A resistance break structure

Abstract

This utility model relates to the field of circuit breakers, specifically a resistance break structure. It includes a moving contact mechanism and a stationary contact mechanism. The moving contact mechanism includes a connecting contact seat with an inner through-wall and a moving contact assembly slidably sealed on the connecting contact seat. The moving contact assembly has a moving-side air passage connecting the inner and outer sides of the connecting contact seat. The stationary contact mechanism includes a guide cylinder with an inner through-wall and a stationary contact assembly slidably sealed on the guide cylinder. The stationary contact assembly has a stationary-side air passage connecting the inner and outer sides of the guide cylinder, and the stationary contact assembly faces the moving contact assembly. This utility model can shorten the pre-breakdown time by blowing air when the moving and stationary contacts are in contact, avoiding excessive contact erosion and extending the service life of the resistance break.

Description

Technical Field

[0001] This utility model relates to the field of circuit breakers, and in particular to a resistor break structure. Background Technology

[0002] High-voltage circuit breakers are crucial electrical equipment in power systems. During the closing operation of a high-voltage circuit breaker, overvoltages can occur on transmission lines. These overvoltages can easily damage electrical equipment on transmission lines and affect the stable operation of the power system. To limit and eliminate overvoltages on transmission lines, a closing resistor is typically installed in parallel in the main circuit, and a resistor disconnector connected in series with the closing resistor is used to control the connection and disconnection of the closing resistor from the power system. Before the main circuit breaker closes, the resistor disconnector closes first, dissipating the overvoltage in the closing resistor and ensuring that the voltage across the main circuit breaker remains normal when the main circuit breaker closes.

[0003] However, for existing resistor breaks, when the moving contact comes into contact with the stationary contact, the contact is prone to excessive erosion, resulting in a low service life of the resistor break. Utility Model Content

[0004] The purpose of this invention is to address the problems existing in the background technology by proposing a resistance break structure that can shorten the pre-breakdown time by blowing air when the moving contact and the stationary contact are in contact, thereby avoiding excessive contact erosion and extending the service life of the resistance break.

[0005] The present invention provides a resistance break structure, comprising a moving contact mechanism and a stationary contact mechanism. The moving contact mechanism includes an inner through-wall connecting contact seat and a moving contact component slidably and sealed on the connecting contact seat. The moving contact component has a moving side air passage connecting the inner and outer sides of the connecting contact seat. The stationary contact mechanism includes an inner through-wall guide cylinder and a stationary contact component slidably and sealed on the guide cylinder. The stationary contact component has a stationary side air passage connecting the inner and outer sides of the guide cylinder, and the stationary contact component faces the moving contact component.

[0006] Preferably, the moving contact assembly includes an insulating pull rod, a moving side conductive tube, and a moving contact connected in sequence. The moving side air passage includes a first moving side air passage that passes through the moving side conductive tube and a second moving side air passage that passes through the moving contact. One end of the first moving side air passage is located inside the connecting contact seat, and the other end is connected to the second moving side air passage.

[0007] Preferably, the insulating pull rod and the moving side conductive tube are connected by a connector.

[0008] Preferably, the stationary contact assembly includes a stationary side conductive tube, a stationary contact, and a return spring tensioned between the guide cylinder and the stationary side conductive tube. The stationary contact is installed at the outer end of the stationary side conductive tube. The stationary side air passage includes a stationary side air passage one that passes through the stationary side conductive tube and a stationary side air passage two that passes through the stationary contact. The stationary side air passage one and the stationary side air passage two are connected.

[0009] Preferably, the outer end of the stationary conductive tube has a protruding limiting platform.

[0010] Preferably, conductive springs are electrically connected between the end of the contact seat and the moving side conductive tube, as well as between the guide cylinder and the stationary side conductive tube.

[0011] Preferably, the outer periphery of the connector is provided with a guide device 1 that is slidably and sealingly connected to the inner side wall of the connector seat, and a guide device 2 is slidably and sealingly connected between the end of the connector seat and the moving side conductive tube, and between the end of the guide cylinder and the stationary side conductive tube.

[0012] Preferably, the outer periphery of the connector is provided with a slot 1 for mounting the guide device 1, and the inner sides of the end of the connecting contact seat and the end of the guide cylinder are provided with slots 2 for mounting the corresponding guide device 2.

[0013] Preferably, a moving-side shield is connected to the outer periphery of the contact seat via a bolt joint, and a stationary-side shield is connected to the outer periphery of the guide cylinder via a bolt joint.

[0014] Compared with the prior art, the present invention has the following beneficial technical effects: When the moving contact and the stationary contact are in contact, the present invention enables the moving contact mechanism to discharge the gas inside the connecting contact seat through the moving side air passage by moving the moving contact assembly, and the stationary contact mechanism to discharge the gas inside the guide cylinder through the stationary side air passage by moving the stationary contact assembly. This allows the pre-breakdown time to be shortened by blowing air, avoids excessive contact erosion, and extends the service life of the resistance break. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the resistor break structure according to an embodiment of the present invention;

[0016] Figure 2 for Figure 1 A sectional view along line AA.

[0017] Reference numerals in the attached drawings: 1. Connecting contact seat; 2. Insulating pull rod; 3. Moving side conductive tube; 301. Moving side air passage one; 4. Moving contact; 401. Moving side air passage two; 5. Conductive spring; 6. Guide device one; 7. Guide device two; 8. Moving side shield; 9. Guide cylinder; 10. Stationary side conductive tube; 101. Stationary side air passage one; 102. Limiting platform; 11. Stationary contact; 111. Stationary side air passage two; 12. Return spring; 13. Stationary side shield; 14. Bolt joint. Detailed Implementation

[0018] like Figure 1 and Figure 2 As shown in the figure, the resistor break structure proposed in this embodiment includes a moving contact mechanism and a stationary contact mechanism.

[0019] The moving contact mechanism includes a connecting contact seat 1 with an inner through-wall and a moving contact assembly that is slidably and sealingly disposed on the connecting contact seat 1. The moving contact assembly has a moving side air passage connecting the inner and outer sides of the connecting contact seat 1. Figure 2 As shown, a moving-side shield 8 is connected to the outer periphery of the contact seat 1 via a bolt joint 14, and the shield structure is used to extinguish the arc.

[0020] The moving contact assembly includes an insulating pull rod 2, a moving-side conductive tube 3, and a moving contact 4 connected in sequence. The insulating pull rod 2 and the moving-side conductive tube 3 are specifically connected by a connector. The moving-side air passage includes a first moving-side air passage 301 that passes through the moving-side conductive tube 3 and a second moving-side air passage 401 that passes through the moving contact 4. One end of the first moving-side air passage 301 is located inside the connecting contact seat 1, and the other end is connected to the second moving-side air passage 401. When the insulating pull rod 2 moves towards the stationary contact mechanism, the gas inside the connecting contact seat 1 is squeezed out through the first moving-side air passage 301 and the second moving-side air passage 401. The diameter of the outlet at the outer end of the second moving-side air passage 401 is 10 mm.

[0021] The stationary contact mechanism includes a guide cylinder 9 that extends through the inner side and a stationary contact assembly that is slidably and sealingly mounted on the guide cylinder 9. The outer end of the guide cylinder 9 is sealed, and a shield smaller than the stationary side shield is provided at the outer end. The stationary contact assembly has a stationary side air passage connecting the inner and outer sides of the guide cylinder 9, and the stationary contact assembly faces the moving contact assembly. Figure 2 As shown, a stationary shield 13 is connected to the outer periphery of the guide cylinder 9 via bolt joints 14, utilizing the shielding structure for arc extinguishing. The stationary contact assembly includes a stationary conductive tube 10, a stationary contact 11, and a return spring 12 tensioned between the guide cylinder 9 and the stationary conductive tube 10. The outer end of the stationary conductive tube 10 has a protruding limiting platform 102 to prevent the return spring 12 from being compressed when the closing speed is too fast. The stationary contact 11 is installed at the outer end of the stationary conductive tube 10. The stationary air passage includes a first stationary air passage 101 that passes through the stationary conductive tube 10 and a second stationary air passage 111 that passes through the stationary contact 11. The first stationary air passage 101 and the second stationary air passage 111 are connected. When the stationary contact 11 moves toward the return spring 12, the gas inside the guide cylinder 9 is squeezed out by the stationary side conductive tube 10, specifically through the stationary side air passage 101 and the stationary side air passage 111. The diameter of the air outlet at the outer end of the stationary side air passage 111 is 10mm.

[0022] like Figure 1 As shown, conductive springs 5 ​​are electrically connected between the end of the connecting contact seat 1 and the moving side conductive tube 3, and between the guide cylinder 9 and the stationary side conductive tube 10. One conductive spring 5 is used to pass current between the connecting contact seat 1 and the moving side conductive tube 3, and another conductive spring 5 is used to pass current between the guide cylinder 9 and the stationary side conductive tube 10.

[0023] like Figure 1As shown, a guide device 6 is provided on the outer periphery of the connector, which is slidably and sealingly connected to the inner wall of the connecting contact seat 1. Guide devices 7 are also slidably and sealingly connected between the end of the connecting contact seat 1 and the moving-side conductive tube 3, and between the end of the guide cylinder 9 and the stationary-side conductive tube 10. These guide devices guide the movement of related components, ensuring coaxiality of the movement and enabling precise docking of the moving contact 4 and the stationary contact 11. A slot 1 for mounting the guide device 6 is provided on the outer periphery of the connector, improving the installation reliability of the guide device 6. A slot 2 for mounting the corresponding guide device 7 is provided on the inner surface of both the end of the connecting contact seat 1 and the end of the guide cylinder 9, improving the installation reliability of the guide device 7.

[0024] The insulating rod 2 is driven to move linearly back and forth by an external drive structure, enabling the closing and opening of the resistance break structure. When the moving contact 4 and the stationary contact 11 are in contact, the circuit is closed; when the moving contact 4 disengages from the stationary contact 11, the circuit is open. During closing, the moving contact 4 contacts the stationary contact 11, and then the stationary contact 11 and the moving contact 4 move together to the target position (i.e., the final closed position), compressing the return spring 12. During opening, the moving contact 4 moves in the opposite direction, and its opening speed is higher than that of the stationary contact 11. Upon opening, it disengages from the contact, and the stationary contact 11 moves to the open position under the action of the return spring 12.

[0025] In this embodiment, when the moving contact 4 and the stationary contact 11 are in contact, the moving contact mechanism can discharge the gas inside the connecting contact seat 1 through the moving side air passage by moving the moving contact assembly, and the stationary contact mechanism can discharge the gas inside the guide cylinder 9 through the stationary side air passage by moving the stationary contact assembly. This can shorten the pre-breakdown time by blowing air, avoid excessive contact erosion, and extend the service life of the resistance break.

[0026] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited thereto. Various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention.

Claims

1. A resistor break structure, characterized in that, include: The moving contact mechanism includes an inner through-hole connecting contact seat (1) and a moving contact assembly that is slidably sealed on the connecting contact seat (1). The moving contact assembly has a moving side air passage that connects the inner and outer sides of the connecting contact seat (1). The static contact mechanism includes an inner through guide cylinder (9) and a static contact assembly that is slidably sealed on the guide cylinder (9). The static contact assembly has a static side air passage that connects the inner and outer sides of the guide cylinder (9). The static contact assembly faces the moving contact assembly.

2. The resistor break structure according to claim 1, characterized in that, The moving contact assembly includes an insulating pull rod (2), a moving side conductive tube (3), and a moving contact (4) connected in sequence. The moving side air passage includes a moving side air passage one (301) that passes through the moving side conductive tube (3) and a moving side air passage two (401) that passes through the moving contact (4). One end of the moving side air passage one (301) is located inside the connecting contact seat (1), and the other end is connected to the moving side air passage two (401).

3. The resistor break structure according to claim 2, characterized in that, The insulating pull rod (2) and the moving side conductive tube (3) are connected by a connector.

4. The resistor break structure according to claim 3, characterized in that, The stationary contact assembly includes a stationary conductive tube (10), a stationary contact (11), and a return spring (12) tensioned between the guide tube (9) and the stationary conductive tube (10). The stationary contact (11) is installed at the outer end of the stationary conductive tube (10). The stationary air passage includes a stationary air passage one (101) that passes through the stationary conductive tube (10) and a stationary air passage two (111) that passes through the stationary contact (11). The stationary air passage one (101) and the stationary air passage two (111) are connected.

5. A resistor break structure according to claim 4, characterized in that, The outer end of the stationary conductive tube (10) has a protruding limiting platform (102).

6. The resistor break structure according to claim 4, characterized in that, Conductive springs (5) are electrically connected between the end of the contact seat (1) and the moving side conductive tube (3), as well as between the guide cylinder (9) and the stationary side conductive tube (10).

7. A resistor break structure according to claim 4, characterized in that, The outer periphery of the connector is provided with a guide device 1 (6) that is slidably and sealingly connected to the inner wall of the connecting contact seat (1). The end of the connecting contact seat (1) and the moving side conductive tube (3) and the end of the guide cylinder (9) and the stationary side conductive tube (10) are both slidably and sealingly connected with a guide device 2 (7).

8. A resistor break structure according to claim 7, characterized in that, The connector has a slot 1 for mounting the guide device 1 (6) on its outer periphery, and slot 2 for mounting the corresponding guide device 2 (7) is provided on the inner side of the end of the connecting contact seat (1) and the end of the guide cylinder (9).

9. A resistor break structure according to claim 1, characterized in that, The outer periphery of the contact seat (1) is connected to the moving side shield (8) via bolt joint (14), and the outer periphery of the guide cylinder (9) is connected to the stationary side shield (13) via bolt joint (14).

Images