Isolating switch with arc contact double-equipotential arc extinguishing structure

Abstract

The utility model relates to the field of disconnecting switches, and provides an arc contact double-equipotential arc extinguishing structure disconnecting switch, which comprises an arc contact, a first equipotential contact, a second equipotential contact and a shell. The arc contact is arranged in the shell, the bottom of the arc contact is rotationally connected with a first wiring terminal through a rotating shaft, the first wiring terminal is fixedly connected with the side part of the shell, and the arc contact is connected with an operating mechanism. The first equipotential contact is in contact with the arc contact, and the first equipotential contact is electrically connected with a second wiring terminal. The second equipotential contact is located on the side, away from the first equipotential contact, of the arc contact, an arc extinguishing structure is arranged over the first equipotential contact and the second equipotential contact, and the arc extinguishing structure is electrically connected with the second equipotential contact. According to the utility model, the arc contact, the first equipotential contact, the arc striking sheet and the arc extinguishing structure form equipotential, so that a direct-current arc is better and accurately guided into the arc extinguishing structure, and the arc extinguishing effect and the arc extinguishing efficiency of the isolating switch are improved.

Description

Technical Field

[0001] The utility model relates to the field of disconnectors, in particular to an disconnector with an arc contact double equipotential arc extinguishing structure. Background Art

[0002] Isolating switches have many important uses in power systems, mainly including the following aspects:

[0003] 1. Isolate the power supply: One of the main functions of an isolating switch is to isolate the connection between the equipment or line requiring repair or maintenance and the power supply. By operating the isolating switch, a clear disconnect point is formed between the equipment or line and the power supply, thereby ensuring the safety of the maintenance personnel and the equipment.

[0004] 2. Switching operation: In power systems, switching operations are often required to change the system's operating mode or wiring method. Isolating switches, used in conjunction with circuit breakers, can achieve flexible scheduling of power systems and conversion of operating modes.

[0005] 3. Switching small currents: Isolating switches can be used to switch small currents in some cases, such as charging currents of busbars, connectors, and short cables. These operations are usually performed under no-load or very light load conditions.

[0006] 4. Cooperate with other devices to achieve protection functions: In some complex power systems, disconnect switches can also be used in conjunction with other protective devices such as circuit breakers and fuses to achieve more comprehensive protection functions. For example, in the event of a fault, the circuit breaker will quickly cut off the fault current, while the disconnect switch is used to isolate the faulty equipment or line to facilitate maintenance or restore power.

[0007] 5. Provide a visible disconnection point: The disconnection state of the isolating switch provides a clear disconnection point, allowing maintenance personnel to intuitively determine whether the equipment or line has been isolated from the power supply. This is crucial to ensure the safety of maintenance work.

[0008] 6. Adaptability to Different Voltage Levels and Installation Environments: The design and manufacture of disconnectors take into account the requirements of different voltage levels and installation environments. From low voltage to high voltage, and from indoor to outdoor, there are corresponding disconnector products to choose from. This makes disconnectors suitable for a wide range of applications in power systems.

[0009] 7. Achieve electrical isolation: In some special cases, such as when testing or measuring equipment, it is necessary to ensure that the equipment is completely isolated from other live parts. In this case, an isolating switch can be used to achieve electrical isolation to ensure the accuracy and safety of the test or measurement.

[0010] In existing technology, disconnectors generate arcs when opening. However, the arc extinguishing structure of existing disconnectors is weak, which can easily cause the arc to remain in the contact area for a long time, causing damage to the contacts. Therefore, we provide disconnectors with a double equipotential arc extinguishing structure for arc contacts. Utility Model Content

[0011] The utility model aims to solve the technical problem of how to improve the arc extinguishing effect and arc extinguishing efficiency of an isolating switch, and provides an isolating switch with an arc contact double equipotential arc extinguishing structure.

[0012] The technical solution adopted by the present invention to solve its technical problems is: an arc contact double equipotential arc extinguishing structure isolating switch, including: an arc contact, a first equipotential contact, a second equipotential contact, and a shell. The arc contact is arranged in the shell, and its bottom is rotatably connected to the first terminal through a rotating shaft. The first terminal is fixedly connected to the side of the shell, and the arc contact is connected to an operating mechanism. The first equipotential contact is fixed to the inner wall of the shell and contacts the arc contact. The first equipotential contact is electrically connected to the second terminal. The second equipotential contact is fixed in the shell and is located on the side of the arc contact away from the first equipotential contact. An arc extinguishing structure is provided directly above the first equipotential contact and the second equipotential contact, and the arc extinguishing structure is electrically connected to the second equipotential contact.

[0013] When opening the switch, the arc contact is driven to rotate by the operating mechanism, so that the arc contact is separated from the first equipotential contact, and an arc is generated between the arc contact and the first equipotential contact. At this time, the arc contact and the first equipotential contact form an equipotential through the arc. When the arc contact rotates and contacts the second equipotential contact, the arc contact and the arc extinguishing structure form an equipotential, thereby forming an equipotential between the arc contact, the first equipotential contact and the arc extinguishing structure, and better and more accurately introducing the DC arc into the arc extinguishing structure, thereby improving the arc extinguishing effect and arc extinguishing efficiency of the disconnector.

[0014] Furthermore, the second equipotential contact is made of ferromagnetic material, which can better guide the arc.

[0015] Furthermore, the second equipotential contact includes an arcing plate and a resilient contact. The arcing plate is fixed within the housing and is located on the side of the arcing contact away from the first equipotential contact. The upper portion of the arcing plate is electrically connected to the arc extinguishing structure. The resilient contact is disposed between the arcing contact and the arcing plate and is fixedly connected to the lower portion of the arcing plate.

[0016] When the arcing contact rotates and contacts the elastic contact, the elastic contact will be compressed, thereby buffering the rotation of the arcing contact and preventing the arcing contact from being damaged due to collision.

[0017] Furthermore, the elastic contact includes a buffer cylinder, a sliding ring, a buffer column, and a retaining ring. The buffer cylinder is connected to the lower portion of the arc-starting plate. The sliding ring is slidably disposed within the buffer cylinder. The buffer column is disposed inside the sliding ring and is fixedly connected to the sliding ring. The side of the buffer column is provided with an elastic cavity, and an elastic member is disposed within the elastic cavity. The buffer column and the arc-starting plate abut against each other. The retaining ring is sleeved outside the buffer column and is located outside the sliding ring. The retaining ring is fixedly connected to the buffer column, and the inner diameter of the retaining ring is smaller than the outer diameter of the sliding ring.

[0018] When the arcing contact rotates and contacts the buffer column, the buffer column will compress, thereby buffering the rotation of the arcing contact and preventing damage to the arcing contact due to collision. In addition, the sliding ring and the limit ring can prevent the buffer column from detaching from the buffer cylinder.

[0019] Furthermore, the axes of the buffer cylinder, the sliding ring, the buffer column and the limiting ring coincide with each other and are radially perpendicular to the rotating shaft of the arcing contact, thereby better buffering the rotation of the arcing contact.

[0020] Furthermore, the elastic member is a spring. The spring will deform when subjected to an external force, but will quickly return to its original shape and size once the external force disappears. This property enables the spring to maintain stable performance in various dynamic environments.

[0021] Furthermore, the elastic member is a V-shaped spring leaf.

[0022] Furthermore, the buffer tube is clamped to the lower part of the arc-starting piece, thereby facilitating disassembly and installation.

[0023] Working principle: When opening the switch, the operating mechanism drives the arc contact to rotate, separating the arc contact from the first equipotential contact. An arc is generated between the arc contact and the first equipotential contact. At this time, the arc forms an equipotential between the arc contact and the first equipotential contact. When the arc contact rotates and contacts the buffer column, the elastic member is compressed, thereby buffering the rotation of the arc contact and preventing the arc contact from being damaged by collision. In addition, since the arc contact contacts the buffer column, the arc contact and the buffer cylinder, sliding ring, buffer column, limit ring, elastic member, arc strike plate and arc extinguishing structure form an equipotential, thereby forming an equipotential between the arc contact, the first equipotential contact, the arc strike plate and the arc extinguishing structure, better and more accurately guiding the DC arc into the arc extinguishing structure, thereby improving the arc extinguishing effect and efficiency of the disconnector.

[0024] Beneficial effects of the utility model:

[0025] 1. When opening the switch, the arc contact is driven to rotate by the operating mechanism to separate the arc contact from the first equipotential contact. An arc will be generated between the arc contact and the first equipotential contact. At this time, the arc contact and the first equipotential contact form an equipotential through the arc. When the arc contact rotates and contacts the buffer column, the arc contact and the buffer cylinder, sliding ring, buffer column, limit ring, elastic part, arc striking piece and arc extinguishing structure form an equipotential, thereby forming an equipotential between the arc contact, the first equipotential contact, the arc striking piece and the arc extinguishing structure, and better and more accurately introducing the DC arc into the arc extinguishing structure, thereby improving the arc extinguishing effect and arc extinguishing efficiency of the disconnector.

[0026] 2. When the arc contact rotates and contacts the buffer column, the elastic part will be compressed, thereby buffering the rotation of the arc contact and preventing the arc contact from being damaged due to collision. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is the overall schematic diagram of the arc contact double equipotential arc extinguishing structure disconnector;

[0028] Figure 2 This is a schematic diagram of the internal structure of the arc contact double equipotential arc extinguishing structure disconnector;

[0029] Figure 3 It is a cross-sectional schematic diagram of the elastic contact of the arc contact double equipotential arc extinguishing structure disconnector.

[0030] Explanation of the accompanying drawings: 1. Housing; 2. Second terminal; 3. First terminal; 4. First equipotential contact; 5. Arc contact; 6. Arc extinguishing structure; 7. Arc striking piece; 8. Elastic contact; 9. Buffer cylinder; 10. Elastic part; 11. Sliding ring; 12. Limiting ring; 13. Buffer column. DETAILED DESCRIPTION

[0031] The following will clearly and completely describe the concept and technical effects of the present invention in conjunction with the embodiments so as to fully understand the purpose, features and effects of the present invention.

[0032] like Figure 1-3 As shown, the arc contact double equipotential arc extinguishing structure disconnector includes: an arc contact 5, a first equipotential contact 4, a second equipotential contact, and a housing 1. The arc contact 5 is arranged in the housing 1, and its bottom is rotatably connected to the first terminal 3 via a rotating shaft. The first terminal 3 is fixedly connected to the side of the housing 1, and the arc contact 5 is connected to an operating mechanism. The first equipotential contact 4 is fixed to the inner wall of the housing 1 and contacts the arc contact 5. The first equipotential contact 4 is electrically connected to the second terminal 2. The second equipotential contact is fixed in the housing 1 and is located on the side of the arc contact 5 away from the first equipotential contact 4. An arc extinguishing structure 6 is provided directly above the first equipotential contact 4 and the second equipotential contact. The arc extinguishing structure 6 is electrically connected to the second equipotential contact.

[0033] When opening the switch, the arc contact 5 is driven to rotate by the operating mechanism, so that the arc contact 5 is separated from the first equipotential contact 4, and an arc is generated between the arc contact 5 and the first equipotential contact 4. At this time, an equipotential is formed between the arc contact 5 and the first equipotential contact 4 through the arc. When the arc contact 5 rotates and contacts the second equipotential contact, the arc contact 5 and the arc extinguishing structure 6 form an equipotential, thereby forming an equipotential between the arc contact 5, the first equipotential contact 4 and the arc extinguishing structure 6, and better and more accurately introducing the DC arc into the arc extinguishing structure 6, thereby improving the arc extinguishing effect and arc extinguishing efficiency of the disconnector.

[0034] The second equipotential contact is made of ferromagnetic material, which can better guide the arc.

[0035] The second equipotential contact includes an arcing plate 7 and a spring contact 8. The arcing plate 7 is fixed within the housing 1 and is located on the side of the arcing contact 5 away from the first equipotential contact 4. The upper portion of the arcing plate 7 is electrically connected to the arc extinguishing structure 6. The spring contact 8 is disposed between the arcing contact 5 and the arcing plate 7 and is fixedly connected to the lower portion of the arcing plate 7.

[0036] When the arcing contact 5 rotates and contacts the elastic contact 8 , the elastic contact 8 is compressed, thereby buffering the rotation of the arcing contact 5 and preventing the arcing contact 5 from being damaged due to collision.

[0037] The elastic contact 8 includes a buffer tube 9, a sliding ring 11, a buffer column 13, and a limiting ring 12. The buffer tube 9 is connected to the lower part of the arc-starting piece 7. The sliding ring 11 is slidably arranged inside the buffer tube 9. The buffer column 13 is arranged on the inner side of the sliding ring 11 and is fixedly connected to the sliding ring 11. An elastic cavity is provided on the side of the buffer column 13, and an elastic member 10 is provided in the elastic cavity. The buffer column 13 is against the arc-starting piece 7. The limiting ring 12 is sleeved on the outside of the buffer column 13 and is on the outside of the sliding ring 11. The limiting ring 12 is fixedly connected to the buffer column 13, and the inner diameter of the limiting ring 12 is smaller than the outer diameter of the sliding ring 11.

[0038] When the arc contact 5 rotates and contacts the buffer column 13, the buffer column 13 is compressed, thereby buffering the rotation of the arc contact 5 and preventing the arc contact 5 from being damaged by collision. In addition, the sliding ring 11 and the limit ring 12 can prevent the buffer column 13 from separating from the buffer cylinder 9.

[0039] The axes of the buffer cylinder 9 , the sliding ring 11 , the buffer column 13 and the limiting ring 12 coincide with each other and are radially perpendicular to the rotation axis of the arcing contact 5 , thereby better buffering the rotation of the arcing contact 5 .

[0040] The elastic member 10 is a spring. The spring will deform when subjected to an external force, but once the external force disappears, it will quickly return to its original shape and size. This property enables the spring to maintain stable performance in various dynamic environments.

[0041] The elastic member 10 is a V-shaped spring leaf.

[0042] The buffer tube 9 is clamped with the lower part of the arc-starting piece 7, so that it can be easily disassembled and assembled.

[0043] Working principle: When opening the switch, the arc contact 5 is driven to rotate by the operating mechanism, so that the arc contact 5 is separated from the first equipotential contact 4. An arc will be generated between the arc contact 5 and the first equipotential contact 4. At this time, the arc contact 5 and the first equipotential contact 4 form an equipotential between them. When the arc contact 5 rotates and contacts the buffer column 13, the elastic member 10 is compressed, thereby buffering the rotation of the arc contact 5 and preventing the arc contact 5 from being damaged due to collision. And because the arc contact 5 is in contact with the buffer column 13, the arc contact 5 and the buffer cylinder 9, the sliding ring 11, the buffer column 13, the limit ring 12, the elastic member 10, the arc striking piece 7 and the arc extinguishing structure 6 form an equipotential, thereby forming an equipotential between the arc contact 5, the first equipotential contact 4, the arc striking piece 7 and the arc extinguishing structure 6, and better and more accurately guiding the DC arc into the arc extinguishing structure 6, thereby improving the arc extinguishing effect and arc extinguishing efficiency of the disconnector.

[0044] The above embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, other embodiments obtained by technicians in this field without creative work are all within the scope of protection of the present invention.

Claims

1. Arc contact double equipotential arc extinguishing structure disconnector, characterized in that: include: An arc contact (5), a first equipotential contact (4), a second equipotential contact, and a housing (1); the arc contact (5) is arranged in the housing (1), and its bottom is rotatably connected to a first terminal (3) via a rotating shaft, the first terminal (3) is fixedly connected to the side of the housing (1), and the arc contact (5) is connected to an operating mechanism; the first equipotential contact (4) is fixed to the inner wall of the housing (1) and contacts the arc contact (5), and the first equipotential contact (4) is electrically connected to the second terminal (2); the second equipotential contact is fixed in the housing (1) and is located on the side of the arc contact (5) away from the first equipotential contact (4), an arc extinguishing structure (6) is arranged directly above the first equipotential contact (4) and the second equipotential contact, and the arc extinguishing structure (6) is electrically connected to the second equipotential contact.

2. The arc contact double equipotential arc extinguishing structure disconnector according to claim 1, characterized in that: The second equipotential contact is made of ferromagnetic material.

3. The arc contact double equipotential arc extinguishing structure disconnector according to claim 1, characterized in that: The second equipotential contact comprises an arc-striking piece (7) and an elastic contact (8); the arc-striking piece (7) is fixed in the housing (1) and is located on the side of the arc contact (5) away from the first equipotential contact (4), and the upper part of the arc-striking piece (7) is electrically connected to the arc extinguishing structure (6); the elastic contact (8) is arranged between the arc contact (5) and the arc-striking piece (7), and is fixedly connected to the lower part of the arc-striking piece (7).

4. The arc contact double equipotential arc extinguishing structure disconnector according to claim 3, characterized in that: The elastic contact (8) includes a buffer tube (9), a sliding ring (11), a buffer column (13), and a limiting ring (12); the buffer tube (9) is connected to the lower part of the arc-striking piece (7); the sliding ring (11) is slidably arranged inside the buffer tube (9); the buffer column (13) is arranged on the inner side of the sliding ring (11) and is fixedly connected to the sliding ring (11); an elastic cavity is provided on the side of the buffer column (13); an elastic member (10) is provided in the elastic cavity, and the elastic member (10) is abutted against the arc-striking piece (7); the limiting ring (12) is sleeved outside the buffer column (13) and is located outside the sliding ring (11); the limiting ring (12) is fixedly connected to the buffer column (13); the inner diameter of the limiting ring (12) is smaller than the outer diameter of the sliding ring (11).

5. The arc contact double equipotential arc extinguishing structure disconnector according to claim 4, characterized in that: The axes of the buffer cylinder (9), the sliding ring (11), the buffer column (13), and the limiting ring (12) coincide with each other and are radially perpendicular to the rotating axis of the arc contact (5).

6. The arc contact double equipotential arc extinguishing structure disconnector according to claim 4, characterized in that: The elastic member (10) is a spring.

7. The arc contact double equipotential arc extinguishing structure disconnector according to claim 4, characterized in that: The elastic member (10) is a V-shaped spring leaf.

8. The arc contact double equipotential arc extinguishing structure disconnector according to claim 4, characterized in that: The buffer cylinder (9) is clamped with the lower portion of the arc-starting piece (7).

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