High-voltage circuit breaker with shell sealing function

Abstract

The utility model relates to the technical field of circuit breaker sealing structures, and particularly discloses a high-voltage circuit breaker with a shell sealing function, which comprises a main box body, an arc extinguishing box arranged in the main box body, a static contact rod and a movable contact rod which is connected in the arc extinguishing box in a sliding manner and can be electrically connected with the static contact rod, the side wall of the main box body is provided with a conducting rod electrically connected with the movable contact rod and the static contact rod, and a driving mechanism for driving the movable contact rod to slide. The sealing assembly comprises a sealing seat which is arranged at the end part of the arc extinguishing box and is positioned between the arc extinguishing box and the movable feeler lever, a sleeve which is arranged in the arc extinguishing box and is attached to the sealing seat, and a fixing sleeve which is arranged in the arc extinguishing box and is attached to the sleeve; one end of the fixing sleeve extends between the sleeve and the movable feeler lever, and a first sealing ring sleeved on the movable feeler lever is arranged between the fixing sleeve and the sealing seat, so that the problem that sulfur hexafluoride gas is easy to leak at the contact part of a moving part and a static part due to the single sealing structure of a traditional sulfur hexafluoride circuit breaker is solved.

Description

Technical Field

[0001] The present application relates to the technical field of circuit breaker sealing structures, and specifically discloses a high-voltage circuit breaker with a shell sealing function. Background Art

[0002] High-voltage circuit breakers (also known as high-voltage switches) refer to electrical appliances with a rated voltage of 3kV and above, which are mainly used to open and close conductive circuits. According to the arc extinguishing medium used, they can be divided into oil circuit breakers, sulfur hexafluoride (SF6) circuit breakers, and vacuum circuit breakers.

[0003] Taking sulfur hexafluoride circuit breaker as an example, sulfur hexafluoride circuit breaker is a circuit breaker that uses sulfur hexafluoride (SF6) gas as arc extinguishing medium and insulating medium. Due to the excellent properties of this gas, the voltage and current parameters of a single break of this circuit breaker are much higher than those of compressed air circuit breakers and low-oil circuit breakers, and it does not require high gas pressure and a considerable number of series breaks. Normally, the arc extinguishing chamber and the support porcelain sleeve of the sulfur hexafluoride circuit breaker are filled with SF6 gas of rated pressure. In the process of the sulfur hexafluoride circuit breaker controlling the on and off of the circuit, the transmission mechanism usually controls the movement of the transmission shaft so that the moving contact and the static contact of the sulfur hexafluoride circuit breaker contact or disengage with each other. In this process, the existing sulfur hexafluoride circuit breaker has a single sealing structure and usually only uses a sealing ring for sealing, which leads to the problem of gas leakage at the contact point between the moving parts and the stationary parts of the sulfur hexafluoride circuit breaker. The leakage of sulfur hexafluoride gas not only easily affects the arc extinguishing performance of the arc extinguishing chamber, but also has an adverse effect on the surrounding environment and even threatens the personal safety of nearby workers. Therefore, in view of this, the inventor provides a high-voltage circuit breaker with a shell sealing function to solve the above problems. Utility Model Content

[0004] The utility model aims to solve the problem that sulfur hexafluoride gas leakage is easy to occur at the contact point between the moving parts and the stationary parts of the traditional sulfur hexafluoride circuit breaker due to the single sealing structure.

[0005] In order to achieve the above-mentioned purpose, the basic scheme of the utility model provides a high-voltage circuit breaker with a shell sealing function, including a main box, an arc extinguishing box arranged in the main box, and a static contact rod. A moving contact rod electrically connected to the static contact rod is slidably connected in the arc extinguishing box. The side wall of the main box is provided with a conductive rod electrically connected to the moving contact rod and the static contact rod respectively, and a driving mechanism for driving the moving contact rod to slide. It also includes a sealing assembly, which includes a sealing seat arranged at the end of the arc extinguishing box and located between the arc extinguishing box and the moving contact rod, a sleeve arranged in the arc extinguishing box and fitted with the sealing seat, and a fixed sleeve arranged in the arc extinguishing box and fitted with the sleeve. One end of the fixed sleeve extends between the sleeve and the moving contact rod and is provided with a first sealing ring sleeved on the moving contact rod between the sleeve and the sealing seat.

[0006] The principles and effects of this basic solution are:

[0007] Compared with the prior art, the utility model arranges the first sealing ring in the space enclosed by the sealing seat, the sleeve, the fixed sleeve and the moving contact rod, which not only can fix the first sealing ring through the fixed sleeve, but also makes the whole structure convenient and quick to install, and the first sealing tube can seal the contact surfaces between the moving contact rod, the sealing seat, the sleeve and the fixed sleeve, effectively improving the sealing performance of the sulfur hexafluoride gas in the arc extinguishing box, and solving the problem that the traditional sulfur hexafluoride circuit breaker is prone to sulfur hexafluoride gas leakage at the contact point between the moving parts and the stationary parts due to the single sealing structure.

[0008] Furthermore, the fixing sleeve is provided with a guide rod, which passes through the sleeve and the sealing seat and is threadedly connected with a fixing nut. The guide rod and the fixing nut are provided to facilitate installation and disassembly between the sealing seat, the sleeve and the fixing sleeve.

[0009] Furthermore, the guide rod comprises a smooth section respectively adapted to the sleeve and the sealing seat and a threaded section having a diameter smaller than the smooth section and capable of extending into the side wall of the sealing seat. By providing the smooth section and the threaded section, the sealing seat, the sleeve and the fixed sleeve can be tightly connected to each other while ensuring the sealing performance between the guide rod and the sleeve and the fixed sleeve.

[0010] Furthermore, the contact point between the fixed sleeve and the sleeve is provided with an annular groove which is mutually adapted and coaxial with the guide rod, and a second sealing ring is provided in the annular groove. The annular groove and the second sealing ring can improve the sealing performance between the sleeve and the fixed sleeve.

[0011] Furthermore, a notch is provided on one side of the sleeve close to the sealing seat, and the first sealing ring is fitted with the wall of the notch. The notch can further improve the sealing performance between the sleeve and the fixed sleeve.

[0012] Furthermore, a sealing groove is provided on one side of the fixed sleeve close to the movable contact rod, and a third sealing ring is provided in the sealing groove. The sealing groove and the third sealing ring can improve the sealing performance between the fixed sleeve and the movable contact rod.

[0013] Furthermore, the driving mechanism includes a hydraulic cylinder and a transmission shaft driven by the hydraulic cylinder and coaxially connected to the moving contact rod, and the sealing assembly is also provided between the transmission shaft and the side wall of the arc extinguishing box. This arrangement further improves the overall sealing performance of the arc extinguishing box. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0015] Figure 1 A schematic diagram of the internal structure of a high-voltage circuit breaker with a housing sealing function proposed in an embodiment of the present application is shown;

[0016] Figure 2 A schematic diagram of a sealing structure of a high-voltage circuit breaker with a shell sealing function proposed in an embodiment of the present application is shown. DETAILED DESCRIPTION

[0017] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined purpose of the utility model, the specific implementation method, structure, characteristics and effects of the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.

[0018] The figure marks in the drawings of the specification include: box body 1, transmission shaft 2, moving contact rod 3, static contact rod 4, conductive column 5, insulating porcelain ring 6, coupling 7, sealing assembly 8, arc extinguishing box 9, sealing seat 10, sleeve 11, fixing sleeve 12, guide rod 13, fixing bolt 14, first sealing ring 15, second sealing ring 16, third sealing ring 17, fourth sealing ring 18.

[0019] A high voltage circuit breaker with a housing sealing function, for example Figure 1 As shown, it includes a main box body 1, an arc extinguishing box 9 is arranged inside the main box body 1, and at least two conductive rods are arranged on the side wall of the main box body 1. The conductive rods extend out of the top of the main box body 1 and are protected by porcelain sleeves, etc., and are electrically connected to the external circuit; one of the conductive rods extends into the arc extinguishing box 9, and a moving contact rod 3 electrically connected to the conductive rod is arranged in the arc extinguishing box 9. Correspondingly, the moving contact rod 3 is slidably connected to the arc extinguishing box 9, a notch is provided on the side wall of the moving contact rod 3, and the end of the conductive column 5 extends into the notch, and a static contact rod 4 electrically connected to the remaining conductive rods is arranged in the main box body 1, and a plurality of insulating porcelain rings 6 are evenly arranged on the peripheral end of the static contact rod 4; a driving mechanism is arranged on the outer wall of the main box body 1, and the driving mechanism includes a hydraulic cylinder and a transmission shaft 2 driven by the hydraulic cylinder and coaxially connected to the moving contact rod 3 through a coupling 7. The driving mechanism adopts a hydraulic cylinder or a cylinder to drive the transmission shaft 2 to move, thereby driving the moving contact rod 3 to move, so that the moving contact rod 3 and the static contact rod 4 contact or disengage with each other, thereby controlling the on-off of the external circuit.

[0020] A sealing assembly 8 is provided at the contact point between the transmission shaft 2 and the main housing 1, and at the contact point between the moving contact rod 3 and the main housing 1. Figure 2As shown, taking the sealing assembly 8 at the contact point between the moving contact rod 3 and the main box body 1 as an example: the sealing assembly 8 includes a sealing seat 10 arranged at the end of the arc extinguishing box 9 and located between the arc extinguishing box 9 and the moving contact rod 3, a sleeve 11 arranged in the arc extinguishing box 9 and fitted with the sealing seat 10, and a fixed sleeve 12 arranged in the arc extinguishing box 9 and fitted with the sleeve 11, one end of the fixed sleeve 12 extends between the sleeve 11 and the moving contact rod 3 and a first sealing ring 15 sleeved on the moving contact rod 3 is arranged between the sleeve 11 and the sealing seat 10, a notch is arranged on one side of the sleeve 11 close to the sealing seat 10, the first sealing ring 15 is fitted with the wall surface of the notch, and the fixed sleeve 12 A guide rod 13 is provided on it, and the guide rod 13 includes a smooth section respectively matched with the sleeve 11 and the sealing seat 10 and a threaded section with a diameter smaller than the smooth section and capable of extending into the side wall of the sealing seat 10. The guide rod 13 passes through the sleeve 11 and the sealing seat 10 and is threadedly connected with a fixing nut. An annular groove which is matched with each other and coaxial with the guide rod 13 is provided at the contact point between the fixed sleeve 12 and the sleeve 11, and a second sealing ring 16 is provided in the annular groove. A sealing groove is provided on the side of the fixed sleeve 12 close to the moving contact rod 3, and a third sealing ring 17 is provided in the sealing groove. A fourth sealing ring 18 which is sleeved on the peripheral end of the guide rod 13 is provided at the contact point between the sealing seat 10 and the sleeve 11.

[0021] By arranging the first sealing ring 15 in the space enclosed by the sealing seat 10, the sleeve 11, the fixed sleeve 12 and the moving contact rod 3, not only can the first sealing ring 15 be fixed by the fixed sleeve 12, but the entire structure is also easy and quick to install, and the first sealing tube can seal the contact surfaces between the moving contact rod 3, the sealing seat 10, the sleeve 11 and the fixed sleeve 12. At the same time, the second sealing ring 16 is used to improve the sealing performance between the sleeve 11 and the fixed sleeve 12, the third sealing ring 17 is used to improve the sealing performance between the fixed sleeve 12 and the moving contact rod 3, and the fourth sealing ring 18 is used to improve the sealing performance between the sealing seat 10 and the sleeve 11, thereby effectively improving the sealing performance of the sulfur hexafluoride gas in the arc extinguishing box 9, and solving the problem that the traditional sulfur hexafluoride circuit breaker is prone to sulfur hexafluoride gas leakage at the contact point between its moving parts and stationary parts due to the single sealing structure.

[0022] The above description is only a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A high-voltage circuit breaker with a housing sealing function, comprising a main box, an arc extinguishing box arranged in the main box, and a static contact rod, a movable contact rod electrically connected to the static contact rod is slidably connected in the arc extinguishing box, a conductive rod electrically connected to the movable contact rod and the static contact rod respectively provided on the side wall of the main box, and a driving mechanism driving the movable contact rod to slide, characterized in that: It also includes a sealing assembly, which includes a sealing seat arranged at the end of the arc extinguishing box and located between the arc extinguishing box and the moving contact rod, a sleeve arranged in the arc extinguishing box and fitted with the sealing seat, and a fixed sleeve arranged in the arc extinguishing box and fitted with the sleeve, one end of the fixed sleeve extends between the sleeve and the moving contact rod and a first sealing ring arranged on the moving contact rod is provided between the sealing seat.

2. A high voltage circuit breaker with housing sealing function according to claim 1, characterized in that: The fixing sleeve is provided with a guide rod, which passes through the sleeve and the sealing seat and is threadedly connected with a fixing nut.

3. A high voltage circuit breaker with housing sealing function according to claim 2, characterized in that: The guide rod comprises a smooth section respectively matched with the sleeve and the sealing seat and a threaded section with a diameter smaller than that of the smooth section and capable of extending into the side wall of the sealing seat.

4. A high voltage circuit breaker with housing sealing function according to claim 2, characterized in that: An annular groove which is adapted to each other and coaxial with the guide rod is provided at the contact point between the fixing sleeve and the sleeve, and a second sealing ring is provided in the annular groove.

5. A high voltage circuit breaker with housing sealing function according to claim 1, characterized in that: A notch is provided on one side of the sleeve close to the sealing seat, and the first sealing ring is fitted with the wall surface of the notch.

6. A high voltage circuit breaker with housing sealing function according to claim 1, characterized in that: A sealing groove is provided on one side of the fixed sleeve close to the moving contact rod, and a third sealing ring is provided in the sealing groove.

7. A high voltage circuit breaker with housing sealing function according to claim 1, characterized in that: The driving mechanism comprises a hydraulic cylinder and a transmission shaft driven by the hydraulic cylinder and coaxially connected to the moving contact rod. The sealing assembly is also provided between the transmission shaft and the side wall of the arc extinguishing box.

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