Mixed gas insulated metal-enclosed switchgear

Abstract

The invention discloses a mixed gas insulated metal-enclosed switchgear, and relates to the technical field of substation switchgear, the mixed gas insulated metal-enclosed switchgear comprises a box body, a bus chamber, a circuit breaker chamber, a heat dissipation mechanism, a pressure release mechanism and an auxiliary mechanism, the inner cavity of the bus chamber is filled with dry air, the circuit breaker chamber is independently sealed, the heat dissipation mechanism is installed in the inner cavity of the circuit breaker chamber, and the pressure release mechanism is installed in the inner cavity of the circuit breaker chamber. The pressure release mechanism is used for directional pressure release and airflow buffering of mixed gas in an inner cavity of the circuit breaker chamber and impact buffering of power connection points on the circuit breaker chamber, and the auxiliary mechanism is installed on the back face of the circuit breaker chamber. Through the arrangement mode that the bus chamber, the circuit breaker chamber, the heat dissipation mechanism and the pressure release mechanism are matched, the greenhouse effect is reduced, gas liquefaction in the extremely cold environment is prevented, component layering is avoided, the phenomena of overheating and overpressure in the circuit breaker chamber can be avoided, and the insulation performance of gas in an inner cavity of the mixed gas insulation metal-enclosed switchgear is not affected.

Description

Technical Field

[0001] The present invention relates to the technical field of substation switchgear, and particularly relates to a hybrid gas-insulated metal-enclosed switchgear. Background Art

[0002] With the development of the power system towards high voltage and large capacity, gas-insulated metal-enclosed switchgear (GIS) has been widely used in substations and power transmission and distribution systems due to its advantages such as compact structure, high reliability, and low maintenance.

[0003] Traditional GIS equipment usually uses sulfur hexafluoride as the insulating medium. Its excellent insulation and arc extinguishing performance make it the preferred gas for high-voltage switchgear. However, SF6 is a potent greenhouse gas. With the increasingly strict global environmental protection regulations, reducing or replacing the use of SF6 has become an urgent need in the power industry. Currently, research institutions at home and abroad have proposed various SF6 alternative solutions, including using gases such as dry air, nitrogen, fluorinated nitrile or their mixed gases as the insulating medium.

[0004] However, these alternative gases still have certain limitations in terms of insulation performance, arc extinguishing ability, temperature adaptability, etc. For example: problems such as gas stratification, risk of low-temperature liquefaction, and stability of insulating gas pressure. Since some fluorinated gases may liquefy in extremely cold environments, the mixed gas may experience component stratification in a long-term static state, resulting in a decrease in local insulation strength. At the same time, temperature changes or leakage may cause pressure fluctuations, thereby affecting the insulation effect. Existing switchgear lacks active temperature control measures for extremely cold environments, making it difficult to avoid the risk of gas liquefaction and affecting the insulation performance of the equipment. Summary of the Invention

[0005] The purpose of the present invention is to provide a hybrid gas-insulated metal-enclosed switchgear to solve the problems raised in the above background art.

[0006] To achieve the above purpose, the present invention provides the following technical solution: A hybrid gas-insulated metal-enclosed switchgear, comprising:

[0007] A box body;

[0008] A busbar chamber, the inner cavity of which is filled with dry air;

[0009] A circuit breaker chamber, which is independently sealed, and the inner cavity of which is filled with a mixed gas;

[0010] A heat dissipation mechanism, which is installed in the inner cavity of the circuit breaker chamber and is used for heat conduction of the power connection points in the circuit breaker chamber;

[0011] A pressure release mechanism, which is installed at the top of the inner cavity of the circuit breaker chamber. The pressure release mechanism is used for the directional pressure relief of the mixed gas in the inner cavity of the circuit breaker chamber, the airflow buffering, and the impact buffering of the electrical connection point on the circuit breaker chamber.

[0012] An auxiliary mechanism, which is installed on the back of the circuit breaker chamber. The auxiliary mechanism cooperates with the pressure release mechanism to supplement gas to the inner cavity of the circuit breaker chamber.

[0013] Preferably, a grounding switch is installed at the bottom of the box body. The busbar chamber includes:

[0014] A busbar box, which is an independent box installed on the top of the box body. A buzzer is installed on the outer wall of the busbar box;

[0015] A main busbar, which is installed between the busbar box and the circuit breaker chamber;

[0016] The circuit breaker chamber includes:

[0017] A double-layer metal shell, which is installed on the top of the box body;

[0018] A circuit breaker body, which is installed on the inner wall of the double-layer metal shell;

[0019] A static contact, which is installed at one end of the circuit breaker body through a static contact box. The main busbar is connected to the static contact;

[0020] An eddy current stirrer, which is installed at the bottom of the double-layer metal shell. The eddy current stirrer is used for stirring the mixed gas in the inner cavity of the double-layer metal shell.

[0021] Preferably, the heat dissipation mechanism includes:

[0022] An air outlet component, which is horizontally fixed on the inner wall of the double-layer metal shell. The air outlet component includes a fixed pipe and ventilation holes. Both ends of the fixed pipe are fixedly inserted and connected to both sides of the double-layer metal shell, and a plurality of the ventilation holes are opened at both ends of the fixed pipe;

[0023] A heat dissipation component, which is fixed between the static contact and the air outlet component. The heat dissipation component includes a heat dissipation block and a communication groove; the communication groove is opened at one end of the heat dissipation block, and the heat dissipation block is used for heat conduction at one end of the static contact;

[0024] A communication pipe, which is fixedly inserted between the heat dissipation block and the fixed pipe. The communication groove, the communication pipe, the fixed pipe and the ventilation holes form a connected independent heat dissipation channel;

[0025] A disc spring, which is installed between the heat dissipation block and the main busbar.

[0026] Preferably, the pressure release mechanism includes:

[0027] A positioning component, which is installed on the top of the double-layer metal housing;

[0028] An explosion-proof component, which is arranged on the top of the positioning component;

[0029] A swing component, which is installed in the middle of the positioning component and is used to push air into the auxiliary mechanism;

[0030] A buffer component, which is installed between the positioning component and the static contact;

[0031] A push-button switch, which is installed in the inner cavity of the positioning component.

[0032] Preferably, the positioning component includes:

[0033] A positioning cylinder, which is fixedly inserted through the top of the double-layer metal housing;

[0034] A connecting cylinder, which is fixed to the bottom of the positioning cylinder;

[0035] A ventilation hole, which is opened at the bottom of the connecting cylinder;

[0036] A piston, which slides in the inner cavity of the connecting cylinder due to air pressure changes;

[0037] A push rod, which is fixed to the middle of the piston and is slidably inserted and connected with the bottom of the positioning cylinder;

[0038] A first compression spring, which is fixed between the piston and the positioning cylinder.

[0039] Preferably, the explosion-proof component includes:

[0040] A connecting cover, which is threadedly connected to the top of the positioning cylinder;

[0041] A bursting disc, which is clamped between the top of the positioning cylinder and the connecting cover;

[0042] A movable frame, which is slidably inserted through one side of the connecting cover;

[0043] A protective cover, which is fixed to the top of the movable frame and is arranged directly above the bursting disc;

[0044] An air flow induction switch, which is fixed to the inner wall of the protective cover and is electrically connected to the buzzer.

[0045] Preferably, the swing component includes:

[0046] A rotating rod, which is rotatably inserted through the bottom of the positioning cylinder by means of a sealed bearing;

[0047] A swing rod, which is fixed to one end of the rotating rod;

[0048] A pressing block, which is fixed to the middle of the rotating rod;

[0049] A connecting rod, which is fixedly inserted through one side of the pressing block;

[0050] A counterweight block, which is fixed to the other side of the pressing block;

[0051] A limiting frame, which is fixed to the inner cavity of the positioning cylinder, and the two ends of the rotating rod are rotatably inserted and connected to the bottom of the limiting frame.

[0052] Preferably, the buffer assembly includes:

[0053] A fixing frame, which is fixed to the outer wall of the positioning cylinder;

[0054] A corrugated pipe, which is fixed to the bottom of the fixing frame;

[0055] A second compression spring, which is fixed to the inner cavity of the corrugated pipe;

[0056] A clamping frame, which is fixed to the other end of the corrugated pipe, and the clamping frame is inserted and clamped on the outer wall of the static contact.

[0057] Preferably, the auxiliary mechanism includes:

[0058] A dispensing box, which is fixed to the back of the box body;

[0059] An electromagnetic valve, which is installed on the inner wall of the double-layer metal shell through a pipeline;

[0060] A mechanical air intake assembly, which enables the mixed gas in the inner cavity of the dispensing box to enter the inner cavity of the double-layer metal shell through the push of the swing assembly;

[0061] A sliding cylinder, which is fixed to one end of the mechanical air intake assembly;

[0062] A fourth compression spring, which is fixed to one end of the inner wall of the sliding cylinder;

[0063] A push rod, which is sleeved in the inner cavity of the fourth compression spring, and the push rod is slidably inserted and connected to the inner cavity of the sliding cylinder.

[0064] Preferably, the mechanical air intake assembly includes:

[0065] A fixing block, which is fixedly inserted between the dispensing box and the double-layer metal shell;

[0066] Interpenetrating holes, a plurality of the interpenetrating holes are arranged in an annular array on the fixed block;

[0067] The third compression spring, the third compression spring is fixed to one end of the inner wall of the interpenetrating hole;

[0068] The interpenetrating rod, the interpenetrating rod slides through the inner cavity of the interpenetrating hole, and one end of the third compression spring is fixedly connected to the middle of the interpenetrating rod;

[0069] The plug, a plurality of the plugs are respectively fixed to both ends of a plurality of interpenetrating rods, and the plug is used for sealing the middle and one end of the interpenetrating hole;

[0070] The push plate, the push plate is fixed to one end of a plurality of the interpenetrating rods.

[0071] The technical effects and advantages of the present invention:

[0072] (1) Through the cooperation of the busbar chamber, the circuit breaker chamber, the heat dissipation mechanism and the pressure release mechanism, the present invention reduces the consumption of SF6 through the mixed gas, reduces the greenhouse effect, and the double-layer metal shell design combined with the heating layer prevents gas liquefaction in extremely cold environments. And an internal eddy current stirrer is provided to force the mixed gas to circulate and avoid component stratification. The settings of the heat dissipation mechanism and the pressure release mechanism enable it to avoid overheating and overpressure phenomena in the circuit breaker chamber, improve the stability of the mixed gas, and do not affect the insulation performance of the gas in the inner cavity of the gas-insulated metal-enclosed switchgear;

[0073] (2) The present invention utilizes the heat dissipation mechanism to enable the connection point between the main busbar and the static contact to dissipate heat quickly, and forms an independent heat dissipation channel isolated from the insulating gas, avoiding heat exchange from affecting the gas performance. At the same time, the cooperation of the disc spring on the heat dissipation mechanism and the buffer component on the pressure release mechanism can reduce the mechanical impact damage to the electrical connection point between the main busbar and the static contact, and improve the connection stability of the electrical connection point between the main busbar and the static contact;

[0074] (3) Through the cooperation of the pressure release mechanism and the auxiliary mechanism, the present invention realizes two-way adjustment by using the pressure release mechanism. When overpressure occurs, the bursting disc relieves pressure, and when the pressure is low, the mechanical / electromagnetic dual-path air replenishment is triggered through the swing component, ensuring that the air pressure can still be maintained stable during power failure or failure.

[0075] (4) The present invention utilizes the pressure release mechanism to enable its explosion-proof component to protect the air flow, prevent the high-speed air flow generated during the pressure relief process from damaging the surrounding equipment, and the air flow induction switch is linked with the buzzer to alarm gas leakage or abnormal pressure relief in real time. At the same time, the bursting disc adopts a threaded connection cover design, which is convenient for the quick replacement of the bursting disc and facilitates the quick realization of the air pressure stability of the mixed gas in the circuit breaker chamber. Description of the Drawings

[0076] Figure 1This is a schematic diagram of the overall structure of the present invention.

[0077] Figure 2 This is a schematic diagram of the overall side structure of the present invention.

[0078] Figure 3 This is a schematic diagram of the side sectional structure of the double-layer metal housing of the present invention.

[0079] Figure 4 This is a schematic diagram of the side sectional structure at the fixed block of the present invention.

[0080] Figure 5 This is a schematic diagram of the overall structure at the connection cover of the present invention.

[0081] Figure 6 This is a schematic diagram of the side sectional structure at the positioning cylinder of the present invention.

[0082] Figure 7 This is a schematic diagram of the overall structure at the pressing block of the present invention.

[0083] Figure 8 This is the present invention Figure 3 A partial enlarged structure schematic diagram at position A in the present invention.

[0084] Figure 9 This is the present invention Figure 3 A partial enlarged structure schematic diagram at position B in the present invention.

[0085] In the figure: 1. Box body; 2. Busbar chamber; 21. Busbar box; 22. Main busbar; 3. Circuit breaker chamber; 31. Double-layer metal housing; 32. Circuit breaker body; 33. Static contact; 34. Eddy current stirrer; 4. Heat dissipation mechanism; 41. Air outlet assembly; 411. Fixed pipe; 412. Ventilation hole; 42. Heat dissipation assembly; 421. Heat dissipation block; 422. Communication groove; 43. Communication pipe; 44. Disc spring; 5. Pressure release mechanism; 51. Positioning assembly; 511. Positioning cylinder; 512. Connection cylinder; 513. Ventilation hole; 514. Piston; 515. Thrust rod; 516. First compression spring; 52. Explosion-proof assembly; 521. Connection cover; 522. Blasting film; 523. Movable frame; 524. Protective cover; 525. Air flow induction switch; 53. Swing assembly; 531. Rotating rod; 532. Swing rod; 533. Pressing block; 534. Connecting rod; 535. Counterweight; 536. Limiting frame; 54. Buffer assembly; 541. Fixed frame; 542. Bellows; 543. Second compression spring; 544. Clamping frame; 55. Push-button switch; 6. Auxiliary mechanism; 61. Dispensing box; 62. Solenoid valve; 63. Mechanical air intake assembly; 631. Fixed block; 632. Interpenetrating hole; 633. Third compression spring; 634. Interpenetrating rod; 635. Plug; 636. Push plate; 64. Slide cylinder; 65. Fourth compression spring; 66. Push rod; 7. Earthing switch; 8. Buzzer. Detailed implementation manners

[0086] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0087] The present invention provides a Figures 1-9 hybrid gas-insulated metal-enclosed switchgear as shown, including a box body 1, a busbar chamber 2, a circuit breaker chamber 3, a heat dissipation mechanism 4, a pressure relief mechanism 5 and an auxiliary mechanism 6. The inner cavity of the busbar chamber 2 is filled with dry air. The circuit breaker chamber 3 is independently sealed, and the inner cavity of the circuit breaker chamber 3 is filled with a mixed gas composed of SF6, N2, and C4F7N gases. The heat dissipation mechanism 4 is installed in the inner cavity of the circuit breaker chamber 3 and is used for heat conduction of the electrical connection points in the circuit breaker chamber 3. The pressure relief mechanism 5 is installed at the top of the inner cavity of the circuit breaker chamber 3 and is used for directional pressure relief of the mixed gas in the inner cavity of the circuit breaker chamber 3, air flow buffering, and impact buffering of the electrical connection points on the circuit breaker chamber 3. The auxiliary mechanism 6 is installed on the back of the circuit breaker chamber 3, and the auxiliary mechanism 6 cooperates with the pressure relief mechanism 5 to supplement gas to the inner cavity of the circuit breaker chamber 3, preventing the phenomenon of local insulation strength reduction in the inner cavity of the circuit breaker chamber 3 due to cold shrinkage at low temperatures.

[0088] Among them, a grounding switch is installed at the bottom of the box body 1. The busbar chamber 2 includes a busbar box 21 and a main busbar 22. The busbar box 21 is an independent box installed on the top of the box body 1. The inner cavity of the busbar box 21 is filled with dry air. A buzzer 8 is installed on the outer wall of the busbar box 21. The main busbar 22 is installed between the busbar box 21 and the circuit breaker chamber 3;

[0089] The circuit breaker chamber 3 includes a double-layer metal housing 31, a circuit breaker body 32, a static contact 33, and an eddy current stirrer 34. The double-layer metal housing 31 is installed on the top of the box body 1. The double-layer metal housing 31 is a closed rectangular box, and the outer layer of the double-layer metal housing 31 is made of stainless steel, and the inner layer is made of aluminum alloy, which can reduce eddy current loss. A heating layer is installed between the outer layer and the inner layer for heating the inner cavity of the circuit breaker chamber 3, which is suitable for preventing the liquefaction of the mixed gas in the inner cavity of the double-layer metal housing 31 in extremely cold weather. The circuit breaker body 32 is installed on the inner wall of the double-layer metal housing 31. The static contact 33 is installed at one end of the circuit breaker body 32 through a static contact box. The main bus 22 is connected to the static contact 33. The eddy current stirrer 34 is installed at the bottom of the double-layer metal housing 31. The eddy current stirrer 34 is used for stirring the mixed gas in the inner cavity of the double-layer metal housing 31. The eddy current stirrer 34 can stir the gas in the inner cavity of the double-layer metal housing 31 to prevent the gas components from stratifying and improve the gas insulation performance of the inner cavity of the double-layer metal housing 31. A sensor module is built into the inner cavity of the double-layer metal housing 31 for gas monitoring of the gas concentration, humidity, and pressure in the inner cavity of the circuit breaker chamber 3.

[0090] In addition, the heat dissipation mechanism 4 includes an air outlet component 41, a heat dissipation component 42, a connecting pipe 43, and a butterfly spring 44. The air outlet component 41 is horizontally fixed on the inner wall of the double-layer metal housing 31. The air outlet component 41 includes a fixed pipe 411 and ventilation holes 412. Both ends of the fixed pipe 411 are fixedly inserted and connected to both sides of the double-layer metal housing 31. A plurality of ventilation holes 412 are opened at both ends of the fixed pipe 411. The heat dissipation component 42 is fixed between the static contact 33 and the air outlet component 41. The heat dissipation component 42 includes a heat dissipation block 421 and a communication groove 422. The heat dissipation block 421 is an insulating cylindrical block with fins. The communication groove 422 is opened at one end of the heat dissipation block 421. The heat dissipation block 421 is used for heat conduction at one end of the static contact 33. The connection point between the static contact 33 and the busbar is prone to heat generation. Through the contact between the static contact 33 and the heat dissipation block 421, its heat can be transferred to the heat dissipation block 421. The connecting pipe 43 is fixedly inserted between the heat dissipation block 421 and the fixed pipe 411. The communication groove 422, the connecting pipe 43, the fixed pipe 411, and the ventilation holes 412 form a connected independent heat dissipation channel, which facilitates the heat on the heat dissipation block 421 to be dissipated not only through the outer wall fins but also through the air flowing in convection at both ends of the fixed pipe 411. Moreover, the inner cavities of the communication groove 422, the connecting pipe 43, the fixed pipe 411, and the ventilation holes 412 are not in communication with the air in the inner cavity of the double-layer metal housing 31, so as not to affect the mixed gas in the inner cavity of the double-layer metal housing 31. The butterfly spring 44 is installed between the heat dissipation block 421 and the main bus 22. The setting of the butterfly spring 44 can avoid the impact damage between the main bus 22 and the heat dissipation block 421 in earthquake-prone areas or areas with strong earthquake movement.

[0091] Further, the pressure release mechanism 5 includes a positioning component 51, an explosion-proof component 52, a swing component 53, a buffer component 54, and a push-button switch 55. The positioning component 51 is installed at the top of the double-layer metal housing 31. The explosion-proof component 52 is arranged on the top of the positioning component 51. The swing component 53 is installed in the middle of the positioning component 51. The swing component 53 is used to push air into the auxiliary mechanism 6. The buffer component 54 is installed between the positioning component 51 and the static contact 33. The push-button switch 55 is installed in the inner cavity of the positioning component 51. The setting of the pressure release mechanism 5 can enable the stable use of the mixed gas in the inner cavity of the circuit breaker chamber 3 and reduce the impact buffer between the main bus 22 and the static contact 33.

[0092] Specifically, the positioning component 51 includes a positioning cylinder 511, a connecting cylinder 512, a ventilation hole 513, a piston 514, a push rod 515, and a first compression spring 516. The positioning cylinder 511 is fixedly inserted through the top of the double-layer metal housing 31. The connecting cylinder 512 is fixed to the bottom of the positioning cylinder 511. The ventilation hole 513 is opened at the bottom of the connecting cylinder 512, facilitating the circulation of the mixed gas in the inner cavity of the double-layer metal housing 31 through the ventilation hole 513 at the bottom of the inner cavity of the connecting cylinder 512, and the air pressure in the inner cavity of the double-layer metal housing 31 is the same as the air pressure at the bottom of the inner cavity of the connecting cylinder 512. The piston 514 slides in the inner cavity of the connecting cylinder 512 due to air pressure changes. The push rod 515 is fixed to the middle of the piston 514. The push rod 515 is slidably inserted and connected to the bottom of the positioning cylinder 511. The first compression spring 516 is fixed between the piston 514 and the positioning cylinder 511, and the first compression spring 516 is sleeved on the outer wall bottom of the push rod 515, so that the piston 514 will not move randomly;

[0093] Meanwhile, the explosion-proof component 52 includes a connection cover 521, a bursting disc 522, a movable frame 523, a protective cover 524, and an air flow induction switch 525. The connection cover 521 is threadedly connected to the top of the positioning cylinder 511. The bursting disc 522 is clamped between the top of the positioning cylinder 511 and the connection cover 521. The bursting disc 522 is a non-reusable membrane body. When the air pressure in the inner cavity of the double-layer metal housing 31 is over-pressurized, the molecular kinetic energy of the insulating gas increases, and the gas pressure rises accordingly. The piston 514 is pushed by the air pressure, so that the top of its ejector rod 515 can pierce the bursting disc 522 to relieve pressure, which can prevent the double-layer metal housing 31 from bursting. Moreover, the inside of the connection cover 521 is of a circular ring structure, which is convenient for quickly replacing the bursting disc 522 by rotating the connection cover 521 and the positioning cylinder 511 in a threaded manner. The movable frame 523 slides through one side of the connection cover 521, and the protective cover 524 is fixed to the top of the movable frame 523. The protective cover 524 is arranged directly above the bursting disc 522. Through the sliding of the movable frame 523, the protective cover 524 has a certain rising space when it is impacted by air pressure. And through the setting of the protective cover 524, it can prevent the air pressure from concentrating above the break of the bursting disc 522 and prevent the high-speed air flow generated during the pressure relief process from damaging the surrounding equipment. The air flow induction switch 525 is fixed to the inner wall of the protective cover 524, and the air flow induction switch 525 is electrically connected to the buzzer 8. When the air flow induction switch 525 is impacted by air flow, it triggers the switch of the buzzer 8, so that the buzzer 8 can beep, which is convenient for timely reminding the staff that an abnormal phenomenon occurs in the circuit breaker chamber 3.

[0094] The swing component 53 includes a rotating rod 531, a swing rod 532, a pressing block 533, a connecting rod 534, a counterweight 535, and a limiting frame 536. The rotating rod 531 rotates through the bottom of the positioning cylinder 511 through a sealing bearing. The swing rod 532 is fixed to one end of the rotating rod 531. The pressing block 533 is fixed to the middle of the rotating rod 531. The pressing block 533 is arranged at the bottom of the inner cavity of the positioning cylinder 511. The connecting rod 534 is fixedly inserted through one side of the pressing block 533, and the counterweight 535 is fixed to the other side of the pressing block 533. The limiting frame 536 is fixed to the inner cavity of the positioning cylinder 511, and both ends of the rotating rod 531 are rotatably inserted and connected to the bottom of the limiting frame 536. Through the setting of the counterweight 535, the connecting rod 534 and the counterweight 535 can be kept in a balanced state without external pressure. When the air pressure in the inner cavity of the double-layer metal housing 31 is low or leaks, the piston 514 drives the ejector rod 515 to move downward, so that the structure on the ejector rod 515 can press down one side of the pressing block 533, which is convenient for the pressing block 533 to rotate, so that the connecting rod 534 can press down the push-button switch 55 to trigger the switch of the solenoid valve 62 on the auxiliary mechanism 6, and synchronously the swing rod 532 rotates to push the mechanical air intake component 63 on the auxiliary mechanism 6, so that it can assist the solenoid valve 62 to intake air.

[0095] More specifically, the buffer assembly 54 includes a fixing frame 541, a corrugated pipe 542, a second compression spring 543 and a clamping frame 544. The fixing frame 541 is fixed to the outer wall of the positioning cylinder 511. The corrugated pipe 542 is fixed to the bottom of the fixing frame 541. The second compression spring 543 is fixed to the inner cavity of the corrugated pipe 542. The clamping frame 544 is fixed to the other end of the corrugated pipe 542. The clamping frame 544 is made of an insulating plate frame material and is inserted and clamped on the outer wall of the static contact 33. Through the elasticity of the second compression spring 543, it is convenient to improve the telescopic performance of the corrugated pipe 542, so that it can have a certain pressing elasticity on the clamping frame 544, and reduce the impact damage of the main bus 22 on the static contact box on the static contact 33.

[0096] Further, the auxiliary mechanism 6 includes a dispensing box 61, a solenoid valve 62, a mechanical air intake assembly 63, a sliding cylinder 64, a fourth compression spring 65 and a push rod 66. The dispensing box 61 is fixed to the back of the box body 1. The inner cavity of the dispensing box 61 is filled with a mixed gas, and through the air inlet at the bottom of the dispensing box 61, it is convenient to inject gas into the inner cavity of the circuit breaker chamber 3. The solenoid valve 62 is installed on the inner wall of the double-layer metal shell 31 through a pipeline, and the pipeline is communicated with the inner cavity of the dispensing box 61. The solenoid valve 62 is electrically connected to the push-button switch 55. The push-button switch 55 can trigger the solenoid valve 62 to open and close, so that the gas in the inner cavity of the dispensing box 61 can enter the inner cavity of the double-layer metal shell 31 through the solenoid valve 62. The mechanical air intake assembly 63 makes the mixed gas in the inner cavity of the dispensing box 61 enter the inner cavity of the double-layer metal shell 31 through the push of the swing assembly 53. The sliding cylinder 64 is fixed to one end of the mechanical air intake assembly 63. The fourth compression spring 65 is fixed to one end of the inner wall of the sliding cylinder 64. The push rod 66 is sleeved in the inner cavity of the fourth compression spring 65, and the push rod 66 is slidably inserted and connected with the inner cavity of the sliding cylinder 64. When the air pressure in the inner cavity of the double-layer metal shell 31 drops, the swing rod 532 swings towards the push rod 66 and pushes the push rod 66, so that the fourth compression spring 65 is in a compressed state, which is convenient for the push rod 66 to push the mechanical air intake assembly 63 to intake air, preventing air intake from not being possible through the solenoid valve 62 in the case of power failure, so that the mechanical air intake assembly 63 can assist in air intake and improve the stability of air intake.

[0097] Specifically, the mechanical intake assembly 63 includes a fixing block 631, an insertion hole 632, a third compression spring 633, an insertion rod 634, a plug 635 and a push plate 636. The fixing block 631 is fixedly inserted between the dispensing box 61 and the double-layer metal housing 31. The sliding cylinder 64 is fixed to one end of the fixing block 631 close to the double-layer metal housing 31. The push rod 66 is slidably inserted into the middle of the sliding cylinder 64. A plurality of insertion holes 632 are arranged in a circular array on the fixing block 631. The third compression spring 633 is fixed to one end of the inner wall of the insertion hole 632. The insertion rod 634 is slidably inserted into the inner cavity of the insertion hole 632. One end of the third compression spring 633 is fixedly connected to the middle of the insertion rod 634. A plurality of plugs 635 are respectively fixed to both ends of the plurality of insertion rods 634. The plug 635 is used to block the middle and one end of the insertion hole 632. The push plate 636 is fixed to one end of the plurality of insertion rods 634. Through the elasticity of the third compression spring 633, it is convenient to elastically pull the push plate 636, so that the push plate 636 is in a state of being closely attached to the fixing block 631 when not pushed by the push rod 66. And the plug 635 can block the middle and one end of the insertion hole 632. And a sealing gasket is fixed on the surface of the push plate 636 close to the double-layer metal housing 31, which is convenient to seal and block the hole through which the push rod 66 slides, preventing the gas in the inner cavity of the dispensing box 61 from entering the inner cavity of the double-layer metal housing 31 randomly. When the push rod 66 is pushed, the push plate 636 is pushed, and a plurality of plugs 635 are away from the middle and one end of the insertion hole 632, so that the gas can enter the inner cavity of the double-layer metal housing 31 through the insertion hole 632, making the air pressure in the circuit breaker chamber 3 balanced, and used for the gas insulation of the gas-insulated metal-enclosed switchgear.

[0098] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A gas-insulated metal-enclosed switchgear, characterized in that, Comprising: A box body (1); A busbar chamber (2), the inner cavity of the busbar chamber (2) being filled with dry air; A circuit breaker chamber (3), the circuit breaker chamber (3) being independently sealed, and the inner cavity of the circuit breaker chamber (3) being filled with a mixed gas; A heat dissipation mechanism (4), the heat dissipation mechanism (4) being installed in the inner cavity of the circuit breaker chamber (3), and the heat dissipation mechanism (4) being used for heat conduction of the power connection points in the circuit breaker chamber (3); A pressure relief mechanism (5), the pressure relief mechanism (5) being installed at the top of the inner cavity of the circuit breaker chamber (3), and the pressure relief mechanism (5) being used for directional pressure relief of the mixed gas in the inner cavity of the circuit breaker chamber (3), air flow buffering, and impact buffering of the power connection points on the circuit breaker chamber (3); An auxiliary mechanism (6), the auxiliary mechanism (6) being installed on the back of the circuit breaker chamber (3), and the auxiliary mechanism (6) cooperating with the pressure relief mechanism (5) to supplement gas to the inner cavity of the circuit breaker chamber (3).

2. The hybrid gas-insulated metal-enclosed switchgear according to claim 1, wherein A grounding switch is installed at the bottom of the box body (1), and the busbar chamber (2) includes: A busbar box (21), the busbar box (21) being an independent box installed on the top of the box body (1), and a buzzer (8) being installed on the outer wall of the busbar box (21); A main busbar (22), the main busbar (22) being installed between the busbar box (21) and the circuit breaker chamber (3); The circuit breaker chamber (3) includes: A double-layer metal shell (31), the double-layer metal shell (31) being installed on the top of the box body (1); A circuit breaker body (32), the circuit breaker body (32) being installed on the inner wall of the double-layer metal shell (31); A static contact (33), the static contact (33) being installed at one end of the circuit breaker body (32) through a static contact box, and the main busbar (22) being connected to the static contact (33); An eddy current stirrer (34), the eddy current stirrer (34) being installed at the bottom of the double-layer metal shell (31), and the eddy current stirrer (34) being used for stirring the mixed gas in the inner cavity of the double-layer metal shell (31).

3. A gas-insulated metal-enclosed switchgear according to claim 2, wherein, The heat dissipation mechanism (4) includes: An air outlet component (41), the air outlet component (41) being horizontally fixed to the inner wall of the double-layer metal shell (31), the air outlet component (41) including a fixed pipe (411) and ventilation holes (412), both ends of the fixed pipe (411) being fixedly inserted and connected to both sides of the double-layer metal shell (31), and a plurality of the ventilation holes (412) being opened at both ends of the fixed pipe (411); A heat dissipation component (42), the heat dissipation component (42) being fixed between the static contact (33) and the air outlet component (41), the heat dissipation component (42) including a heat dissipation block (421) and a communication groove (422); the communication groove (422) being opened at one end of the heat dissipation block (421), and the heat dissipation block (421) being used for heat conduction at one end of the static contact (33); A communication pipe (43), the communication pipe (43) being fixedly inserted between the heat dissipation block (421) and the fixed pipe (411), and the communication groove (422), the communication pipe (43), the fixed pipe (411), and the ventilation holes (412) form a connected independent heat dissipation channel; A disc spring (44), and the disc spring (44) is installed between the heat sink (421) and the main bus bar (22).

4. A gas-insulated metal-enclosed switchgear according to claim 2, characterized in that, The pressure release mechanism (5) includes: A positioning component (51), and the positioning component (51) is installed on the top of the double-layer metal housing (31); An explosion-proof component (52), and the explosion-proof component (52) is arranged on the top of the positioning component (51); A swing component (53), and the swing component (53) is installed in the middle of the positioning component (51), and the swing component (53) is used for pushing air into the auxiliary mechanism (6); A buffer component (54), and the buffer component (54) is installed between the positioning component (51) and the static contact (33); A push-button switch (55), and the push-button switch (55) is installed in the inner cavity of the positioning component (51).

5. The hybrid gas-insulated metal-enclosed switchgear according to claim 4, characterized in that, The positioning component (51) includes: A positioning cylinder (511), and the positioning cylinder (511) is fixedly inserted through the top of the double-layer metal housing (31); A connecting cylinder (512), and the connecting cylinder (512) is fixed to the bottom of the positioning cylinder (511); A ventilation hole (513), and the ventilation hole (513) is opened at the bottom of the connecting cylinder (512); A piston (514), and the piston (514) slides in the inner cavity of the connecting cylinder (512) due to air pressure changes; A push rod (515), and the push rod (515) is fixed to the middle of the piston (514), and the push rod (515) is slidably inserted and connected to the bottom of the positioning cylinder (511); A first compression spring (516), and the first compression spring (516) is fixed between the piston (514) and the positioning cylinder (511).

6. A gas-insulated metal-enclosed switchgear according to claim 5, characterized in that, The explosion-proof component (52) includes: A connecting cover (521), and the connecting cover (521) is threadedly connected to the top of the positioning cylinder (511); A bursting disc (522), and the bursting disc (522) is clamped between the top of the positioning cylinder (511) and the connecting cover (521); A movable frame (523), and the movable frame (523) is slidably inserted through one side of the connecting cover (521); A protective cover (524), and the protective cover (524) is fixed to the top of the movable frame (523), and the protective cover (524) is arranged directly above the bursting disc (522); An air flow induction switch (525), and the air flow induction switch (525) is fixed to the inner wall of the protective cover (524), and the air flow induction switch (525) is electrically connected to the buzzer (8).

7. A gas-insulated metal-enclosed switchgear according to claim 5, wherein, The swing component (53) includes: A rotating rod (531), and the rotating rod (531) is rotatably inserted through the bottom of the positioning cylinder (511) through a sealed bearing; A swing rod (532), and the swing rod (532) is fixed to one end of the rotating rod (531); A pressing block (533), and the pressing block (533) is fixed to the middle of the rotating rod (531); A connecting rod (534), and the connecting rod (534) is fixedly inserted through one side of the pressing block (533); A counterweight block (535), and the counterweight block (535) is fixed to the other side of the pressing block (533); The limit frame (536) is fixed inside the positioning cylinder (511), and both ends of the rotating rod (531) are rotatably inserted through the bottom of the limit frame (536).

8. A gas-insulated metal-enclosed switchgear according to claim 5, characterized in that, The buffer assembly (54) includes: A fixed frame (541) fixed to the outer wall of the positioning cylinder (511); A bellows (542) fixed to the bottom of the fixed frame (541); A second compression spring (543) fixed inside the bellows (542); A clamping frame (544) fixed to the other end of the bellows (542), and the clamping frame (544) is inserted and clamped on the outer wall of the static contact (33).

9. A gas-insulated metal-enclosed switchgear according to claim 4, wherein, The auxiliary mechanism (6) includes: A dispensing box (61) fixed to the back of the box body (1); An electromagnetic valve (62) installed on the inner wall of the double-layer metal shell (31) through a pipeline; A mechanical air intake assembly (63) that enables the mixed gas inside the dispensing box (61) to enter the inner cavity of the double-layer metal shell (31) through the push of the swing assembly (53); A sliding cylinder (64) fixed to one end of the mechanical air intake assembly (63); A fourth compression spring (65) fixed to one end of the inner wall of the sliding cylinder (64); A push rod (66) sleeved inside the fourth compression spring (65), and the push rod (66) is slidably inserted through the inner cavity of the sliding cylinder (64).

10. A gas-insulated metal-enclosed switchgear according to claim 9, wherein, The mechanical air intake assembly (63) includes: A fixed block (631) fixedly inserted between the dispensing box (61) and the double-layer metal shell (31); Interpolation holes (632), and a plurality of the interpolation holes (632) are arranged in a circular array on the fixed block (631); A third compression spring (633) fixed to one end of the inner wall of the interpolation hole (632); An interpolation rod (634) slidably inserted through the inner cavity of the interpolation hole (632), and one end of the third compression spring (633) is fixedly connected to the middle of the interpolation rod (634); Plug heads (635), and a plurality of the plug heads (635) are respectively fixed to both ends of a plurality of the interpolation rods (634), and the plug heads (635) are used to block the middle and one end of the interpolation hole (632); A push plate (636) fixed to one end of a plurality of the interpolation rods (634).

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