GB2568170A

GB2568170A - Circuit breaker cradle

Info

Publication number: GB2568170A
Application number: GB1821306.6A
Authority: GB
Inventors: Zhao Jianping
Original assignee: Individual
Current assignee: Individual
Priority date: 2016-08-30
Filing date: 2016-08-30
Publication date: 2019-05-08
Anticipated expiration: 2036-08-30
Also published as: GB2568170B; RU2709189C1; KR102147056B1; CN109417003A; JP2019533877A; WO2018039891A1; KR20190029578A; CN109417003B; GB201821306D0; JP6752351B2

Abstract

A circuit breaker cradle comprises a left support (21) and a right support (22). The left support (21) and the right support (22) are made of a plastic material and arranged opposite to each other. A fan-shaped engagement recess is arranged at each of the left support (21) and the right support (22). A supporting plate (23) is provided inside the engagement recess. Two arms (31) of a lever for engagement and disengagement (30) respectively engage at the corresponding engagement recesses and abut against the supporting plates (23). The support is made of a plastic material rather than a metal material commonly used in the same type of products, thereby preventing a movement direction of an electric arc from being negatively affected by a magnetic loop generated by a metal support in a breaking process performed by a circuit breaker, preventing attachment of a metal particle generated by the electric arc in the breaking process, and preventing temperature rise performance of the circuit breaker from being negatively affected by an eddy current generated by the metal support in an energization process. The plastic support is formed by means of an injection molding technique, requires a simple process, can be processed easily, and has high precision. The supporting plate (23) increases the hardness of a surface where the plastic support is in contact with the lever for engagement and disengagement (30), increases a rotation speed of the lever for engagement and disengagement (30) relative to the support, thereby facilitating breaking capability of the circuit breaker.

Description

Circuit Breaker Cradle

Technical Field

The present invention relates to a circuit breaker, and more particularly, to a circuit breaker cradle.

Background Art

As a circuit breaker is used for protecting lines or apparatuses against short circuits, its breaking capability is an operating parameter of great importance. Currently, supports for the drive mechanism of the circuit breaker are generally made of a metal material. As shown in Figures 6-9, a lever 3 cooperates with left and right metal supports 2 to form a U-shaped conductor. In the breaking process of the circuit breaker, the magnetic loop generated by the U-shaped conductor may draw an electric arc formed at the position of a contact 1 towards the metal supports 2 (as shown in Figure 9, an electric current arrow 10 represents the direction of an electric current, and a magnetic loop arrow 12 represents the direction of magnetic loops generated by the metal supports 2; and as shown in Figure 8, an electric arc arrow 11 represents the motion direction of an electric arc under the action of a magnetic loop), which is unfavorable for extinguishing the electric arc effectively and as quickly as possible. Moreover, metal particles generated in the breaking process may attach to the metal supports 2, thereby affecting the action performance of the mechanism. Besides, in the energization process of the circuit breaker, the U-shaped conductor may generate an eddy current 13, which may give out heat, thereby affecting the temperature rise performance of the circuit breaker. Further, the metal supports 2 are formed by means of a cold-punching molding technique, which are featured by the requirement of various processes and complicated processing, and their precision may not be effectively guaranteed. As such, the matching precision of the entire drive mechanism may be affected, thereby affecting the action performance of the mechanism.

Thus it can be seen that the prior circuit breaker of such a structure has the following disadvantage: as its metal supports are featured by complicated processing and low precision, the movement direction of the electric arc may be affected in the breaking process, thereby hampering the improvement on its breaking capability.

Summary of the Invention

The technical problem to be solved by the present invention is about the disadvantage existing in the prior circuit breaker of such a structure that as its metal supports are featured by complicated processing and low precision, the movement direction of the electric arc may be affected in the breaking process, thereby hampering the improvement on its breaking capability.

In order to solve the above technical problem, the present invention adopts the following technical solution: a circuit breaker cradle comprising a left support and a right support that are made of plastic, wherein the left support and the right support are arranged opposite to each other, a fan-shaped engagement recess is arranged at each of the left support and the right support; a metallic supporting plate is provided inside the engagement recess; two arms of a lever for engagement and disengagement respectively engage at the corresponding engagement recesses and abut against the supporting plate.

In the above solution, the engagement recess comprises a circular arc portion and straight line portions extending along two ends of the circular arc portion in a tangent direction, and the lever for engagement and disengagement is rotatable arranged between the two straight line portions.

In the above solution, the supporting plate is provided with a rounded comer, and the rounded comer extends outwardly along its own vertical direction to form an arc-shaped footpad engaged and fixed into the circular arc portion.

In the above solution, the supporting plate extends outward in a vertical direction thereof to form plug-in boards, wherein the plug-in boards are two in number, and are respectively arranged in a direction tangent to the rounded comer, and the insertion plate is engaged and fixed into the straight line portions.

In the above solution, the supporting plate is provided with symmetrical positioning notches corresponding in shape to the engagement recess.

In the above solution, the supporting plate is provided with a plurality of fixing holes.

In the above solution, the circular arc portion has the same radian as a bottom end of each of the arms.

In the above solution, the left support and the right support are each provided thereon with a mounting frame adapted to be fixed to a housing, wherein the engagement recess is arranged on the mounting frame.

In the present invention, the support is made of plastic rather than a metal material commonly used in the same type of products, thereby preventing a movement direction of an electric arc from being negatively affected by a magnetic loop generated by a metal support in a breaking process performed by a circuit breaker, preventing the action performance of the mechanism from being affected as a result of attachment of a metal particle generated in the breaking process, and preventing the temperature rise performance of the circuit breaker from being negatively affected by an eddy current generated by the metal support in power on process. The plastic support is formed by means of an injection molding technique, which requires a simple process, can be processed easily, and has high precision, thereby overcoming the drawback that the metal support formed by means of cold-punching molding is featured by the requirement of various processes and great errors; meanwhile, in order to avoid the drawback of low hardness resulting from plastic materials, a piece of metallic supporting plate is partially embedded into the plastic support, which improves the hardness of a surface where the plastic support is in contact with the lever for engagement and disengagement, and increases a rotation speed of the lever for engagement and disengagement relative to the support, thereby facilitating breaking capability of the circuit breaker.

Brief Description of the Drawings

Figure 1 is a structural schematic diagram of the present invention arranged on a circuit breaker;

Figure 2 is a structural schematic diagram of a left support of the present invention;

Figure 3 is a structural schematic diagram of a supporting plate of the present invention;

Figure 4 is a structural schematic diagram of a lever for engagement and disengagement matched with the present invention;

Figure 5 is a structural schematic diagram of the lever for engagement and disengagement of the present invention arranged within an engagement recess;

Figure 6 is a structural schematic diagram of a circuit breaker having the same type of structure as the present invention;

Figure 7 is a structural schematic diagram of a metal support in Figure 6;

Figure 8 is a partial structural schematic diagram of Figure 6;

Figure 9 is a simplified schematic diagram of Figure 8.

Detailed Description of the Invention

The present invention will now be described below in detail in conjunction with specific embodiments and the drawings of the description.

As shown in Figures 1 and 2, a circuit breaker cradle provided by the present invention is arranged on a housing 10, the circuit breaker comprises a left support 21 and a right support 22 that are made of plastic, and the left support 21 and the right support 22 arranged opposite to each other. A fan-shaped engagement recess is arranged at each of the left support 21 and the right support 22. A metallic supporting plate 23 is provided inside the engagement recess. Two arms 31 of a lever for engagement and disengagement 30 respectively engage at the corresponding engagement recesses and abut against the supporting plates 23.

Preferably, in conjunction with Figure 5, the engagement recess comprises a circular arc portion 241 and straight line portions 242 extending along two ends of the circular arc portion 241 in a tangent direction. The two straight line portions 242 form the opening and closing range of the lever for engagement and disengagement 30, and the lever for engagement and disengagement 30 is rotatable arranged between the two straight line portions 242.

Preferably, as shown in Figure 3, the supporting plate 23 is provided with a rounded comer, wherein the rounded comer extends outwardly along its own vertical direction to form an arc-shaped footpad 231 engaged and fixed into the circular arc portion 241. The supporting plate 23 extends outwardly along its own vertical direction to form plug-in boards 232, wherein the plug-in boards 232 are two in number, and are respectively arranged in a direction tangent to the rounded comer, and engaged and fixed into the straight line portions 242. The supporting plate 23 is provided with symmetrical positioning notches 233 corresponding in shape to the engagement recess. Such a structure can not only enable the supporting plate 23 to be engaged and fixed into the engagement recess, but also facilitate rapid installation and positioning, and dislocation is less likely to occur after installation.

Preferably, the supporting plate 23 is provided with a plurality of fixing holes 234, such that the supporting plate 23 may be fixed on the left support 21 or the right support 22.

Preferably, in conjunction with Figures 3 and 4, the circular arc portion 241 has the same radian as a bottom end of each of the arms 31. In this manner, the lever for engagement and disengagement 30 is always engaged with the circular arc portion 241 during opening and closing, thereby rendering its engagement and disengagement more stable.

In the present invention, the support is made of plastic rather than a metal material commonly used in the same type of products, thereby preventing a movement direction of an electric arc from being negatively affected by a magnetic loop generated by a metal support in a breaking process performed by a circuit breaker, preventing the action performance of the mechanism from being affected as a result of attachment of a metal particle generated in the breaking process, and preventing the temperature rise performance of the circuit breaker from being negatively affected by an eddy current generated by the metal support in an energization process. The plastic support is formed by means of an injection molding technique, which requires a simple process, can be processed easily, and has high precision, thereby overcoming the drawback that the metal support formed by means of cold-punching molding is featured by the requirement of various processes and great errors; meanwhile, in order to avoid the drawback of low hardness resulting from plastic materials, a piece of metallic supporting plate is partially embedded into the plastic support, which improves the hardness of a surface where the plastic support is in contact with the lever for engagement and disengagement, and increases a rotation speed of the lever for engagement and disengagement relative to the support, thereby facilitating breaking capability of the circuit breaker.

The present invention is not limited to the above preferred embodiments. It should be appreciated by anyone that structural changes made under the inspiration of the present invention shall fall within the scope of protection of the present invention so long as their technical solutions are identical or similar to those of the present invention.

Claims

1. A circuit breaker cradle comprising a left support and a right support that are made of plastic, wherein the left support and the right support are arranged opposite to each other, a fan-shaped engagement recess is arranged at each of the left support and the right support; a metallic supporting plate is provided inside the engagement recess; two arms of a lever for engagement and disengagement respectively engage at the corresponding engagement recesses and abut against the supporting plate.

2. The circuit breaker cradle according to claim 1, wherein the engagement recess comprises a circular arc portion and straight line portions extending along two ends of the circular arc portion in a tangent direction, and the lever for engagement and disengagement is rotatable arranged between the two straight line portions.

3. The circuit breaker cradle according to claim 2, wherein the supporting plate is provided with a rounded comer, and the rounded comer extends outwardly along its own vertical direction to form an arc-shaped footpad engaged and fixed into the circular arc portion.

4. The circuit breaker cradle according to claim 3, wherein the supporting plate extends outward in a vertical direction thereof to form plug-in boards, whose number is two, and which are respectively arranged in a direction tangent to the rounded comer, and the insertion plate is engaged and fixed into the straight line portions.

5. The circuit breaker cradle according to claim 1, wherein the supporting plate is provided with symmetrical positioning notches, and the symmetrical positioning notches corresponding in shape to the engagement recess.

6. The circuit breaker cradle according to claim 1, wherein the supporting plate is provided with a plurality of fixing holes.

7. The circuit breaker cradle according to claim 2, wherein the circular arc portion has the same radian as a bottom end of each of the arms.

8. The circuit breaker cradle according to claim 1, wherein the left support and the right support are each provided thereon with a mounting frame adapted to be fixed to a housing, and the engagement recess is arranged on the mounting frame.