Environmentally friendly gas-insulated switchgear

Abstract

The application relates to the technical field of power switch devices, in particular to an environment-friendly gas-insulated switch device which comprises a gas tank, a protective shell, a baffle and a heater, the gas tank is filled with insulating gas, the protective shell is fixedly connected to the outer wall of the gas tank, the protective shell is provided with a containing cavity, the outer wall of the protective shell is provided with a through port, the through port is communicated with the containing cavity, the baffle is slidingly connected to the inner wall of the containing cavity and is used for covering the through port, and the heater is connected to the bottom wall of the containing cavity. When the external temperature is too low, the baffle covers the through port, so that the containing cavity is closed to form a heat preservation cavity, the heater heats the air in the containing cavity to increase the temperature of the gas, heat preservation of the gas tank is realized, the parts in the gas tank are in a suitable working temperature, and the probability of air leakage caused by hardening of a sealing ring is reduced; when the external temperature is suitable, the through port is opened, and heat dissipation of the gas tank is facilitated.

Description

Technical Field

[0001] This application relates to the field of power switchgear, and in particular to an environmentally friendly gas-insulated switchgear. Background Technology

[0002] With the development of my country's power industry, the power system has increasingly higher requirements for the high reliability, maintenance-free operation, miniaturization and environmental protection of power equipment. Environmentally friendly gas-insulated switchgear is a high-tech product that meets these requirements.

[0003] Environmentally friendly gas-insulated switchgear combines gas sealing, electric field simulation analysis, and traditional metal-enclosed switchgear. It places high-voltage components in a sealed container filled with insulating gas at a low pressure, and uses modern processing technology and advanced manufacturing methods to produce a complete series of products with large breaking capacity, excellent performance, safety and stability, compact structure, and small footprint.

[0004] Utility model patent CN215071321U discloses an environmentally friendly gas-insulated switchgear, including a housing, a bushing device, a first operating mechanism, a second operating mechanism, an insulating cylinder, a vacuum interrupter, a positioning mechanism, a disconnecting switch, and a three-phase main busbar bushing. The bushing device is located at the bottom of the housing's inner side. The bushing device is connected to the non-operating end of the vacuum interrupter via a first conductive element. The vacuum interrupter is located inside the insulating cylinder. The operating end of the vacuum interrupter is connected to the first operating mechanism via the positioning mechanism. The upper part of the positioning mechanism is connected to the disconnecting switch via a second conductive element. Corresponding to the position of the disconnecting switch, a second operating mechanism is located on the outer side of the housing. Isolation grounding support seats and isolation high-voltage support seats are located on both sides of the housing. The bottom of the isolation high-voltage support seat is connected to the insulating cylinder, and the top of the isolation high-voltage support seat is connected to the three-phase main busbar bushing fixedly installed on the top of the housing.

[0005] To ensure the insulation performance between components inside the enclosure, it is necessary to ensure that the insulating gas does not leak. However, when the outside temperature is too low, the sealing ring outside the three-phase main bus bushing hardens, which can cause leakage. Summary of the Invention

[0006] To reduce the probability of gas leakage, this application provides an environmentally friendly gas-insulated switchgear.

[0007] The environmentally friendly gas-insulated switchgear provided in this application adopts the following technical solution: An environmentally friendly gas-insulated switchgear includes a gas box, a protective shell, a baffle, and a heater. The gas box is filled with insulating gas. The protective shell is fixedly connected to the outer wall of the gas box. The protective shell has a receiving cavity. The outer wall of the protective shell has an opening that communicates with the receiving cavity. The baffle is slidably connected to the inner wall of the receiving cavity and is used to cover the opening. The heater is connected to the bottom wall of the receiving cavity.

[0008] By adopting the above technical solution, when the outside temperature is too low, the baffle covers the opening, making the receiving cavity closed to form a heat preservation cavity. The heater heats the air in the receiving cavity, causing the gas temperature to rise, thus achieving heat preservation of the gas box and keeping the components inside the gas box at a suitable working temperature, reducing the probability of air leakage caused by the hardening of the sealing ring. When the outside temperature is suitable, the opening is opened to facilitate heat dissipation from the gas box.

[0009] Preferably, an environmentally friendly gas-insulated switchgear further includes a switch, which is fixedly connected to the inner wall of the receiving cavity and electrically connected to the heater, and is used to control the opening and closing of the heater.

[0010] By adopting the above technical solution, it is easy to control the temperature of the gas in the containment cavity by controlling the opening and closing of the heater through a switch, and the operation is simple.

[0011] Preferably, an environmentally friendly gas-insulated switchgear further includes a shape memory alloy, one end of which is fixedly connected to the inner wall of the receiving cavity, and the deformation of the shape memory alloy is used to abut against the switch to control the opening and closing of the heater.

[0012] By adopting the above technical solution, when the ambient temperature is too low, the shape memory alloy deforms and contacts the switch, causing the heater to turn on and heat the air, so that the device is at a suitable temperature and the probability of air leakage is reduced.

[0013] Preferably, an environmentally friendly gas-insulated switchgear further includes a connecting rod, one end of the shape memory alloy facing away from the inner wall of the receiving cavity is fixedly connected to the connecting rod, the connecting rod is fixedly connected to the baffle, and one side of the connecting rod is used to abut against the switch.

[0014] By adopting the above technical solution, the opening and closing of the heater and the sliding of the baffle are controlled simultaneously by the deformation of the shape memory alloy. When the external temperature is too low, the deformation of the shape memory alloy causes the connecting rod to move, the baffle moves to cover the opening, and the heater is turned on at the same time as the connecting rod abuts against the switch. The structure is simple and the operation is convenient.

[0015] Preferably, one side of the baffle is attached to the inner wall of the receiving cavity, the baffle is provided with a vent, and the baffle is slidable to control the connection between the vent and the vent.

[0016] By adopting the above technical solution, the insulation and heat dissipation of the containment cavity can be controlled simply by controlling whether the inlet and the vent are connected. The operation is simple and the baffle does not need to be moved a long distance.

[0017] Preferably, an environmentally friendly gas-insulated switchgear further includes a slide groove, which is fixedly connected to the inner wall of the receiving cavity facing the gas box, with the groove opening facing upwards, and the lower end of the baffle slidably embedded in the slide groove.

[0018] By adopting the above technical solution, the slide guides the sliding of the baffle, making the sliding of the baffle stable and facilitating the control of the connection between the inlet and the vent.

[0019] Preferably, an environmentally friendly gas-insulated switchgear further includes a busbar bushing, a sealing ring, a sealing block, and an elastic block. The outer wall of the gas box is provided with an installation port. The busbar bushing is coaxially fixedly connected to the inner wall of the installation port. The sealing ring is coaxially sleeved on the outer wall of the busbar bushing, and the outer wall of the sealing ring abuts against the inner wall of the installation port. The sealing block is disposed on the outer periphery of the busbar bushing and slides against the outer wall of the gas box. The elastic block is fixedly connected to the end of the sealing block facing the busbar bushing and is used to abut against the outer wall of the busbar bushing.

[0020] By adopting the above technical solution, when the outside temperature is too low, in order to reduce the probability of gas leakage caused by the hardening of the sealing ring, the sealing block slides so that the elastic block abuts against the outer wall of the bus bushing, and performs secondary sealing at the connection between the bus bushing and the installation port, thereby reducing the probability of gas leakage.

[0021] Preferably, an environmentally friendly gas-insulated switchgear further includes a spring and a slider, the slider being slidably connected to the inner wall of the receiving cavity facing the gas box, the baffle being connected to the slider via a transmission assembly, one end of the spring being fixedly connected to the slider, and the other end of the spring being fixedly connected to the sealing block.

[0022] By adopting the above technical solution, the slider moves while the spring drives the sealing block to move. The spring causes the sealing block to press against the outer wall of the air box, improving the sealing performance between the bus bushing and the installation port.

[0023] Preferably, an environmentally friendly gas-insulated switchgear further includes a limiting rod, wherein the end of the blocking block facing the slider is provided with a limiting groove, one end of the limiting rod is fixedly connected to the end of the slider facing the blocking block, and the other end of the limiting rod extends into the limiting groove.

[0024] By adopting the above technical solution, the slider drives the sealing block to slide through the limiting rod, so that the slider can stably control the movement of the sealing block and the device can be used stably.

[0025] Preferably, the transmission assembly includes a gear, a transmission rod, a first rack, and a second rack. Two sealing blocks are provided, evenly spaced around the axis of the busbar bushing. Two sliders are provided, each corresponding to a sealing block. The gear rotates around its own axis and is connected to the inner wall of the receiving cavity. The rotation axis of the gear is parallel to the axis of the busbar bushing. The transmission rod is fixedly connected to a baffle. The first rack is fixedly connected to the transmission rod and meshes with one end of the gear. The first rack is fixedly connected to one slider. The second rack meshes with the other end of the gear and is fixedly connected to the other slider.

[0026] By adopting the above technical solution, while the baffle slides to block the opening, the first rack and the second rack mesh with the two ends of the gear. The first rack and the second rack control the two blocking blocks to approach the busbar bushing, thereby achieving a secondary seal at the connection between the busbar bushing and the installation port. No additional drive source is required, reducing energy consumption.

[0027] In summary, this application includes at least one of the following beneficial technical effects: 1. When the outside temperature is too low, the baffle covers the opening, making the receiving cavity closed to form an insulated cavity. The heater heats the air in the receiving cavity, which raises the gas temperature and achieves heat preservation of the gas box, so that the components inside the gas box are at a suitable working temperature, reducing the probability of the sealing ring hardening and causing air leakage. When the outside temperature is suitable, the opening opens to facilitate heat dissipation of the gas box. 2. The shape memory alloy deforms while controlling the opening and closing of the heater and the sliding of the baffle. When the outside temperature is too low, the shape memory alloy deforms, causing the connecting rod to move. The baffle moves to cover the opening, and the heater is turned on at the same time as the connecting rod abuts against the switch. The structure is simple and the operation is convenient. 3. While the baffle slides to block the opening, the first and second racks mesh with the two ends of the gear. The first and second racks control the two blocking blocks to approach the busbar bushing, achieving a secondary seal at the connection between the busbar bushing and the installation port. No additional drive source is required, reducing energy consumption. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the overall structure of an environmentally friendly gas-insulated switchgear.

[0029] Figure 2 This is a schematic diagram of the internal structure of an environmentally friendly gas-insulated switchgear after it has been cut open.

[0030] Figure 3 This is a schematic diagram of the internal structure of an environmentally friendly gas-insulated switchgear after it has been cut open; it is mainly used for display cabinets.

[0031] Figure 4This is an exploded view of an environmentally friendly gas-insulated switchgear.

[0032] Figure 5 This is a schematic diagram of the internal structure of an environmentally friendly gas-insulated switchgear after it has been cut open. It is mainly used to show the plugging and sealing components.

[0033] Figure 6 yes Figure 4 Enlarged view of point A in the middle.

[0034] Explanation of reference numerals in the attached drawings: 1. Cabinet; 11. Cable compartment; 12. Mechanism compartment; 13. Air box; 131. Mounting port; 14. Relay compartment; 21. Busbar bushing; 22. Sealing ring; 3. Protective shell; 31. Receiving cavity; 311. Guide groove; 32. Clearance opening; 33. Through port; 4. Sealing assembly; 41. Slide groove; 42. Baffle; 421. Vent; 5. Heater; 51. Electric heating rod; 6. Control assembly; 61. Shape memory alloy; 62. Connecting rod; 621. Fixing rod; 63. Switch; 7. Sealing assembly; 71. Slider; 711. Guide block; 72. Sealing block; 721. Limit groove; 73. Elastic block; 74. Limit rod; 75. Spring; 8. Transmission assembly; 81. Gear; 82. Transmission rod; 83. First rack; 84. Second rack. Detailed Implementation

[0035] The following is in conjunction with the appendix Figure 1-6 This application will be described in further detail.

[0036] This application discloses an environmentally friendly gas-insulated switchgear. (Refer to...) Figure 1 and Figure 2 An environmentally friendly gas-insulated switchgear includes a cabinet 1, a bus bushing 21, a sealing ring 22, a protective shell 3, and a sealing assembly 4.

[0037] Reference Figure 3 The cabinet 1 is internally divided into a cable compartment 11, a mechanism compartment 12, an air chamber 13, and a relay compartment 14 by a metal partition. The cable compartment 11 is located below the mechanism compartment 12 and the air chamber 13, the relay compartment 14 is located above the mechanism compartment 12, and the air chamber 13 is located behind the mechanism compartment 12. The air chamber 13 is filled with an insulating gas, which can be nitrogen or dry air.

[0038] Reference Figure 2 The side wall of the air box 13 is provided with an installation port 131. The busbar sleeve 21 is coaxially fixedly connected to the inner wall of the installation port 131. The sealing ring 22 is coaxially sleeved on the outer circumference of the busbar sleeve 21. The outer wall of the sealing ring 22 abuts against the inner wall of the installation port 131. There are three busbar sleeves 21, and the three busbar sleeves 21 are evenly spaced along the height direction of the air box 13.

[0039] Reference Figure 4and Figure 5 The protective shell 3 is fixedly connected to the outer wall of the gas box 13, covering the two side walls and the rear wall of the gas box 13. A receiving cavity 31 is provided between the protective shell 3 and the gas box 13. The protective shell 3 is provided with a clearance opening 32, which is used for the bus bushing 21 to extend out of the receiving cavity 31. The two end faces of the protective shell 3 opposite to the side wall of the gas box 13 are provided with through openings 33. The through openings 33 are located on the side of the clearance opening 32 away from the rear wall of the gas box 13. There are multiple through openings 33, which are evenly spaced along the length of the protective shell 3 and communicate with the receiving cavity 31.

[0040] The sealing component 4 includes a slide groove 41 and a baffle 42. The slide groove 41 is fixedly connected to the inner wall of the receiving cavity 31 facing the side wall of the air box 13. The length direction of the slide groove 41 is parallel to the length direction of the air box 13. The lower end of the slide groove 41 is attached to the bottom wall of the receiving cavity 31, and the groove opening of the slide groove 41 faces upward. The lower end of the baffle 42 is slidably embedded in the slide groove 41. The sliding direction of the baffle 42 is parallel to the length direction of the slide groove 41. The side wall of the baffle 42 is attached to the inner wall of the receiving cavity 31. The baffle 42 is provided with a vent 421. There are multiple vents 421. The vents 421 and the openings 33 are arranged one-to-one. The sliding of the baffle 42 controls the communication between the vents 421 and the openings 33.

[0041] Reference Figure 4 An environmentally friendly gas-insulated switchgear also includes a heater 5, a control component 6, a sealing component 7, and a transmission component 8.

[0042] Reference Figure 4 and Figure 5 The heater 5 is an electric heating rod 51, which is fixedly connected to the bottom wall of the receiving cavity 31 and is located between the slide groove 41 and the outer wall of the air box 13.

[0043] Reference Figure 4 and Figure 6 The control component 6 includes a shape memory alloy 61, a connecting rod 62, and a switch 63. One end of the shape memory alloy 61 is fixedly connected to the inner wall of the receiving cavity 31 facing the rear wall of the air box 13, and the other end of the shape memory alloy 61 is fixedly connected to the connecting rod 62. The ends of the connecting rod 62 facing the rear wall of the air box 13 are connected to fixing rods 621, which are fixedly connected to the baffle 42. The switch 63 is fixedly connected to the rear wall of the air box 13. The deformation of the shape memory alloy 61 pushes the connecting rod 62 to slide, causing the connecting rod 62 to abut against the switch 63. The switch 63 is electrically connected to the electric heating rod 51. When the switch 63 is abutted by the connecting rod 62, the electric heating rod 51 is energized. When the connecting rod 62 moves away from the switch 63, the electric heating rod 51 is de-energized.

[0044] When the ambient temperature is too low, the shape memory alloy 61 elongates when it reaches the deformation temperature, controlling the movement of the connecting rod 62 so that the connecting rod 62 abuts against the switch 63. When the fixing rod 621 pushes the baffle 42 to slide in the slide groove 41, the baffle 42 blocks the opening 33. When the temperature in the receiving cavity 31 rises to a certain temperature, the shape memory alloy 61 completes the deformation reset, so that the baffle 42 is reset, and the opening 33 is connected to the vent 421 for heat dissipation.

[0045] Reference Figure 4 and Figure 5 The sealing assembly 7 includes a slider 71, a sealing block 72, an elastic block 73, a limiting rod 74, and a spring 75. The sealing assembly 7 is located in the receiving cavity 31. Each busbar sleeve 21 has two sliders 71 on its outer periphery. The two sliders 71 are evenly spaced around the axis of the busbar sleeve 21. The end of the slider 71 facing away from the side wall of the air box 13 is connected to a guide block 711. The receiving cavity 31 is provided with a guide groove 311 facing the side wall of the air box 13. The guide groove 311 is used for the guide block 711 to be embedded. The guide groove 311 is a trapezoidal groove. The guide block 711 is a trapezoidal block. The sliding direction of the guide block 711 is horizontal.

[0046] Two blocking blocks 72 are provided, and the blocking blocks 72 and the sliders 71 are arranged one-to-one. The blocking blocks 72 slide against the side wall of the air box 13. The blocking blocks 72 are semi-circular. The elastic block 73 is fixedly connected to the end of the blocking block 72 facing the busbar bushing 21. The elastic block 73 is used to abut against the outer wall of the busbar bushing 21.

[0047] The sealing block 72 has a limiting groove 721 at one end facing away from the side wall of the air box 13. One end of the limiting rod 74 is fixedly connected to the end of the slider 71 facing the side wall of the air box 13, and the other end of the limiting rod 74 is embedded in the limiting groove 721. The limiting rod 74 is slidably connected to the groove wall of the limiting groove 721, and the sliding direction of the limiting rod 74 is along the axial direction of the limiting groove 721. A spring 75 is sleeved on the outer periphery of the limiting rod 74. One end of the spring 75 is fixedly connected to the slider 71, and the other end of the spring 75 is fixedly connected to the sealing block 72.

[0048] Reference Figure 4 and Figure 5The transmission assembly 8 includes a gear 81, a transmission rod 82, a first rack 83, and a second rack 84. The gear 81 is rotatably connected to the end of the receiving cavity 31 facing the side wall of the air box 13, about its own axis. The axis of rotation of the gear 81 is parallel to the axis of the busbar sleeve 21. Three gears 81 are provided, each corresponding to a different busbar sleeve 21. The gears 81 are positioned above the busbar sleeve 21. One end of the transmission rod 82 is fixedly connected to the end of the baffle 42 facing the busbar sleeve 21, and the other end of the transmission rod 82 is fixedly connected to one end of the first rack 83. The first rack 83 meshes with the upper end of the gear 81, and the other end of the first rack 83 is fixedly connected to a slider 71 away from the baffle 42. The second rack 84 meshes with the lower end of the gear 81 and is fixedly connected to the slider 71 near the baffle 42.

[0049] The implementation principle of an environmentally friendly gas-insulated switch 63 device in this application embodiment is as follows: When the external temperature is too low, when the shape memory alloy 61 reaches the critical temperature for deformation, the shape memory alloy 61 deforms and pushes the baffle 42 to slide, causing the baffle 42 to block the opening 33. The shape memory alloy 61 pushes the connecting rod 62 to abut against the switch 63, so that the electric heating rod 51 is energized to heat the air in the accommodating cavity 31, so that the components in the gas box 13 are within a suitable temperature range. While the baffle 42 slides, it pushes the transmission component 8 to drive the slider 71 to slide. While the slider 71 slides, it causes the sealing block 72 to slide. The elastic block 73 abuts against the outer periphery of the bus bushing 21 and is pressed against the side wall of the gas box 13 by the spring 75 to achieve a seal. When the air in the accommodating cavity 31 heats up to the critical temperature for the shape memory alloy 61 to recover, the baffle 42 resets, so that the opening 33 is connected to the vent 421 for heat dissipation, and the sealing block 72 resets.

[0050] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An environmentally friendly gas-insulated switchgear, characterized in that: The device includes a gas box (13), a protective shell (3), a baffle (42), and a heater (5). The gas box (13) is filled with insulating gas. The protective shell (3) is fixedly connected to the outer wall of the gas box (13). The protective shell (3) covers the two side walls and the rear wall of the gas box (13). A receiving cavity (31) is provided between the protective shell (3) and the gas box (13). The protective shell (3) is provided with a clearance opening (32). The clearance opening (32) is used for the bus bushing (21) to extend out of the receiving cavity (31). The outer wall of the protective shell (3) is provided with a through opening (33). The through opening (33) is connected to the receiving cavity (31). The baffle (42) is slidably connected to the inner wall of the receiving cavity (31) and is used to cover the through opening (33). The heater (5) is connected to the bottom wall of the receiving cavity (31). It also includes a busbar bushing (21) and a sealing ring (22). The outer wall of the air box (13) is provided with an installation port (131). The busbar bushing (21) is coaxially fixedly connected to the inner wall of the installation port (131). The sealing ring (22) is coaxially sleeved on the outer wall of the busbar bushing (21). The outer wall of the sealing ring (22) abuts against the inner wall of the installation port (131). It also includes a switch (63), which is fixedly connected to the inner wall of the receiving cavity (31), and is electrically connected to the heater (5). The switch (63) is used to control the opening and closing of the heater (5). It also includes a shape memory alloy (61), one end of which is fixedly connected to the inner wall of the receiving cavity (31), and the shape memory alloy (61) deforms to abut against the switch (63) to control the opening and closing of the heater (5); It also includes a connecting rod (62), one end of the shape memory alloy (61) facing away from the inner wall of the receiving cavity (31) is fixedly connected to the connecting rod (62), the connecting rod (62) is fixedly connected to the baffle (42), and one side of the connecting rod (62) is used to abut against the switch (63). One side of the baffle (42) is attached to the inner wall of the receiving cavity (31). The baffle (42) is provided with a vent (421). The baffle (42) slides to control the connection between the vent (33) and the vent (421).

2. The environmentally friendly gas-insulated switchgear according to claim 1, characterized in that: An environmentally friendly gas-insulated switchgear also includes a slide groove (41), which is fixedly connected to the inner wall of the receiving cavity (31) facing the gas box (13). The groove opening of the slide groove (41) faces upward, and the lower end of the baffle (42) is slidably embedded in the slide groove (41).

3. The environmentally friendly gas-insulated switchgear according to claim 1, characterized in that: An environmentally friendly gas-insulated switchgear also includes a sealing block (72) and an elastic block (73). The sealing block (72) is disposed on the outer periphery of the bus bushing (21) and slides against the outer wall of the gas box (13). The elastic block (73) is fixedly connected to one end of the sealing block (72) facing the bus bushing (21) and is used to abut against the outer wall of the bus bushing (21).

4. The environmentally friendly gas-insulated switchgear according to claim 3, characterized in that: An environmentally friendly gas-insulated switchgear also includes a spring (75) and a slider (71). The slider (71) is slidably connected to the inner wall of the receiving cavity (31) facing the gas box (13). The baffle (42) is connected to the slider (71) through a transmission assembly (8). One end of the spring (75) is fixedly connected to the slider (71), and the other end of the spring (75) is fixedly connected to the sealing block (72).

5. The environmentally friendly gas-insulated switchgear according to claim 4, characterized in that: An environmentally friendly gas-insulated switchgear also includes a limiting rod (74), a limiting groove (721) is provided at one end of the blocking block (72) facing the slider (71), one end of the limiting rod (74) is fixedly connected to one end of the slider (71) facing the blocking block (72), and the other end of the limiting rod (74) extends into the limiting groove (721).

6. The environmentally friendly gas-insulated switchgear according to claim 4, characterized in that: The transmission assembly (8) includes a gear (81), a transmission rod (82), a first rack (83), and a second rack (84). There are two sealing blocks (72), which are evenly spaced around the axis of the busbar sleeve (21). There are two sliders (71), which correspond one-to-one with the sealing blocks (72). The gear (81) rotates around its own axis and is connected to the inner wall of the receiving cavity (31). The rotation axis of the gear (81) is parallel to the axis of the busbar sleeve (21). The transmission rod (82) is fixedly connected to the baffle (42). The first rack (83) is fixedly connected to the transmission rod (82). The first rack (83) meshes with one end of the gear (81). The first rack (83) is fixedly connected to one slider (71). The second rack (84) meshes with the other end of the gear (81). The second rack (84) is fixedly connected to another slider (71).

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