SF6 gas arc extinguishing contact structure of high-voltage switch

Abstract

The utility model belongs to the technical field of high-voltage switches, and particularly relates to a high-voltage switch SF6 gas arc extinguishing contact structure which comprises a shell, a left conducting rod, a right conducting rod, a moving contact, a static contact, an arc extinguishing chamber, a first injection control assembly and a second injection control assembly. The left conducting rod is axially installed in the shell in a sliding mode and located on the axis of the shell, the right conducting rod is fixedly installed in the shell and located on the axis of the shell, a basin-type insulator fixedly connected with the inner wall of the shell is fixedly installed on the right conducting rod, and the arc extinguish chamber is fixedly installed in the shell and connected with the left conducting rod in a sealed sliding mode. The moving contact and the static contact are fixedly installed at the ends, close to each other, of the left conducting rod and the right conducting rod respectively, and the moving contact is in sealed sliding connection with the arc extinguish chamber. The arc extinguishing device is reasonable in design, can realize accurate injection of arc extinguishing gas so as to achieve an efficient arc extinguishing effect, and has relatively high reliability under the condition of ensuring good arc extinguishing performance.

Description

Technical Field

[0001] This utility model relates to the field of high-voltage switch technology, and in particular to a high-voltage switch SF6 gas arc-extinguishing contact structure. Background Technology

[0002] In the field of high-voltage switchgear, SF6 gas is widely used in high-voltage switchgear due to its excellent arc extinguishing and insulation properties. However, in the traditional SF6 gas arc extinguishing contact structure, uneven arc distribution sometimes occurs during the arc extinguishing process. The traditional design cannot perform arc extinguishing operations very efficiently and accurately, which leads to reduced arc extinguishing efficiency and affects the performance of the switch.

[0003] Therefore, designing a novel SF6 gas arc-extinguishing contact structure for high-voltage switches to improve the accuracy and efficiency of arc extinguishing and the reliability of the equipment is an urgent need for current technological development.

[0004] The information disclosed in this background section is intended only to enhance the understanding of the overall background of this utility model and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings mentioned in the background section by proposing a high-voltage switch SF6 gas arc-extinguishing contact structure.

[0006] The above-mentioned technical objective of this utility model is achieved through the following technical solution: a high-voltage switch SF6 gas arc-extinguishing contact structure, including a shell, a left conductive rod, a right conductive rod, a moving contact, a stationary contact, an arc-extinguishing chamber, a first injection control component, and a second injection control component;

[0007] The left conductive rod is axially slidably installed inside the housing and located on the axis of the housing. The right conductive rod is fixedly installed inside the housing and located on the axis of the housing. A basin-type insulator fixedly connected to the inner wall of the housing is fixedly installed on the right conductive rod. The arc-extinguishing chamber is fixedly installed inside the housing and is slidably and sealed to the left conductive rod. The moving contact and the stationary contact are respectively fixedly installed at the ends of the left and right conductive rods that are close to each other. The moving contact is slidably and sealed to the arc-extinguishing chamber. Multiple injection holes are opened on the side of the arc-extinguishing chamber near the moving contact. Multiple conduits connected to the arc-extinguishing chamber and arranged parallel to the axis of the arc-extinguishing chamber are fixedly installed on the side of the arc-extinguishing chamber near the stationary contact. A transfer chamber is provided at the end of the multiple conduits away from the arc-extinguishing chamber. The side of the transfer chamber near the moving contact is arc-shaped and fixedly installed with multiple nozzles. The first injection control component and the second injection control component are both located inside the arc-extinguishing chamber and are adapted to the multiple injection holes and multiple conduits, respectively.

[0008] Preferably, the injection control assembly includes a fixed ring, a sliding ring, and multiple connecting holes. The fixed ring is fixedly installed on the inner wall of the arc-extinguishing chamber, and the fixed ring is in sealed sliding contact with the outer side of the moving contact. The sliding ring is fixedly installed on the moving contact, and is in sealed sliding contact with the inner wall of the arc-extinguishing chamber. The sliding ring is in movable sealed contact with the inner wall of the arc-extinguishing chamber near the stationary contact. Multiple connecting holes are provided on both the sliding ring and the fixed ring, and the connecting holes on the sliding ring, the connecting holes on the fixed ring, and the multiple injection holes are staggered.

[0009] Preferably, the second injection control component includes a second fixed ring, a second sliding ring, and multiple through holes. The second fixed ring is fixedly installed on the inner wall of the arc-extinguishing chamber and movably sleeved on the outside of the left conductive rod. The second sliding ring is slidably installed on the inner wall of the arc-extinguishing chamber and movably sleeved on the outside of the left conductive rod and connected to the left conductive rod. Multiple through holes are opened on the sliding ring. Multiple guides and multiple through holes are staggered. The second sliding ring is in movable sealing contact with the inner wall of the arc-extinguishing chamber on the side near the stationary contact.

[0010] Preferably, a support ring that is fixedly connected to the inner wall of the shell is fixedly installed on the outer side of the arc-extinguishing chamber.

[0011] Preferably, the conduit is semi-rigid.

[0012] Preferably, the cross-section of the arc-extinguishing chamber and the cross-section of the sliding ring are both convex, and the sliding ring is in sealed sliding contact with the inner wall of the arc-extinguishing chamber.

[0013] Preferably, the extended axes of the multiple injection holes all intersect the extended axis of the left conductive rod.

[0014] The beneficial effects of this utility model are:

[0015] 1. Improved arc extinguishing efficiency: Through precise control of the injection control components, it is ensured that the arc extinguishing gas can act quickly and effectively on the contact separation area.

[0016] 2. The structure's stability has been enhanced. The support ring makes the arc-extinguishing chamber more securely fixed within the shell, reducing vibrations caused by high-voltage operation.

[0017] 3. The spray range has been optimized. The semi-rigid design of the duct allows the nozzle to deflect appropriately with the reaction force of the airflow during spraying, ensuring that the spray range can cover both the moving and stationary contacts, thereby improving the arc extinguishing effect.

[0018] 4. The convex design of the sliding ring and the inner wall of the arc-extinguishing chamber effectively divides the space inside the arc-extinguishing chamber, which helps to control the flow direction and speed of the arc-extinguishing gas and further improves the arc-extinguishing efficiency.

[0019] 5. The design of the injection hole axis intersecting with the extended axis of the left conductive rod ensures that the injection hole can be directly aligned with the position of the moving contact and the stationary contact at the moment of contact separation, so that the arc-extinguishing gas can directly act on the separation point, enhancing the immediacy and effectiveness of arc extinguishing. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a three-dimensional structural diagram of an SF6 gas arc-extinguishing contact structure for a high-voltage switch proposed in this utility model;

[0022] Figure 2 This is a partial three-dimensional structural diagram of an SF6 gas arc-extinguishing contact structure for a high-voltage switch proposed in this utility model;

[0023] Figure 3 In this utility model Figure 2 A cross-sectional view of the structural diagram;

[0024] Figure 4 This is a schematic diagram of part A in the SF6 gas arc-extinguishing contact structure of a high-voltage switch proposed in this utility model;

[0025] Figure 5 This is a three-dimensional structural diagram of the fixed ring II, sliding ring II, and through hole portion proposed in this utility model;

[0026] Figure 6 This is a cross-sectional view of the conduit, transfer chamber, and nozzle components proposed in this utility model.

[0027] In the diagram: 1. Shell; 11. Left conductive rod; 111. Moving contact; 12. Right conductive rod; 121. Stationary contact; 122. Basin insulator; 2. Arc extinguishing chamber; 21. Support ring; 3. Fixed ring one; 31. Sliding ring one; 4. Fixed ring two; 41. Sliding ring two; 42. Conduit; 421. Transfer chamber; 422. Nozzle. Detailed Implementation

[0028] The technical solution of this utility model will now be clearly and completely described with reference to specific embodiments. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0029] Reference Figure 1-6A high-voltage switch SF6 gas arc-extinguishing contact structure includes a housing 1, a left conductive rod 11, a right conductive rod 12, a moving contact 111, a stationary contact 121, and an arc-extinguishing chamber 2. The left conductive rod 11 is axially slidably installed inside the housing 1 and located on the axis of the housing 1. The right conductive rod 12 is fixedly installed inside the housing 1 and located on the axis of the housing 1, and a basin-type insulator 122 fixedly installed on the right conductive rod 12 and fixedly connected to the inner wall of the housing 1. The arc-extinguishing chamber 2 is fixedly installed inside the housing 1 and is slidably sealed to the left conductive rod 11. To ensure the stability of the arc-extinguishing chamber 2 inside the housing 1, a support ring 21 fixedly installed on the outer side of the arc-extinguishing chamber 2 and fixedly connected to the inner wall of the housing 1 is provided. The moving contact 111 and the stationary contact 121 are also described. 1. The left conductive rod 11 and the right conductive rod 12 are respectively fixedly installed at their respective ends close to each other, and the moving contact 111 is in a sealed sliding connection with the arc-extinguishing chamber 2. The side of the arc-extinguishing chamber 2 near the moving contact 111 has multiple injection holes. The side of the arc-extinguishing chamber 2 near the stationary contact 121 has multiple conduits 42 that are connected to the arc-extinguishing chamber 2 and are arranged parallel to the axis of the arc-extinguishing chamber 2. The ends of the multiple conduits 42 away from the arc-extinguishing chamber 2 are all provided with transfer chambers 421, and the side of the transfer chambers 421 near the moving contact 111 is arc-shaped and has multiple nozzles 422 fixedly installed. A fixing ring 3 is fixedly installed on the inner wall of the arc-extinguishing chamber 2. The fixing ring 3 is in sealed sliding contact with the outer side of the moving contact 111. A sliding ring 31 is fixedly installed, making sealing and sliding contact with the inner wall of the arc-extinguishing chamber 2. The sliding ring 31 makes movable sealing contact with the inner wall of the arc-extinguishing chamber 2 near the stationary contact 121. Both the sliding ring 31 and the fixed ring have multiple connecting holes, and the connecting holes on the sliding ring 31 are staggered with the connecting holes and multiple injection holes on the fixed ring 31. This allows the left conductive rod 11 to control the moving contact 111 to disengage from the stationary contact 121 while controlling the sliding ring 31 to move to the left. This allows the sliding ring 31 to disengage from the sealing contact with the inner wall of the arc-extinguishing chamber 2 near the stationary contact 121, enabling the arc-extinguishing gas to pass through the connecting holes and then through the injection holes for arc extinguishing. The inner wall of the arc-extinguishing chamber 2... A fixed ring 4 is fixedly installed and movably sleeved on the outside of the left conductive rod 11. A sliding ring 41 is slidably installed on the inner wall of the arc-extinguishing chamber 2. The sliding ring 41 is movably sleeved on the outside of the left conductive rod 11 and connected to the left conductive rod 11. Multiple through holes are opened on the sliding ring. Multiple conduits 42 are staggered with multiple through holes. The sliding ring 41 is in movable sealing contact with the inner wall of the arc-extinguishing chamber 2 near the stationary contact 121. When the left conductive rod 11 controls the moving contact 111 to disengage from the stationary contact 121, the sliding ring 41 can be controlled to move to the left, thereby allowing the sliding ring 41 to disengage from the sealing contact with the inner wall of the arc-extinguishing chamber 2, and allowing the arc-extinguishing gas to enter the conduit 42 through the through holes.

[0030] In this embodiment, in order to ensure that the spray range of the nozzle always covers the moving contact 111 and the stationary contact 121, thereby effectively improving the arc extinguishing effect, the guide tube 42 is semi-rigid and can deflect based on the connection point with the arc extinguishing chamber 2 when the nozzle sprays to extinguish the arc.

[0031] In this embodiment, in order to ensure that the space inside the arc-extinguishing chamber 2 can be effectively divided by the sliding ring 31, thereby achieving the effect of guiding the flow path of the arc-extinguishing gas, both the cross-section of the arc-extinguishing chamber 2 and the cross-section of the sliding ring 31 are convex, and the sliding ring 31 is in sealed sliding contact with the inner wall of the arc-extinguishing chamber 2.

[0032] In this embodiment, in order to ensure that the arc-extinguishing gas ejected from the injection hole effectively acts on the positions of the moving contact 111 and the stationary contact 121 when the moving contact 111 and the stationary contact 121 begin to separate, the extended lines of the axes of the multiple injection holes all intersect the extended line of the axis of the left conductive rod 11.

[0033] The circuits, electronic components, and module mechanisms involved all employ existing technologies, which can be fully implemented by those skilled in the art, and need no further explanation. The content protected by this application does not involve any improvement to the software, circuits, or methods.

[0034] Working principle: In use, when the high-voltage switch is closed, the moving contact 111 and the stationary contact 121 are in close contact, forming a current path. When it is necessary to disconnect the circuit, the moving contact 111 is controlled by the left conductive rod 11 to separate from the stationary contact 121. At this time, the interlocking arrangement of the connecting holes on the sliding ring 31, the connecting holes on the support ring 21, and multiple injection holes begins to function. The arc-extinguishing gas is guided and ejected through these gaps. The sliding ring 41 also moves to the left under the control of the left conductive rod 11, causing the sliding ring 41 to break the sealed contact with one side of the inner wall of the arc-extinguishing chamber 2. The arc-extinguishing gas then enters through the through hole. The gas enters the conduit 42, and the semi-rigid design of the conduit 42 allows it to deflect appropriately under the reaction force of the gas jet when the arc-extinguishing gas is injected from the nozzle, ensuring that the injection range covers the moving contact 111 and the stationary contact 121, thereby effectively improving the arc-extinguishing effect. The convex cross-section design of the arc-extinguishing chamber 2 and the sliding ring 31 helps to effectively divide the space inside the arc-extinguishing chamber 2, control the flow direction and speed of the arc-extinguishing gas, and further improve the arc-extinguishing efficiency. Since the axis of the injection hole intersects the extended axis of the left conductive rod 11, it ensures that the arc-extinguishing gas can directly act on the separation point of the moving contact 111 and the stationary contact 121, enhancing the immediacy and effectiveness of arc extinguishing.

[0035] The above provides a detailed description of the SF6 gas arc-extinguishing contact structure for a high-voltage switch provided by this utility model. Specific embodiments have been used to illustrate the principle and implementation of this utility model. The descriptions of these embodiments are merely for the purpose of helping to understand the method and core idea of ​​this utility model. It should be noted that those skilled in the art can make various improvements and modifications to this utility model without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A high-voltage switch SF6 gas arc-extinguishing contact structure, characterized in that, It includes a housing (1), a left conductive rod (11), a right conductive rod (12), a moving contact (111), a stationary contact (121), an arc-extinguishing chamber (2), a jet control assembly one, and a jet control assembly two; The left conductive rod (11) is axially slidably installed inside the housing (1) and located on the axis of the housing (1). The right conductive rod (12) is fixedly installed inside the housing (1) and located on the axis of the housing (1). A basin-type insulator (122) fixedly connected to the inner wall of the housing (1) is fixedly installed on the right conductive rod (12). The arc-extinguishing chamber (2) is fixedly installed inside the housing (1) and is slidably sealed to the left conductive rod (11). The moving contact (111) and the stationary contact (121) are respectively fixedly installed at the ends of the left conductive rod (11) and the right conductive rod (12) that are close to each other. The moving contact (111) is slidably sealed to the arc-extinguishing chamber (2). The arc-extinguishing chamber (2) has multiple injection holes on the side near the moving contact (111). Multiple conduits (42) connected to the arc-extinguishing chamber (2) and arranged parallel to the axis of the arc-extinguishing chamber (2) are fixedly installed on the side of the arc-extinguishing chamber (2) near the stationary contact (121). Each of the multiple conduits (42) has a transfer chamber (421) at the end away from the arc-extinguishing chamber (2). The transfer chamber (421) is arc-shaped on the side near the moving contact (111) and has multiple nozzles (422) fixedly installed. Both the injection control component one and the injection control component two are located in the arc-extinguishing chamber (2) and are adapted to the multiple injection holes and the multiple conduits (42), respectively.

2. The SF6 gas arc-extinguishing contact structure for a high-voltage switch according to claim 1, characterized in that: The injection control assembly includes a fixed ring (3), a sliding ring (31), and multiple connecting holes. The fixed ring (3) is fixedly installed on the inner wall of the arc-extinguishing chamber (2). The fixed ring (3) is in sealed sliding contact with the outer side of the moving contact (111). The sliding ring (31) is fixedly installed on the moving contact (111) and is in sealed sliding contact with the inner wall of the arc-extinguishing chamber (2). The sliding ring (31) is in movable sealed contact with the inner wall of the arc-extinguishing chamber (2) near the stationary contact (121). Multiple connecting holes are provided on both the sliding ring (31) and the fixed ring. The connecting holes on the sliding ring (31) are staggered with the connecting holes on the fixed ring (3) and the multiple injection holes.

3. The SF6 gas arc-extinguishing contact structure for a high-voltage switch according to claim 1, characterized in that: The second injection control component includes a second fixed ring (4), a second sliding ring (41), and multiple through holes. The second fixed ring (4) is fixedly installed on the inner wall of the arc-extinguishing chamber (2) and is movably sleeved on the outside of the left conductive rod (11). The second sliding ring (41) is slidably installed on the inner wall of the arc-extinguishing chamber (2). The second sliding ring (41) is movably sleeved on the outside of the left conductive rod (11) and connected to the left conductive rod (11). Multiple through holes are opened on the sliding ring. Multiple guide tubes (42) are staggered with multiple through holes. The second sliding ring (41) is in movable and sealed contact with the inner wall of the arc-extinguishing chamber (2) on the side close to the stationary contact (121).

4. The SF6 gas arc-extinguishing contact structure for a high-voltage switch according to claim 1, characterized in that: The arc-extinguishing chamber (2) is fixedly installed on the outside of the support ring (21) which is fixedly connected to the inner wall of the shell (1).

5. The SF6 gas arc-extinguishing contact structure for a high-voltage switch according to claim 1, characterized in that: The catheter (42) is semi-rigid.

6. The SF6 gas arc-extinguishing contact structure for a high-voltage switch according to claim 2, characterized in that: The cross-section of the arc-extinguishing chamber (2) and the cross-section of the sliding ring (31) are both convex, and the sliding ring (31) is in sealed sliding contact with the inner wall of the arc-extinguishing chamber (2).

7. The SF6 gas arc-extinguishing contact structure for a high-voltage switch according to claim 1, characterized in that: The extended axes of multiple injection holes all intersect the extended axis of the left conductive rod (11).

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