WO2021062922A1

WO2021062922A1 - Locking mechanism of circuit breaker

Info

Publication number: WO2021062922A1
Application number: PCT/CN2019/118733
Authority: WO
Inventors: 张广智; 卢嘉玉; 卢志刚
Original assignee: 上海良信电器股份有限公司
Priority date: 2019-09-30
Filing date: 2019-11-15
Publication date: 2021-04-08

Abstract

A locking mechanism of a circuit breaker, comprising a pair of side plates (1), a camshaft (2) arranged between the pair of side plates (1), a locking assembly (3), and a closing half shaft (6). The locking assembly (3) comprises a lever (31), a first shaft (313) fixed onto the lever (31), a shaft sleeve (314) rotating on the first shaft (313), a lever fulcrum shaft (312) rotating between the pair of side plates (1), a connecting rod (32), a locking lever (33), and a locking lever fulcrum shaft (332) rotating between the pair of side plates (1). A closing tripping system of the locking mechanism of a circuit breaker uses a five-stage connecting rod structure in an energy storage and closing process, and comprises an energy storage lever assembly, the camshaft (2), the lever (31), the connecting rod (32), and the locking lever (33). The force applied on related parts of the locking assembly (3) can be effectively reduced, and a remarkable technical effect is exerted.

Description

Locking mechanism of circuit breaker

Technical field

The invention relates to the field of low-voltage electrical appliances, in particular to an operating mechanism of a circuit breaker.

Background technique

As a kind of power distribution equipment, the circuit breaker plays the role of protecting electrical equipment in the power grid, that is, when a fault occurs in the power grid, such as a short-circuit current or a fault current, the circuit breaker interrupts the current to protect the electrical equipment and personnel in the power grid. Safety. In order to achieve the above protection function, an operating mechanism is provided inside the circuit breaker, which can separate the moving and static contacts of the circuit breaker by controlling the movement of the internal components of the operating mechanism, thereby cutting off the circuit, and the locking mechanism is the operating mechanism It is an important transmission control component.

With the improvement of circuit breaker performance indicators, the requirements for operating mechanisms are getting higher and higher. In addition, the homogeneity of operating institutions in the industry is serious and lacks novelty. At the same time, the existing operating mechanism generally has the following defects:

The closing and tripping system of the mechanism adopts a three-stage connecting rod structure in the process of energy storage and closing. The related parts in the closing and tripping system have the problem of large stress and easy failure after fatigue. The specific manifestations are as follows:

1. The lock lever is made of a single piece due to space reasons, and the parts are thin and long. The energy storage spring force passes through the three-stage linkage of the closing and tripping system (energy storage lever assembly, cam assembly, lock lever) to cause the lock lever The force is very large, and it is easy to be damaged after fatigue.

2. In the closing and tripping system, the lock lever has only one fulcrum axis, and the fulcrum shaft is fixed on the unilateral side plate. The fulcrum shaft of the lock lever is easily damaged after fatigue.

3. The cam roller shaft is thin due to space reasons, and the three-stage connecting rod structure causes the cam roller shaft to be very stressed, and it is easy to be damaged after fatigue.

Summary of the invention

In order to solve the above technical problems, the present invention provides a locking mechanism of a circuit breaker. The closing and tripping system adopts a five-stage linkage structure during the energy storage and closing process, which can effectively reduce the stress on the related parts of the locking assembly. Power situation.

In order to achieve the above-mentioned object of the invention, a locking mechanism of a circuit breaker provided by the present invention includes a pair of side plates, a camshaft arranged between the pair of side plates, a locking assembly, and a closing half shaft. The locking assembly includes Lever, shaft one fixed on said lever, shaft sleeve rotating on said shaft one, lever fulcrum shaft rotating between a pair of side plates, connecting rod, locking lever, between a pair of side plates Rotating lock lever fulcrum shaft.

Further, the camshaft includes a camshaft end axial surface that rotates between a pair of side plates, a camshaft cantilever buckle surface, and the camshaft cantilever buckle surface is in separable contact with the sleeve of the lock component.

Further, one end of the lever of the locking assembly is hinged with one end of the connecting rod, the lever rotates around the lever pivot axis, the other end of the connecting rod is hinged with one end of the locking lever, the The other end surface of the lock lever is in separable contact with the outer contour surface of the closing half shaft, the lock lever rotates around the lock lever fulcrum axis, and after the closing half shaft rotates, The arc surface of the lock lever can slide in the notch of the closing half shaft.

Further, the line of action of the camshaft cantilever buckle facing the driving force generated by the lever is X1, and the line of action X1 is between the lever fulcrum shaft and the lock lever fulcrum shaft.

Further, the line of action for the lever to generate a driving force through the connecting rod is X2, and the line of action is between the closing half shaft and the fulcrum shaft of the locking lever.

Further, the first spring is installed on the fulcrum shaft of the lock lever.

Further, the second spring is installed on the half-shaft for closing.

Further, the first spring is a torsion spring.

Further, the second spring is a torsion spring.

The closing and tripping system of the locking mechanism of the circuit breaker provided by the present invention adopts a five-stage connecting rod structure during the energy storage and closing process, which can effectively reduce the force of the relevant parts of the locking assembly, and achieve the following technologies effect:

1. The closing and tripping system adopts a five-stage connecting rod structure (energy storage lever assembly, camshaft, lever, connecting rod, locking lever), and the energy storage spring force is transferred to the locking lever of the locking assembly through the five-stage connecting rod The force is very small, and the fatigue resistance is enhanced, which effectively improves the service life of the lock lever and other parts;

2. The lock assembly has two fulcrum shafts (lever fulcrum shaft and lock lever fulcrum shaft), and both fulcrum shafts rotate on two side plates, reducing the force of a single fulcrum shaft and improving the fulcrum shaft Service life

3. The roller shaft (axis one) is changed from the cam to the lock assembly, and the roller shaft (axis one) has space to be thickened, which improves the service life of the roller shaft.

Description of the drawings

Fig. 1 is a structural schematic diagram of a lock mechanism of a circuit breaker of the present invention in an operating mechanism of the stored energy state.

Fig. 2 is a structural schematic diagram of the locking mechanism of a circuit breaker of the present invention in the state of discharging energy of the operating mechanism.

Fig. 3 is a schematic structural diagram of the locking mechanism of a circuit breaker of the present invention in a state where the operating mechanism is discharged.

Fig. 4 is a schematic diagram of the camshaft structure of the operating mechanism of a circuit breaker of the present invention.

Fig. 5 is a schematic structural diagram of a lock assembly of an operating mechanism of a circuit breaker of the present invention.

Fig. 6 is a schematic diagram of the closing half-shaft structure of the operating mechanism of a circuit breaker of the present invention.

Description of reference signs:

1: side plate; 101: fixed shaft one; 2: camshaft; 2a: camshaft end axial surface; 2b: camshaft cantilever buckle surface; 2c: camshaft cantilever outer circle surface; 3: lock component; 31: Lever; 311: lever plate; 312: lever pivot shaft; 313: shaft one; 314: shaft sleeve; 315: shaft pin; 32: connecting rod; 321: connecting rod plate; 322: shaft two; 323: shaft three; 33 : Locking lever; 331: Locking lever sheet; 331a: Locking lever surface; 331b: Locking lever arc surface; 332: Locking lever fulcrum shaft; 4: Spring 1; 5: Spring 2; 6: Closing half Shaft; 6a: the outer contour surface of the closing half shaft; 6b: the notch of the closing half shaft; 6c: the limit shaft of the closing half shaft.

Detailed ways

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

Referring to Figures 1 to 3, in this embodiment, a locking mechanism of a circuit breaker of the present invention includes: a pair of side plates 1, a camshaft 2 and a locking assembly 3 arranged between the pair of side plates 1 , Spring one 4, spring two 5, closing half shaft 6. The pair of side plates 1 are fixedly connected by a fixed shaft 101 or several other fixed shafts. The camshaft 2 includes a camshaft end axial surface 2a that rotates between a pair of side plates 1, a camshaft cantilever buckle surface 2b, and a camshaft cantilever outer circle surface 2c. The two end axial surfaces 2a of the camshaft 2 are arranged on a pair of side plates 1 and can rotate around them.

Referring to FIG. 5, the locking assembly 3 includes a lever 31, a connecting rod 32, and a locking lever 33. The lever 31 is fixed by two lever plates 311 through two shaft pins 315, the two lever plates 311 rotate on the lever fulcrum shaft 312, and the lever fulcrum shaft 312 rotates on a pair of side plates 1. The shaft 313 is fixed on the two lever plates 311, the shaft sleeve 314 is arranged on the shaft 313 and can rotate, and the shaft sleeve 314 is arranged between the two lever plates 311. One end of the two lever pieces 311 and the two connecting rod pieces 321 are hinged through the second shaft 322, and the two lever pieces 311 are arranged outside the two connecting rod pieces 321. The lock lever 33 includes a lock lever piece 331 and a lock lever fulcrum shaft 332. The lock lever fulcrum shaft 332 is fixed on the lock lever piece 331, and the lock lever fulcrum shaft 332 rotates on a pair of side plates 1. The other end of the two connecting rod pieces 321 and one end of the locking lever piece 331 are hingedly connected by the third shaft 323.

In this embodiment, the spring 4 adopts a torsion spring, which can save space, is convenient to install, and has good effect. It is installed on the fulcrum shaft 332 of the lock lever to generate a clockwise torsion force on the lock lever 33. The second spring 5 also adopts a torsion spring, which is mounted on the closing half shaft 6 to generate a clockwise torsion (restoring force) on the closing half shaft 6, which also has a good technical effect.

The surface 331a of the locking lever 33 can be detachably contacted with the outer contour surface 6a of the closing half shaft 6 (see Figure 6), and the limiting shaft 6c of the closing half shaft 6 can be detachably contacted with the features in the side plate 1 . The lock lever 33 rotates around the lock lever fulcrum shaft 332. When the closing half shaft 6 rotates on the pair of side plates 1, the arc surface 331b of the lock lever 33 can slide in the notch 6b of the closing half shaft 6 .

As shown in Figure 1, in the energy storage state of the operating mechanism of the lock mechanism of the circuit breaker, the camshaft 2 tends to rotate clockwise, the camshaft cantilever buckle surface 2b is in contact with the sleeve 314, and the camshaft cantilever buckle surface 2b faces the lever. The driving force generated by 31, the line of action of the driving force is X1, and the line of action X1 is between the lever fulcrum shaft 312 and the lock lever fulcrum shaft 332. The driving force causes the lever 31 to rotate clockwise around the lever fulcrum shaft 312. The lever 31 generates a driving force through the connecting rod 32. The line of action of the driving force is X2, and the line of action X2 is between the closing half shaft 6 and the fulcrum shaft 332 of the locking lever. The driving force causes the locking lever 33 to have a buckle The lever fulcrum shaft 332 has a tendency to rotate counterclockwise. The lock lever surface 331a is in contact with the outer contour surface 6a of the closing half shaft 6, and the closing half shaft 6 blocks the lock lever 33 from rotating counterclockwise.

1 to 3 again, the release process of the operating mechanism provided with the locking mechanism of a circuit breaker of the present invention is: when the closing half shaft 6 rotates counterclockwise, the locking lever 33 of the locking assembly 3 Rotate counterclockwise around the lock lever fulcrum shaft 332, the lock arc 331b slides into the notch 6b of the closing half shaft 6, the lock assembly 3 is folded, the lever 31 rotates clockwise around the lever fulcrum shaft 312, the lever 31 is fixed with After the shaft 101 contacts, the rotation of the camshaft cantilever buckle surface 2b of the camshaft 2 is separated from the sleeve 314 of the lock buckle assembly 3, and the camshaft 2 rotates clockwise. This state is the discharging process state, as shown in Figure 2. The lock lever 33 rotates clockwise under the torsion force of the spring 4, the lock assembly 3 is folded, the sleeve 314 contacts the camshaft cantilever outer surface 2c, and the closing half shaft 6 is clockwise under the torsion of the spring 2 5. Turning, the closing half shaft 6 contacts the arc surface 331b of the locking lever. This state is the release completion state.

It can be seen from the above description that the locking mechanism of the circuit breaker provided by the present invention adopts a five-stage linkage structure during the energy storage and closing process of the circuit breaker, which can effectively reduce the force on the relevant parts of the locking assembly. The specific situation is as follows:

1. The closing and tripping system adopts a five-stage connecting rod structure (energy storage lever assembly, camshaft 2, lever 31, connecting rod 32, lock lever 33), and the energy storage spring force is transmitted to the lock assembly through the five-stage connecting rod 3, the locking lever 33 has very little force, and the fatigue resistance is enhanced, which effectively improves the service life of the locking lever 33 and other parts;

2. The lock assembly has two fulcrum shafts (lever fulcrum shaft 312 and lock fulcrum shaft 332) and both fulcrum shafts rotate on two side plates to reduce the force of a single fulcrum shaft and increase the fulcrum shaft The service life;

3. The roller shaft (shaft one 313) is changed from the camshaft 2 to the lock assembly 3, and the roller shaft (shaft one 313) has space to be thickened, which improves the service life of the roller shaft.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention and not to limit it. Although the present invention has been described in detail with reference to the embodiments, those of ordinary skill in the art should understand that modifications or equivalent substitutions to the technical solutions of the present invention do not depart from the spirit and scope of the technical solutions of the present invention, and should be covered by the present invention. Within the scope of the claims.

Claims

A locking mechanism of a circuit breaker, characterized in that it comprises a pair of side plates, a camshaft (2) arranged between the pair of side plates (1), a locking assembly (3) and a closing half shaft (6) ), characterized in that the lock assembly (3) includes a lever (31), a shaft (313) fixed on the lever (31), and a shaft sleeve (313) that rotates on the shaft (313) 314), the lever pivot shaft (312) that rotates between a pair of side plates (1), the connecting rod (32), the locking lever (33), the locking lever that rotates between a pair of side plates (1) Pivot shaft (332).
The locking mechanism of a circuit breaker according to claim 1, wherein the camshaft (2) includes a camshaft end axial surface (2a) that rotates between a pair of side plates (1) , The camshaft cantilever buckle surface (2b), the camshaft cantilever buckle surface (2b) and the sleeve (314) of the lock component (3) can be detachably contacted.
The locking mechanism of a circuit breaker according to claim 1, wherein one end of the lever (31) of the locking assembly (3) is hinged with one end of the connecting rod (32), and the The lever (31) rotates around the lever pivot axis (312), the other end of the connecting rod (32) is hinged with one end of the lock lever (33), and the other end of the lock lever (33) (331a) in detachable contact with the outer contour surface (6a) of the closing half shaft (6), the lock lever (33) rotates around the lock lever fulcrum shaft (332), and in the After the closing half shaft (6) rotates, the arc surface (331b) of the locking lever (33) can slide in the notch (6b) of the closing half shaft (6).
The locking mechanism of a circuit breaker according to claim 2, wherein the line of action of the camshaft cantilever buckle surface (2b) on the driving force generated by the lever (31) is X1, and The line of action X1 is between the lever pivot axis (312) and the lock lever pivot axis (332).
The locking mechanism of a circuit breaker according to claim 2, characterized in that the line of action of the lever (31) to generate a driving force through the connecting rod (32) is X2, and the line of action X2 is in closing Between the brake half shaft (6) and the fulcrum shaft (332) of the lock lever.
The locking mechanism of a circuit breaker according to claim 1, wherein the spring one (4) is installed on the fulcrum shaft (332) of the locking lever.
The locking mechanism of a circuit breaker according to claim 1, wherein the second spring (5) is installed on the half-shaft (6) for closing.
The locking mechanism of a circuit breaker according to claim 6, wherein the spring one (4) is a torsion spring.
The latch mechanism of a circuit breaker according to claim 7, wherein the second spring (5) is a torsion spring.