Normal-pressure air insulation sealing switch cabinet

Abstract

The invention discloses a normal-pressure air insulation sealing switch cabinet which comprises a cabinet body, an instrument chamber, a mechanism chamber and a cable chamber which are sequentially arranged on the cabinet body from top to bottom, an air box is installed on the rear side of the mechanism chamber and located above the cable chamber, and a first sealing shell and a second sealing shell are arranged in the mechanism chamber. A circuit breaker operation mechanism is installed in the first sealing shell, an isolation operation mechanism is installed in the second sealing shell, the air box is a closed box body filled with air, a circuit breaker assembly and an isolation knife assembly matched with the circuit breaker assembly are arranged in the air box, the circuit breaker assembly is connected with the circuit breaker operation mechanism through a first sealing assembly, and the isolation knife assembly is connected with the isolation operation mechanism through a second sealing assembly. The circuit breaker assembly is connected with a wire inlet sleeve which is in sealing connection with the gas box, the isolation knife assembly is connected with the isolation operation mechanism through a second sealing assembly, the isolation knife assembly is connected with a wire outlet sleeve which is in sealing connection with the gas box, and the wire outlet sleeve extends into the cable chamber. The device has the advantages of being low in use cost, high in adaptability, good in sealing performance and small in size.

Description

Technical Field

[0001] The present invention relates to the technical field of electrical distribution cabinets, and more specifically, to a normal pressure air-insulated sealed switch cabinet. Background Art

[0002] In power distribution systems, traditional switchgear is gradually showing its limitations in coping with growing power loads, complex operating environments, and diverse user needs. Some of the insulating media used in traditional switchgear may suffer from aging, moisture, and other issues that affect their insulation performance. Furthermore, switchgear that relies on specialized chemical insulating gases has strict requirements for ambient temperature and humidity, requiring the use of expensive new insulating materials or specialized gas filling and recovery equipment. These switchgear also require complex operations such as regular gas pressure testing and gas replenishment or replacement. For example, traditional switchgear uses SF6 gas as an insulating medium. While it offers excellent insulation performance, it has potential to contribute to the greenhouse effect. In the event of a leak, SF6 gas escapes into the atmosphere, exacerbating global warming. Pressure-type switchgear presents the risk of gas leakage at the connections between the mechanisms / instruments and the cabinet body. Leakage can degrade insulation performance, leading to internal discharges, impacting normal equipment operation, and potentially even causing safety incidents. Its relatively complex structure and large footprint take up valuable space in limited locations, increasing construction costs for areas like distribution rooms. The operating mechanism of traditional switch cabinets is directly exposed, which makes the mechanism come into contact with air and impurities in the air. Over time, this will cause component wear and affect accuracy and service life. Summary of the Invention

[0003] In order to solve the technical problems existing in the traditional switch in the background technology, the present invention innovatively provides a normal pressure air-insulated sealed switch cabinet, which has the advantages of low cost, strong adaptability, good sealing and small size.

[0004] To achieve the above-mentioned technical objectives, an embodiment of the present invention discloses a normal pressure air-insulated sealed switchgear, comprising a cabinet body, wherein the cabinet body comprises an instrument room, a mechanism room, a cable room and an air box, wherein the instrument room, mechanism room and cable room are arranged in sequence from top to bottom, and the air box is installed at the rear side of the mechanism room and above the cable room, wherein a first sealed shell and a second sealed shell are provided in sequence from top to bottom in the mechanism room, wherein a circuit breaker operating mechanism is installed in the first sealed shell, and an isolation operating mechanism is installed in the second sealed shell, and the air box is a closed box filled with air, wherein a circuit breaker assembly and an isolation knife assembly cooperating with the circuit breaker assembly are provided in the air box, wherein the circuit breaker assembly is connected to the circuit breaker operating mechanism through a first sealing assembly, an incoming line bushing connected to the gas box is connected to the circuit breaker assembly, and the isolation knife assembly is connected to the isolation operating mechanism through a second sealing assembly, and the isolation knife assembly is connected to an outgoing line bushing connected to the gas box through a copper wire, and the outgoing line bushing extends into the cable room.

[0005] Furthermore, the present invention provides a normal pressure air insulated sealed switchgear, wherein the first sealing assembly includes a first sealing sleeve, a first bearing sleeve and a first coupling, the first sealing sleeve is sealed and fixed on the first sealed shell, a first sealing groove is provided on the outer end surface of the first sealing sleeve, a first rubber sealing ring is provided in the first sealing groove, a first convex ring is provided in the middle of the first bearing sleeve, the first sealing sleeve is sleeved on the first convex ring of the first bearing sleeve, the first bearing sleeve is fixed to the outer side wall of the air box through the first convex ring, a second sealing groove is provided on the end surface of the first convex ring facing the air box, a second rubber sealing ring is provided in the second sealing groove, the first coupling is rotatably installed in the first bearing sleeve through a bearing, one end of the first coupling is located in the first sealed shell, and the other end is located in the air box, and the circuit breaker assembly is connected to the circuit breaker operating mechanism through the first coupling.

[0006] Furthermore, the present invention provides a normal pressure air insulated sealed switchgear, wherein the second sealing assembly includes a second sealing sleeve, a second bearing sleeve and a second coupling, the second sealing sleeve is sealed and fixed on the second sealed shell, a third sealing groove is provided on the outer end surface of the second sealing sleeve, a third rubber sealing ring is provided in the third sealing groove, a second convex ring is provided in the middle part of the second bearing sleeve, the second sealing sleeve is sleeved on the second convex ring of the second bearing sleeve, the second bearing sleeve is fixed on the outer wall of the air box through the second convex ring, a fourth sealing groove is provided on the end surface of the second convex ring facing the air box, a fourth rubber sealing ring is provided in the fourth sealing groove, the second coupling is rotatably installed in the second bearing sleeve through the bearing, one end of the second coupling is located in the second sealed shell, and the other end is located in the air box, and the isolation knife assembly is connected to the isolation operating mechanism through the second coupling.

[0007] Furthermore, the present invention provides a normal pressure air insulated sealed switchgear, wherein a mounting frame is provided in the gas box, the mounting frame includes a front mounting plate and a rear mounting plate, the front mounting plate and the rear mounting plate are respectively fixed on the opposite inner walls of the gas box, and the circuit breaker assembly and the isolating knife assembly are both installed between the front mounting plate and the rear mounting plate.

[0008] Furthermore, the present invention provides a normal pressure air insulated sealed switch cabinet, wherein the isolating knife assembly includes an isolating shaft, a first support beam, a second support beam and an isolating knife, one end of the isolating shaft is fixedly connected to the second coupling, and the other end is rotatably mounted on the rear mounting plate, a first driving crank arm is fixed on the isolating shaft, the first support beam and the second support beam are fixed between the front mounting plate and the rear mounting plate from top to bottom in sequence, the first support beam is fixed with a mounting seat through a first insulator, the mounting seat is connected to the circuit breaker assembly, an isolating static contact is fixed on the mounting seat, the second supporting beam is fixed with a knife seat through a second insulator, one end of the isolating knife is hinged to the knife seat, the middle part of the isolating knife is hinged to the first driving crank arm, the other end of the isolating knife is overlapped with the isolating static contact, and the outlet sleeve is connected to the knife seat through a copper wire.

[0009] Furthermore, the present invention provides a normal pressure air insulated sealed switch cabinet, wherein the circuit breaker assembly includes a third support beam, a circuit breaker shaft and a circuit breaker pole, the third support beam is fixed between the front mounting plate and the rear mounting plate, a support frame is fixed on the third support beam, the circuit breaker shaft is rotatably mounted on the support frame, one end of the circuit breaker shaft is connected to the first coupling, and the other end is a free end, a second driving crank arm is also fixed on the circuit breaker shaft, the circuit breaker pole is located on the lower side of the circuit breaker shaft, the static conductive rod of the circuit breaker pole is fixedly connected to the mounting seat, an insulating pull rod is provided on the moving conductive rod of the circuit breaker pole, the insulating pull rod is push-pull matched with the second driving crank arm, and the incoming bushing is connected to the moving conductive rod of the circuit breaker pole through a conductor.

[0010] Furthermore, the present invention provides a normal-pressure air-insulated sealed switchgear, wherein the incoming line bushing includes a first incoming line bushing and a second incoming line bushing, the first incoming line bushing and the second incoming line bushing are symmetrically and sealedly installed on opposite side walls of the air box, the first incoming line bushing is connected to a first conductor, the second incoming line bushing is connected to a second conductor, and the first conductor and the second conductor are both extended into the circuit breaker pole and connected to the moving conductive rod through the same flexible connection.

[0011] Furthermore, the present invention provides a normal pressure air insulated sealed switch cabinet, wherein the circuit breaker shaft is linked with the first coupling member through a linkage assembly, the linkage member includes a first cam, a second cam and a linkage rod, the big head end of the first cam is fixed to one end of the first coupling member in the air box, the big head end of the second cam is fixed on the circuit breaker shaft, the small heads of the first cam and the second cam are oriented in the same direction, one end of the linkage rod is hinged to the small head end of the first cam, and the other end is hinged to the small head end of the second cam.

[0012] Furthermore, the present invention provides a normal pressure air insulated sealed switch cabinet, wherein a partition is provided in the cable chamber, the partition divides the cable chamber into a wiring chamber and a pressure relief chamber, a first pressure relief plate is provided on the partition, and a second pressure relief plate is provided on the bottom plate of the cabinet body of the pressure relief chamber.

[0013] Furthermore, the present invention provides a normal pressure air-insulated sealed switch cabinet, wherein a first observation window is sealed on the air box, a second observation window is provided in the mechanism chamber, and the second observation window is directly opposite to the first observation window.

[0014] The beneficial effects of the present invention include: Using air as the insulating medium, it is less susceptible to insulation failure due to chemical changes in the medium, effectively reducing the risk of safety accidents and offering significant advantages for use in locations with high safety requirements. It can operate stably within a wider temperature and humidity range, eliminating the need for complex environmental conditioning devices, thereby reducing the probability of equipment failure due to environmental factors. The air box utilizes a sealed design, ensuring the stability of the internal air insulation system in dusty and corrosive gas environments, ensuring the continuous and safe power supply. Operation and maintenance are simplified, eliminating the need for complex gas testing and replenishment procedures. Standard inspection and maintenance of the cabinet exterior and connections are sufficient, reducing the difficulty and workload of operation and maintenance, minimizing the risk of equipment failure due to improper operation and maintenance, and improving the cost-effectiveness and practicality of the equipment throughout its lifecycle. Furthermore, the operating mechanism is sealed to effectively prevent impurities from entering the moving parts, reducing friction and wear caused by impurities, and extending the operating mechanism's service life. The rational layout of the cabinet compartments reduces the switchgear volume by 80% compared to traditional designs. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the three-dimensional structure of a normal pressure air-insulated sealed switchgear according to the present invention;

[0016] Figure 2 This is a right-side structural schematic diagram of a normal-pressure air-insulated sealed switchgear according to the present invention (the right side wall is omitted);

[0017] Figure 3 This is a structural schematic diagram of a first sealing assembly in a normal pressure air-insulated sealed switchgear according to the present invention;

[0018] Figure 4 This is a structural schematic diagram of a second sealing assembly in a normal pressure air-insulated sealed switchgear according to the present invention;

[0019] Figure 5 This is a schematic diagram of the three-dimensional structure of an air box in a normal-pressure air-insulated sealed switchgear according to the present invention;

[0020] Figure 6 Based on Figure 5 A schematic diagram of the structure inside the air box after the air box is hidden;

[0021] Figure 7 Based on Figure 6 Schematic diagram of the left view structure. DETAILED DESCRIPTION

[0022] The following is a detailed explanation and description of a normal pressure air-insulated sealed switchgear of the present invention in conjunction with the accompanying drawings.

[0023] like Figure 1 Combined with Figure 2As shown, an embodiment of the present invention discloses a normal-pressure air-insulated sealed switchgear cabinet, specifically comprising a cabinet body 1, which includes an instrument compartment 11, a mechanism compartment 12, a cable compartment 13, and an air box 14. The instrument compartment 11, mechanism compartment 12, and cable compartment 13 are arranged sequentially from top to bottom, with the air box 14 mounted behind the mechanism compartment 12 and above the cable compartment 13. The rational arrangement of the instrument compartment 11, mechanism compartment 12, cable compartment 13, and air box 14 effectively reduces the size of the entire switchgear cabinet, reducing its volume by 80% compared to a conventional KYN28 cabinet and conserving space. Within the mechanism compartment 12, a first sealed housing 121 and a second sealed housing 122 are arranged sequentially from top to bottom. The first sealed housing 121 houses a circuit breaker operating mechanism 1211, while the second sealed housing 122 houses an isolation operating mechanism 1221. The operating mechanism is also sealed to effectively prevent impurities from entering the moving parts, reducing friction and wear caused by impurities and extending the operating mechanism's service life. The air box 14 is a sealed box filled with air. Using air as the insulating medium, it is less susceptible to insulation failure due to chemical changes in the medium, effectively reducing the risk of safety accidents and offering significant advantages for use in locations with high safety requirements. It can operate stably over a wider temperature and humidity range, eliminating the need for complex environmental conditioning devices, thereby reducing the probability of equipment failure due to environmental factors. Furthermore, the air box 14's sealed design ensures the stability of the internal air insulation system in dusty and corrosive environments, ensuring the continued safety of the power supply. The air box 14 houses a circuit breaker assembly 2 and an isolating blade assembly 38 3, which cooperates with the circuit breaker assembly 2. The circuit breaker assembly 2 is connected to the circuit breaker operating mechanism 1211 via a first sealing assembly 4. The circuit breaker assembly 2 is connected to an incoming line bushing 6, which is hermetically connected to the air box 14. The isolating blade assembly 38 3 is connected to the isolating operating mechanism 1221 via a second sealing assembly 5. The isolating blade assembly 38 3 is connected to an outgoing line bushing 7, which is also hermetically connected to the air box 14, via a copper conductor 39. The outgoing line bushing 7 extends into the cable compartment 13. This setting method can make the operation and maintenance process simpler. There is no need to perform complicated gas detection and replenishment operations. It is only necessary to check and maintain the appearance and connection parts of the cabinet 1 according to routine requirements, thereby reducing the difficulty and workload of operation and maintenance, reducing the hidden dangers of equipment failure caused by improper operation and maintenance, and improving the economy and practicality of the equipment throughout its life cycle.

[0024] like Figure 3As shown, in one embodiment of the present invention, the first sealing assembly 4 includes a first sealing sleeve 41, a first bearing sleeve 42, and a first coupling 43. The first sealing sleeve 41 is sealed and fixed to the first sealing housing 121. A first sealing groove 411 is defined on the outer end surface of the first sealing sleeve 41, and a first rubber sealing ring 44 is positioned within the first sealing groove 411. This prevents air from leaking from the airbox 14 between the airbox 14 and the first sealing sleeve 41. A first raised ring 421 is positioned in the middle of the first bearing sleeve 42. The first sealing sleeve 41 fits over the first raised ring 421 of the first bearing sleeve 42, which is secured to the outer wall of the airbox 14 via the first raised ring 421. A second sealing groove 422 is defined on the end surface of the first raised ring 421 facing the airbox 14, and a second rubber sealing ring 45 is positioned within the second sealing groove 422. The first sealing sleeve 41 and the first bearing sleeve 42 create a double sealing structure on the outer side of the airbox 14, further ensuring the sealing of the switchgear. The first coupling 43 is rotatably mounted within the first bearing sleeve 42 via a bearing. One end of the first coupling 43 is located within the first sealed housing 121, and the other end is located within the air box 14. The circuit breaker assembly 2 is connected to the circuit breaker operating mechanism 1211 via the first coupling 43. Although a small amount of air within the air box 14 can enter the first sealed housing 121 through the first bearing sleeve 42 and the first coupling 43, the double sealing structure formed by the first sealing sleeve 41 and the first bearing sleeve 42 forms a sealed communication vessel between the air box 14 and the first sealed housing 121, preventing air from leaking out.

[0025] Similarly, if Figure 4 As shown, the second sealing assembly 5 includes a second sealing sleeve 51, a second bearing sleeve 52, and a second coupling 53. The second sealing sleeve 51 is sealed and fixed to the second sealing housing 122. A third sealing groove 511 is provided on the outer end surface of the second sealing sleeve 51, and a third rubber sealing ring 54 is installed in the third sealing groove 511. A second protruding ring 521 is provided in the middle of the second bearing sleeve 52. The second sealing sleeve 51 is sleeved on the second protruding ring 521 of the second bearing sleeve 52. The second bearing sleeve 52 is fixed to the outer wall of the air box 14 via the second protruding ring 521. A fourth sealing groove 522 is provided on the end surface of the second protruding ring 521 facing the air box 14, and a fourth rubber sealing ring 55 is installed in the fourth sealing groove 522. The second coupling 53 is rotatably installed in the second bearing sleeve 52 through a bearing. One end of the second coupling 53 is located in the second sealed shell 122, and the other end is located in the air box 14. The isolation knife 38 assembly 3 is connected to the isolation operating mechanism 1221 through the second coupling 53, which can also prevent the air in the air box 14 from leaking out, thereby ensuring the sealing effect of the air box 14.

[0026] like Figure 5 Combined with Figure 6As shown, in one embodiment of the present invention, to avoid excessive damage to the gas box 14 and thus affect its airtightness, a mounting frame is provided within the gas box 14. More specifically, the mounting frame includes a front mounting plate 141 and a rear mounting plate 142, which are respectively fixed to opposite inner sidewalls of the gas box 14. The front mounting plate 141 and the rear mounting plate 142 are fixed by welding, and the circuit breaker assembly 2 and the isolating knife assembly 38 3 are both mounted between the front mounting plate 141 and the rear mounting plate 142. This double-sided mounting method of the front mounting plate 141 and the rear mounting plate 142 not only ensures the airtightness of the gas box 14, but also evenly distributes the weight of the components and the stress generated during operation, thereby making the installation of the circuit breaker assembly 2 and the isolating knife assembly 38 3 more secure, reducing loosening caused by vibration, and improving the operational reliability of the switchgear.

[0027] like Figure 6 Combined with Figure 7 As shown, in one embodiment of the present invention, the isolation knife 38 assembly 3 includes an isolation shaft 31, a first support beam 32, a second support beam 33 and an isolation knife 38. One end of the isolation shaft 31 is fixedly connected to the second coupling member 53, and the other end is rotatably mounted on the rear mounting plate 142. A first driving crank arm 34 is fixed to the isolation shaft 31. The first support beam 32 and the second support beam 33 are fixed between the front mounting plate 141 and the rear mounting plate 142 from top to bottom. The first support beam 32 is fixed to the mounting seat 35 through the first insulator 321. The mounting seat 35 is connected to the circuit breaker assembly 2. The isolation static contact 36 is fixed to the mounting seat 35. The second support beam is fixed to the knife seat 37 through the second insulator 331. One end of the isolation knife 38 is hinged to the knife seat 37. The electrical safety distance can be ensured by setting the first insulator 321 and the second insulator 331. The middle portion of the isolation blade 38 is hinged to the first drive arm 34. The other end of the isolation blade 38 overlaps the isolation static contact 36. The outlet bushing 7 is connected to the blade holder 37 via a copper wire 39. Based on this structure, the isolation operating mechanism 1221 can rotate the isolation shaft 31 via the second coupling 53. The isolation shaft 31 then rotates the first drive arm 34, which in turn drives the isolation blade 38 to complete the three-position operation.

[0028] The circuit breaker assembly 2 includes a third support beam 21, a circuit breaker shaft 22, and a circuit breaker pole 23. The third support beam 21 is fixed between the front mounting plate 141 and the rear mounting plate 142. A support frame 24 is fixed to the third support beam 21. The circuit breaker shaft 22 is rotatably mounted on the support frame 24. One end of the circuit breaker shaft 22 is connected to the first coupling 43, and the other end is free. A second driving crank arm 25 is also fixed to the circuit breaker shaft 22. The circuit breaker pole 23 is located on the lower side of the circuit breaker shaft 22. The static conductive rod of the circuit breaker pole 23 is fixedly connected to the mounting seat 35. The dynamic conductive rod of the circuit breaker pole 23 is provided with an insulating pull rod, which is in push-pull engagement with the second driving crank arm 25. The incoming bushing 6 is connected to the dynamic conductive rod of the circuit breaker pole 23 via a conductor. The circuit breaker operating mechanism 1211 can drive the circuit breaker shaft 22 to rotate through the first coupling 43, and the circuit breaker shaft 22 drives the second driving crank arm 25 to rotate. The second driving crank arm 25 pushes and pulls the insulating pull rod to disconnect or separate the dynamic conductive rod and the static conductive rod in the circuit breaker pole 23, thereby realizing the opening and closing of the circuit breaker pole 23.

[0029] like Figure 6 As shown, the incoming line bushing 6 includes a first incoming line bushing 61 and a second incoming line bushing 62, which are symmetrically and hermetically mounted on opposite side walls of the gas box 14. A first conductor 63 is connected to the first incoming line bushing 61, and a second conductor 64 is connected to the second incoming line bushing 62. Both the first conductor 63 and the second conductor 64 extend into the circuit breaker pole 23 and are connected to the movable conductive rod via a common flexible connector. With incoming line bushings installed on both the left and right sides of the switchgear, in actual use, switchgear can be freely combined on both the left and right sides, simplifying the combination operation.

[0030] like Figure 6 As shown, in one embodiment of the present invention, the circuit breaker shaft 22 is linked to the first coupling member 43 via a linkage assembly. The linkage assembly includes a first cam 26, a second cam 27, and a linkage rod 28. The large end of the first cam 26 is fixed to the end of the first coupling member 43 within the air box 14, while the large end of the second cam 27 is fixed to the circuit breaker shaft 22. The small ends of the first cam 26 and the second cam 27 face the same direction. One end of the linkage rod 28 is hinged to the small end of the first cam 26, and the other end is hinged to the small end of the second cam 27. The linkage assembly allows the isolation shaft 31 and the circuit breaker shaft 22 to be at different heights, thereby lowering the positions of the isolation operating mechanism 1221 and the circuit breaker operating mechanism 1211 to a more reasonable height. The height of the circuit breaker shaft 22 can also be raised, thereby increasing the space within the air box 14 and thereby increasing the insulation distance.

[0031] like Figure 2As shown, in one embodiment of the present invention, a partition 131 is provided within the cable chamber 13, dividing the cable chamber 13 into a wiring chamber 132 and a pressure relief chamber 133. A first pressure relief plate 1311 is provided on the partition 131, and a second pressure relief plate 1331 is provided on the bottom plate of the cabinet body 1 of the pressure relief chamber 133. When the air pressure within the cable chamber 13 increases, the air pressure will break through the first pressure relief plate 1311 and be released into the pressure relief chamber 133 for relief. If the pressure cannot be fully contained by the first pressure relief, the second pressure relief plate 1331 will be broken, releasing the air pressure outside the cabinet body 1, thereby ensuring stable operation of the switchgear.

[0032] like Figure 1 Combined with Figure 6 As shown, a first observation window 143 is sealed on the gas box 14, and a second observation window 123 is provided in the mechanism chamber 12, so that the second observation window 123 and the first observation window 143 are directly opposite each other. In this way, the internal state of the gas box 14 can be observed from outside the cabinet 1 through the second observation window 123 and the first observation window 143, helping the operator understand the internal state of the gas box 14.

[0033] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0034] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0035] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0036] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements and simple improvements made to the essential contents of the present invention should be included in the scope of protection of the present invention.

Claims

1. A normal pressure air-insulated sealed switchgear, characterized by: The utility model comprises a cabinet, which comprises an instrument room, a mechanism room, a cable room and an air box. The instrument room, the mechanism room and the cable room are arranged in sequence from top to bottom. The air box is installed at the rear side of the mechanism room and is located above the cable room. The mechanism room is provided with a first sealed shell and a second sealed shell from top to bottom. The circuit breaker operating mechanism is installed in the first sealed shell, and the isolation operating mechanism is installed in the second sealed shell. The air box is a closed box filled with air. A circuit breaker assembly and an isolation knife assembly cooperating with the circuit breaker assembly are provided in the air box. The circuit breaker assembly is connected to the circuit breaker operating mechanism through the first sealing assembly. The circuit breaker assembly is connected to an incoming line bushing sealed with the gas box. The isolation knife assembly is connected to the isolation operating mechanism through the second sealing assembly. The isolation knife assembly is connected to an outgoing line bushing sealed with the gas box through a copper wire, and the outgoing line bushing extends into the cable room.

2. The atmospheric pressure air-insulated sealed switchgear according to claim 1, characterized in that: The first sealing assembly includes a first sealing sleeve, a first bearing sleeve and a first coupling. The first sealing sleeve is sealed and fixed on the first sealing housing. A first sealing groove is provided on the outer end surface of the first sealing sleeve. A first rubber sealing ring is provided in the first sealing groove. A first convex ring is provided in the middle of the first bearing sleeve. The first sealing sleeve is sleeved on the first convex ring of the first bearing sleeve. The first bearing sleeve is fixed to the outer side wall of the air box through the first convex ring. A second sealing groove is provided on the end surface of the first convex ring facing the air box. A second rubber sealing ring is provided in the second sealing groove. The first coupling is rotatably installed in the first bearing sleeve through a bearing. One end of the first coupling is located in the first sealing housing, and the other end is located in the air box. The circuit breaker assembly is connected to the circuit breaker operating mechanism through the first coupling.

3. The atmospheric pressure air-insulated sealed switchgear according to claim 2, characterized in that: The second sealing assembly includes a second sealing sleeve, a second bearing sleeve and a second coupling. The second sealing sleeve is sealed and fixed on the second sealing shell. A third sealing groove is provided on the outer end surface of the second sealing sleeve. A third rubber sealing ring is provided in the third sealing groove. A second convex ring is provided in the middle of the second bearing sleeve. The second sealing sleeve is sleeved on the second convex ring of the second bearing sleeve. The second bearing sleeve is fixed to the outer wall of the air box through the second convex ring. A fourth sealing groove is provided on the end surface of the second convex ring facing the air box. A fourth rubber sealing ring is provided in the fourth sealing groove. The second coupling is rotatably installed in the second bearing sleeve through a bearing. One end of the second coupling is located in the second sealing shell, and the other end is located in the air box. The isolation knife assembly is connected to the isolation operating mechanism through the second coupling.

4. The atmospheric pressure air-insulated sealed switchgear according to claim 3, characterized in that: A mounting frame is provided in the gas box, and the mounting frame includes a front mounting plate and a rear mounting plate. The front mounting plate and the rear mounting plate are respectively fixed on the opposite inner side walls of the gas box. The circuit breaker assembly and the isolation knife assembly are both installed between the front mounting plate and the rear mounting plate.

5. The atmospheric pressure air-insulated sealed switchgear according to claim 4, characterized in that: The isolation knife assembly includes an isolation shaft, a first support beam, a second support beam and an isolation knife. One end of the isolation shaft is fixedly connected to the second coupling, and the other end is rotatably mounted on the rear mounting plate. A first driving crank arm is fixed on the isolation shaft. The first support beam and the second support beam are fixed between the front mounting plate and the rear mounting plate from top to bottom. The first support beam is fixed with a mounting seat through a first insulator. The mounting seat is connected to the circuit breaker assembly. An isolation static contact is fixed on the mounting seat. The second supporting beam is fixed with a knife seat through a second insulator. One end of the isolation knife is hinged to the knife seat, the middle part of the isolation knife is hinged to the first driving crank arm, the other end of the isolation knife is overlapped with the isolation static contact, and the outlet bushing is connected to the knife seat through a copper wire.

6. The atmospheric pressure air-insulated sealed switchgear according to claim 5, characterized in that: The circuit breaker assembly includes a third support beam, a circuit breaker shaft and a circuit breaker pole. The third support beam is fixed between the front mounting plate and the rear mounting plate. A support frame is fixed on the third support beam. The circuit breaker shaft is rotatably mounted on the support frame. One end of the circuit breaker shaft is connected to the first coupling and the other end is a free end. A second driving crank arm is also fixed on the circuit breaker shaft. The circuit breaker pole is located on the lower side of the circuit breaker shaft. The static conductive rod of the circuit breaker pole is fixedly connected to the mounting seat. An insulating pull rod is provided on the dynamic conductive rod of the circuit breaker pole. The insulating pull rod is push-pull matched with the second driving crank arm. The incoming bushing is connected to the dynamic conductive rod of the circuit breaker pole through a conductor.

7. The atmospheric pressure air-insulated sealed switchgear according to claim 6, characterized in that: The incoming line bushing includes a first incoming line bushing and a second incoming line bushing, which are symmetrically and sealedly installed on the opposite side walls of the gas box. The first incoming line bushing is connected to a first conductor, and the second incoming line bushing is connected to a second conductor. The first conductor and the second conductor both extend into the circuit breaker pole and are connected to the moving conductive rod through the same flexible connection.

8. The atmospheric pressure air-insulated sealed switchgear according to claim 6, characterized in that: The circuit breaker rotating shaft is linked with the first coupling member through a linkage assembly. The linkage member includes a first cam, a second cam and a linkage rod. The big head end of the first cam is fixed to one end of the first coupling member in the air box, and the big head end of the second cam is fixed to the circuit breaker rotating shaft. The small heads of the first cam and the second cam face the same direction. One end of the linkage rod is hinged to the small head end of the first cam, and the other end is hinged to the small head end of the second cam.

9. The atmospheric pressure air-insulated sealed switchgear according to claim 8, characterized in that: A partition is provided in the cable room, which divides the cable room into a wiring room and a pressure relief room. A first pressure relief plate is provided on the partition, and a second pressure relief plate is provided on the bottom plate of the cabinet of the pressure relief room.

10. The atmospheric pressure air-insulated sealed switchgear according to claim 9, characterized in that: A first observation window is sealed on the air box, and a second observation window is provided in the mechanism chamber, and the second observation window is directly opposite to the first observation window.

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