An environmentally friendly gas insulated circuit breaker

Abstract

The present invention discloses an environmentally friendly gas insulated circuit breaker, comprising a sealed metal box and a vacuum arc extinguishing device arranged inside the sealed metal box, a supporting slide plate is arranged between two opposite walls of the sealed metal box; the vacuum arc extinguishing device comprises a static contact, a shell, a vacuum arc extinguishing chamber and a moving contact connecting rod, the static contact is arranged at the upper end of the shell, the vacuum arc extinguishing chamber and the moving contact connecting rod are arranged inside the shell, and an environmentally friendly insulator is arranged on the outer wall of the shell; a horizontal transmission device is connected to the lower end surface of the supporting slide plate, and a vertical transmission device is connected to the moving contact connecting rod. The present invention meets the insulation requirements of the circuit breaker without using SF6 gas as an external insulating medium, realizes the miniaturization of the circuit breaker, and the fully enclosed gas chamber is filled with a certain pressure of environmentally friendly gas for insulation, which is pollution-free to the environment and more safe and environmentally friendly.

Description

Technical Field

[0001] The present invention relates to the technical field of circuit and electrical engineering, and in particular to an environmentally friendly gas insulated circuit breaker. Background Art

[0002] A circuit breaker is a switch device that can close, carry and disconnect current under normal circuit conditions and close, carry and disconnect current under abnormal circuit conditions within a specified time. Circuit breakers can be used to distribute electrical energy, start asynchronous motors infrequently, protect power lines and motors, etc., and automatically cut off the circuit when they are seriously overloaded or short-circuited or undervoltage. Its function is equivalent to the combination of a fuse switch and an over-underheating relay, etc., and generally no parts need to be changed after breaking the fault current. At present, it has been widely used.

[0003] In modern society, electricity is indispensable in the fields of industry, agriculture, transportation, national defense, culture, education, health, finance, commerce, tourism services and people's lives. Power distribution is an extremely important link in the generation, transmission and use of electricity. The traditional fully insulated circuit breakers on the existing market use SF6 gas insulation. Although SF6 has good insulation and arc extinguishing performance, it is not environmentally friendly. The worked SF6 gas will produce toxic gas under the action of the arc, which poses a safety hazard. Under the promotion of the Institute of Electrical Engineering, an environmentally friendly gas fully insulated vacuum arc extinguishing chamber with vacuum arc extinguishing was launched. However, the environmentally friendly gas fully insulated vacuum arc extinguishing chambers on the market currently all add an isolating switch on the basis of the vacuum arc extinguishing chamber, which increases the cost of the product and increases the height of the product, and cannot be miniaturized. Summary of the invention

[0004] The purpose of the present invention is to solve the above problems of existing vacuum circuit breakers, such as large size, high cost, environmental pollution and inconvenient installation and maintenance, and to propose an environmentally friendly gas insulated circuit breaker.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] An environmentally friendly gas insulated circuit breaker comprises a closed metal box and a vacuum arc extinguishing device arranged inside the closed metal box, the closed metal box is filled with environmentally friendly gas, a supporting slide is arranged between two opposite walls of the closed metal box, and a horizontal slide groove matched with the supporting slide is arranged on the wall of the closed metal box;

[0007] The vacuum arc extinguishing device comprises a stationary contact, a shell, a vacuum arc extinguishing chamber and a moving contact connecting rod, wherein the stationary contact is arranged at the upper end of the shell, the vacuum arc extinguishing chamber and the moving contact connecting rod are arranged inside the shell, and an environmental protection insulator is arranged on the outer wall of the shell;

[0008] A horizontal transmission device is connected to the lower end surface of the supporting slide plate, and a vertical transmission device is connected to the moving contact connecting rod.

[0009] As a further description of the above technical solution:

[0010] Limit blocks are provided in the movement directions of the horizontal transmission device and the vertical transmission device.

[0011] As a further description of the above technical solution:

[0012] The vacuum arc extinguishing devices are provided in three numbers.

[0013] As a further description of the above technical solution:

[0014] One or more air inlet holes are arranged on the peripheral wall of the sealed metal box.

[0015] As a further description of the above technical solution:

[0016] The shell is an insulating, high-strength, high-temperature resistant porcelain shell.

[0017] As a further description of the above technical solution:

[0018] The vacuum arc extinguishing device is fixedly connected to the supporting slide plate, and the moving contact connecting rod passes through the supporting slide plate.

[0019] As a further description of the above technical solution:

[0020] The horizontal transmission device includes a threaded rod, a first rotating rod, a first gear and a first rack, the threaded rod is meshed with the first gear, the first gear is coaxially fixedly connected to the first rotating rod, the first gear is meshed with the first rack, and the first rack is fixedly connected to the lower end surface of the supporting slide plate.

[0021] As a further description of the above technical solution:

[0022] The vertical transmission device includes a second rotating rod, a second gear and a second rack. A horizontal slide groove matching the second rotating rod is provided on the wall of the closed metal box. The second gear is coaxially fixedly connected to the second rotating rod. The second gear is meshingly connected to the second rack, and the second rack is fixedly connected to the end of the moving contact connecting rod.

[0023] As a further description of the above technical solution:

[0024] An insulating plate is fixedly connected to the inner surface wall of the sealed metal box, and the insulating plate is made of epoxy resin.

[0025] As a further description of the above technical solution:

[0026] A base is fixedly connected to the lower end surface of the outside of the sealed metal box, and fixed blocks are fixedly connected to the two horizontal end surfaces of the base. A bottom plate is arranged below the base, and the two horizontal end surfaces of the bottom plate are provided with L-shaped limiting grooves matching with the fixed blocks, and the upper end surface of the bottom plate is provided with a placement groove matching with the base, and the bottom plate is connected to a fixing plate by bolts.

[0027] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0028] 1. In the present invention, an environmentally friendly insulator is provided on the housing of the vacuum arc extinguishing device, so that the creepage distance is increased under a certain volume, the insulation requirements of the circuit breaker are met without using SF6 gas as the external insulating medium, and the miniaturization of the circuit breaker is achieved.

[0029] 2. The present invention solves the problem that the existing similar products use SF6 gas for low-temperature liquefaction and are not environmentally friendly. At the same time, the product also has the advantages of modular design and high mechanical reliability. The entire circuit breaker system adopts modular design, with a simple and reliable structure and high module interchangeability. The fully enclosed gas chamber is filled with environmentally friendly gas at a certain pressure for insulation, which does not pollute the environment, is small in size, fully insulated, and fully sealed, making it safer and more environmentally friendly.

[0030] 3. In the present invention, by providing a base and a bottom plate at the bottom of the metal closed box, installation is more convenient. At the same time, during maintenance, it is only necessary to remove the bolts connecting the fixing block and the bottom plate, so that on-site maintenance is convenient and the workload is small. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic cross-sectional view of the overall structure of the present invention;

[0032] Figure 2 It is a side view structural schematic diagram of the present invention;

[0033] Figure 3 It is a schematic diagram of the structure of the vacuum arc extinguishing device in the present invention;

[0034] Figure 4 A top view of the bottom plate structure of the present invention;

[0035] Figure 5 It is a side view of the bottom plate structure of the present invention.

[0036] Legend:

[0037] 1. Sealed metal box; 2. Support slide plate; 3. Static contact; 4. Housing; 5. Vacuum interrupter; 6. Moving contact connecting rod; 7. Environmental protection insulator; 8. Horizontal transmission device; 81. Threaded rod; 82. First rotating rod; 83. First gear; 84. First rack; 9. Vertical transmission device; 91. Second rotating rod; 92. Second gear; 93. Second rack; 10. Air inlet; 12. Base; 13. Fixed block; 14. Bottom plate; 15. Fixed plate. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] Embodiment 1:

[0040] See also Figure 1-5 An environmentally friendly gas-insulated circuit breaker comprises a sealed metal box 1 and a vacuum arc extinguishing device arranged inside the sealed metal box 1. The sealed metal box 1 is filled with environmentally friendly gas, which replaces the traditional SF6 gas, has no pollution to the environment and is more environmentally friendly; a supporting slide plate 2 is arranged between two opposite walls of the sealed metal box 1, and a horizontal slide groove matched with the supporting slide plate 2 is arranged on the wall surface of the sealed metal box 1;

[0041] The vacuum arc extinguishing device comprises a stationary contact 3, a housing 4, a vacuum arc extinguishing chamber 5 and a moving contact connecting rod 6. The stationary contact 3 is arranged at the upper end of the housing 4, the vacuum arc extinguishing chamber 5 and the moving contact connecting rod 6 are arranged inside the housing 4, and an environmentally friendly insulator 7 is arranged on the outer wall of the housing 4, so that the creepage distance is increased without changing the volume, and the miniaturization of the circuit breaker is realized;

[0042] A horizontal transmission device 8 is connected to the lower end surface of the supporting slide plate 2, and a vertical transmission device 9 is connected to the moving contact connecting rod 6. The arrangement of the horizontal transmission device 8 and the vertical transmission device 9 realizes the grounding, closing and breaking of the circuit breaker. At the same time, the entire circuit breaker has a modular design and high mechanical reliability, which facilitates on-site installation and maintenance;

[0043] Limit blocks are provided in the movement directions of the horizontal transmission device 8 and the vertical transmission device 9, so that the vacuum arc extinguishing device and the moving contact connecting rod 6 move within a suitable range;

[0044] There are three vacuum arc extinguishing devices;

[0045] One or more air inlet holes 10 are provided on the peripheral wall of the sealed metal box 1 to ensure that there is sufficient environmentally friendly gas in the sealed metal box 1;

[0046] The housing 4 is an insulating, high-strength, high-temperature resistant porcelain housing, which realizes the insulation and sealing of the vacuum arc extinguishing device and has high safety performance;

[0047] The vacuum arc extinguishing device is fixedly connected to the supporting slide plate 2, and the moving contact connecting rod 6 passes through the supporting slide plate 2;

[0048] The horizontal transmission device 8 includes a threaded rod 81, a first rotating rod 82, a first gear 83 and a first rack 84. The threaded rod 81 is meshedly connected with the first gear 83. The first gear 83 is coaxially fixedly connected to the first rotating rod 82. The first gear 83 is meshedly connected with the first rack 84. The first rack 84 is fixedly connected to the lower end surface of the supporting slide plate 2.

[0049] The vertical transmission device 9 includes a second rotating rod 91, a second gear 92 and a second rack 93. A horizontal slide groove matching the second rotating rod 91 is provided on the wall surface of the sealed metal box 1. The second gear 92 is coaxially fixedly connected to the second rotating rod 91. The second gear 92 is meshedly connected to the second rack 93. The second rack 93 is fixedly connected to the end of the moving contact connecting rod 6.

[0050] An insulating plate is fixedly connected to the inner wall of the sealed metal box 1. The insulating plate is made of epoxy resin. The vacuum arc extinguishing device can be protected by the insulating plate made of epoxy resin, which solves the problem of installing a mold outside the vacuum arc extinguishing device for insulation and saves production costs.

[0051] A base 12 is fixedly connected to the lower end surface of the outer part of the sealed metal box 1, and a fixing block 13 is fixedly connected to the two horizontal end surfaces of the base 12. A bottom plate 14 is arranged below the base 12, and the two horizontal end surfaces of the bottom plate 14 are provided with L-shaped limit grooves matched with the fixing block 13, and the upper end surface of the bottom plate 14 is provided with a placement groove matched with the base 12. The bottom plate 14 is connected with a fixing plate 15 by bolts, and fixing blocks 13 are arranged on both sides of the base 12 of the circuit breaker. In the process of placing the base 12, the fixing block 13 is made to enter the L-shaped limit groove, and a fixing plate 15 is arranged above the bottom plate 14. The fixing plate 15 is used to limit the base 12, preventing the base 12 from falling off from the bottom plate 14, thereby achieving the purpose of fixing the base 12. This bottom plate 14 is reasonably designed, easy to operate, and convenient for clamping the circuit breaker, and also convenient for disassembling the circuit breaker, convenient for people to repair, and convenient for people to use.

[0052] Working principle: Main circuit breaking state: when the vacuum arc extinguishing device is in the breaking position, the vacuum arc extinguishing chamber 5 cannot be closed by operating the vertical transmission device 9; main circuit closing state: operate the horizontal transmission device 8 to close the vacuum arc extinguishing device. At this time, the vertical transmission device 9 can be operated to close the vacuum arc extinguishing chamber 5. After closing, the vacuum arc extinguishing device cannot be operated, and the main circuit closing is completed; the main circuit is from closing to breaking: operate the vertical transmission device 9 to break the vacuum arc extinguishing chamber 5, operate the horizontal transmission device 8 to break the vacuum arc extinguishing device, and at this time the vacuum arc extinguishing device returns to the breaking position; grounding circuit closing: operate the horizontal transmission device 8 to close the vacuum arc extinguishing device to the grounding position. At this time, the vertical transmission device 9 can be operated to close the vacuum arc extinguishing chamber 5. After closing, the vacuum arc extinguishing device cannot be operated, and the grounding circuit closing is completed.

[0053] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An environmentally friendly gas-insulated circuit breaker, comprising a sealed metal box (1) and a vacuum arc extinguishing device arranged inside the sealed metal box (1), characterized in that: The sealed metal box (1) is filled with environmentally friendly gas, a supporting slide plate (2) is provided between two opposite walls of the sealed metal box (1), and a horizontal slide groove matching the supporting slide plate (2) is provided on the wall surface of the sealed metal box (1); The vacuum arc extinguishing device comprises a stationary contact (3), a housing (4), a vacuum arc extinguishing chamber (5) and a moving contact connecting rod (6); the stationary contact (3) is arranged at the upper end of the housing (4); the vacuum arc extinguishing chamber (5) and the moving contact connecting rod (6) are arranged inside the housing (4); and an environmentally friendly insulator (7) is arranged on the outer wall of the housing (4); A horizontal transmission device (8) is connected to the lower end surface of the support slide plate (2), and a vertical transmission device (9) is connected to the moving contact connecting rod (6); The horizontal transmission device (8) comprises a threaded rod (81), a first rotating rod (82), a first gear (83) and a first rack (84); the threaded rod (81) is meshingly connected with the first gear (83); the first gear (83) is coaxially fixedly connected to the first rotating rod (82); the first gear (83) is meshingly connected with the first rack (84); and the first rack (84) is fixedly connected to the lower end surface of the supporting slide plate (2); The vertical transmission device (9) comprises a second rotating rod (91), a second gear (92) and a second rack (93); a horizontal slide groove matching the second rotating rod (91) is provided on the wall surface of the sealed metal box (1); the second gear (92) is coaxially fixedly connected to the second rotating rod (91); the second gear (92) is meshingly connected to the second rack (93); and the second rack (93) is fixedly connected to the end of the moving contact connecting rod (6).

2. An environmentally friendly gas insulated circuit breaker according to claim 1, characterized in that: Limit blocks are provided in the movement directions of the horizontal transmission device (8) and the vertical transmission device (9).

3. The environmentally friendly gas insulated circuit breaker according to claim 1, characterized in that: The vacuum arc extinguishing devices are provided in three numbers.

4. The environmentally friendly gas insulated circuit breaker according to claim 1, characterized in that: One or more air inlet holes (10) are provided on the peripheral wall of the sealed metal box (1).

5. The environmentally friendly gas insulated circuit breaker according to claim 1, characterized in that: The housing (4) is an insulating, high-strength, high-temperature resistant porcelain housing.

6. The environmentally friendly gas insulated circuit breaker according to claim 1, characterized in that: The vacuum arc extinguishing device is fixedly connected to the supporting slide plate (2), and the moving contact connecting rod (6) passes through the supporting slide plate (2).

7. The environmentally friendly gas insulated circuit breaker according to claim 1, characterized in that: An insulating plate is fixedly connected to the inner wall of the sealed metal box (1), and the insulating plate is made of epoxy resin.

8. The environmentally friendly gas insulated circuit breaker according to claim 1, characterized in that: A base (12) is fixedly connected to the lower end surface of the exterior of the sealed metal box (1), and fixing blocks (13) are fixedly connected to the two horizontal end surfaces of the base (12). A bottom plate (14) is arranged below the base (12), and the two horizontal end surfaces of the bottom plate (14) are provided with L-shaped limit grooves matching the fixing blocks (13), and the upper end surface of the bottom plate (14) is provided with a placement groove matching the base (12), and the bottom plate (14) is connected to a fixing plate (15) by bolts.

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