WO2012163068A1

WO2012163068A1 - Arc extinguishing chamber for circuit breaker

Info

Publication number: WO2012163068A1
Application number: PCT/CN2011/083633
Authority: WO
Inventors: 郑闽生; 吴忠; 白刚
Original assignee: 厦门华电开关有限公司
Priority date: 2011-06-01
Filing date: 2011-12-07
Publication date: 2012-12-06
Also published as: CN102306590B; CN102306590A

Abstract

An arc-extinguishing chamber for a circuit-breaker, comprising a static contact module (10), a movable contact module (12), an air cylinder (14), a piston (18), an air storage chamber (22) and a valve unit. An air-compression chamber (20) is formed between the piston (18) and the air cylinder (14). The movable contact module (12) and the air cylinder (14) are connected together. The valve unit is arranged between the air-compression chamber (20) and an air storage chamber (22). When the pressure difference between the air-compression chamber (20) and the air storage chamber (22) is higher than a predetermined value, gas from the air-compression chamber flows into the air storage chamber; when the pressure of the air storage chamber is higher than that of the air-compression chamber, gas from said air storage chamber returns to the air-compression chamber, thus constituting a process whereby the air storage chamber first stores gas for the air-compression chamber, then returns said gas to said air-compression chamber. This avoids excess of pressure occurring in the air-compression chamber when the circuit-breaker breaks open, reduces operating power required by the operating mechanism, increases the length of effective air-blowing time with respect to an arc, increases the breaking capacity of the circuit-breaker and thus product reliability, and lowers the cost of the operating mechanism.

Description

Circuit breaker arc extinguishing chamber

Technical field

The invention relates to a circuit breaker arc extinguishing chamber.

Background technique

The circuit breaker pressure-type arc extinguishing chamber completes the arc extinguishing by compressing the gas in the pressure chamber to generate an air flow. The existing circuit breaker arc extinguishing chamber comprises a static contact module, a moving contact module, a pressure cylinder and a piston, and the piston A pressure chamber is formed between the cylinder and the pressure cylinder. The movable contact module and the pressure cylinder are connected together and the movable contact module is moved relative to the piston by the pressure cylinder to change the volume of the pressure chamber. During the opening operation, the gas in the pressure chamber is compressed, and the arc combustion causes the gas to expand, so that the gas pressure in the pressure chamber rises. When the pressure of the gas in the pressure chamber rises to an optimum value (critical pressure), the arc extinguishing can achieve the best effect, as long as the pressure is maintained during the arc extinguishing process to obtain the best effect. However, this is not the case. As the gas in the compressed air chamber is continuously compressed and the energy of the arc is continuously increased, the gas pressure in the pressure chamber continues to rise, which becomes inevitable. When the pressure of the pressure cylinder reaches a high level, it will be strong. The cylinder reaction force hinders the opening movement of the circuit breaker, and even reduces the opening speed to zero. As shown in the stroke curve in the oscillogram of Fig. 1 and Fig. 2, there is obvious in the process of opening and closing of the circuit breaker. Stagnant, even rebounding.

In order to overcome this kind of cylinder reaction force, it is necessary to use a heavy-duty operating mechanism with large operation power and complicated structure, such as a hydraulic mechanism to complete the circuit breaker opening operation. However, according to the survey, hydraulic mechanisms often cause leakage problems and the price is relatively high.

In view of the above deficiencies, one of the methods commonly used at present is to discharge the pressure of the gas in the compressed air chamber in a certain manner (such as installing a pressure relief valve), which reduces the pressure in the pressure chamber, but reduces the pressure in the pressure chamber. At the same time, the gas quality in the pressure chamber is also reduced, the gas density in the nozzle is lowered, the insulation performance is lowered, the gas blowing ability in the later stage is lowered, and the gas for extinguishing the arc is wasted.

In view of the above shortcomings, the second method commonly used at present is to directly increase the remaining volume of the pressure chamber. Although this method can limit the pressure of the gas in the pressure chamber during the breaking of the large current and long arc, the short arc is broken at the small current. At the time, there is a problem that the gas pressure in the pressure chamber rises slowly and the air pressure is insufficient.

Summary of the invention

The present invention provides a circuit breaker arc extinguishing chamber that overcomes the deficiencies of the circuit breaker compressed air interrupter of the prior art.

One of the technical solutions adopted by the present invention to solve its technical problems is:

The circuit breaker arc extinguishing chamber comprises a static contact module, a movable contact module, a pressure cylinder and a piston, and a pressure chamber is formed between the piston and the pressure cylinder, the movable contact module and the pressure cylinder are connected together and the piston is pressed through the cylinder The activity can change the volume of the compressor chamber; it further includes a gas storage chamber and a valve unit, the valve unit is disposed between the pressure chamber and the gas storage chamber and: the gas in the gas chamber when the pressure difference between the pressure chamber and the gas storage chamber is higher than a preset value The gas is filled into the gas storage chamber, and when the pressure of the gas storage chamber is higher than the pressure of the gas pressure chamber, the gas in the gas storage chamber is recharged to the gas pressure chamber.

In a preferred embodiment, the air hood is fixed behind the piston, and the air hood and the piston cooperate to form a gas storage chamber.

In a preferred embodiment: the valve unit is mounted on the piston.

In a preferred embodiment, the gas storage chamber is further provided with a valve.

In a preferred embodiment, the valve unit includes a one-way valve and a valve; when the pressure difference between the pressure chamber and the air storage chamber is higher than a preset value, the one-way valve is opened, and the gas in the gas chamber is filled into the gas storage chamber; When the pressure in the air reservoir is higher than the pressure in the air chamber, the valve is opened, and the gas in the air reservoir is returned to the air chamber.

In a preferred embodiment, the static contact module includes a static main contact and a static arc contact; the movable contact module is mounted on the pressure cylinder and includes a moving main contact, a moving arc contact, and a large nozzle. And a small spout, the large spout and the small spout are connected to the pressure chamber.

In a preferred embodiment, it further includes a piston rod having a cylinder and a pull rod slidably coupled to the piston rod, the piston rod being fixed to the piston and sealed through the air hood.

The second technical solution adopted by the present invention to solve the technical problems thereof is:

The circuit breaker arc extinguishing chamber comprises a static contact module, a movable contact module, a pressure cylinder and a piston, and a pressure chamber is formed between the piston and the pressure cylinder, the movable contact module and the pressure cylinder are connected together and the piston is pressed through the cylinder The activity can change the volume of the compressor chamber; and the utility model is characterized in that it further comprises a gas storage chamber and a valve unit, the valve unit is arranged between the pressure chamber and the gas storage chamber and: the gas in the gas chamber is filled when the pressure of the pressure chamber is higher than a preset value In the gas storage chamber, when the pressure of the gas storage chamber is higher than the pressure of the gas pressure chamber, the gas in the gas storage chamber is recharged to the gas pressure chamber.

Compared with the background art, the technical solution has the following advantages:

1. When the pressure difference between the pressure chamber and the gas storage chamber is higher than a preset value (or when the pressure of the pressure chamber is higher than a preset value), the gas in the gas chamber is filled into the gas storage chamber, when the pressure in the gas storage chamber is higher than the pressure in the gas chamber The gas refilling of the gas chamber can realize the process of first storing and then backfilling the gas in the gas chamber, and the technical problems existing in the background art can be overcome, and the following technical effects are produced: a. avoiding the disconnection When the valve is opened, the air pressure chamber generates excessive air pressure to improve the breaking capacity and product reliability of the circuit breaker; b. reduce the reaction force of the air chamber that acts in the pressure chamber to hinder the opening, reduce the operating work of the operating mechanism, and reduce the operation. The cost of the mechanism; c. prolong the effective air blowing time of the arc, increase the arc blowing ability of the arc of the arc extinguishing chamber, improve the breaking capacity and product reliability of the circuit breaker; d. reduce the gas temperature in the compressed air chamber, which is beneficial to prevent heat shock Wear; e. achieve small operational work and extinguish the effect of high power arc.

2. The gas storage cover is fixed behind the piston, and the gas storage cover and the piston cooperate to form a gas storage chamber, and the layout is reasonable.

3. The valve unit is installed in the piston, and the structure is simple and the cost is low.

DRAWINGS

The invention will now be further described with reference to the accompanying drawings and embodiments.

FIG. 1 is a diagram showing a medium-arc oscillogram of a switching mode of a conventional plenum type arc extinguishing chamber in the background art, wherein: 1-stroke curve, 2-recovery voltage, 3-breaking current.

2 is a long-arc oscillogram of a switch-off mode of a conventional plenum type arc extinguishing chamber in the background art, wherein: 1-stroke curve, 2-recovery voltage, 3-break current.

FIG. 3 is a schematic structural view of an arc extinguishing chamber according to a preferred embodiment, in which the circuit breaker is in a closing position.

4 is a schematic structural view of an arc extinguishing chamber of a preferred embodiment, in which the circuit breaker is in a trip position.

detailed description

Embodiment 1, please refer to FIG. 3 and FIG. 4, a circuit breaker arc extinguishing chamber, which comprises a static contact module 10, a moving contact module 12, a pressure cylinder 14, a piston 18, a gas storage chamber 22 and a valve unit.

The static contact module 10 includes a static main contact 32 and a static arc contact 34 that are coaxially fixed together.

The moving contact module 12 includes a moving main contact 36, a moving arc contact 38, a large spout 40 and a small spout 42. In this embodiment, the movable contact module 12 and the static contact module 10 are matched, and the contact and the disconnection are controlled by relative motion. In this embodiment, the moving main contact 36 and the static main contact 32 are matched, and the moving arc contact 38 and the static arc contact 34 are matched.

The cylinder 14 has a cylinder block 50 and a pull rod 60. The cylinder block 50 includes a peripheral wall 51 and a front seat 52 disposed at the front end of the peripheral wall. The movable contact module 12 is mounted on the pressure cylinder 14, and The large spout 40 and the small spout 42 open the pressurizing chamber 20. The pull rod 60 is disposed in the cylinder block 50, and its front end is fixed to the center of the cylinder front seat 52. In the embodiment, the cylinder 50 and the tie rod 60 are integrally formed, but not limited thereto, and the cylinder portion and the tie rod portion may be manufactured and reattached as needed.

A gas hood 24 is fixed behind the piston 18, and the gas hood 24 and the piston 18 cooperate to form a gas storage chamber 22. A hollow piston rod 44 is fixed to the rear central position of the piston 18. The front end of the piston rod 44 is sealed through the gas storage cover 24, and the piston rod 44 and the gas storage cover 24 are relatively fixed.

In the present embodiment, the peripheral wall of the cylinder 14 is sealed and slidably surrounding the piston 18, so that the compressor chamber 20 is formed between the piston 18 and the cylinder 14.

The front seat and the movable contact module 12 of the pressure cylinder 14 are fixed together and the cylinder 50 and the movable contact module 12 are moved relative to the piston 18 by the pull rod 60 to change the volume of the pressure chamber 20. In this embodiment, the rear end of the pull rod 60 is sealed and slid into the hole in the piston rod 44, and is connected to the operating mechanism.

The valve unit is disposed between the compressor chamber 20 and the gas storage chamber 22. In the present embodiment, the valve unit is mounted on the piston 18. The valve unit includes a check valve 28 and a valve 30; when the pressure difference between the pressure chamber 20 and the gas storage chamber 22 is higher than a preset value, the check valve 28 is opened, the gas chamber 20 gas is filled into the gas storage chamber 22; When the pressure of the gas storage chamber 22 is higher than the pressure of the pressure chamber 20, the valve 30 is opened, and the gas storage chamber 22 gas is returned to the pressure chamber 20. In this embodiment, the setting of the preset value may be considered to maintain the pressure of the pressure chamber in the critical pressure range of 1 to 2 times during the arc extinguishing process, but not limited thereto, and those skilled in the art can select according to the selection. Select the appropriate preset value for the type and characteristics of the circuit breaker.

In the present embodiment, preferably, a valve 26 is further disposed in the gas storage chamber 22 to ensure that sufficient gas is present in the pressure chamber during the automatic reclosing of the circuit breaker.

Referring to FIG. 3 and FIG. 4, when the circuit breaker is opened, the pull rod 60 drives the movable contact module 12 and the cylinder 50 to move backward together, and the gas in the pressure chamber 20 is compressed, and the arc combustion causes the gas to expand. The gas pressure in the pressure chamber 20 rises. When the small current is interrupted, since the arc energy is small, the gas pressure rise in the pressure chamber 20 is not high, and the pressure difference between the pressure P1 of the pressure chamber 20 and the pressure P2 of the gas storage chamber 22 is insufficient to open the check valve 28, and the gas is compressed. The chamber 20 is in isolation from the air reservoir 22. When a large current is interrupted, since the arc energy is large, the gas pressure in the pressure chamber 20 rises high, and the pressure difference between the pressure P1 of the pressure chamber 20 and the pressure P2 of the gas storage chamber 22 can open the check valve 28, the check valve 28 After being opened, the gas of the pressure chamber 20 is introduced into the gas storage chamber 22, and the pressure P1 and the temperature T1 of the pressure chamber 20 start to decrease, and the pressure P2 and the temperature T2 of the gas storage chamber 22 rise, and when the pressure cylinder 14 continues to move the static arc When the contact 34 no longer blocks the large spout 40, the gas in the pressurizing chamber 20 is ejected from the spout 40 in a large amount, the pressure P1 of the pressurizing chamber 20 is lowered, and when the pressure P2 of the accumulating chamber 22 is lower, the valve 30 is opened, and the gas storage chamber 22 is opened. The gas in the medium is recharged into the pressure chamber 20, and the air blowing pressure is continued for the arcing to prolong the arcing time.

In the present embodiment, since the operating work of the mechanism is reduced, the spring operating mechanism can be used instead of the hydraulic operating mechanism, which has considerable economical efficiency.

Embodiment 2 is a circuit breaker arc extinguishing chamber having the same structure as that of Embodiment 1, and is different from Embodiment 1 in that the check valve 28 is opened when the pressure of the pressure chamber 20 is higher than a preset value.

The above is only the preferred embodiment of the present invention, and thus the scope of the present invention is not limited thereto, that is, equivalent changes and modifications made in accordance with the scope of the invention and the contents of the specification should still be covered by the present invention. Within the scope.

Industrial applicability

The circuit breaker arc extinguishing chamber of the invention is ingeniously designed with a gas storage chamber which can communicate with the pressure chamber. When the pressure difference between the pressure chamber and the gas storage chamber is higher than a preset value, the gas in the gas chamber is filled into the gas storage chamber, and when the pressure in the gas storage chamber is higher than the pressure in the gas chamber, the gas in the gas storage chamber is recharged to the gas pressure chamber to realize gas storage. The process of storing and back-compensating the gas in the chamber. Avoid excessive air pressure in the pressure chamber when the circuit breaker is opened, reduce the operating work of the operating mechanism, prolong the effective air blowing time of the arc, improve the breaking capacity and product reliability of the circuit breaker, and reduce the cost of the operating mechanism.

Claims

The circuit breaker arc extinguishing chamber comprises a static contact module (10), a movable contact module (12), a pressure cylinder (14) and a piston (18), and a pressure chamber is formed between the piston (18) and the pressure cylinder (14) (20) The movable contact module (12) and the pressure cylinder (14) are coupled together and the volume of the compression chamber (20) is changed by the movement of the pressure cylinder (14) relative to the piston (18); characterized in that it further comprises a gas storage chamber (22) and a valve unit, the valve unit is disposed between the gas pressure chamber (20) and the gas storage chamber (22) and: when the pressure difference between the pressure chamber (20) and the gas storage chamber (22) is higher than a preset At the time, the gas in the pressure chamber (20) is charged into the gas storage chamber (22), and when the pressure in the gas storage chamber (22) is higher than the pressure in the pressure chamber (20), the gas storage chamber (22) is recharged to the gas pressure chamber (20).
The circuit breaker arc extinguishing chamber according to claim 1, wherein the piston (18) is fixed with a gas storage cover (24), and the gas storage cover (24) and the piston (18) cooperate to form a gas storage chamber. (twenty two).
The circuit breaker arc extinguishing chamber according to claim 2, wherein the valve unit is mounted on the piston (18).
The circuit breaker arc extinguishing chamber according to claim 1, characterized in that the gas storage chamber (22) is further provided with a valve (26).
The circuit breaker arc extinguishing chamber according to claim 1, wherein the valve unit comprises a one-way valve (28) and a valve (30); and the pressure of the pressure chamber (20) and the gas storage chamber (22) When the difference is higher than the preset value, the check valve (28) is opened, the gas of the pressure chamber (20) is charged into the gas storage chamber (22); when the pressure of the gas storage chamber (22) is higher than the pressure of the pressure chamber (20) (the valve ( 30) Open, the gas storage chamber (22) gas is recharged into the pressure chamber (20).
The circuit breaker arc extinguishing chamber according to claim 2 or 3 or 4 or 5, wherein the static contact module (10) comprises a static main contact (32) and a static arc contact (34); The movable contact module (12) is mounted on the pressure cylinder (14) and includes a moving main contact (36), a moving arc contact (38), a large nozzle (40) and a small nozzle (42), the large The spout (40) and the small spout (42) are connected to the pressurizing chamber (20).
The circuit breaker arc extinguishing chamber according to claim 6, further comprising a piston rod (44) having a cylinder (50) and a rod (60), the rod ( 60) Slidingly coupled within the piston rod (44), the piston rod (44) is secured to the piston (18) and sealed through the hood (24).
The circuit breaker arc extinguishing chamber according to claim 6, wherein when the circuit breaker starts to open, the pull rod (60) drives the movable contact module (12) and the cylinder block (50) to move backward together, and the air chamber The gas in (20) is compressed, and the arc combustion causes the gas to expand, and the gas pressure in the pressure chamber (20) rises;

When the small current is interrupted, the gas pressure in the pressure chamber (20) does not rise due to the small arc energy, and the pressure difference between the pressure P1 of the pressure chamber (20) and the pressure P2 of the gas storage chamber (22) is insufficient to open the one-way. The valve (28), the pressure chamber (20) is in isolation from the gas storage chamber (22);

When a large current is interrupted, the gas pressure in the pressure chamber (20) rises very high due to the large arc energy, and the pressure difference between the pressure P1 of the pressure chamber (20) and the pressure P2 of the gas storage chamber (22) can open the check valve. (28), the gas of the pressure chamber (20) is introduced into the gas storage chamber (22), and the pressure P1 and the temperature T1 of the pressure chamber (20) start to decrease, and the pressure P2 and the temperature T2 of the gas storage chamber (22) rise. ;

When the pressure cylinder (14) continues to move, the static arc contact (34) no longer blocks the large nozzle (40), the gas in the pressure chamber (20) is ejected from the nozzle (40), and the pressure P1 of the compressor chamber (20) is lowered. When the pressure P2 of the gas storage chamber (22) is lower than the pressure P2, the valve (30) is opened, and the gas in the gas storage chamber (22) is recharged into the pressure chamber (20), and the air blowing pressure is continuously supplied for the blowing, and the blowing is extended. Arc time.
The circuit breaker arc extinguishing chamber comprises a static contact module (10), a movable contact module (12), a pressure cylinder (14) and a piston (18), and a pressure chamber is formed between the piston (18) and the pressure cylinder (14) (20) The movable contact module (12) and the pressure cylinder (14) are coupled together and the volume of the compression chamber (20) is changed by the movement of the pressure cylinder (14) relative to the piston (18); characterized in that it further comprises a gas storage chamber (22) and a valve unit, the valve unit is disposed between the gas pressure chamber (20) and the gas storage chamber (22) and: the gas chamber (20) is charged when the pressure of the pressure chamber (20) is higher than a preset value Into the gas storage chamber (22), when the pressure of the gas storage chamber (22) is higher than the pressure of the pressure chamber (20), the gas storage chamber (22) is gas-recharged to the pressure chamber (20).