CN213781954U

CN213781954U - Circuit breaker

Info

Publication number: CN213781954U
Application number: CN202022510481.4U
Authority: CN
Inventors: 陈琳; 朱天胜; 顾益
Original assignee: Changshu Switchgear Manufacturing Co Ltd
Current assignee: Changshu Switchgear Manufacturing Co Ltd
Priority date: 2020-11-03
Filing date: 2020-11-03
Publication date: 2021-07-23
Anticipated expiration: 2030-11-03

Abstract

The utility model relates to a circuit breaker, including base (1) and set up at the inside conductive loop of base (1), its characterized in that: and a heat insulation bulge (3) is arranged on the wall body, close to the conductive loop, of the base (1), and the conductive loop is placed on the heat insulation bulge (3) so that an air heat insulation layer is formed between the conductive loop and the wall body of the base (1). When the heat of the conductive loop is transferred to the base, the thermal resistance between the conductive loop and the base is increased because the thermal conductivity of the air is far smaller than that of the base made of the plastic material, so that the heat of the conductive loop can be effectively isolated from being transferred to the base, and the temperature rise of the base is reduced.

Description

Circuit breaker

Technical Field

The utility model relates to a circuit breaker especially relates to a moulded case circuit breaker.

Background

The molded case circuit breaker serves as an electrical element widely used in a power system, and in the actual use process, the molded case circuit breaker has specific requirements on the temperature rise of the part which can be directly contacted by an operator, wherein the parts which can be directly contacted comprise a handle, a surface cover, a base side wall, a base bottom and a wire inlet and outlet terminal. From the existing situation, the problem of overhigh temperature rise generally exists at the parts which can be directly contacted, the overhigh temperature rise not only influences the performance and the service life of the electric appliance of the circuit breaker, but also can cause fire disasters and casualties and property loss.

The reason why the temperature of the above-mentioned parts of the molded case circuit breaker is too high is the heat conduction generated by the contact of the heating parts of the molded case circuit breaker and the base of the case. Moulded case circuit breaker's the part that generates heat mainly includes contact system, flexible coupling and connecting plate etc. at the circuit breaker during operation, the part that generates heat can produce joule heat, if the part that generates heat touches the inside wall and the bottom of base, will be through the outside transmission part heat in lateral wall and the bottom of base, if these heats can not be timely effectual radiate the circuit breaker outside, will cause the lateral wall and the bottom temperature rise of shell too high, influence the life of circuit breaker and lead to the fact the potential safety hazard to operating personnel.

Disclosure of Invention

The utility model aims at providing a circuit breaker solves to have heat-conduction and lead to the too high problem of base temperature rise between electrically conductive return circuit and base.

In order to achieve the above purpose, the utility model adopts the technical scheme that: the utility model provides a circuit breaker, includes the base and sets up the electrically conductive return circuit in the base inside, be provided with thermal-insulated arch on the wall body that is close to with electrically conductive return circuit on the base, electrically conductive return circuit passes through thermal-insulated arch makes and forms the air insulating layer between electrically conductive return circuit and the base wall body.

The relevant content in the above technical solution is explained as follows:

1. in the above scheme, the conductive loop includes a contact system, a first connection terminal and a second connection terminal, one end of the first connection terminal is connected to an external circuit, the other end of the first connection terminal is electrically connected to one end of the contact system, the other end of the contact system is electrically connected to one end of the second connection terminal, the other end of the second connection terminal is connected to the external circuit, and the conductive loop is switched on/off by contact/separation of the contact system.

2. In the above scheme, the thermal-insulated arch that corresponds the below setting of first binding post on the wall body of base is first thermal-insulated arch.

3. In the above scheme, the thermal-insulated arch that sets up corresponding second binding post's below on the wall body of base is the thermal-insulated arch of second.

4. In the above scheme, the contact system includes a fixed contact and a movable contact rotatably arranged and matched with the fixed contact, one end of the fixed contact is electrically connected with the other end of the first wiring terminal, the movable contact is electrically connected with the second wiring terminal, and the conduction/disconnection of the conductive loop is realized by the contact/separation of the movable contact and the fixed contact.

5. In the above-mentioned scheme, the thermal-insulated arch that sets up corresponding the below of static contact on the base wall body is the third thermal-insulated arch.

6. In the above scheme, the contact system further includes a flexible connection disposed between the moving contact and the second connection terminal, one end of the flexible connection is electrically connected to the second connection terminal, and the other end of the flexible connection is electrically connected to the moving contact.

7. In the above scheme, the contact system further includes a flexible connection disposed between the fixed contact and the first connection terminal, one end of the flexible connection is electrically connected to the first connection terminal, and the other end of the flexible connection is electrically connected to the fixed contact.

8. In the above scheme, the heat insulation protrusion arranged below the corresponding flexible connection on the wall body of the base is a fourth heat insulation protrusion.

9. In the above scheme, the heat insulation protrusion arranged on the side of the base wall body corresponding to the flexible connection is a fifth heat insulation protrusion.

10. In the above scheme, the heat insulation protrusion is formed by arranging a plurality of cylinders.

Compared with the prior art, the utility model have following advantage:

the utility model discloses the circuit breaker is provided with thermal-insulated arch on the wall body that is pressed close to with conductive loop on the base, makes to form the air insulating layer between conductive loop and the base, when conductive loop's heat transfer to base, because the thermal conductivity of air is far less than the thermal conductivity of the base of plastics material, makes the thermal resistance between conductive loop and the base increase, can effectively keep apart conductive loop's heat transfer to base, reduces the base temperature rise.

Drawings

FIG. 1 is a schematic structural diagram of an embodiment of the present invention;

FIG. 2 is a perspective view of a base according to an embodiment of the present invention;

fig. 3 is a perspective view of a base according to another embodiment of the present invention.

In the above drawings: 1. a base; 2. a static contact component contact system; 21. static contact; 22. a moving contact of a second connecting terminal; 23. soft connection; 3. heat insulation protrusions; 31. a first heat-insulating projection; 32. a second heat-insulating projection; 33. a third heat-insulating projection; 34. a fourth heat-insulating projection; 35. a fifth heat insulating protrusion; 4. a second connecting terminal of the moving contact component; 41. a moving contact; 42. soft connection; 43. first binding post 5, first binding post.

Detailed Description

The invention will be further described with reference to the following drawings and examples:

example (b): referring to fig. 1, 2 and 3:

the utility model provides a circuit breaker, includes base 1 and sets up the electrically conductive return circuit in base 1 inside, be provided with thermal-insulated arch 3 on the wall body that is close to with electrically conductive return circuit on base 1, electrically conductive return circuit shelf pass through on the thermal-insulated arch 3, make and form the air insulating layer between electrically conductive return circuit and the base 1 wall body. The conductive loop is formed by the following steps: the conductive loop comprises a contact system 2, a first wiring terminal 5 and a second wiring terminal 4, one end of the first wiring terminal 5 is connected with an external circuit, the other end of the first wiring terminal 5 is electrically connected with one end of the contact system 2, the other end of the contact system 2 is electrically connected with one end of the second wiring terminal 4, the other end of the second wiring terminal 4 is connected with the external circuit, and the conduction/disconnection of the conductive loop is realized through the contact/separation of the contact system 2. Specifically, the contact system 2 includes a fixed contact 21 and a movable contact 22 rotatably disposed and matched with the fixed contact 21, one end of the fixed contact 21 is electrically connected to the other end of the first connection terminal 5, the movable contact 22 is electrically connected to the second connection terminal 4, and the conduction/disconnection of the conductive loop is realized by the contact/separation of the movable contact 22 and the fixed contact 21.

The heat insulation bump 3 comprises a first heat insulation bump 31, a second heat insulation bump 32 and a third heat insulation bump 33 which are arranged near each component of the conductive circuit. The first heat insulation protrusion 31, the second heat insulation protrusion 32, and the third heat insulation protrusion 33 are arranged such that:

and a heat insulation bulge 3 is arranged between the first wiring terminal 5 and the wall body of the base 1. Specifically, the heat insulation protrusion 3 provided on the wall body of the base 1 below the first connection terminal 5 is a first heat insulation protrusion 31.

And a heat insulation bulge 3 is arranged between the second wiring terminal 4 and the wall body of the base 1. Specifically, the heat insulation protrusion 3 provided on the wall body of the base 1 below the second connection terminal 4 is a second heat insulation protrusion 32.

And a heat insulation bulge 3 is arranged between the static contact 21 and the wall body of the base 1. Specifically, the heat insulation protrusion 3 disposed on the wall of the base 1 below the fixed contact 21 is a third heat insulation protrusion 33.

And a heat insulation bulge 3 is arranged below one or more of the first wiring terminal 5, the second wiring terminal 4 and the fixed contact 21 and is most commonly applied to a double-breakpoint circuit breaker.

Besides, in the single-break circuit breaker, in addition to the first heat insulation protrusion 31, the second heat insulation protrusion 32, and the third heat insulation protrusion 33 described above, a fourth heat insulation protrusion 34 and a fifth heat insulation protrusion 35 are provided, and the fourth heat insulation protrusion 34 and the fifth heat insulation protrusion 35 are arranged such that: the contact system 2 further includes a flexible connection 23, in an embodiment of the present invention, as shown in fig. 1, one end of the flexible connection 23 is electrically connected to the movable contact 22, and the other end of the flexible connection 23 is electrically connected to one end of the second connection terminal 4. And a heat insulation bulge 3 is arranged between the flexible connection 23 and the wall body of the base 1. Specifically, the heat insulation protrusion 3 disposed on the wall body of the base 1 corresponding to the lower portion of the flexible connection 23 is a fourth heat insulation protrusion 34, and the flexible connection 23 is in a fluffy state and is easily touched on the side wall of the wall body of the base 1, so the heat insulation protrusion 3 disposed on the wall body of the base 1 corresponding to the side of the flexible connection 23 is a fifth heat insulation protrusion 35.

Of course, according to the structure of the circuit breaker, the flexible connection 23 may also be disposed between the fixed contact 21 and the first connection terminal 5, as shown in fig. 3, one end of the flexible connection 23 is electrically connected to the first connection terminal 5, and the other end is electrically connected to the fixed contact 2. Likewise, heat insulation projections 3 can be provided on the wall of the base 1 below or beside the flexible connection 23.

Of course, in practical products, for example, in an embodiment, the fixed contact 21 and the first connection terminal 5 may be one part, or two parts may be electrically connected to each other. A release can be connected in series in the conductive loop and used for overload and short-circuit protection of the circuit breaker and the like.

Specifically, the heat insulation protrusion 3 may be formed by arranging a plurality of columns, and of course, the heat insulation protrusion 3 may be formed by a plurality of points in other shapes. In this embodiment, the cross-sectional shape of the heat insulation protrusion 3 is circular, and the cross-sectional shape may be square, rectangular, or triangular.

This embodiment makes and forms the air insulating layer between conductive loop and the base 1 through set up thermal-insulated arch 3 in conductive loop corresponding position, when conductive loop's heat transfer to base 1, because the thermal conductivity of air is far less than the thermal conductivity of the base 1 of plastics material, makes the thermal resistance between conductive loop and the base 1 increase, can effectively keep apart conductive loop's heat transfer to base 1, reduces the temperature rise of base 1.

The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose of the embodiments is to enable people skilled in the art to understand the contents of the present invention and to implement the present invention, which cannot limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered by the protection scope of the present invention.

Claims

1. A circuit breaker comprises a base (1) and a conductive loop arranged inside the base (1), and is characterized in that: and a heat insulation bulge (3) is arranged on the wall body, close to the conductive loop, of the base (1), and the conductive loop enables an air heat insulation layer to be formed between the conductive loop and the wall body of the base (1) through the heat insulation bulge (3).

2. The circuit breaker of claim 1, wherein: the conductive loop comprises a contact system (2), a first wiring terminal (5) and a second wiring terminal (4), one end of the first wiring terminal (5) is connected with an external circuit, the other end of the first wiring terminal (5) is electrically connected with one end of the contact system (2), the other end of the contact system (2) is electrically connected with one end of the second wiring terminal (4), the other end of the second wiring terminal (4) is connected with the external circuit, and the conduction/disconnection of the conductive loop is realized through the contact/separation of the contact system (2).

3. The circuit breaker of claim 2, wherein: the heat insulation bulge (3) arranged on the wall body of the base (1) and corresponding to the lower part of the first wiring terminal (5) is a first heat insulation bulge (31).

4. The circuit breaker of claim 2, wherein: the heat insulation bulge (3) arranged on the wall body of the base (1) corresponding to the lower part of the second wiring terminal (4) is a second heat insulation bulge (32).

5. The circuit breaker of claim 2, wherein: the contact system (2) comprises a fixed contact (21) and a movable contact (22) which is rotatably arranged and matched with the fixed contact (21), one end of the fixed contact (21) is electrically connected with the other end of the first wiring terminal (5), the movable contact (22) is electrically connected with the second wiring terminal (4), and the conduction/disconnection of the conductive loop is realized through the contact/separation of the movable contact (22) and the fixed contact (21).

6. The circuit breaker of claim 5, wherein: the heat insulation bulge (3) arranged on the wall body of the base (1) and corresponding to the lower part of the static contact (21) is a third heat insulation bulge (33).

7. The circuit breaker of claim 5, wherein: the contact system (2) further comprises a flexible connection (23) arranged between the moving contact (22) and the second wiring terminal (4), one end of the flexible connection (23) is electrically connected with the second wiring terminal (4), and the other end of the flexible connection (23) is electrically connected with the moving contact (22).

8. The circuit breaker of claim 5, wherein: the contact system (2) further comprises a flexible connection (23) arranged between the static contact (21) and the first wiring terminal (5), one end of the flexible connection (23) is electrically connected with the first wiring terminal (5), and the other end of the flexible connection (23) is electrically connected with the static contact (21).

9. The circuit breaker according to claim 7 or 8, characterized in that: the heat insulation bulge (3) arranged on the wall body of the base (1) corresponding to the lower part of the flexible connection (23) is a fourth heat insulation bulge (34).

10. The circuit breaker according to claim 7 or 8, characterized in that: the heat insulation bulge (3) arranged on the wall body of the base (1) corresponding to the side of the flexible connection (23) is a fifth heat insulation bulge (35).

11. The circuit breaker of claim 1, wherein: the heat insulation bulge (3) is formed by arranging a plurality of cylinders.