High-voltage vacuum circuit breaker

Abstract

The utility model provides a high-voltage vacuum circuit breaker, which relates to the technical field of vacuum circuit breakers and comprises a circuit breaking shell, an inner cavity arranged in the circuit breaking shell is communicated with an insulating sleeve and a guide cylinder, and a vacuum arc-extinguishing chamber is arranged in the insulating sleeve. When the moving-end conducting rod is completely in place, the moving contact on the outer side gradually covers the outer surface of the contact end on the static-end conducting rod, so that the moving contact and the contact end can be meshed together more accurately, the tightness and the stability of electrical connection are ensured, when the moving-end conducting rod is completely in place, the static contact is tightly combined with the annular end, and the contact end is exactly embedded into the annular groove of the moving contact; the multi-point contact structure greatly increases the effective contact area, reduces the contact resistance, and ensures high current-carrying capacity and good thermal stability, so that when the high-voltage vacuum circuit breaker is in a closed state, the connection between the moving contact and the static contact is firm and reliable, and a safe and efficient current transmission channel is provided for an electric power system.

Description

Technical Field

[0001] The utility model relates to the technical field of vacuum circuit breakers, in particular to a high-voltage vacuum circuit breaker. Background Art

[0002] High-voltage vacuum circuit breaker is a switching device used in high-voltage power systems. Its core component is the vacuum interrupter. The interior of the vacuum interrupter uses a high vacuum environment as the insulating medium, forming an excellent arc extinguishing ability between the moving contact and the static contact. When the circuit breaker is connecting or disconnecting the circuit, the control device drives the moving contact to move toward the static contact to achieve closing or separation.

[0003] In the prior art, an insulating sleeve and a guide sleeve are arranged inside the circuit breaker housing. The contact mode between the moving contact and the static contact in the vacuum arc chamber inside the insulating sleeve is usually a point contact or surface contact design. However, when the contact area between the contacts gradually decreases due to factors such as wear, oxidation or manufacturing tolerance, it will directly lead to a significant increase in contact resistance. This phenomenon is particularly prominent during long-term continuous operation. Because with the increase of contact resistance, the proportion of electrical energy converted into thermal energy increases, thereby causing the local temperature of the contact to rise sharply. When high-voltage current passes through, the small contact area will cause the current density per unit area to increase, thereby generating more heat. This excessive heating not only aggravates the physical loss and chemical reaction rate of the contact material, but may also cause serious ablation of the contact surface, reduced hardness and deformation, and other problems, seriously affecting the normal working performance and service life of the vacuum arc chamber.

[0004] Therefore, it is necessary to provide a new high-voltage vacuum circuit breaker to solve the above technical problems. Utility Model Content

[0005] In order to solve the above technical problems, the utility model provides a high-voltage vacuum circuit breaker.

[0006] The utility model provides a high-voltage vacuum circuit breaker comprising a circuit breaker shell, wherein the circuit breaker shell is provided with an inner cavity connected with an insulating sleeve and a guide sleeve, a vacuum arc extinguishing chamber is provided inside the insulating sleeve, one end of the insulating sleeve is fixedly connected with a static end conductive rod, one side of the static end conductive rod is fixedly connected with a static contact and a contact end in sequence, and a contact groove is formed between the static contact and the contact end, one end of the guide sleeve adjacent to the insulating sleeve is slidably connected with a movable end conductive rod, the static end conductive rod and the movable end conductive rod are located in the vacuum arc extinguishing chamber, one end of the movable end conductive rod adjacent to the static end conductive rod is fixedly connected with a movable contact, one end of the movable contact away from the movable end conductive rod is fixedly connected with a protruding end and a ring end, the ring end is located outside the protruding end, and a ring groove is formed between the movable contact and the ring end and the protruding end.

[0007] Furthermore, a control component is provided on the top of the circuit breaker housing, and the control component includes a control switch, and two ends of the control switch are rotatably connected to the top of the circuit breaker housing.

[0008] Furthermore, a guide ring is fixedly connected to the inner wall of the guide cylinder adjacent to one end of the static end conductive rod, an annular hole is penetrated through the inner wall of the guide ring, and the movable end conductive rod can slide horizontally along the side wall of the annular hole.

[0009] Furthermore, an elastic member is arranged on the outside of the movable end conductive rod, and the elastic member is a spring. The spring radially surrounds the outer surface of the movable end conductive rod on the outside, and both ends of the spring are fixedly connected to the side wall of the guide ring and the side wall of the movable contact respectively.

[0010] Furthermore, the outer cross-section of the contact end near the movable conductive rod tends to gradually decrease, the inner cross-section of the contact end near the movable conductive rod tends to gradually increase, and the cross-section of the protruding end near the static conductive rod tends to gradually decrease.

[0011] Furthermore, the cross-sectional shape of the contact end matches the annular groove, and the cross-sectional shape of the protruding end matches the contact groove.

[0012] Furthermore, a fixing bracket is fixedly connected inside the circuit breaker housing, and two ends of the fixing bracket are fixedly connected to the insulating sleeve and the guide cylinder respectively.

[0013] Compared with the related art, the high voltage vacuum circuit breaker provided by the utility model has the following beneficial effects:

[0014] The high-voltage vacuum circuit breaker drives the moving end conductive rod to slide horizontally along the guide tube toward the static end conductive rod. When the moving end conductive rod gradually approaches the static end conductive rod, the protruding end at its front end can be more accurately aligned with and guided into the preset contact groove on the static end conductive rod due to the gradually shrinking trend in the design, thereby achieving accurate initial contact. At the same time, as the moving end conductive rod continues to advance, the outer moving contact will gradually cover the outer surface of the contact end on the static end conductive rod, so that the two can be more accurately engaged together to ensure the tightness and stability of the electrical connection. When the moving end conductive rod is fully in place, the static contact will be tightly combined with the annular end, and the contact end will be just embedded in the annular groove of the moving contact. The multi-point contact structure greatly increases the effective contact area, reduces the contact resistance, and ensures high current carrying capacity and good thermal stability. Therefore, when the high-voltage vacuum circuit breaker is in a closed state, the connection between the moving contact and the static contact is both firm and reliable, providing a safe and efficient current transmission channel for the power system. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A schematic diagram of the overall structure of the high-voltage vacuum circuit breaker provided by the utility model;

[0016] Figure 2 A partial cross-sectional structural schematic diagram of a high-voltage vacuum circuit breaker provided by the utility model;

[0017] Figure 3 A schematic cross-sectional view of the insulating sleeve and the guide sleeve provided by the utility model;

[0018] Figure 4 A schematic diagram of the state structure of the static end conductive rod and the dynamic end conductive rod provided by the utility model;

[0019] Figure 5 A schematic diagram of the structure of the static end conductive rod provided by the utility model;

[0020] Figure 6 This is a structural schematic diagram of the movable end conductive rod provided by the utility model.

[0021] Numbers in the figure: 1. Circuit breaker housing; 2. Control switch; 3. Fixed bracket; 4. Insulating sleeve; 5. Vacuum interrupter; 6. Static end conductive rod; 7. Static contact; 8. Contact terminal; 9. Contact groove; 10. Moving end conductive rod; 11. Moving contact; 12. Ring terminal; 13. Raised terminal; 14. Ring groove; 15. Guide cylinder; 16. Guide ring; 17. Spring. DETAILED DESCRIPTION

[0022] The utility model is further described below in conjunction with the accompanying drawings and implementation modes.

[0023] In the specific implementation process, Figures 1 to 6 As shown, the high-voltage vacuum circuit breaker includes a circuit breaker housing 1, and the circuit breaker housing 1 is provided with an inner cavity connected to an insulating sleeve 4 and a guide sleeve 15. The insulating sleeve 4 provides good electrical insulation performance to prevent current leakage. A vacuum arc extinguishing chamber 5 is provided inside the insulating sleeve 4. A static end conductive rod 6 is fixedly connected to one end of the insulating sleeve 4. The static end conductive rod 6 remains relatively still during operation. A static contact 7 and a contact terminal 8 are fixedly connected to one side of the static end conductive rod 6 in sequence, and the static contact 7 and the contact terminal 8 form a contact groove 9. The guide sleeve 15 is slidably connected to a movable end conductive rod 10 at one end adjacent to the insulating sleeve 4. The guide sleeve 15 plays a role in The function of guiding and supporting the movement of the moving end conductive rod 10 is that the static end conductive rod 6 and the moving end conductive rod 10 are located in the vacuum arc extinguishing chamber 5. The end of the moving end conductive rod 10 adjacent to the static end conductive rod 6 is fixedly connected with a moving contact 11, which helps to improve contact stability, reduce wear, and ensure that the current can quickly extinguish the arc at the moment of disconnection, thereby reducing the risk of overvoltage and arc reignition. The end of the moving contact 11 away from the moving end conductive rod 10 is fixedly connected with a protruding end 13 and a ring end 12, the ring end 12 is located outside the protruding end 13, and an annular groove 14 is formed between the moving contact 11, the ring end 12 and the protruding end 13;

[0024] A control member is provided at the top of the circuit breaker housing 1. The control member includes a control switch 2. Both ends of the control switch 2 are rotatably connected to the top of the circuit breaker housing 1. A guide ring 16 is fixedly connected to the inner wall of the guide cylinder 15 adjacent to one end of the static end conductive rod 6. An annular hole is penetrated through the inner wall of the guide ring 16, and the movable end conductive rod 10 can slide horizontally along the side wall of the annular hole. An elastic member is provided on the outer side of the movable end conductive rod 10. The elastic member is a spring 17. The spring 17 radially surrounds the outer surface of the movable end conductive rod 10 on the outer side. Both ends of the spring 17 are fixedly connected to the side wall of the guide ring 16 and the side wall of the movable contact 11 respectively.

[0025] During operation, the movable end conductive rod 10 can slide horizontally on the inner wall of the annular hole of the guide ring 16, ensuring stability and precise guidance during the operation;

[0026] When the movable end conductive rod 10 completes the opening or closing action, the spring 17 will provide the necessary restoring force to push the movable end conductive rod 10 back to the initial position, while ensuring that the movable and static contacts 7 maintain a constant and appropriate contact pressure, thereby effectively improving the operating performance and service life of the circuit breaker;

[0027] The outer cross section of the contact terminal 8 near the end of the movable conductive rod 10 is gradually reduced, the inner cross section of the contact terminal 8 near the end of the movable conductive rod 10 is gradually expanded, and the cross section of the protruding terminal 13 near the end of the static conductive rod 6 is gradually reduced. The cross-sectional shape of the contact terminal 8 matches the annular groove 14, and the cross-sectional shape of the protruding terminal 13 matches the contact groove 9.

[0028] The cross section of the outer side of the end of the contact terminal 8 close to the movable conductive rod 10 is designed to be gradually reduced. This gradual structure helps to guide the movable contact 11 to accurately align and insert into the contact terminal 8, ensuring a close fit and good contact between the two.

[0029] The inner cross section of the contact terminal 8 near the end of the movable conductive rod 10 is gradually enlarged. This special shape design is conducive to increasing the contact area and providing enough space for a smooth transition when the movable contact 11 is inserted, thereby ensuring stable current transmission and reducing contact resistance.

[0030] The protruding end 13 is located at one end of the moving contact 11, and the cross section of the end close to the static end conductive rod 6 is also designed with a gradually decreasing trend. Such a design ensures that when the moving contact 11 moves toward the static end conductive rod 6, the protruding end 13 can be accurately aligned and enter the pre-set contact groove 9, thereby achieving accurate positioning and effective connection.

[0031] The overall cross-sectional shape of the contact terminal 8 matches the annular groove 14, while the cross-sectional shape of the protruding terminal 13 matches the contact groove 9. This ingenious matching mode enables the moving and static contacts 7 to form multi-point reliable contact when the circuit breaker is closed, greatly improving the stability and safety of the electrical connection, while also reducing the probability of poor contact caused by mechanical wear.

[0032] A fixing bracket 3 is fixedly connected inside the circuit breaker housing 1 , and two ends of the fixing bracket 3 are fixedly connected to the insulating sleeve 4 and the guide cylinder 15 respectively, so as to ensure the stability of the movement of the insulating sleeve 4 and the guide cylinder 15 .

[0033] Among them, the high-voltage vacuum circuit breaker is the NXB-125 circuit breaker, which has the ability to automatically distinguish between slow-changing leakage and sudden leakage for protection, ensuring the safety of the circuit.

[0034] The working principle provided by the utility model is as follows: when the utility model is implemented, the movable end conductive rod 10 is driven to slide horizontally along the guide cylinder 15 toward the static end conductive rod 6 by controlling the switch 2. When the movable end conductive rod 10 gradually approaches the static end conductive rod 6, the protruding end head 13 at the front end thereof can be more accurately aligned with the preset contact groove 9 on the static end conductive rod 6 and guided into the contact groove 9 due to the gradual shrinking trend in the design, thereby achieving accurate initial contact. At the same time, as the movable end conductive rod 10 continues to advance, the outer movable contact head 11 will gradually cover the outer surface of the contact end head 8 on the static end conductive rod 6. Thanks to the contact end The head 8 also has a gradually contracting design feature, and the two can fit together more accurately to ensure the tightness and stability of the electrical connection. When the moving end conductive rod 10 is fully in place, the static contact 7 will be tightly combined with the annular end 12, and the contact end 8 will be just embedded in the annular groove 14 of the moving contact 11. This multi-point contact structure greatly increases the effective contact area, reduces the contact resistance, and ensures high current carrying capacity and good thermal stability. Therefore, when the high-voltage vacuum circuit breaker is in the closed state, the connection between the moving contact 11 and the static contact 7 is both firm and reliable, providing a safe and efficient current transmission channel for the power system.

[0035] The circuits and controls involved in the present invention are all prior art and will not be described in detail here.

[0036] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. High voltage vacuum circuit breaker, characterized in that: The invention comprises a circuit breaker housing (1), wherein the circuit breaker housing (1) is provided with an inner cavity connected to an insulating sleeve (4) and a guide sleeve (15), wherein a vacuum arc extinguishing chamber (5) is provided inside the insulating sleeve (4), wherein one end of the insulating sleeve (4) is fixedly connected to a static end conductive rod (6), and one side of the static end conductive rod (6) is fixedly connected to a static contact (7) and a contact end (8) in sequence, and the static contact (7) and the contact end (8) form a contact groove (9), and an end of the guide sleeve (15) adjacent to the insulating sleeve (4) is slidably connected to a dynamic end conductive rod (6). The rod (10), the static end conductive rod (6) and the dynamic end conductive rod (10) are located in the vacuum interrupter (5); the end of the dynamic end conductive rod (10) adjacent to the static end conductive rod (6) is fixedly connected to a moving contact (11); the end of the dynamic contact (11) away from the dynamic end conductive rod (10) is fixedly connected to a protruding end (13) and an annular end (12); the annular end (12) is located outside the protruding end (13); and an annular groove (14) is formed between the moving contact (11), the annular end (12) and the protruding end (13).

2. The high voltage vacuum circuit breaker according to claim 1, characterized in that: A control component is provided on the top of the circuit breaker housing (1), and the control component comprises a control switch (2). Both ends of the control switch (2) are rotatably connected to the top of the circuit breaker housing (1).

3. The high voltage vacuum circuit breaker according to claim 2, characterized in that: A guide ring (16) is fixedly connected to the inner side wall of the guide cylinder (15) adjacent to one end of the static end conductive rod (6). An annular hole is formed through the inner side wall of the guide ring (16), and the dynamic end conductive rod (10) can slide horizontally along the side wall of the annular hole.

4. The high voltage vacuum circuit breaker according to claim 3, characterized in that: An elastic member is arranged outside the movable end conductive rod (10), and the elastic member is a spring (17). The spring (17) radially surrounds the outer surface of the movable end conductive rod (10) on the outside, and the two ends of the spring (17) are respectively fixedly connected to the side wall of the guide ring (16) and the side wall of the movable contact (11).

5. The high voltage vacuum circuit breaker according to claim 4, characterized in that: The outer cross-section of the contact terminal (8) adjacent to one end of the movable conductive rod (10) shows a gradually decreasing trend, the inner cross-section of the contact terminal (8) adjacent to one end of the movable conductive rod (10) shows a gradually increasing trend, and the cross-section of the protruding terminal (13) adjacent to one end of the stationary conductive rod (6) shows a gradually decreasing trend.

6. The high voltage vacuum circuit breaker according to claim 5, characterized in that: The cross-sectional shape of the contact end (8) matches the annular groove (14), and the cross-sectional shape of the protruding end (13) matches the contact groove (9).

7. The high voltage vacuum circuit breaker according to claim 6, characterized in that: A fixing bracket (3) is fixedly connected inside the circuit breaker housing (1), and two ends of the fixing bracket (3) are respectively fixedly connected to the insulating sleeve (4) and the guide sleeve (15).

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