A device for preventing low-temperature cracking of a sealing gasket of a sulfur hexafluoride electrical equipment

Abstract

This invention relates to the field of sealing and leak prevention technology, specifically a device for preventing low-temperature cracking of gaskets in sulfur hexafluoride (SF6) electrical equipment. The device includes a gas supply end and a connecting pipe, with a sealing gas supply mechanism installed between them. The connecting pipe connects to the gas chamber docking end, and an external circulation mechanism is provided on both the gas supply end and the connecting pipe. The sealing gas supply mechanism includes a first disc fixed to the gas supply end and the connecting pipe, which is locked to a second disc by a nut. The second disc is symmetrically fixed to a central pipe. In this invention, the pre-compressed elastic ring of the outer leak prevention mechanism can autonomously release its elastic potential energy to push outward and compensate in low-temperature environments, effectively offsetting the leakage risks caused by the shrinkage of low-temperature materials. Simultaneously, it works with the sealing gas supply mechanism to form a double-layer sealing structure, further preventing sealing failure and gas leakage, and improving sealing reliability under low-temperature conditions.

Description

Technical Field

[0001] This invention belongs to the field of sealing and leak prevention technology, specifically relating to a device for preventing low-temperature cracking of gaskets in sulfur hexafluoride electrical equipment. Background Technology

[0002] Sulfur hexafluoride (SF6) electrical equipment is widely used in power transmission and transformation systems. It relies on the excellent insulation and arc-quenching properties of SF6 gas to ensure the safe and stable operation of the equipment. Gaskets are generally used at the connection points of the equipment pipelines to achieve airtight sealing and prevent SF6 gas leakage. This type of sealing structure directly determines the operational safety and sealing performance of the electrical equipment and is often used in complex working environments such as outdoor substations and high-altitude cold regions.

[0003] Most existing sulfur hexafluoride (SF6) electrical equipment piping seals use a single-layer gasket sealing structure, relying solely on the gasket's own compression deformation for sealing protection. In low-temperature and frigid environments, the gasket is prone to cold shrinkage, hardening, and brittle deformation, creating tiny gaps at the pipe connection sealing surfaces and easily leading to SF6 gas leakage. Furthermore, traditional conveying structures add coils for heating or insulation at pipe connections to prevent leakage in low-temperature environments. However, this heating structure suffers from concentrated heat sources and uneven heat dissipation, easily leading to localized overheating and aging, and localized low-temperature condensation. Condensation inside the cavity will corrode the gasket over time, accelerating its aging and failure. Prolonged use significantly reduces the equipment's sealing reliability, increases the risk of electrical equipment failure, and raises maintenance costs. Therefore, a device is needed to prevent low-temperature cracking of SF6 electrical equipment gaskets. Summary of the Invention

[0004] The purpose of this invention is to provide a device with a simple structure and reasonable design to prevent low-temperature cracking of gaskets in sulfur hexafluoride electrical equipment in order to solve the above-mentioned problems.

[0005] The present invention achieves the above objectives through the following technical solutions: A device for preventing low-temperature cracking of gaskets in sulfur hexafluoride electrical equipment includes a gas supply end and a connecting pipe. A sealing gas supply mechanism is provided between the gas supply end and the connecting pipe. The connecting pipe is connected to the gas chamber docking end. An external circulation mechanism is provided on the gas supply end and the connecting pipe. The sealing gas supply mechanism includes a first disc fixed on the gas supply end and the connecting pipe. The first disc is locked onto a second disc by a nut. The second disc is symmetrically fixed on a central pipe. The two ends of the central pipe are respectively connected to the gas supply end and the connecting pipe. Annular sealing gaskets are provided in the annular grooves opened at both ends of the central pipe. The annular sealing gaskets at both ends of the central pipe are respectively pressed tightly into the grooves at the ends of the gas supply end and the connecting pipe. An outer leak-proof mechanism is provided on the second disc, and a heating circulation mechanism is provided on the central pipe.

[0006] As a further optimization of the present invention, the outer leak-proof mechanism includes a support platform fixed on the second disc body, a tension ring slidably connected to the support platform, a sealing ring sleeved on the inner wall of the tension ring, and an elastic pad provided between the support platform and the tension ring.

[0007] As a further optimization of the present invention, a tensioning screw is threadedly connected to the tensioning ring, and the tensioning screw is rotatably connected to the second disc.

[0008] As a further optimization of the present invention, the tensioning ring is provided with a bucket-shaped shell, a sealing layer is fixed on the inner wall of the bucket-shaped shell, an elastic ring is abutted on the sealing layer, and the elastic ring is fixed on the air supply end and the connecting pipe.

[0009] As a further optimization of the present invention, the heating circulation mechanism includes mounting platforms symmetrically arranged on the central tube, a support sleeve fixed on the mounting platform, and an electromagnetic coil wound on the support sleeve.

[0010] As a further optimization of the present invention, a connecting plate is rotatably connected to one side of the mounting platform, a magnetic core bracket is fixed on the connecting plate, and permanent magnet blocks are fixed in the grooves evenly opened on the inner wall of the magnetic core bracket.

[0011] As a further optimization of the present invention, the magnetic core support is arranged coaxially with the electromagnetic coil, and the electromagnetic coil on one side is located inside the magnetic core support, and a circulating impeller is fixed on the magnetic core support.

[0012] As a further optimization of the present invention, the external circulation mechanism includes an external support sleeved on the air delivery end and the connecting pipe, an inner ring shell fixed on the inner wall of the external support, a circulation impeller located in the inner ring shell and arranged coaxially with the inner ring shell, and a molecular sieve plate disposed between the external support and the inner ring shell.

[0013] As a further optimization of the present invention, the gas chamber docking end includes a delivery pipe connected to the connecting pipe, a valve is provided on the delivery pipe, the delivery pipe is connected to a tee joint, and the tee joint is connected to the gas chamber of the electrical equipment through a pipe.

[0014] The beneficial effects of this invention are as follows: 1. The sealing and gas supply mechanism in this invention, together with the outer leak-proof mechanism, forms a double-layer sealing structure. The annular sealing gaskets at both ends of the central tube press against the pipeline interface, forming the inner main sealing structure and achieving basic gas sealing of the pipeline, preventing gas leakage under normal operating conditions. Then, by rotating the tensioning screw, the tensioning ring slides, causing the inner wall sealing layer of the bucket-shaped shell to press against the elastic ring on the outer side of the pipeline. The elastic ring, under pressure, undergoes pre-compression elastic deformation and stores elastic potential energy, constructing an outer encapsulated auxiliary seal. In low-temperature environments, the annular sealing gasket and elastic gasket are susceptible to low-temperature contraction, resulting in sealing gaps. At this time, the pre-compressed elastic ring can autonomously release its elastic potential energy to push outwards and compensate, filling the tiny gaps formed by the contraction of the sealing components. This effectively counteracts the leakage risks caused by the contraction of low-temperature materials, solving the problems of low-temperature contraction, sealing failure, and easy cracking and leakage of traditional single-layer sealing gaskets, and significantly improving the sealing reliability under low-temperature conditions.

[0015] 2. This invention uses symmetrical external supports to lock and clamp the components together with a spliced ​​inner ring shell to form a complete sealed external protective cavity, isolating it from the direct invasion of low-temperature airflow from the outside and providing a stable closed working environment. When the electromagnetic coil inside the cavity is energized, it can generate heat. At the same time, relying on the alternating magnetic field to form an eddy current heating effect, the generated heat source continuously heats and raises the temperature of the internal area of ​​the cavity, effectively increasing the working environment temperature of the sealing gasket. This prevents rubber sealing gaskets from hardening, becoming brittle, or cracking in low-temperature environments, ensuring the sealing stability of the device in low-temperature environments.

[0016] 3. When the electromagnetic coil of this invention is energized, it can not only generate the heat energy required for heating, but also generate a stable alternating ring magnetic field. The magnetic field is coupled with the array of permanent magnet blocks with adjacent magnetic poles arranged alternately on the magnetic core support, and continuously outputs a uniform circumferential driving force. It can drive the magnetic core support and the circulating impeller to rotate continuously on the same axis without the need for an additional motor, thereby generating a continuous airflow. The airflow can actively disperse the heat concentrated in the electromagnetic coil, avoiding local heat accumulation and high-temperature aging when the coil is working. At the same time, it evenly diffuses the concentrated heat source to the entire sealed cavity, solving the defects of traditional heating structures such as concentrated heat source, large temperature difference, and easy damage to components. While ensuring uniform heating effect, it effectively extends the service life of the coil and sealing components.

[0017] 4. Under the guidance of the cavity of the external circulation mechanism, the airflow generated by the circulating impeller can form a closed double-layer circulating airflow loop with axial flow in the inner ring shell cavity and return flow in the inner and outer interlayers. This avoids turbulent flow in the cavity and further improves the uniformity of heat distribution throughout the entire area. At the same time, the double-layer airflow and the interlayer air form a heat insulation layer, reducing the impact of external low temperature on the heat conduction of the internal cavity. Meanwhile, the double-layer circulating airflow continuously washes the molecular sieve plate in the interlayer, and the water vapor in the air inside the cavity can be fully adsorbed by the porous structure of the molecular sieve plate, preventing water vapor from condensing on the surface of the low-temperature pipeline and the sealing gasket, thus eliminating the failure, leakage and other faults caused by condensation. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the installation of the external support in this invention; Figure 3 This is a schematic diagram of the external support structure in this invention; Figure 4 This is a schematic diagram showing the location of the heating circulation mechanism in this invention; Figure 5 This is a schematic diagram showing the location of the outer leak-proof mechanism in this invention; Figure 6 This is an assembly diagram of the outer leak-proof mechanism in this invention; Figure 7 This is a schematic diagram of the assembly of the permanent magnet block in this invention.

[0019] In the diagram: 1. Gas delivery end; 2. Connecting pipe; 3. Sealing gas delivery mechanism; 4. Gas chamber docking end; 5. External circulation mechanism; 6. Heating circulation mechanism; 31. First disc; 32. Second disc; 33. Central pipe; 34. Annular sealing gasket; 35. Outer leak-proof mechanism; 41. Delivery pipe; 42. T-joint; 51. Outer support; 52. Inner ring shell; 53. Molecular sieve plate; 61. Mounting platform; 62. Support sleeve; 63. Electromagnetic coil; 64. Connecting disc; 65. Magnetic core bracket; 66. Permanent magnet block; 67. Circulating impeller; 351. Support platform; 352. Tensioning ring; 353. Elastic pad; 354. Tensioning screw; 355. Bucket-shaped shell; 356. Sealing layer; 357. Elastic ring. Detailed Implementation

[0020] The present application will now be described in further detail with reference to the accompanying drawings. It should be noted that the following specific embodiments are only used to further illustrate the present application and should not be construed as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content.

[0021] Example: Please refer to Figures 1-7A device for preventing low-temperature cracking of sulfur hexafluoride (SF6) electrical equipment gaskets includes a gas supply end 1 and a connecting pipe 2. The gas supply end 1 is used to connect to calibration equipment for detecting SF6 concentration. The connecting pipe 2 is connected to a gas chamber docking end 4, which is connected to the gas chamber of the electrical equipment. SF6 gas from the gas chamber can be transported to the calibration equipment for testing. A sealing gas supply mechanism 3 is provided between the gas supply end 1 and the connecting pipe 2. The sealing gas supply mechanism 3 serves as the main connection point for the gas chamber and the calibration equipment. The gas chamber docking end 4 includes a delivery pipe 41 connected to the connecting pipe 2. A valve is installed on the delivery pipe 41 to shut off the gas supply during equipment maintenance and disassembly, facilitating disassembly and maintenance and preventing SF6 leakage during pipe disassembly. The delivery pipe 41 is connected to a tee connector 42, which is connected to the gas chamber of the electrical equipment via a pipe.

[0022] During testing, sulfur hexafluoride (SF6) gas inside the gas chamber of the SF6 electrical equipment flows into the tee connector 42 via a pipeline. The gas is then guided through the tee connector 42 into the delivery pipe 41, where the valve remains open. The gas flows along the delivery pipe 41 into the connecting pipe 2, and then through the gas supply end 1 to connect to the calibration equipment. The sealing gas supply mechanism 3 seals the pipeline joint gaps, ensuring a completely sealed delivery of SF6. This allows for the connection and sampling of gas from inside the equipment to the calibration equipment, enabling online testing of SF6 density, composition, and other parameters. When pipeline maintenance, component disassembly and assembly, equipment gas replenishment, or density relay calibration is required, the valve at the delivery pipe 41 is closed to cut off the gas passage between the electrical equipment gas chamber and the connecting pipe 2, thus blocking the gas supply. After the gas supply is cut off, there is no high-pressure SF6 medium in the subsequent pipeline section. At this point, the gas supply end 1, connecting pipe 2, and sealing gas supply mechanism 3 can be disassembled to prevent SF6 leakage from the gas chamber during disassembly and assembly.

[0023] Please see Figures 3-7The sealing gas supply mechanism 3 includes a first disc 31 fixed to the outer wall of the gas supply end 1 and the connecting pipe 2. The first disc 31 is locked to the screw of the second disc 32 by a nut. The second disc 32 is symmetrically fixed to the central pipe 33. The two ends of the central pipe 33 are respectively connected to the gas supply end 1 and the connecting pipe 2. Annular sealing gaskets 34 are provided in the annular grooves opened at both ends of the central pipe 33. After the first disc 31 and the second disc 32 are locked by the nut, the annular sealing gaskets 34 at both ends of the central pipe 33 are pressed tightly into the grooves at the ends of the gas supply end 1 and the connecting pipe 2, achieving a sealed connection and preventing leakage of sulfur hexafluoride gas. An outer leak-proof mechanism 35 is provided on the second disc 32. The outer leak-proof mechanism 35 can compensate for the annular seal when the temperature drops. The deformation of the gasket 34 ensures a sealing effect and forms an outer seal at the connection point, achieving a double-layer protection effect. A heating and circulation mechanism 6 is provided on the central tube 33. The heating and circulation mechanism 6 can provide heat energy in a low-temperature environment to prevent the annular gasket 34 from cracking under pressure in a low-temperature environment. An external circulation mechanism 5 is provided on the air supply end 1 and the connecting pipe 2. The heating and circulation mechanism 6 is located inside the external circulation mechanism 5. When the heating and circulation mechanism 6 is working, the external circulation mechanism 5 constructs a double-layer flow circuit, which, together with the heating and circulation mechanism 6, forms a circulating flow of hot air, making the heat energy distribution more uniform and preventing local overheating. At the same time, the flowing air forms a heat insulation layer, further reducing the impact of the low-temperature environment on the annular gasket 34.

[0024] Please see Figures 4-7The outer leak-proof mechanism 35 includes a support platform 351 fixed on the second disc 32. The support platform 351 is sleeved on the central tube 33. The support platform 351 is slidably connected to a tension ring 352 via a guide rod. A sealing ring is provided at the connection between the inner wall of the tension ring 352 and the support platform 351. An annular elastic pad 353 is fixed on the side of the support platform 351 near the tension ring 352. A tension screw 354 is threadedly connected to the tension ring 352. The tension screw 354 is rotatably connected to the second disc 32. A reduced-size funnel-shaped shell 355 is fixed on one side of the tension ring 352. A sealing layer 356 is fixed on the inner wall of the funnel-shaped shell 355. An elastic ring 357 is fixed to the air supply end 1 and the connecting pipe 2 by bolts, forming an arc-shaped skirt. In this structure, after the first disc 31 is locked onto the second disc 32 by a nut, the tensioning screw 354 is rotated to drive the tensioning ring 352 closer to the support platform 351 until the tensioning ring 352 is pressed tightly onto the elastic pad 353. During this process, the elastic ring 357 gradually approaches the shrinking shell outlet of the bucket-shaped shell 355. After the elastic ring 357 abuts against the sealing layer 356 of the bucket-shaped shell 355 from the inner wall, it undergoes elastic deformation and presses the sealing layer 356 to form a double-layer sealing structure. At the same time, when affected by the low temperature environment, the pre-compressed and deformed elastic ring 357 can rebound outward to compensate for the small shrinkage of the structure under the low temperature environment by relying on its own stored elastic potential energy, automatically filling the sealing gaps, always maintaining the sealing effect, and offsetting the leakage risk caused by the material shrinkage at low temperatures.

[0025] Please see Figures 3-7 The heating circulation mechanism 6 includes mounting platforms symmetrically arranged on the central tube 33. A support sleeve 62 is fixed on the mounting platform 61, and an electromagnetic coil 63 is wound on the support sleeve 62. (The electromagnetic coil 63 is connected to an external power supply device via a wire. The electromagnetic coil 63 is existing technology and will not be described in detail here.) A connecting plate 64 is rotatably connected to one side of the mounting platform 61 via a bearing. A magnetic core support 65 is fixed on the connecting plate 64. Permanent magnet blocks 66 are fixed in the grooves evenly opened on the inner wall of the magnetic core support 65. The magnetic poles of adjacent permanent magnet blocks 66 are interleaved to form a circumferentially alternating polarity array. The core support 65 is coaxially arranged with the electromagnetic coil 63, and the electromagnetic coil 63 on one side is located inside the core support 65. A circulating impeller 67 is fixed on the core support 65. When the electromagnetic coil 63 is energized, it will generate heat and generate an alternating magnetic field. The heat can increase the ambient temperature of the sealing gasket, avoiding low-temperature hardening and brittle failure. The magnetic field can continuously generate circumferential driving force, which drives the core support 65 and the circulating impeller 67 to rotate through the array structure composed of permanent magnet blocks 66. The rotating circulating impeller 67 generates airflow to dissipate the heat generated by the electromagnetic coil 63, avoiding local high temperature heat accumulation and aging of the electromagnetic coil 63.

[0026] Please see Figures 1-4The external circulation mechanism 5 includes two external supports 51 fitted onto the air supply end 1 and the connecting pipe 2. These external supports 51 are symmetrically arranged on both sides. During installation, the two external supports 51 are fitted onto the air supply end 1 and the connecting pipe 2 from both sides and secured with bolts. An inner ring shell 52 is fixed to the inner wall of the external supports 51. After the two external supports 51 are locked, the inner ring shells 52 in the external supports 51 are spliced ​​together to form a complete annular structure, forming a sandwich cavity with the external supports 51. The circulation impeller 67 is located in the inner ring shell 52, and the circulation impeller 67 is coaxially arranged with the inner ring shell 52. A molecular sieve plate 53 is provided between the external supports 51 and the inner ring shell 52. The molecular sieve plate 53 is a crystalline aluminosilicate metal that can adsorb surrounding water vapor through its internal pore structure. 53 is existing technology and will not be elaborated on here). The airflow generated by the rotation of the circulating impeller 67 will produce an airflow that flows towards one end of the inner ring shell 52 until it reaches the end of the inner ring shell 52, enters the interlayer between the outer support 51 and the inner ring shell 52, and then passes through the interlayer and re-enters the inner ring shell 52 to create a double-layer circulation. On the one hand, this avoids turbulence and improves the uniformity of heat diffusion. On the other hand, the double-layer circulation structure can play a role in heat insulation, further reducing the impact of the external low temperature environment on the internal structure of the inner ring shell 52. The flowing airflow can promote the moisture in the air inside the outer support 51 to pass through the molecular sieve plate 53 during installation. After the moisture passes through the molecular sieve plate 53, it is captured by the internal pore structure, preventing the moisture remaining inside from condensing with temperature changes.

[0027] It should be noted that, during the assembly stage of this device for preventing low-temperature cracking of gaskets in sulfur hexafluoride electrical equipment, the operator locks and fixes the first disc 31 and the second disc 32 with screws and nuts, pressing the annular sealing gaskets 34 at both ends of the central tube 33, so that the annular sealing gaskets 34 are embedded in the grooves at the gas supply end 1 and the end of the connecting pipe 2, forming the first end face main seal by relying on the annular sealing gaskets 34, blocking gas from leaking out from the pipeline joint gap; then, the tensioning screw 354 is rotated to drive the tensioning ring 352 to slide along the guide rod of the support platform 351 and move closer to press the elastic pad 3 on the side of the support platform 351. 53. Simultaneously, the bucket-shaped shell 355 moves forward synchronously with the tensioning ring 352. The sealing layer 356 on the inner wall of the shell opening hugs the elastic ring 357 pre-installed on the outside of the pipeline. The elastic ring 357 deforms under pressure and stores elastic potential energy, forming an outer layer of sealing on the outer wall of the pipeline. Combined with the inner annular sealing gasket 34, it forms a double-layer sealing and protection structure. After the left and right separate outer supports 51 are hugged and locked, the two inner ring shells 52 are spliced ​​into a complete annular cavity. An interlayer space is formed between the outer support 51 and the inner ring shell 52. Molecular sieve plates 53 are pre-installed inside the interlayer, which covers and protects the entire sealing heat exchange structure. During testing, sulfur hexafluoride gas inside the gas chamber of the sulfur hexafluoride electrical equipment is fed into the tee joint 42 via a pipeline. The valve on the delivery pipe 41 is kept open. The gas is fed into the connecting pipe 2 along the delivery pipe 41, and then delivered to the delivery end 1 through the inner cavity of the central tube 33 inside the sealed gas delivery mechanism 3. Finally, it is sent to the external calibration equipment to complete the sampling, density and composition testing of sulfur hexafluoride gas. When the ambient temperature drops and the system enters a low-temperature operating condition, the pre-compressed elastic ring 357 can release its stored elastic potential energy to push outwards, compressing the sealing layer 356 to automatically compensate for the gaps formed by the cold contraction of the sealing components, achieving passive sealing compensation and maintaining the sealing effect of the outer layer to prevent air leakage due to structural shrinkage under low-temperature conditions. Simultaneously, the external power supply to the electromagnetic coil 63 is connected. After being energized, the electromagnetic coil 63 generates heat through its own energization and the alternating magnetic field that forms eddy currents on the metal tube wall, radiating heat to the periphery of the central tube 33, continuously raising the ambient temperature of the annular sealing gasket 34 and preventing the gasket from hardening and cracking at low temperatures. Furthermore, the coil generates an alternating annular magnetic field, which couples with the magnetic field of the circumferentially alternating permanent magnet blocks 66 on the magnetic core support 65, continuously outputting circumferential torque to drive the magnetic core support 65 and the end circulating impeller 67 to rotate coaxially, circulating... The rotating impeller 67 propels the airflow forward within the inner ring shell 52. After reaching the end of the inner ring shell 52, the airflow is redirected and flows back into the interlayer cavity between the outer support 51 and the inner ring shell 52. After passing through the molecular sieve plate 53 within the interlayer, it flows back into the inner ring shell 52, forming a closed double-layer circulating airflow. The circulating airflow continuously disperses the concentrated heat of the coil, ensuring a uniform temperature distribution within the cavity. This prevents localized overheating and aging of the coil while also avoiding localized cooling of the sealing gasket. When the airflow passes through the molecular sieve plate 53, the water vapor carried in the interlayer air is adsorbed and trapped by the pores of the molecular sieve, preventing condensation on the pipe and sealing surfaces from the source. This eliminates the risk of condensation water vapor corroding the sealing gasket and accelerating its aging. The circulating airflow within the interlayer, combined with the still air in the interlayer, forms an air insulation barrier, blocking the conduction of low external temperatures inward, reducing heat loss within the cavity, and continuously maintaining the working temperature of the sealing gasket.

[0028] The above-described embodiments are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. A device for preventing low-temperature cracking of gaskets in sulfur hexafluoride electrical equipment, comprising a gas supply end (1) and a connecting pipe (2), characterized in that: A sealing gas delivery mechanism (3) is provided between the gas delivery end (1) and the connecting pipe (2). The connecting pipe (2) is connected to the gas chamber docking end (4). An external circulation mechanism (5) is provided on the gas delivery end (1) and the connecting pipe (2). The sealing gas delivery mechanism (3) includes a first disc (31) fixed on the gas delivery end (1) and the connecting pipe (2). The first disc (31) is locked on the second disc (32) by a nut. The second disc (32) is symmetrically fixed on the central pipe (33). The two ends of the central pipe (33) are respectively connected to the gas delivery end (1) and the connecting pipe (2). An annular sealing gasket (34) is provided in the annular groove opened at both ends of the central pipe (33). The annular sealing gasket (34) at both ends of the central pipe (33) is pressed tightly in the groove at the end of the gas delivery end (1) and the connecting pipe (2). An outer leak-proof mechanism (35) is provided on the second disc (32). A heating circulation mechanism (6) is provided on the central pipe (33). The outer leak-proof mechanism (35) includes a support platform (351) fixed on the second disc (32), a tension ring (352) slidably connected on the support platform (351), a sealing ring sleeved on the inner wall of the tension ring (352), an elastic pad (353) provided between the support platform (351) and the tension ring (352), a tension screw (354) threadedly connected to the tension ring (352), the tension screw (354) rotatably connected to the second disc (32), a bucket-shaped shell (355) provided on the tension ring (352), a sealing layer (356) fixed on the inner wall of the bucket-shaped shell (355), an elastic ring (357) abutting on the sealing layer (356), and the elastic ring (357) fixed on the air supply end (1) and the connecting pipe (2).

2. The device for preventing low-temperature cracking of sulfur hexafluoride electrical equipment gaskets according to claim 1, characterized in that: The heating circulation mechanism (6) includes a mounting platform (61) symmetrically arranged on the central tube (33), a support sleeve (62) fixed on the mounting platform (61), and an electromagnetic coil (63) wound on the support sleeve (62).

3. The device for preventing low-temperature cracking of sulfur hexafluoride electrical equipment gaskets according to claim 2, characterized in that: A connecting plate (64) is rotatably connected to the mounting platform (61) on one side, and a magnetic core bracket (65) is fixed on the connecting plate (64). A permanent magnet block (66) is fixed in a groove evenly opened on the inner wall of the magnetic core bracket (65).

4. The device for preventing low-temperature cracking of sulfur hexafluoride electrical equipment gaskets according to claim 3, characterized in that: The magnetic core support (65) is arranged coaxially with the electromagnetic coil (63), and the electromagnetic coil (63) on one side is located inside the magnetic core support (65). A circulating impeller (67) is fixed on the magnetic core support (65).

5. The device for preventing low-temperature cracking of sulfur hexafluoride electrical equipment gaskets according to claim 4, characterized in that: The external circulation mechanism (5) includes an external support (51) sleeved on the air supply end (1) and the connecting pipe (2). An inner ring shell (52) is fixed on the inner wall of the external support (51). A circulation impeller (67) is located in the inner ring shell (52) and the circulation impeller (67) is coaxially arranged with the inner ring shell (52). A molecular sieve plate (53) is provided between the external support (51) and the inner ring shell (52).

6. The device for preventing low-temperature cracking of sulfur hexafluoride electrical equipment gaskets according to claim 1, characterized in that: The gas chamber docking end (4) includes a delivery pipe (41) connected to the connecting pipe (2), a valve is provided on the delivery pipe (41), the delivery pipe (41) is connected to the tee joint (42), and the tee joint (42) is connected to the gas chamber of the electrical equipment through a pipe.

Images