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] This utility model relates to the field of low-voltage electrical appliances, specifically to a molded case circuit breaker. Background Technology

[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 current under normal operating conditions, and can interrupt current in case of overload, open circuit, undervoltage, or ground fault in the line and equipment. They can also be used for infrequent starting of motors.

[0003] Most existing molded case circuit breakers extinguish arcs in an atmospheric environment using metal-plate arc-extinguishing chambers. During the circuit breaker closing process, when the rocker arm drives the main tension spring past its dead position, the upper connecting rod flips, driving the lower connecting rod, which in turn drives the rotating shaft assembly to rotate, thus closing the moving and stationary contacts. However, in the currently designed vacuum molded case circuit breakers, the moving and stationary contacts and the plate-type arc-extinguishing chamber are all replaced by a vacuum arc-extinguishing chamber. The vacuum arc-extinguishing chamber uses high vacuum as the insulation and arc-extinguishing medium. The operating mechanism controls the rotation of the rotating shaft, which drives the moving contact guide rod, thereby controlling the closing and opening of the moving and stationary contacts sealed within the vacuum arc-extinguishing chamber.

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

[0005] Due to the presence of this atmospheric pressure, the moving guide rod is constantly subjected to the atmospheric pressure that causes it to close during the circuit breaker closing process. During the closing process, the pulling force of the mechanism on the moving guide rod gradually decreases. Before the rocker arm drives the energy storage spring past its dead position, the pulling force of the mechanism on the moving guide rod will become less than the closing force exerted by atmospheric pressure on the moving guide rod. This causes the moving guide rod to move in the closing direction, and the moving and stationary contacts in the vacuum interrupter close. At this moment, the main tension spring force has not yet transformed from the opening force to the closing force, and the moving and stationary contacts have already closed. There is insufficient contact pressure between the contacts. When a large current flows between the contacts, the moving contact experiences electrodynamic repulsion, causing it to jump and easily leading to welding between the contacts. Furthermore, if the product is already conductive before the mechanism has fully closed, it can mislead the operator's judgment of the product's status, posing a safety hazard. Utility Model Content

[0006] The purpose of this utility model is to overcome at least one defect of the prior art and provide a molded case circuit breaker.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A molded case circuit breaker includes an operating mechanism and a contact mechanism. The contact mechanism includes a moving contact and a stationary contact. An operating handle is connected to the operating mechanism, and the operating mechanism is connected to the moving contact. The operating handle is movable between an open position, an operating position, and a closed position. The operating position is located between the open and closed positions. When the operating handle moves from one of the open or closed positions to the operating position, it drives an energy storage spring to rotate. When the operating handle moves to the operating position, it drives the energy storage spring past its dead point. The component of the force exerted by the energy storage spring on the operating handle in the direction of movement changes from resistance to thrust after passing the dead point. The energy storage spring drives the operating handle to move to the other of the open or closed positions. When the operating handle moves to the open position, it causes the moving contact to separate from the stationary contact. When the operating handle moves to the closed position, it causes the moving contact to contact the stationary contact.

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

[0010] Preferably, the contact mechanism includes a vacuum interrupter chamber, which includes a vacuum tube, a moving guide rod, and a stationary guide rod. The moving contact and the stationary contact are respectively disposed inside the vacuum tube. One end of the moving guide rod and the stationary guide rod located in the vacuum tube are respectively connected to the moving contact and the stationary contact. 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 component to lock the guide plate so as to lock the moving contact in a state where it cannot contact the stationary contact. When the operating handle is moved to the interlocking position, the operating handle or operating mechanism drives the interlocking component to overcome the force of the interlocking spring and release the limit on the guide plate.

[0012] Preferably, the interlocking mechanism further includes an interlocking rod, an interlocking spring connected to the interlocking rod, the interlocking rod having a driven part that cooperates with the operating mechanism and a driving part that cooperates with the interlocking component, the interlocking spring being used to drive the interlocking rod to rotate, so that the interlocking rod drives the interlocking component to limit the guide plate through the driving part, the operating mechanism driving 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 component away from the guide plate.

[0013] Preferably, the operating mechanism includes a bracket and a linkage mechanism and a rocker arm respectively mounted on the bracket. The rocker arm includes two swing arms rotatably connected to the bracket and a connecting arm connected between the two swing arms. The connecting arm is connected to an energy storage spring. The operating handle is connected to the connecting arm. When the operating handle is moved to the interlock position, the rocker arm pushes the driven part to drive the interlock rod to rotate, so that the driving part overcomes the action of the interlock spring and drives the interlocking part away from the guide plate.

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

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

[0016] Preferably, the drive shaft is provided with a rotatable operating link, the operating link is rotatably connected to the drive link, the drive link is connected to the rotating shaft mechanism, the rotating shaft mechanism is rotatably set, the guide plate is connected to the rotating shaft mechanism through the guide link, and the guide plate is connected to the moving wire structure through the flexible connection.

[0017] Preferably, it also includes a rotating shaft mechanism, which includes a rotating seat that is rotatably disposed, the rotating seat being provided with a rotating shaft connecting rod, and the guide plate being connected to the rotating shaft connecting rod through a guide connecting rod.

[0018] Preferably, the interlocking component includes an interlocking locking part and two interlocking sliding parts respectively connected to the interlocking locking part. The two interlocking sliding parts are spaced apart. An interlocking drive shaft is provided between the two interlocking sliding parts. The interlocking drive shaft is connected between the two interlocking sliding parts. A third clearance groove is provided between the interlocking drive shaft and the interlocking locking part. The drive part includes two drive plates arranged opposite to each other. A drive groove is provided between the two drive plates. The drive groove is used to fit onto the interlocking drive shaft of the interlocking component. The interlocking component is moved by the interlocking drive shaft. One of the drive plates passes through the third clearance groove of the interlocking component and is connected to the interlocking spring.

[0019] Preferably, the housing is provided with an interlocking seat, and the interlocking seat has an interlocking groove in the middle. The interlocking member is movably disposed in the interlocking groove and moves linearly along the interlocking groove. The interlocking seat includes two fixed side plates arranged opposite each other. The two fixed side plates each include a first side and a second side arranged opposite each other, and a third side connecting the first side and the second side. The first side, the second side and the third side of each fixed side plate form a U-shaped sliding groove. The third side of the two fixed side plates are arranged opposite each other. The sliding grooves of the two fixed side plates slide with the two sides of the interlocking member respectively. The first side of the two fixed side plates are spaced apart and form a first clearance groove for passing through the guide plate. A fixed top plate is provided between the bottom of the second side of the two fixed plates. A second clearance groove is spaced apart and forms the top of the second side of the two fixed plates. The driving part is provided with a first spring plate passing through the second clearance groove. A second spring plate is provided on the fixed top plate. 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. The interlocking part includes an interlocking locking part, which is located on the path of the guide interlocking part as the moving contact moves closer to the stationary contact, locking the moving contact in a state where it cannot contact the stationary contact. The movement of the interlocking part causes the interlocking locking part to avoid the guide interlocking part, thereby releasing the lock on the moving contact.

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

[0022] Preferably, it includes multiple phase pole units arranged side by side, and correspondingly has multiple interlocking parts that lock the moving contacts of the multiple phase pole units one by one. The interlocking rod passes through the multiple phase pole units and has multiple driving parts corresponding to the multiple phase pole units respectively. The operating mechanism drives the interlocking parts of the multiple phase pole units to move through the interlocking rod.

[0023] This utility model of a molded case circuit breaker can prevent the moving contact from conducting with the stationary contact before the operating mechanism is fully closed. This helps the operator judge the working status of the product, avoids misjudgment, and reduces safety hazards. Moreover, when the operating handle is moved to the operating position, the closing force of the energy storage spring is greater, which can drive the moving contact to quickly contact the stationary contact, realize the rapid closing function, and ensure that sufficient contact pressure is formed between the moving contact and the stationary contact, preventing the moving contact from jumping due to the electric repulsion force, which can easily cause welding between the contacts.

[0024] Furthermore, the contact mechanism is a vacuum interrupter. The vacuum environment of the vacuum interrupter not only allows for rapid diffusion and arc extinguishing, but also significantly enhances its ability to interrupt short-circuit current compared to traditional air-based arc extinguishing methods. This results in superior arc extinguishing performance, and the vacuum environment reduces erosion of both moving and stationary contacts, significantly extending their mechanical lifespan. Moreover, the vacuum interrupter does not generate particles or high-temperature gases during arc extinguishing, preventing any impact on other switching devices.

[0025] In addition, before the operating handle reaches the interlock position, the moving contact is locked in a state where it cannot contact the stationary contact by the interlocking mechanism, 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 to electrically connect the moving guide rod and the moving wiring structure, but also serves to lock the moving contact in conjunction with the interlocking components. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of the molded case circuit breaker of this utility model;

[0028] Figure 2 This is an analytical cross-sectional view of the molded case circuit breaker of this utility model in the open state;

[0029] Figure 3 This is an analytical cross-sectional view of the closing process of the molded case circuit breaker of this utility model;

[0030] Figure 4 This is a structural schematic diagram of the interlocking mechanism of this utility model;

[0031] Figure 5 This is a utility model Figure 4 A magnified view of a portion of the image;

[0032] Figure 6 This is a schematic diagram of the interlocking rod of this utility model;

[0033] Figure 7 This is a structural schematic diagram of the interlocking component of this utility model;

[0034] Figure 8 This is an exploded view of the interlocking mechanism of this utility model;

[0035] Figure 9 This is a utility model Figure 8 A magnified view of a portion of the image;

[0036] Figure 10 This is a structural diagram of the operating mechanism;

[0037] In the picture:

[0038] 1. Operating mechanism 19-link shaft

[0039] 2 phase pole units 21 partitions

[0040] 3 Vacuum interrupter chamber 22 mounting plate

[0041] 4-interlock component 23 mounting slot

[0042] 5-interlock spring 31 vacuum tube

[0043] 6 guide plates and 32 moving guide rods

[0044] 7-link locking rod 33 stationary guide rod

[0045] 8-link lock base with 34 moving contacts

[0046] 9-axis rotating mechanism with 35 stationary contacts

[0047] 11 rocker arm 36 stationary wiring structure

[0048] 12 operating handles 37 moving wire structure

[0049] 13 Transmission components 41 Interlocking locking parts

[0050] 14-click buckle 42-interlocking sliding part

[0051] 15 latches, 43 interlocking drive shafts

[0052] 16 drive shafts 44 third clearance slot

[0053] 17 Energy storage springs 45 Interlocking protrusions

[0054] 46 interlocking sliding surface 85 first clearance groove

[0055] 61 Guide connection part 86 Fixed top plate

[0056] 62 Guide Interlock Part 87 Second Clearance Groove

[0057] 63 Guide Link 88 Second Spring Plate

[0058] 71 Driven part 91 Rotating seat

[0059] 72 drive unit 92 drive linkage

[0060] 73 push plate, 93 rotating shaft connecting rod

[0061] 74 drive board 94 closing drive board

[0062] 75 drive slot 95 trip drive unit

[0063] 76 First Spring Plate 96 Contact Spring

[0064] 77 baffle 102 again

[0065] 81 First side 110 trigger section

[0066] 82 Second side 111 swing arm

[0067] 83 Third side 112 connecting arm

[0068] 84 slide rail 161 operating linkage Detailed Implementation

[0069] The specific embodiments of the molded case circuit breaker of this utility model are further described below with reference to the accompanying drawings. The molded case circuit breaker of this utility model 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 unit 2. The phase unit 2 includes a stationary connection structure 36, a contact mechanism, a moving connection structure 37, a rotating shaft mechanism, and a protection mechanism. The contact mechanism includes a moving contact 34 and a stationary contact 35. An operating handle 12 is connected to the operating mechanism 1, and the operating mechanism 1 is connected to the moving contact 34. The operating mechanism 1 drives the moving contact 34 to contact and separate from the stationary contact 35. The protection mechanism is used to trigger the operating mechanism 1 to drive the moving contact 34 to separate from the stationary contact 35. The stationary connection structure 36 and the moving connection structure 37 serve as the input and output terminals, respectively, for connecting the power supply and the load. The stationary connection structure 36 and the moving connection structure 37 are electrically connected to the stationary contact 35 and the moving contact 34, respectively.

[0071] Combination Figure 10 As shown, the operating mechanism 1 includes a bracket and a linkage mechanism and a rocker arm respectively mounted on the bracket. The rocker arm is connected to the operating handle 12. The rocker arm includes two opposing swing arms 111 and a connecting arm 112 connected between the two swing arms 111. The connecting arm 112 is connected to the operating handle 12. The linkage mechanism includes a rotatably connected transmission component 13 and a jump buckle 14, and a locking buckle 15 for locking the jump buckle 14. The transmission component 13, the jump buckle 14 and the locking buckle 15 are rotatably mounted on the bracket. The transmission component 13 is provided with a drive shaft 16. The drive shaft 16 is connected to the connecting arm 112 of the rocker arm through an energy storage spring 17. The locking buckle 15 can lock the jump buckle 14, so that the linkage shaft 19 connected to the transmission component 13 and the jump buckle 14 serves as the rotation center of the drive shaft 16. The drive shaft 16 is connected to the moving contact 34 through several linkages.

[0072] The operating handle 12 can move between the open position, the operating position, and the closed position. The operating position is located between the open position and the closed position. When the operating handle 12 moves from one of the open position and the closed position to the operating position, it can drive the energy storage spring 17 to rotate. When the operating handle 12 moves to the operating position, it drives the energy storage spring 17 to pass the dead point position. The component force of the energy storage spring 17 applied to the operating handle 12 in the direction of movement changes from resistance to thrust after passing the dead point position. The energy storage spring 17 drives the operating handle 12 to move to the other of the open position and the closed position. When the operating handle 12 moves to the open position, it drives the moving contact 34 to separate from the stationary contact 35. When the operating handle 12 moves to the closed position, it drives the moving contact 34 to contact the stationary contact 35. This is the prior art in this field.

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

[0074] like Figure 4 As shown, an improvement in this embodiment is that it also includes an interlocking mechanism, which includes an interlocking element 4 and an interlocking spring 5. The interlocking spring 5 is used to drive the interlocking element 4 to lock the moving contact 34 in a state where it cannot contact the stationary contact 35. During the process of the operating handle 12 moving from the open position to the closed position, when the operating handle 12 moves to the interlocking position, the operating handle 12 or the operating mechanism 1 drives the interlocking element 4 to release the lock on the moving contact 34, so that the moving contact 34 can contact the stationary contact 35 under the drive of the energy storage spring 17 releasing energy. The interlocking position coincides with the operating position or is located between the operating position and the closed position.

[0075] In this embodiment of the molded case circuit breaker, before the operating mechanism 1 is closed, the moving contact 34 and the stationary contact 35 can be prevented from conducting first. This helps the operator to judge the working status of the product, avoids misjudgment, and reduces safety hazards. Moreover, when the operating handle 12 is moved to the operating position, the closing force of the energy storage spring 17 is greater, which can drive the moving contact 34 to quickly contact the stationary contact 35, realize the fast closing function, and ensure that sufficient contact pressure is formed between the moving contact 34 and the stationary contact 35. This prevents the moving contact 34 from jumping due to the electric repulsion force, which can easily cause welding between the contacts.

[0076] The contact mechanism of this embodiment includes a vacuum interrupter 3, which comprises a vacuum tube 31, a moving guide rod 32, and a stationary guide rod 33. The internal environment of the vacuum tube 31 is a vacuum. The moving contact 34 and the stationary contact 35 are respectively disposed 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 is connected to the moving contact 34 and the stationary contact 35, respectively. The shapes of the moving contact 34 and the stationary 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 stationary guide rod 33 is simplified to a line segment to represent the stationary contact 35. The moving contact 34 and the stationary contact 35 typically have a certain volume. Figure 3 The moving contact 34 and the stationary contact 35 shown are not overlapping, but rather they are in contact with each other. The operating mechanism 1 is connected to the moving guide rod 32. In this embodiment, the drive 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 from the stationary contact 35.

[0077] The vacuum environment of the vacuum interrupter 3 not only allows for rapid diffusion and arc extinguishing, but also significantly enhances its ability to interrupt short-circuit currents compared to traditional air-based arc extinguishing methods. This results in superior arc extinguishing performance, and the vacuum environment reduces erosion of the moving contact 34 and stationary contact 35, significantly extending their mechanical lifespan. Furthermore, the vacuum interrupter 3 does not generate particles or high-temperature gases during arc extinguishing, preventing interference with other switching devices. Additionally, before the operating handle 12 reaches the interlock position, the interlocking mechanism locks the moving contact 34 in a state where it cannot contact the stationary contact 35, preventing premature contact due to atmospheric pressure or other factors.

[0078] Preferably, the interlocking position is located between the operating position and the closing position. That is, after the operating handle 12 moves from the opening position to the operating position, causing the energy storage spring 17 to pass the dead point, the component force of the energy storage spring 17 applied to the operating handle 12 in the direction of movement changes from resistance to thrust. After the operating handle 12 continues to move a short distance, the operating handle 12 or the operating mechanism 1 drives the interlocking member 4 to release the lock on 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 the stationary contact 35. It is understood that the contact mechanism can also adopt the existing technology, with the moving contact 34 set on the rotating shaft mechanism 9. The rotating shaft mechanism 9 drives the moving contact 34 to swing and contact and separate from the stationary contact 35, all of which are within the protection scope of this utility model.

[0079] like Figure 2-4As shown, the phase unit also includes a guide plate 6 fixedly connected to the moving guide rod 32. The drive 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 stationary 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 and release the limit on the guide plate 6, which can drive the moving contact 34 to move towards the stationary contact 35, so that the moving contact 34 contacts the stationary 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 has a driven part 71 that cooperates with the operating mechanism 1 and a driving part 72 that cooperates 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 interlocking member 4 to limit the guide plate 6 through the driving part 72. The operating mechanism 1 drives the interlocking rod 7 to rotate through the driven part 71, 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. In this embodiment, when the operating mechanism 1 moves to the interlocking position, it drives the interlocking member 4 through a rocker arm. The rocker arm 111 has a trigger part 110 that drives the driven part 71 of the interlocking rod 7.

[0081] It should be noted that the operating mechanism 1 of this application is not limited to unlocking the interlocking element 4 by driving it with a rocker arm; it can also drive the interlocking element 4 through other components of the operating mechanism 1 (such as the operating handle 12). Obviously, the interlocking rod 7 can also be omitted, and the operating mechanism 1 can directly drive the interlocking element 4, or indirectly drive it through other transmission components; the interlocking spring 5 can act directly or indirectly on the interlocking element 4. Specifically, as... Figure 2-3 As shown, the movable connection structure 37 and the guide plate 6 are electrically connected via a flexible connection. The guide plate 6 is connected to the rotating shaft mechanism 9 via a guide rod 63. When the rotating shaft mechanism 9 rotates, it drives the guide plate 6 to move via the guide rod 63, and the guide plate 6 drives the movable guide rod 32 to move. The flexible connection is a copper braided wire or a conductive flexible part. It is sufficient to maintain the electrical connection when the guide plate 6 moves relative to the movable connection structure 37. The guide plate 6 not only serves to connect the movable guide rod 32 and the rotating shaft mechanism 9, but also serves to electrically connect the movable guide rod 32 and the movable connection structure 37.

[0082] Furthermore, the guide plate 6 includes a guide connecting part 61 connected to the moving guide rod 32, and a guide interlocking part 62 connected to the guide connecting part 61. The interlocking member 4 is used to limit the guide interlocking part 62 of the guide plate 6 to lock the moving contact 34 in a state where it cannot contact the stationary contact 35, and to unlock the moving contact 34 by moving away from the guide plate 6 when the operating handle 12 moves to the interlocking position. The guide plate 6 can also cooperate with the interlocking member 4 to lock the moving contact 34. Preferably, the guide connecting part 61 and the guide interlocking part 62 are arranged perpendicularly, the guide interlocking part 62 is parallel to the moving direction of the moving contact 34, and the guide connecting part 61 is perpendicular to the moving direction of the moving contact 34. The interlocking locking part 41 of the interlocking component 4 is located on the path of the guide interlocking part 62 as the moving contact 34 moves close to the stationary contact 35, locking the moving contact 34 in a state where it cannot contact the stationary contact 35; the movement of the interlocking component 4 causes the interlocking locking part 41 to avoid the guide interlocking part 62, thereby releasing the lock on the moving contact 34.

[0083] In this embodiment, the housing is provided with three phase pole units 2 arranged side by side. The three phase pole units 2 respectively include a static connection structure 36, a vacuum interrupter 3, and a moving connection structure 37. Correspondingly, three interlocking parts 4 are provided to lock the moving contacts 34 of the three phase pole units 2. The interlocking rod 7 passes through the three phase pole units 2. 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. The three driving parts 72 are arranged sequentially along the axial direction of the interlocking rod 7. The driving part 72 located in the middle is arranged opposite to the driven part 71 on both sides of the radial direction of the interlocking rod 7. The two driving parts 72 located on both sides are connected to the housing through interlocking springs 5.

[0084] The housing is provided with two partitions 21 for isolating the three phase pole units 2. Each of the two partitions 21 is provided with a protruding mounting plate 22. The mounting plate 22 is provided with a semi-circular mounting groove 23 for rotatably mounting the interlocking rod 7. The interlocking rod 7 is provided with two baffles 77 corresponding to each of the two partitions 21. The two baffles 77 are respectively used to fit on the opposite sides of the corresponding partitions 21, so as to limit the axial movement of the interlocking rod 7.

[0085] In this embodiment, the interlocking rod 7 traverses three phase pole units 2. The interlocking rod 7 has three driving parts 72 corresponding to the three phase pole units 2 respectively. The operating mechanism 1 drives the interlocking rod 7 of the three phase pole units 2 to move via the interlocking rod 7. Multiple phase pole units 2 can also be provided, such as two or more phase pole units 2. If only one phase pole unit 2 is provided, the interlocking rod 7 can be omitted, and the interlocking component 4 can be directly driven by the operating mechanism 1. Furthermore, this embodiment provides two interlocking springs 5, but the number of interlocking springs 5 ​​can also be adjusted. For example, three interlocking springs 5 ​​can be provided corresponding to each of the three driving parts 72, or only the interlocking spring 5 can be provided in the middle driving part 72.

[0086] refer to Figure 3-4 When the operating handle 12 moves to the interlock 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. In this embodiment, the two swing arms 111 of the rocker arm are respectively provided with trigger parts 110. The driven part 71 includes two push plates 73 respectively provided for the two swing arms 111 of the operating mechanism 1. When the operating handle 12 moves to the interlock position, it is understood that the operating mechanism 1 can also push the driven part 71 to unlock the moving contact 34 through other parts, such as by pushing the driven part 71 through the transmission part 13 of the linkage mechanism or the jump buckle 14. All of these are within the protection scope of this utility model.

[0087] like Figure 6-7 As shown, the interlocking component 4 includes an interlocking locking part 41 and two interlocking sliding parts 42 respectively connected to the interlocking locking part 41. The two interlocking sliding parts 42 are spaced apart. An interlocking drive shaft 43 is provided between the two interlocking sliding parts 42. The interlocking drive shaft 43 is connected between the two interlocking sliding parts 42 and spaced apart from the interlocking locking part 41. A third clearance groove 44 is provided between the two interlocking drive shafts 43. The drive part 72 includes two drive plates 74 arranged opposite to each other. A drive groove 75 is provided between the two drive plates 74. The drive groove 75 is used to fit onto the interlocking drive shaft 43 of the interlocking component 4. The interlocking component 4 is moved by the interlocking drive shaft 43. One of the drive plates 74 passes through the third clearance groove 44 and is connected to the interlocking spring 5.

[0088] like Figure 8-9As shown, the housing is provided with an interlock seat 8, and the interlock seat 8 has an interlock groove in the middle. The interlocking member 4 is movably disposed in the interlock groove and moves linearly along the interlock groove. The interlock seat 8 is disposed above the vacuum interrupter 3 along the height direction of the circuit breaker. The moving direction of the interlocking member 4 is perpendicular to the moving direction of the moving contact 34. Specifically, the interlock seat 8 includes two fixed side plates arranged opposite to each other. Both fixed side plates are U-shaped. Each fixed side plate includes a first side 81 and a second side 82 arranged opposite to each other, and a third side 83 connecting the first side 81 and the second side 82. The first side 81, the second side 82 and the third side 83 of each fixed side plate form a U-shaped sliding groove 84. The third side 83 of the two fixed side plates are arranged opposite to each other. The sliding grooves 84 of the two fixed side plates slide and engage with the two sides of the interlocking member 4 respectively. A first clearance groove 85 is provided at intervals between the first side edges 81 of the fixed side plate for passing through the guide plate 6. A fixed top plate 86 is provided between the bottoms of the second side edges 82 of the two fixed plates. A second clearance groove 87 is provided at intervals 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 clearance groove 87. A second spring plate 88 is provided on the fixed top plate 86. The two ends of the interlocking spring 5 are respectively connected to the connecting holes on the first spring plate 76 and the second spring plate 88.

[0089] Furthermore, the interlocking locking part 41 is provided with an interlocking protrusion 45 that protrudes along the height direction of the circuit breaker. When the interlocking member 4 moves to unlock the position of the moving contact 34, the interlocking locking part 41 is located outside the path of the guide interlocking part 62 moving with the moving contact 34 towards the stationary contact 35, but the interlocking protrusion 45 is located on the path of the guide interlocking part 62 moving with the moving contact 34 towards the stationary contact 35. The interlocking protrusion 45 is relatively thin, and when the moving contact 34 contacts the stationary contact 35, there is also a gap between the guide interlocking part 62 and the interlocking protrusion 45. The interlocking locking part 41 and the interlocking protrusion 45 are provided with an interlocking sliding surface 46 that protrudes along the length direction of the circuit breaker. The interlocking sliding surface 46 slides with the fixed top plate 86, which can reduce friction.

[0090] like Figure 2As shown, when the circuit breaker is in the open or re-locked state, the interlocking component 4 locks the moving contact 34. The component of the force Ft exerted by the energy storage spring 17 on the drive shaft 16 is the force Ft'. The force Ft' will cause the transmission component 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 linkage mechanism, it applies a force Fd to the drive shaft 16. The component of the force Fd, Fd', will cause the transmission component 13 to rotate clockwise around the connecting rod shaft 19. The forces Ft' and Fd' are in opposite directions, and the component Ft' > the component Fd'. At this time, the moving contact 34 is disconnected from the stationary 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 gradually 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' will be less than the component force Fd', causing the transmission component 13 to rotate 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, which is connected to the moving guide rod 32, will be blocked by the interlocking part 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 operating position and drives the energy storage spring 17 past the spring dead point, the component force Ft' of the force Ft exerted by the energy storage spring 17 on the drive shaft 16 gradually increases, and its direction is consistent with the component force Fd', causing the transmission component 13 to have a clockwise rotation tendency. However, at this time, the interlocking component 4 is still locking the moving contact 34 and is still located on the path blocking the movement of the guide plate 6. When the component force Ft' of the force Ft exerted by the energy storage spring 17 on the drive shaft 16 increases to a certain extent, the operating handle 12 of the operating mechanism 1 moves to the interlocking position. At the same time, the operating mechanism 1 drives the interlocking component 4 to move and unlock the position of the moving contact 34. Through the energy storage spring 17, the operating handle 12 is driven to move quickly to the opening position, and the moving contact 34 is driven to close quickly. In this way, the moving contact 34 is quickly closed, and the moving contact 34 and the stationary contact 35 are prevented from conducting first before the operating mechanism 1 has closed to the position.

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

[0094] The closing drive plate 94 is rotatably connected to the rotating seat 91 via a 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, which drives the closing drive plate 94 to push the closing driven 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. The moving guide rod 32 drives the moving contact 34 to contact the stationary contact 35. After the moving contact 34 contacts the stationary contact 35, the rotating seat 91 continues to rotate at a certain angle, which drives the contact spring 96 of the contact 34 to push the closing drive plate 94, providing a clamping force for the moving contact 34 and the stationary contact 35.

[0095] The tripping drive unit 95 is integrally formed with the rotating seat 91. When tripping and disengaging, the rotating seat 91 rotates counterclockwise under the drive of the operating mechanism 1, which drives the tripping drive unit 95 to push the tripping driven part, so that the rotating 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. The moving guide rod 32 drives the moving contact 34 to separate from the stationary contact 35.

[0096] In other embodiments, the closing drive plate 94 of the rotating shaft mechanism 9 can also be integrally formed or fixedly installed with the rotating seat 91; or the rotating shaft mechanism 9 can be directly connected to the guide rod 63 without providing the rotating shaft rod 93 or other structures.

[0097] When a fault occurs in the line connected to phase unit 2, such as an overload or short circuit fault, the protection mechanism triggers the locking latch 15 and the trip latch 14 to unlock. The transmission component 13 rotates with the trip latch 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 via the drive shaft 16. This causes the rotating shaft mechanism 9 to separate the moving contact 34 from the stationary contact 35, disconnecting the line connected to phase unit 2 and achieving the protection function. The protection mechanism in this embodiment is a thermomagnetic protection mechanism, which has both overload and short circuit protection functions. The protection mechanism may 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 unlock the trip latch 14 and the locking latch 15 respectively when a short circuit current and an overload current occur in the line. The operating mechanism 1 also includes a re-lock 102 rotatably mounted on the bracket. The re-lock 102 is engaged with the locking latch 15 in a limiting action. The protection mechanism releases the limiting action of the locking latch 15 by driving the re-lock 102, triggering the locking latch 15 and the trip latch 14 to unlock. After the trip latch 14 and the locking latch 15 are unlocked, when the operating mechanism 1 moves in the direction of opening the circuit breaker to perform a re-locking action, it can drive the re-lock 102 to limit the locking latch 15 again, so that the trip latch 14 and the locking latch 15 are locked again. This is the prior art in this field.

[0098] It should be noted that in the description of this utility model, the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used during use. They are only for ease of description and do not indicate that the device or component referred to must have a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating relative importance.

[0099] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered 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 movable contact (34) and a fixed contact (35), an operating handle (12) being connected with the operating mechanism (1), the operating mechanism (1) being connected with the movable contact (34), the operating handle (12) being movable between an open position, an operating position and a closed position, the operating position being between the open position and the closed position, the operating handle (12) being able to drive a storage spring (17) to rotate when moving from one of the open position and the closed position to the operating position, the operating handle (12) driving the storage spring to pass a dead point position when moving to the operating position, a component of a force applied by the storage spring to the operating handle (12) being changed from a resistance to a thrust after passing the dead point position, the operating handle (12) being moved to the other of the open position and the closed position by the storage spring (17), the operating handle (12) driving the movable contact (34) to separate from the fixed contact (35) when moving to the open position, the operating handle (12) driving the movable contact (34) to contact the fixed contact (35) when moving to the closed position, characterized in that: further comprising an interlocking mechanism, the interlocking mechanism comprising an interlocking piece (4) and an interlocking spring (5), the interlocking spring (5) being used to drive the interlocking piece (4) to lock the movable contact (34) in a state that the movable contact (34) cannot contact the fixed contact (35), the operating handle (12) or the operating mechanism (1) driving the interlocking piece (4) to release the locking of the movable contact (34) when the operating handle (12) moves to an interlocking position during the movement of the operating handle (12) from the open position to the closed position, the interlocking position being coincident with the operating position or being between the operating position and the closed position. the contact mechanism comprising a vacuum interrupter (3), the vacuum interrupter (3) comprising a vacuum tube (31), a movable conductor (32) and a fixed conductor (33), the movable contact (34) and the fixed contact (35) being arranged inside the vacuum tube (31) respectively, the movable conductor (32) and the fixed conductor (33) being connected with the movable contact (34) and the fixed contact (35) respectively at one end of the vacuum tube (31), the operating mechanism (1) being connected with the movable conductor (32).

2. The molded case circuit breaker of claim 1, wherein: the movable conductor (32) being fixedly connected with a guide plate (6), the interlocking spring (5) driving the interlocking piece (4) to lock the guide plate (6) to lock the movable contact (34) in a state that the movable contact (34) cannot contact the fixed contact (35), the operating handle (12) or the operating mechanism (1) driving the interlocking piece (4) to release the limiting of the guide plate (6) against the force of the interlocking spring (5) when the operating handle (12) moves to the interlocking position.

3. The molded case circuit breaker of claim 2, wherein: ​ 4. The molded case circuit breaker of claim 3, wherein: The interlocking mechanism further comprises an interlocking rod (7) connected with the interlocking spring (5), 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 to drive the interlocking rod (7) to rotate, so that 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 move away from the guide plate (6) by overcoming the action of the interlocking spring (5).

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

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

7. The molded case circuit breaker of claim 5, wherein: The connecting rod mechanism comprises a transmission member (13) and a jump buckle (14) rotatably connected, and a lock buckle (15) used to lock the jump buckle (14), the transmission member (13), the jump buckle (14) and the lock buckle (15) are rotatably arranged on the bracket respectively, the transmission member (13) is provided with a driving shaft (16), the driving shaft (16) is connected with the connecting arm (112) of the rocker arm through the energy storage spring (17), the lock buckle (15) can lock the jump buckle (14), so that the connecting rod shaft (19) connected between the transmission member (13) and the jump buckle (14) serves as the 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 of claim 7, wherein: The driving shaft (16) is provided with a rotatable operating connecting rod (161), the operating connecting rod (161) is rotatably connected with a driving connecting rod (92), the driving connecting rod (92) is connected with a 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 a guide connecting rod (63), and the guide plate (6) is connected with a movable wiring structure (37) through a flexible connection.

9. The molded case circuit breaker of claim 8, wherein: Further comprising a rotating shaft mechanism (9), 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 of claim 4, wherein: The interlocking piece (4) comprises an interlocking locking portion (41), and two interlocking sliding portions (42) connected with the interlocking locking portion (41) respectively, 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) arranged oppositely, a driving groove (75) is arranged between the two driving plates (74), the driving groove (75) is used for sleeving the interlocking driving shaft (43) of the interlocking piece (4), and the interlocking piece (4) is driven to move through the interlocking driving shaft (43), and one of the driving plates (74) is connected with the interlocking spring (5) after passing through the interlocking piece (4) from the third avoiding groove (44).

11. The molded case circuit breaker of claim 10, wherein: The housing is provided with an interlocking seat (8), the middle part of the interlocking seat (8) is provided with an interlocking groove, the interlocking piece (4) is movably arranged in the interlocking groove and moves linearly along the interlocking groove, the interlocking seat (8) comprises two fixed side plates arranged oppositely, the two fixed side plates respectively comprise a first side edge (81) and a second side edge (82) arranged oppositely, and a third side edge (83) connected between the first side edge (81) and the second side edge (82), the first side edge (81), the second side edge (82) and the third side edge (83) of each fixed side plate surround a U-shaped sliding groove (84), the third side edges (83) of the two fixed side plates are arranged oppositely, the sliding grooves (84) of the two fixed side plates are respectively matched with the two sides of the interlocking piece (4), the first side edges (81) of the two fixed side plates are arranged at intervals and form a first avoiding groove (85) for passing through the guide plate (6), the bottoms of the second side edges (82) of the two fixed plates are provided with a fixed top plate (86), the tops of the second side edges (82) of the two fixed plates are arranged at intervals and form a second avoiding groove (87), the driving portion (72) is provided with a first spring plate (76) passing through the second avoiding groove (87), the fixed top plate (86) is provided with a second spring plate (88), and the two ends of the interlocking spring (5) are connected with the connecting holes on the first spring plate (76) and the second spring plate (88) respectively.

12. The molded case circuit breaker of claim 3, wherein: The guide plate (6) comprises a guide connecting portion (61) connected with the moving 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) moving along with the moving contact (34) to approach the static contact (35), and the moving contact (34) is locked in a state of being unable to contact the static contact (35); the interlocking piece (4) moves to make the interlocking locking portion (41) avoid the guide interlocking portion (62), and the locking of the moving contact (34) is released.

13. The molded case circuit breaker of claim 12, wherein: The guide connecting part (61) is vertically arranged with the guide interlocking part (62), the guide interlocking part (62) is parallel to the moving direction of the moving contact (34), and the guide connecting part (61) is perpendicular to the moving direction of the moving contact (34).

14. The molded case circuit breaker of claim 4, wherein: The plurality of phase pole units (2) are arranged side by side, a plurality of interlocking pieces (4) are correspondingly arranged to lock the moving contacts (34) of the plurality of phase pole units (2) one by one, the interlocking rod (7) crosses the plurality of phase pole units (2), a plurality of driving parts (72) corresponding to the plurality of phase pole units (2) are arranged on the interlocking rod (7), and the operating mechanism (1) drives the interlocking pieces (4) of the plurality of phase pole units (2) to move through the interlocking rod (7).

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