Vacuum arc-extinguishing chamber

Abstract

The utility model relates to a vacuum arc-extinguishing chamber, which comprises a shell, a vacuum cavity is arranged in the shell, the upper end of the shell is in interference fit with an upper cover, the lower end of the upper cover is fixedly connected with a fixed contact, the lower end of the shell is in interference fit with a lower cover, and the lower cover is fixedly connected with an isolation sleeve. A combined push rod is slidably connected in the isolation sleeve, one end, penetrating into the shell, of the combined push rod is fixedly connected with a movable contact, the outer sides of the movable contact and the fixed contact are sleeved with a protective cover, and a corrugated pipe is fixedly connected between the movable contacts; a lower sealing mechanism used for sealing the lower end of the corrugated pipe is arranged between the corrugated pipe and the lower cover in a matched mode, and an upper sealing mechanism used for sealing the upper end of the corrugated pipe is arranged between the corrugated pipe and the movable contact in a matched mode. According to the utility model, the sealing performance of the joints of the corrugated pipe, the movable contact and the lower cover can be ensured, thereby ensuring that the vacuum cavity is always in a vacuum state.

Description

Technical Field

[0001] The utility model relates to the field of power switches, in particular to a vacuum interrupter. 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.

[0003] The vacuum interrupter includes a moving contact and a stationary contact. The lower end of the moving contact is fixedly connected to a bellows. The moving contact disconnects from the stationary contact through the expansion and contraction of the bellows, thereby realizing the opening and closing of the switch. Since the bellows needs to move and deform, it is necessary to ensure the sealing of the connection between the bellows and the lower cover and the moving contact to avoid the vacuum environment in the interrupter being destroyed. Utility Model Content

[0004] The utility model provides a vacuum arc extinguishing chamber, which solves the above problems existing in the use process of the prior art.

[0005] The technical solution of the utility model is achieved as follows: a vacuum arc extinguishing chamber, comprising an outer shell, a vacuum cavity is opened in the outer shell, an upper cover is interference fit at the upper end of the outer shell, a fixed contact is fixedly connected to the lower end of the upper cover, a lower cover is interference fit at the lower end of the outer shell, an insulating sleeve is fixedly connected to the lower cover, a combined push rod is slidably connected in the insulating sleeve, one end of the combined push rod extends through the outer shell and is fixedly connected to a moving contact, a protective cover is provided on the outer sides of the moving contact and the fixed contact, a bellows is fixedly connected between the moving contacts, a lower sealing mechanism for sealing the lower end of the bellows is cooperated between the bellows and the lower cover, and an upper sealing mechanism for sealing the upper end of the bellows is cooperated between the bellows and the moving contact.

[0006] The utility model is further configured as follows: a mounting groove is provided on the upper end surface of the lower cover, and the outer side of the isolation sleeve is abutted against the inner wall of the mounting groove.

[0007] The utility model is further configured as follows: the combined push rod includes an insulating tube, a conductive rod and a limiting tube, the conductive rod is fixedly connected to the lower end surface of the moving contact, the insulating tube is fixedly connected to the outer side wall of the conductive rod, and the limiting tube is integrally formed on the outer side wall of the insulating tube and abuts against the lower end surface of the lower cover.

[0008] The utility model is further configured as follows: an arc segment is fixedly connected to the isolation tube, the inner wall of the isolation sleeve is a flexible sealing pad, and the protruding apex of the arc segment abuts against the flexible sealing pad.

[0009] The utility model is further configured as follows: the lower sealing mechanism includes an embedding groove and a first sealing ring, the embedding groove is opened at the upper end of the lower cover, the lower end of the bellows is clamped in the embedding groove, the lower cover is integrally formed with a supporting platform at the upper end of the embedding groove, the bellows is fixedly connected with a supporting ring, the supporting ring abuts against the supporting platform, and the first sealing ring is interference fit in the gap between the supporting ring and the supporting platform.

[0010] The utility model is further configured as follows: the upper sealing mechanism includes an upper conical groove and an upper sealing cone ring, the upper conical groove is opened at the lower end of the moving contact, the upper sealing cone ring is fixedly connected to the upper end of the bellows, the upper sealing cone ring is interference fit in the upper conical groove, and the bellows is provided with a second sealing ring at the lower end of the upper sealing cone ring.

[0011] The utility model is further configured as follows: a lower conical groove is opened at the lower end of the inner wall of the bellows, a corresponding lower sealing cone ring is fixedly connected to the upper end of the insulating sleeve, and the lower sealing cone ring is inserted in the lower conical groove.

[0012] In summary, the beneficial effects of the utility model are:

[0013] The inner wall of the isolation sleeve in the utility model is made of flexible sealing material. When the isolation tube in the combined push rod slides up and down in the isolation sleeve, the arc section on the isolation tube will support a cavity on the inner wall of the isolation sleeve. The cavity moves with the movement of the isolation tube, thereby achieving a dynamic sealing effect, ensuring that when the vacuum interrupter is opening and closing the circuit, air and dust will not enter the vacuum chamber from the bellows and destroy the vacuum state of the vacuum interrupter. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0015] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0016] Figure 2 It is a schematic diagram of the cross-sectional structure of the utility model;

[0017] Figure 3 for Figure 2 A partial enlarged schematic diagram in the middle;

[0018] Figure 4 for Figure 2 A partial enlarged schematic diagram of point B in the middle;

[0019] Figure 5 for Figure 2 A partial enlarged schematic diagram of point C in the middle;

[0020] Figure 6 It is a structural schematic diagram of the lower cover in the utility model;

[0021] Figure 7 It is a structural schematic diagram of the insulating sleeve in the utility model;

[0022] Figure 8 It is a structural schematic diagram of the movable contact in the utility model;

[0023] Fig. 9 It is a schematic diagram of the structure of the bellows in the utility model.

[0024] Numbers in the figure: 1 shell, 11 vacuum chamber, 2 upper cover, 3 fixed contact, 4 lower cover, 41 mounting groove, 42 embedding groove, 43 supporting platform, 44 first sealing ring, 5 insulating sleeve, 51 flexible sealing pad, 52 lower sealing cone ring, 6 combined push rod, 61 insulating tube, 62 conductive rod, 63 limiting tube, 64 arc segment, 7 moving contact, 71 upper conical groove, 8 protective cover, 9 bellows, 91 supporting ring, 92 upper sealing cone ring, 93 second sealing ring, 94 lower conical groove. DETAILED DESCRIPTION

[0025] The following will be combined with the attached embodiment of the present utility model Figure 1-9 , clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] Example:

[0027] like Figures 1 to 9As shown, the utility model discloses a vacuum interrupter, comprising a shell 1, a vacuum chamber 11 is provided in the shell 1, an upper cover 2 is interference fit at the upper end of the shell 1, and a fixed contact 3 is fixedly connected to the lower end of the upper cover 2. Further, a lower cover 4 is interference fit at the lower end of the shell 1, an insulating sleeve 5 is fixedly connected to the lower cover 4, a combined push rod 6 is slidably connected in the insulating sleeve 5, and a moving contact 7 is fixedly connected to one end of the combined push rod 6 extending through the shell 1, and a protective cover 8 is provided on the outer side of the moving contact 7 and the fixed contact 3. In addition, a bellows 9 is fixedly connected between the moving contacts 7, a lower sealing mechanism for sealing the lower end of the bellows 9 is provided between the bellows 9 and the lower cover 4, and an upper sealing mechanism for sealing the upper end of the bellows 9 is provided between the bellows 9 and the moving contact 7.

[0028] Among them, a mounting groove 41 is provided on the upper end surface of the lower cover 4, and the outer side of the isolating sleeve 5 abuts against the inner wall of the mounting groove 41. Further, the combined push rod 6 includes an isolating tube 61, a conductive rod 62 and a limiting tube 63, the conductive rod 62 is fixedly connected to the lower end surface of the moving contact 7, the isolating tube 61 is fixedly connected to the outer side wall of the conductive rod 62, and an arc segment 64 is fixedly connected to the isolating tube 61, the inner wall of the isolating sleeve 5 is a flexible sealing pad 51, the protruding vertex of the arc segment 64 abuts against the flexible sealing pad 51, and the limiting tube 63 is integrally formed on the outer side wall of the isolating tube 61 and abuts against the lower end surface of the lower cover 4.

[0029] In the utility model, the isolation tube 61 is made of insulating material, and the conductive rod 62 is wrapped in the isolation tube 61. When the isolation tube 61 slides up and down in the isolation sleeve 5, the arc segment 64 will support a dynamic cavity on the flexible sealing pad 51. The position of the dynamic cavity changes with the movement of the isolation tube 61, and due to the pressure, both ends of the dynamic cavity will fit tightly on the isolation tube 61, thereby playing a dynamic sealing role.

[0030] Furthermore, the lower sealing mechanism includes an embedding groove 42 and a first sealing ring 44. The embedding groove 42 is provided at the upper end of the lower cover 4. The lower end of the bellows 9 is clamped in the embedding groove 42. The lower cover 4 is integrally formed with a support platform 43 at the upper end of the embedding groove 42. A support ring 91 is fixedly connected to the bellows 9. The support ring 91 abuts against the support platform 43. The first sealing ring 44 is interference-fitted in the gap between the support ring 91 and the support platform 43. Through the above structure, the connection between the bellows 9 and the lower cover 4 can be strengthened, and the lower end of the bellows 9 can be fixed. The first sealing ring 44 prevents the bellows 9 from being embedded in the groove 42 and also ensures the sealing of the connection between the bellows 9 and the lower cover 4.

[0031] Furthermore, the upper sealing mechanism includes an upper conical groove 71 and an upper sealing cone ring 92. The upper conical groove 71 is opened at the lower end of the moving contact 7, and the upper sealing cone ring 92 is fixedly connected to the upper end of the bellows 9. The upper sealing cone ring 92 is interference-fitted in the upper conical groove 71, and the bellows 9 is sleeved with a second sealing ring 93 at the lower end of the upper sealing cone ring 92. The above structure ensures the sealing of the upper end of the bellows 9.

[0032] In addition, a lower conical groove 94 is formed at the lower end of the inner wall of the bellows 9, and a corresponding lower sealing cone ring 52 is fixedly connected to the upper end of the insulating sleeve 5, and the lower sealing cone ring 52 is inserted into the lower conical groove 94. The above structure can further fix the bellows 9, prevent the connection between the bellows 9 and the lower cover 4 from loosening during long-term use, causing the position of the bellows 9 to move, etc.

[0033] It should also be pointed out that the terms used in the present invention, such as "front", "rear", "vertical", "horizontal", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings and are only used to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention.

[0034] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A vacuum interrupter, comprising a housing (1), wherein a vacuum cavity (11) is provided in the housing (1), characterized in that: The upper end of the housing (1) is interference-fitted with an upper cover (2), the lower end of the upper cover (2) is fixedly connected with a fixed contact (3), the lower end of the housing (1) is interference-fitted with a lower cover (4), the lower cover (4) is fixedly connected with an insulating sleeve (5), a combined push rod (6) is slidably connected inside the insulating sleeve (5), one end of the combined push rod (6) extending through the housing (1) is fixedly connected with a moving contact (7), the outer sleeves of the moving contact (7) and the fixed contact (3) are provided with a protective cover (8), a bellows (9) is fixedly connected between the moving contact (7), a lower sealing mechanism for sealing the lower end of the bellows (9) is provided between the bellows (9) and the lower cover (4), and an upper sealing mechanism for sealing the upper end of the bellows (9) is provided between the bellows (9) and the moving contact (7); The upper end surface of the lower cover (4) is provided with a mounting groove (41), and the outer side of the isolation sleeve (5) is supported on the inner wall of the mounting groove (41); The combined push rod (6) comprises an isolation tube (61), a conductive rod (62) and a position limiting tube (63); the conductive rod (62) is fixedly connected to the lower end surface of the moving contact (7); the isolation tube (61) is fixedly connected to the outer side wall of the conductive rod (62); and the position limiting tube (63) is integrally formed on the outer side wall of the isolation tube (61) and abuts against the lower end surface of the lower cover (4); An arc segment (64) is fixedly connected to the isolation tube (61), the inner wall of the isolation sleeve (5) is a flexible sealing pad (51), and the protruding apex of the arc segment (64) abuts against the flexible sealing pad (51).

2. A vacuum interrupter according to claim 1, characterized in that: The lower sealing mechanism comprises an embedding groove (42) and a first sealing ring (44); the embedding groove (42) is formed at the upper end of the lower cover (4); the lower end of the bellows (9) is clamped in the embedding groove (42); the lower cover (4) is integrally formed with a supporting platform (43) at the upper end of the embedding groove (42); a supporting ring (91) is fixedly connected to the bellows (9); the supporting ring (91) abuts against the supporting platform (43); and the first sealing ring (44) is interference-fitted in a gap between the supporting ring (91) and the supporting platform (43).

3. A vacuum interrupter according to claim 1, characterized in that: The upper sealing mechanism comprises an upper conical groove (71) and an upper sealing cone ring (92); the upper conical groove (71) is formed at the lower end of the moving contact (7); the upper sealing cone ring (92) is interference-fitted with the upper end of the bellows (9); the upper sealing cone ring (92) is inserted into the upper conical groove (71); and the bellows (9) is provided with a second sealing ring (93) at the lower end of the upper sealing cone ring (92).

4. A vacuum interrupter according to claim 1, characterized in that: A lower conical groove (94) is formed at the lower end of the inner wall of the bellows (9), and a corresponding lower sealing cone ring (52) is fixedly connected to the upper end of the insulating sleeve (5), and the lower sealing cone ring (52) is inserted into the lower conical groove (94).

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