A low voltage circuit breaker

Abstract

The present invention provides a low-voltage circuit breaker, which belongs to the technical field of circuit breakers. The invention includes a circuit breaker body, wiring terminals and guide rails, and also includes: a limit clamping assembly, a blocking assembly, and a clamping assembly; by pulling a pull rod and pressing a dial rod, the wiring terminals and the movable clamp can be quickly unlocked to achieve rapid replacement of the circuit breaker, and during the wiring process, the internal circuit of the circuit breaker is in a disconnected state; the protective frame formed by the sliding block and the fixed baffle, and the expansion and contraction of the airbag, together fix and seal the wiring terminals, reduce the influence of external factors such as water vapor and dust on the wiring port, and prevent staff from accidentally touching it, further enhancing the safety of operation; the clamping assembly can better match wiring terminals of different specifications through the expansion and contraction of the airbag and the compression and release of the spring, ensure the stability of the wiring terminals, and effectively reduce the risk of poor electrical connection or damage caused by shaking of the wiring terminals.

Description

Technical Field

[0001] The present invention relates to the technical field of circuit breakers, and in particular to a low-voltage circuit breaker. Background Art

[0002] A circuit breaker is a switching device that can close, carry and interrupt current under normal circuit conditions and can close, carry and interrupt current under abnormal circuit conditions within a specified time. It has overload, short circuit and undervoltage protection functions to protect lines and power equipment from damage.

[0003] In the prior art, switch circuit breakers are used as components for monitoring various electrical energies such as current and voltage, and damage and replacement are common. However, the existing circuit breaker terminals are mostly fixed with bolts, which requires professional tools and operating skills. When replacing the circuit breaker, the staff needs to frequently remove and install the bolts. The operation process is cumbersome and time-consuming, especially in the compact distribution cabinet with limited operating space, which further aggravates the difficulty of operation. In addition, the prior art generally lacks a fixed treatment for the terminal, resulting in the terminal being prone to shaking when the circuit breaker is moved on the guide rail after installation. This shaking can lead to unstable electrical connections, affecting current transmission and voltage monitoring.

[0004] How to invent a low-voltage circuit breaker to solve these problems has become an urgent problem to be solved by those skilled in the art. Summary of the Invention

[0005] In order to make up for the above deficiencies, the present invention provides a low-voltage circuit breaker, aiming to solve the problems mentioned in the above background.

[0006] The present invention is achieved in that:

[0007] The present invention provides a low-voltage circuit breaker, comprising a circuit breaker body, a wiring terminal, and a guide rail. A movable snap is provided on the rear side of the circuit breaker body, and the circuit breaker body is slidably engaged with the guide rail via the movable snap. A mounting cavity is provided inside the circuit breaker body, and a wiring port for inserting the wiring terminal is provided on the side wall of the circuit breaker body. The wiring port is communicated with the mounting cavity. A conductive spring and a conductive terminal are provided in the mounting cavity. The conductive spring is fixedly mounted in the mounting cavity, and the conductive terminal is slidably connected to the inner cavity of the mounting cavity. The conductive terminal is arranged in conjunction with the wiring terminal, and the conductive terminal is electrically connected to the conductive spring, and the conductive spring is electrically connected to the fixed contact of the circuit breaker body. The circuit breaker also includes:

[0008] Limiting clamping assembly: The limiting clamping assembly is arranged inside and outside the installation cavity. The limiting clamping assembly is used to connect the circuit breaker body and the terminal block, and can control the power-on state of the circuit breaker body;

[0009] Blocking assembly: The blocking assembly is arranged outside the circuit breaker body and blocks the wiring port according to the state of the limit clamping assembly;

[0010] Clamping assembly: The clamping assembly is arranged in the blocking assembly, and the clamping assembly is used to clamp and fix terminal blocks of different specifications.

[0011] Preferably, a shift rod is fixedly installed in the lower end notch of the movable buckle, and the front end of the shift rod extends beyond the front side of the circuit breaker body.

[0012] Preferably, the limit clamping assembly includes a pull rod, a pull plate, a limit pin, a connecting bolt, a positioning plate, a push plate and a movable block. The positioning plate is fixedly arranged inside the installation cavity, and the push plate is slidably connected to the installation cavity. The positioning plate and the push plate are cooperated. The rear end of the connecting bolt is fixedly connected to the limit ring. After the connecting bolt passes through the positioning plate, it is clamped with the push plate through the limit ring. The positioning plate and the push plate are elastically connected by a spring. A mounting hole for the spring to pass through is provided on the positioning plate, and the spring is sleeved on the outside of the connecting bolt.

[0013] Preferably, one end of the pull plate is sleeved on the front end of the connecting bolt, and the other end is rotatably engaged with the pull rod through a limit pin. A slot for the pull plate to pass through is provided on the circuit breaker body, and the end of the pull plate extends beyond the front side of the circuit breaker body.

[0014] Preferably, the outer side wall of the push plate is fixedly connected with an upper rack, the side wall of the movable block is fixedly connected with a lower rack, the upper rack and the lower rack are arranged on the same side, and a gear is rotatably connected on the side wall of the mounting cavity facing the upper rack, the upper rack and the gear, and the lower rack and the gear are all meshed, and the conductive terminal is fixedly set on the movable block.

[0015] Preferably, the side wall of the conductive terminal in the initial state is in contact with the conductive spring sheet, and at this time the wiring terminal is in contact with the conductive terminal under the action of the push plate. When the pull rod is pulled, the wiring terminal can enter and exit the installation cavity through the wiring port, and there is a gap between the side wall of the conductive terminal and the conductive spring sheet.

[0016] Preferably, the blocking assembly includes a sliding block and a fixed baffle, the lower side wall of the sliding block is fixedly connected to a connecting plate, the sliding block is fixedly connected to the upper side wall of the push plate through the connecting plate, and the fixed baffle is fixedly connected to the circuit breaker body and is arranged around the wiring port.

[0017] Preferably, a groove is provided on one side of the sliding block facing the wiring port, the cross-section of the fixed baffle is U-shaped, the side wall of the sliding block slides in contact with the inner wall of the fixed baffle, and the sliding block and the fixed baffle in the initial state cooperate to press the wiring terminal on both sides, and the gap between the sliding block and the fixed baffle when the pull rod is pulled is sufficient for the wiring terminal to pass through.

[0018] Preferably, the clamping assembly includes an airbag, a fixed slider fixedly connected to the end of the fixed baffle toward the sliding block, and a sliding cavity, an air guide tube and an air storage cavity arranged inside the sliding block. A placement groove is provided inside the groove on the sliding block, the airbag is fixedly arranged in the placement groove, the side wall of the sliding block is provided with a sliding groove matching the fixed slider, and a sealing plug is installed on the fixed slider located inside the sliding cavity, one end of the air guide tube passes through the sliding block and the side wall of the airbag, and the other end passes through the side wall of the fixed slider and the sealing plug, and the side wall of the sealing plug away from the airbag is fixedly connected to two accordion covers, the end of the accordion cover is fixedly connected to the inner wall of the sliding block, the accordion cover is located on the outside of the air guide tube port, and the air storage cavity is surrounded by the sealing plug, two accordion covers and the inner wall of the sliding block.

[0019] Preferably, the sealing plug, the accordion cover and the inner cavity of the sliding block are slidingly sealed and connected, the cross-section of the airbag is U-shaped, the airbag is in an unsaturated state when the pull rod is pulled, the end of the air guide tube close to the groove is fixedly connected to the inner wall of the sliding block, and the end of the air guide tube away from the groove is slidingly sealed and connected to the fixed slider and the sealing plug, and the end of the air guide tube away from the groove is always inside the air storage cavity.

[0020] The beneficial effects of the present invention are:

[0021] By pulling the pull rod and pressing the lever, users can quickly unlock the terminal blocks and movable clips to quickly replace the circuit breaker. This design does not require the removal of bolts and operating tools, and the replacement operation can be easily completed even in the compact space of the distribution cabinet, greatly improving work efficiency. During the wiring process, the contact state between the conductive terminal and the conductive spring can be changed to ensure that the internal circuit is in a disconnected state before the new circuit breaker is installed and the circuit connection is re-established, thereby avoiding electrical accidents caused by misoperation.

[0022] The protective frame formed by the sliding block and the fixed baffle, as well as the inflation and contraction of the airbag, jointly fix and seal the terminal blocks, reducing the impact of external factors such as moisture and dust on the terminal ports, while also preventing workers from accidentally touching them, further enhancing operational safety; the clamping assembly can better match terminal blocks of different specifications through the inflation and contraction of the airbag, as well as the compression and release of the spring, ensuring stable fixation of the terminal blocks. This design effectively reduces the risk of poor electrical connection or damage caused by shaking of the terminal blocks; by optimizing the fixing method and sealing mechanism of the terminal blocks, the device reduces the impact of external factors on the internal electrical connections of the circuit breaker, thereby improving the performance and reliability of the circuit breaker, while also extending the service life of the circuit breaker and reducing maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0024] Figure 1 This is a schematic diagram of the overall structure of a low-voltage circuit breaker provided by the present invention;

[0025] Figure 2 This is a structural diagram of a low-voltage circuit breaker provided by the present invention during installation;

[0026] Figure 3 This is a schematic diagram of the structure of a low-voltage circuit breaker lever provided by the present invention;

[0027] Figure 4 This is a schematic diagram of the cross-sectional structure of a low-voltage circuit breaker provided by the present invention;

[0028] Figure 5 This is a schematic cross-sectional view of a low-voltage circuit breaker installation cavity provided by the present invention;

[0029] Figure 6 The present invention provides a low voltage circuit breaker Figure 5 A in the middle is an enlarged structural diagram;

[0030] Figure 7 This is a structural schematic diagram of a low-voltage circuit breaker provided by the present invention when a pull rod is pulled;

[0031] Figure 8 This is a structural schematic diagram of a low-voltage circuit breaker provided by the present invention in an initial state;

[0032] Figure 9This is a schematic diagram of the position structure of the conductive spring and the conductive terminal of a low-voltage circuit breaker in the initial state provided by the present invention;

[0033] Figure 10 This is a schematic diagram of the position structure of the conductive spring and the conductive terminal when the pull rod of a low-voltage circuit breaker provided by the present invention is pulled;

[0034] Figure 11 This is a schematic cross-sectional structure diagram of a sliding block when a pull rod is pulled in a low-voltage circuit breaker provided by the present invention;

[0035] Figure 12 This is a schematic cross-sectional structure diagram of a sliding block of a low-voltage circuit breaker provided by the present invention in an initial state;

[0036] Figure 13 This is a schematic cross-sectional view of a local structure of a low-voltage circuit breaker provided by the present invention when a pull rod is pulled;

[0037] Figure 14 This is a schematic cross-sectional view of a local structure of a low-voltage circuit breaker in an initial state provided by the present invention;

[0038] Figure 15 The present invention provides a low voltage circuit breaker Figure 14 Enlarged structural diagram at point B in the middle.

[0039] In the figure: 1. Circuit breaker body; 2. Pull rod; 3. Sliding block; 4. Fixed baffle; 5. Positioning plate; 6. Movable block; 7. Upper rack; 8. Air bag; 9. Air storage chamber; 10. Mounting chamber; 11. Movable buckle; 12. Wiring terminal; 13. Guide rail; 21. Pull plate; 22. Limit pin; 23. Connecting bolt; 31. Connecting plate; 32. Sliding cavity; 33. Slide groove; 41. Fixed slider; 51. Push plate; 52. Spring; 61. Conductive terminal; 62. Conductive spring; 71. Lower rack; 72. Gear; 81. Air duct; 91. Sealing plug; 92. Organ cover; 111. Push rod; 231. Limit ring; 521. Mounting hole. DETAILED DESCRIPTION

[0040] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0041] Example 1, refer to Figures 1-10A low-voltage circuit breaker includes a circuit breaker body 1, a terminal 12 and a guide rail 13. A movable snap 11 is provided on the rear side of the circuit breaker body 1. The circuit breaker body 1 is slidably engaged with the guide rail 13 through the movable snap 11. A mounting cavity 10 is provided inside the circuit breaker body 1. A wiring port for inserting the terminal 12 is provided on the side wall of the circuit breaker body 1. The wiring port is communicated with the mounting cavity 10. A conductive spring 62 and a conductive terminal 61 are provided in the mounting cavity 10. The conductive spring 62 is fixedly installed in the mounting cavity 10. The conductive terminal 61 is slidably connected to the inner cavity of the mounting cavity 10. The conductive terminal 61 is matched with the terminal 12 to ensure that when the terminal 12 is inserted into the wiring port of the circuit breaker body 1, it can form good electrical contact with the conductive terminal 61. There is electrical contact between the conductive terminal 61 and the conductive spring 62. The conductive spring 62 has a certain elasticity and conductivity. When the conductive terminal 61 contacts the conductive spring 62, the elasticity of the spring can ensure that good contact pressure is maintained between the two, thereby ensuring the reliability of the electrical connection. The conductive spring 62 is electrically connected to the fixed contact of the circuit breaker body 1. The fixed contact is an important component inside the circuit breaker body 1. It is connected to the main circuit of the circuit breaker body 1 and plays the role of connecting or disconnecting the circuit. When the conductive spring 62 is well connected to the fixed contact, the entire circuit forms a path and current can pass freely. When the external circuit is connected to the conductive terminal 61 through the wiring terminal 12, the current can flow through the main circuit of the circuit breaker body 1 through the conductive terminal 61, the conductive spring 62 and the fixed contact, thereby realizing the circuit connection or disconnection function. It also includes:

[0042] Limiting card assembly: The limiting card assembly is arranged inside and outside the installation cavity 10. The limiting card assembly is used to connect the circuit breaker body 1 and the terminal 12, and can control the power-on state of the circuit breaker body 1;

[0043] Blocking assembly: The blocking assembly is arranged outside the circuit breaker body 1, and blocks the wiring port according to the state of the limit clamping assembly;

[0044] Clamping assembly: The clamping assembly is arranged in the blocking assembly, and the clamping assembly is used to clamp and fix the terminal blocks 12 of different specifications.

[0045] Furthermore, a lever 111 is fixedly installed in the lower end slot of the movable clip 11, and the front end of the lever 111 extends beyond the front side of the circuit breaker body 1. By pressing the lever 111, the movable clip 11 can be unlocked and disconnected from the guide rail 13. It can be operated even in a narrow space, which is more convenient than the existing technology.

[0046] The limiting clamping assembly includes a pull rod 2, a pull plate 21, a limiting pin 22, a connecting bolt 23, a positioning plate 5, a push plate 51 and a movable block 6. The positioning plate 5 is fixedly arranged inside the installation cavity 10, and the push plate 51 is slidingly connected to the installation cavity 10. The positioning plate 5 and the push plate 51 are cooperated. The rear end of the connecting bolt 23 is fixedly connected to the limiting ring 231. After the connecting bolt 23 passes through the positioning plate 5, it is clamped with the push plate 51 through the limiting ring 231. The positioning plate 5 and the push plate 51 are elastically connected by a spring 52. The positioning plate 5 is provided with a mounting hole 521 for the spring 52 to pass through, and the spring 52 is sleeved on the outside of the connecting bolt 23.

[0047] One end of the pull plate 21 is sleeved on the front end of the connecting bolt 23, and the other end is rotatably engaged with the pull rod 2 through the limit pin 22. A slot for the pull plate 21 to pass through is provided on the circuit breaker body 1. The end of the pull plate 21 extends beyond the front side of the circuit breaker body 1. By pulling the pull rod 2, the position of the connecting bolt 23 can be adjusted through the pull plate 21, and the position of the push plate 51 can be adjusted.

[0048] It should be noted that, since the pull rod 2 and the pull plate 21 are rotationally connected via the limit pin 22 , by applying force at different points, one can choose to pull the push plate 51 on one side or pull the push plates 51 on both sides simultaneously.

[0049] The outer wall of the push plate 51 is fixedly connected to the upper rack 7, and the side wall of the movable block 6 is fixedly connected to the lower rack 71. The upper rack 7 and the lower rack 71 are arranged on the same side, and a gear 72 is rotatably connected to the side wall of the mounting cavity 10 facing the upper rack 7. The upper rack 7 and the gear 72, and the lower rack 71 and the gear 72 are all meshed. When the push plate 51 moves, the upper rack 7 moves accordingly. Driven by the gear 72, the lower rack 71 and the upper rack 7 move toward each other. The movement of the lower rack 71 will drive the movable block 6 to move. The conductive terminal 61 is fixedly set on the movable block 6, and the conductive terminal 61 will move with the movable block 6.

[0050] It should be noted that, in the initial state, the side wall of the conductive terminal 61 is in contact with the conductive spring 62, and at this time, the connection terminal 12 is in contact with the conductive terminal 61 under the action of the push plate 51 (refer to 5 and Figure 9 ), at this time, the internal circuit of the circuit breaker is connected, and the terminal 12 can enter and exit the installation cavity 10 through the wiring port when the pull rod 2 is pulled, and there is a gap between the side wall of the conductive terminal 61 and the conductive spring 62 (refer to Figure 7 and Figure 10 ), at this time the internal circuit of the circuit breaker is disconnected.

[0051] In this embodiment, in the initial state (circuit connected), the conductive terminal 61 is in contact with the conductive spring 62: in the initial state, the side wall of the conductive terminal 61 is in close contact with the conductive spring 62. Since the conductive spring 62 has a certain elasticity and conductivity, this contact ensures a good electrical connection between the two. At this time, the spring 52 applies a forward thrust to the push plate 51. This thrust helps to maintain the contact between the push plate 51 and the terminal 12, as well as the contact between the conductive terminal 61 and the conductive spring 62.

[0052] Pull the pull rod 2 (circuit disconnected): When the user pulls the pull rod 2, the pull rod 2 is engaged with the rotation of the pull plate 21 through the limit pin 22, causing the pull plate 21 to move accordingly. The movement of the pull plate 21 will drive the connecting bolt 23 and the push plate 51 to move together. The movement of the push plate 51 will compress the spring 52 and change the position of the push plate 51 in the installation cavity 10. This movement process will release the thrust of the push plate 51 on the terminal block 12, allowing the terminal block 12 to enter and exit the installation cavity 10 through the wiring port when needed.

[0053] When the push plate 51 moves, the upper rack 7 also moves with it. The movement of the upper rack 7 is driven by the gear 72, driving the lower rack 71 to move toward the upper rack 7. The movement of the lower rack 71 drives the movable block 6 to move. The conductive terminal 61 is fixed to the movable block 6, so the conductive terminal 61 also moves with the movable block 6. As the conductive terminal 61 moves, the contact between its side wall and the conductive spring 62 is broken, and a gap is generated between the two. This gap causes the circuit to be disconnected, and the current can no longer flow through the conductive terminal 61, the conductive spring 62, and the fixed contact to the main circuit of the circuit breaker body 1.

[0054] When the circuit breaker needs to be replaced, after disconnecting the power supply, the wiring terminal 12 can be unlocked by pulling the pull rod 2. After pulling out the wiring terminal 12, the pull rod 2 is released, and then the movable buckle 11 can be unlocked by pressing the lever 111 to disconnect it from the guide rail 13. The old circuit breaker is removed from the guide rail 13 and a new circuit breaker is installed. By pulling the pull rod 2, the new wiring terminal 12 is inserted into the wiring port of the circuit breaker body 1, and then the pull rod 2 is released. At this time, with the cooperation of the spring 52, the gear 72 and the rack (upper rack 7 and lower rack 71), the wiring terminal 12 can be limited by the conductive terminal 61 and the push plate 51, so that the circuit breaker can be quickly replaced.

[0055] By pulling the pull rod 2 and pressing the lever 111, the terminal 12 and the movable buckle 11 can be quickly unlocked to achieve rapid replacement of the circuit breaker, which changes the wiring method of the existing circuit breaker. There is no need to remove the bolts, and the replacement can be easily completed even in a small cabinet space. At the same time, during the wiring process, the contact state between the conductive terminal 61 and the conductive spring 62 can also be changed, which ensures that the internal circuit is in a disconnected state before the new circuit breaker is installed and the circuit connection is re-established, further enhancing the safety of the operation.

[0056] Example 2, refer to Figure 4-10 The blocking assembly includes a sliding block 3 and a fixed baffle 4. The lower side wall of the sliding block 3 is fixedly connected to a connecting plate 31. The sliding block 3 is fixedly connected to the upper side wall of the push plate 51 through the connecting plate 31. When the push plate 51 moves, the sliding block 3 will move accordingly under the drive of the connecting plate 31. The fixed baffle 4 is fixedly connected to the circuit breaker body 1 and is arranged around the wiring port.

[0057] Furthermore, a groove is provided on one side of the sliding block 3 facing the wiring port for fixing the wiring terminal 12. The cross section of the fixed baffle 4 is U-shaped. The side wall of the sliding block 3 slides and fits with the inner wall of the fixed baffle 4. In the initial state, the sliding block 3 cooperates with the fixed baffle 4 to press the wiring terminal 12 on both sides (refer to Figure 9 ), at this time, under the action of the spring 52, the connection port can be blocked by the cooperation of the sliding block 3 and the fixed baffle 4, which reduces the probability of water vapor entering. At the same time, the upper end of the terminal 12 can be limited on both sides to avoid the terminal 12 from shaking easily when adjusting the position of the circuit breaker. The gap between the sliding block 3 and the fixed baffle 4 when the pull rod 2 is pulled is sufficient for the terminal 12 to pass through (refer to Figure 10 ), ensuring that the terminal block 12 can be smoothly inserted into the mounting cavity 10 at this time.

[0058] In this embodiment, when the push plate 51 moves inside the circuit breaker, the sliding block 3 will move accordingly, and the fixed baffle 4 is fixedly connected to the circuit breaker body 1 and is arranged around the wiring port to form a protective frame.

[0059] Initial state (refer to Figure 9), in the initial state, the sliding block 3 and the fixed baffle 4 fit tightly together to press the terminal 12 on both sides. This pressing not only helps to fix the terminal 12, but also prevents the terminal 12 from shaking or falling off when adjusting the position of the circuit breaker or performing other maintenance activities. The shaking terminal 12 may cause poor electrical connection or damage, thereby affecting the normal operation of the circuit breaker. At the same time, it also forms an effective blockage, reducing the risk of external factors such as water vapor entering the wiring port. This blocking mechanism is crucial for protecting the electrical connection inside the circuit breaker and preventing corrosion. Pollutants such as water vapor and dust may cause poor electrical connection or short circuit, thereby affecting the performance and reliability of the circuit breaker. At the same time, it can also prevent staff from accidentally touching it, reducing the risk of electric shock. A groove is provided on the side of the sliding block 3 facing the wiring port. The shape and size of this groove match the terminal 12, ensuring that the terminal 12 can be stably fixed when inserted.

[0060] When the lever 2 is pulled (refer to Figure 10 ), when the user needs to insert or remove the terminal block 12, the pull rod 2 is pulled, and this action drives the push plate 51 (and the sliding block 3 connected thereto) to move. As the sliding block 3 moves, the gap between it and the fixed block 4 will gradually increase. This gap is large enough for the terminal block 12 to pass through, thereby allowing the user to smoothly insert the terminal block 12 into the mounting cavity 10 or remove it from it.

[0061] During this process, due to the action of the spring 52, the push plate 51 (and the sliding block 3) will try to return to the initial position after moving. However, since the pull rod 2 is still being pulled, they will remain in a temporary position. Once the terminal 12 is inserted or removed, the user can release the pull rod 2. At this time, the spring 52 will push the push plate 51 (and the sliding block 3) back to the initial position, forming a tight fit with the fixed baffle 4 again to block the wiring port.

[0062] In summary, the design of the blocking assembly not only helps prevent poor electrical connection or damage caused by shaking or falling of the terminal 12, but also reduces the impact of external factors on the wiring port, while also preventing electric shock and improving the overall safety of the circuit breaker.

[0063] Example 3, refer to Figure 5-Figure 15The clamping assembly includes an airbag 8, a fixed slider 41 fixedly connected to the end of the fixed baffle 4 facing the sliding block 3, a sliding cavity 32, an air guide tube 81 and an air storage cavity 9 provided inside the sliding block 3. A placement groove is provided inside the groove on the sliding block 3, and the airbag 8 is fixedly provided in the placement groove. The side wall of the sliding block 3 is provided with a sliding groove 33 matching the fixed slider 41. A sealing plug 91 is installed on the fixed slider 41 located inside the sliding cavity 32. One end of the air guide tube 81 passes through the side wall of the sliding block 3 and the airbag 8, and the other end passes through the side wall of the fixed slider 41 and the sealing plug 91, away from the sealing plug 9 of the airbag 8. 1 is fixedly connected to the side wall of two accordion covers 92, and the ends of the accordion covers 92 are fixedly connected to the inner wall of the sliding block 3. The accordion covers 92 are located on the outside of the end of the air guide tube 81. The air storage chamber 9 is surrounded by the sealing plug 91, the two accordion covers 92 and the inner wall of the sliding block 3. When the sliding block 3 moves with the push plate 51, since the positions of the fixed slider 41 and the sealing plug 91 are fixed, the space inside the air storage chamber 9 will also change at this time. Specifically, the accordion covers 92 are in a compressed state in the initial state, and the internal space of the air storage chamber 9 is small. When the pull rod 2 is pulled, the accordion covers 92 are in an extended state, and the internal space of the air storage chamber 9 is larger.

[0064] It should be noted that the sealing plug 91, the accordion cover 92 and the inner cavity of the sliding block 3 are slidingly sealed to avoid gas leakage. The cross-section of the airbag 8 is U-shaped. When the pull rod 2 is pulled, the airbag 8 is in an unsaturated state, which reduces the friction on the airbag 8. The end of the air guide tube 81 close to the groove is fixedly connected to the inner wall of the sliding block 3, and the end of the air guide tube 81 away from the groove is slidingly sealed to the fixed slider 41 and the sealing plug 91. The end of the air guide tube 81 away from the groove is always inside the air storage chamber 9. The air storage chamber 9 It is connected to the airbag 8 through the air guide tube 81. When the internal space of the air storage chamber 9 changes, the state of the airbag 8 will also change accordingly. Pull the pull rod 2, the space of the air storage chamber 9 will become larger, and the airbag 8 will shrink. Release the pull rod 2, and it will gradually return to its initial state. The space of the air storage chamber 9 will become smaller, and the airbag 8 will swell. The setting of the swollen airbag 8 and the spring 52 can better match the terminal blocks 12 of different specifications, ensuring the fixing effect of the terminal blocks 12, and greatly reducing the occurrence of poor electrical connection or damage due to terminal shaking.

[0065] In this embodiment, the initial state: before the circuit breaker is operated, the clamping assembly is in the initial state. At this time, the sliding block 3 and the fixed baffle 4 are tightly matched to jointly press the two sides of the terminal 12.

[0066] The airbag 8 is U-shaped and fixed in the placement groove inside the groove of the sliding block 3. Since the accordion cover 92 is in a compressed state at this time, the internal space of the air storage chamber 9 is small, so the airbag 8 is inflated and in close contact with the terminal 12 to achieve initial fixation.

[0067] Pull the pull rod 2: When the user needs to insert or remove the terminal block 12, the pull rod 2 is pulled. This action drives the push plate 51 and the sliding block 3 connected thereto to move. Due to the design of the slide groove 33 between the fixed slider 41 and the sliding block 3, and the sliding sealing connection between the sealing plug 91 and the inner cavity of the sliding block 3, when the sliding block 3 moves, the positions of the fixed slider 41 and the sealing plug 91 remain fixed. As the sliding block 3 moves, the accordion cover 92 gradually extends, and the internal space of the air storage chamber 9 becomes larger. Since the air storage chamber 9 and the airbag 8 are connected through the air guide tube 81, the increase in the internal space of the air storage chamber 9 causes the gas in the airbag 8 to be extracted, and the airbag 8 therefore shrinks.

[0068] As the airbag 8 contracts, the gap between the sliding block 3 and the fixed baffle 4 gradually increases, providing sufficient space for the insertion or removal of the terminal 12. The user can smoothly insert the terminal 12 into the mounting cavity 10 or remove it from it without worrying about the operation being affected by the excessive friction resistance of the airbag 8.

[0069] Restore to the initial state: After the operation is completed, release the pull rod 2. At this time, the spring 52 will push the push plate 51 and the sliding block 3 back to the initial position. As the sliding block 3 moves, the accordion cover 92 is gradually compressed, and the internal space of the air storage chamber 9 becomes smaller. Due to the communication relationship between the air storage chamber 9 and the airbag 8, the reduction in the internal space of the air storage chamber 9 causes the airbag 8 to be re-inflated and bulged. The bulged airbag 8 works together with the spring 52 to firmly fix the terminal 12 again.

[0070] The clamping assembly can better match the terminal blocks 12 of different specifications through the expansion and contraction of the airbag 8 and the compression and release of the spring 52, ensuring the stable fixation of the terminal blocks 12. The user only needs to pull the pull rod 2 to easily insert or remove the terminal blocks 12 without using additional tools or force. The design of the clamping assembly effectively reduces the risk of poor electrical connection or damage caused by shaking of the terminal blocks 12, thereby improving the overall safety and reliability of the circuit breaker.

[0071] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0072] In the present invention, unless otherwise expressly specified or limited, terms such as "disposed," "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; they may refer to mechanical connections, direct connections, or indirect connections through an intermediate medium; they may refer to internal communication between two elements or interaction between two elements. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0073] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A low-voltage circuit breaker, comprising a circuit breaker body (1), a wiring terminal (12) and a guide rail (13), wherein a movable snap fastener (11) is provided on the rear side of the circuit breaker body (1), and the circuit breaker body (1) is slidably engaged with the guide rail (13) via the movable snap fastener (11), an installation cavity (10) is provided inside the circuit breaker body (1), and a wiring port for inserting the wiring terminal (12) is provided on the side wall of the circuit breaker body (1), and the wiring port is communicated with the installation cavity (10). , a conductive spring (62) and a conductive terminal (61) are provided in the installation cavity (10), the conductive spring (62) is fixedly installed in the installation cavity (10), the conductive terminal (61) is slidably connected to the inner cavity of the installation cavity (10), the conductive terminal (61) is matched with the wiring terminal (12), the conductive terminal (61) and the conductive spring (62) are electrically connected, and the conductive spring (62) is electrically connected to the fixed contact of the circuit breaker body (1), characterized in that, Also includes: Limiting clamping assembly: the limiting clamping assembly is arranged inside and outside the installation cavity (10); the limiting clamping assembly includes a pull rod (2), a pull plate (21), a limiting pin (22), a connecting bolt (23), a positioning plate (5), a push plate (51) and a movable block (6); the positioning plate (5) is fixedly arranged inside the installation cavity (10); the push plate (51) is slidably connected to the installation cavity (10); the positioning plate (5) and the push plate (51) are arranged in cooperation; the rear end of the connecting bolt (23) is fixedly connected to the limiting ring (231); the connecting bolt (23) passes through the positioning plate (5) and is clamped to the push plate (51) through the limiting ring (231); the positioning plate (5) and the push plate (51) are elastically connected by a spring (52); the positioning plate (5) is provided with a mounting hole (521) for the spring (52) to pass through; the spring (52) is sleeved on the outside of the connecting bolt (23); A blocking assembly: the blocking assembly is arranged outside the circuit breaker body (1); the blocking assembly comprises a sliding block (3) and a fixed baffle (4); the lower side wall of the sliding block (3) is fixedly connected to a connecting plate (31); the sliding block (3) is fixedly connected to the upper side wall of the push plate (51) via the connecting plate (31); the fixed baffle (4) is fixedly connected to the circuit breaker body (1) and is arranged around the wiring port; Clamping assembly: The clamping assembly is arranged in the blocking assembly.

2. A low voltage circuit breaker according to claim 1, characterized in that: A shift rod (111) is fixedly mounted in the notch at the lower end of the movable buckle (11), and the front end of the shift rod (111) extends beyond the front side of the circuit breaker body (1).

3. A low voltage circuit breaker according to claim 1, characterized in that: One end of the pull plate (21) is sleeved on the front end of the connecting bolt (23), and the other end is rotatably connected to the pull rod (2) through a limit pin (22). A notch for the pull plate (21) to pass through is provided on the circuit breaker body (1), and the end of the pull plate (21) extends beyond the front side of the circuit breaker body (1).

4. A low voltage circuit breaker according to claim 1, characterized in that: The outer wall of the push plate (51) is fixedly connected to an upper rack (7), and the side wall of the movable block (6) is fixedly connected to a lower rack (71). The upper rack (7) and the lower rack (71) are arranged on the same side, and a gear (72) is rotatably connected to the side wall of the mounting cavity (10) facing the upper rack (7). The upper rack (7) and the gear (72), as well as the lower rack (71) and the gear (72), are all meshedly connected. The conductive terminal (61) is fixedly arranged on the movable block (6).

5. The low voltage circuit breaker according to claim 1, characterized in that: In the initial state, the side wall of the conductive terminal (61) is in contact with the conductive spring (62), and at this time, the wiring terminal (12) is in contact with the conductive terminal (61) under the action of the push plate (51). When the pull rod (2) is pulled, the wiring terminal (12) can enter and exit the installation cavity (10) through the wiring port, and at this time, there is a gap between the side wall of the conductive terminal (61) and the conductive spring (62).

6. A low voltage circuit breaker according to claim 1, characterized in that: A groove is provided on one side of the sliding block (3) facing the wiring port, the cross section of the fixed baffle (4) is U-shaped, the side wall of the sliding block (3) is slidingly fitted with the inner wall of the fixed baffle (4), and the sliding block (3) and the fixed baffle (4) in the initial state cooperate to press the wiring terminal (12) on both sides, and when the pull rod (2) is pulled, the gap between the sliding block (3) and the fixed baffle (4) is sufficient for the wiring terminal (12) to pass through.

7. A low voltage circuit breaker according to claim 1, characterized in that: The clamping assembly comprises an airbag (8), a fixed slider (41) fixedly connected to the end of the fixed baffle (4) facing the sliding block (3), and a sliding cavity (32), an air guide tube (81) and an air storage cavity (9) provided inside the sliding block (3). A placement groove is provided inside the groove on the sliding block (3), and the airbag (8) is fixedly provided in the placement groove. A sliding groove (33) matching the fixed slider (41) is provided on the side wall of the sliding block (3). A sealing member is installed on the fixed slider (41) located inside the sliding cavity (32). The air duct (81) has one end that passes through the side wall of the sliding block (3) and the air bag (8), and the other end that passes through the side wall of the fixed slider (41) and the sealing plug (91). The side wall of the sealing plug (91) away from the air bag (8) is fixedly connected to two accordion covers (92). The ends of the accordion covers (92) are fixedly connected to the inner wall of the sliding block (3). The accordion covers (92) are located on the outside of the port of the air duct (81). The air storage cavity (9) is surrounded by the sealing plug (91), the two accordion covers (92) and the inner wall of the sliding block (3).

8. A low voltage circuit breaker according to claim 7, characterized in that: The sealing plug (91), the accordion cover (92) and the inner cavity of the sliding block (3) are connected in a sliding sealing manner. The cross-section of the airbag (8) is set in a U-shape. When the pull rod (2) is pulled, the airbag (8) is in an unsaturated state. The end of the air guide tube (81) close to the groove is fixedly connected to the inner wall of the sliding block (3). The end of the air guide tube (81) away from the groove is connected in a sliding sealing manner to the fixed slider (41) and the sealing plug (91). The end of the air guide tube (81) away from the groove is always inside the air storage cavity (9).

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