Indoor high-voltage vacuum circuit breaker

Abstract

The utility model discloses an indoor high-voltage vacuum circuit breaker, which comprises a chassis truck, a circuit breaker main body arranged at the top of the chassis truck, a solid-sealed polar pole arranged on the circuit breaker main body, a contact arm arranged on the solid-sealed polar pole, and a tulip contact arranged at one end of the contact arm, according to the utility model, through the arrangement of the radiating fins, the heat dissipation capability of the contact pieces is improved, and the electrical performance and the service life of the switch are prevented from being influenced by over-high temperature of the contact pieces and the annular springs caused by heat accumulation; and the contact area with the contact arm can be increased through the arranged first contact part, and the contact area with the static contact can be increased through the arranged second contact part, so that the contact resistance can be reduced, heat generated by overlarge resistance can be reduced, and the temperature of the contact piece and the annular spring is further prevented from being overhigh.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit breakers, in particular to an indoor high-voltage vacuum circuit breaker. Background Art

[0002] The vacuum circuit breaker is named because its arc extinguishing medium and the insulating medium of the contact gap after arc extinguishing are both high vacuum. It has the advantages of small size, light weight, suitable for frequent operation, and no need for maintenance after arc extinguishing. There are many types of vacuum circuit breakers, and indoor high-voltage vacuum circuit breaker is one of them. It is mainly used in high-voltage cabinets. Its structure mainly consists of chassis, vacuum interrupter, operating mechanism and contacts.

[0003] Existing indoor high-voltage vacuum circuit breakers typically use plum blossom contacts for their contacts. However, the plum blossom contacts have limited heat dissipation capacity. Under excessive load, the heat generated increases, which can easily lead to overheating, resulting in a decrease in electrical performance. In severe cases, the plum blossom contacts may even be burned directly. High temperatures can also cause the springs on the plum blossom contacts to anneal, reducing their elasticity, leading to poor contact and shortening their service life. Utility Model Content

[0004] The purpose of the present utility model is to provide an indoor high-voltage vacuum circuit breaker to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solution: an indoor high-voltage vacuum circuit breaker, comprising a chassis, a circuit breaker body mounted on the top of the chassis, a sealed pole disposed on the circuit breaker body, a contact arm disposed on the sealed pole, and a plum blossom contact mounted on one end of the contact arm, the plum blossom contact comprising two annular plates, a plurality of contact pieces equidistantly distributed in an annular pattern being provided on the outer sides of the two annular plates, a plurality of heat sinks being integrally formed on one side of the contact piece, a second contact portion and a first contact portion being respectively provided on the other side of the contact piece, and an annular spring being mounted on the outer side of the contact piece.

[0006] As a preferred solution of the present invention, grooves are uniformly formed on the outer ring wall of the annular sheet along the circumferential direction, and a clamping groove matching the groove is formed on the contact sheet.

[0007] As a preferred solution of the present invention, a limiting groove is provided on the outer side of the contact piece, and the annular spring is installed in the limiting groove.

[0008] As a preferred solution of the present invention, an annular groove is provided on the outer side of the contact arm.

[0009] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention increases the heat dissipation capacity of the contact piece by providing a heat sink, thereby avoiding heat accumulation, which causes the temperature of the contact piece and the annular spring to be too high, affecting their electrical performance and service life; and the first contact portion provided can increase the contact area with the contact arm, and the second contact portion can increase the contact area with the static contact to reduce the contact resistance, thereby reducing the heat generated by excessive resistance, and further preventing the temperature of the contact piece and the annular spring from being too high. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic diagram of the three-dimensional structure of the utility model;

[0011] Figure 2 For this utility model Figure 1 Enlarged view of point A in the middle;

[0012] Figure 3 This is a schematic diagram of the structure of the utility model when the plum blossom contact is not installed;

[0013] Figure 4 For this utility model Figure 3 Enlarged view of point B in the middle;

[0014] Figure 5 This is a schematic diagram of the structure of the plum blossom contact of the utility model;

[0015] Figure 6 This is a schematic diagram of the structure of the contact piece of the utility model;

[0016] Figure 7 It is a structural schematic diagram of the annular sheet of the utility model.

[0017] In the figure: 1. Chassis; 2. Circuit breaker body; 3. Enclosed pole; 4. Contact arm;

[0018] 5. Plum blossom contact; 51. Ring piece; 52. Contact piece; 53. Heat sink; 54. Ring spring; 55. First contact portion; 56. Second contact portion;

[0019] 6. Annular groove; 7. Limiting groove; 8. Clamping groove; 9. Groove. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0021] See also Figures 1 to 7The utility model provides a technical solution: an indoor high-voltage vacuum circuit breaker, comprising a chassis 1, a circuit breaker body 2 mounted on the top of the chassis 1, a sealed pole 3 arranged on the circuit breaker body 2, a contact arm 4 arranged on the sealed pole 3, and a plum blossom contact 5 mounted on one end of the contact arm 4, the plum blossom contact 5 comprising two annular pieces 51, a plurality of contact pieces 52 distributed in an annular shape and equidistantly arranged on the outer side of the two annular pieces 51, a plurality of heat sinks 53 integrally formed on one side of the contact piece 52, the heat sink 53 increases the heat dissipation area of ​​the contact piece 52, so that the heat on the contact piece 52 can be quickly dissipated, avoiding heat accumulation, resulting in excessive temperature of the contact piece 52 and the annular spring 54, affecting their electrical performance and service life, and the contact piece 52 A second contact portion 56 and a first contact portion 55 are provided on the other side. The first contact portion 55 is used to contact the contact arm 4. The first contact portion 55 can increase the contact area with the contact arm 4, and the second contact portion 56 can increase the contact area with the static contact to reduce the contact resistance, thereby reducing the heat generated by excessive resistance. Moreover, since the first contact portion 55 increases the contact area with the contact arm 4, the installation of the plum blossom contact 5 is more stable and less likely to deflect. The second contact portion 56 is used for static contact contact. An annular spring 54 is installed on the outside of the contact piece 52. The annular spring 54 is used to apply pressure to the contact piece 52 so that the contact piece 52 can clamp the contact arm 4 and ensure that the contact piece 52 maintains good contact with the static contact.

[0022] Among them, grooves 9 are evenly opened on the outer ring wall of the annular piece 51 along the circumferential direction, and a card groove 8 that matches the groove 9 is opened on the contact piece 52. When the contact piece 52 is installed to the outer side of the annular piece 51, the card groove 8 will be stuck in the groove 9, which will restrict the contact piece 52, so that the contact piece 52 can only move along the direction of the card groove 8 and the groove 9, thereby preventing the contact piece 52 from deflecting.

[0023] A limiting groove 7 is provided on the outer side of the contact piece 52 . The limiting groove 7 is used to limit the annular spring 54 to prevent the annular spring 54 from deflecting. The annular spring 54 is installed in the limiting groove 7 .

[0024] The outer side of the contact arm 4 is provided with an annular groove 6 . When the plum blossom contact 5 is mounted on the contact arm 4 , the first contact portion 55 is locked in the annular groove 6 , so that the plum blossom contact 5 is not easily moved with the contact arm 4 .

[0025] Specifically, when installing the plum blossom contact 5, the first contact portion 55 is snapped into the annular groove 6 to achieve the connection between the plum blossom contact 5 and the contact arm 4. When the circuit breaker needs to be closed, the chassis 1 will move the plum blossom contact 5, and the second contact portion 56 will contact the static contact, forming a closed state of the circuit. The heat on the contact piece 52 is quickly dissipated through the heat sink 53, avoiding the contact piece 52 and the annular spring 54 from overheating.

[0026] In the description of the present invention, it should be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inside", "front", "center", "two ends", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0027] In addition, the terms "first", "second", "third" and "fourth" are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second", "third" and "fourth" may explicitly or implicitly include at least one such feature.

[0028] In the present invention, unless otherwise clearly stipulated and limited, the terms "install", "set", "connect", "fix", "screw" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in the present invention according to the specific circumstances.

[0029] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An indoor high-voltage vacuum circuit breaker, comprising a chassis (1), a circuit breaker body (2) mounted on the top of the chassis (1), a sealed pole (3) disposed on the circuit breaker body (2), a contact arm (4) disposed on the sealed pole (3), and a plum blossom contact (5) mounted on one end of the contact arm (4), characterized in that: The plum blossom contact (5) comprises two annular sheets (51), a plurality of contact sheets (52) equidistantly distributed in an annular shape are provided on the outside of the two annular sheets (51), a plurality of heat sinks (53) are integrally formed on one side of the contact sheet (52), a second contact portion (56) and a first contact portion (55) are respectively provided on the other side of the contact sheet (52), and an annular spring (54) is installed on the outside of the contact sheet (52).

2. An indoor high-voltage vacuum circuit breaker according to claim 1, characterized in that: Grooves (9) are evenly formed on the outer ring wall of the annular sheet (51) along the circumferential direction, and a clamping groove (8) matching the groove (9) is formed on the contact sheet (52).

3. An indoor high-voltage vacuum circuit breaker according to claim 1, characterized in that: A limiting groove (7) is provided on the outer side of the contact piece (52), and the annular spring (54) is installed in the limiting groove (7).

4. An indoor high-voltage vacuum circuit breaker according to claim 1, characterized in that: An annular groove (6) is provided on the outer side of the contact arm (4).

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