CN224123304U - Plastic shell type circuit breaker - Google Patents

Abstract

The utility model provides a moulded case circuit breaker, includes operating device, contact mechanism and interlocking device, operating handle passes through operating device and drives the moving contact and remove, interlocking device includes interlock and interlocking spring, and interlocking spring is used for driving the interlock and locks the moving contact in the state that can't contact with the static contact, operating handle is from the in-process of separating brake position to closing position, and when operating handle moved to the interlocking position, operating handle or operating device drive interlock release the locking to the moving contact, drive operating handle through the energy storage spring and remove to separating brake position and closing position, under the condition that operating device has not closed a floodgate in place, can avoid moving contact and static contact to switch on earlier, can help the operator to judge the operating condition of product, avoid producing misjudgement, reduce the potential safety hazard, and operating handle moves to the action position when the closing force of energy storage spring is bigger, can drive the moving contact and the static contact fast, realizes quick closing function.

Description

Plastic shell type circuit breaker

Technical Field

The utility model relates to the field of piezoelectric devices, in particular to a molded case circuit breaker.

Background

A plastic shell breaker is mainly used in a power distribution circuit and a motor circuit with high voltage and large current short-circuit current for switching on, switching off and carrying current under normal working conditions, and can cut off the current under the conditions of overload, circuit breaking, undervoltage and grounding faults of circuits and electric equipment, and can also be used for the infrequent starting of a motor

Most of the existing molded case circuit breakers are in an atmospheric environment, arc extinction is achieved through a metal grid arc extinguishing chamber, and in the closing process of the circuit breaker, after a rocker arm drives a main tension spring to pass through a dead point position, an upper connecting rod turns over to drive a lower connecting rod, and the lower connecting rod drives a rotating shaft assembly to rotate, so that the moving contact and the fixed contact are closed. For the vacuum molded case circuit breaker of the current design, the movable contact and the grid-type arc-extinguishing chamber are replaced by the vacuum arc-extinguishing chamber, the vacuum arc-extinguishing chamber uses high vacuum as insulation and arc-extinguishing medium, the operating mechanism controls the rotating shaft to rotate, and the rotating shaft drives the movable contact guide rod, so that the movable contact and the fixed contact are controlled to be closed and opened in the vacuum arc-extinguishing chamber.

The vacuum arc-extinguishing chamber is in relative vacuum, and the movable contact guide rod is acted by external atmospheric pressure, so that the movable contact and the fixed contact in the vacuum arc-extinguishing chamber are closed in a natural state. When the vacuum interrupter is installed in the molded case circuit breaker, under the tripping state, the movable guide rod of the vacuum interrupter is subjected to the lifting force of the operating mechanism through the rotating shaft, so that the atmospheric pressure is overcome, and the movable contact and the fixed contact are separated.

Due to the existence of the partial atmospheric pressure, the movable guide rod is always acted by the atmospheric pressure for closing the circuit breaker in the closing process of the circuit breaker. In the switching-on process of the circuit breaker, the lifting force of the mechanism on the moving guide rod switching-off is gradually reduced, the lifting force of the mechanism on the moving guide rod switching-off is smaller than the switching-on force applied to the moving guide rod by atmospheric pressure before the rocker arm drives the energy storage spring to pass through the dead point position, so that the moving guide rod moves towards the switching-on direction, the moving contact in the vacuum arc-extinguishing chamber is closed, the main tension spring force is not converted into the switching-on force from the switching-on force, the moving contact is closed, the contact pressure is insufficient, and when a large current passes between the contacts, the moving contact is subjected to electric repulsive force to generate jumping, so that the contact fusion welding is easy to be caused. In addition, under the condition that the mechanism is not closed in place, the product is already conducted, misleading can be generated for an operator to judge the state of the product, and potential safety hazards exist.

Disclosure of utility model

The utility model aims to overcome at least one defect in the prior art and provides a molded case circuit breaker.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

The molded case circuit breaker comprises an operating mechanism and a contact mechanism, wherein the contact mechanism comprises a moving contact and a fixed contact, an operating handle is connected with the operating mechanism, the operating mechanism is connected with the moving contact, the operating handle can move among a breaking position, an action position and a closing position, the action position is positioned between the breaking position and the closing position, an energy storage spring can be driven to rotate when the operating handle moves from one of the breaking position and the closing position to the action position, the energy storage spring is driven to pass through a dead point position when the operating handle moves to the action position, a component force applied to the moving direction of the operating handle by the energy storage spring is changed into a thrust force from resistance after passing through the dead point position, the operating handle is driven to move to the other one of the breaking position and the closing position through the energy storage spring, the operating handle is driven to separate the moving contact from the fixed contact when the operating handle moves to the closing position,

The movable contact is locked in a state that the movable contact cannot be contacted with the fixed contact by the interlocking mechanism, the interlocking mechanism comprises an interlocking piece and an interlocking spring, the interlocking spring is used for driving the interlocking piece to lock the movable contact in a state that the movable contact cannot be contacted with the fixed contact, when the operating handle moves to the interlocking position from the opening position to the closing position, the operating handle or the operating mechanism drives the interlocking piece to unlock the movable contact, and the interlocking position coincides with the action position or is located between the action position and the closing position.

Preferably, the contact mechanism comprises a vacuum arc-extinguishing chamber, the vacuum arc-extinguishing chamber comprises a vacuum tube, a movable guide rod and a static guide rod, the movable contact and the static contact are respectively arranged in the vacuum tube, one ends of the movable guide rod and the static guide rod, which are positioned in the vacuum tube, are respectively connected with the movable contact and the static contact, and the operating mechanism is connected with the movable guide rod.

Preferably, the movable guide rod is fixedly connected with the guide plate, the interlocking spring drives the interlocking piece to lock the guide plate so as to lock the movable contact in a state that the movable contact cannot be contacted with the fixed contact, and when the operating handle moves to the interlocking position, the operating handle or the operating mechanism drives the interlocking piece to overcome the acting force of the interlocking spring to release the limit of the guide plate.

Preferably, the interlocking mechanism further comprises an interlocking rod, the interlocking spring is connected with the interlocking rod, the interlocking rod is provided with a driven part matched with the operating mechanism and a driving part matched with the interlocking piece, the interlocking spring is used for driving the interlocking rod to rotate, the interlocking rod drives the interlocking piece to limit the guide plate through the driving part, the operating mechanism drives the interlocking rod to rotate through the driven part, and the driving part overcomes the action of the interlocking spring to drive the interlocking piece to be far away from the guide plate.

Preferably, the operating mechanism comprises a bracket, a connecting rod mechanism and a rocker arm, wherein the connecting rod mechanism and the rocker arm are respectively arranged on the bracket, the rocker arm comprises two swing arms respectively connected with the bracket in a rotating way and a connecting arm connected between the two swing arms, the connecting arm is connected with an energy storage spring, an operating handle is connected with the connecting arm, and when the operating handle moves to an interlocking position, the rocker arm pushes the driven part to drive the interlocking rod to rotate, so that the driving part overcomes the action of the interlocking spring to drive the interlocking piece to be far away from the guide plate.

Preferably, the two swing arms of the rocker arm are respectively provided with a trigger part, the driven part comprises two push plates which are respectively arranged corresponding to the two swing arms of the operating mechanism, and the operating handle moves to the interlocking position.

Preferably, the link mechanism comprises a transmission part and a jump buckle which are rotationally connected, and a lock catch for locking the jump buckle, wherein the transmission part, the jump buckle and the lock catch are respectively rotationally arranged on the support, a driving shaft is arranged on the transmission part, the driving shaft is connected with a connecting arm of the rocker arm through an energy storage spring, the lock catch can lock the jump buckle, a link shaft connected between the transmission part and the jump buckle is used as a rotation center of the driving shaft, and the driving shaft is connected with the guide plate.

Preferably, the driving shaft is provided with a rotatable operation connecting rod, the operation connecting rod is rotationally connected with the driving connecting rod, the driving connecting rod is connected with the rotating shaft mechanism, the rotating shaft mechanism is rotationally arranged, the guide plate is connected with the rotating shaft mechanism through the guide connecting rod, and the guide plate is connected with the movable wiring structure through flexible connection.

Preferably, the device further comprises a rotating shaft mechanism, wherein the rotating shaft mechanism comprises a rotating seat which is rotatably arranged, the rotating seat is provided with a rotating shaft connecting rod, and the guide plate is connected with the rotating shaft connecting rod through a guide connecting rod.

Preferably, the interlocking piece includes interlocking locking part to and two interlocking sliding parts that are connected with interlocking locking part respectively, the interval sets up between two interlocking sliding parts, is equipped with the interlocking drive shaft between two interlocking sliding parts, and the interlocking drive shaft is connected between two interlocking sliding parts, is equipped with the third between interlocking drive shaft and interlocking locking part and dodges the groove, the drive part is equipped with the drive slot including two drive plates of relative setting between two drive plates, and the drive slot is used for the cover to dodge the groove from the third and passes the interlocking piece after being connected with the interlocking spring at the interlocking drive shaft that the interlocking piece was gone up to the drive slot.

Preferably, be equipped with the interlocking seat in the casing, the middle part of interlocking seat is equipped with the interlocking groove, the movable setting of interlocking piece is in the interlocking groove and along interlocking groove rectilinear movement, the interlocking seat includes two fixed curb plates that set up relatively, and two fixed curb plates include the first side and the second side of relative setting respectively to and connect the third side between first side and second side, enclose into the spout of U type between the first side of every fixed curb plate, second side and the third side, the third side of two fixed curb plates sets up relatively, the spout of two fixed curb plates sets up and forms the first groove of dodging that is used for passing the deflector with the both sides sliding fit of interlocking piece respectively, is equipped with fixed roof between the bottom of the first side of two fixed curb plates, and the interval sets up and forms the second groove of dodging between the top of the second side of two fixed plates, be equipped with the first spring plate that passes the second and dodge the groove, be equipped with the second spring plate on the fixed roof, the both ends of spring are equipped with the connecting hole on the spring plate with the first spring coupling hole and the second spring plate respectively.

Preferably, the guide plate comprises a guide connecting part connected with the movable guide rod and a guide interlocking part connected with the guide connecting part, the interlocking piece comprises an interlocking locking part, the interlocking locking part of the interlocking piece is positioned on a path of the guide interlocking part, which moves along with the movable contact close to the fixed contact, so that the movable contact is locked in a state of being incapable of being contacted with the fixed contact, and the interlocking piece moves so that the interlocking locking part is prevented from being locked by the guide interlocking part.

Preferably, the guiding connection part is arranged perpendicular to the guiding interlocking part, the guiding interlocking part is parallel to the moving direction of the moving contact, and the guiding connection part is perpendicular to the moving direction of the moving contact.

Preferably, the movable contact comprises a plurality of phase pole units which are arranged side by side, a plurality of interlocking pieces are correspondingly arranged to lock the movable contacts of the plurality of phase pole units in one-to-one correspondence, the interlocking rod traverses the plurality of phase pole units, a plurality of driving parts which are respectively corresponding to the plurality of phase pole units are arranged on the interlocking rod, and the interlocking rod is used for driving the interlocking pieces of the plurality of phase pole units to move through the interlocking rod.

According to the molded case circuit breaker, under the condition that an operating mechanism is not switched on in place, the moving contact and the fixed contact can be prevented from being conducted first, an operator can be helped to judge the working state of a product, misjudgment is avoided, potential safety hazards are reduced, and when an operating handle moves to an action position, the switching-on force of an energy storage spring is larger, the moving contact can be driven to be in contact with the fixed contact quickly, a quick switching-on function is realized, sufficient contact pressure is ensured between the moving contact and the fixed contact, and the phenomenon that the moving contact is easy to cause fusion welding between the contacts due to jumping caused by electric repulsive force is avoided.

In addition, the contact mechanism is a vacuum arc-extinguishing chamber, the vacuum environment of the vacuum arc-extinguishing chamber can be rapidly diffused and extinguished, the breaking short-circuit current capacity is obviously higher than that of the traditional arc-extinguishing mode in air, better arc-extinguishing performance can be achieved, the ablation of a moving contact and a fixed contact can be reduced in the vacuum environment, and the mechanical life can be obviously prolonged. In addition, the vacuum arc-extinguishing chamber can not generate particles or high-temperature gas during arc extinction, and other switching appliances can be prevented from being influenced.

In addition, before the operation handle reaches the interlocking position, the movable contact is locked in a state that the movable contact cannot be contacted with the fixed contact through the interlocking mechanism, so that the movable contact is prevented from being contacted with the fixed contact in advance under the influence of atmospheric pressure or other factors.

In addition, the guide plate not only plays a role in connecting the movable guide rod with the rotating shaft mechanism and electrically connecting the movable guide rod with the movable wiring structure, but also plays a role in locking the movable contact in cooperation with the interlocking piece.

Drawings

Fig. 1 is a schematic structural view of a molded case circuit breaker of the present utility model;

fig. 2 is an analytical sectional view of the molded case circuit breaker of the present utility model in a opened state;

fig. 3 is an analytical cross-sectional view of the plastic shell type circuit breaker of the present utility model during closing;

FIG. 4 is a schematic view of the structure of the interlock mechanism of the present utility model;

FIG. 5 is an enlarged view of a portion of FIG. 4 in accordance with the present utility model;

FIG. 6 is a schematic view of the structure of the interlock lever of the present utility model;

FIG. 7 is a schematic view of the structure of an interlock of the present utility model;

FIG. 8 is an exploded view of the interlock mechanism of the present utility model;

FIG. 9 is an enlarged view of a portion of FIG. 8 in accordance with the present utility model;

FIG. 10 is a schematic structural view of an operating mechanism;

In the figure:

1 operating mechanism 19 link shaft

2-Phase pole unit 21 partition board

3 Vacuum interrupter 22 mounting panel

4 Interlocking piece 23 mounting groove

5 Interlocking spring 31 vacuum tube

6 Guide plate 32 movable guide rod

7 Interlocking rod 33 static guide rod

8 Interlocking seat 34 moving contact

9 Spindle mechanism 35 static contact

11 Rocker arm 36 static wiring structure

12 Operating handle 37 movable wiring structure

13 Drive 41 interlocking lock

14 Jump button 42 interlocking sliding part

15 Lock catch 43 interlocking driving shaft

16 Drive shaft 44 third avoidance groove

17 Energy storage spring 45 interlocking protruding part

46 Interlocking sliding surface 85 first avoiding groove

61 Guide connection 86 fixed roof

62 Guide interlocking part 87 second avoiding groove

63 Guide link 88 second spring plate

71 Driven part 91 rotary seat

72 Drive section 92 drives the link

73 Push plate 93 spindle connecting rod

74 Drive plate 94 closing drive plate

75 Drive groove 95 brake separating driving part

76 First spring plate 96 contact spring

77 Baffle 102 rebuckles

81 First side 110 trigger

82 Second side 111 swing arm

83 Third side 112 connecting arm

84 Chute 161 operating link

Detailed Description

The following examples are given in connection with the accompanying drawings to further illustrate embodiments of the molded case circuit breaker of the present utility model. The molded case circuit breaker of the present utility model is not limited to the description of the following embodiments.

As shown in fig. 1-3, the molded case circuit breaker of the present embodiment includes an operation mechanism 1 and at least one phase pole unit 2, the phase pole unit 2 includes a static wiring structure 36, a contact mechanism, a moving wiring structure 37, a rotating shaft mechanism and a protection mechanism, the contact mechanism includes a moving contact 34 and a static contact 35, the operation handle 12 is connected with the operation mechanism 1, the operation mechanism 1 is connected with the moving contact 34, the operation mechanism 1 drives the moving contact 34 to contact with and separate from the static contact 35, the protection mechanism is used for triggering the operation mechanism 1 to drive the moving contact 34 to separate from the static contact 35, the static wiring structure 36 and the moving wiring structure 37 serve as an inlet terminal and an outlet terminal respectively for connecting a power source and a load, and the static wiring structure 36 and the moving wiring structure 37 are electrically connected with the static contact 35 and the moving contact 34 respectively.

As shown in fig. 10, the operating mechanism 1 includes a bracket, a link mechanism and a rocker arm, which are respectively disposed on the bracket, the rocker arm is connected with the operating handle 12, the rocker arm includes two swing arms 111 disposed opposite to each other and a connecting arm 112 connected between the two swing arms 111, the connecting arm 112 is connected with the operating handle 12, the link mechanism includes a transmission member 13 and a trip button 14 which are rotatably connected, and a lock catch 15 for locking the trip button 14, the transmission member 13, the trip button 14 and the lock catch 15 are respectively rotatably disposed on the bracket, a driving shaft 16 is disposed on the transmission member 13, the driving shaft 16 is connected with the connecting arm 112 of the rocker arm through an energy storage spring 17, the lock catch 15 can lock the trip button 14, a link shaft 19 connected between the transmission member 13 and the trip button 14 is used as a rotation center of the driving shaft 16, and the driving shaft 16 is connected with the moving contact 34 through a plurality of links;

The operating handle 12 can move between a brake opening position, an operating position and a brake closing position, the operating position is located between the brake opening position and the brake closing position, the operating handle 12 can drive the energy storage spring 17 to rotate when moving from one of the brake opening position and the brake closing position to the operating position, the energy storage spring 17 is driven to pass through a dead point position when moving to the operating position, a component force applied to the moving direction of the operating handle 12 by the energy storage spring 17 is changed into a thrust force from resistance after passing through the dead point position, the operating handle 12 is driven to move to the other of the brake opening position and the brake closing position through the energy storage spring 17, the moving contact 34 is driven to be separated from the fixed contact 35 when the operating handle 12 moves to the brake opening position, and the moving contact 34 is driven to be contacted with the fixed contact 35 when the operating handle 12 moves to the brake closing position, which is the prior art in the field.

In this embodiment, the driving shaft 16 is provided with a rotatable operating link 161, the operating link 161 is rotationally connected with the driving link 92, the driving link 92 is connected with the rotating shaft mechanism 9, and the rotating shaft mechanism 9 is contacted with and separated from the fixed contact 35 through the driving moving contact 34. Of course, as other embodiments, the drive shaft 16 may drive the movable contact 34 in other manners.

As shown in fig. 4, a modification point of this embodiment is that the device further includes an interlocking mechanism, where the interlocking mechanism includes an interlocking member 4 and an interlocking spring 5, where the interlocking spring 5 is used to drive the interlocking member 4 to lock the moving contact 34 in a state that the moving contact 35 cannot be contacted, and in the process of moving the operating handle 12 from the opening position to the closing position, when the operating handle 12 moves to the interlocking position, the operating handle 12 or the operating mechanism 1 drives the interlocking member 4 to unlock the moving contact 34, so that the moving contact 34 can contact the moving contact 35 under the drive of releasing energy of the energy storage spring 17, and the interlocking position coincides with the operating position or is located between the operating position and the closing position.

The molded case circuit breaker of this embodiment can avoid moving contact 34 and static contact 35 leading to lead under the condition that operating device 1 has not closed in place yet, can help the operator to judge the operating condition of product, avoid producing erroneous judgement, reduce the potential safety hazard, when operating handle 12 moves to the action position moreover, the closing force of energy storage spring 17 is bigger, can drive moving contact 34 and static contact 35 contact fast, realize quick switching-on function, and guarantee to form sufficient contact pressure between moving contact 34 and the static contact 35, avoid moving contact 34 to produce because receiving electronic repulsion and beat and arouse the contact to melt and weld easily.

The contact mechanism of this embodiment includes the vacuum interrupter 3, the vacuum interrupter 3 includes the vacuum tube 31, the movable guide arm 32 and the static guide arm 33, the vacuum tube 31 internal environment is the vacuum, the movable contact arm 34 and the static guide arm 35 are set up in the vacuum tube 31 respectively, one end that the movable guide arm 32 and the static guide arm 33 are located in the vacuum tube 31 is with the movable contact arm 34 and the static guide arm 35 respectively in the connection diagram simplifying the shape of movable contact arm 34 and the static contact arm 35, the terminal surface of the movable guide arm 32 is simplified to the line segment and represents the movable contact arm 34, and the terminal surface of the static guide arm 33 is simplified to the line segment and represents the static contact arm 35, the movable contact arm 34 and the static contact arm 35 usually have certain volume, the movable contact arm 34 and the static contact arm 35 that fig. 3 shows are not coincident, but the movable contact arm 34 and the static contact arm 35 are connected, the actuating mechanism 1 is connected with the movable guide arm 32, the actuating shaft 16 of actuating mechanism 1 in this embodiment drives the movable guide arm 32 through the pivot mechanism 9 and makes the movable guide arm 32 drive the movable contact arm 34 and the static contact arm 35 to contact and separate.

The vacuum environment of the vacuum arc-extinguishing chamber 3 can not only diffuse and extinguish rapidly, the breaking short-circuit current capacity is obviously higher than that of the traditional arc-extinguishing mode in air, not only can better arc-extinguishing performance be realized, but also the vacuum environment can reduce the ablation of the moving contact 34 and the fixed contact 35, and the mechanical life can be obviously prolonged. In addition, the vacuum interrupter 3 does not generate particles or high-temperature gas during arc extinction, and other switching devices can be prevented from being influenced. Before the operation handle 12 reaches the lock position, the lock mechanism locks the movable contact 34 in a state where it is not in contact with the fixed contact 35, and prevents the movable contact 34 from coming into contact with the fixed contact 35 in advance under the influence of atmospheric pressure or other factors.

Preferably, the interlocking position is located between the action position and the closing position, that is, after the operating handle 12 moves from the opening position to the action position to drive the energy storage spring 17 to pass the dead point position, the component force applied by the energy storage spring 17 to the moving direction of the operating handle 12 is changed from resistance to thrust, after the operating handle 12 continues to move for a small distance, the operating handle 12 or the operating mechanism 1 drives the interlocking piece 4 to unlock the moving contact 34, then the energy storage spring 17 drives the operating handle 12 to move to the closing position, and the operating mechanism 1 drives the moving contact 34 to contact with the fixed contact 35. It can be understood that the contact mechanism may also adopt the prior art, where the moving contact 34 is disposed on the rotating shaft mechanism 9, and the moving contact 34 is driven to swing to contact with and separate from the fixed contact 35 by the rotating shaft mechanism 9, which falls into the protection scope of the present utility model.

As shown in fig. 2-4, the phase pole unit further includes a guide plate 6 fixedly connected with the moving guide rod 32, and the driving shaft 16 of the operating mechanism 1 is directly or indirectly connected with the guide plate 6 to drive the moving contact 34 to perform opening and closing operations. The interlocking spring 5 drives the interlocking piece 4 to lock the guide plate 6 so as to lock the moving contact 34 in a state that the moving contact 34 cannot be contacted with the fixed contact 35, and the operating handle 12 drives the interlocking piece 4 to overcome the acting force of the interlocking spring 5 to release the limit of the guide plate 6 when moving to the interlocking position, so that the moving contact 34 can be driven to move towards the fixed contact 35, and the moving contact 34 is contacted with the fixed contact 35 to realize switching-on.

As shown in fig. 4-5, the interlocking mechanism further comprises an interlocking rod 7 and an interlocking spring 5 connected with the interlocking rod 7, the interlocking rod 7 is provided with a driven part 71 matched with the operating mechanism 1 and a driving part 72 matched with the interlocking piece 4, the interlocking spring 5 is used for driving the interlocking rod 7 to rotate, the interlocking rod 7 drives the interlocking piece 4 to limit the guide plate 6 through the driving part 72, and the operating mechanism 1 drives the interlocking rod 7 to rotate through the driven part 71, so that the driving part 72 drives the interlocking piece 4 to be away from the guide plate 6 against the action of the interlocking spring 5. In the present embodiment, the operating mechanism 1 drives the interlocking member 4 by a rocker arm, and a trigger portion 110 is provided on a swing arm 111 of the rocker arm to drive the driven portion 71 of the interlocking lever 7 when moving to the interlocking position.

The operating mechanism 1 of the present application is not limited to unlocking by driving the interlocking member 4 by the rocker arm, but may be configured to drive the interlocking member 4 (e.g., the operating handle 12) by other elements of the operating mechanism 1. It is obvious that the interlocking rod 7 is not required, the operating mechanism 1 can directly drive the interlocking piece 4 or indirectly drive the interlocking piece 4 through other transmission pieces, and the interlocking spring 5 can directly or indirectly act on the interlocking piece 4. Specifically, as shown in fig. 2-3, the movable connection structure 37 is electrically connected with the guide plate 6 through a flexible connection, the guide plate 6 is connected with the rotating shaft mechanism 9 through a guide connecting rod 63, the rotating shaft mechanism 9 drives the guide plate 6 to move through the guide connecting rod 63 when rotating, and drives the movable guide rod 32 to move through the guide plate 6, the flexible connection is a copper braided wire or a conductive flexible part, the flexible connection can be kept when the guide plate 6 moves relative to the movable connection structure 37, and the guide plate 6 not only plays a role of connecting the movable guide rod 32 with the rotating shaft mechanism 9, but also plays a role of electrically connecting the movable guide rod 32 with the movable connection structure 37.

Further, the guide plate 6 includes a guide connection portion 61 connected to the moving guide rod 32, and a guide interlocking portion 62 connected to the guide connection portion 61, where the interlocking member 4 is used to limit the guide interlocking portion 62 of the guide plate 6 to lock the moving contact 34 in a state that the moving contact 34 cannot contact with the fixed contact 35, and is far away from the guide plate 6 to unlock the moving contact 34 when the operating handle 12 moves to the interlocking position, and the guide plate 6 can also perform the function of locking the moving contact 34 in cooperation with the interlocking member 4. Preferably, the guide connection portion 61 is disposed perpendicular to the guide interlocking portion 62, the guide interlocking portion 62 is parallel to the moving direction of the moving contact 34, and the guide connection portion 61 is perpendicular to the moving direction of the moving contact 34. The interlocking locking part 41 of the interlocking member 4 is positioned on a path along which the guide interlocking part 62 moves along with the moving contact 34 approaching the fixed contact 35, so that the moving contact 34 is locked in a state of being incapable of contacting with the fixed contact 35, and the interlocking member 4 moves so that the interlocking locking part 41 is avoided from the guide interlocking part 62, and the locking of the moving contact 34 is released.

The three phase pole units 2 are arranged in the shell of the embodiment side by side, the three phase pole units 2 respectively comprise a static wiring structure 36, a vacuum arc extinguishing chamber 3 and a movable wiring structure 37, the corresponding movable contacts 34 provided with three interlocking pieces 4 for respectively locking the three phase pole units 2 are arranged, the interlocking rod 7 traverses the three phase pole units 2, three driving parts 72 respectively corresponding to the three phase pole units 2 and a driven part 71 corresponding to the operating mechanism 1 are arranged on the interlocking rod 7, the three driving parts 72 are sequentially arranged along the axial direction of the interlocking rod 7, the driving part 72 positioned in the middle and the driven part 71 are oppositely arranged at two radial sides of the interlocking rod 7, and the two driving parts 72 positioned at two sides are respectively connected with the shell through the interlocking springs 5;

Two baffle plates 21 for isolating the three phase pole units 2 are arranged in the shell, a raised mounting plate 22 is arranged on each baffle plate 21, a semicircular mounting groove 23 for rotatably mounting the interlocking rod 7 is arranged on each mounting plate 22, two baffle plates 77 are arranged on each interlocking rod 7 corresponding to the two baffle plates 21, and the two baffle plates 77 are respectively sleeved on the side surfaces of the two opposite sides of the corresponding baffle plates 21 to play a role in axially limiting the interlocking rod 7.

The interlocking rod 7 of this embodiment traverses the three phase pole units 2, three driving parts 72 corresponding to the three phase pole units 2 are respectively arranged on the interlocking rod 7, the operating mechanism 1 drives the interlocking rod 7 of the three phase pole units 2 to move through the interlocking rod 7, a plurality of phase pole units 2, for example, two or more than four phase pole units 2, if only one phase pole unit 2 is arranged, the interlocking rod 7 can be not arranged, and the interlocking piece 4 can be directly driven through the operating mechanism 1. In addition, in the present embodiment, two interlocking springs 5 are provided, but the number of the interlocking springs 5 may be adjusted, for example, three interlocking springs 5 are provided for each of the three driving portions 72, or only the interlocking springs 5 are provided in the driving portion 72 in the middle.

Referring to fig. 3-4, when the operating handle 12 moves to the interlocking position, the rocker arm pushes the driven portion 71 to drive the interlocking rod 7 to rotate, so that the driving portion 72 overcomes the action of the interlocking spring 5 to drive the interlocking piece 4 to be far away from the guide plate 6, and the two swinging arms 111 of the rocker arm in this embodiment are respectively provided with the triggering portion 110, and the driven portion 71 includes two push plates 73 respectively arranged corresponding to the two swinging arms 111 of the operating mechanism 1, and when the operating handle 12 moves to the interlocking position. It is understood that the operating mechanism 1 may also push the driven portion 71 through other parts to unlock the moving contact 34, for example, push the driven portion 71 through the transmission member 13 or the trip button 14 of the link mechanism, which falls within the protection scope of the present utility model.

As shown in fig. 6 to 7, the interlocking member 4 includes an interlocking locking portion 41, two interlocking sliding portions 42 respectively connected to the interlocking locking portion 41, two interlocking sliding portions 42 are disposed at intervals, an interlocking driving shaft 43 is disposed between the two interlocking sliding portions 42, the interlocking driving shaft 43 is connected between the two interlocking sliding portions 42 and disposed at intervals from the interlocking locking portion 41, a third escape groove 44 is disposed between the interlocking driving shaft 43 and the interlocking driving shaft 43, the driving portion 72 includes two driving plates 74 disposed opposite to each other, a driving groove 75 is disposed between the two driving plates 74, the driving grooves 75 are used for being sleeved on the interlocking driving shaft 43 of the interlocking member 4, the interlocking member 4 is driven to move by the interlocking driving shaft 43, and one driving plate 74 is connected to the interlocking spring 5 after passing through the interlocking member 4 from the third escape groove 44.

As shown in fig. 8-9, an interlocking seat 8 is arranged in the shell, an interlocking groove is arranged in the middle of the interlocking seat 8, the interlocking piece 4 is movably arranged in the interlocking groove and moves along the interlocking groove in a straight line, the interlocking seat 8 is arranged above the vacuum arc-extinguishing chamber 3 along the height direction of the circuit breaker, and the moving direction of the interlocking piece 4 is perpendicular to the moving direction of the moving contact 34. Specifically, the interlocking seat 8 includes two fixed curb plates that set up relatively, two fixed curb plates are the U type, two fixed curb plates include relative first side 81 and the second side 82 that sets up respectively, and connect the third side 83 between first side 81 and second side 82, enclose into the spout 84 of U type between the first side 81 of every fixed curb plate, second side 82 and the third side 83, the third side 83 of two fixed curb plates sets up relatively, the spout 84 of two fixed curb plates respectively with the both sides sliding fit of interlocking piece 4, the first side 81 interval of two fixed curb plates sets up and forms the first groove 85 of dodging that is used for passing deflector 6, be equipped with fixed roof 86 between the bottom of the second side 82 of two fixed plates, the interval sets up and forms the second groove 87 of dodging between the top of the second side 82 of two fixed plates, the drive portion 72 is equipped with the first spring plate 76 that passes the second groove 87, be equipped with the second spring plate 88 on the fixed roof 86, the both ends of spring 5 respectively with the first spring plate 76 on the connecting hole and the second spring plate 88 on the connecting hole.

Further, the interlocking locking portion 41 is provided with an interlocking protruding portion 45 protruding along the height direction of the circuit breaker, when the interlocking piece 4 moves to unlock the moving contact 34, the interlocking locking portion 41 is located outside a path along which the guiding interlocking portion 62 moves with the moving contact 34 close to the fixed contact 35, but the interlocking protruding portion 45 is located on a path along which the guiding interlocking portion 62 moves with the moving contact 34 close to the fixed contact 35, the interlocking protruding portion 45 is relatively thin, when the moving contact 34 contacts the fixed contact 35, a gap is also formed between the guiding interlocking portion 62 and the interlocking protruding portion 45, the interlocking locking portion 41 and the interlocking protruding portion 45 are provided with an interlocking sliding surface 46 protruding along the length direction of the circuit breaker, and the interlocking sliding surface 46 is in sliding fit with the fixed top plate 86, so that friction force can be reduced.

As shown in fig. 2, the circuit breaker is in a breaking state or a re-buckling state, at this time, the interlocking member 4 locks the moving contact 34, the component force of the acting force Ft of the energy storage spring 17 on the driving shaft 16 is acting force Ft ', the acting force Ft ' will enable the transmission member 13 to rotate anticlockwise around the link shaft 19, the vacuum arc extinguishing chamber 3 is influenced by the atmospheric pressure Fq due to the relative vacuum inside, the acting force Fd is applied to the driving shaft 16 through the transmission of the link mechanism, the component force Fd ' of the acting force Fd will enable the transmission member 13 to rotate clockwise around the link shaft 19, the acting force Ft ' and the acting force Fd ' are opposite in direction, and the component force Ft ' > component force Fd ' at this time, the moving contact 34 is disconnected from the fixed contact 35, and the operating handle 12 is in the breaking position.

During the closing process, the operating handle 12 drives the energy storage spring 17 to slowly rotate, the component force Ft ' is slowly reduced, the condition of the component force Ft ' < component force Fd ' occurs before the operating handle 12 passes over the action position, that is, before the energy storage spring 17 passes over the spring dead point, the transmission member 13 turns clockwise to a certain angle, the movable guide rod 32 performs closing motion, but the guide interlocking part 62 of the guide plate 6 connected with the movable guide rod 32 into a whole is blocked by the interlocking member 4, so that the closing motion of the movable guide rod 32 is prevented.

As shown in fig. 3, in the closing process of the circuit breaker, the operating handle 12 continues to rotate, after the operating handle 12 passes through the action position and drives the energy storage spring 17 to pass through the spring dead point, the component force Ft ' of the force Ft acting on the driving shaft 16 by the energy storage spring 17 slowly increases, and the direction is consistent with the component force Fd ', so that the transmission member 13 has a clockwise rotating trend, but at this time, the interlocking member 4 is still on the path of blocking the movement of the guide plate 6, when the component force Ft ' of the force Ft acting on the driving shaft 16 by the energy storage spring 17 increases to a certain extent, the operating handle 12 of the operating mechanism 1 moves to the interlocking position, and meanwhile, the operating mechanism 1 drives the interlocking member 4 to move to the position of unlocking the moving contact 34, and drives the moving contact 34 to quickly close by the energy storage spring 17, so that the moving contact 34 and the fixed contact 35 can be prevented from being led to the pilot under the condition that the operating mechanism 1 is not yet closed in place.

As shown in fig. 2-3, the rotating shaft mechanism 9 of the present embodiment includes a rotating seat 91 rotatably disposed in a housing, the rotating seats 91 of three phase pole units are linked, the rotating seat 91 of the phase pole unit disposed in the middle is respectively connected with the operating mechanism 1 through two driving connecting rods 92, the two driving connecting rods 92 are relatively disposed at two sides of the rotating seat 91, the operating mechanism 1 drives the rotating seat 91 to rotate through the driving connecting rods 92, a rotatable rotating shaft connecting rod 93 is disposed at the inner side of the rotating seat 91, the rotating shaft connecting rod 93 is rotationally connected with the guiding connecting rod 63, the rotating seat 91 drives the movable guide rod 32 to move through the rotating shaft connecting rod 93 and the guiding connecting rod 63 when rotating, the rotating shaft connecting rod 93 is disposed coincident with a rotation axis of the rotating seat 91, the rotating shaft connecting rod 93 includes a closing driven portion and a separating brake driven portion, and a closing driving plate 94 and a separating brake driving portion 95 respectively corresponding to the closing driven portion and the separating brake driven portion are disposed on the rotating seat 91.

The switch-on driving plate 94 is rotationally connected with the rotating seat 91 through a switch-on rotating shaft, the rotating seat 91 is provided with a contact spring 96 connected with the switch-on driving plate 94, the rotating seat 91 rotates clockwise under the drive of the operating mechanism 1 during switch-on to drive the switch-on driving plate 94 to push the switch-on driven part, the rotating shaft connecting rod 93 drives the moving guide rod 32 to move through the guide connecting rod 63 and the guide plate 6, the moving guide rod 32 drives the moving contact 34 to contact with the fixed contact 35, and the rotating seat 91 continues to rotate for a certain angle after the moving contact 34 contacts with the fixed contact 35 to drive the contact spring 96 of the contact 34 to push the switch-on driving plate 94 to provide a pressing force for the moving contact 34 and the fixed contact 35;

The brake separating driving part 95 and the rotating seat 91 are integrally formed, and the rotating seat 91 rotates anticlockwise under the driving of the operating mechanism 1 during brake separating and tripping to drive the brake separating driving part 95 to push the brake separating driven part, so that the rotating shaft connecting rod 93 drives the movable guide rod 32 to move through the guide connecting rod 63, the guide plate 6 and the guide column, and the movable guide rod 32 drives the movable contact 34 to be separated from the fixed contact 35.

As other embodiments, the closing driving plate 94 of the rotating shaft mechanism 9 may be integrally formed with the rotating seat 91 or fixedly arranged, or the rotating shaft mechanism 9 may be directly connected with the guide link 63, and other structures such as the rotating shaft link 93 may not be arranged.

When the circuit connected with the phase pole unit 2 fails, for example, overload or short circuit failure occurs, the protection mechanism triggers the lock catch 15 to unlock with the jump button 14, the transmission piece 13 rotates along with the jump button 14, the energy storage spring 17 is unlocked and released, the energy storage spring 17 releases energy and drives the rotating shaft mechanism 9 to rotate through the driving shaft 16, so that the rotating shaft mechanism 9 drives the moving contact 34 to be separated from the fixed contact 35, and the circuit connected with the phase pole unit 2 is disconnected, thereby realizing the protection function. The protection mechanism of this embodiment is a thermo-magnetic protection mechanism, and has overload and short-circuit protection functions at the same time, and the protection mechanism may also include an independent short-circuit protection mechanism and/or an independent overload protection mechanism, where the short-circuit protection mechanism and the overload protection mechanism can unlock the trip button 14 and the lock catch 15 respectively when a short-circuit current and an overload current occur in the circuit. The operating mechanism 1 further comprises a rebuckle 102 rotatably arranged on the bracket, the rebuckle 102 is in limit fit with the lock catch 15, the protecting mechanism releases limit of the lock catch 15 by driving the rebuckle 102 to trigger unlocking of the lock catch 15 and the jump catch 14, and when the operating mechanism 1 moves in the opening direction to conduct rebuckle action after unlocking of the jump catch 14 and the lock catch 15, the rebuckle 102 can be driven to rebuckle the lock catch 15, so that the jump catch 14 and the lock catch 15 are locked again, which is the prior art in the field.

It should be noted that, in the description of the present utility model, the terms "upper", "lower", "left", "right", "inner", "outer", and the like indicate an orientation or a positional relationship based on that shown in the drawings or an orientation or a positional relationship conventionally put in use, and are merely for convenience of description, and do not indicate that the apparatus or element to be referred to must have a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and should not be construed as indicating relative importance.

The foregoing is a further detailed description of the utility model in connection with the preferred embodiments, and it is not intended that the utility model be limited to the specific embodiments described. It will be apparent to those skilled in the art that several simple deductions or substitutions may be made without departing from the spirit of the utility model, and these should be considered to be within the scope of the utility model.

Claims (14)

1. The utility model provides a moulded case circuit breaker, includes operating device (1) and contact mechanism, contact mechanism includes moving contact (34) and stationary contact (35), and operating handle (12) are connected with operating device (1), and operating device (1) are connected with moving contact (34), operating handle (12) can be in separating brake position, action position and closing position between, action position is located separating brake position and closing position, can drive energy storage spring (17) rotation when operating handle (12) are moved to action position by one of separating brake position and closing position, drives energy storage spring and crosses the dead point position when operating handle (12) move to action position, and the component of energy storage spring application to operating handle (12) direction of motion becomes thrust by the resistance after crossing the dead point position, drives operating handle (12) through energy storage spring (17) and moves to the other of separating brake position and closing position, drives moving contact (34) and stationary contact (35) when operating handle (12) move to closing position, and drive moving contact (35) and contact characterized in that:

The automatic locking device is characterized by further comprising an interlocking mechanism, wherein the interlocking mechanism comprises an interlocking piece (4) and an interlocking spring (5), the interlocking spring (5) is used for driving the interlocking piece (4) to lock the moving contact (34) in a state that the moving contact cannot be contacted with the fixed contact (35), and in the process of moving the operating handle (12) from the opening position to the closing position, when the operating handle (12) moves to the interlocking position, the operating handle (12) or the operating mechanism (1) drives the interlocking piece (4) to unlock the moving contact (34), and the interlocking position coincides with the action position or is located between the action position and the closing position.

2. The molded case circuit breaker according to claim 1, wherein the contact mechanism comprises a vacuum arc extinguishing chamber (3), the vacuum arc extinguishing chamber (3) comprises a vacuum tube (31), a movable guide rod (32) and a static guide rod (33), the movable contact (34) and the static contact (35) are respectively arranged inside the vacuum tube (31), one ends of the movable guide rod (32) and the static guide rod (33) positioned in the vacuum tube (31) are respectively connected with the movable contact (34) and the static contact (35), and the operating mechanism (1) is connected with the movable guide rod (32).

3. The molded case circuit breaker according to claim 2, wherein the movable guide rod (32) is fixedly connected with the guide plate (6), the interlocking spring (5) drives the interlocking piece (4) to lock the guide plate (6) so as to lock the movable contact (34) in a state that the movable contact cannot be contacted with the fixed contact (35), and when the operating handle (12) moves to the interlocking position, the operating handle (12) or the operating mechanism (1) drives the interlocking piece (4) to overcome the acting force of the interlocking spring (5) to release the limit of the guide plate (6).

4. The molded case circuit breaker according to claim 3, wherein the interlocking mechanism further comprises an interlocking rod (7), the interlocking spring (5) is connected with the interlocking rod (7), the interlocking rod (7) is provided with a driven part (71) matched with the operating mechanism (1) and a driving part (72) matched with the interlocking piece (4), the interlocking spring (5) is used for driving the interlocking rod (7) to rotate, the interlocking rod (7) drives the interlocking piece (4) to limit the guide plate (6) through the driving part (72), and the operating mechanism (1) drives the interlocking rod (7) to rotate through the driven part (71), so that the driving part (72) drives the interlocking piece (4) to be far away from the guide plate (6) against the action of the interlocking spring (5).

5. The molded case circuit breaker according to claim 4, wherein the operating mechanism (1) comprises a bracket, a connecting rod mechanism and a rocker arm, wherein the connecting rod mechanism and the rocker arm are respectively arranged on the bracket, the rocker arm comprises two swing arms (111) which are respectively connected with the bracket in a rotating way and a connecting arm (112) which is connected between the two swing arms (111), the connecting arm (112) is connected with an energy storage spring (17), the operating handle (12) is connected with the connecting arm (112), and when the operating handle (12) moves to an interlocking position, the rocker arm pushes the driven part (71) to drive the interlocking rod (7) to rotate, so that the driving part (72) overcomes the action of the interlocking spring (5) to drive the interlocking piece (4) to be far away from the guide plate (6).

6. The molded case circuit breaker according to claim 5, wherein the two swing arms (111) of the rocker arm are respectively provided with a trigger portion (110), the driven portion (71) includes two push plates (73) respectively provided in correspondence with the two swing arms (111) of the operating mechanism (1), and the operating handle (12) moves to the interlocked position.

7. The molded case circuit breaker according to claim 5, wherein the link mechanism comprises a transmission member (13) and a trip button (14) which are rotatably connected, and a lock catch (15) for locking the trip button (14), wherein the transmission member (13), the trip button (14) and the lock catch (15) are rotatably arranged on the bracket respectively, a driving shaft (16) is arranged on the transmission member (13), the driving shaft (16) is connected with a connecting arm (112) of the rocker arm through an energy storage spring (17), the lock catch (15) can lock the trip button (14), a connecting rod shaft (19) connected between the transmission member (13) and the trip button (14) is used as a rotation center of the driving shaft (16), and the driving shaft (16) is connected with the guide plate (6).

8. The molded case circuit breaker according to claim 7, wherein the driving shaft (16) is provided with a rotatable operation connecting rod (161), the operation connecting rod (161) is rotatably connected with the driving connecting rod (92), the driving connecting rod (92) is connected with the rotating shaft mechanism (9), the rotating shaft mechanism (9) is rotatably arranged, the guide plate (6) is connected with the rotating shaft mechanism (9) through the guide connecting rod (63), and the guide plate (6) is connected with the movable wiring structure (37) through a soft connection.

9. The molded case circuit breaker according to claim 8, further comprising a rotating shaft mechanism (9), wherein the rotating shaft mechanism (9) comprises a rotating seat (91) rotatably arranged, the rotating seat (91) is provided with a rotating shaft connecting rod (93), and the guide plate (6) is connected with the rotating shaft connecting rod (93) through the guide connecting rod (63).

10. The molded case circuit breaker according to claim 4, wherein the interlocking member (4) comprises an interlocking locking portion (41) and two interlocking sliding portions (42) connected with the interlocking locking portion (41), the two interlocking sliding portions (42) are arranged at intervals, an interlocking driving shaft (43) is arranged between the two interlocking sliding portions (42), the interlocking driving shaft (43) is connected between the two interlocking sliding portions (42), a third avoiding groove (44) is arranged between the interlocking driving shaft (43) and the interlocking locking portion (41), the driving portion (72) comprises two driving plates (74) which are arranged oppositely, a driving groove (75) is arranged between the two driving plates (74) and is used for being sleeved on the interlocking driving shaft (43) of the interlocking member (4), the interlocking member (4) is driven to move by the interlocking driving shaft (43), and one driving plate (74) penetrates through the interlocking member (4) from the third avoiding groove (44) and is connected with the interlocking spring (5).

11. The molded case circuit breaker of claim 10, wherein an interlocking seat (8) is arranged in the shell, an interlocking groove is formed in the middle of the interlocking seat (8), the interlocking piece (4) is movably arranged in the interlocking groove and linearly moves along the interlocking groove, the interlocking seat (8) comprises two fixed side plates which are oppositely arranged, the two fixed side plates respectively comprise a first side edge (81) and a second side edge (82) which are oppositely arranged, and a third side edge (83) which is connected between the first side edge (81) and the second side edge (82), a U-shaped sliding groove (84) is formed between the first side edge (81), the second side edge (82) and the third side edge (83) of each fixed side plate in a surrounding manner, the third side edges (83) of the two fixed side plates are oppositely arranged, the sliding grooves (84) of the two fixed side plates are respectively in sliding fit with two sides of the interlocking piece (4), the first side edges (81) of the two fixed side plates are arranged between each other to form a first avoidance groove (85) which is used for penetrating through a guide plate (6), the bottom of the second side edge (82) is provided with a second side edge (86), a second spring plate (87) is arranged between the second side edges (82) of the two fixed side plates (82) is arranged between the two fixed side plates, a driving plate (72) is arranged between the two side plates (72) is arranged between the top plates, both ends of the interlocking spring (5) are respectively connected with the connecting hole on the first spring plate (76) and the connecting hole on the second spring plate (88).

12. A molded case circuit breaker according to claim 3, wherein the guide plate (6) comprises a guide connecting portion (61) connected with the movable guide rod (32) and a guide interlocking portion (62) connected with the guide connecting portion (61), the interlocking piece (4) comprises an interlocking locking portion (41), the interlocking locking portion (41) of the interlocking piece (4) is located on a path of the guide interlocking portion (62) along which the movable contact (34) moves close to the fixed contact (35) to lock the movable contact (34) in a state of being unable to contact with the fixed contact (35), and the interlocking piece (4) moves to enable the interlocking locking portion (41) to avoid the guide interlocking portion (62) to unlock the movable contact (34).

13. The molded case circuit breaker according to claim 12, wherein the guide connection portion (61) is disposed perpendicular to the guide interlocking portion (62), the guide interlocking portion (62) is parallel to the moving direction of the moving contact (34), and the guide connection portion (61) is perpendicular to the moving direction of the moving contact (34).

14. The molded case circuit breaker according to claim 4, comprising a plurality of phase pole units (2) arranged side by side, corresponding moving contacts (34) provided with a plurality of interlocking pieces (4) for locking the plurality of phase pole units (2) in a one-to-one correspondence manner, wherein the interlocking rod (7) traverses the plurality of phase pole units (2), a plurality of driving parts (72) respectively corresponding to the plurality of phase pole units (2) are arranged on the interlocking rod (7), and the interlocking piece (4) of the plurality of phase pole units (2) is driven to move by the operating mechanism (1) through the interlocking rod (7).