Solid-sealed polar pole with built-in isolating switch
By incorporating an isolation knife in the fixed sealing pole column, the problems of complex assembly, large volume and poor contact caused by the external isolation knife in the prior art are solved, and the circuit breaker is miniaturized and the service life is extended.
Patent Information
- Application Number
- CN202411696208.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-25
- Publication Date
- 2025-02-21
AI Technical Summary
In the existing solid seal pole column, the isolation knife is arranged on the outside, resulting in complex assembly and large volume, which is not conducive to miniaturization. At the same time, the isolation knife is exposed to the outside, which is prone to rust and damage, resulting in poor contact.
A solid sealing pole column with built-in isolation switch is designed. The isolation knife is arranged in the first cavity of the solid sealing pole column. The isolation knife is driven by the isolation operation shaft to realize the dual-broken isolation function, and the outer shell seals and protects the isolation knife.
The overall structure of the circuit breaker is miniaturized, which reduces assembly difficulty, reduces rust and damage of the isolation knife, improves poor contact problems, and extends service life.
Smart Images
Figure CN119495526A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of electrical equipment, and in particular to a sealed pole with a built-in isolating switch. Background Art
[0002] The sealed pole is the main component of the high-voltage vacuum circuit breaker. The sealed pole embeds the vacuum interrupter and the related conductive parts of the circuit breaker into the solid insulating material to form the pole, making the entire circuit breaker pole an integral whole.
[0003] In the prior art, in order to facilitate safe maintenance of the circuit breaker, an isolating knife is provided outside the sealed pole to isolate the circuit.
[0004] Regarding the above technical solution, the inventor believes that the isolating knife is arranged on the outside of the sealed pole. On the one hand, the assembly is more complicated and the volume is larger after assembly, which is not conducive to the miniaturization of the overall structure of the circuit breaker; on the other hand, the isolating knife is exposed to the external environment, and will rust and be damaged after long-term use, thereby causing poor contact problems. Summary of the invention
[0005] In order to optimize the overall structure of the circuit breaker, reduce the difficulty of assembly, improve the problem of poor contact, and extend the overall service life, the present application provides a sealed pole with a built-in isolating switch.
[0006] The present application provides a sealed pole with a built-in isolating switch, which adopts the following technical solution:
[0007] A sealed pole with a built-in isolating switch, comprising an outer shell, a first conductor and a second conductor are arranged on the outer shell, a vacuum interrupter is arranged inside the outer shell, a static contact is arranged at one end of the vacuum interrupter, and a moving contact is arranged at the other end, the first conductor is connected to the moving contact, a first cavity is arranged on the outer shell, an isolating knife is arranged in the first cavity, an isolating operation shaft is arranged on the isolating knife, the two ends of the isolating knife are respectively a first contact end and a second contact end, and the isolating operation shaft can drive the isolating knife to realize the conversion between the first position and the second position;
[0008] When the isolating knife is in the first position, the first contact end is connected to the stationary contact, and the second contact end is connected to the second conductor;
[0009] When the isolating blade is in the second external position, a first break is formed between the first contact end and the stationary contact, and a second break is formed between the second contact end and the second conductor.
[0010] Optionally, a second cavity is provided on the outer shell, a flexible connection is provided in the second cavity, one end of the flexible connection is connected to the first conductor, and the other end is connected to the moving contact.
[0011] Optionally, a current transformer is provided in the outer shell, and the current transformer is provided outside the first conductor.
[0012] Optionally, a first interface is provided on the outer shell, one end of the first conductor is provided in the first interface, and the other end of the first conductor is provided in the second cavity.
[0013] Optionally, a second interface is provided on the outer shell, one end of the second conductor is provided in the second interface, and the other end of the second conductor is provided in the first cavity.
[0014] Optionally, the outer shell is provided with an axial hole for the isolation operation shaft to pass through, and the axial hole is communicated with the first cavity.
[0015] In summary, the present application includes at least one of the following beneficial technical effects:
[0016] 1. The present application adopts a built-in isolating knife. Compared with the existing external isolating switch structure, on the one hand, the present application sets the isolating knife in the first cavity in the sealed pole, and the overall structure is more compact, which is conducive to the miniaturization of the overall structure of the circuit breaker; on the other hand, the isolating knife and the sealed pole do not need to be assembled on site, which reduces the difficulty of assembly; in addition, the outer shell can seal and protect the isolating knife, thereby reducing the possibility of rust and damage to the isolating knife, thereby improving the problem of poor contact and helping to extend the overall service life.
[0017] 2. The isolating knife of the present application adopts a rotating double-break isolating knife. Compared with the single-break isolating knife, it has a double-sided isolation function, higher isolation reliability, and is conducive to improving the safety of use.
[0018] 3. The present application realizes the connection between the first conductor and the moving contact through a soft connection, thereby preventing the moving contact from being subjected to torque during movement, protecting its safety performance in use, and ensuring the stable and reliable use of the sealed pole.
[0019] 4. By arranging the current transformer inside the sealed pole, the two form a highly integrated whole, which is conducive to saving the volume occupied by the current transformer and saving the structural parts necessary for installing and fixing the current transformer. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 It is a schematic structural diagram of a sealed pole of a built-in isolating switch according to an embodiment of the present application, wherein the isolating knife is in a first position.
[0021] Figure 2 It is a structural schematic diagram showing that the isolation knife in the embodiment of the present application is in the second position.
[0022] Figure 3 It is a schematic diagram of the structure of the outer shell and the shaft hole in the embodiment of the present application.
[0023] Explanation of the accompanying drawings: 1. outer shell; 11. first cavity; 12. second cavity; 13. axial hole; 14. first interface; 15. second interface; 2. first conductor; 3. second conductor; 4. vacuum arc extinguishing chamber; 5. static contact; 51. static contact; 52. upper outlet; 6. moving contact; 61. moving contact; 62. pull rod; 7. flexible connection; 8. current transformer; 9. isolating knife; 91. first contact terminal; 92. second contact terminal; 93. isolating operating shaft; 94. first break; 95. second break. DETAILED DESCRIPTION
[0024] The following is combined with Figure 1-3 , further details of this application are given.
[0025] Example:
[0026] The embodiment of the present application discloses a sealed pole with a built-in isolating switch.
[0027] Reference Figure 1 A sealed pole with a built-in disconnector includes an outer shell 1, a first conductor 2 and a second conductor 3 are arranged on the outer shell 1, and a vacuum interrupter 4 is arranged in the outer shell 1. In this embodiment, the outer shell 1 is made of epoxy resin, and the outer shell 1, the first conductor 2, the second conductor 3 and the vacuum interrupter 4 are integrally cast, and the outer shell 1 wraps the vacuum interrupter 4 and partially wraps the first conductor 2 and the second conductor 3.
[0028] Reference Figure 1 , a static contact 5 is provided at the upper end of the vacuum interrupter 4, and a dynamic contact 6 is provided at the lower end. The static contact 5 includes a static contact 51 and an upper outlet 52. The static contact 51 is fixed in the vacuum interrupter 4, and the upper outlet 52 is fixedly connected to the static contact 51 by bolts; the dynamic contact 6 includes a dynamic contact 61 and a pull rod 62. The dynamic contact 61 is movably arranged in the vacuum interrupter 4, and the pull rod 62 is arranged on the outside of the vacuum interrupter 4 and can drive the dynamic contact 61 to move up and down. When the dynamic contact 61 touches the static contact 51, the closing operation is realized; when the dynamic contact 61 is separated from the static contact 51, the opening operation is realized.
[0029] Reference Figure 1 The outer shell 1 is provided with a second cavity 12 for accommodating the pull rod 62, and a flexible connection 7 is also provided in the second cavity 12. The pull rod 62 passes through a hole at one end of the flexible connection 7 and is fixedly connected to the moving contact 61, and the end of the flexible connection 7 away from the moving contact 6 is fixedly connected to the first conductor 2. In this way, the connection between the first conductor 2 and the moving contact 6 is achieved through the flexible connection 7, thereby preventing the moving contact 6 from being subjected to torsion during movement, protecting its safety performance in use, and ensuring the stable and reliable use of the sealed pole.
[0030] Reference Figure 1 A current transformer 8 is also provided inside the outer shell 1. The current transformer 8 is provided outside the first conductor 2 and is integrally sealed with the outer shell 1. In this way, by arranging the current transformer 8 inside the sealed pole, the two form a highly integrated whole, which is conducive to saving the volume occupied by the current transformer 8 and saving the necessary structural parts for installing and fixing the current transformer 8.
[0031] Reference Figure 1-3 The outer shell 1 is provided with a first cavity 11, in which a spacer knife 9 is provided, and the two ends of the spacer knife 9 are respectively a first contact end 91 and a second contact end 92, and an isolation operation shaft 93 is fixedly connected to the middle of the spacer knife 9, and the isolation operation shaft 93 can drive the spacer knife 9 to realize the conversion between the first position and the second position. The outer shell 1 is provided with an axial hole 13 for the isolation operation shaft 93 to pass through, and the axial hole 13 is connected to the first cavity 11.
[0032] When the isolating knife 9 is in the first position, the first contact end 91 is connected to the static contact 5, and the second contact end 92 is connected to the second conductor 3. One end of the upper outlet 52 away from the static contact 51 extends into the first cavity 11, so that the first contact end 91 and the upper outlet 52 are in contact when the isolating knife 9 is in the first position. When the isolating knife 9 is in the second position, a first break 94 is formed between the first contact end 91 and the static contact 5, and a second break 95 is formed between the second contact end 92 and the second conductor 3. In this embodiment, the first conductor 2 is an incoming conductor, the second conductor 3 is an outgoing conductor, and the materials of the first conductor 2 and the second conductor 3 are both copper rods; the first position is a conducting position, and the second position is an isolating position.
[0033] The present application adopts a built-in isolating knife 9. Compared with the existing external isolating switch structure, on the one hand, the present application sets the isolating knife 9 in the first cavity 11 in the sealed pole, and the overall structure is more compact, which is conducive to the miniaturization of the overall structure of the circuit breaker; on the other hand, the isolating knife 9 and the sealed pole do not need to be assembled on site, which reduces the difficulty of assembly; in addition, the outer shell 1 can seal and protect the isolating knife 9, thereby reducing the possibility of rust and damage to the isolating knife 9, thereby improving the problem of poor contact and helping to extend the overall service life.
[0034] In addition, the isolating knife 9 of the present application adopts a rotating double-break isolating knife 9, which has a double-sided isolation function compared to the single-break isolating knife 9, and has higher isolation reliability, which is conducive to improving the safety of use.
[0035] Reference Figure 1 and Figure 3, a first interface 14 is provided at one end of the outer shell 1, and a second interface 15 is provided at the other end, wherein one end of the first conductor 2 is provided in the first interface 14, and the other end is provided in the second cavity 12; one end of the second conductor 3 is provided in the second interface 15, and the other end is provided in the first cavity 11. In this embodiment, the first interface 14 is an outlet interface, so as to be connected to an outlet bushing; the second interface 15 is an incoming interface, so as to be connected to an incoming bushing.
[0036] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.
Claims
1. A sealed pole with a built-in isolating switch, characterized in that: The invention comprises an outer shell (1), wherein a first conductor (2) and a second conductor (3) are provided on the outer shell (1), a vacuum arc extinguishing chamber (4) is provided inside the outer shell (1), a static contact (5) is provided at one end of the vacuum arc extinguishing chamber (4), and a moving contact (6) is provided at the other end, the first conductor (2) is connected to the moving contact (6), a first cavity (11) is provided on the outer shell (1), an isolating knife (9) is provided in the first cavity (11), an isolating operating shaft (93) is provided on the isolating knife (9), the two ends of the isolating knife (9) are respectively a first contact end (91) and a second contact end (92), and the isolating operating shaft (93) can drive the isolating knife (9) to realize the conversion between the first position and the second position; When the isolating blade (9) is in a first position, the first contact end (91) is in conduction with the stationary contact (5), and the second contact end (92) is in conduction with the second conductor (3); When the isolating blade (9) is in the second external position, a first break (94) is formed between the first contact end (91) and the stationary contact (5), and a second break (95) is formed between the second contact end (92) and the second conductor (3).
2. The sealed pole of a built-in isolating switch according to claim 1, characterized in that: The outer shell (1) is provided with a second cavity (12), and a flexible connection (7) is provided in the second cavity (12). One end of the flexible connection (7) is connected to the first conductor (2), and the other end is connected to the moving contact (6).
3. The sealed pole of a built-in isolating switch according to claim 1, characterized in that: A current transformer (8) is arranged inside the outer shell (1), and the current transformer (8) is arranged outside the first conductor (2).
4. The sealed pole of a built-in isolating switch according to claim 2, characterized in that: The outer shell (1) is provided with a first interface (14); one end of the first conductor (2) is arranged in the first interface (14), and the other end is arranged in the second cavity (12).
5. The sealed pole of a built-in isolating switch according to claim 1, characterized in that: The outer shell (1) is provided with a second interface (15); one end of the second conductor (3) is arranged in the second interface (15), and the other end is arranged in the first cavity (11).
6. The sealed pole of a built-in isolating switch according to claim 1, characterized in that: The outer shell (1) is provided with an axial hole (13) for the isolation operation shaft (93) to pass through, and the axial hole (13) is communicated with the first cavity (11).