Molded case circuit breaker

Abstract

A molded case circuit breaker comprises an operating mechanism, a contact mechanism and an interlocking mechanism, an operating handle drives a moving contact to move through the operating mechanism, the interlocking mechanism comprises an interlocking piece and an interlocking spring, and the interlocking spring is used for driving the interlocking piece to lock the moving contact in a state that the moving contact cannot be in contact with a static contact. In the process that the operating handle moves from the opening position to the closing position, when the operating handle moves to the interlocking position, the operating handle or the operating mechanism drives the interlocking piece to unlock the moving contact, the operating handle is driven by the energy storage spring to move to the opening position and the closing position, and when the operating mechanism is not closed in place, the interlocking piece is driven by the energy storage spring to unlock the moving contact. According to the technical scheme, pilot connection between the moving contact and the static contact can be avoided, an operator can be helped to judge the working state of a product, misjudgment is avoided, potential safety hazards are reduced, when the operating handle moves to the action position, the closing force of the energy storage spring is larger, the moving contact can be driven to make contact with the static contact rapidly, and the rapid closing function is achieved.

Description

Technical Field

[0001] The invention relates to the field of low-voltage electrical appliances, and in particular to a molded case circuit breaker. Background Art

[0002] Molded case circuit breakers are mainly used in power distribution circuits and motor circuits with high voltage, high current and short circuit current. They are used to connect, disconnect and carry the current under normal working conditions. They can also cut off the current when the line and electrical equipment are overloaded, disconnected, undervoltage or grounding fault occurs. They can also be used for infrequent starting of motors.

[0003] Most of the existing molded case circuit breakers extinguish arcs in atmospheric environment through metal grid arc extinguishing chambers. During the closing process of the circuit breaker, when the rocker arm drives the main tension spring past the dead point, the upper connecting rod flips and drives the lower connecting rod, which in turn drives the shaft assembly to rotate, thereby closing the moving and static contacts. For the currently designed vacuum molded case circuit breaker, the moving and static contacts and the grid arc extinguishing chamber are replaced by vacuum arc extinguishing chambers. The vacuum arc extinguishing chamber uses high vacuum as the insulation and arc extinguishing medium. The operating mechanism controls the rotation of the shaft, and the shaft drives the moving contact guide rod, thereby controlling the closing and disconnection of the moving and static contacts sealed in the vacuum arc extinguishing chamber.

[0004] The interior of the vacuum interrupter is in a relative vacuum, and the moving contact guide rod is affected by the external atmospheric pressure. Therefore, in the natural state of the vacuum interrupter, the internal moving and static contacts are closed. When installed in a molded case circuit breaker, in the tripped state, the moving guide rod of the vacuum interrupter is subjected to the pulling force of the operating mechanism through the rotating shaft, thereby overcoming the atmospheric pressure and separating the moving and static contacts.

[0005] Due to the existence of this atmospheric pressure, during the closing process of the circuit breaker, the moving guide rod is always affected by the atmospheric pressure that closes it. During the closing process of the circuit breaker, the lifting force of the mechanism on the moving guide rod to open the circuit breaker gradually decreases. Before the rocker arm drives the energy storage spring to pass the dead point, the lifting force of the mechanism on the moving guide rod to open the circuit breaker will be less than the closing force applied by the atmospheric pressure on the moving guide rod, causing the moving guide rod to move in the closing direction and the moving and static contacts in the vacuum arc extinguishing chamber to close. At this moment, the main tension spring force has not yet been converted from the opening force to the closing force, and the moving and static contacts have already closed. There is not enough contact pressure between the contacts. When a large current passes between the contacts, the moving contact is subjected to the electric repulsion force and jumps, which can easily cause melting welding between the contacts. In addition, the product has been turned on before the mechanism is fully closed, which will mislead the operator to judge the status of the product and pose a safety hazard. Summary of the invention

[0006] The object of the present invention is to overcome at least one defect of the prior art and provide a molded case circuit breaker.

[0007] To achieve the above object, the present invention adopts the following technical solutions:

[0008] A molded case circuit breaker comprises an operating mechanism and a contact mechanism, wherein the contact mechanism comprises a moving contact and a static contact, an operating handle is connected to the operating mechanism, and the operating mechanism is connected to the moving contact, wherein the operating handle can move between an opening position, an action position and a closing position, wherein the action position is located between the opening position and the closing position, and when the operating handle moves from one of the opening position and the closing position to the action position, the operating handle can drive an energy storage spring to rotate, and when the operating handle moves to the action position, the energy storage spring is driven to cross a dead point position, and the component force applied by the energy storage spring to the moving direction of the operating handle changes from resistance to thrust after crossing the dead point position, and the operating handle is driven to move to the other of the opening position and the closing position through the energy storage spring, and when the operating handle moves to the opening position, the moving contact is driven to separate from the static contact, and when the operating handle moves to the closing position, the moving contact is driven to contact with the static contact,

[0009] It also includes an interlocking mechanism, which includes an interlocking part and an interlocking spring. The interlocking spring is used to drive the interlocking part to lock the moving contact in a state where it cannot contact the static contact. In the process of the operating handle moving from the opening position to the closing position, when the operating handle moves to the interlocking position, the operating handle or the operating mechanism drives the interlocking part to release the lock on the moving contact. The interlocking position coincides with the action position or is located between the action position and the closing position.

[0010] Preferably, the contact mechanism includes a vacuum arc extinguishing chamber, and the vacuum arc extinguishing chamber includes a vacuum tube, a moving guide rod and a static guide rod. The moving contact and the static contact are respectively arranged inside the vacuum tube, and one end of the moving guide rod and the static guide rod located in the vacuum tube are respectively connected to the moving contact and the static contact, and the operating mechanism is connected to the moving guide rod.

[0011] Preferably, the moving guide rod is fixedly connected to the guide plate, and the interlocking spring drives the interlocking member to lock the guide plate to lock the moving contact in a state where it cannot contact the static contact. When the operating handle moves to the interlocking position, the operating handle or the operating mechanism drives the interlocking member to overcome the force of the interlocking spring to release the limit on the guide plate.

[0012] Preferably, the interlocking mechanism also includes an interlocking rod, an interlocking spring is connected to the interlocking rod, the interlocking rod is provided with a driven part cooperating with the operating mechanism, and a driving part cooperating with the interlocking member, the interlocking spring is used to drive the interlocking rod to rotate, so that the interlocking rod drives the interlocking member limiting guide plate through the driving part, and the operating mechanism drives the interlocking rod to rotate through the driven part, so that the driving part overcomes the action of the interlocking spring and drives the interlocking member away from the guide plate.

[0013] Preferably, the operating mechanism includes a bracket and a connecting rod mechanism and a rocker arm respectively arranged on the bracket, the rocker arm includes two swing arms respectively connected to the bracket for rotation and a connecting arm connected between the two swing arms, the connecting arm is connected to the energy storage spring, and the operating handle is connected to the connecting arm. When the operating handle moves to the 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 and drives the interlocking part away from the guide plate.

[0014] Preferably, the two swing arms of the rocker arm are respectively provided with a trigger part, and the driven part includes two push plates respectively provided with the two swing arms of the corresponding operating mechanism, when the operating handle moves to the interlocking position.

[0015] Preferably, the connecting rod mechanism includes a rotatably connected transmission member and a jump buckle, and a lock buckle for locking the jump buckle. The transmission member, the jump buckle and the lock buckle are rotatably arranged on the bracket respectively. The transmission member is provided with a driving shaft, and the driving shaft is connected to the connecting arm of the rocker arm through an energy storage spring. The lock buckle can lock the jump buckle, so that the connecting rod shaft connected to the transmission member and the jump buckle serves as the rotation center of the driving shaft, and the driving shaft is connected to the guide plate.

[0016] Preferably, a rotatable operating link is provided on the driving shaft, the operating link is rotatably connected to the driving link, the driving link is connected to the rotating shaft mechanism, the rotating shaft mechanism is rotatably arranged, the guide plate is connected to the rotating shaft mechanism through the guide link, and the guide plate is connected to the dynamic wiring structure through a flexible connection.

[0017] Preferably, it further comprises a rotating shaft mechanism, the rotating shaft mechanism comprises a rotatably arranged rotating seat, the rotating seat is provided with a rotating shaft connecting rod, and the guide plate is connected to the rotating shaft connecting rod via the guide connecting rod.

[0018] Preferably, the interlocking member includes an interlocking locking portion, and two interlocking sliding portions respectively connected to the interlocking locking portions, the two interlocking sliding portions are spaced apart, an interlocking driving shaft is provided between the two interlocking sliding portions, the interlocking driving shaft is connected between the two interlocking sliding portions, a third avoidance groove is provided between the interlocking driving shaft and the interlocking locking portion, the driving portion includes two driving plates relatively arranged, a driving groove is provided between the two driving plates, the driving groove is used to be sleeved on the interlocking driving shaft of the interlocking member, and the interlocking member is driven to move by the interlocking driving shaft, wherein one of the driving plates passes through the interlocking member from the third avoidance groove and is connected to the interlocking spring.

[0019] Preferably, an interlocking seat is provided in the shell, and an interlocking groove is provided in the middle of the interlocking seat, and the interlocking member can be movably arranged in the interlocking groove and move linearly along the interlocking groove. The interlocking seat includes two fixed side plates arranged opposite to each other, and the two fixed side plates respectively include a first side edge and a second side edge arranged opposite to each other, and a third side edge connected between the first side edge and the second side edge, and the first side edge, the second side edge and the third side edge of each fixed side plate form a U-shaped slide groove, and the third side edges of the two fixed side plates are arranged opposite to each other, and the slide grooves of the two fixed side plates are respectively slidably matched with the two sides of the interlocking member, and the first side edges of the two fixed side plates are spaced apart and form a first avoidance groove for passing through the guide plate, a fixed top plate is provided between the bottom edges of the second side edges of the two fixed plates, and a second avoidance groove is formed between the top edges of the second side edges of the two fixed plates, and the driving part is provided with a first spring plate passing through the second avoidance groove, and the fixed top plate is provided with a second spring plate, and the two ends of the interlocking spring are respectively connected to the connecting holes on the first spring plate and the connecting holes on the second spring plate.

[0020] Preferably, the guide plate includes a guide connecting part connected to the moving guide rod, and a guide interlocking part connected to the guide connecting part, and the interlocking member includes an interlocking locking part, and the interlocking locking part of the interlocking member is located on the path where the guide interlocking part moves with the moving contact close to the static contact, locking the moving contact in a state where it cannot contact the static contact; the interlocking member moves so that the interlocking locking part avoids the guide interlocking part, thereby releasing the lock on the moving contact.

[0021] Preferably, the guide connection portion and the guide interlocking portion are arranged perpendicularly, the guide interlocking portion is parallel to the moving direction of the moving contact, and the guide connection portion is perpendicular to the moving direction of the moving contact.

[0022] Preferably, it includes a plurality of phase pole units arranged side by side, and a plurality of interlocking members are correspondingly provided for locking the moving contacts of the plurality of phase pole units one by one. The interlocking rod crosses the plurality of phase pole units, and a plurality of driving parts corresponding to the plurality of phase pole units are provided on the interlocking rod. The operating mechanism drives the interlocking members of the plurality of phase pole units to move through the interlocking rod.

[0023] The molded case circuit breaker of the present invention can avoid the movable contact and the stationary contact from being connected first when the operating mechanism has not yet been fully closed, which can help the operator to judge the working state of the product, avoid misjudgment, and reduce safety hazards. Moreover, when the operating handle moves to the action position, the closing force of the energy storage spring is greater, which can drive the movable contact to quickly contact the stationary contact to achieve a rapid closing function, and ensure that sufficient contact pressure is formed between the movable contact and the stationary contact, thereby avoiding the movable contact from jumping due to the electric repulsive force and easily causing fusion welding between the contacts.

[0024] In addition, the contact mechanism is a vacuum interrupter. The vacuum environment of the vacuum interrupter can not only quickly diffuse and extinguish arcs, but also significantly improve the short-circuit current breaking capacity compared to the traditional arc extinguishing method in the air. It can not only achieve better arc extinguishing performance, but also reduce the erosion of the moving and static contacts in the vacuum environment, and significantly extend the mechanical life. In addition, the vacuum interrupter will not generate particles or high-temperature gases when extinguishing arcs, which can avoid affecting other switching electrical appliances.

[0025] In addition, before the operating handle reaches the interlocking position, the interlocking mechanism locks the moving contact in a state where it cannot contact the stationary contact, preventing the moving contact from contacting the stationary contact prematurely due to atmospheric pressure or other factors.

[0026] In addition, the guide plate not only serves to connect the moving guide rod and the rotating shaft mechanism, and electrically connect the moving guide rod and the moving wiring structure, but also serves to cooperate with the interlocking member to lock the moving contact. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of a molded case circuit breaker of the present invention;

[0028] Figure 2 It is an analytical cross-sectional view of the molded case circuit breaker of the present invention in an open state;

[0029] Figure 3 It is an analytical cross-sectional view of the molded case circuit breaker of the present invention during the closing process;

[0030] Figure 4 It is a structural schematic diagram of the interlocking mechanism of the present invention;

[0031] Figure 5 The present invention Figure 4 A partial enlarged view of

[0032] Figure 6 It is a structural schematic diagram of the interlocking rod of the present invention;

[0033] Figure 7 It is a structural schematic diagram of the interlocking member of the present invention;

[0034] Figure 8 is an exploded view of the interlocking mechanism of the present invention;

[0035] Fig. 9 The present invention Figure 8 A partial enlarged view of

[0036] Fig.10 It is a structural diagram of the operating mechanism;

[0037] In the figure:

[0038] 1 operating mechanism 21 partition

[0039] 2-phase pole unit 22 mounting plate

[0040] 3 vacuum interrupter 23 installation slot

[0041] 4 interlocking parts 31 vacuum tube

[0042] 5 interlocking spring 32 moving guide rod

[0043] 6 guide plate 33 static guide rod

[0044] 7 interlocking rod 34 moving contact

[0045] 8 interlocking seat 35 static contact

[0046] 9 shaft mechanism 36 static connection structure

[0047] 11 rocker arm 37 dynamic wiring structure

[0048] 12 Operating handle 41 Interlock locking portion

[0049] 13 transmission member 42 interlocking sliding portion

[0050] 14 jump buckle 43 interlocking drive shaft

[0051] 15 lock 44 third avoidance slot

[0052] 16 driving shaft 45 interlocking protrusion

[0053] 17 energy storage spring 46 interlocking sliding surface

[0054] 19 connecting rod shaft 61 guide connection part

[0055] 62 guide interlocking part 86 fixed top plate

[0056] 63 guide link 87 second avoidance groove

[0057] 71 driven part 88 second spring plate

[0058] 72 driving unit 91 rotating seat

[0059] 73 push plate 92 driving connecting rod

[0060] 74 driving plate 93 shaft connecting rod

[0061] 75 drive slot 94 closing drive plate

[0062] 76 first spring plate 95 opening brake driving unit

[0063] 77 baffle 96 contact spring

[0064] 81 first side 102 buckle again

[0065] 82 second side 110 trigger portion

[0066] 83 third side 111 swing arm

[0067] 84 slide slot 112 connecting arm

[0068] 85 first avoidance groove 161 operating connecting rod DETAILED DESCRIPTION

[0069] The following is a further description of the specific implementation of the molded case circuit breaker of the present invention in conjunction with the embodiments given in the accompanying drawings. The molded case circuit breaker of the present invention is not limited to the description of the following embodiments.

[0070] like Figure 1-3 As shown, the molded case circuit breaker of this embodiment includes an operating mechanism 1 and at least one phase pole unit 2, wherein the phase pole unit 2 includes a static wiring structure 36, a contact mechanism, a dynamic wiring structure 37, a rotating shaft mechanism and a protection mechanism, wherein the contact mechanism includes a dynamic contact 34 and a static contact 35, the operating handle 12 is connected to the operating mechanism 1, the operating mechanism 1 is connected to the dynamic contact 34, the operating mechanism 1 drives the dynamic contact 34 to contact and separate from the static contact 35, the protection mechanism is used to trigger the operating mechanism 1 to drive the dynamic contact 34 to separate from the static contact 35, the static wiring structure 36 and the dynamic wiring structure 37 are respectively used as the incoming terminal and the outgoing terminal, and are used to connect the power supply and the load, and the static wiring structure 36 and the dynamic wiring structure 37 are respectively electrically connected to the static contact 35 and the moving contact 34.

[0071] Combination Fig.10 As shown, the operating mechanism 1 includes a bracket and a connecting rod mechanism and a rocker arm respectively arranged on the bracket, the rocker arm is connected to the operating handle 12, the rocker arm includes two swing arms 111 arranged opposite to each other and a connecting arm 112 connected between the two swing arms 111, the connecting arm 112 is connected to the operating handle 12, the connecting rod mechanism includes a rotatably connected transmission member 13 and a trip buckle 14, and a lock buckle 15 for locking the trip buckle 14, the transmission member 13, the trip buckle 14 and the lock buckle 15 are respectively rotatably arranged on the bracket, the transmission member 13 is provided with a driving shaft 16, the driving shaft 16 is connected to the connecting arm 112 of the rocker arm through an energy storage spring 17, the lock buckle 15 can lock the trip buckle 14, so that the connecting rod shaft 19 connected to the transmission member 13 and the trip buckle 14 serves as the rotation center of the driving shaft 16, and the driving shaft 16 is connected to the moving contact 34 through a plurality of connecting rods;

[0072] The operating handle 12 can move among the opening position, the action position and the closing position, the action position is located between the opening position and the closing position, and the operating handle 12 can drive the energy storage spring 17 to rotate when it moves from one of the opening position and the closing position to the action position. When the operating handle 12 moves to the action position, it drives the energy storage spring 17 to cross the dead point position. The component force applied to the movement direction of the operating handle 12 by the energy storage spring 17 changes from resistance to thrust after crossing the dead point position. The operating handle 12 is driven to move to the other of the opening position and the closing position through the energy storage spring 17. When the operating handle 12 moves to the opening position, the moving contact 34 is driven to separate from the static contact 35, and when the operating handle 12 moves to the closing position, the moving contact 34 is driven to contact with the static contact 35. This is the prior art in this field.

[0073] In this embodiment, a rotatable operating link 161 is provided on the drive shaft 16, and the operating link 161 is rotatably connected to the drive link 92, and the drive link 92 is connected to the shaft mechanism 9, and the shaft mechanism 9 drives the moving contact 34 to contact and separate with the static contact 35. Of course, as other embodiments, the drive shaft 16 can also drive the moving contact 34 in other ways.

[0074] like Figure 4 As shown, an improvement of the present embodiment is that it further includes an interlocking mechanism, wherein the interlocking mechanism includes an interlocking member 4 and an interlocking spring 5, wherein the interlocking spring 5 is used to drive the interlocking member 4 to lock the moving contact 34 in a state where it cannot contact the static contact 35, and during the process of the operating handle 12 moving 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 release the lock on the moving contact 34, so that the moving contact 34 can contact the static contact 35 under the drive of the energy storage spring 17 to release energy, and the interlocking position coincides with the action position or is located between the action position and the closing position.

[0075] The molded case circuit breaker of this embodiment can avoid the movable contact 34 and the stationary contact 35 from being connected first when the operating mechanism 1 has not yet been fully closed, which can help the operator to judge the working status of the product, avoid misjudgment, and reduce safety hazards. Moreover, when the operating handle 12 moves to the action position, the closing force of the energy storage spring 17 is greater, which can drive the movable contact 34 to quickly contact the stationary contact 35 to achieve a rapid closing function and ensure that sufficient contact pressure is formed between the movable contact 34 and the stationary contact 35, thereby avoiding the movable contact 34 from jumping due to the electric repulsive force and easily causing welding between the contacts.

[0076] The contact mechanism of this embodiment includes a vacuum interrupter 3, which includes a vacuum tube 31, a moving guide rod 32 and a static guide rod 33. The internal environment of the vacuum tube 31 is vacuum. The moving contact 34 and the static contact 35 are respectively arranged inside the vacuum tube 31. The moving guide rod 32 and the static guide rod 33 are located in the vacuum tube 31. One end is connected to the moving contact 34 and the static contact 35. The shapes of the moving contact 34 and the static contact 35 are simplified in the figure. The end face of the moving guide rod 32 is simplified to a line segment to represent the moving contact 34, and the end face of the static guide rod 33 is simplified to a line segment to represent the static contact 35. The moving contact 34 and the static contact 35 usually have a certain volume. Figure 3 The moving contact 34 and the stationary contact 35 shown are not overlapped, but the moving contact 34 and the stationary contact 35 are in contact with each other. The operating mechanism 1 is connected to the moving guide rod 32. In this embodiment, the driving shaft 16 of the operating mechanism 1 drives the moving guide rod 32 to move through the rotating shaft mechanism 9, so that the moving guide rod 32 drives the moving contact 34 to contact and separate with the stationary contact 35.

[0077] The vacuum environment of the vacuum interrupter 3 can not only diffuse and extinguish arcs quickly, but also has a significantly higher short-circuit current breaking capacity than the traditional arc extinguishing method in the air. It can not only achieve better arc extinguishing performance, but also reduce the erosion of the moving contact 34 and the static contact 35 in the vacuum environment, and the mechanical life can be significantly extended. In addition, the vacuum interrupter 3 will not produce particles or high-temperature gases when extinguishing arcs, which can avoid affecting other switching electrical appliances. In addition, before the operating handle 12 reaches the interlocking position, the moving contact 34 is locked in a state where it cannot contact the static contact 35 through the interlocking mechanism, preventing the moving contact 34 from contacting the static contact 35 in advance under the influence of atmospheric pressure or other factors.

[0078] 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 and drives the energy storage spring 17 to cross the dead point position, after the component force applied by the energy storage spring 17 to the movement direction of the operating handle 12 changes from resistance to thrust, the operating handle 12 continues to move a short distance, and then the operating handle 12 or the operating mechanism 1 drives the interlocking member 4 to release the lock on the moving contact 34, and 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 static contact 35. It can be understood that the contact mechanism can also adopt the existing technology, and the moving contact 34 is set on the rotating shaft mechanism 9, and the rotating shaft mechanism 9 drives the moving contact 34 to swing and contact and separate with the static contact 35, which all belong to the protection scope of the present invention.

[0079] like Figure 2-4As shown, the phase pole unit also includes a guide plate 6 fixedly connected to the moving guide rod 32, and the driving shaft 16 of the operating mechanism 1 is directly or indirectly connected to the guide plate 6 to drive the moving contact 34 to perform opening and closing operations. The interlocking spring 5 drives the interlocking member 4 to lock the guide plate 6, so as to lock the moving contact 34 in a state where it cannot contact the static contact 35. When the operating handle 12 moves to the interlocking position, it drives the interlocking member 4 to overcome the force of the interlocking spring 5 to release the limit on the guide plate 6, and can drive the moving contact 34 to move toward the static contact 35, so that the moving contact 34 contacts the static contact 35 to achieve closing.

[0080] like Figure 4-5 As shown, the interlocking mechanism further includes an interlocking rod 7, and an interlocking spring 5 connected to the interlocking rod 7, the interlocking rod 7 is provided with a driven portion 71 cooperating with the operating mechanism 1, and a driving portion 72 cooperating with the interlocking member 4, the interlocking spring 5 is used to drive the interlocking rod 7 to rotate, so that the interlocking rod 7 drives the limiting guide plate 6 of the interlocking member 4 through the driving portion 72, and the operating mechanism 1 drives the interlocking rod 7 to rotate through the driven portion 71, so that the driving portion 72 overcomes the effect of the interlocking spring 5 and drives the interlocking member 4 away from the guide plate 6. In this embodiment, the operating mechanism 1 drives the interlocking member 4 through the rocker arm when it moves to the interlocking position, and the rocker arm 111 is provided with a trigger portion 110 to drive the driven portion 71 of the interlocking rod 7.

[0081] It should be noted that the operating mechanism 1 of the present application is not limited to unlocking the interlocking member 4 by driving the rocker arm, and the interlocking member 4 can also be driven by other components of the operating mechanism 1 (such as the operating handle 12). Obviously, the interlocking rod 7 may not be provided, and the operating mechanism 1 may directly drive the interlocking member 4, or indirectly drive the interlocking member 4 through other transmission members; the interlocking spring 5 may directly or indirectly act on the interlocking member 4. Specifically, as Figure 2-3 As shown, the dynamic wiring structure 37 is electrically connected to the guide plate 6 through a soft connection, and the guide plate 6 is connected to the shaft mechanism 9 through a guide link 63. When the shaft mechanism 9 rotates, the guide plate 6 is driven to move through the guide link 63, and the dynamic guide rod 32 is driven to move through the guide plate 6. The soft connection is a copper braided wire or a conductive flexible part, and the electrical connection can be maintained when the guide plate 6 moves relative to the dynamic wiring structure 37. The guide plate 6 not only connects the dynamic guide rod 32 with the shaft mechanism 9, but also electrically connects the dynamic guide rod 32 with the dynamic wiring structure 37.

[0082] 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. 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 where it cannot contact the static contact 35, and when the operating handle 12 moves to the interlocking position, it moves away from the guide plate 6 to unlock the moving contact 34. The guide plate 6 can also play a role in locking the moving contact 34 in cooperation with the interlocking member 4. Preferably, the guide connection portion 61 is vertically arranged with 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 interlock locking portion 41 of the interlocking member 4 is located on the path where the guide interlocking portion 62 moves with the moving contact 34 toward the stationary contact 35, locking the moving contact 34 in a state where it cannot contact the stationary contact 35; the interlocking member 4 moves so that the interlock locking portion 41 avoids the guide interlocking portion 62, thereby releasing the lock on the moving contact 34.

[0083] The housing of the present embodiment is provided with three phase pole units 2 arranged side by side, and the three phase pole units 2 respectively include a static wiring structure 36, a vacuum interrupter 3 and a dynamic wiring structure 37, and correspondingly provided with three interlocking members 4 respectively lock the dynamic contacts 34 of the three phase pole units 2, and the interlocking rod 7 crosses the three phase pole units 2, and the interlocking rod 7 is provided with three driving parts 72 corresponding to the three phase pole units 2, and a driven part 71 corresponding to the operating mechanism 1, and the three driving parts 72 are sequentially arranged along the axial direction of the interlocking rod 7, wherein the driving part 72 located in the middle is arranged on both sides of the radial direction of the interlocking rod 7 opposite to the driven part 71, wherein the two driving parts 72 located on both sides are connected to the housing through the interlocking springs 5 ​​respectively;

[0084] The shell is provided with two partitions 21 for isolating the three phase pole units 2, and the two partitions 21 are respectively provided with a raised mounting plate 22, and the mounting plate 22 is provided with a semicircular mounting groove 23 for rotatably mounting the interlocking rod 7. The interlocking rod 7 is respectively provided with two baffles 77 corresponding to the two partitions 21, and the two baffles 77 are respectively used to be sleeved on the opposite side surfaces of the corresponding partitions 21, so as to play the role of axial limiting the interlocking rod 7.

[0085] In this embodiment, the interlocking rod 7 crosses the three phase pole units 2, and three driving parts 72 corresponding to the three phase pole units 2 are provided on the interlocking rod 7. The operating mechanism 1 drives the interlocking rods 7 of the three phase pole units 2 to move through the interlocking rod 7. Multiple phase pole units 2, such as two and more than four phase pole units 2, can also be provided. If only one phase pole unit 2 is provided, the interlocking rod 7 may not be provided, but the interlocking member 4 may be directly driven by the operating mechanism 1. In addition, two interlocking springs 5 ​​are provided in this embodiment, but the number of interlocking springs 5 ​​can also be adjusted, for example, three interlocking springs 5 ​​are provided corresponding to the three driving parts 72, or the interlocking spring 5 is provided only in the middle driving part 72.

[0086] refer to Figure 3-4 When the operating handle 12 moves to the interlocking position, the rocker arm pushes the actuated part 71 to drive the interlocking rod 7 to rotate, so that the driving part 72 overcomes the effect of the interlocking spring 5 and drives the interlocking member 4 away from the guide plate 6. The two swing arms 111 of the rocker arm of this embodiment are respectively provided with a trigger part 110, and the actuated part 71 includes two push plates 73 respectively provided with the two swing arms 111 of the corresponding operating mechanism 1. When the operating handle 12 moves to the interlocking position. It can be understood that the operating mechanism 1 can also unlock the moving contact 34 by pushing the actuated part 71 through other parts, such as by pushing the actuated part 71 through the transmission part 13 or the jump buckle 14 of the connecting rod mechanism, which all belong to the protection scope of the present invention.

[0087] like Figure 6-7 As shown, the interlocking member 4 includes an interlocking locking portion 41, and two interlocking sliding portions 42 respectively connected to the interlocking locking portion 41, the two interlocking sliding portions 42 are spaced apart, an interlocking driving shaft 43 is provided between the two interlocking sliding portions 42, the interlocking driving shaft 43 is connected between the two interlocking sliding portions 42, and is spaced apart from the interlocking locking portion 41, a third avoidance groove 44 is provided between the interlocking driving shaft 43 and the interlocking driving shaft 43, the driving portion 72 includes two driving plates 74 arranged opposite to each other, a driving groove 75 is provided between the two driving plates 74, the driving groove 75 is used to be sleeved on the interlocking driving shaft 43 of the interlocking member 4, and the interlocking member 4 is driven to move by the interlocking driving shaft 43, and one of the driving plates 74 passes through the interlocking member 4 from the third avoidance groove 44 and is connected to the interlocking spring 5.

[0088] like Figure 8-9As shown, an interlocking seat 8 is provided in the housing, and an interlocking groove is provided in the middle of the interlocking seat 8. The interlocking member 4 can be movably arranged in the interlocking groove and move linearly along the interlocking groove. The interlocking seat 8 is arranged above the vacuum interrupter 3 along the height direction of the circuit breaker, and the moving direction of the interlocking member 4 is arranged perpendicular to the moving direction of the moving contact 34. Specifically, the interlocking seat 8 includes two fixed side plates arranged opposite to each other, and the two fixed side plates are both U-shaped. The two fixed side plates respectively include a first side edge 81 and a second side edge 82 arranged opposite to each other, and a third side edge 83 connected between the first side edge 81 and the second side edge 82. A U-shaped slide 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. The third side edges 83 of the two fixed side plates are arranged opposite to each other. The slide grooves 84 of the two fixed side plates are respectively slidably matched with the two sides of the interlocking member 4. The two fixed side plates are A first avoidance groove 85 for passing the guide plate 6 is arranged between the first side edges 81 of the fixed side plates, a fixed top plate 86 is arranged between the bottoms of the second side edges 82 of the two fixed plates, a second avoidance groove 87 is arranged between the tops of the second side edges 82 of the two fixed plates, the driving part 72 is provided with a first spring plate 76 passing through the second avoidance groove 87, a second spring plate 88 is provided on the fixed top plate 86, and both ends of the interlocking spring 5 are respectively connected to the connecting holes on the first spring plate 76 and the connecting holes on the second spring plate 88.

[0089] Furthermore, the interlock locking portion 41 is provided with an interlocking protrusion 45 protruding along the height direction of the circuit breaker. When the interlocking member 4 moves to the position of unlocking the moving contact 34, the interlock locking portion 41 is located outside the path of the guide interlocking portion 62 following the moving contact 34 to move close to the static contact 35, but the interlocking protrusion 45 is located on the path of the guide interlocking portion 62 following the moving contact 34 to move close to the static contact 35. The interlocking protrusion 45 is relatively thin. When the moving contact 34 contacts the static contact 35, there is also a gap between the guide interlocking portion 62 and the interlocking protrusion 45. The interlock locking portion 41 and the interlocking protrusion 45 are provided with an interlocking sliding surface 46 in the shape of an arc protruding along the length direction of the circuit breaker. The interlocking sliding surface 46 is slidably matched with the fixed top plate 86 to reduce friction.

[0090] like Figure 2As shown, the circuit breaker is in the open state or the re-locked state. At this time, the interlocking member 4 locks the moving contact 34, and the component force Ft of the energy storage spring 17 on the drive shaft 16 is the force Ft'. The force Ft' will cause the transmission member 13 to rotate counterclockwise around the connecting rod shaft 19. Since the vacuum interrupter 3 is relatively vacuum inside, the moving guide rod 32 is affected by the atmospheric pressure Fq. Through the transmission of the connecting rod mechanism, a force Fd is applied to the drive shaft 16. The component force Fd' of the force Fd will cause the transmission member 13 to rotate clockwise around the connecting rod shaft 19. The force Ft' and the force Fd' are in opposite directions, and the component force Ft'>the component force Fd'. At this time, the moving contact 34 is disconnected from the static contact 35, and the operating handle 12 is in the open position.

[0091] During the closing process, the operating handle 12 drives the energy storage spring 17 to rotate slowly, and the component force Ft' will slowly decrease. Before the operating handle 12 passes the action position, that is, before the energy storage spring 17 passes the spring dead point, the component force Ft' < component force Fd' will appear, causing the transmission member 13 to flip clockwise by a certain angle, and the moving guide rod 32 to perform the closing movement. However, the guide interlocking part 62 of the guide plate 6 to which the moving guide rod 32 is connected as an integral whole will be blocked by the interlocking member 4, thereby preventing the closing movement of the moving guide rod 32.

[0092] like Figure 3 As shown, during the closing process of the circuit breaker, the operating handle 12 continues to rotate. After the operating handle 12 passes the action position and drives the energy storage spring 17 to pass the spring dead point, the component force Ft' of the force Ft applied by the energy storage spring 17 to the drive shaft 16 slowly increases, and the direction is consistent with the component force Fd', so that the transmission member 13 tends to rotate clockwise, but at this time the interlocking member 4 is still locking the moving contact 34 and is still located on the path that blocks the movement of the guide plate 6. When the component force Ft' of the force Ft applied by the energy storage spring 17 to the drive shaft 16 increases to a certain extent, the operating handle 12 of the operating mechanism 1 moves to the interlocking position, and at the same time, the operating mechanism 1 drives the interlocking member 4 to move to the position of unlocking the moving contact 34, and drives the operating handle 12 to quickly move to the opening position through the energy storage spring 17, and at the same time drives the moving contact 34 to close quickly, thereby realizing the rapid closing of the moving contact 34 and avoiding the moving contact 34 and the static contact 35 from being turned on first when the operating mechanism 1 has not yet closed.

[0093] like Figure 2-3As shown, the rotating shaft mechanism 9 of this embodiment includes a rotating seat 91 rotatably arranged in the shell, and the rotating seats 91 of the three phase pole units are linked. The rotating seat 91 of the phase pole unit located in the middle is respectively connected to the operating mechanism 1 through two driving connecting rods 92. The two driving connecting rods 92 are relatively arranged on both sides of the rotating seat 91. The operating mechanism 1 drives the rotating seat 91 to rotate through the driving connecting rod 92. A rotatable rotating shaft connecting rod 93 is provided on the inner side of the rotating seat 91. The rotating shaft connecting rod 93 is rotatably connected with the guide connecting rod 63. When the rotating seat 91 rotates, the rotating shaft connecting rod 93 and the guide connecting rod 63 drive the guide rod 32 to move. The rotating shaft connecting rod 93 is arranged to coincide with the rotation axis of the rotating seat 91. The rotating shaft connecting rod 93 includes a closing actuated part and an opening actuated part. The rotating seat 91 is provided with a closing driving plate 94 and an opening driving part 95 corresponding to the closing actuated part and the opening actuated part respectively.

[0094] The closing drive plate 94 is rotatably connected to the rotating seat 91 through the closing shaft. The rotating seat 91 is provided with a contact spring 96 connected to the closing drive plate 94. When closing, the rotating seat 91 rotates clockwise under the drive of the operating mechanism 1, driving the closing drive plate 94 to push the closing actuated part, so that the shaft connecting rod 93 drives the moving guide rod 32 to move through the guide connecting rod 63 and the guide plate 6, and the moving guide rod 32 drives the moving contact 34 to contact with the static contact 35. After the moving contact 34 contacts with the static contact 35, the rotating seat 91 continues to rotate a certain angle, driving the contact spring 96 of the contact 34 to push the closing drive plate 94, providing a pressing force for the moving contact 34 and the static contact 35.

[0095] The opening drive part 95 is integrally formed with the rotating seat 91. When opening and tripping, the rotating seat 91 rotates counterclockwise under the drive of the operating mechanism 1, driving the opening drive part 95 to push the opening driven part, so that the shaft connecting rod 93 drives the moving guide rod 32 to move through the guide connecting rod 63, the guide plate 6, and the guide column, and the moving guide rod 32 drives the moving contact 34 to separate from the static contact 35.

[0096] As other embodiments, the closing drive plate 94 of the rotating shaft mechanism 9 may be integrally formed with or fixedly arranged on the rotating seat 91; or the rotating shaft mechanism 9 may be directly connected to the guide connecting rod 63 without setting the rotating shaft connecting rod 93 or other structures.

[0097] When a fault occurs in the line connected to the phase pole unit 2, such as an overload or short circuit fault, the protection mechanism triggers the lock buckle 15 to unlock the trip buckle 14, and the transmission member 13 rotates with the trip buckle 14, unlocking and releasing the energy storage spring 17. 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 and the static contact 35 to separate, so that the line connected to the phase pole unit 2 is disconnected, and the protection function is realized. The protection mechanism of this embodiment is a thermal magnetic protection mechanism, which has both overload and short circuit protection functions. The protection mechanism can also include an independent short circuit protection mechanism and / or an independent overload protection mechanism. The short circuit protection mechanism and the overload protection mechanism can respectively unlock the trip buckle 14 and the lock buckle 15 when a short circuit current and an overload current occur in the line. The operating mechanism 1 also includes a re-buckle 102 rotatably arranged on the bracket, and the re-buckle 102 cooperates with the lock buckle 15 to limit the position. The protection mechanism releases the limit on the lock buckle 15 by driving the re-buckle 102, triggering the lock buckle 15 and the trip buckle 14 to unlock; after the trip buckle 14 and the lock buckle 15 are unlocked, when the operating mechanism 1 moves in the direction of opening the gate to perform a re-buckle action, the re-buckle 102 can be driven to limit the lock buckle 15 again, so that the trip buckle 14 and the lock buckle 15 are re-locked. This is the prior art in the field.

[0098] It should be noted that in the description of the present invention, the terms "upper", "lower", "left", "right", "inner", "outer", etc. indicate directions or positional relationships based on directions or positional relationships shown in the accompanying drawings, or directions or positional relationships that are usually placed when in use, and are only for the convenience of description, rather than indicating that the device or element referred to must have a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish descriptions, and cannot be understood as indicating relative importance.

[0099] The above contents are further detailed descriptions of the present invention in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. A molded case circuit breaker, comprising an operating mechanism (1) and a contact mechanism, the contact mechanism comprising a moving contact (34) and a stationary contact (35), an operating handle (12) connected to the operating mechanism (1), the operating mechanism (1) connected to the moving contact (34), the operating handle (12) being movable between an opening position, an operating position and a closing position, the operating position being between the opening position and the closing position, the operating handle (12) being able to drive an energy storage spring (17) to rotate when it moves from one of the opening position and the closing position to the operating position, When the operating handle (12) moves to the action position, the energy storage spring is driven to cross the dead point position. After crossing the dead point position, the component force applied by the energy storage spring to the moving direction of the operating handle (12) changes from resistance to thrust. The operating handle (12) is driven to move to the other of the opening position and the closing position through the energy storage spring (17). When the operating handle (12) moves to the opening position, the moving contact (34) is driven to separate from the static contact (35). When the operating handle (12) moves to the closing position, the moving contact (34) is driven to contact with the static contact (35). The invention is characterized in that: The invention also comprises an interlocking mechanism, wherein the interlocking mechanism comprises an interlocking member (4) and an interlocking spring (5), wherein the interlocking spring (5) is used to drive the interlocking member (4) to lock the moving contact (34) in a state where the moving contact (34) cannot contact the stationary contact (35), and when the operating handle (12) moves from the opening position to the closing position, the operating handle (12) or the operating mechanism (1) drives the interlocking member (4) to release the lock on the moving contact (34), and the interlocking position coincides with the actuation position or is located between the actuation position and the closing position.

2. The molded case circuit breaker according to claim 1, characterized in that: The contact mechanism comprises a vacuum interrupter (3), the vacuum interrupter (3) comprising a vacuum tube (31), a moving guide rod (32) and a stationary guide rod (33), the moving contact (34) and the stationary contact (35) are respectively arranged inside the vacuum tube (31), one end of the moving guide rod (32) and the stationary guide rod (33) located in the vacuum tube (31) are respectively connected to the moving contact (34) and the stationary contact (35), and the operating mechanism (1) is connected to the moving guide rod (32).

3. The molded case circuit breaker according to claim 2, characterized in that: The movable guide rod (32) is fixedly connected to the guide plate (6); the interlocking spring (5) drives the interlocking member (4) to lock the guide plate (6) so as to lock the movable contact (34) in a state where it cannot contact the stationary contact (35); 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 overcome the action force of the interlocking spring (5) to release the limit on the guide plate (6).

4. The molded case circuit breaker according to claim 3, characterized in that: The interlocking mechanism further comprises an interlocking rod (7), an interlocking spring (5) being connected to the interlocking rod (7), the interlocking rod (7) being provided with a driven portion (71) cooperating with the operating mechanism (1), and a driving portion (72) cooperating with the interlocking member (4), the interlocking spring (5) being used to drive the interlocking rod (7) to rotate, so that the interlocking rod (7) drives the interlocking member (4) to limit the guide plate (6) through the driving portion (72), and the operating mechanism (1) drives the interlocking rod (7) to rotate through the driven portion (71), so that the driving portion (72) overcomes the action of the interlocking spring (5) and drives the interlocking member (4) away from the guide plate (6).

5. The molded case circuit breaker according to claim 4, characterized in that: The operating mechanism (1) comprises a bracket, and a connecting rod mechanism and a rocker arm respectively arranged on the bracket. The rocker arm comprises two swing arms (111) respectively connected to the bracket for rotation, and a connecting arm (112) connected between the two swing arms (111). The connecting arm (112) is connected to an energy storage spring (17). The operating handle (12) is connected to the connecting arm (112). 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) and drives the interlocking member (4) away from the guide plate (6).

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

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

8. The molded case circuit breaker according to claim 7, characterized in that: The driving shaft (16) is provided with a rotatable operating link (161), the operating link (161) is rotatably connected to the driving link (92), the driving link (92) is connected to the rotating shaft mechanism (9), the rotating shaft mechanism (9) is rotatably arranged, the guide plate (6) is connected to the rotating shaft mechanism (9) via the guide link (63), and the guide plate (6) is connected to the dynamic wiring structure (37) via a flexible connection.

9. The molded case circuit breaker according to claim 8, characterized in that: It also comprises a rotating shaft mechanism (9), the rotating shaft mechanism (9) comprises a rotating seat (91) which is rotatably arranged, the rotating seat (91) is provided with a rotating shaft connecting rod (93), and the guide plate (6) is connected to the rotating shaft connecting rod (93) via a guide connecting rod (63).

10. The molded case circuit breaker according to claim 4, characterized in that: The interlocking member (4) comprises an interlocking locking portion (41) and two interlocking sliding portions (42) respectively connected to the interlocking locking portion (41). The two interlocking sliding portions (42) are arranged at an interval. 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 avoidance 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) arranged opposite to each other. A driving groove (75) is arranged between the two driving plates (74). The driving groove (75) is used to be sleeved on the interlocking driving shaft (43) of the interlocking member (4) to drive the interlocking member (4) to move through the interlocking driving shaft (43). One of the driving plates (74) passes through the interlocking member (4) from the third avoidance groove (44) and is connected to the interlocking spring (5).

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