A self-energizing arc extinguishing chamber

Abstract

The application discloses a self-arc-extinguishing chamber, which comprises a static contact and a dynamic contact, and further comprises a first supporting member, wherein the static contact is arranged on the first supporting member, and the static contact is provided with a first central hole which is communicated with the outside; a second supporting member is provided with a second central hole, the dynamic contact is slidably matched with the second central hole, and the first supporting member and the second supporting member form fixed volume containers which are respectively communicated with the first central hole and the second central hole; and a gas supplementing device is arranged and comprises a variable volume container which is communicated with the fixed volume container, so that the volume of the variable volume container is changed to supplement gas into the fixed volume container when the current is broken. According to the application, the gas molecules can be supplemented into the fixed volume container during the current breaking process, the problems of insufficient gas pressure and speed caused by the gas leakage from the static contact are solved, and the arc extinguishing capacity of the self-arc-extinguishing chamber is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of circuit breaker, in particular to a self-energized arc-extinguishing chamber. BACKGROUND

[0002] High-voltage circuit breaker (or high-voltage switch) can not only cut off or close the no-load current and load current in high-voltage circuit, but also cut off over-load current and short-circuit current when system failure occurs through the action of relay protection device, which has a quite perfect arc-extinguishing structure and sufficient breaking current capacity.

[0003] Self-energized arc-extinguishing chamber is a commonly used arc-extinguishing structure of circuit breaker, which mainly utilizes the arc energy itself to extinguish arc. The self-energized arc-extinguishing chamber in the prior art comprises a moving contact, a stationary contact, a front arc contact, a rear arc contact, an expansion chamber and a valve body, wherein the valve body is sleeved on the moving contact and can move back and forth along the axial direction of the moving contact.

[0004] When in the closed state, the valve body is in sealing contact with the rear arc contact, and the moving contact is in conductive connection with the stationary contact; when changing from the closed state to the open state, the valve body and the moving contact need to move away from the stationary contact. Since the moving contact is movably arranged in the valve body along the axial direction thereof, and the movement of the valve body lags behind the movement of the moving contact during the opening process, the moving contact moves first along the axial direction thereof, and then the valve body moves along the axial direction of the moving contact. Since the valve body is in sealing contact with the rear arc contact in the closed state, the gas in the expansion chamber is prevented from flowing out from the rear of the rear arc contact, thereby providing time for the gas pressure in the expansion chamber to rise during arc burning. After the valve body moves backward, a smooth gas flow channel is formed, and the gas pressure in this area is significantly lower than that in the expansion chamber, so that the gas in the expansion chamber can be sprayed and dispersed to the rear of the rear arc contact at a relatively high flow rate, thereby having a strong gas-blowing effect on the arc between the moving contact and the stationary contact, and promoting the extinction of the arc.

[0005] However, during the current breaking process (i.e. the open state), as the moving contact and the associated parts move, the moving contact is separated from the stationary contact and the front arc contact, and a part of the gas in the expansion chamber will leak from the stationary contact, so that the number of gas molecules available for thermal expansion and arc blowing in the expansion chamber is reduced, resulting in insufficient gas pressure and speed during small current breaking, and the breaking capacity is limited by the structure. When increasing the capacity of the product, there is not enough gas source during large current breaking, the pressure difference between the inside and outside of the arc-extinguishing gap is not enough, and the arc-extinguishing interval is not enough.

[0006] Therefore, how to compensate for the problem of insufficient gas pressure and speed caused by the leakage of gas from the stationary contact to improve the arc-extinguishing capacity of the self-energized arc-extinguishing chamber is a technical problem to be solved by those skilled in the art at present. SUMMARY

[0007] Therefore, the self-arc-extinguishing chamber is provided to solve the problem of insufficient gas pressure and speed caused by gas leakage from the static contact, so as to improve the arc-extinguishing capacity of the self-arc-extinguishing chamber.

[0008] In order to achieve the above-mentioned purpose, the present application provides the following technical solutions.

[0009] A self-arc-extinguishing chamber comprises a static contact and a dynamic contact, and further comprises:

[0010] A first support, wherein the static contact is arranged on the first support, and the static contact has a first central hole in communication with the outside;

[0011] A second support, wherein a second central hole is arranged on the second support, the dynamic contact is in sliding fit with the second central hole, and the first support and the second support form fixed volume containers in communication with the first central hole and the second central hole, respectively;

[0012] A gas supplement device, wherein a variable volume container is arranged in communication with the fixed volume containers, so as to supplement gas into the fixed volume containers by changing the volume of the variable volume container when the current is interrupted.

[0013] Preferably, in the self-arc-extinguishing chamber, the variable volume container comprises:

[0014] A variable cavity is arranged on the second support and is in communication with the fixed volume container through a connecting channel;

[0015] A moving piston is in sealing sliding fit with the inner wall of the variable cavity, so as to form the variable volume container with the variable cavity;

[0016] The gas supplement device further comprises a transmission device for driving the moving piston to slide along the variable cavity.

[0017] Preferably, in the self-arc-extinguishing chamber, the connecting channel is provided with a one-way valve, and the one-way valve is in an open state in the direction from the variable volume container to the fixed volume container.

[0018] Preferably, in the self-arc-extinguishing chamber, the moving piston is provided with a gas exchange device for supplementing gas into the variable volume container, and the gas exchange device is in a closed state in the direction from the variable volume container to the outside.

[0019] Preferably, in the self-arc-extinguishing chamber, the moving piston is provided with a pressure release device for releasing pressure when the pressure in the variable volume container exceeds a pressure threshold.

[0020] Preferably, in the self-arc-extinguishing chamber, the dynamic contact comprises:

[0021] a metal piece of the moving contact for circuit conduction with the stationary contact, the insertion end of the metal piece of the moving contact being used for insertion fit with a first central hole of the stationary contact;

[0022] a moving contact insulating piece arranged at the insertion end of the metal piece of the moving contact, a gap being formed between the moving contact insulating piece and the first central hole.

[0023] Preferably, in the self-arc-extinguishing chamber, the moving contact insulating piece is fixed to the metal piece of the moving contact by means of screw connection, sintering or adhesion.

[0024] Preferably, in the self-arc-extinguishing chamber, the moving contact insulating piece and the metal piece of the moving contact are both cylindrical structures, and the diameter of the moving contact insulating piece is smaller than that of the metal piece of the moving contact.

[0025] Preferably, in the self-arc-extinguishing chamber, the moving contact insulating piece and the metal piece of the moving contact are coaxially arranged.

[0026] Preferably, in the self-arc-extinguishing chamber, a gas guide made of insulating material is mounted on the second support, and the gas guide forms the second central hole.

[0027] The self-arc-extinguishing chamber provided by the application is provided with a fixed volume container between the first support and the second support, and is further provided with a gas supplement device for supplementing gas into the fixed volume container.

[0028] When large current breaking is performed, as the moving contact gradually separates from the stationary contact, the gas supplement device supplements gas into the fixed volume container, and the number of gas molecules in the fixed volume container is increased.

[0029] The application can supplement gas molecules into the fixed volume container during current breaking, and can compensate for the insufficient gas pressure and speed caused by gas leakage from the stationary contact, and can improve the arc-extinguishing capacity of the self-arc-extinguishing chamber. BRIEF DESCRIPTION OF DRAWINGS

[0030] In order to make the technical solutions in the embodiments of the present application or the prior art clearer, the accompanying drawings needed in the embodiments or prior art description will be briefly introduced. Obviously, the accompanying drawings in the following description only need to be some embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative labor.

[0031] Figure 1 The structure schematic diagram of the self-arc-extinguishing chamber in the closing state according to the embodiment of the present application is disclosed.

[0032] Figure 2 The structure schematic diagram of the self-arc-extinguishing chamber in the small current breaking state according to the embodiment of the present application is disclosed.

[0033] Figure 3 The structure schematic diagram of the self-arc-extinguishing chamber after the large current breaking according to the embodiment of the present application is disclosed.

[0034] Figure 4 The partial structure schematic diagram of the variable volume container according to the embodiment of the present application is disclosed.

[0035] Figure 5 The structure schematic diagram of the moving contact according to the embodiment of the present application is disclosed.

[0036] Figures 1 to 5 The meanings of the reference numerals in the accompanying drawings are as follows:

[0037] 101 is the first support, 102 is the second support, 103 is the fracture insulation connecting piece, 104 is the moving contact, 1041 is the moving contact metal piece, 1042 is the moving contact insulation piece, 105 is the static contact, 106 is the gas guide piece, 107 is the fixed volume container, 108 is the transmission device, 109 is the variable container wall, 110 is the variable volume container, 111 is the connecting channel, 112 is the one-way valve, 113 is the moving piston piece, 114 is the gas exchange device, 115 is the pressure release device, 116 is the first center hole, 117 is the small current breaking arc, 118 is the first center hole gas flow direction, 119 is the second center hole, 120 is the second center hole gas flow direction, and 121 is the large current breaking arc. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present application will be described clearly and completely below with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, and not all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the present application.

[0039] As Figure 1 andFigure 2 As shown, an embodiment of the present invention discloses a self-powered arc-extinguishing chamber, including a stationary contact 105, a moving contact 104, a first support member 101, a second support member 102, and a gas supply device.

[0040] The first support member 101 provides a mounting base for some functional components. For example, a stationary contact 105 can be mounted on the first support member 101, and the stationary contact 105 has a first central hole 116 that communicates with the outside. In order to ensure that the first central hole 116 of the stationary contact 105 can communicate with the outside, a corresponding opening needs to be made on the first support member 101, through which the first central hole 116 of the stationary contact 105 communicates with the outside.

[0041] like Figure 3 As shown, the second support member 102 functions similarly to the first support member 101, providing a mounting base for some functional components. The second support member 102 has a second central hole 119, and the moving contact 104 slides within the second central hole 119. A fixed volume container 107 is formed between the first support member 101 and the second support member 102, communicating with the first central hole 116 and the second central hole 119 respectively. Specifically, the first support member 101 and the second support member 102 can be arranged at intervals, and a break-insulating connector 103 can be installed between them, so that the first support member 101, the second support member 102, and the break-insulating connector 103 together form the fixed volume container 107.

[0042] The first central hole 116 and the second central hole 119 are connecting holes between the fixed volume container 107 and the outside. In the closed state, the moving contact 104 cooperates with the stationary contact 105, so that the moving contact 104 blocks the first central hole 116 and the second central hole 119, and the fixed volume container 107 is a closed container. In the open state, the moving contact 104 disengages from the stationary contact 105, so that the moving contact 104 disengages from the first central hole 116 and the second central hole 119 in sequence, and some gas in the fixed volume container 107 can be discharged to the outside through the first central hole 116 and the second central hole 119.

[0043] The gas replenishment device includes a variable-volume container 110 connected to the fixed-volume container 107, which replenishes gas into the fixed-volume container 107 when the current is interrupted by changing the volume of the variable-volume container 110. Those skilled in the art will understand that compressing the variable-volume container 110 increases the pressure within it, thereby causing the gas in the variable-volume container 110 to fill the fixed-volume container 107 under the influence of the pressure difference, thus achieving the purpose of replenishing gas into the fixed-volume container 107.

[0044] like Figure 2As shown, the self-arc-extinguishing chamber disclosed in the embodiments of the present application, when breaking small current, after the breaking operation, the volume of the variable volume container 110 of the air supplement device gradually decreases, and the pressure gradually increases, so as to press the gas in the variable volume container 110 into the fixed volume container 107 through the pressure difference, increase the number of gas molecules in the fixed volume container 107, and increase the pressure. At the same time, with the breaking operation, the static contact 105 and the moving contact 104 gradually separate, the small current breaking arc 117 is generated between the static contact 105 and the moving contact 104, the first central hole 116 is opened, the fixed volume container 107 is communicated with the outside through the first central hole 116, a pressure difference is formed between the fixed volume container 107 and the outside, the high-pressure gas in the fixed volume container 107 is blown out from the fixed volume container 107 and flows into the outside through the first central hole 116, and the first central hole gas flow direction 118 is formed. In this process, the number of gas molecules in the fixed volume container 107 is mainly ensured by the gas supplemented in the variable volume container 110, the pressure is increased, when the channel of the first central hole 116 is opened, the gas flow through the first central hole 116 reaches a flow rate sufficient to blow out the small current breaking arc 117, so as to extinguish the small current breaking arc 117, and realize the effect of successfully breaking the small current.

[0045] As shown, the self-arc-extinguishing chamber disclosed in the embodiments of the present application, when breaking small current, after the breaking operation, the volume of the variable volume container 110 of the air supplement device gradually decreases, and the pressure gradually increases, so as to press the gas in the variable volume container 110 into the fixed volume container 107 through the pressure difference, increase the number of gas molecules in the fixed volume container 107, and increase the pressure. At the same time, with the breaking operation, the static contact 105 and the moving contact 104 gradually separate, the small current breaking arc 117 is generated between the static contact 105 and the moving contact 104, the first central hole 116 is opened, the fixed volume container 107 is communicated with the outside through the first central hole 116, a pressure difference is formed between the fixed volume container 107 and the outside, the high-pressure gas in the fixed volume container 107 is blown out from the fixed volume container 107 and flows into the outside through the first central hole 116, and the first central hole gas flow direction 118 is formed. In this process, the number of gas molecules in the fixed volume container 107 is mainly ensured by the gas supplemented in the variable volume container 110, the pressure is increased, when the channel of the first central hole 116 is opened, the gas flow through the first central hole 116 reaches a flow rate sufficient to blow out the small current breaking arc 117, so as to extinguish the small current breaking arc 117, and realize the effect of successfully breaking the small current.

[0046] As shown, the self-arc-extinguishing chamber disclosed in the embodiments of the present application, when breaking small current, after the breaking operation, the volume of the variable volume container 110 of the air supplement device gradually decreases, and the pressure gradually increases, so as to press the gas in the variable volume container 110 into the fixed volume container 107 through the pressure difference, increase the number of gas molecules in the fixed volume container 107, and increase the pressure. At the same time, with the breaking operation, the static contact 105 and the moving contact 104 gradually separate, the small current breaking arc 117 is generated between the static contact 105 and the moving contact 104, the first central hole 116 is opened, the fixed volume container 107 is communicated with the outside through the first central hole 116, a pressure difference is formed between the fixed volume container 107 and the outside, the high-pressure gas in the fixed volume container 107 is blown out from the fixed volume container 107 and flows into the outside through the first central hole 116, and the first central hole gas flow direction 118 is formed. In this process, the number of gas molecules in the fixed volume container 107 is mainly ensured by the gas supplemented in the variable volume container 110, the pressure is increased, when the channel of the first central hole 116 is opened, the gas flow through the first central hole 116 reaches a flow rate sufficient to blow out the small current breaking arc 117, so as to extinguish the small current breaking arc 117, and realize the effect of successfully breaking the small current. Figure 3As shown, with the continuation of the opening action, the moving contact 104 continues to move away from the static contact 105 until the moving contact 104 is separated from the second central hole 119, at this time, the large current breaking arc 121 has been generated for a long enough time, and due to the large energy of the large current breaking arc 121 generating a large current, the gas temperature in the fixed volume container 107 rapidly increases, the pressure increases, under the action of the large current breaking arc 121, the gas in the fixed volume container 107 becomes a gas with a certain temperature and pressure, in order to make the gas pressure difference between the fixed volume container 107 and the outside reach a sufficient arc extinguishing degree, the fixed volume container 107 and the outside form a large pressure difference, when the moving contact 104 is completely withdrawn from the second central hole 119 during the opening process of the moving contact 104, a large amount of high-temperature and high-pressure gas is blown out from the second central hole 119 along the second central hole gas flow direction 120 under the action of the large pressure difference between the fixed volume container 107 and the outside, the large current breaking arc 121 is extinguished, thereby realizing large current breaking.

[0047] The self-arc extinguishing chamber disclosed in the embodiment of the application is provided with the fixed volume container 107 between the first support 101 and the second support 102, and is also provided with a gas supplementing device for supplementing gas into the fixed volume container 107. When small current breaking is performed, with the moving contact 104 gradually separated from the static contact 105, the gas supplementing device supplements gas into the fixed volume container 107, so that the pressure in the fixed volume container 107 increases, and at the same time, the arc generated between the moving contact 104 and the static contact 105 can heat the gas in the fixed volume container 107 to further increase the gas pressure, and finally the gas flow is blown out along the first central hole 116 of the static contact 105, thereby achieving the purpose of extinguishing the small current arc.

[0048] When large current breaking is performed, with the moving contact 104 gradually separated from the static contact 105, the gas supplementing device supplements gas into the fixed volume container 107, thereby increasing the number of gas molecules in the fixed volume container 107, and the arc extinguishing mainly relies on the arc energy heating to change the gas in the fixed volume container 107 into high-temperature and high-pressure gas, so that a large pressure difference is formed between the fixed volume container 107 and the outside, and after the moving contact 104 is withdrawn from the second central hole 119, the gas flow channel is opened, and the gas flow is quickly blown out from the second central hole 119, so that the gas flow speed reaches a speed sufficient to extinguish the large current arc.

[0049] The gas supplementing device is arranged in the self-arc extinguishing chamber, so that gas molecules can be supplemented into the fixed volume container 107 during the current breaking process, and the problems of insufficient gas pressure and speed caused by gas leakage from the static contact 105 are solved, and the arc extinguishing capacity of the self-arc extinguishing chamber is improved.

[0050] As shown in FIG. 1, the self-arc extinguishing chamber comprises a first support 101, a second support 102, a static contact 105, a moving contact 104, a fixed volume container 107, and a gas supplementing device. Figure 1 and Figure 4As shown, in the embodiment, the variable volume container 110 can include a variable cavity and a moving piston piece 113. The variable cavity is opened on the second support 102 and communicates with the fixed volume container 107 through the connecting channel 111. The moving piston piece 113 is in sealing sliding fit with the inner wall of the variable cavity to form the variable volume container 110 with the variable cavity. The moving piston piece 113 can be pushed to move along the variable cavity under the action of an external force, so as to change the pressure of the gas in the variable cavity. When the pressure increases, the gas in the variable cavity can be pressed into the fixed volume container 107 through the connecting channel 111.

[0051] The gas supplementing device further includes a transmission device 108 for driving the moving piston piece 113 to slide along the variable cavity. The transmission device 108 is used to drive the moving of the moving piston piece 113. When the moving piston piece 113 is driven to move away from the fixed volume container 107, the volume of the variable volume container 110 becomes larger to supplement the gas in the variable volume container 110. Correspondingly, when the moving piston piece 113 is driven to move close to the fixed volume container 107, the volume of the variable volume container 110 becomes smaller to increase the pressure of the gas in the variable volume container 110, so that the gas in the variable volume container 110 is pressed into the fixed volume container 107.

[0052] It should be noted that the transmission device 108 for driving the moving of the moving piston piece 113 and the driving device for driving the moving of the moving contact 104 can share one operating mechanism. That is, by operating the operating mechanism, the operating mechanism drives the moving piston piece 113 and the moving contact 104 to move together through the respective transmission devices. That is, when the moving contact 104 is driven to close, the moving piston piece 113 is driven to move away from the fixed volume container 107, so that the volume of the variable volume container 110 becomes larger. When the moving contact 104 is driven to open, the moving piston piece 113 is driven to move close to the fixed volume container 107, so that the volume of the variable volume container 110 becomes smaller. Of course, the transmission device 108 for driving the moving of the moving piston piece 113 and the driving device for driving the moving of the moving contact 104 can also adopt different operating mechanisms.

[0053] In order to avoid the gas in the fixed volume container 107 flowing into the variable volume container 110 when the pressure in the fixed volume container 107 is greater than the pressure in the variable volume container 110, in the embodiment, the end of the connecting channel 111 close to the fixed volume container 107 is provided with a one-way valve 112. The one-way valve 112 is in the open state in the direction from the variable volume container 110 to the fixed volume container 107 and is in the closed state in the direction from the fixed volume container 107 to the variable volume container 110.

[0054] When a pressure difference exists between the fixed-volume container 107 and the variable-volume container 110, and the pressure in the variable-volume container 110 is greater than the pressure in the fixed-volume container 107, gas in the variable-volume container 110 flows into the fixed-volume container 107 through the connecting channel 111 and the one-way valve 112 under the influence of the pressure difference. When the pressure in the fixed-volume container 107 is greater than the pressure in the variable-volume container 110, the one-way valve 112 shuts off and is in the closed state, preventing gas in the fixed-volume container 107 from flowing into the variable-volume container 110 through the connecting channel 111 and the one-way valve 112.

[0055] It should be noted that even without the one-way valve 112, and by maintaining constant communication between the fixed-volume container 107 and the variable-volume container 110, when the pressure inside the fixed-volume container 107 is greater than the pressure inside the variable-volume container 110, the gas inside the fixed-volume container 107 can flow into the variable-volume container 110 through the connecting channel 111 without significantly affecting the arc extinguishing effect. The transmission device 108 will resist the movement of the moving piston 113, reducing gas leakage loss inside the fixed-volume container 107.

[0056] like Figure 4 As shown, to facilitate the replenishment of gas into the variable volume container 110, in this embodiment, the moving piston 113 is provided with a gas exchange device 114 for replenishing gas into the variable volume container 110, and the gas exchange device 114 is in a closed state in the direction of the variable volume container 110 to the outside. The gas exchange device 114 is a one-way valve structure, which allows outside gas to enter the variable volume container 110 only through the gas exchange device 114, while the gas in the variable volume container 110 cannot flow out through the gas exchange device 114. When the transmission device 108 drives the moving piston 113 to move away from the fixed volume container 107, the volume of the variable volume container 110 increases and the pressure decreases. Under the action of the internal and external pressure difference, outside air enters the variable volume container 110 through the gas exchange device 114 to replenish the gas loss in the variable volume container 110.

[0057] It should be noted that even without the ventilation device 114 on the moving piston 113, the gas replenishment in the variable volume container 110 can still be completed. For example, the moving piston 113 can be driven to disengage from the variable cavity by the transmission device 108. At this time, the variable cavity is directly connected to the outside, and outside air can enter the variable cavity. The transmission device 108 can then drive the moving piston 113 back into the variable cavity to complete the gas replenishment in the variable volume container 110.

[0058] In one specific embodiment of the present invention, the moving piston 113 is further provided with a pressure relief device 115 for releasing pressure when the pressure inside the variable volume container 110 exceeds a pressure threshold. Those skilled in the art will understand that as the air inside the variable volume container 110 is compressed, the pressure and burden on the transmission device 108 increase, potentially posing a risk of damage to the transmission device 108 and the operating mechanism. This embodiment, by adding the pressure relief device 115, releases pressure when it exceeds the pressure threshold, thus avoiding the burden on the transmission device 108 and the operating mechanism due to excessive gas pressure inside the variable volume container 110.

[0059] like Figure 5 As shown, in a specific embodiment of the present invention, the moving contact 104 includes a moving contact metal part 1041 and a moving contact insulating part 1042. The moving contact metal part 1041 is used to establish circuit connection with the stationary contact 105, and its insertion end is used to engage with the first central hole 116 of the stationary contact 105. The moving contact insulating part 1042 is disposed at the insertion end of the moving contact metal part 1041, and a gap is formed between the moving contact insulating part 1042 and the first central hole 116. The moving contact insulating part 1042 is made of an ablation-resistant non-metallic material, while the moving contact metal part 1041 is made of an ablation-resistant metallic material.

[0060] like Figure 2 As shown, in the self-extinguishing arc chamber disclosed in this embodiment of the invention, after the opening operation is performed during a small current interruption, the transmission device 108 drives the moving piston 113 to move, pressing the gas in the variable volume container 110 into the fixed volume container 107 through the connecting channel 111, thereby increasing the number of gas molecules and the pressure in the fixed volume container 107. Simultaneously, as the opening operation proceeds, the stationary contact 105 and the moving contact 104 gradually separate, and the moving contact metal part 1041 of the stationary contact 105 and the moving contact 104 separates, creating a small gap between the stationary contact 105 and the moving contact metal part 1041. The small current interrupts the arc 117. Although the moving contact metal part 1041 has detached from the first central hole 116, the moving contact insulating part 1042 has not completely detached from the first central hole 116, so the first central hole 116 is not fully opened. During this process, the fixed volume container 107 communicates with the outside through the gap between the first central hole 116 and the moving contact insulating part 1042. A pressure difference is formed between the fixed volume container 107 and the outside. The high-pressure gas in the fixed volume container 107 is blown out through the gap and flows into the outside through the gap, forming the airflow direction 118 of the first central hole.

[0061] In the process, mainly rely on the variable volume container 110 in the gas to ensure the fixed volume container 107 gas molecules, while the moving contact 104 movement, moving contact insulation 1042 delay the first center hole 116 fully open time, the arc energy heating gas in fixed volume container 107, the pressure rises, when the first center hole 116 channel is fully open, through the first center hole 116 gas flow to the flow rate sufficient to blow out between the moving and static contact small current breaking arc 117, so as to extinguish between the moving and static contact small current breaking arc 117, realize the small current successfully breaking.

[0062] The self-arc-extinguishing chamber disclosed in the embodiment of the application, when breaking a large current, the transmission device 108 drives the moving piston 113 to move, and the gas in the variable volume container 110 is pressed into the fixed volume container 107 through the connecting channel 111, so that the number of gas molecules in the fixed volume container 107 increases and the pressure increases. At the same time, with the breaking operation, the static contact 105 and the moving contact 104 gradually separate, the static contact 105 and the moving contact metal piece 1041 of the moving contact 104 separate, and a large current breaking arc 121 with a large current is generated between the static contact 105 and the moving contact metal piece 1041 of the moving contact 104. Although the moving contact metal piece 1041 has been separated from the first center hole 116, the moving contact insulation 1042 has not completely separated from the first center hole 116, so that the first center hole 116 is not completely opened. In the process, the fixed volume container 107 can only communicate with the outside through the gap between the first center hole 116 and the moving contact insulation 1042. Because the energy of the large current breaking arc 121 is large, the temperature of the gas in the fixed volume container 107 rapidly increases, and the pressure increases. When the pressure in the fixed volume container 107 is greater than the pressure in the variable volume container 110, the one-way valve 112 is closed. Under the action of the large current breaking arc 121, the gas in the fixed volume container 107 becomes gas with a certain temperature and pressure.

[0063] As Figure 3As shown, with the continuation of the opening operation, the moving contact 104 continues to move away from the static contact 105 until the moving contact 104 is out of the second central hole 119, at this time, the large current breaking arc 121 has been generated for a long enough time, and due to the large energy of the large current breaking arc 121, the temperature of the gas in the fixed volume container 107 rapidly increases, the pressure increases, and under the action of the large current breaking arc 121, the gas in the fixed volume container 107 becomes a gas with a certain temperature and pressure, so as to make the gas pressure difference between the fixed volume container 107 and the outside reach a sufficient arc extinguishing degree, the fixed volume container 107 and the outside form a large pressure difference, and when the moving contact 104 is out of the second central hole 119 during the opening process, a large amount of high-temperature and high-pressure gas is blown out from the second central hole 119 along the second central hole gas flow direction 120 under the action of the large pressure difference between the fixed volume container 107 and the outside, the large current breaking arc 121 is extinguished, and thus the large current breaking is realized.

[0064] In this process, the plugging effect of the moving contact insulation piece 1042 on the high-pressure gas and the opening time of the moving contact 11 extended gas flow channel are mainly utilized, the large current breaking arc 121 is heated for a long enough time, the large pressure difference between the fixed volume container 107 and the outside is formed, and thus most of the gas is forced to be blown out at a high speed from the second central hole 119, the large current breaking arc 121 is extinguished, and thus the large current breaking is realized.

[0065] In an embodiment of the present application, the moving contact insulation piece 1042 can be fixed to the moving contact metal piece 1041 by means of threaded connection, sintering or adhesion. It should be noted that the moving contact insulation piece 1042 and the moving contact metal piece 1041 can also adopt other assembly relationships as long as the fixation of the two can be realized.

[0066] Optionally, the moving contact insulation piece 1042 and the moving contact metal piece 1041 can both be cylindrical structures and coaxially arranged, the diameter of the moving contact insulation piece 1042 is smaller than the diameter of the moving contact metal piece 1041, and then smaller than the diameter of the first central hole 116, so as to ensure that the moving contact insulation piece 1042 is not in contact with the static contact 105 and is not forced during the opening and closing process, the moving contact metal piece 1041 is in contact with the static contact 105 during the opening and closing process, and the arc is generated between the moving contact metal piece 1041 and the static contact 105 during the current breaking process; the moving contact insulation piece 1042 is also in the gas flow channel (not completely out of the first central hole 116), and the function is to delay the opening time of the gas flow channel, so as to establish sufficient pressure in the fixed volume container 107; the length of the moving contact insulation piece 1042 needs to be appropriately selected, so as to ensure that the fixed volume container 107 can establish sufficient pressure, and at the same time, the gas can flow out quickly after the gas flow channel is opened.

[0067] In one embodiment of the present application, the second support 102 is provided with a gas guide 106 of insulating material, the gas guide 106 forming a second central hole 119.

[0068] It should be noted that the various embodiments of the present application are described in a progressive manner in the specification, and each embodiment focuses on the differences from other embodiments. The same or similar parts between embodiments can be referred to each other.

[0069] As indicated in the present application and claims, unless the context clearly indicates otherwise, the words "one", "an", "a", and / or "the" do not mean the same as singular, and can also include plural. Generally, the terms "comprise" and "include" only indicate the inclusion of the steps and elements explicitly identified, and these steps and elements do not constitute an exclusive list, and the method or device can also include other steps or elements. The element defined by the statement "comprise a" does not exclude the presence of another identical element in the process, method, product or device comprising the element.

[0070] In the description of the embodiments of the present application, unless otherwise specified, " / " represents the meaning of or, for example, A / B can represent A or B; "and / or" in this document is only a description of the association relationship between the associated objects, which means that there can be three relationships, for example, A and / or B can represent: A alone, A and B together, and B alone. In addition, in the description of the embodiments of the present application, "multiple" means two or more than two.

[0071] Hereinafter, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first" and "second" can explicitly or implicitly include one or more of the features.

[0072] The principles and implementation modes of the present application are described by applying specific examples in this document, and the above description of the embodiments is only used to help understand the core idea of the present application. It should be noted that for ordinary skilled persons in the technical field, without departing from the principles of the present application, the present application can be improved and modified in several ways, and these improvements and modifications also fall within the protection scope of the claims of the present application.

Claims

1. A self-energized arc-extinguishing chamber, comprising a stationary contact (105) and a moving contact (104), characterized in that, Also includes: The first support member (101) is provided with the stationary contact (105) disposed on the first support member (101), and the stationary contact (105) has a first central hole (116) communicating with the outside. The second support member (102) is provided with a second central hole (119), and the moving contact (104) is slidably engaged with the second central hole (119). A fixed volume container (107) is formed between the first support member (101) and the second support member (102) respectively communicating with the first central hole (116) and the second central hole (119). The gas replenishment device includes a variable volume container (110) connected to the fixed volume container (107) to replenish gas into the fixed volume container (107) when the current is interrupted by changing the volume of the variable volume container (110). The moving contact (104) includes: A moving contact metal part (1041) for making circuit connection with the stationary contact (105), wherein the insertion end of the moving contact metal part (1041) is used to be inserted into the first center hole (116) of the stationary contact (105); A moving contact insulating member (1042) is disposed at the insertion end of the moving contact metal member (1041), and a gap is formed between the moving contact insulating member (1042) and the first central hole (116). Both the moving contact insulator (1042) and the moving contact metal part (1041) are cylindrical structures. The diameter of the moving contact insulator (1042) is smaller than that of the moving contact metal part (1041) to ensure that during the opening and closing process, the moving contact insulator (1042) does not contact the stationary contact (105), and only the moving contact metal part (1041) and the stationary contact (105) are in contact, so that when the current is interrupted, an arc is generated between the moving contact metal part (1041) and the stationary contact (105), while the moving contact insulator (1042) is still in the airflow channel to delay the opening time of the airflow channel, so that sufficient pressure is built up in the fixed volume container (107).

2. The self-energized arc-extinguishing chamber according to claim 1, characterized in that, The variable volume container (110) includes: A variable cavity is formed on the second support member (102) and is connected to the fixed volume container (107) through a connecting channel (111); The moving piston (113) is in a sealing sliding fit with the inner wall of the variable cavity to form the variable volume container (110) with the variable cavity; The air supply device also includes a transmission device (108) that drives the moving piston (113) to slide along the variable cavity.

3. The self-energized arc-extinguishing chamber according to claim 2, characterized in that, The connection channel (111) is provided with a one-way valve (112), which is in a conducting state in the direction from the variable volume container (110) to the fixed volume container (107).

4. The self-energized arc-extinguishing chamber according to claim 2, characterized in that, The moving piston (113) is provided with a gas exchange device (114) for replenishing gas into the variable volume container (110), and the gas exchange device (114) is in a closed state in the direction of the variable volume container (110) to the outside.

5. The self-energized arc-extinguishing chamber according to claim 2, characterized in that, The moving piston (113) is provided with a pressure relief device (115) for releasing pressure when the pressure in the variable volume container (110) exceeds the pressure threshold.

6. The self-energized arc-extinguishing chamber according to claim 1, characterized in that, The moving contact insulating component (1042) is fixed to the moving contact metal component (1041) by means of threaded connection, sintering or bonding.

7. The self-energized arc-extinguishing chamber according to claim 1, characterized in that, The moving contact insulating component (1042) and the moving contact metal component (1041) are arranged coaxially.

8. The self-energized arc-extinguishing chamber according to any one of claims 1-5, characterized in that, The second support member (102) is equipped with a gas guide (106) made of insulating material, which forms the second central hole (119).

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