Instantaneous arc extinguishing type high-voltage vacuum arc extinguishing chamber

Abstract

The utility model relates to the technical field of arc extinguish chambers, in particular to an instantaneous arc extinguish type high-voltage vacuum arc extinguish chamber, which comprises a ceramic shell, a static contact is arranged in the ceramic shell, and a static conducting rod is arranged at the other end of the static contact. According to the utility model, the static contact, the static conducting rod, the static cover plate and the static end conducting block are combined to weigh the electrode; when the vacuum circuit breaker, the vacuum load switch and the vacuum contactor which are assembled by the vacuum arc extinguish chamber are closed, the operating mechanism enables the two contacts to be closed through the movement of the movable conducting rod, and the connection of a circuit is completed. In order to enable the contact resistance between the two contacts to be as small as possible and to be kept stable, the arc extinguish chamber has good mechanical strength when bearing dynamic stable current, the static contact in the ceramic shell and the dynamic contact arranged at one end of the static contact are separated, electric arc is generated between the static contact and the dynamic contact, the electric arc is extinguished until the current naturally crosses zero, and circuit breaking is completed. And the instantaneous extinguishing of the electric arc is effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of vacuum interrupter chambers, in particular to an instantaneous arc-extinguishing type high-voltage vacuum interrupter chamber. Background Art

[0002] The vacuum interrupter, also known as the vacuum switch tube, is the core component of medium and high voltage power switches. Its main function is to quickly extinguish the arc and suppress the current after the medium and high voltage circuit is cut off from the power supply through the excellent insulation of the vacuum inside the tube, so as to avoid accidents and unexpected events. It is mainly used in power transmission and distribution control systems, as well as in power distribution systems such as metallurgy, mining, petroleum, chemical industry, railways, broadcasting, communications, and industrial high-frequency heating. It has the characteristics of energy saving, material saving, fire prevention, explosion prevention, small size, long life, low maintenance cost, reliable operation and no pollution. The vacuum interrupter is divided into the interrupter for circuit breakers and the interrupter for load switches according to its use. The interrupter for circuit breakers is mainly used in substations and power grid facilities in the power sector, and the interrupter for load switches is mainly used by end users of the power grid.

[0003] After searching, a vacuum arc extinguishing chamber for a high-voltage cabinet with a publication number of CN209461372U is disclosed, which specifically discloses a vacuum arc extinguishing chamber for a high-voltage cabinet, including a vacuum arc extinguishing chamber main body, a moving end sealing plate is arranged on the upper outer surface of the vacuum arc extinguishing chamber main body, a moving conductive rod is penetrated through the middle of the upper end of the moving end sealing plate, a bearing hole is arranged on the upper outer surface of the moving conductive rod, and an extended conductive rod is arranged on the inner side of the bearing hole. Because the vacuum arc extinguishing chamber for the high-voltage cabinet is provided with a protective rubber sleeve, when the vacuum arc extinguishing chamber accidentally falls to the ground, the protective rubber sleeve can be used to isolate the vacuum arc extinguishing chamber main body and the ground to avoid direct contact and damage, and at the same time, the elastic cotton tube can be used to offset the impact force generated when falling to the ground, so as to further avoid damage to the vacuum arc extinguishing chamber main body, thereby achieving its effect on the vacuum extinguishing chamber. The arc chamber has the benefit of protecting it, and the protective rubber sleeve and the elastic cotton tube are made of insulating materials, so the vacuum arc chamber body can be isolated from the outside world by the protective rubber sleeve and the elastic cotton tube, thereby achieving the benefit of improving the insulation performance of the vacuum arc chamber body. Because an extended conductive rod is provided, the extended conductive rod can be pulled out from the bearing hole on the movable conductive rod as needed. When the adjusting hole on the extended conductive rod and the limiting hole on the movable conductive rod are aligned, the limiting pin is inserted into the adjusting hole and the inside of the limiting hole, and then the fixing iron wire is inserted into the limiting pin and bent, so that the limiting pin can be fixed in the adjusting hole and the limiting hole, and the extended conductive rod to be pulled out is fixed on the movable conductive rod to achieve the purpose of adjusting the length of the movable conductive rod, thereby achieving the benefit of facilitating the adjustment of the length of the movable conductive rod, and the effect of use is better than that of the traditional method.

[0004] The vacuum arc extinguishing chamber proposed in the above patent cannot quickly extinguish the arc. During the arc extinguishing operation, the air tightness of the arc extinguishing chamber needs to be improved through the cooperation of the movable end cover plate, the fixed end cover plate, and the stainless steel bellows. However, the comparative example does not propose how to extinguish the arc through the cooperation of the bellows, etc.

[0005] Therefore, it is necessary to invent an instantaneous arc extinguishing high-voltage vacuum interrupter to solve the above problems. Utility Model Content

[0006] The utility model aims to provide an instantaneous arc extinguishing type high voltage vacuum interrupter to solve the problems raised in the above background technology.

[0007] In order to achieve the above-mentioned purpose, the utility model provides the following technical solutions: an instantaneous arc-extinguishing high-voltage vacuum arc-extinguishing chamber, comprising a ceramic shell, a static contact is arranged inside the ceramic shell, a static conductive rod is arranged at the other end of the static contact, the other end of the static conductive rod is connected to a static cover plate, and a static end conductive block is installed at one end of the outer wall of the static cover plate.

[0008] Preferably, a movable conductive rod is provided at one end of the outer wall of the ceramic shell, the outer wall of the movable conductive rod is movably connected with a protective sleeve, the outer wall of the protective sleeve is connected with a side sleeve, and the inner wall surface of the side sleeve is provided with a threaded groove.

[0009] Preferably, the side cover is movably connected to the protective cover, and the center line of the side cover coincides with the center line of the protective cover.

[0010] Preferably, one end of the outer wall of the ceramic shell is connected to a guide sleeve, the inner wall of the guide sleeve is connected to a bellows, and the other end of the bellows is connected to a shielding cover.

[0011] Preferably, the outer wall of the shielding cover is connected with a shielding cylinder, a damping reset rod is arranged inside the shielding cylinder, and the other end of the damping reset rod is sleeved with an insulating sleeve.

[0012] Preferably, two groups of the damping reset rods are provided, the two groups of the damping reset rods are symmetrically distributed on the inner wall of the shielding cylinder, and the two groups of the damping reset rods are symmetrically arranged about the central axis of the shielding cylinder.

[0013] In the above technical solution, the technical effects and advantages provided by the utility model are:

[0014] 1. Through the arrangement of static contacts, static conductive rods, static cover plates and static end conductive blocks, the static contacts, static conductive rods, static cover plates and static end conductive blocks are collectively referred to as fixed electrodes; the moving contacts and moving conductive rods are collectively referred to as moving electrodes. When the vacuum circuit breaker, vacuum load switch and vacuum contactor assembled by the vacuum arc extinguishing chamber are closed, the operating mechanism closes the two contacts through the movement of the moving conductive rod, completing the connection of the circuit. In order to make the contact resistance between the two contacts as small as possible and keep it stable, and to ensure that the arc extinguishing chamber has good mechanical strength when it withstands dynamic stable current, the vacuum switch is provided with a guide sleeve at one end of the moving conductive rod to maintain a rated pressure between the two contacts. Therefore, when the vacuum switch arranged inside the ceramic shell breaks the current, the static contact in the ceramic shell and the dynamic contact arranged at one end of the static contact are separated and an arc is generated between them, until the arc is extinguished when the current naturally passes through zero, thus completing the circuit breaking and effectively improving the instantaneous extinction of the arc.

[0015] 2. Through the setting of the shielding cover and the shielding tube, the shielding cover and the shielding tube form a shielding system, so that the shielding system can prevent the contacts from generating a large amount of metal vapor and liquid droplets splashing during the arcing process, polluting the inner wall of the insulating shell, causing the insulation strength to decrease or flashover to occur. It can also improve the electric field distribution inside the vacuum interrupter, which is beneficial to the miniaturization of the insulating shell of the vacuum interrupter, especially for the miniaturization of high-voltage vacuum interrupters. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0017] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0018] Figure 2 This is a schematic diagram of the structure of the ceramic housing of the utility model;

[0019] Figure 3 This is a schematic diagram of the structure of the shielding tube of the utility model;

[0020] Figure 4 It is a schematic diagram of the structure inside the ceramic shell of the utility model.

[0021] Description of reference numerals:

[0022] 1. Ceramic shell; 2. Dynamic conductive rod; 3. Protective sleeve; 4. Side sleeve; 5. Threaded groove; 6. Guide sleeve; 7. Bellows; 8. Shielding cover; 9. Shielding tube; 10. Damping reset rod; 11. Insulating sleeve; 12. Static contact; 13. Static conductive rod; 14. Static cover plate; 15. Static end conductive block. DETAILED DESCRIPTION

[0023] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0024] The utility model provides Figure 1 , Figure 2 and Figure 4 An instantaneous arc-extinguishing high-voltage vacuum interrupter is shown, comprising a ceramic shell 1, a static contact 12 is arranged inside the ceramic shell 1, a static conductive rod 13 is arranged at the other end of the static contact 12, a static conductive rod 13 is connected to the other end of the static conductive rod 13, and a static cover plate 14 is connected to one end of the outer wall of the static cover plate 14. A static end conductive block 15 is installed.

[0025] like Figure 1-2 As shown, a moving conductive rod 2 is provided at one end of the outer wall of the ceramic shell 1, and a protective sleeve 3 is movably connected to the outer wall of the moving conductive rod 2, and a side sleeve 4 is connected to the outer wall of the protective sleeve 3, and the side sleeve 4 and the protective sleeve 3 are movably connected. The center line of the side sleeve 4 coincides with the center line of the protective sleeve 3. The arrangement of the side sleeve 4 and the protective sleeve 3 can play a protective role for the moving conductive rod 2 when docking, and a threaded groove 5 is provided on the inner wall surface of the side sleeve 4. The moving conductive rod 2 assists the conductive system inside the ceramic shell 1 to improve the arc extinguishing efficiency of the arc extinguishing chamber.

[0026] like Figure 1 , Figure 2 and Figure 4 As shown, one end of the outer wall of the ceramic shell 1 is connected to a guide sleeve 6, the inner wall of the guide sleeve 6 is connected to a bellows 7, and the other end of the bellows 7 is connected to a shielding cover 8. The bellows 7 can not only isolate the vacuum state inside the ceramic shell 1 from the external atmospheric state, but also enable the moving contact inside the ceramic shell 1 together with the moving conductive rod 2 to move within a specified range to complete the connection and disconnection operations of the vacuum switch.

[0027] like Figure 1 , Figure 3 and Figure 4As shown in the figure, the outer wall of the shielding cover 8 is connected to the shielding tube 9, and the inside of the shielding tube 9 is provided with a damping reset rod 10. There are two groups of damping reset rods 10, and the two groups of damping reset rods 10 are symmetrically distributed on the inner wall of the shielding tube 9. The two groups of damping reset rods 10 are symmetrically arranged about the central axis of the shielding tube 9. The arrangement of the damping reset rod 10 facilitates the docking installation between the shielding tube 9 and the shielding cover 8. The other end of the damping reset rod 10 is provided with an insulating sleeve 11. The arrangement of the insulating sleeve 11 can play a role of insulation protection between the damping reset rod 10 and the shielding cover 8.

[0028] The practical working principle of the present invention is as follows: first, when the high-voltage vacuum arc extinguishing chamber is used, the air in the arc extinguishing chamber is extracted to reduce the indoor pressure to a lower pressure, so that the arc is formed slowly in the vacuum arc extinguishing chamber under a high vacuum environment. When the circuit needs to be disconnected, the connection between the moving conductive rod 2 connected to one end of the ceramic shell 1 and the wire is controlled to quickly separate the static contact 12 inside the ceramic shell 1 and the dynamic contact control electrode system to disconnect the circuit. In order to make the contact resistance between the two contacts as small as possible and keep it stable, and the arc extinguishing chamber has good mechanical strength when subjected to dynamic stable current, the vacuum switch is provided with a guide sleeve 6 at one end of the moving conductive rod 2, and a group of compression springs are used to maintain a rated pressure between the two contacts. When the vacuum switch disconnects the current, the two contacts of the arc extinguishing chamber separate and generate an arc between them until the arc is extinguished when the current naturally passes through zero, thereby completing the circuit disconnection.

[0029] The above only describes some exemplary embodiments of the present invention by way of illustration. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. An instantaneous arc extinguishing high-voltage vacuum interrupter, comprising a ceramic housing (1), characterized in that: A static contact (12) is arranged inside the ceramic housing (1), a static conductive rod (13) is arranged at the other end of the static contact (12), the other end of the static conductive rod (13) is connected to a static cover plate (14), and a static end conductive block (15) is installed at one end of the outer wall of the static cover plate (14).

2. The instantaneous arc-extinguishing high-voltage vacuum interrupter according to claim 1, characterized in that: A movable conductive rod (2) is provided at one end of the outer wall of the ceramic housing (1); a protective sleeve (3) is movably connected to the outer wall of the movable conductive rod (2); a side sleeve (4) is connected to the outer wall of the protective sleeve (3); and a threaded groove (5) is provided on the inner wall surface of the side sleeve (4).

3. The instantaneous arc-extinguishing high-voltage vacuum interrupter according to claim 2, characterized in that: The side cover (4) is movably connected to the protective cover (3), and the center line of the side cover (4) coincides with the center line of the protective cover (3).

4. The instantaneous arc extinguishing high-voltage vacuum interrupter according to claim 1, characterized in that: One end of the outer wall of the ceramic housing (1) is connected to a guide sleeve (6), the inner wall of the guide sleeve (6) is connected to a bellows (7), and the other end of the bellows (7) is connected to a shielding cover (8).

5. The instantaneous arc extinguishing high voltage vacuum interrupter according to claim 4, characterized in that: The outer wall of the shielding cover (8) is connected to a shielding cylinder (9), a damping reset rod (10) is arranged inside the shielding cylinder (9), and the other end of the damping reset rod (10) is sleeved with an insulating sleeve (11).

6. The instantaneous arc extinguishing high-voltage vacuum interrupter according to claim 5, characterized in that: Two groups of the damping reset rods (10) are provided, and the two groups of the damping reset rods (10) are symmetrically distributed on the inner wall of the shielding cylinder (9), and the two groups of the damping reset rods (10) are symmetrically arranged about the central axis of the shielding cylinder (9).

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