown in FIG. 1, a movable main contact 11 and a fixed main contact 12 that can be contacted / separated, and a movable arc contact 13 that can be contacted / separated are fixed in an arc-filling insulating gas filling container 2. An arc contact 14 is arranged.

  The movable arc contact 13 and the fixed arc contact 14 are surrounded by an insulating nozzle 16, and the insulating nozzle 16 is fixed to the tip of the cylinder 21. The outer surface of the tip of the cylinder 21 is a movable main contact 11, and the movable arc contact 13 is fixed to the tip of a hollow rod 17 disposed in the cylinder 21. The hollow rod 17 is mechanically connected to the operating mechanism 1 through the insulating rod 3, and the insulating rod 3, the hollow rod 17, the cylinder 21, the movable main contact 11, the movable arc are driven by the driving force from the operating mechanism 1. The contact 13 and the insulating nozzle 16 operate in the left-right direction on the paper surface.

  As shown in FIG. 2, the outer surface of the movable arc contact 13 is covered with a movable member cover 15, and a gas flow path 18 is formed between the inner surface of the insulating nozzle 16 and the outer surface of the movable member cover 15. The cylinder 21 is partitioned by a partition wall 24 provided with a vent hole 25 and a check valve 23.

  As shown in FIG. 3, the heat puffer chamber 22 is formed between the insulating nozzle 16 and the movable arc contact 13 and the fixed arc contact 14 when the operating mechanism 1 is opened during current application. An insulating gas whose pressure and temperature are increased by the heat of an arc (shown in black in the figure) generated in the arc space 19 is introduced. At that time, the check valve 23 is displaced toward the mechanical puffer chamber 28 due to the pressure difference between the heat puffer chamber 22 and the mechanical puffer chamber 28, and the flow path 25 is blocked. Thereafter, the insulating gas in the heat puffer chamber 22 flows from the gas flow path 18 toward the insulating nozzle 16 to extinguish the arc.

  At this time, the flow dividing member 26 separates the flow of the insulating gas flowing into the heat puffer chamber 22 so that the high-temperature insulating gas is not unevenly distributed only on the gas flow path 18 side in the heat puffer chamber 22, By disturbing the flow of the insulating gas flowing into the heat puffer chamber 22, the stirring of the insulating gas flowing into the heat puffer chamber 22 and the insulating gas existing from the beginning in the heat puffer chamber 22 is promoted.

  For example, the same material as that of the insulating nozzle 16 or the cylinder 21, the hollow rod 17, and the partition wall 24 is used for the diverting member 26. The diverting member 26 can be formed into a ring shape, and is deformed by inflow of high-temperature insulating gas. Use a material and thickness that can sufficiently withstand.

  As shown in FIGS. 4 and 5, the flow dividing member 26 is fixed by three to four support members 27 radially attached to the hollow rod 17 so that the center position of the ring coincides with the center position of the blocking portion. To be able to use for a long time. At this time, the ring diameter and cross-sectional shape of the flow dividing member 26, and the position of the flow dividing member 26 in the axial direction of the breaker are changed in accordance with the performance required of the gas circuit breaker and the structure of parts other than the flow dividing member 26. Can do.

  Next, the operation at the time of current interruption of the puffer type gas circuit breaker having the above configuration will be described. When the hollow rod 17 is driven by the operation mechanism 1, the movable arc contact 13, the insulating nozzle 16, the cylinder 21 and the like covered with the mover cover 15 are displaced toward the right side of the page, and are in an open state. At this time, an arc is generated in an arc space 19 formed between the movable arc contact 13 and the fixed arc contact 14 as shown in FIG.

  The insulating gas existing in the arc space 19 increases in temperature as the pressure rises, and flows into the heat puffer chamber 22 through the gas flow path 18 as indicated by arrows in FIG. As shown in FIG. 6, the flow of the insulating gas is separated into a turbulent flow when it collides with the flow dividing member 26 as shown in FIG. 6, and a part thereof reaches the partition wall 24 in the heat puffer chamber 22. .

  For this reason, the high-temperature insulating gas flowing into the heat puffer chamber 22 is sufficiently mixed with the low-temperature arc extinguishing gas existing in the gas space of the heat puffer chamber 22, and the internal insulating gas is uniformly at a relatively low temperature. .

  Thereafter, when the arc contracts as shown in FIG. 7, the pressure in the arc space 19 decreases, so that the arc-extinguishing gas having a relatively low temperature from the heat puffer chamber 22 passes through the gas flow path 18 as indicated by the arrow, It blows toward the arc at the tip of the insulating nozzle 16 and extinguishes the arc.

  For this reason, when configured as the above-described puffer-type gas circuit breaker, the high-temperature insulating gas and the low-temperature insulating gas are sufficiently mixed in the thermal puffer chamber 22 and uniformly become relatively low temperature. The insulation performance can be improved by spraying the insulating gas that has become low temperature on the arc.

  Next, a puffer type gas circuit breaker which is another embodiment of the present invention will be described with reference to FIGS. 8 and 9, the same parts as those in the above-described embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. Only differences from the first embodiment will be described below.

  In the puffer-type gas circuit breaker shown in FIGS. 8 and 9, the end portion of the insulating nozzle 16 is disposed so as to project inside the thermal puffer chamber 22, and the flow dividing member 26 and the support member 27 are integrally formed in the projecting portion. Compared to the above example, the number of parts in the entire blocking portion is reduced, and the assembly workability can be improved. At this time, the cross-sectional shape of the flow dividing member 26 can be changed according to the performance required for the gas circuit breaker and the structure of parts other than the flow dividing member 26.

  Further, when the flow dividing member 26 is made of the same material as that of the insulating nozzle 16, the high temperature insulating gas flowing into the heat puffer chamber 22 is mixed with the low temperature gas as in the above example and becomes relatively low temperature. In addition to the effect, the surface of the flow dividing member 26 evaporates when the flow dividing member 26 comes into contact with the high-temperature insulating gas flowing into the heat puffer chamber 22, and the gas temperature in the heat puffer chamber 22 decreases due to the evaporation heat at that time. By doing so, the same effect as the above example can be achieved.

  10 and 11 are cross-sectional views of a cutoff portion of a puffer type gas circuit breaker which is another embodiment of the present invention. 10 and 11, the same parts as those in the above-described embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. Only differences from the above embodiment will be described below.

  In the puffer-type gas circuit breaker shown in FIGS. 10 and 11, the end of the partition wall 24 is disposed so as to project inside the thermal puffer chamber 22, and the flow dividing member 26 and the support member 27 are integrally formed in the projecting portion, thereby interrupting. The number of parts in the entire part is reduced, and the assembly workability can be improved. At this time, the cross-sectional shape of the flow dividing member 26 can be changed according to the performance required for the gas circuit breaker and the structure of parts other than the flow dividing member 26.

  12 and 13 are cross-sectional views of a cutoff portion of a puffer type gas circuit breaker which is another embodiment of the present invention. 12 and 13, the same parts as those in the above-described embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. Only differences from the above embodiment will be described below.

  In the puffer type gas circuit breaker shown in FIGS. 12 and 13, the ring center position is fixed by three to four support members 27 radially attached to the cylinder 21 so as to coincide with the center position of the blocking portion. Make it available. At this time, the ring diameter and cross-sectional shape of the flow dividing member 26 and the position of the flow dividing member 26 in the axial direction of the breaker can be freely changed according to the performance required of the gas breaker and the structure of parts other than the flow diverter 26. can do.

  Further, unlike the above example, the flow of the high-temperature gas that reaches the partition wall 24 generated by the flow dividing member 26 is not hindered by the support member 27, so that the high temperature in the vicinity of the partition wall 24 in the heat puffer chamber 22 is high. Mixing of gas and low temperature gas is further promoted, and the same effect as the above example can be achieved.

  The puffer type gas circuit breaker of the present invention is not limited to the structure shown in the above-described embodiments, and can be implemented by appropriately changing the shape and configuration of each part without departing from the spirit of the present invention. . In the embodiment, a single drive type gas circuit breaker has been described as an example, but the present invention can also be applied to a double drive type gas circuit breaker.

DESCRIPTION OF SYMBOLS 1 ... Operation mechanism, 2 ... Filling container, 3 ... Insulating rod, 11 ... Movable main contact, 12 ... Fixed main contact, 13 ... Movable arc contact, 14. .... Fixed arc contact, 15 ... mover cover, 16 ... insulating nozzle, 17 ... hollow rod, 18 ... gas flow path, 19 ... arc space, 21 ... cylinder, 22 ... Heat puffer chamber, 23 ... Check valve, 24 ... Partition, 25 ... Vent, 26 ... Diverging member, 27 ... Support member, 28 ... Mechanical puffer chamber ,

Claims (5)

An insulating nozzle in which a pair of detachable main contacts and a pair of arc contacts are arranged in a container filled with an arc extinguishing insulating gas, and at least one of the arc contacts surrounds the arc contact A cylindrical cylinder is connected to the insulating nozzle, and a hollow rod that transmits a driving force from an operation mechanism to the shut-off portion is provided in the cylinder, and a heat buffer formed by the cylinder, the hollow rod, and a partition wall. A puffer-type gas circuit breaker having a chamber,
A puffer-type gas circuit breaker having a ring-shaped flow dividing member in the heat puffer chamber.   2. The puffer type gas circuit breaker according to claim 1, wherein the flow dividing member is fixed to a hollow rod in the heat puffer chamber by a support member.   2. The puffer-type gas circuit breaker according to claim 1, wherein an end portion of the insulating nozzle projects into the heat puffer chamber, and the flow dividing member is provided at the projecting portion.   2. The puffer type gas circuit breaker according to claim 1, wherein the flow dividing member is provided in the partition wall in the heat puffer chamber.   The puffer-type gas circuit breaker according to claim 1, wherein the diversion member is provided on an inner wall of the heat puffer chamber on the cylinder side.