WO2018039891A1

WO2018039891A1 - Circuit breaker cradle

Info

Publication number: WO2018039891A1
Application number: PCT/CN2016/097251
Authority: WO
Inventors: 赵建平
Original assignee: 赵建平
Priority date: 2016-08-30
Filing date: 2016-08-30
Publication date: 2018-03-08
Also published as: GB2568170B; GB2568170A; RU2709189C1; KR102147056B1; CN109417003A; JP2019533877A; 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 bracket

Technical field

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

Background technique

Circuit breakers are used to short-circuit lines or equipment, and their breaking capacity is a very important operating parameter. At present, the material of the transmission mechanism of the circuit breaker is usually made of metal. As shown in Figure 6-9, the lever 3 and the left and right metal brackets 2 form a U-shaped conductor. During the circuit breaker breaking process, the magnetic circuit generated by the U-shaped conductor is generated. The arc formed by the position of the contact 1 is sucked toward the metal bracket 2 (the current arrow 10 in FIG. 9 represents the direction of the current, and the magnetic circuit arrow 12 represents the direction of the magnetic circuit generated by the metal bracket 2, the arc arrow 11 in FIG. Representing the direction of motion of the arc under the action of the magnetic circuit) is not conducive to the effective extinguishment of the arc as soon as possible; and the metal particles generated by the breaking process will adhere to the metal bracket 2, affecting the performance of the mechanism; secondly, during the energization of the circuit breaker, The U-shaped conductor will generate eddy current 13 and release heat, which will affect the temperature rise performance of the circuit breaker. Moreover, the metal bracket 2 adopts a cold forming process, which has many processes, complicated processing, and cannot be effectively guaranteed, which will affect the cooperation of the entire transmission mechanism. Accuracy, which affects the performance of the mechanism.

It can be seen that the current complex circuit breakers of this type have low complexity and low precision, which will affect the direction of the arc during the breaking process, which is not conducive to the problem of improving the breaking capacity.

Summary of the invention

The technical problem to be solved by the present invention is that the current circuit breaker has a metal frame with complicated complexity and low precision, which will affect the direction of the arc during the breaking process, which is not conducive to the problem of improving the breaking capacity.

In order to solve the above technical problem, the technical solution adopted by the present invention provides a circuit breaker bracket, which comprises a left bracket and a right bracket which are oppositely disposed and made of plastic material, and the left bracket and The right bracket is provided with a fan-shaped engaging groove, and the engaging groove is provided with a metal supporting plate, and the two legs of the split lever are respectively engaged in the corresponding engaging grooves and abut against The support plate.

In the above aspect, the engaging groove includes a circular arc portion and a straight portion extending tangentially along both ends of the circular arc portion, and the split lever is rotatably disposed between the two straight portions.

In the above solution, the support plate is provided with a rounded portion, and the rounded portion extends outward in a vertical direction thereof to form an arc-shaped stepped leg, and the curved foot is engaged and fixed in the circular arc portion.

In the above solution, the support plate extends outward in a vertical direction thereof to form a plug-in board, the number of the inserting boards is two, and is respectively disposed at a tangential direction of the rounded portion, and the inserting plate is engaged It is fixed in the straight portion.

In the above solution, the support plate is provided with a symmetrical positioning notch, and the positioning notch conforms to the shape of the engaging groove.

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

In the above aspect, the arc of the arc portion is the same as the arc of the bottom end of the leg.

In the above solution, the left bracket and the right bracket are respectively provided with a mounting frame for fixing to the housing, and the engaging slot is disposed on the mounting frame.

According to the invention, the bracket material replaces the common metal material of the similar products with plastic, which can eliminate the adverse influence of the magnetic circuit generated by the metal bracket on the arc strike during the breaking process of the circuit breaker; the adhesion of the metal particles generated during the breaking process can be avoided, and the mechanism action is affected. Performance; can avoid the adverse effect of the eddy current generated by the metal bracket on the temperature rise performance of the circuit breaker during the energization process; the plastic bracket adopts the injection molding process, the process is simple and easy to process, and the precision is high, which overcomes the processing steps of the cold-stamped metal bracket. The defect with large error; at the same time, in order to avoid the defect of low hardness of plastic material, a metal support plate is partially embedded on the plastic bracket to increase the hardness of the contact surface of the plastic bracket and the split lever, and accelerate the relative position of the split lever and the bracket. The rotation speed is beneficial to improve the breaking capacity of the circuit breaker.

DRAWINGS

Figure 1 is a schematic view showing the structure of the present invention disposed on a circuit breaker;

2 is a schematic structural view of a left bracket of the present invention;

3 is a schematic structural view of a support plate of the present invention;

Figure 4 is a schematic view showing the structure of a split lever adapted to the present invention;

Figure 5 is a schematic view showing the structure of the split lever of the present invention in the engaging groove.

Fig. 6 is a schematic view showing the structure of a circuit breaker of the same structure as the present invention.

FIG. 7 is a schematic structural view of the metal bracket of FIG. 6. FIG.

Figure 8 is a partial structural view of Figure 6.

Figure 9 is a simplified schematic view of Figure 8.

detailed description

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

As shown in FIG. 1 and FIG. 2, the circuit breaker bracket provided by the present invention is disposed on the casing 10, and includes a left bracket 21 and a right bracket 22 which are oppositely disposed and made of plastic materials, and the left bracket 21 and the right bracket 22 are disposed. Each of the engaging grooves is provided with a metal-shaped supporting plate 23, and the two legs 31 of the separating lever 30 are respectively engaged in the corresponding engaging grooves and abut against the supporting plate 23.

Preferably, as shown in FIG. 5, the engaging groove includes a circular arc portion 241 and a straight portion 242 extending tangentially along both ends of the circular arc portion 241. The two straight portions 242 form the opening and closing range of the split lever 30, and the split lever 30 is rotatably disposed between the two straight portions 242.

Preferably, as shown in FIG. 3, the support plate 23 is provided with a rounded portion, and the rounded portion extends outward in the vertical direction thereof to form an arc-shaped foot 231, and the curved foot 231 is engaged and fixed in the circular arc portion 241. The support plate 23 extends outward in the vertical direction thereof to form the inserting plate 232. The number of the inserting plates 232 is two, and is respectively disposed at the tangential direction of the rounded portion, and the inserting plate 232 is engaged and fixed in the straight portion 242. The support plate 23 is provided with a symmetrical positioning notch 233, and the positioning notch 233 is matched with the shape of the engaging groove. Such a structure can both fix and fix the support plate 23 and the engaging groove, and is also convenient for quick installation and positioning, and is not easily misplaced after installation.

Preferably, the support plate 23 is provided with a plurality of fixing holes 234 for fixing the support plate 23 to the left bracket 21 or the right bracket 22.

Preferably, in conjunction with FIGS. 3 and 4, the arc of the arc portion 241 is the same as the arc of the bottom end of the leg 31. Thus, the split lever 30 is always in a state of being brought into close contact with the circular arc portion 241 during the opening and closing process, so that the splitting is more stable.

The present invention is not limited to the above-described preferred embodiments, and any one skilled in the art should be aware of the structural changes made in the light of the present invention. Any technical solutions having the same or similar to the present invention fall within the protection scope of the present invention.

Claims

A circuit breaker bracket is characterized in that: a left bracket and a right bracket which are oppositely disposed and made of plastic material are provided, and the left bracket and the right bracket are respectively provided with a fan-shaped engaging slot, and the engaging slot is provided The support plate has a metal material, and the two legs of the split lever are respectively engaged in the corresponding engaging grooves and abut against the support plate.
The circuit breaker bracket according to claim 1, wherein the engaging groove comprises a circular arc portion and a straight portion extending tangentially along both ends of the circular arc portion, and the split lever rotates It is disposed between the two straight portions.
A circuit breaker bracket according to claim 2, wherein said support plate is provided with a rounded portion, and said rounded portion extends outward in a vertical direction thereof to form an arc-shaped stepped leg, said curved foot The snap fit is fixed in the arc portion.
The circuit breaker bracket according to claim 3, wherein the support plate extends outward in a vertical direction thereof to form a plug-in board, the number of the plug-in boards being two, and respectively disposed on the circle In the tangential direction of the corner portion, the insertion plate is engaged and fixed in the straight portion.
The circuit breaker bracket according to claim 1, wherein the support plate is provided with a symmetrical positioning notch, and the positioning notch conforms to the shape of the engaging groove.
A circuit breaker bracket according to claim 1, wherein said support plate is provided with a plurality of fixing holes.
A circuit breaker bracket according to claim 2, wherein the arc of the arc portion is the same as the arc of the bottom end of the leg.
The circuit breaker bracket according to claim 1, wherein the left bracket and the right bracket are respectively provided with a mounting frame for fixing to the housing, and the engaging slot is disposed in the On the installation box.