Moving contact of high-voltage vacuum circuit breaker

Abstract

The utility model discloses a moving contact of a high-voltage vacuum circuit breaker, which comprises a moving contact, the head of the moving contact is provided with a support ring, and the end face of the support ring is uniformly provided with a plurality of contact pieces which are bent towards the direction far away from the axis of the support ring at equal intervals by taking a circle point as the axis. The contact piece is provided with an abutting part, the contact piece is provided with an inclined guide part and is arranged above the abutting part, the head part of the moving contact is provided with a concave cavity, and the concave cavity is provided with a plurality of inclined heat dissipation holes. According to the utility model, a multi-contact-piece layered contact mode is adopted, so that the moving contact is closed before the static contact, the stress is balanced, the conductive area is enlarged, and the local resistance and heat are reduced; the elastic contact piece enhances the occlusion tightness, and cooperates with the honeycomb-shaped heat dissipation holes in the moving contact to improve the air convection efficiency, and through the above design scheme, the product has the advantages of uniform stress, reduced local temperature rise, prolonged service life and the like.

Description

Technical Field

[0001] This utility model relates to the field of high-voltage switch technology, and in particular to a moving contact of a high-voltage vacuum circuit breaker. Background Technology

[0002] Vacuum circuit breakers are named for their high-vacuum arc-extinguishing medium and the high-vacuum insulation medium in the contact gap after arc extinguishing. They are characterized by their small size, light weight, suitability for frequent operation, and maintenance-free arc extinguishing, making them widely used in power distribution networks. Vacuum circuit breakers are indoor power distribution devices in 3-10kV, 50Hz three-phase AC systems, used in industrial and mining enterprises, power plants, and substations for the protection and control of electrical equipment. They are particularly suitable for applications requiring oil-free operation, minimal maintenance, and frequent operation. Circuit breakers can be installed in medium-voltage switchgear, double-layer switchgear, and fixed switchgear for the control and protection of high-voltage electrical equipment.

[0003] Common high-voltage vacuum circuit breakers include handcart-type vacuum circuit breakers, side-mounted vacuum circuit breakers, and fixed vacuum circuit breakers. Currently, the movement and stationary contacts of vacuum circuit breakers are mainly engaged by the contact fingers and springs of the clover contact, so that a single movement contact is engaged with a single stationary contact. This engagement method requires that the force on each contact point be uniform and that it has high conductivity. At the same time, the size of the movement and stationary contacts must be controlled within a reasonable range.

[0004] However, in practical applications, due to errors in the fit between the moving and stationary contacts, and significant vibrations during circuit breaker opening and closing, uneven force is applied between the moving and stationary contacts, reducing the contact area. This not only lowers the current carrying capacity but may also cause excessive local temperature rise, affecting the safe and stable operation of the equipment. Therefore, the applicant has developed a beneficial design and found a solution to the above problems. The technical solution described below arose under this background. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the moving contact design in traditional vacuum circuit breakers and to provide a product that provides uniform stress distribution, reduces local temperature rise, and extends service life.

[0006] To solve the above problems, the present invention adopts the following technical solution.

[0007] A moving contact of a high-voltage vacuum circuit breaker includes a moving contact with a support ring at its head. The end face of the support ring is provided with a plurality of equally spaced contact pieces that are bent away from the axis of the support ring, with a dot as the axis. Each contact piece has an abutment portion and an inclined guide portion disposed above the abutment portion. The head of the moving contact is provided with a cavity, and the cavity is provided with a plurality of inclined heat dissipation holes.

[0008] Preferably, the moving contact has a groove on the outer wall of its head, and the moving contact also has a first recessed groove for accommodating the support ring, and a second recessed groove for accommodating the compressed contact piece is provided at the entrance of the first recessed groove.

[0009] Preferably, it also includes a plum blossom contact, one end of which is engaged in a groove, so that the plum blossom contact is connected and fixed to the moving contact.

[0010] Preferably, the moving contact is provided with an operating rod, the operating rod is provided with a through threaded hole, one end of the threaded hole is provided with a first countersunk hole and is located at the bottom of the cavity, and the other end of the threaded hole is provided with a second countersunk hole.

[0011] Preferably, the heat dissipation holes are evenly distributed on the outer side of the first countersunk hole.

[0012] Preferably, the entrance of the concave cavity is provided with a third sinking groove in a stepped shape.

[0013] Preferably, both ends of the contact portion are provided with inclined clearance portions.

[0014] Beneficial effects:

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0016] This invention, by employing a structure with multiple contact pieces, ensures that multiple contact portions can make contact with the stationary contact before the stationary contact, thereby significantly increasing the number of contact points between the moving and stationary contacts. This design not only improves the uniformity of force distribution on the contacts but also greatly increases the contact area, effectively reducing localized heating. Furthermore, the contact pieces possess elastic properties, further enhancing the interlocking force between the moving and stationary contacts, ensuring the stability and reliability of the contact fit. To further improve heat dissipation efficiency, the moving contact is also equipped with multiple heat dissipation holes. These holes not only increase the contact area between the inner wall and the air but also promote the heat exchange process, effectively accelerating the heat dissipation speed and further preventing excessive localized temperature rise. Through the above comprehensive design, this invention achieves advantages such as uniform force distribution, reduced localized temperature rise, and extended service life, providing a strong guarantee for the stable operation of vacuum circuit breakers and overcoming the problems raised in the background art. Attached Figure Description

[0017] Figure 1 This is a side cross-sectional view of the moving contact of a high-voltage vacuum circuit breaker according to the present invention.

[0018] Figure 2 This utility model Figure 1 A partially enlarged view A of the moving contact of a high-voltage vacuum circuit breaker;

[0019] Figure 3This is a schematic diagram of the support ring structure of the moving contact of a high-voltage vacuum circuit breaker according to the present invention;

[0020] The correspondence between the labels and component names in the attached figures is as follows:

[0021] Reference numerals: 1. Moving contact; 2. Support ring; 3. Plexicon contact; 4. Operating lever; 11. Cavity; 12. Heat dissipation hole; 13. Groove; 14. First countersunk groove; 15. Third countersunk groove; 141. Second countersunk groove; 21. Contact piece; 22. Abutting part; 23. Guide part; 24. Relief part; 41. Threaded hole; 42. First countersunk hole; 43. Second countersunk hole. Detailed Implementation

[0022] The technical solution of this utility model will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0023] In the description of this utility model, it should be understood that the terms "upper", "lower", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0024] In this embodiment of the utility model, "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0025] Reference example Figures 1 to 3 A moving contact of a high-voltage vacuum circuit breaker includes a moving contact 1. The head of the moving contact 1 is provided with a support ring 2. The end face of the support ring 2 is provided with a plurality of equally spaced contact pieces 21 that are bent away from the axis of the support ring 2. The contact pieces 21 are provided with a contact portion 22 and an inclined guide portion 23, which is provided above the contact portion 22. The head of the moving contact 1 is provided with a cavity 11, and the cavity 11 is provided with a plurality of inclined heat dissipation holes 12.

[0026] By employing a structure with multiple contact pieces 21, it is ensured that multiple contact parts 22 can make contact before the stationary contact, thereby significantly increasing the number of contact points between the moving and stationary contacts. This design not only improves the uniformity of force on the contacts but also greatly increases the contact area, effectively reducing local heating. In addition, the contact pieces 21 have elastic properties, which further enhances the interlocking force between the moving contact 1 and the stationary contact, ensuring the stability and reliability of the contact engagement.

[0027] It is worth mentioning that the outer wall of the head of the moving contact 1 is provided with a groove 13, and the moving contact 1 is also provided with a first recess 14 for accommodating the support ring 2. The entrance of the first recess 14 is provided with a second recess 141 for accommodating the compressed contact piece 21. The support ring 2 is fixed to the inner wall and bottom of the first recess 14 by spot welding, ensuring that when the contact part 22 is squeezed by the stationary contact, it provides sufficient space for the contact piece 21 to be accommodated, and ensuring that the stationary contact smoothly and completely enters the moving contact 1.

[0028] It is worth mentioning that it also includes a plum blossom contact 3. One end of the plum blossom contact 3 is stuck in the groove 13, so that the plum blossom contact 3 is connected and fixed to the moving contact 1. The function of the plum blossom contact 3 is to provide a stable electrical connection between the moving contact 1 and the stationary contact.

[0029] It is worth mentioning that the moving contact 1 is equipped with an operating rod 4, which has a through threaded hole 41. One end of the threaded hole 41 has a first countersunk hole 42, which is located at the bottom of the cavity 11. The other end of the threaded hole 41 has a second countersunk hole 43. The threaded hole 41 is designed for fastener insertion, so as to achieve a firm connection between the operating rod 4 and the vacuum circuit breaker or insulator. The first and second countersunk holes 43 ensure that the head of the fastener does not protrude from the surface, maintaining an overall flat and aesthetically pleasing appearance.

[0030] It is worth mentioning that the heat dissipation holes 12 are evenly distributed on the outside of the first countersunk hole 42. In order to further improve the heat dissipation efficiency, the moving contact 1 is also provided with multiple heat dissipation holes 12. These heat dissipation holes 12 not only increase the contact area between the inner wall and the air, but also promote the heat exchange process, effectively accelerate the heat dissipation speed, and further prevent the problem of excessive local temperature rise.

[0031] It is worth mentioning that a stepped third recess 15 is provided at the entrance of the cavity 11, which serves to guide the stationary contact into the cavity 11.

[0032] It is worth mentioning that both ends of the contact portion 22 are provided with inclined relief portions 24. The relief portions 24 facilitate the further compression of the contact piece 21, so that the stationary contact gradually enters the moving contact 1.

[0033] Through the above comprehensive design, this utility model achieves advantages such as uniform stress distribution, reduced local temperature rise, and extended service life, providing a strong guarantee for the stable operation of vacuum circuit breakers.

[0034] The above description, in conjunction with specific embodiments, provides a further detailed explanation of the present utility model. It should not be construed that the specific implementation of the present utility model is limited to these descriptions. For those skilled in the art, several simple deductions or substitutions can be made without departing from the concept of the present utility model, and all such deductions or substitutions should be considered to fall within the scope of protection defined by the claims submitted by the present utility model.

Claims

1. A moving contact of a high-voltage vacuum circuit breaker comprising a moving contact (1), characterized in that: The head of the movable contact (1) is provided with a support ring (2), the end face of the support ring (2) is uniformly provided with a plurality of equal-interval contact pads (21) having a bending direction away from the axis of the support ring (2), the contact pad (21) is provided with a contact portion (22), the contact pad (21) is provided with an inclined guide portion (23) and is arranged above the contact portion (22), the head of the movable contact (1) is provided with a recess (11), and the recess (11) is provided with a plurality of inclined heat dissipation holes (12).

2. The moving contact of a high-voltage vacuum circuit breaker according to claim 1, characterized in that: The outer wall of the head of the movable contact (1) is provided with a groove (13), the movable contact (1) is further provided with a first sunken groove (14) accommodating the support ring (2), and the entrance of the first sunken groove (14) is provided with a second sunken groove (141) accommodating the compressed contact pad (21).

3. The moving contact of a high-voltage vacuum circuit breaker according to claim 2, characterized in that: A plum blossom contact (3) is further included, one end of the plum blossom contact (3) is clamped in the groove (13), so that the plum blossom contact (3) is connected and fixed with the movable contact (1).

4. The moving contact of a high voltage vacuum circuit breaker according to claim 1, characterized in that: The movable contact (1) is provided with an operating rod (4), the operating rod (4) is provided with a threaded hole (41) penetrating through, one end of the threaded hole (41) is provided with a first counterbore (42) and is arranged at the bottom of the recess (11), and the other end of the threaded hole (41) is provided with a second counterbore (43).

5. The moving contact of a high-voltage vacuum circuit breaker according to claim 4, characterized in that: The heat dissipation holes (12) are arranged on the outer side of the first counterbore (42) in equal distribution.

6. The moving contact of a high voltage vacuum circuit breaker according to claim 1, characterized in that: The entrance of the recess (11) is provided with a third sunken groove (15) in a stepped shape.

7. The moving contact of a high-voltage vacuum circuit breaker according to any one of claims 2 to 6, characterized in that: Both ends of the contact portion (22) are provided with inclined accommodation portions (24).

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