Circuit breaker and switch cabinet

Abstract

The present invention relates to a circuit breaker and a switch cabinet, the circuit breaker comprises: an arc extinguishing chamber and an isolating structure, the arc extinguishing chamber has an external terminal, the isolating structure comprises an outlet seat conductively connected to the external terminal, a moving contact guided and moved on the outlet seat in a straight line direction, and a stationary contact seat for connecting with the moving contact, the moving contact has a connection position connected with the stationary contact seat and an isolation position disconnected from the stationary contact seat in a straight line reciprocating movement stroke, the stationary contact seat has an insertion channel for the moving contact to be inserted, a vent connected to the outside is provided on the insertion channel, a moving contact heat dissipation channel is connected in the moving contact, when the moving contact is in the connection position, the moving contact heat dissipation channel is connected to the insertion channel, so that airflow can enter and exit through the insertion channel and the moving contact heat dissipation channel, so as to achieve heat dissipation of the moving contact and the stationary contact seat. The purpose of the present invention is to provide a circuit breaker to solve the problem of temperature rise of the existing circuit breaker under natural air cooling conditions.

Description

Technical Field

[0001] The invention relates to a circuit breaker and a switch cabinet. Background Art

[0002] With the continuous progress of science and technology, people have higher and higher requirements for power distribution products. In this context, switchgear as an electrical equipment has gradually been used more and more. Circuit breakers are often configured in switchgear to control and protect high-voltage electrical equipment because of their small size, light weight, suitable for frequent operation, and arc extinguishing without maintenance.

[0003] The Chinese invention patent with the authorization announcement number CN103681098B discloses a circuit breaker with an isolation position and a switch cabinet using the circuit breaker. The switch cabinet includes a cabinet body, a circuit breaker chamber and a busbar chamber and a cable chamber respectively located above and below the circuit breaker are provided in the cabinet body. The circuit breaker with the isolation position is movably assembled on a track at the bottom of the circuit breaker chamber. The circuit breaker with the isolation position includes an arc extinguishing chamber arranged vertically, the arc extinguishing chamber has an upper electrode and a lower electrode, and an upper outlet seat connected to the upper electrode is fixed on the top of the arc extinguishing chamber, and a lower outlet seat connected to the lower electrode is fixed on the bottom. The circuit breaker with the isolation position also includes an upper isolating movable contact that is movably assembled in the upper outlet seat and in conductive contact with the upper outlet seat, an upper and lower guide movable contact, and an upper and lower guide movable contact. A lower isolating moving contact is movably assembled in the lower outlet seat and is in conductive contact with the lower outlet seat. The upper isolating moving contact has an upper connection position and a lower isolation position in its up and down movement. The lower isolating moving contact has a lower connection position and an upper isolation position in its up and down movement. When the upper isolating moving contact and the lower isolating moving contact are in the connection position, the upper isolating moving contact contacts the upper isolating static contact in the busbar chamber, and the lower isolating moving contact contacts the lower isolating static contact in the cable chamber. At this time, the circuit breaker is in the connection state. When the upper isolating moving contact and the lower isolating moving contact are in the isolation position, the upper isolating moving contact and the lower isolating moving contact are respectively separated from the corresponding upper isolating static contact and the lower isolating static contact to form an isolation port. At this time, the circuit breaker is in the isolation state. The upper isolating static contact is the upper isolating static contact seat, and the lower isolating static contact is the lower isolating static contact seat. The upper end of the above-mentioned arc extinguishing chamber is the static end, and the lower end is the moving end. The upper electrode and the lower electrode respectively constitute the static external end and the moving external end of the arc extinguishing chamber. The lower isolating moving contact, the lower isolating static contact seat, and the lower outlet seat constitute the moving end isolation structure, and the upper isolating moving contact, the upper isolating static contact seat, and the upper outlet seat constitute the static end isolation structure.

[0004] However, the temperature rise of the above-mentioned circuit breaker often exceeds the standard when it is cooled by natural air under the action of large current. Therefore, in order to reduce the temperature rise, fans are often used for forced cooling. However, using fans for cooling increases the daily maintenance workload of the switch cabinet and reduces the reliability of the switch cabinet during use. Summary of the invention

[0005] The object of the present invention is to provide a circuit breaker to solve the problem of temperature rise of the existing circuit breaker under natural air cooling. The present invention also provides a switch cabinet to solve the problem of low reliability of the existing switch cabinet under natural air cooling.

[0006] The technical solution of the circuit breaker of the present invention is:

[0007] Circuit breakers include:

[0008] An arc extinguishing chamber having an external terminal;

[0009] An isolation structure, the isolation structure is conductively connected to the external terminal of the arc extinguishing chamber, and the isolation structure includes an outlet seat conductively connected to the external terminal, a moving contact guided and moved along a straight line and assembled on the outlet seat, and a stationary contact seat for connecting with the moving contact;

[0010] The moving contact has a connection position connected with the stationary contact seat and an isolation position disconnected with the stationary contact seat during the linear reciprocating movement.

[0011] The stationary contact seat has an insertion channel for inserting the moving contact, one end of the insertion channel has a moving contact insertion opening for inserting the moving contact, and the other end has a ventilating opening connected to the outside;

[0012] There is a moving contact heat dissipation channel running through the moving contact;

[0013] When the moving contact is in the on position, the moving contact heat dissipation channel and the insertion channel are interconnected, so that air can enter and exit through the insertion channel and the moving contact heat dissipation channel to achieve heat dissipation for the moving contact and the stationary contact seat.

[0014] Beneficial effects: A through moving contact heat dissipation channel is arranged in the moving contact of the circuit breaker of the present invention, the static contact seat has an insertion channel for inserting the moving contact, and one end of the insertion channel has a moving contact insertion port for inserting the moving contact, and the other end has a vent connected to the outside world. When the moving contact is in the connection position, the moving contact heat dissipation channel, the insertion channel and the vent are connected to each other. When the circuit breaker is connected, the airflow will pass through the vent to enter and exit the insertion channel and the moving contact heat dissipation channel. The heat generated at the moving contact and the static contact seat will be discharged along with the airflow, thereby improving the heat dissipation efficiency of the circuit breaker under natural air cooling conditions and reducing the temperature rise.

[0015] Furthermore, the two external ends of the arc extinguishing chamber are arranged up and down, and the moving contact is guided and moved up and down in the vertical direction and assembled on the outlet seat.

[0016] Beneficial effects: This vertical arrangement utilizes the chimney effect. When the circuit breaker is turned on, the convection effect between the moving contact heat dissipation channel and the insertion channel and the outside world is enhanced. The heat generated at the moving contact and the stationary contact seat can be discharged more quickly through the moving contact heat dissipation channel and the insertion channel.

[0017] Furthermore, there are two isolation structures, which are conductively connected to the two external ends of the arc extinguishing chamber respectively, and the two external ends of the arc extinguishing chamber are respectively a moving external end and a static external end. The isolation structure conductively connected to the moving external end is the moving end isolation structure, and the isolation structure conductively connected to the static external end is the static end isolation structure. In the moving end isolation structure, the static contact seat is located at the lower side of the moving contact; in the static end isolation structure, the static contact seat is located at the upper side of the moving contact; the central axis of the arc extinguishing chamber is located on the plane where the central axes of the moving contacts of the two isolation structures are located.

[0018] Beneficial effects: The arrangement of the two isolation structures further improves the safety of the circuit breaker during use. In addition, the arrangement of the central axes of the moving contacts of the two isolation structures and the central axis of the arc extinguishing chamber in the same plane reduces the space occupied by the circuit breaker and thus reduces the volume of the switch cabinet.

[0019] Furthermore, there are two isolation structures, which are conductively connected to the two external ends of the arc extinguishing chamber respectively, and the two external ends of the arc extinguishing chamber are a moving external end and a static external end respectively. The isolation structure conductively connected to the moving external end is a moving end isolation structure, and the isolation structure conductively connected to the static external end is a static end isolation structure. An insulating shell is provided on the outside of the arc extinguishing chamber, and a moving end active cavity for the moving external end to move is provided in the insulating shell. The outlet seat of the moving end isolation structure includes a connecting arm and a seat body. A moving contact through-hole is provided on the seat body, which is conductive to the moving contact of the moving end isolation structure and for the moving contact of the moving end isolation structure to pass through. A heat dissipation channel of the outlet seat is provided on the connecting arm. The heat dissipation channel of the outlet seat connects the moving contact through-hole and the moving end active cavity, so that the heat of the moving end active cavity can be dissipated through the heat dissipation channel of the outlet seat.

[0020] Beneficial effect: This setting of the outlet seat enables the heat of the moving end active cavity to be dissipated along the outlet seat heat dissipation channel, effectively improving the heat dissipation efficiency of the moving end active cavity, thereby reducing the temperature rise at the moving external end of the arc extinguishing chamber under natural air cooling conditions.

[0021] Furthermore, the seat body is provided with a heat dissipation hole connecting the moving contact through hole with the outside.

[0022] Beneficial effect: The setting of the heat dissipation holes facilitates the heat dissipation to the outside, avoids the heat accumulation in the moving contact perforation, and effectively reduces the temperature rise.

[0023] Furthermore, a ventilation groove is provided on the inner wall of the moving contact through hole, and one end opening of the outlet seat heat dissipation channel is located at the bottom of the ventilation groove.

[0024] Beneficial effect: This arrangement makes the distance between the opening at one end of the heat dissipation channel and the moving contact larger, which facilitates the heat to be dissipated from the opening of the heat dissipation channel.

[0025] Furthermore, the stationary contact seat includes a stationary contact column that is conductive with the moving contact and a terminal for connecting to the busbar, the terminal is connected to one end of the stationary contact column, the insertion channel is arranged in the stationary contact column, and the terminal is arranged at the vent of the stationary contact column.

[0026] Beneficial effects: The structure of the static contact seat is simple.

[0027] Furthermore, the outlet seat is provided with a moving contact through-hole which is electrically conductive with the moving contact and for the moving contact to pass through, and the hole wall of the moving contact through-hole is provided with a heat dissipation hole which connects the outside with the moving contact through-hole.

[0028] Beneficial effect: The arrangement of the heat dissipation holes and the moving contact perforations enables the heat generated between the moving contact and the outlet seat to be discharged through the heat dissipation holes, thereby avoiding heat accumulation in the moving contact perforations and effectively reducing temperature rise.

[0029] Furthermore, the moving contact is a hollow straight tube.

[0030] Beneficial effects: The structure of the hollow straight tube is simple and easy to process.

[0031] The technical solution of the switch cabinet of the present invention is:

[0032] The switch cabinet includes a cabinet body and a circuit breaker arranged in the cabinet body;

[0033] Circuit breakers include:

[0034] An arc extinguishing chamber having an external terminal;

[0035] An isolation structure, the isolation structure is conductively connected to the external terminal of the arc extinguishing chamber, and the isolation structure includes an outlet seat conductively connected to the external terminal, a moving contact guided and moved along a straight line and assembled on the outlet seat, and a stationary contact seat for connecting with the moving contact;

[0036] The moving contact has a connection position connected with the stationary contact seat and an isolation position disconnected with the stationary contact seat during the linear reciprocating movement.

[0037] The stationary contact seat has an insertion channel for inserting the moving contact, one end of the insertion channel has a moving contact insertion opening for inserting the moving contact, and the other end has a ventilating opening connected to the outside;

[0038] There is a moving contact heat dissipation channel running through the moving contact;

[0039] When the moving contact is in the on position, the moving contact heat dissipation channel and the insertion channel are interconnected, so that air can enter and exit through the insertion channel and the moving contact heat dissipation channel to achieve heat dissipation for the moving contact and the stationary contact seat.

[0040] Beneficial effect: The moving contact of the circuit breaker of the present invention is provided with a through moving contact heat dissipation channel, the static contact seat has an insertion channel for the moving contact to be inserted, and one end of the insertion channel has a moving contact insertion port for the moving contact to be inserted, and the other end has a vent connected to the outside world. When the moving contact is in the connection position, the moving contact heat dissipation channel, the plug-in channel and the vent are interconnected. When the circuit breaker is connected, the airflow will pass through the vent to enter and exit the insertion channel and the moving contact heat dissipation channel. The heat generated at the moving contact and the static contact seat will be discharged with the airflow, thereby improving the heat dissipation efficiency of the circuit breaker under natural air cooling conditions and reducing the temperature rise. Therefore, under natural air cooling conditions, the switch cabinet reduces the daily maintenance workload of the switch cabinet and improves the reliability of the switch cabinet.

[0041] Furthermore, the two external ends of the arc extinguishing chamber are arranged up and down, and the moving contact is guided and moved up and down in the vertical direction and assembled on the outlet seat.

[0042] Beneficial effects: This vertical arrangement utilizes the chimney effect. When the circuit breaker is turned on, the convection effect between the moving contact heat dissipation channel and the insertion channel and the outside world is enhanced. The heat generated at the moving contact and the stationary contact seat can be discharged more quickly through the moving contact heat dissipation channel and the insertion channel.

[0043] Furthermore, there are two isolation structures, which are conductively connected to the two external ends of the arc extinguishing chamber respectively, and the two external ends of the arc extinguishing chamber are respectively a moving external end and a static external end. The isolation structure conductively connected to the moving external end is the moving end isolation structure, and the isolation structure conductively connected to the static external end is the static end isolation structure. In the moving end isolation structure, the static contact seat is located at the lower side of the moving contact; in the static end isolation structure, the static contact seat is located at the upper side of the moving contact; the central axis of the arc extinguishing chamber is located on the plane where the central axes of the moving contacts of the two isolation structures are located.

[0044] Beneficial effects: The arrangement of the two isolation structures further improves the safety of the circuit breaker during use. In addition, the arrangement of the central axes of the moving contacts of the two isolation structures and the central axis of the arc extinguishing chamber in the same plane reduces the space occupied by the circuit breaker and thus reduces the volume of the switch cabinet.

[0045] Furthermore, there are two isolation structures, which are conductively connected to the two external ends of the arc extinguishing chamber respectively, and the two external ends of the arc extinguishing chamber are a moving external end and a static external end respectively. The isolation structure conductively connected to the moving external end is a moving end isolation structure, and the isolation structure conductively connected to the static external end is a static end isolation structure. An insulating shell is provided on the outside of the arc extinguishing chamber, and a moving end active cavity for the moving external end to move is provided in the insulating shell. The outlet seat of the moving end isolation structure includes a connecting arm and a seat body. A moving contact through-hole is provided on the seat body, which is conductive to the moving contact of the moving end isolation structure and for the moving contact of the moving end isolation structure to pass through. A heat dissipation channel of the outlet seat is provided on the connecting arm. The heat dissipation channel of the outlet seat connects the moving contact through-hole and the moving end active cavity, so that the heat of the moving end active cavity can be dissipated through the heat dissipation channel of the outlet seat.

[0046] Beneficial effect: This setting of the outlet seat enables the heat of the moving end active cavity to be dissipated along the outlet seat heat dissipation channel, effectively improving the heat dissipation efficiency of the moving end active cavity, thereby reducing the temperature rise at the moving external end of the arc extinguishing chamber under natural air cooling conditions.

[0047] Furthermore, the seat body is provided with a heat dissipation hole connecting the moving contact through hole with the outside.

[0048] Beneficial effect: The setting of the heat dissipation holes facilitates the heat to dissipate outwards, avoids the heat accumulation in the moving contact perforation, and effectively reduces the temperature rise.

[0049] Furthermore, a ventilation groove is provided on the inner wall of the moving contact through hole, and one end opening of the heat dissipation channel of the outlet seat is located at the bottom of the ventilation groove.

[0050] Beneficial effect: This arrangement makes the distance between the opening at one end of the heat dissipation channel and the moving contact larger, which facilitates the heat to be dissipated from the opening of the heat dissipation channel.

[0051] Furthermore, the stationary contact seat includes a stationary contact column that is conductive with the moving contact and a terminal for connecting to the busbar, the terminal is connected to one end of the stationary contact column, the insertion channel is arranged in the stationary contact column, and the terminal is arranged at the vent of the stationary contact column.

[0052] Beneficial effects: The structure of the static contact seat is simple.

[0053] Furthermore, the outlet seat is provided with a moving contact through-hole which is electrically conductive with the moving contact and for the moving contact to pass through, and the hole wall of the moving contact through-hole is provided with a heat dissipation hole which connects the outside with the moving contact through-hole.

[0054] Beneficial effect: The arrangement of the heat dissipation holes and the moving contact perforations enables the heat generated between the moving contact and the outlet seat to be discharged through the heat dissipation holes, thereby avoiding heat accumulation in the moving contact perforations and effectively reducing temperature rise.

[0055] Furthermore, the moving contact is a hollow straight tube.

[0056] Beneficial effects: The structure of the hollow straight tube is simple and easy to process. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] Figure 1 It is a partial structural schematic diagram of a switch cabinet embodiment 1 of the present invention;

[0058] Figure 2 It is a connection diagram of the sealed pole, outlet seat and moving contact;

[0059] Figure 3 This is a schematic diagram of the circuit breaker in the isolation position;

[0060] Figure 4 This is a schematic diagram of the circuit breaker in the on position;

[0061] Figure 5 It is a cross-sectional view of the moving contact at the static end;

[0062] Figure 6 It is a structural diagram of the static contact seat at the static end;

[0063] Figure 7 for Figure 6 A top view of

[0064] Figure 8 It is a structural diagram of the static contact seat at the moving end;

[0065] Fig. 9 for Figure 8 Bottom view of

[0066] Fig.10 It is a structural diagram of the moving end outlet seat;

[0067] Fig.11 It is a schematic diagram of the connection between the moving end isolation structure and the sealed pole.

[0068] In the figure: 1, support frame; 2, sealed pole; 201, insulating shell; 202, arc extinguishing chamber; 3, running wheel; 4, static end outlet seat; 401, static end connecting arm; 402, static end seat body; 5, static end moving contact; 501, static end heat dissipation channel; 502, static end rack; 6, static end static contact seat; 601, static end terminal; 602, static end static contact column; 603, static end insulator; 7, dynamic end heat dissipation hole; 8, static end vent; 9, static end heat dissipation hole; 10, dynamic end outlet seat; 101, dynamic end seat body; 102, arm body; 103, conductive connection seat; 11, dynamic end moving contact; 111, dynamic end heat dissipation channel; 112, dynamic end rack ; 12. Moving end static contact seat; 121. Moving end terminal; 122. Moving end static contact column; 123. Moving end insulator; 13. Moving end insertion channel; 14. Moving end vent; 15. Moving external terminal connection hole; 16. Moving end movable cavity; 17. Insulating pull rod; 18. Moving conductive rod; 19. Conductive block; 20. Soft connection; 21. Connecting seat heat dissipation hole; 22. Pole heat dissipation hole; 23. Moving end moving contact perforation; 24. Contact finger groove; 25. Ventilation groove; 26. Outlet seat heat dissipation channel; 27. Moving end gear; 28. Mechanism box; 29. ​​Static end transmission rod; 30. Moving end transmission rod; 31. Circuit breaker room; 32. Busbar room; 33. Cable room. DETAILED DESCRIPTION

[0069] In order to make the purpose, technical scheme and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention, that is, the embodiments described are only part of the embodiments of the present invention, rather than all of the embodiments. The components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0070] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present invention.

[0071] It should be noted that relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0072] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0073] Specific embodiment 1 of the switch cabinet of the present invention:

[0074] like Figures 1 to 5 As shown, the switch cabinet includes a cabinet body and a circuit breaker arranged in the cabinet body. In this embodiment, the circuit breaker is a vacuum circuit breaker. The cabinet body is provided with a circuit breaker chamber 31 and a busbar chamber 32 located above the circuit breaker chamber 31 and a cable chamber 33 located below the circuit breaker chamber 31. The circuit breaker is located in the circuit breaker chamber 31.

[0075] The circuit breaker includes a carrier frame 1 and a sealed pole 2 arranged on the carrier frame 1. The three vertical sealed poles 2 are arranged in parallel and spaced apart along the length direction of the carrier frame 1. The sealed pole 2 includes an insulating shell 201. An arc extinguishing chamber 202 is arranged inside the insulating shell 201. In the present embodiment, the arc extinguishing chamber 202 is a vacuum arc extinguishing chamber. The arc extinguishing chamber 202 has two external terminals, namely, a static external terminal at the upper part of the arc extinguishing chamber 202 and a dynamic external terminal at the lower part of the arc extinguishing chamber 202. The circuit breaker also includes an isolation structure conductively connected to the external terminal of the arc extinguishing chamber 202. In the present embodiment, there are two isolation structures, namely, a static end isolation structure conductively connected to the static external terminal and a dynamic end isolation structure conductively connected to the dynamic external terminal.

[0076] The static end isolation structure includes a static end outlet seat 4 fixed on the upper part of the arc extinguishing chamber 202 and conductively connected to the static external terminal, a static end moving contact 5 installed on the static end outlet seat 4 and guided and moved up and down in the vertical direction, and a static end static contact seat 6 for connecting with the static end moving contact 5. The static end static contact seat 6 is fixed on the top of the circuit breaker chamber 31 and connected to the busbar in the busbar chamber 32. The static end moving contact 5 has a connection position connected with the static end static contact seat 6 and an isolation position disconnected from the static end static contact seat 6 during its up and down linear reciprocating movement.

[0077] like Figures 4 to 7As shown, in order to facilitate better connection between the static end moving contact 5 and the static end static contact seat 6, a static end insertion channel is provided on the static end static contact seat 6. Specifically, the static end static contact seat 6 includes a static end static contact column 602 and a static end wiring terminal 601. The static end static contact column 602 has a static end insertion channel for inserting the static end moving contact 5. One end of the static end insertion channel is the static end moving contact insertion port, and the other end has a static end vent 8 connected to the outside. The static end wiring terminal 601 is used to connect to the busbar in the busbar chamber 32. The static end wiring terminal 601 is connected to one end of the static end static contact column 602 and is arranged at the static end vent 8 of the static end static contact column 602. In addition, in order to prevent the cabinet body of the switch cabinet from being electrified when the static end static contact seat 6 is connected, the static end static contact seat 6 also includes a static end insulator 603 arranged on the outer peripheral surface of the static end static contact tube column 602, and the static end static contact tube column 602 and the static end terminal 601 are fixed to the top of the circuit breaker chamber 31 through the static end insulator 603.

[0078] The structure of the static end moving contact 5 is as follows Figure 5 As shown, the static end moving contact 5 is a hollow straight tube as a whole, and the internal channel of the hollow straight tube is the static end heat dissipation channel 501. When the static end moving contact 5 is in the connection position, the static end heat dissipation channel 501, the static end insertion channel 7 and the static end vent 8 are interconnected, and the airflow will enter and exit the static end insertion channel and the static end heat dissipation channel 501 through the static end vent 8, and the heat generated at the static end moving contact 5 and the static end static contact seat 6 will be discharged with the airflow. In addition, the vertical arrangement of the static end isolation structure utilizes the chimney effect, strengthens the convection effect between the static end heat dissipation channel 501 and the static end insertion channel and the outside world, and the heat generated at the static end moving contact 5 and the static end static contact seat 6 can be discharged faster through the static end heat dissipation channel 501 and the static end insertion channel 7.

[0079] The static end outlet seat 4 includes a static end connecting arm 401 and a static end seat body 402. One end of the static end connecting arm 401 is conductively connected to the static end seat body 402, and the other end is conductively connected to the static end seat body 402. The static end seat body 402 is provided with a static end moving contact through-hole that is conductive to the static end moving contact 5 and for the static end moving contact 5 to pass through. In order to facilitate the static end moving contact 5 to slide in the static end moving contact through-hole, a static end rack 502 is provided on the outer peripheral surface of the static end moving contact 5 along the extension direction of the static end moving contact 5. Correspondingly, a static end gear that slidably cooperates with the static end rack 502 is provided on the inner wall of the static end moving contact through-hole. In addition, a static end heat dissipation hole 9 that connects the outside world and the static end moving contact through-hole is provided on the hole wall of the static end moving contact through-hole. The arrangement of the static end heat dissipation hole 9 facilitates the heat to dissipate outward, avoids the heat accumulation in the static end moving contact through-hole, and effectively reduces the temperature rise. A contact finger is also provided on the hole wall of the static end moving contact, and the contact finger is used to realize the conductive connection between the static end moving contact 5 and the static end seat body 402.

[0080] The moving end isolation structure includes a moving end outlet seat 10 fixed at the lower part of the arc extinguishing chamber 202 and conductively connected to the moving external terminal, a moving end moving contact 11 installed on the moving end outlet seat 10 and guided and moved up and down in the vertical direction, and a moving end static contact seat 12 used to connect with the moving end moving contact 11. The moving end static contact seat 12 is fixed at the bottom of the circuit breaker chamber 31 and connected to the cable in the cable chamber 33. The moving end moving contact 11 has a connection position connected with the moving end static contact seat 12 and an isolation position disconnected from the moving end static contact seat 12 during its up and down linear reciprocating movement.

[0081] like Figures 8 to 11 As shown, in order to facilitate better connection between the moving end moving contact 11 and the moving end static contact seat 12, a moving end insertion channel 13 is provided on the moving end static contact seat 12. Specifically, the moving end static contact seat 12 includes a moving end static contact column 122 and a moving end terminal 121. The moving end static contact column 122 has a moving end insertion channel 13 for inserting the moving end moving contact 11. One end of the moving end insertion channel 13 is a moving end moving contact insertion port, and the other end has a moving end vent 14 connected to the outside. The moving end terminal 121 is used to connect to the cable in the cable chamber 33. The moving end terminal 121 is connected to one end of the moving end static contact column 122 and is arranged at the moving end vent 14 of the moving end static contact column 122. In addition, in order to prevent the cabinet body of the switch cabinet from being electrified when the moving end static contact seat 12 is connected, the moving end static contact seat 12 also includes a moving end insulator 123 arranged on the outer peripheral surface of the moving end static contact tube column 122, and the moving end static contact tube column 122 and the moving end terminal 121 are fixed to the bottom of the circuit breaker chamber 31 through the moving end insulator 123.

[0082] The structure of the moving contact 11 at the moving end is as follows: Fig.11 As shown, the moving end moving contact 11 is a hollow straight tube as a whole, and the internal channel of the hollow straight tube is the moving end heat dissipation channel 111. When the moving end moving contact 11 is in the connection position, the moving end heat dissipation channel 111, the moving end insertion channel 13 and the moving end vent 14 are interconnected, and the airflow will enter and exit the moving end insertion channel 13 and the moving end heat dissipation channel 111 through the moving end vent 14, so that the heat generated at the moving end moving contact 11 and the moving end static contact seat 12 will be discharged with the airflow. In addition, the vertical arrangement of the moving end isolation structure utilizes the chimney effect, strengthens the convection effect between the moving end heat dissipation channel 111 and the moving end insertion channel 13 and the outside world, and the heat generated at the moving end moving contact 11 and the moving end static contact seat 12 can be discharged more quickly through the moving end heat dissipation channel 111 and the moving end insertion channel 13.

[0083] like Fig.10 ,and Fig.11 As shown, the movable end outlet seat 10 includes a movable end seat body 101 and a movable end connecting arm, and the movable end connecting arm includes an arm body 102 and a conductive connecting seat 103. The movable end outlet seat 10 is integrally formed, and the integrally formed movable end outlet seat 10 generates little heat when current is flowing.

[0084] The conductive connection seat 103 is a cylindrical shell, and a movable external connection terminal connection hole 15 is provided on the cylindrical shell. The movable external connection terminal of the arc extinguishing chamber 202 is located in a movable terminal movable cavity 16 for the movable external connection terminal to move up and down in the insulating shell 201. The movable external connection terminal includes a movable conductive rod 18, which is fastened and assembled with an insulating pull rod 17 by a threaded connection. The insulating pull rod 17 is driven by the driving mechanism of the circuit breaker, and the insulating pull rod 17 drives the movable conductive rod 18 to reciprocate in the up and down direction to realize the dynamic The external terminal is connected and disconnected with the static external terminal. The dynamic conductive rod 18 is inserted into the conductive connection seat 103 through the dynamic external terminal connection hole 15. The dynamic conductive rod 18 is conductively connected with a conductive block 19. The conductive block 19 is conductively connected to the hole wall of the dynamic external terminal connection hole 15 through a flexible connection 20. Specifically, the flexible connection 20 includes several copper braids, which are arranged around the conductive block 19. One end of the copper braid is connected to the conductive block 19, and the other end is connected to the hole wall of the dynamic external terminal connection hole 15. In addition, a connection seat heat dissipation hole 21 is provided on the hole wall of the dynamic external terminal connection hole 15. Correspondingly, a pole heat dissipation hole 22 is provided on the insulating shell 201. The opening of the connection seat heat dissipation hole 21 is directly opposite to the opening of the pole heat dissipation hole 22. This arrangement facilitates the discharge of heat from the inside of the insulating shell 201. The flexible connection 20 is a commonly used soft conductor in this field, which can realize the conductive connection between two relatively moving conductors. In addition to copper braided belt, the commonly used flexible connection 20 also includes copper foil, copper stranded wire, steel belt and other forms.

[0085] The movable end seat body 101 is a cylindrical shell, and a movable end moving contact through hole 23 is provided on the cylindrical shell. The movable end seat body 101 is provided with a movable end moving contact through hole 23 that is electrically conductive with the movable end moving contact 11 and through which the movable end moving contact 11 passes. The inner wall of the movable end moving contact through hole 23 is provided with an annular contact finger groove 24 that is symmetrically arranged up and down. Contact fingers are installed in the contact finger groove 24, and the conductive connection between the movable end seat body 101 and the movable end moving contact 11 is realized through the contact fingers. In addition, a ventilation groove 25 is provided on the inner wall of the movable end moving contact through hole 23, and the ventilation groove 25 is located between the two contact finger grooves 24. A plurality of movable end heat dissipation holes 7 are provided on the bottom of the ventilation groove 25. The provision of the movable end heat dissipation holes 7 facilitates the heat dissipation to the outside, avoids the heat accumulation in the movable end moving contact through hole 23, and effectively reduces the temperature rise.

[0086] One end of the arm body 102 is connected to the movable end seat body 101, and the other end is connected to the conductive connection seat 103. The arm body 102 is used to realize the conductive connection between the conductive connection seat 103 and the movable end seat body 101. An outlet seat heat dissipation channel 26 is provided in the arm body 102. One end opening of the outlet seat heat dissipation channel 26 is connected to the inside of the conductive connection seat 103, and the other end opening is connected to the movable end moving contact through hole 23 of the movable end seat body 101, and this opening is provided on the bottom of the ventilation slot 25. The heat at the movable end active cavity 16 can flow into the ventilation slot 25 through the outlet seat heat dissipation channel 26 and be discharged through the movable end heat dissipation hole 7. The heat generated in the movable end moving contact through hole 23 can also flow into the insulating housing 201 through the outlet seat heat dissipation channel 26 and be discharged through the pole heat dissipation hole 22.

[0087] like Fig.11 As shown, in order to facilitate the sliding of the moving end moving contact 11 in the moving end moving contact through-hole 23, a moving end gear 27 is installed at the opening of the outlet seat heat dissipation channel 26 on the ventilation groove 25, and the moving end gear 27 cooperates with the moving end rack 112 arranged along the extension direction of the moving end moving contact 11, so as to realize the up and down movement of the moving end moving contact 11.

[0088] In order to facilitate the control and adjustment of the connection position and the isolation position of the static end isolation structure and the dynamic end isolation structure, the circuit breaker includes a mechanism box 28. The mechanism box 28 controls the rotation of the static end transmission rod 29 and the dynamic end transmission rod 30 to drive the static end rack 502 and the dynamic end rack 112 to move up and down, so as to realize the up and down movement of the static end moving contact 5 and the dynamic end moving contact 11.

[0089] More specifically, the support frame 1 of the circuit breaker is guided and installed on the guide rail at the bottom of the circuit breaker chamber 31 by the running wheels 3 arranged at the bottom of the support frame 1. When the circuit breaker fails, it is convenient to move the circuit breaker out for maintenance. In addition, in this embodiment, the central axis of the arc extinguishing chamber (202) is located on the plane where the central axes of the moving contacts of the two isolation structures are located, which reduces the space occupied by the circuit breaker and thus reduces the volume of the switch cabinet.

[0090] A through moving contact heat dissipation channel is arranged in the moving contacts of the two isolation structures of the circuit breaker of the switch cabinet of the present invention, the static contact seat has an insertion channel for the moving contact to be inserted, and one end of the insertion channel has a moving contact insertion port for the moving contact to be inserted, and the other end has a vent connected to the outside. When the moving contact is in the connection position, the moving contact heat dissipation channel, the plug-in channel and the vent are interconnected, and the airflow will pass through the vent to enter and exit the insertion channel and the moving contact heat dissipation channel, and the heat generated at the moving contact and the static contact seat will be discharged with the airflow. In addition, the vertical arrangement of the isolation structure utilizes the chimney effect, enhances the flow effect, and improves the heat dissipation efficiency of the circuit breaker under natural air cooling conditions. Therefore, under natural air cooling conditions, the switch cabinet reduces the daily maintenance workload of the switch cabinet and improves the reliability of the use of the switch cabinet.

[0091] The specific embodiment 2 of the switch cabinet of the present invention is different from the embodiment 1 described above in that the moving contact is installed on the outlet seat in a horizontally guided and movable manner. In other embodiments, the moving contact can also be installed on the outlet seat in an inclined and guided and movable manner.

[0092] Specific embodiment 3 of the switch cabinet of the present invention is different from embodiment 1 introduced above in that one isolation structure is set, and the isolation structure set is a static end isolation structure. In other embodiments, one isolation structure can be set, and the isolation structure set can be a dynamic end isolation structure or a static end isolation structure.

[0093] Specific embodiment 4 of the switch cabinet of the present invention is different from embodiment 1 described above in that no ventilation groove is arranged in the moving contact through-hole of the moving end, and one end opening of the heat dissipation channel of the outlet seat is directly arranged on the hole wall of the moving contact through-hole of the moving end.

[0094] Specific embodiment 5 of the switch cabinet of the present invention is different from embodiment 1 introduced above in that the moving contacts of the two isolation structures are vertically arranged and the axes of the two moving contacts are collinear. In other embodiments, the two isolation structures can also be arranged at 90 degrees when viewed from above.

[0095] The specific embodiment 6 of the switch cabinet of the present invention is different from the embodiment 1 introduced above in that the arm body of the moving end outlet seat is solid and no heat dissipation channel of the outlet seat is provided.

[0096] The specific embodiment 7 of the switch cabinet of the present invention is different from the embodiment 1 introduced above in that the connection terminal of the stationary contact seat is arranged on the outer peripheral surface of the stationary contact tube column.

[0097] Specific embodiment 8 of the switch cabinet of the present invention is different from embodiment 1 introduced above in that the heat dissipation channel in the moving contact is arranged in a spiral shape. In other embodiments, the shape of the moving contact can be adjusted as needed, for example, it can be L-shaped, T-shaped, etc.

[0098] In a specific embodiment of the circuit breaker of the present invention, the structure of the circuit breaker is the same as the structure of the circuit breaker introduced above, and will not be repeated here.

[0099] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The patent protection scope of the present invention shall be based on the claims. All equivalent structural changes made using the contents of the description and drawings of the present invention should also be included in the protection scope of the present invention.

Claims

1. A circuit breaker, comprising: An arc extinguishing chamber having an external terminal; An isolation structure, the isolation structure is conductively connected to the external terminal of the arc extinguishing chamber, and the isolation structure includes an outlet seat conductively connected to the external terminal, a moving contact guided and moved along a straight line and assembled on the outlet seat, and a stationary contact seat for connecting with the moving contact; The moving contact has a connection position connected with the stationary contact seat and an isolation position disconnected with the stationary contact seat during the linear reciprocating movement. Its characteristic is that the stationary contact seat has an insertion channel for the moving contact to be inserted, one end of the insertion channel has a moving contact insertion port for the moving contact to be inserted, and the other end has a ventilating port connected to the outside; There is a moving contact heat dissipation channel running through the moving contact; The outside of the arc extinguishing chamber is an insulating shell with a pole heat dissipation hole, and the insulating shell has an active cavity for the movement of the moving external terminal; the moving end outlet seat includes a moving end seat body, an arm body with a heat dissipation channel and a conductive connecting seat with a connecting hole, and the seat body is provided with a through hole with a ventilation groove on the inner wall for the moving end moving contact to pass through and a heat dissipation hole arranged at the bottom of the ventilation groove, one end of the heat dissipation channel is opened at the bottom of the ventilation groove, and the other end is connected to the active cavity; a connecting seat heat dissipation hole is provided on the hole wall of the connecting hole, and the opening of the connecting seat heat dissipation hole is directly opposite to the opening of the pole heat dissipation hole.

2. The circuit breaker according to claim 1, characterized in that: The two external ends of the arc extinguishing chamber are arranged up and down, and the moving contact is guided and moved up and down in the vertical direction and assembled on the outlet seat.

3. The circuit breaker according to claim 2, characterized in that: There are two isolation structures, which are conductively connected to the two external ends of the arc extinguishing chamber respectively. The two external ends of the arc extinguishing chamber are a dynamic external end and a static external end respectively. The isolation structure conductively connected to the dynamic external end is the dynamic end isolation structure, and the isolation structure conductively connected to the static external end is the static end isolation structure. In the dynamic end isolation structure, the static contact seat is located at the lower side of the moving contact; in the static end isolation structure, the static contact seat is located at the upper side of the moving contact; the central axis of the arc extinguishing chamber is located on the plane where the central axes of the moving contacts of the two isolation structures are located.

4. The circuit breaker according to claim 1, characterized in that: There are two isolation structures, which are respectively conductively connected to the two external ends of the arc extinguishing chamber. The two external ends of the arc extinguishing chamber are respectively a moving external end and a static external end. The isolation structure conductively connected to the static external end is a static end isolation structure. The seat body is provided with a moving contact through-hole for conductively connecting the moving contact of the moving end isolation structure.

5. The circuit breaker according to any one of claims 1 to 4, characterized in that: The stationary contact seat includes a stationary contact column that is conductive with the moving contact and a wiring terminal for connecting to the busbar. The wiring terminal is connected to one end of the stationary contact column, the insertion channel is arranged in the stationary contact column, and the wiring terminal is arranged at the ventilation port of the stationary contact column.

6. The circuit breaker according to claim 1, 2 or 3, characterized in that: The outlet seat is provided with a moving contact through hole which is electrically conductive with the moving contact and for the moving contact to pass through, and the hole wall of the moving contact through hole is provided with a heat dissipation hole which connects the outside world with the moving contact through hole.

7. The circuit breaker according to any one of claims 1 to 4, characterized in that: The moving contact is a hollow straight tube.

8. A switch cabinet, comprising a cabinet body and a circuit breaker arranged in the cabinet body, characterized in that: The circuit breaker is the circuit breaker according to any one of claims 1 to 7.

Images