CN104347327B - A kind of chopper - Google Patents
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- CN104347327B CN104347327B CN201410618325.6A CN201410618325A CN104347327B CN 104347327 B CN104347327 B CN 104347327B CN 201410618325 A CN201410618325 A CN 201410618325A CN 104347327 B CN104347327 B CN 104347327B
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- 125000006850 spacer group Chemical group 0.000 claims abstract description 6
- 239000012212 insulator Substances 0.000 claims description 11
- 238000003466 welding Methods 0.000 claims description 6
- 238000005516 engineering process Methods 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 11
- 238000000034 method Methods 0.000 description 10
- 229910045601 alloy Inorganic materials 0.000 description 5
- 239000000956 alloy Substances 0.000 description 5
- 239000004020 conductor Substances 0.000 description 4
- 238000007664 blowing Methods 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 229910000881 Cu alloy Inorganic materials 0.000 description 2
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- -1 manganese-copper-aluminum Chemical compound 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- 239000007858 starting material Substances 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 229910001006 Constantan Inorganic materials 0.000 description 1
- 229910000640 Fe alloy Inorganic materials 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- BIJOYKCOMBZXAE-UHFFFAOYSA-N chromium iron nickel Chemical compound [Cr].[Fe].[Ni] BIJOYKCOMBZXAE-UHFFFAOYSA-N 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
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- 238000002955 isolation Methods 0.000 description 1
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- 229910052763 palladium Inorganic materials 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H73/00—Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism
- H01H73/02—Details
- H01H73/18—Means for extinguishing or suppressing arc
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- Arc-Extinguishing Devices That Are Switches (AREA)
Abstract
一种断路器。解决了断路器的分断能力和限流性能差的问题。它包括壳体，所述的壳体内设有动触头、静触头、灭弧装置、连接板和引弧片，所述的连接板与静触头相连接，所述的引弧片和连接板之间设有隔离件，所述的灭弧装置外设有至少一个环形限流线圈，所述限流线圈的两端分别与引弧片、连接板相连接。本发明提供新的限流分断技术，在不改变壳体大小的前提下，其分断性能与触点材料无关，可迅速获得极高的电弧电压，提高断路器阻抗，使之电弧快速熄灭,从而使得断路器获得高的分断能力和限流性能。
A kind of circuit breaker. The problem of poor breaking capacity and current limiting performance of the circuit breaker is solved. It includes a housing, the housing is equipped with moving contacts, static contacts, arc extinguishing device, connection plate and arc striker, the connection plate is connected with the static contact, the arc striker and arc striker A spacer is provided between the connecting plates, and at least one annular current-limiting coil is provided outside the arc extinguishing device, and the two ends of the current-limiting coil are respectively connected with the arc striker and the connecting plate. The invention provides a new current-limiting breaking technology. Under the premise of not changing the size of the shell, its breaking performance has nothing to do with the contact material. It can quickly obtain a very high arc voltage, improve the impedance of the circuit breaker, and make the arc extinguish quickly, thereby Make the circuit breaker obtain high breaking capacity and current limiting performance.
Description
技术领域 technical field
本发明涉及一种断路器，具体涉及一种限流断路器。 The invention relates to a circuit breaker, in particular to a current-limiting circuit breaker.
背景技术 Background technique
断路器是用于保护电路及电气设备避免由过载或短路引起损坏的保护装置。当今万能式断路器或者塑壳断路器不但具有保护电路导线和电气装置的作用，而且具有短路过程中限制短路电流的重要功能。这类断路器的性能主要是分断性能和限流性能，为了提高断路器的分断能力和限流能力，应该使分断过程中产生的电弧迅速熄灭，目前采用下列方法：1动触头和静触头快速分离，拉长电弧；2电弧在引弧件的引导下、进入灭弧装置；3灭弧栅片分割电弧、形成串联短弧；4灭弧栅片使电弧冷却熄弧等。在不改变动、静触头分离距离，即利用相同断路器的外轮廓，将伴随电源容量增大的更大的短路电流切断时，如果仅利用上述的电弧伸长以及冷却，自身也存在极限。而现有采用特殊材料制造动触头和静触头，使得动静触头产生电动斥力能快速分开，不过这种方式生产成本较高，还有部分直流断路器，通过增加永磁铁来加强磁吹使电弧快速通过引弧件、进入灭弧装置从而快速熄灭电弧，但此方式因永磁铁存在极性、只能用于直流电路，而不能用于交流电路。 A circuit breaker is a protective device used to protect circuits and electrical equipment from damage caused by overload or short circuit. Today's universal circuit breaker or molded case circuit breaker not only has the function of protecting circuit wires and electrical devices, but also has the important function of limiting short-circuit current during short-circuit. The performance of this type of circuit breaker is mainly the breaking performance and current limiting performance. In order to improve the breaking capacity and current limiting capacity of the circuit breaker, the arc generated during the breaking process should be quickly extinguished. At present, the following methods are used: 1. Moving contact and static contact 2. Under the guidance of the arc starter, the arc enters the arc extinguishing device; 3. The arc extinguishing grid divides the arc to form a series short arc; 4. The arc extinguishing grid cools and extinguishes the arc. When the separation distance between the moving and static contacts is not changed, that is, the outer contour of the same circuit breaker is used to cut off the larger short-circuit current accompanying the increase of the power supply capacity, if only the above-mentioned arc elongation and cooling are used, there is a limit in itself. . However, the existing moving contacts and static contacts are made of special materials, so that the dynamic and static contacts can be separated quickly due to the electric repulsion force. However, the production cost of this method is relatively high, and there are some DC circuit breakers that strengthen the magnetic blow by adding permanent magnets. Make the arc quickly pass through the arc starter and enter the arc extinguishing device to quickly extinguish the arc. However, due to the polarity of the permanent magnet, this method can only be used in DC circuits, not AC circuits.
发明内容 Contents of the invention
为解决背景技术中断路器的分断能力和限流性能差的的问题，本发明提供一种断路器。 In order to solve the problem of poor breaking capacity and current limiting performance of the circuit breaker in the background technology, the present invention provides a circuit breaker.
本发明的技术方案是：一种断路器，包括壳体，所述的壳体内设有动触头、静触头、灭弧装置、连接板和引弧片，所述的连接板与静触头相连接，所述的引弧片和连接板之间设有隔离件，所述的灭弧装置外设有至少一个环形限流线圈，所述限流线圈的两端分别与引弧片、连接板相连接。 The technical solution of the present invention is: a circuit breaker, including a housing, the housing is provided with a moving contact, a static contact, an arc extinguishing device, a connecting plate and an arc striker, the connecting plate and the static contact connected to the head, a spacer is provided between the arc striker and the connecting plate, and at least one annular current limiting coil is arranged outside the arc extinguishing device, and the two ends of the current limiter coil are respectively connected to the arc striker, connected to the connecting plate.
作为本发明的一种改进，所述的灭弧装置外设有两个环形的限流线圈。 As an improvement of the present invention, the arc extinguishing device is externally provided with two annular current-limiting coils.
作为本发明的进一步改进，所述的限流线圈在灭弧装置外左右弯折形成波浪部。 As a further improvement of the present invention, the current limiting coil is bent left and right outside the arc extinguishing device to form a wave portion.
作为本发明的进一步改进，所述的灭弧装置与限流线圈之间设有绝缘件。 As a further improvement of the present invention, an insulator is provided between the arc extinguishing device and the current limiting coil.
作为本发明的进一步改进，所述的绝缘件上设有容置槽，所述的灭弧装置插入容置槽内。 As a further improvement of the present invention, the insulator is provided with an accommodating groove, and the arc extinguishing device is inserted into the accommodating groove.
作为本发明的进一步改进，所述的限流线圈采用电阻材料制成。 As a further improvement of the present invention, the current limiting coil is made of resistive material.
作为本发明的进一步改进，所述限流线圈通过焊接、铆接或螺纹连接与引弧片相固接。 As a further improvement of the present invention, the current-limiting coil is fixedly connected to the arc striker by welding, riveting or screwing.
作为本发明的进一步改进，所述限流线圈通过焊接、铆接或螺纹连接与连接板相固接。 As a further improvement of the present invention, the current-limiting coil is fixedly connected to the connecting plate by welding, riveting or screwing.
本发明的有益效果是，当负载侧出现短路电流时，断路器动作，动触头与静触头分离并产生电弧。当电流经电弧进入环形限流线圈，限流线圈一方面增加线路阻抗起到限流作用，另一方面限流线圈产生的磁场使电弧快速进入灭弧装置，使电弧迅速分割、冷却而熄灭，从而达到提高断路器分断能力的目的。本发明提供新的限流分断技术，在不改变壳体大小的前提下，其分断性能与触点材料无关，可迅速获得极高的电弧电压，提高断路器阻抗，使之电弧快速熄灭,从而使得断路器获得高的分断能力和限流性能。而且本发明在断路器正常工作过程中，电流通过动、静触头直接连通，此时限流线圈中无电流流通，产品不产生附加的能耗。 The beneficial effect of the invention is that when a short-circuit current occurs on the load side, the circuit breaker operates, and the moving contact is separated from the static contact to generate an arc. When the current enters the annular current-limiting coil through the arc, the current-limiting coil increases the line impedance on the one hand to limit the current. On the other hand, the magnetic field generated by the current-limiting coil makes the arc quickly enter the arc extinguishing device, so that the arc is quickly divided, cooled and extinguished. So as to achieve the purpose of improving the breaking capacity of the circuit breaker. The invention provides a new current-limiting breaking technology. Under the premise of not changing the size of the shell, its breaking performance has nothing to do with the contact material. It can quickly obtain a very high arc voltage, improve the impedance of the circuit breaker, and make the arc extinguish quickly, thereby Make the circuit breaker obtain high breaking capacity and current limiting performance. Moreover, in the normal working process of the circuit breaker of the present invention, the current is directly connected through the moving and static contacts. At this time, no current flows in the current-limiting coil, and the product does not generate additional energy consumption.
附图说明 Description of drawings
附图1为本发明实施例一的结构示意图。 Accompanying drawing 1 is the structure diagram of embodiment 1 of the present invention.
附图2为附图1内的局部结构示意图。 Accompanying drawing 2 is the partial structure schematic diagram in accompanying drawing 1.
附图3为附图2去掉动触头2后的结构示意图。 Accompanying drawing 3 is the structural diagram of drawing 2 after removing the movable contact 2.
附图4为附图3去掉绝缘件9和灭弧装置4后的结构示意图。 Accompanying drawing 4 is the structural diagram of drawing 3 after removing the insulating member 9 and the arc extinguishing device 4 .
附图5为限流线圈8的结构示意图。 Accompanying drawing 5 is the structural schematic diagram of the current limiting coil 8 .
附图6为附图2的另一种实施方式。 Accompanying drawing 6 is another embodiment of accompanying drawing 2.
附图7为附图6去掉绝缘件9后的结构示意图。 Accompanying drawing 7 is the schematic diagram of the structure after the insulating member 9 is removed in the accompanying drawing 6 .
附图8为附图6的另一种实施方式。 Accompanying drawing 8 is another embodiment of accompanying drawing 6.
附图9为本发明实施例二的结构示意图。 Accompanying drawing 9 is the structural schematic diagram of embodiment 2 of the present invention.
附图10为附图9内的局部放大结构示意图。 Accompanying drawing 10 is the partial enlarged structure diagram in accompanying drawing 9.
附图11为附图10的剖视结构示意图。 Accompanying drawing 11 is the sectional structure schematic diagram of accompanying drawing 10.
附图12为本发明实施例二引弧部分的结构示意图。 Accompanying drawing 12 is the structural schematic diagram of the arc striking part of the second embodiment of the present invention.
附图13为附图9中隔离件7的结构示意图。 Accompanying drawing 13 is the structural diagram of the spacer 7 in accompanying drawing 9.
图中，1、壳体；2、动触头；3、静触头；4、灭弧装置；5、连接板；6、引弧片；7、隔离件；8、限流线圈；81、波浪部；9、绝缘件；91、容置槽。 In the figure, 1. Shell; 2. Moving contact; 3. Static contact; 4. Arc extinguishing device; 5. Connecting plate; Wave part; 9. Insulator; 91. Accommodating tank.
具体实施方式 detailed description
下面结合附图对本发明实施例作进一步说明： Embodiments of the present invention will be further described below in conjunction with accompanying drawings:
由图1结合2-13所示，一种断路器，包括壳体1，所述的壳体1内设有动触头2、静触头3、灭弧装置4、连接板5和引弧片6，所述的连接板5与静触头3相连接，所述的引弧片6和连接板5之间设有隔离件7，具体的说，所述的隔离件其隔离、绝缘作用，避免短路时大电流产生的电动力而使得引弧片和连接板直接连通，电流不经过限流线圈，使得限流线圈不起作用。所述的灭弧装置4外设有至少一个环形限流线圈8，所述限流线圈8的两端分别与引弧片6、连接板5相连接。本发明的有益效果是，当负载侧出现短路电流时，断路器动作，动触头与静触头分离并产生电弧。当电流经电弧进入环形限流线圈，限流线圈一方面增加线路阻抗起到限流作用，另一方面限流线圈产生的磁场使电弧快速进入灭弧装置，使电弧迅速分割、冷却而熄灭，从而达到提高断路器分断能力的目的。本发明提供新的限流分断技术，在不改变壳体大小的前提下，其分断性能与触点材料无关，可迅速获得极高的电弧电压，提高断路器阻抗，使之电弧快速熄灭,从而使得断路器获得高的分断能力和限流性能。而且本发明在断路器正常工作过程中，电流通过动、静触头直接连通，此时限流线圈中无电流流通，产品不产生附加的能耗。 As shown in Figure 1 combined with 2-13, a circuit breaker includes a housing 1, and the housing 1 is provided with a moving contact 2, a static contact 3, an arc extinguishing device 4, a connecting plate 5 and an arc striker piece 6, the connecting plate 5 is connected to the static contact 3, and a spacer 7 is provided between the arc starting piece 6 and the connecting plate 5. Specifically, the spacer has the function of isolation and insulation , to avoid the electromotive force generated by the large current during short circuit, so that the arc striker and the connecting plate are directly connected, and the current does not pass through the current-limiting coil, so that the current-limiting coil does not work. The arc extinguishing device 4 is externally provided with at least one annular current-limiting coil 8 , and the two ends of the current-limiting coil 8 are respectively connected with the arc striker 6 and the connecting plate 5 . The beneficial effect of the invention is that when a short-circuit current occurs on the load side, the circuit breaker operates, and the moving contact is separated from the static contact to generate an arc. When the current enters the annular current-limiting coil through the arc, the current-limiting coil increases the line impedance on the one hand to limit the current. On the other hand, the magnetic field generated by the current-limiting coil makes the arc quickly enter the arc extinguishing device, so that the arc is quickly divided, cooled and extinguished. So as to achieve the purpose of improving the breaking capacity of the circuit breaker. The invention provides a new current-limiting breaking technology. Under the premise of not changing the size of the shell, its breaking performance has nothing to do with the contact material. It can quickly obtain a very high arc voltage, improve the impedance of the circuit breaker, and quickly extinguish the arc, thereby Make the circuit breaker obtain high breaking capacity and current limiting performance. Moreover, in the normal working process of the circuit breaker of the present invention, the current is directly connected through the moving and static contacts. At this time, there is no current flowing in the current-limiting coil, and the product does not generate additional energy consumption.
所述的灭弧装置4外设有两个环形的限流线圈8。当然在实际过程中，限流线圈8可以为一、二、三、四或者更多个，在第一绝缘板上也可以缠绕多圈限流线圈，使得产品的阻抗增加，提高产品的限流效果。 The arc extinguishing device 4 is externally provided with two annular current limiting coils 8 . Of course, in the actual process, the current-limiting coil 8 can be one, two, three, four or more, and multiple turns of the current-limiting coil can also be wound on the first insulating plate, so that the impedance of the product increases and the current limiting of the product is improved. Effect.
实施例一：参考附图1-8，所述的限流线圈8在灭弧装置4外左右弯折形成波浪部81。这样的结构增大了限流线圈的电阻，从而保证了断路器的限流能力，实施例一为塑壳断路器。具体的说，所述的灭弧装置4与限流线圈8之间设有绝缘件9。绝缘件的设置避免壳体内各部件被电弧短接，影响产品性能。更具体的说，绝缘件采用绝缘产气材料制成。这样可以通过绝缘件产生气体的压差和磁吹效应更快速的引弧，提高产品的分断能力。更具体的说，所述的绝缘件9上设有容置槽91，所述的灭弧装置4插入容置槽91内。这样的结构便于灭弧装置的安装，同时减小了壳体内的空间，避免电弧外泄。 Embodiment 1: Referring to the accompanying drawings 1-8, the current limiting coil 8 is bent left and right outside the arc extinguishing device 4 to form a wave portion 81 . Such a structure increases the resistance of the current-limiting coil, thereby ensuring the current-limiting capability of the circuit breaker. Embodiment 1 is a molded case circuit breaker. Specifically, an insulator 9 is provided between the arc extinguishing device 4 and the current limiting coil 8 . The setting of the insulator prevents the parts in the shell from being short-circuited by the arc, which affects the performance of the product. More specifically, the insulating member is made of an insulating gas-generating material. In this way, the pressure difference of the gas generated by the insulating part and the magnetic blowing effect can be used to strike the arc more quickly and improve the breaking capacity of the product. More specifically, the insulator 9 is provided with an accommodating groove 91 , and the arc extinguishing device 4 is inserted into the accommodating groove 91 . Such a structure facilitates the installation of the arc extinguishing device, and at the same time reduces the space in the housing to avoid leakage of the arc.
所述的限流线圈8采用电阻材料制成。具体的说，所述的电阻材料采用铜及铜合金、锰铜合金、康铜（锰铜铝）合金、镍铬铁合金、铁铬铝合金、铂基合金、钯基合金、金基合金、银基合金、钢和各种合金钢等材料制成。采用具有导电材料且具有一定的电阻制成限流线圈。这样使得限流线圈能产生较大的磁场的同时，也能由于较大的电阻对流经限流线圈的电流进行消耗，保证产品的分断能力和限流性能。。 The current limiting coil 8 is made of resistive material. Specifically, the resistance material is copper and copper alloy, manganin-copper alloy, constantan (manganese-copper-aluminum) alloy, nickel-chromium-iron alloy, iron-chromium-aluminum alloy, platinum-based alloy, palladium-based alloy, gold-based alloy, silver Base alloy, steel and various alloy steel and other materials. The current-limiting coil is made of conductive material and has a certain resistance. In this way, the current-limiting coil can generate a large magnetic field, and at the same time consume the current flowing through the current-limiting coil due to the large resistance, so as to ensure the breaking capacity and current-limiting performance of the product. .
所述限流线圈8通过焊接、铆接或螺纹连接与引弧片6相固接。所述限流线圈8通过焊接、铆接或螺纹连接与连接板5相固接。这样的结构便于限流线圈的固定。 The current limiting coil 8 is fixedly connected to the arc striker 6 by welding, riveting or screwing. The current-limiting coil 8 is fixedly connected to the connecting plate 5 by welding, riveting or screwing. Such a structure facilitates the fixing of the current limiting coil.
实施例一：参考附图1-8，对电弧产生、熄灭过程进行说明：当负载侧出现短路电流时，断路器动作，动触头与静触头分离并产生电弧、这时电路电流由静触头3经电弧、动触头、断路器内部导体、断路器端子流向负载，通过磁吹作用以及电弧与绝缘件接触产生蒸气在电弧前后形成压力差使电弧向引弧片6快速移动，当电弧一端弧根移至引弧片6，电路电流由连接板、静触头经限流线圈8、引弧件6、电弧、动触头、断路器内部导体、端子流向负载，此时限流线圈一方面增加线路阻抗起到限流作用、另一方面限流线圈产生磁场使电弧快速向灭弧装置方向移动。当电弧进入灭弧装置内、电弧被栅片分割和冷却使电弧电压快速上升，绝缘件在电弧高温作用下产生蒸气和栅片使电弧充分冷却致熄灭，即完成了电路短路断开。 Embodiment 1: Referring to the accompanying drawings 1-8, the process of arc generation and extinguishment is explained: when a short-circuit current occurs on the load side, the circuit breaker operates, and the moving contact is separated from the static contact to generate an arc. The contact 3 flows to the load through the arc, the moving contact, the internal conductor of the circuit breaker, and the terminal of the circuit breaker. The steam generated by the magnetic blowing action and the contact between the arc and the insulator forms a pressure difference before and after the arc to make the arc move quickly to the arc striker 6. When the arc The arc root at one end moves to the arc striker 6, and the circuit current flows from the connection plate, the static contact through the current limiting coil 8, the arc striker 6, the arc, the moving contact, the internal conductor of the circuit breaker, and the terminal to the load. At this time, the current limiter coil 1 On the one hand, increasing the line impedance plays the role of current limiting; on the other hand, the current limiting coil generates a magnetic field to make the arc move quickly to the direction of the arc extinguishing device. When the arc enters the arc extinguishing device, the arc is divided and cooled by the grid, so that the arc voltage rises rapidly, and the insulator generates steam and the grid under the high temperature of the arc, so that the arc is fully cooled and extinguished, that is, the circuit is short-circuited.
实施二：实施例二为万能式断路器，参考附图9-13对电弧产生、熄灭过程进行说明：当负载侧出现短路电流时，断路器动作，动触头与静触头分离并产生电弧、这时电路电流由静触头经电弧、动触头、铜编织线、母线流向负载，通过磁吹作用使电弧向引弧片快速移动，当电弧一端弧根移至引弧片，电路电流由静触头、连接板、限流线圈、引弧片、经电弧、动接触件、断路器内部导体、母线流向负载，此时限流线圈一方面增加线路阻抗起到限流作用、另一方面限流线圈产生磁场使电弧快速向灭弧装置方向移动。当电弧进入灭弧装置内、电弧被栅片分割和冷却使电弧电压快速上升，栅片使电弧充分冷却致熄灭，即完成了电路断开。 Implementation 2: Embodiment 2 is a universal circuit breaker. Refer to the accompanying drawings 9-13 to explain the arc generation and extinguishment process: when a short-circuit current occurs on the load side, the circuit breaker operates, and the moving contact is separated from the static contact to generate an arc. , At this time, the circuit current flows from the static contact to the load through the arc, moving contact, copper braided wire, and busbar, and the arc moves quickly to the arc striker through the action of magnetic blowing. When the arc root at one end of the arc moves to the arc striker, the circuit current From the static contact, the connecting plate, the current limiting coil, the arc strike piece, through the arc, the moving contact, the internal conductor of the circuit breaker, and the bus to the load, the current limiting coil increases the line impedance on the one hand to limit the current, on the other hand The current limiting coil generates a magnetic field to move the arc quickly towards the arc extinguishing device. When the arc enters the arc extinguishing device, the arc is divided and cooled by the grid, so that the arc voltage rises rapidly, and the grid fully cools the arc to extinguish, that is, the circuit is disconnected.
各位技术人员须知：虽然本发明已按照上述具体实施方式做了描述，但是本发明的发明思想并不仅限于此发明，任何运用本发明思想的改装，都将纳入本专利专利权保护范围内。 Notes to all technical personnel: Although the present invention has been described according to the above-mentioned specific embodiments, the inventive idea of the present invention is not limited to this invention, and any modification using the inventive idea will be included in the scope of protection of this patent.
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