JPH0743984B2 - Puffer type gas circuit breaker - Google Patents

Description

The present invention relates to a puffer-type gas circuit breaker, and more particularly to an improved configuration of a sliding portion between a drive rod for driving a puffer cylinder and a puffer piston. The present invention relates to a puffer type gas circuit breaker.

(Prior Art) In recent years, with a large capacity of a power transmission system, a breaking capacity required for a circuit breaker used in a substation or a switching station has increased, and high reliability is required. In order to increase the reliability of the circuit breaker, it is important to reduce the number of parts and simplify the structure. Therefore, the number of circuit breakers is reduced. Therefore, it is necessary to increase the breaking capacity per point of the breaker.

By the way, in the conventional general puffer type gas circuit breaker, it is necessary to increase the pressure in order to improve the breaking performance.Therefore, a large puffer puffer cylinder is moved at a high opening speed to increase the gas pressure in the puffer chamber to a high pressure. The breaking capacity can be increased by spraying on the arc. However, such a method not only increases the size of the arc extinguishing chamber, but also requires a large drive unit, which impairs the economical efficiency of manufacturing and operating the circuit breaker.

Therefore, recently, as a method of suppressing the above-mentioned economic loss and efficiently increasing the gas pressure in the puffer chamber, a method of utilizing the thermal energy of the arc has been proposed, and this thermal energy can be skillfully used. It has been found that, if this is the case, the pressure of the gas in the puffer chamber can be increased and a strong arc spray can be obtained, so that the breaking performance can be improved. That is, this method takes in the thermal energy of the arc at the beginning of the breaking operation of the puffer-type gas circuit breaker into the puffer chamber through the hollow part of the drive rod and uses it to increase the pressure rise in the puffer chamber, and at the latter stage of the breaking action. Is to use the hollow portion of the drive rod as a heat exhaust path.

However, in the puffer type gas circuit breaker adopting the above method, when the hole provided in the hollow portion of the drive rod passes through the end portion of the puffer piston, the inside of the drive rod is heated by the arc to generate high pressure gas. Therefore, the expanding flow of gas is ejected from the hole of the drive rod. Therefore, there is a concern that a sliding member (for example, Teflon) provided in a sliding portion between the drive rod that drives the puffer cylinder and the puffer piston may be invaded by the high temperature gas expansion flow. Further, the sliding member may be hooked and deformed by the hole of the drive rod, and the slidability of the sliding portion may deteriorate.

(Problems to be Solved by the Invention) As described above, in the conventional puffer type gas circuit breaker that effectively utilizes the thermal energy of the arc at the time of breaking, the sliding portion between the puffer piston and the drive rod slides. There is a problem that the sliding part is thermally damaged by the hot gas flow as well as the mobility is lowered.

Therefore, in the present invention, in the puffer type gas circuit breaker that effectively utilizes the thermal energy of the arc at the time of breaking, the sliding property of the sliding portion between the puffer piston and the drive rod is improved, and the high temperature hot gas flow is used. An object of the present invention is to provide a highly reliable puffer-type gas circuit breaker capable of preventing the occurrence of heat damage in the sliding portion.

(Means for Solving the Problems) In order to achieve the above object, in the present invention, a fixed contact portion and a movable contact portion are arranged in a container filled with an arc-extinguishing gas so as to be capable of contacting and separating. The fixed contactor is installed by compressing the arc extinguishing gas by compressing the puffer chamber consisting of the puffer piston and the puffer cylinder provided in the movable contactor at the time of shutting off or tripping. Part of the drive rod that drives the puffer cylinder is a hole in the hollow part of the drive rod that drives the puffer cylinder by spraying an arc generated between the fixed arc contactor of the movable contactor and the movable arc contactor of the movable contactor to extinguish the arc. At least one is provided, and the hollow part of the drive rod and the puffer chamber are communicated with each other through the hole at the initial stage of the shutoff operation, and the hollow part of the drive rod and the container are provided through the hole at the latter stage of the shutoff operation. The sliding member provided in the sliding portion between the puffer piston and the drive rod is cut out at the sliding portion of the hole of the driving rod, and the divided sliding member is formed. Is fixed concentrically with the outer diameter of the puffer piston in the sliding member mounting groove of the inner diameter of the puffer piston on the sliding side of the drive rod, and the check valve attached to the puffer piston is the same as the mounting direction of the sliding member. It is characterized in that it is configured to.

(Operation) In the above-mentioned puffer-type gas circuit breaker, the sliding member provided at the sliding portion between the puffer piston and the drive rod is arranged in a divided manner by cutting out the sliding portion of the hole of the drive rod. The moving member is concentrically fixed to the sliding member mounting groove of the inner diameter of the puffer piston on the sliding side of the drive rod, and the check valve attached to the puffer piston is the same as the mounting direction of the sliding member. Since the sliding member and the check valve do not overlap the hole of the drive rod, the hot hot gas flow from the hole of the drive rod does not directly reach the sliding member and the check valve. Therefore, it is possible to prevent the occurrence of heat damage at the sliding portion between the puffer piston and the drive rod.

(Example) Hereinafter, the present invention will be described with reference to an example shown in the drawings.

1 and 2 are cross-sectional views showing an example of the structure of a puffer type gas circuit breaker according to the present invention. FIG. 1 shows the puffer type gas circuit breaker in the initial state of the breaking operation, and FIG. The figures respectively show the states of the puffer type gas circuit breaker in the latter half of the breaking operation.

In FIGS. 1 and 2, reference numeral 1 denotes a fixed contactor portion, which is composed of a fixed arc contactor 4 and a fixed energization contactor 3. Reference numeral 2 denotes a movable contactor, which fixes a puffer cylinder 6, a movable arc contactor 8, a movable energizing contactor 9, and a nozzle 10 to a hollow drive rod 5. In the movable contactor portion 2, the puffer cylinder 6 forms a puffer chamber 11 with the puffer piston 7 fixed to a fixed portion (not shown). Further, in the movable contactor portion 2, the hole 5a communicating between the hollow portion 5b of the drive rod 5 and the outside thereof is provided with the hollow portion 5b of the drive rod 5 and the puffer chamber 11 at the initial stage of the blocking operation as shown in FIG. It is processed to communicate with the inside. Further, as shown in FIG. 2, this hole 5a is provided in the puffer piston 7 in the latter half of the shutoff operation.
When passing through the inner diameter end 7a of the hollow rod 5b of the drive rod 5,
And the surrounding gas space.

On the other hand, a convex portion 5c for smoothly guiding the gas flow in the axial direction to the hole 5a is provided at the rear end of the hollow portion 5b of the drive rod 5a. A check valve 15 is attached to the puffer piston 7. The check valve 15 has a structure in which it is hermetically closed during the closing operation and opened during the closing operation, and the gas flow 12 easily flows into the puffer cylinder 6 during the closing operation to reduce the load during the closing operation. ing. Furthermore, the inner diameter end of the puffer piston 7
A sliding member (for example, Teflon ring) 14 is attached to 7a,
It is configured to guide the drive rod 5 described above.

3 (a) and 3 (b) are sectional views showing a detailed configuration example of the sliding portion between the puffer piston 7 and the drive rod 5 in the puffer type gas circuit breaker of FIGS. 1 and 2 described above. It is shown. It should be noted that FIG. 3 (b) shows A in FIG. 3 (a).
FIG.

In FIGS. 3A and 3B, the end 7a of the puffer piston 7 is provided with a hole for sliding the drive rod 5 coaxially with the outer diameter of the puffer piston 7. A groove 16 for inserting a sliding member is provided in this hole, and a Teflon cut out by the hole size of the driving rod hole 5a is used as the sliding member 14b in the groove 16 and the driving rod hole 5a position is set. The check valve 15 is arranged on the upper side of the sliding member 14b, that is, at a position orthogonal to the drive rod hole 5a.

Next, using FIGS. 1, 2, and 3 (a) and (b),
The operation of the puffer type gas circuit breaker according to this embodiment will be described.

First, FIG. 1 shows the initial state of the breaking operation as described above. In this state, the arc 13 generates a large amount of heat, but since the nozzle 10 has not been sufficiently opened, it has no shutoff capability. Further, in the shut-off state shown in the figure, the hole 5a of the drive rod 5 still passes through the end 7a of the puffer piston 7, so that the drive rod hole 5a is formed in the puffer chamber.
It communicates with the inside of 11.

On the other hand, at such an early stage of shutoff, the pressure in the puffer chamber 11 does not rise so much, so that the gas expansion flow from the arc 13 flows through the hollow portion 5b of the drive rod 5 into the flow 12b.
Then, it suddenly flows into the puffer chamber 11. This gas expansion flow 12c is generated even in the conventional puffer type gas circuit breaker, but the flow 12b due to heat is very large and can effectively give heat to the gas in the puffer chamber 11. Since this adds to the original compression operation of the puffer piston 7 and the puffer cylinder 6, the pressure in the puffer chamber 11 increases.

Thereafter, the drive rod hole 5a passes through the end 7a of the puffer piston 7 and communicates with the surroundings, as shown in FIG. Therefore, the hollow portion 5b of the drive rod 5 is opened to the surrounding gas portion, and the heat from the arc 13 is radiated. In such a state, since the nozzle 10 has already been sufficiently opened, the current can be cut off. The heat taken into the puffer chamber 11 is almost evenly distributed in the puffer cylinder 6, so that the high pressure rise continues until the shut-off operation ends. Therefore, since a high-speed gas flow is blown to the arc for a long time, high breaking performance can be obtained.

On the other hand, when the drive rod hole 5a passes through the puffer piston end portion 7a, the inside of the drive rod 5 is filled with the high-pressure gas thermally expanded by the arc 13, so that the expanded flow of gas is ejected from the drive rod hole 5a. . However, in this case, in this embodiment, as shown in FIG.
b is fixed to the groove 16 of the puffer piston 7, and the drive rod hole 5
Drive rod 5 so that sliding member 14b does not hit a
Since the check valve 15 is also attached only to the upper side of the sliding member 14b, the hot gas expansion flow 12b ejected from the drive rod hole 5a directly contacts the sliding member 14b,
By not hitting the check valve 15, damage to the sliding member 14b and the check valve 15 due to high temperature hot gas can be prevented. Further, in the case of a horizontal puffer type gas circuit breaker, the puffer cylinder 6 and the drive rod 5 are subjected to their own weights, so it is desirable to mount the sliding member 14b in the vertical direction, that is, in the vertical direction.

As described above, according to the present embodiment, the gas flow heated and expanded by the arc 13 is discharged from the drive rod hole 5a, and the puffer type gas circuit breaker is configured to control the driving force during the breaking operation. 7 can prevent thermal deterioration of the sliding portion between the driving rod 5 and the driving rod 5, and eliminate the deformation of the sliding member 14b caused by the driving rod hole 5a rubbing the sliding member 14b, thereby removing the sliding portion. The mobility can be improved. Further, since the check valve 15 is also attached at a position orthogonal to the drive rod hole 5a,
It is possible to prevent thermal deterioration of parts. On the other hand, sliding member
The puffer piston 7 is used to divide and fix 14b.
The concentricity with the outer diameter becomes a problem, but since Teflon or the like is mainly used as the sliding member 14b and it is easy to cut, the sliding member
Puffer piston 7 by post-processing after fixing 14b
It is easy to obtain concentricity with the outer diameter. Therefore, the present embodiment can prevent thermal deterioration of many parts, and therefore, even if the number of processing steps is slightly increased by post-processing, great advantages can be obtained.

In the above embodiment, at least one hole may be provided in the hollow portion of the drive rod 5.

Needless to say, a material other than Teflon can be used as the sliding member.

In addition, the present invention can be variously modified and implemented within the scope of the invention.

[Effects of the Invention] As described above, according to the present invention, in the puffer-type gas circuit breaker that effectively utilizes the thermal energy of the arc at the time of interruption, the slidability of the sliding portion between the puffer piston and the drive rod is improved. It is possible to provide a puffer-type gas circuit breaker that is extremely reliable and that can prevent the occurrence of thermal damage to the sliding portion due to high-temperature hot gas flow.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 and FIG. 2 respectively show one embodiment of a puffer type gas circuit breaker according to the present invention. FIG. 1 shows a circuit breaker at the initial stage of a breaking operation of the puffer type gas circuit breaker. Second cross-sectional configuration diagram of
FIG. 3 is a cross-sectional view showing the cut-off portion of the puffer-type gas circuit breaker in the latter half of the cut-off operation, and FIG. 3 (a) is a cross-sectional view showing the detailed construction of the sliding portion between the puffer piston and the drive rod in the same embodiment. FIG. 3B is a view on arrow A in FIG. 3A. 1 ... Fixed contact part, 2 ... Movable contact part, 3 ... Fixed energizing contact part, 4 ... Fixed arc contact part, 5 ... Drive rod, 5a ... Drive rod hole, 5b ... Drive rod Hollow part, 5c
...... Convex part, 6 ...... Puffer cylinder, 7 ...... Puffer piston, 8 ...... Movable arc contactor, 9 ...... Movable current contactor, 10 ...... Nozzle, 11 ...... Puffer chamber, 12 ...... Gas flow,
12a-12c …… Hot gas flow, 13 …… Arc, 14a, 14b …… Sliding member, 15 …… Check valve, 16 …… Groove.

Claims (2)

[Claims] 1. A fixed contact part and a movable contact part are arranged in a container filled with an arc-extinguishing gas so that they can come into contact with and separate from each other, and the movable contact part is provided at the time of breaking or tripping. The arc-extinguishing gas is compressed by compressing the puffer chamber composed of the puffer piston and the puffer cylinder, and is guided to the nozzle part, and the fixed arc contact of the fixed contact part and the movable arc contact of the movable contact part are contacted. A puffer type gas circuit breaker for extinguishing an arc generated between it and a child by providing at least one hole in a hollow portion of a drive rod for driving the puffer cylinder, and the hollow portion of the drive rod in the initial stage of the breaking operation. The puffer piston communicates with the puffer chamber through the hole, and the hollow portion of the drive rod and the container communicate with each other through the hole in the latter stage of the shutoff operation. A sliding member provided at a sliding portion with the drive rod is divided into a plurality of portions by cutting out the hole sliding portion of the driving rod, and the divided sliding member is slid on the driving rod sliding side of the inner diameter of the puffer piston. A puffer-type gas, characterized in that it is concentrically secured to the moving member mounting groove concentrically with the outer diameter of the puffer piston, and that the check valve mounted on the puffer piston is arranged in the same direction as the mounting direction of the sliding member. Circuit breaker. 2. The puffer type gas circuit breaker according to claim 1, wherein Teflon is used as the sliding member.