CN219203069U

CN219203069U - Rotating shaft of multipole circuit breaker

Info

Publication number: CN219203069U
Application number: CN202320137180.2U
Authority: CN
Inventors: 马俊贤; 谢心意; 王铖
Original assignee: Changshu Switchgear Manufacturing Co Ltd
Current assignee: Changshu Switchgear Manufacturing Co Ltd
Priority date: 2023-01-16
Filing date: 2023-01-16
Publication date: 2023-06-16
Anticipated expiration: 2033-01-16

Abstract

A rotating shaft of a multipole circuit breaker belongs to the technical field of low-voltage electric appliances. The utility model provides a circuit breaker's moving contact wears to establish in holding the intracavity with the axial in proper order in the pivot, and the moving contact be equipped with the moving contact the free end of the moving contact stretch out with holding the communicating first opening in chamber on the circumference lateral wall of pivot, thereby realize the switch-on and the disconnection of main loop through the contact and the separation of moving contact and stationary contact, the moving contact has the link with above-mentioned free end reverse extension, be fixed with the flexonics on the link, the flexonics stretches out with holding the communicating second opening of chamber through on the circumference lateral wall of pivot and is connected with main loop in order to supply the moving contact, characteristics are: the side wall of one side or two sides of the circumferential side wall of the rotating shaft, which is adjacent to the second opening in the axial direction, is provided with a concave part so as to increase the creepage distance between the soft connection of two adjacent poles. The advantages are that: the creepage distance between the soft connections of adjacent poles on the rotating shaft is increased, the dielectric property of the circuit breaker is improved, and the breaking property of the circuit breaker is ensured.

Description

Rotating shaft of multipole circuit breaker

Technical Field

The utility model belongs to the technical field of piezoelectric devices, and particularly relates to a rotating shaft of a multipole circuit breaker.

Background

With the development of new energy industry at present, the working voltage of the plastic shell circuit breaker is higher and higher, especially for the photovoltaic plastic shell circuit breaker, the working voltage of the plastic shell circuit breaker reaches 1500V or 1140V, and the phase interval of the circuit breaker is usually not greatly changed due to the restriction of factors such as installation habit, arrangement in a cabinet, market quotation and the like, so that great test is brought to the phase interval voltage-resistant level of the circuit breaker.

For plastic case circuit breakers, especially single breakpoint plastic case circuit breakers, soft connection, namely copper braided wires, are usually arranged inside to facilitate the rotation of a moving contact, and once the main loop is connected with current, the soft connection contacted with a rotating shaft is heated to expand, so that the creepage distance between the soft connection of two adjacent poles is reduced. As shown in fig. 1, the flexible connection 221 expands to contact with the side wall 13 of the shaft body 100 of the rotating shaft 1, through which the moving contact 2 is inserted, and the opening from which the flexible connection 221 protrudes, so that the minimum creepage distance between the phases on the rotating shaft 1 from the edge one 131a of the shaft body 100 is from the neck-shaped bearing shaft 101, the inter-phase flange 102 to the edge two 131b of the other shaft body 100 adjacent to the shaft body 100 corresponding to the edge one 131a along the surface of the rotating shaft 1, in this case, the thickness of the side wall 13 of the opening contacted by the flexible connection 221 after expansion cannot be calculated into the creepage distance, and in the actual working process of the circuit breaker, the creepage distance is reduced than expected, so that the dielectric performance of the circuit breaker itself is reduced, and the breaking performance of the circuit breaker itself is affected.

In view of the above prior art, there is a need for a rational improvement in the construction of the rotary shaft of existing multipole circuit breakers. To this end, the applicant has made an advantageous design, and the technical solutions described below are produced in this context.

Disclosure of Invention

The utility model aims to provide a rotating shaft of a multipole circuit breaker, which can increase the creepage distance between soft connections of adjacent poles on the rotating shaft, improve the dielectric property of the circuit breaker and ensure the breaking performance of the circuit breaker.

The utility model accomplishes the task like this, a kind of spindle of multipolar circuit breaker, there are several holding chambers in order to arrange axially in the said spindle, the moving contact of the said circuit breaker is worn to set up in holding chamber, and the free end with moving contact of the said moving contact stretches out through the first opening communicated with holding chamber on the circumference sidewall of the spindle, thus realize the connection and breaking of the main circuit through contact and separation of moving contact and stationary contact, the said moving contact has connecting end that extends opposite to above-mentioned free end, the said connecting end is fixed with the flexible link, the said flexible link stretches out in order to supply moving contact to connect with main circuit through the second opening communicated with holding chamber on the circumference sidewall of the spindle, characterized by: and a concave part is arranged on the side wall of one side or two sides of the circumferential side wall of the rotating shaft, which is adjacent to the second opening in the axial direction, so as to increase the creepage distance between the soft connection of two adjacent poles.

In a specific embodiment of the present utility model, the recess includes a recess side wall formed to extend radially toward a direction approaching a rotation center of the rotation shaft on the basis of the side wall, and a recess bottom wall formed to extend axially toward a cavity of an adjacent pole adjacent to the recess side wall.

In another specific embodiment of the utility model, the rotating shaft is formed by axially connecting shaft bodies with the same number as the poles of the circuit breaker, the cavity axially penetrates through the shaft bodies, and a first opening and a second opening are respectively formed on the circumferential side wall of the shaft bodies.

In yet another specific embodiment of the utility model, one side of the cavity extends to the circumferential side wall of the shaft such that the first opening and the second opening communicate on the circumferential side wall of the shaft.

In a further particular embodiment of the utility model, a neck-shaped load bearing shaft is formed between two adjacent shaft bodies, which cooperates with a spacer inside the circuit breaker housing to provide rotational support for the shaft.

In a further specific embodiment of the present utility model, the bearing shaft is provided with spaced flanges.

In a further specific embodiment of the utility model, the recess side wall extends radially to the rotation center direction of the rotation shaft by a distance of more than 2mm on the basis of the side wall.

In a further specific embodiment of the present utility model, the recess is provided on a side wall of one or both sides of the circumferential side wall of the rotating shaft, which side wall is adjacent to the second opening in the axial direction.

The utility model has the beneficial effects that due to the adoption of the structure, the utility model has the following advantages: through set up the depressed part on the circumference lateral wall between two adjacent holding chambers that are used for wearing to establish the moving contact in the pivot, compare in prior art, creepage distance has increased the distance that is provided by sunken diapire at least, has realized the target of creepage distance between the flexible coupling of increase adjacent two poles of earth, improves the dielectric property of circuit breaker, guarantees the breaking property of circuit breaker.

Drawings

Fig. 1 is a rotation axis view of a multipole circuit breaker according to the prior art.

Fig. 2 is a rotation axis view of the multipole circuit breaker according to the present utility model.

Fig. 3 is another angular view of the rotary shaft of the multipole circuit breaker according to the present utility model.

In the figure: 1. the rotary shaft comprises a rotary shaft body 100, a shaft body 101, a bearing shaft 102, an alternate flange 10, a containing cavity 11, a first opening 12, a second opening side walls 131a, edges I and 131b, edges II and 14, concave parts and 141, concave side walls and 142, and concave bottom walls; 2. the movable contact, 21, the free end, 22, the connecting end and 221, the flexible connection.

Description of the embodiments

The following detailed description of specific embodiments of the utility model, taken in conjunction with the accompanying drawings, is not intended to limit the scope of the utility model, but rather should be construed to cover any and all modifications that may fall within the spirit and scope of the utility model.

In the following description, any reference to the directions or azimuths of up, down, left, right, front and rear is based on the positions shown in the corresponding drawings, and therefore, should not be construed as a limitation on the technical solutions provided by the present utility model.

Referring to fig. 2 and 3, the present utility model relates to a rotating shaft of a multipole circuit breaker, wherein the multipole circuit breaker can be two poles, three poles or four poles, the power supply phases in the circuit are different, and the number of poles of the circuit breaker is different.

The circuit breaker include shell and contact system, operating device who sets up in the shell, contact system include pivot 1, moving contact 2 and stationary contact, operating device drive pivot 1 rotation, the moving contact 2 that pivot 1 drove it contacts and separates with the stationary contact, realizes switching on and breaking of circuit.

The rotating shaft 1 is supported and rotatably arranged in the shell through a phase separation plate arranged in the shell. The rotating shaft 1 is provided with a plurality of containing cavities 10 in sequence in the axial direction, a moving contact 2 of the circuit breaker is arranged in the containing cavities 10 in a penetrating manner, a free end 21 provided with a moving contact of the moving contact 2 protrudes out of a first opening 11 communicated with the containing cavities 10 on the circumferential side wall of the rotating shaft 1, so that the main circuit is connected and disconnected through the contact and separation of the moving contact and a fixed contact, the moving contact 2 is provided with a connecting end 22 which extends reversely to the free end 21, the connecting end 22 is fixedly provided with a flexible connection 221, the flexible connection 221 protrudes out of the second opening 12 communicated with the containing cavities 10 on the circumferential side wall of the rotating shaft 1 so as to be used for connecting the moving contact 2 with the main circuit, and a concave part 14 is arranged on a side wall 13, adjacent to the second opening 12 in the axial direction, of the circumferential side wall of the rotating shaft 1 so as to increase the creepage distance between the flexible connection 221 of two adjacent poles.

In the present embodiment, the shaft 1 is formed by axially connecting a number of substantially cylindrical shaft bodies 100 equal to the number of poles of the circuit breaker, the cavity 10 axially penetrates the shaft bodies 100, and in this embodiment, at an axial position of the shaft bodies 100, the cavity 10 is at a middle position of the shaft bodies 100, and one side of the cavity 10 extends to a circumferential side wall of the shaft bodies 100, so that the first opening 11 and the second opening 12 are communicated at the circumferential side wall of the shaft bodies 100. Of course, one side of the cavity 10 may not extend to the circumferential side wall of the shaft body 100, so that the first opening 11 and the second opening 12 are not communicated on the circumferential side wall of the shaft body 100, and the first opening 11 and the second opening 12 form a through passage on the shaft body 100 through the cavity 10.

The recess 14 is disposed on the shaft body 100 and is disposed on both sides of the second opening 12, and includes a recess side wall 141 formed to extend in a radial direction toward a direction approaching a rotation center of the rotation shaft 1 on the basis of the side wall 13, and a recess bottom wall 142 formed to extend in an axial direction toward the cavity 10 of an adjacent pole adjacent to the recess side wall 141. The recessed side wall 141 extends radially to the rotation center direction of the rotation shaft 1 by a distance of more than 2mm on the basis of the side wall 13.

In this embodiment, the recess portions 14 are provided at both end portions of the shaft body 100 adjacent to a bearing shaft 101 to be described later.

A neck-shaped bearing shaft 101 is formed between two adjacent shaft bodies 100, and is matched with a phase partition plate inside the circuit breaker shell to provide rotary support for the rotary shaft 1. The bearing shaft 101 is provided with the inter-phase flange 102, which is more beneficial to the running fit of the rotating shaft 1 and the inter-phase partition plate, and the creepage distance can be further increased.

The flexible connection wire 221 may be a copper braided wire, the other end of the copper braided wire is welded and fixed with a connecting terminal, the moving contact 2 is connected to the main loop through the connecting terminal, and the connection and disconnection of the circuit are realized by controlling the contact and the separation of the moving contact 2 and the static contact.

The flexible connection 221 is arranged at the connection end 22 of the moving contact 2, which is favorable for the rotation of the moving contact 2, however, once the main circuit is connected with current, the copper braided wire expands when being heated, and contacts with the side wall 13 adjacent to the second opening 12 in the axial direction, and the creepage distance path between the flexible connection 221 between the two adjacent poles is as follows: starting from the recessed side wall 141 on one shaft body 100, the creepage distance between the soft connections of adjacent poles (e.g., middle pole and right pole in fig. 2) is increased by increasing the distance provided by at least two recessed bottom walls 142 compared to the multipole circuit breaker of the prior art, by starting from the recessed bottom wall 142 of one shaft body 100, the load bearing shaft 101 between adjacent two shaft bodies 100, the inter-phase flange 102, the load bearing shaft 101 on the other side of the inter-phase flange 102, the recessed bottom wall 142 on the other shaft body 100 adjacent to the recessed bottom wall 142 of the previous shaft body 100, to the recessed side wall 141 on the other shaft body 100 adjacent to the recessed bottom wall 142 of the previous shaft body 100.

In the present utility model, the recess portions 14 are preferably provided on both sides of the second opening 12 in the axial direction, but the present utility model is not limited to this configuration, and in the case where the axial dimension of the rotary shaft 1 is large and the creepage distance is sufficient in the case of a circuit breaker having a large volume, the recess portions 14 may be provided only on one side of the second opening 12 in the axial direction.

Claims

1. The utility model provides a pivot of multipolar circuit breaker, a plurality of appearance chamber (10) have been arranged in proper order with the axial on pivot (1), moving contact (2) of circuit breaker wear to establish in appearance chamber (10), just moving contact's (2) be equipped with free end (21) of moving contact pass through on the circumference lateral wall of pivot (1) with hold chamber (10) communicating first opening (11) and stretch out to realize switch-on and breaking of main circuit through moving contact and static contact's contact, moving contact (2) have with above-mentioned free end (21) reverse extension link (22), be fixed with soft connection (221) on link (22), soft connection (221) stretch out with holding chamber (10) communicating second opening (12) on the circumference lateral wall of pivot (1) for moving contact (2) and main circuit connection, its characterized in that: the side wall (13) of the circumferential side wall of the rotating shaft (1) adjacent to the second opening (12) in the axial direction is provided with a concave part (14) so as to increase the creepage distance between the soft connections (221) of two adjacent poles.

2. The rotating shaft of a multipole circuit breaker according to claim 1, characterized in that: the recess (14) comprises a recess side wall (141) formed by extending radially to a direction approaching the rotation center of the rotating shaft (1) on the basis of the side wall (13), and a recess bottom wall (142) formed by extending axially to the direction of the accommodating cavity (10) of the adjacent pole and adjacent to the recess side wall (141).

3. The rotating shaft of a multipole circuit breaker according to claim 1, characterized in that: the rotating shaft (1) is formed by axially connecting shaft bodies (100) with the same number as the poles of the circuit breaker, the accommodating cavity (10) axially penetrates through the shaft bodies (100), and a first opening (11) and a second opening (12) are respectively formed in the circumferential side wall of the shaft bodies (100).

4. A spindle for a multipole circuit breaker according to claim 3, characterized in that: one side of the containing cavity (10) extends to the circumferential side wall of the shaft body (100) so that the first opening (11) and the second opening (12) are communicated on the circumferential side wall of the shaft body (100).

5. A spindle for a multipole circuit breaker according to claim 3, characterized in that: a neck-shaped bearing shaft (101) is formed between two adjacent shaft bodies (100), and is matched with a phase separation plate inside the circuit breaker shell to provide rotary support for the rotary shaft (1).

6. The rotating shaft of a multipole circuit breaker according to claim 5, characterized in that: the bearing shaft (101) is provided with a spaced flange (102).

7. The rotating shaft of a multipole circuit breaker according to claim 2, characterized in that: the distance that the concave side wall (141) extends to the rotation center direction of the rotating shaft (1) in the radial direction on the basis of the side wall (13) is more than 2mm.

8. The rotating shaft of a multipole circuit breaker according to claim 1, characterized in that: the concave part (14) is arranged on a side wall (13) of one side or two sides of the circumferential side wall of the rotating shaft (1) adjacent to the second opening (12) in the axial direction.