WO2021062921A1

WO2021062921A1 - Operating mechanism for circuit breaker

Info

Publication number: WO2021062921A1
Application number: PCT/CN2019/118731
Authority: WO
Inventors: 卢嘉玉; 轩吉涛; 何春; 赵鹏
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

An operating mechanism for a circuit breaker, comprising a pair of side plates (1), a rotating shaft assembly (2), a connecting rod assembly (3) disposed between the pair of side plates (1), an energy storage lever assembly (4), a locking assembly (5), a spring assembly (6), a camshaft (7), a closing half shaft (8), an opening half shaft (9), and a pair of reset springs (10). The rotating shaft assembly (2) comprises a rotating shaft (201) and a cantilever (202) fixed on the rotating shaft (201); both ends of the rotating shaft (201) are respectively rotatably connected to the pair of side plates (1), so that the rotating shaft assembly (2) rotates on the pair of side plates (1). The solution achieves the reliability of the operating mechanism for a circuit breaker, and improves the product service life.

Description

Operating 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

In the electrical and electrical industry, the circuit breaker as a kind of power distribution equipment plays the role of protecting the 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 breaks the current to protect the power grid Safety of electrical equipment and personnel in 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 parts of the operating mechanism, thereby cutting off the circuit.

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:

1. The closing transmission is relatively low. The closing process of the mechanism needs to meet the requirement of overcoming the reaction force between the moving and static contacts when the stored energy spring is driven to the closing and opening contacts. When the state of reliable closing is satisfied, the reaction force between the moving and static contacts is the same as that when the stored energy spring is released. The ratio of the stored energy spring force is the closing transmission ratio. The higher the closing transmission ratio, the more beneficial it is to increase the mechanical life of the mechanism, and vice versa. Due to the discharge position of the energy storage spring and the impact position of the energy storage lever assembly and the connecting rod assembly of the existing mechanism, the closing transmission ratio of the existing mechanism is relatively low, which limits the upper limit of the improvement of its mechanical life;

2. The fulcrum shaft of the conversion lever and the camshaft are the same shaft, which results in the complicated force of the shaft, which needs to bear the force under the alternating load, and the shaft is prone to failure. When closing at the same time, the contact reaction force is transmitted to the switching lever fulcrum shaft (coaxial with the camshaft) through the connecting rod assembly. Compared with the opening energy storage, the camshaft bears more reaction force transmitted by the contact system. Therefore, the closing energy storage has a larger torque than the opening storage capacity, which increases the burden of manual energy storage and electric energy storage;

3. The problem that the switching lever of the opening and tripping system is too long, has low rigidity, and is prone to failure after fatigue. Because the conversion lever and the camshaft share the same shaft in the prior art, it is necessary to ensure that the connecting rod does not interfere with the energy storage lever assembly and the camshaft when moving, so the structural design is destined to have a low span and rigidity for the conversion lever. Can not be optimized in the original structure space;

4. The locking lever of the closing and tripping system is prone to failure after fatigue. Because the closing and tripping system adopts a three-stage linkage structure during the energy storage and closing process, the lock lever has only one fulcrum axis, and the lock lever, fulcrum axis and related parts are subject to excessive force and are easily damaged.

Summary of the invention

In order to solve the above technical problems, the present invention provides an operating mechanism of a circuit breaker, which realizes the reliability of the operating mechanism of the circuit breaker and improves the service life of the product.

In order to achieve the above-mentioned purpose of the invention, the operating mechanism of a circuit breaker provided by the present invention includes a pair of side plates, a rotating shaft assembly, a connecting rod assembly arranged between the pair of side plates, an energy storage lever assembly, a lock buckle assembly, and a spring. Components, camshafts, closing half shafts, opening half shafts and a pair of return springs, of which:

The rotating shaft assembly includes a rotating shaft and a cantilever fixed on the rotating shaft, both ends of the rotating shaft are respectively rotatably connected with the pair of side plates, so that the rotating shaft assembly is rotated on the pair of side plates;

The connecting rod assembly includes a first connecting rod, a second connecting rod, a switching lever, a switching connecting rod, and a double-pole lever. The other end of the first connecting rod is hinged with one end of the second connecting rod through a second shaft, The shaft sleeve one rotates on the second axis, the other end of the second link is hinged with one end of the conversion lever, the other end of the conversion lever is hinged with one end of the conversion link, and the conversion lever rotates around the conversion lever. The lever pivot axis rotates, the other end of the conversion link is hinged with the double-pole lever, the other end surface of the double-pole lever is in separable contact with the outer contour surface of the opening half shaft, the double-pole lever Rotating around the fulcrum shaft of the double-pole lever, after the half-shaft of the opening is rotated on the pair of side plates, one end of the double-pole lever can slide in the notch of the half-shaft of the opening;

The energy storage lever assembly includes a pair of energy storage lever plates, the energy storage lever assembly is rotated on the pair of side plates via a pair of shaft pins, and the fixed shaft of the energy storage lever assembly rotates with The shaft sleeve of the connecting rod assembly is in detachable contact, and the shaft sleeve is in detachable contact with the switching lever, so that the first connecting rod pushes the rotating shaft assembly to rotate;

The lock assembly includes a lever, a connecting rod, and a lock lever. One end of the lever of the lock assembly is hinged with one end of the connecting rod, the lever rotates around the lever pivot axis, and the other of the connecting rod One end is hinged to one end of the lock lever, the other end of the lock lever is in separable contact with the outer contour surface of the closing half shaft, and the lock lever is located on the fulcrum axis of the lock lever around the Rotating between a pair of side plates, after the closing half shaft rotates on the pair of side plates, the arc surface of the locking lever can slide in the notch of the closing half shaft; and

The camshaft includes a camshaft end axial surface that rotates between the pair of side plates, an outer contour of a cam plate, and a cam cantilever buckle surface. The outer contour of the cam plate is in rotational contact with the energy storage component so that the The energy storage lever assembly compresses the spring assembly, and a buckle surface of the cam cantilever makes detachable contact with the lock buckle component.

Further, the connecting rod assembly further includes a hinged connection with the cantilever of the rotating shaft assembly at one end of the first connecting rod.

Further, the energy storage lever assembly includes: a fixed shaft 5 and a fixed shaft 6 connecting the pair of the energy storage lever plates, a pair of bearings fixed on the outside of the energy storage lever plate, and a pair of bearings fixed on the outside of the energy storage lever plate. A pair of shaft pins 4 on the outer side of the energy storage lever plate, the energy storage lever assembly rotates on the pair of side plates by the pair of shaft pins 4, and the fixed shaft 5 of the energy storage lever assembly During the rotation, the shaft sleeve is in contact with the shaft sleeve of the connecting rod assembly, and the shaft sleeve is in separable contact with the outer end surface of the switching lever, so that the first connecting rod pushes the rotating shaft assembly to rotate, and the shaft sleeve is in contact with the outer end surface of the switching lever. The rotating shaft assembly pushes the separable contact of the circuit breaker to turn on or off.

Further, the locking assembly includes a shaft 6 fixed on the lever, a shaft sleeve 2 rotating on the shaft 6, and a locking lever fulcrum shaft and a lever fulcrum shaft rotating between the pair of side plates.

Further, the outer contour of the cam piece is in rotational contact with the bearing of the energy storage assembly, so that the energy storage lever assembly compresses the spring assembly, and a buckle surface of the cam cantilever is in contact with the lock buckle assembly. Two detachable contact sleeves.

Further, the spring assembly includes a spring support, a spring, and a spring seat, the spring support is in sliding contact with the spring seat, the spring is compressed between the spring support and the spring seat, and a support shaft is fixed on the spring support. On the pair of side plates, the spring seat is hingedly rotated on the support shaft, the spring bracket is in hinged rotation contact with the fixed shaft of the energy storage lever assembly, and the energy storage lever assembly can be compressed when rotated. And release the spring.

Still further, one end of the pair of opening springs is respectively fixed on both sides of the shaft one hinged between the cantilever of the rotating shaft assembly and the first connecting rod, and the other end is fixed on the pair of side plates, The rotating shaft assembly rotates to stretch and release the opening spring.

Further, it also includes a housing, and the pair of side plates are fixed on the housing.

The operating mechanism of the circuit breaker provided by the present invention achieves the following technical effects:

1. By changing the arrangement of the spring components, structurally adjust the impact position of the shaft of the energy storage lever component and the sleeve of the connecting rod component when the energy is released and closing, so as to improve the closing transmission ratio;

2. The fulcrum shaft of the switching lever of the opening and tripping system and the cam shaft of the energy storage system were split from the same shaft into two independent shafts, and the following problems were successfully solved:

(1) Aiming at the problem that the original conversion lever fulcrum shaft and the camshaft are fragile as a common shaft, the strength of the present invention is significantly improved after being changed to two independent shafts;

(2) In view of the problem that the closing storage capacity moment is larger than the opening storage capacity moment, when closing, the contact reaction force is transmitted to the fulcrum shaft of the conversion lever through the connecting rod assembly. Since the two shafts are independent, the cam will be stored during energy storage. The shaft will not be subjected to the reaction force transmitted by the contact system to ensure consistent closing and opening energy storage torque;

(3) Regarding the problem that the span of the conversion lever is too long, the rigidity is low, and the fatigue is easy to fail. After the present invention is changed to two independent shafts, the fulcrum shaft of the conversion lever can avoid the structure of the energy storage lever assembly and the camshaft. Movement space, so as to avoid the interference of the conversion lever fulcrum shaft with the energy storage lever assembly and the camshaft in the movement process, so the conversion lever can be designed to shorten the span, thereby increasing the rigidity, which can solve the fatigue failure problem and increase the service life of the part; as well as

3. As for the problem that the locking lever of the closing and tripping system is prone to failure after fatigue, the present invention combines the closing and tripping system with the original three-level link structure (energy storage lever assembly, cam assembly, locking lever ) Is changed to a five-stage connecting rod structure (energy storage lever assembly, camshaft, lever, connecting rod, lock lever), there are two fulcrum shafts in the lock assembly (lever fulcrum shaft and lock lever fulcrum shaft), spring force When passing the five-stage connecting rod to the locking lever of the locking assembly, the force is very small, which effectively improves the service life of the locking lever and other parts.

Description of the drawings

Fig. 1 is a schematic diagram of the assembly of the operating mechanism of the circuit breaker of the present invention.

Fig. 2 is a schematic diagram of the exploded structure of the operating mechanism of the circuit breaker of the present invention.

Fig. 3 is a schematic diagram of the open energy storage state of the operating mechanism of the circuit breaker of the present invention.

Fig. 4 is a schematic diagram of the discharging and closing state of the operating mechanism of the circuit breaker of the present invention.

Fig. 5 is a schematic diagram of the discharging and opening state of the operating mechanism of the circuit breaker of the present invention.

Fig. 6 is a schematic diagram of the structure of the rotating shaft assembly of the operating mechanism of the circuit breaker of the present invention.

Fig. 7 is a schematic structural view of the connecting rod assembly of the operating mechanism of the circuit breaker of the present invention.

Fig. 8 is a structural schematic diagram of the energy storage lever assembly of the operating mechanism of the circuit breaker of the present invention.

Fig. 9 is a schematic structural diagram of the locking assembly of the operating mechanism of the circuit breaker of the present invention.

Fig. 10 is a schematic structural view of the spring assembly of the operating mechanism of the circuit breaker of the present invention.

Fig. 11 is a schematic diagram of the spring support structure of the operating mechanism of the circuit breaker of the present invention.

Fig. 12 is a schematic diagram of the spring seat structure of the operating mechanism of the circuit breaker of the present invention.

Fig. 13 is a schematic diagram of the camshaft structure of the operating mechanism of the circuit breaker of the present invention.

Fig. 14 is a schematic diagram of the closing half shaft structure of the operating mechanism of the circuit breaker of the present invention.

Fig. 15 is a schematic diagram of the opening half-shaft structure of the operating mechanism of the circuit breaker of the present invention.

Description of reference signs:

1: side plate; 101: fixed shaft one; 102: fixed shaft two; 103: fixed shaft three; 104: fixed shaft four; 105: fixed block; 2: rotating shaft assembly; 201: rotating shaft; 202: cantilever; 3: connecting Rod assembly; 31: first connecting rod; 311: first connecting rod piece; 312: shaft pin one; 313: shaft one; 32: second connecting rod; 321: second connecting rod piece; 322: shaft pin two; 323: axis two; 324: sleeve one; 33: conversion lever; 331: conversion lever piece; 331a: outer contour surface of the conversion lever piece; 332: conversion lever fulcrum shaft; 333: axis three; 34: conversion connecting rod; 341: Conversion connecting rod piece; 342: Axis 4; 343: Axis 5; 35: Double-pole lever; 351: Double-pole lever; 351a: Double-pole lever surface; 351b: Double-pole lever arc surface; 352: Double-pole lever Fulcrum shaft; 353: shaft pin three; 4: energy storage lever assembly; 401: energy storage lever plate; 402: shaft pin four; 403: bearing; 404: fixed shaft five; 405: shaft pin five; 406: fixed shaft six ; 407: fixed shaft seven; 5: lock assembly; 51: lever; 511: lever plate; 512: lever fulcrum shaft; 513: shaft six; 514: shaft sleeve two; 515: shaft pin six; 52: connecting rod; 521: connecting rod piece; 522: axis seven; 523: axis eight; 53: locking lever; 531: locking lever plate; 531a: locking lever surface; 531b: locking lever arc surface; 532: locking lever fulcrum Shaft; 6: spring assembly; 61: spring support; 61a: spring support arc surface; 61b: spring support cylindrical surface; 61c: spring support guide hole surface; 62: spring; 63: spring seat; 63a: spring seat arc surface; 63b: spring seat cylindrical surface; 7: camshaft; 7a: camshaft end axial surface; 7b: cam sheet outer contour; 7c: camshaft cantilever one outer circle surface; 7d: camshaft cantilever one buckle surface; 7e: cam Shaft cantilever two; 8: closing half shaft; 8a: closing half shaft contour surface; 8b: closing half shaft notch; 8c: closing half shaft limit shaft; 9: opening half shaft; 9a: opening Outer contour surface of brake half shaft; 9b: opening half shaft notch; 9c: opening half shaft limit shaft; 10: opening spring; 11: hoop; 12: shift lever; 13; support shaft; 14: shell Body; 15: separable contacts.

Detailed ways

The operating mechanism of a circuit breaker of the present invention will be described in detail below with reference to the accompanying drawings.

1 and 2, the operating mechanism of a circuit breaker of the present invention includes a housing 14, a separable contact 15, a pair of side plates 1, a rotating shaft assembly 2, and a connection set between the pair of side plates 1. The lever assembly 3, the energy storage lever assembly 4, the locking assembly 5, the spring assembly 6, the camshaft 7, the closing half shaft 8, the opening half shaft 9 and a pair of opening springs 10.

Referring to Figure 3, Figure 4 and Figure 5, a pair of side plates 1 are fixedly connected by a fixed shaft 101, a fixed shaft 102, a fixed shaft 103, and a fixed shaft 104. A pair of fixed blocks 105 are respectively fixed on the pair of side plates. Inside of 1. A pair of side plates 1 is fixed on the housing 14 (see Figure 1), a pair of hoop 11 is fixed on the pair of side plates 1 (see Figure 2), the rotating shaft assembly 2 is between the pair of hoop 11 and the housing 14 When the rotating shaft assembly 2 rotates, the at least one pair of separable contacts 15 in the housing 14 can be turned on and off, and the circuit breaker can be turned on and off (see Figure 1).

Referring to FIGS. 6 and 7, in the embodiment of the present invention, the rotating shaft assembly 2 includes a rotating shaft 201 and a cantilever 202 fixed on the rotating shaft 201. The connecting rod assembly 3 includes a first connecting rod 31, a second connecting rod 32, a first connecting rod 31 and a cantilever 202 articulated shaft 313, a first connecting rod 31 and a second connecting rod 32 articulated shaft 323, on-axis A shaft sleeve 324 that rotates on the second 323, the conversion lever 33, the conversion lever fulcrum shaft 332 that rotates between a pair of side plates 1, the conversion link 34, the double-pole lever 35, the one that rotates between the pair of side plates 1 Double pole change lever support shaft 352.

The first connecting rod 31 is fixed by two first connecting rod pieces 311 through a pin one 312. One end of the two first connecting rod pieces 311 and the two cantilever arms 202 are hinged through a shaft one 313, and the second connecting rod 32 consists of two pieces. The second connecting rod piece 321 is fixed by the second shaft pin 322, the other end of the two first connecting rod pieces 311 and the one end of the two second connecting rod pieces 321 are hinged through the second shaft 323, and the first shaft sleeve 324 is on the second shaft 323. Rotate, the two second connecting rod pieces 321 are inside the two first connecting rod pieces 311, and the sleeve one 324 is inside the two second connecting rod pieces 321. The conversion lever 33 includes a conversion lever piece 331 and a conversion lever fulcrum shaft 332. The conversion lever fulcrum shaft 332 is fixed on the conversion lever piece 331, and the conversion lever fulcrum shaft 332 rotates on a pair of side plates 1. The other ends of the two second connecting rod pieces 321 and one end of the switching lever piece 331 are hinged through the third shaft 333, and the switching lever piece 331 is on the inner side of the two second connecting rods 321. The other end of the switching lever piece 331 and one end of the two switching link pieces 341 are hingedly connected by a shaft five 343. The double-pole lever 35 is fixed by two double-pole lever pieces 351 through pin three 353, the two double-pole lever pieces 351 rotate on the double-pole lever pivot shaft 352, and the double-pole lever pivot shaft 352 pivots on a pair of side plates 1 . The other end of the two conversion connecting rod pieces 341 and one end of the two double-pole lever pieces 351 are hingedly connected by a shaft 342. The surface 351a of the double-pole lever 35 can be detachably contacted with the outer contour surface 9a of the opening half shaft 9, and the limiting shaft 9c of the opening half shaft 9 can be detachably contacted with the features in the side plate 1. The double-pole lever 35 rotates around the double-pole lever fulcrum shaft 352. When the opening half shaft 9 rotates on a pair of side plates 1, the arc surface 351b of the double-pole lever 35 can slide in the notch 9b of the opening half shaft 9 (See Figure 15).

Referring to Fig. 8, in this embodiment, the energy storage lever assembly 4 includes a fixed shaft 5 404, a shaft pin 5 405, a fixed shaft 6 406, a fixed shaft 7 407, etc., which are connected to a pair of energy storage lever plates 401. , A pair of bearings 403 fixed on the outside of the energy storage lever plate 401, a pair of shaft pins 402 fixed on the outside of the energy storage lever plate, the energy storage lever assembly 4 is on a pair of sides through a pair of shaft pins 402 Rotate between the plates 1.

Referring to FIG. 9, the locking assembly 5 of the operating mechanism of the circuit breaker of the present invention includes a lever 51, a connecting rod 52, and a locking lever 53. The lever 51 is fixed by two lever plates 511 through a shaft pin 515. The two lever plates 511 rotate on the lever fulcrum shaft 512, and the lever fulcrum shaft 512 rotates on a pair of side plates 1. The shaft six 513 is fixed on the two lever plates 511, the shaft sleeve two 514 rotates on the shaft six 513, and the shaft sleeve two 514 is between the two lever plates 511. One end of the two lever pieces 511 and the two connecting rod pieces 521 are hinged through the shaft seven 522, and the two lever pieces 511 are outside the two connecting rod pieces 521. The lock lever 53 includes a lock lever piece 531 and a lock lever fulcrum shaft 532. The lock lever fulcrum shaft 532 is fixed on the lock lever piece 531, and the lock lever fulcrum shaft 532 rotates on a pair of side plates 1. The other end of the two connecting rod pieces 521 and one end of the locking lever piece 531 are hingedly connected by an eighth axis 523. The surface 531a of the locking lever 53 can be detachably contacted with the outer contour surface 8a of the closing half shaft 8, and the limiting shaft 8c of the closing half shaft 8 can be detachably contacted with features in the side plate 1. The lock lever 53 rotates around the lock lever fulcrum shaft 532. When the closing half shaft 8 rotates on the pair of side plates 1, the arc surface 531b of the lock lever 53 can slide in the notch 8b of the closing half shaft 8. (See Figure 14).

As shown in Fig. 13, the camshaft 7 includes a camshaft end axial surface 7a that rotates between a pair of side plates 1, a cam sheet outer contour 7b, a cam cantilever an outer circular surface 7c, a cam cantilever a buckle surface 7d, a cam Cantilever two 7e. The two end axial surfaces 7a of the camshaft 7 rotate on a pair of side plates.

Referring to FIGS. 3, 10, 11 and 12, the spring assembly 6 includes a spring support 61, a spring 62, and a spring seat 63. The spring support guide hole surface 61c of the spring support 61 is in sliding contact with the cylindrical surface 63b of the spring seat 63, the spring 62 is compressed or released between the spring support 61 and the spring seat 63, and the cylindrical surface 61b of the spring support 61 is in contact with the inner diameter of the spring 62 Play a guiding role. The support shaft 13 is fixed on the pair of side plates 1, the arc surface 63a of the spring seat 63 is hingedly rotated with the support shaft 13, and the arc surface 61a of the spring bracket 61 is hingedly rotated with the fixed shaft 406 of the energy storage lever assembly 4 to store energy The rotation of the lever assembly 4 can compress and release the spring 62.

3, 4, and 5, one end of a pair of opening springs 10 are respectively fixed on both sides of a shaft 313 of the cantilever 202 of the rotating shaft assembly 2 and the first connecting rod 31, and the other end is fixed to a pair of side plates 1. On the upper side, the rotating shaft assembly 2 can stretch the opening spring 10 by rotating.

Fig. 5 shows the discharging and opening state of the operating mechanism of the circuit breaker of the present invention. The energy storage process of the operating mechanism is: when the camshaft 7 rotates clockwise, the outer contours of a pair of cam pieces 7b contact a pair of bearings 403 of the energy storage lever assembly 4, and the energy storage lever assembly 4 is driven to rotate counterclockwise to store energy The fixed shaft 406 of the lever assembly 4 is hingedly rotated with the arc surface 61 a of the spring bracket 61 of the spring assembly 6, and the spring bracket 61 compresses the spring 62. At the same time, the cam cantilever outer surface 7c of the camshaft 7 is in contact with the second sleeve 514 of the lock assembly 5. When the camshaft 7 rotates clockwise, the cam cantilever outer surface 7c and the second sleeve 514 of the lock assembly 5 are in contact with each other. At the same time, under the action of the counterclockwise spring return force of the locking assembly 5, the locking lever piece 531 contacts the fixed shaft 103, and the surface 531a of the locking lever piece is above the outer contour surface 8a of the closing half shaft 8. When the camshaft 7 continues to rotate clockwise, the cam cantilever buckle surface 7d of the camshaft 7 is in contact with the second sleeve 514 of the lock assembly 5, and the camshaft 7 stops rotating. Under the force of the spring 62, the lock assembly 5 The locking surface 531a of the switch contacts the outer contour surface 8a of the closing half shaft 8 (see Fig. 2 and Fig. 14). At the same time, under the action of the counterclockwise spring return force of the connecting rod assembly 3, the double-pole lever 35 is in contact with the fixed shaft 101, and the surface 351a of the double-pole lever is below the outer contour surface 9a of the opening half shaft 9. 3 constitutes the folded state shown in Figure 3, and the operating mechanism has completed its energy storage state.

Fig. 3 shows the opening and charging state of the operating mechanism of the circuit breaker of the present invention. The closing process of the operating mechanism is: when the closing half shaft 8 rotates counterclockwise, the locking arc 531b of the locking assembly 5 slides into the notch 8b of the closing half shaft 8, the locking assembly 5 is folded, and the camshaft The cam cantilever one buckle surface 7d of 7 is separated from the second sleeve 514 of the lock assembly 5, and the camshaft 7 rotates clockwise. At the same time, the second cam cantilever 7e of the camshaft 7 is in contact with the lever 12 rotating on the side plate to prevent the cam from being released. Can overshoot. At the same time, the bearing 403 of the energy storage lever assembly 4 is separated from the outer contour surface 7c of the cam sheet of the camshaft 7 (see Figures 2 and 13), and the spring assembly 6 is released to drive the energy storage lever assembly 4 to rotate clockwise, and the energy storage lever assembly 4 is fixed The fifth shaft 404 hits the sleeve one 324 of the connecting rod assembly 3. The surface 351a of the double-pole lever 35 is in contact with the outer contour surface 9a of the opening half shaft 9 (see Figures 2 and 15), and the first connecting rod assembly 3 The rod 31 and the second connecting rod 32 rotate clockwise around the third axis 333, the first connecting rod 31 drives the cantilever 202 of the rotating shaft assembly 2 to rotate counterclockwise through the axis one 313, and the cantilever 202 rotates and stretches the opening spring 10. After the two ends of the shaft pin 405 of the energy storage lever assembly 4 contact a pair of fixed blocks 105 fixed on the pair of side plates 1, the energy storage lever assembly 4 stops rotating, and the shaft sleeve 324 of the connecting rod assembly 3 and the conversion lever The outer contour surface 331a of the sheet stops rotating after contacting, the connecting rod assembly 3 forms the folded state shown in FIG. 4, and the closing state of the operating mechanism is completed.

Fig. 4 shows the discharging and closing state of the operating mechanism of the circuit breaker of the present invention. The opening process of the operating mechanism is: when the opening half shaft 9 rotates clockwise, the double-pole lever arc surface 351b of the connecting rod assembly 3 slides into the notch 9b of the opening half shaft 9, and the shaft 333 turns around the switch lever fulcrum. After the shaft 332 rotates counterclockwise and the connecting rod assembly 3 is folded, the cantilever 202 is actuated by the reset force of the opening spring 10, and the rotating shaft assembly 2 rotates clockwise. The cantilever 202 stops rotating after contacting the fixed shaft 104, and the connecting rod assembly 3 The shaft sleeve one 324 contacts the shaft pin five 405 of the energy storage lever assembly 4, and the connecting rod assembly 3 forms the folded state shown in FIG. 5, and the opening state of the operating mechanism is completed.

Through the above description, those skilled in the art can see that, by providing a unique structure, the present invention fundamentally solves the improper impact position of the prior art, which causes the impacted parts to fatigue easily, reduces the service life, and is more reliable. Poor technical problems, because the reliability of the circuit breaker is a guarantee for the safe and reliable operation of the product, thus achieving significant technical effects, which are specifically manifested in:

1. By changing the arrangement of the spring assembly 6, structurally adjust the impact position of the shaft 404 of the energy storage lever assembly and the sleeve 324 of the connecting rod assembly when the energy is released and closing, so as to improve the closing transmission ratio;

2. Split the fulcrum shaft 332 of the switching lever of the opening and tripping system and the camshaft 7a of the energy storage system from the same shaft into two independent shafts, successfully solving the following problems:

(1) The problem that the original switch lever fulcrum shaft 332 and the camshaft 7a share a common shaft is overcome. The strength is significantly improved after changing to two independent shafts;

(2) Solve the problem that the closing storage capacity moment is larger than the opening storage capacity moment. When closing, the contact reaction force is transmitted to the switching lever fulcrum shaft 332 through the connecting rod assembly 3. Since the two shafts are independent, the camshaft 7a will not receive the reaction force transmitted by the contact system 15 during energy storage. Therefore, ensure that the closing and opening energy storage torques are consistent;

(3) The problem that the conversion lever is too long and has low rigidity, and is easy to fail when fatigue is stressed. After changing to two independent shafts, the switch lever fulcrum shaft 332 can avoid the movement space of the energy storage lever assembly 4 and the camshaft 7 in structure, so the design of the switch lever 331 can shorten the span, thereby increasing the rigidity, which can solve the problem. Fatigue failure problems, increasing the service life of the part; and

3. Solve the problem that the locking lever of the closing and tripping system is prone to failure after fatigue. The present invention changes the closing and tripping system from the original three-level connecting rod structure (energy storage lever assembly, cam assembly, and locking lever) to a five-level connecting rod structure (energy storage lever assembly 4, camshaft 7, lever 51). , Connecting rod 52, lock lever 53), there are two fulcrum shafts in the lock assembly 5 (lever fulcrum shaft 512 and lock lever fulcrum shaft 532), the spring force 62 is transferred to the lock assembly 5 through the five-stage connecting rod When the locking lever 53 is locked, the force is very small, which effectively increases the service life of the locking lever 53 and other parts. 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

An operating mechanism of a circuit breaker, characterized in that it includes a pair of side plates (1), a rotating shaft assembly (2), a connecting rod assembly (3) arranged between the pair of side plates (1), and an energy storage The lever assembly (4), the lock assembly (5), the spring assembly (6), the camshaft (7), the closing half shaft (8), the opening half shaft (9) and a pair of return springs (10), among them :

The rotating shaft assembly (2) includes a rotating shaft (201) and a cantilever (202) fixed on the rotating shaft (201). Two ends of the rotating shaft (201) are respectively rotatably connected with the pair of side plates (1), So that the rotating shaft assembly (2) rotates on a pair of side plates (1);

The connecting rod assembly (3) includes a first connecting rod (31), a second connecting rod (32), a switching lever (33), a switching connecting rod (34), and a double-pole lever (35). The other end of the rod (31) is hinged with one end of the second connecting rod (32) through the second shaft (323), the first shaft sleeve (324) rotates on the second shaft (323), and the second connecting rod (32) The other end of) is hinged with one end of the conversion lever (33), the other end of the conversion lever (33) is hinged with one end of the conversion link (34), and the conversion lever (32) surrounds the fulcrum of the conversion lever The shaft (332) rotates, the other end of the conversion link (34) is hinged with the double-pole lever (35), and the other end surface (351a) of the double-pole lever (35) is connected to the opening semi-shaft ( 9) the outer contour surface (9a) can be detachably contacted, the double-pole lever (35) rotates around the double-pole lever fulcrum shaft (352), on the opening half shaft (9), on the pair of sides After the plate (1) is rotated, one end of the double-pole lever (35) can slide in the notch (9b) of the opening semi-shaft (9);

The energy storage lever assembly (4) includes a pair of energy storage lever plates (401), the energy storage lever assembly (4) is rotated on the pair of side plates (1) through a pair of shaft pins (402) , The fixed shaft five (404) of the energy storage lever assembly (4) is in detachable contact with the shaft sleeve one (324) of the connecting rod assembly (3) during rotation, and the shaft sleeve one (324) is in contact with the shaft sleeve one (324) of the connecting rod assembly (3) during rotation. The switch lever (33) is detachably contacted, so that the first connecting rod (31) pushes the rotating shaft assembly (2) to rotate;

The lock assembly (5) includes a lever (51), a connecting rod (52), and a lock lever (53). One end of the lever (51) of the lock assembly (5) is connected to the connecting rod ( 52) is hinged at one end, the lever (51) rotates around the lever pivot axis (512), the other end of the connecting rod (52) is hinged with one end of the lock lever 53, the lock lever (53) The other end surface (531a) of the closing shaft 8 is in separable contact with the outer contour surface (8a) of the closing half shaft 8, and the locking lever (53) surrounds the locking lever fulcrum axis (532) on the pair of sides After rotating between the plates (1), after the closing half-shaft (8) rotates on the pair of side plates (1), the arc surface (531b) of the locking lever (53) can be Sliding in the notch (8b) of the closing axle (8); and

The camshaft (7) includes a camshaft end axial surface (7a), a cam sheet outer contour (7b) and a cam cantilever buckle surface (7d) that rotates between the pair of side plates (1), so The outer contour of the cam piece (7b) is in rotational contact with the energy storage assembly (4) so that the energy storage lever assembly (4) compresses the spring assembly (6), and a buckle surface (7d) of the cam cantilever is in contact with the energy storage assembly (4). The lock assembly (5) makes detachable contact.
The operating mechanism of a circuit breaker according to claim 1, characterized in that, the connecting rod assembly (3) further comprises a connection between one end of the first connecting rod (31) and the rotating shaft assembly (2). The cantilever (202) is hinged.
The operating mechanism of a circuit breaker according to claim 1, wherein the energy storage lever assembly (4) further comprises a fixed shaft (404) connected to the pair of the energy storage lever plates (401). ), fixed shaft six (406), a pair of bearings (403) fixed on the outside of the energy storage lever plate (401), and a pair of shaft pins fixed on the outside of the energy storage lever plate (401) Four (402), the energy storage lever assembly (4) rotates on the pair of side plates (1) through the pair of axle pins (402), the energy storage lever assembly (4) The fixed shaft five 404 is in contact with the shaft sleeve one (324) of the connecting rod assembly (3) during rotation, and the shaft sleeve one (324) is separable from the outer end surface (331a) of the conversion lever (33) The first connecting rod (31) pushes the rotating shaft assembly (2) to rotate, and the rotating shaft assembly (2) pushes the separable contact (15) of the circuit breaker to turn on or off.
The operating mechanism of a circuit breaker according to claim 1, wherein the locking assembly (5) further comprises a shaft six (513) fixed on the lever (51) and a shaft six (513) fixed on the lever (51). ) The second shaft sleeve (514) that rotates upward, and the locking lever fulcrum shaft (532) and the lever fulcrum shaft (512) that rotate between the pair of side plates (1).
The operating mechanism of a circuit breaker according to claim 4, characterized in that the outer contour (7b) of the cam piece is in rotational contact with the bearing (403) of the energy storage assembly (4), so that the The energy storage lever assembly (4) compresses the spring assembly (6), and a buckle surface (7d) of the cam cantilever is in separable contact with the second shaft sleeve (514) of the lock component (5).
The operating mechanism of a circuit breaker according to claim 3, wherein the spring assembly (6) comprises a spring support (61), a spring (62) and a spring seat (63), and the spring support (61) ) Is in sliding contact with the spring seat (63), the spring (62) is compressed between the spring support (1) and the spring seat (63), and a supporting shaft (13) is fixed on the pair of On the side plate (1), the spring seat (63) is hingedly rotated on the support shaft (13), and the spring bracket (61) is connected to the fixed shaft (6) of the energy storage lever assembly (4). 406) The hinged rotation contact, the rotation of the energy storage lever assembly (4) can compress and release the spring (62).
The operating mechanism of a circuit breaker according to claim 1, wherein one ends of the pair of opening springs (10) are respectively fixed on the cantilever (202) and the cantilever (202) of the rotating shaft assembly (2). The first connecting rod (31) is hinged on both sides of a shaft (313), and the other end is fixed on the pair of side plates (1), and the rotating shaft assembly (2) rotates to stretch and release the opening Spring (10).
The operating mechanism of a circuit breaker according to claim 1, further comprising a housing (14), and the pair of side plates (1) are fixed on the housing (14).