Low-voltage circuit breaker

Abstract

The invention provides a low-voltage circuit breaker, which belongs to the technical field of circuit breakers, and comprises a circuit breaker body, a wiring terminal, a guide rail, a limiting clamping assembly, a plugging assembly and a clamping assembly, by pulling the pull rod and pressing the deflector rod, the wiring terminal and the movable buckle can be rapidly unlocked, rapid replacement of the circuit breaker is achieved, and in the wiring process, an internal circuit of the circuit breaker is in a disconnected state; the protective frame formed by the sliding stop block and the fixed baffle plate and the bulging and contraction of the air bag jointly fix and block the wiring terminal, so that the influence of external factors such as water vapor and dust on the wiring port is reduced, the mistaken touch of workers is prevented, and the operation safety is further enhanced; the clamping assembly can be better matched with the wiring terminals of different specifications through the bulging and contraction of the air bag and the compression and release of the spring, the stability of the wiring terminals is ensured, and the risk of poor electrical connection or damage caused by the shaking of the wiring terminals is effectively reduced.

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 multiple electric energy monitoring elements such as current and voltage, and it is common to replace them when they are damaged. Most of the existing circuit breaker terminals are fixed with bolts, which requires professional tools and operating skills. When replacing the circuit breaker, the staff needs to frequently disassemble 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 the fixing treatment of the terminal, resulting in the terminal being prone to shaking when the circuit breaker is moved on the guide rail after installation. This shaking will cause unstable electrical connection and affect the 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 shortcomings, 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: The present invention provides a low-voltage circuit breaker, comprising a circuit breaker body, a wiring terminal and a guide rail, wherein a movable buckle is arranged at the rear side of the circuit breaker body, the circuit breaker body is slidably engaged with the guide rail through the movable buckle, an installation cavity is arranged inside the circuit breaker body, a wiring port for inserting the wiring terminal is arranged on the side wall of the circuit breaker body, the wiring port is communicated with the installation cavity, a conductive spring and a conductive terminal are arranged in the installation cavity, the conductive spring is fixedly installed in the installation cavity, the conductive terminal is slidably connected with the inner cavity of the installation cavity, the conductive terminal is matched with the wiring terminal, 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, and further comprises: Limiting clamping assembly: The limiting clamping assembly is arranged inside and outside the installation cavity, and is used to connect the circuit breaker body and the wiring terminal, and can control the power-on state of the circuit breaker body; 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; 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.

[0007] Preferably, a lever is fixedly installed in the notch at the lower end of the movable buckle, and the front end of the lever extends beyond the front side of the circuit breaker body.

[0008] 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. The push plate is slidably connected to the installation cavity. The positioning plate and the push plate are cooperatively arranged. The rear end of the connecting bolt is fixedly connected to a limit ring. After passing through the positioning plate, the connecting bolt is clamped with the push plate through the limit ring. The positioning plate and the push plate are elastically connected by a spring. The positioning plate is provided with a mounting hole for the spring to pass through, and the spring is sleeved on the outside of the connecting bolt.

[0009] 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.

[0010] Preferably, the outer 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 meshingly connected, and the conductive terminal is fixedly set on the movable block.

[0011] 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, and when the pull rod is pulled, the wiring terminal can enter and exit the installation cavity through the wiring port, and at this time there is a gap between the side wall of the conductive terminal and the conductive spring sheet.

[0012] Preferably, the blocking assembly includes a sliding block and a fixed baffle, the lower side wall of the sliding block is fixedly connected with 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.

[0013] 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, 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.

[0014] Preferably, the clamping assembly includes an airbag, a fixed sliding block fixedly connected to the end of the fixed baffle plate facing the sliding block, and a sliding cavity, an air duct and an air storage cavity arranged inside the sliding block; a placement groove is arranged 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 sliding block, a sealing plug is installed on the fixed sliding block located inside the sliding cavity, one end of the air duct passes through the side wall of the sliding block and the airbag, and the other end passes through the side wall of the fixed sliding block and the sealing plug, two accordion covers are fixedly connected to the side wall of the sealing plug away from the airbag, 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 duct port, and the air storage cavity is surrounded by the sealing plug, two accordion covers and the inner wall of the sliding block.

[0015] 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 duct close to the groove is fixedly connected to the inner wall of the sliding block, the end of the air duct away from the groove is slidingly sealed and connected to the fixed slider and the sealing plug, and the end of the air duct away from the groove is always inside the air storage cavity.

[0016] The beneficial effects of the present invention are: By pulling the pull rod and pressing the lever, the user can quickly unlock the terminal blocks and movable buckles to achieve rapid replacement of circuit breakers. This design does not require the removal of bolts and operating tools, and can easily complete the replacement operation even in a compact 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.

[0017] The protective frame formed by the sliding block and the fixed baffle, as well as the expansion 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 blocks, while also preventing workers from accidentally touching them, further enhancing the safety of operation; the clamping assembly can better match terminal blocks of different specifications through the expansion and contraction of the airbag, as well as the compression and release of the spring, to ensure 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

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 This is a schematic diagram of the overall structure of a low-voltage circuit breaker provided by the present invention; Figure 2 This is a structural schematic diagram of a low-voltage circuit breaker provided by the present invention during installation; Figure 3 It is a schematic diagram of a low-voltage circuit breaker lever structure provided by the present invention; Figure 4 It is a schematic diagram of a cross-sectional structure of a low-voltage circuit breaker provided by the present invention; Figure 5 It is a schematic cross-sectional structure diagram of a low-voltage circuit breaker installation cavity provided by the present invention; Figure 6 The present invention provides a low voltage circuit breaker Figure 5 The enlarged structural diagram at A in the middle; Figure 7 It is a structural schematic diagram of a low-voltage circuit breaker provided by the present invention when a pull rod is pulled; Figure 8 It is a structural schematic diagram of a low-voltage circuit breaker provided by the present invention in an initial state; Fig. 9 It is a schematic diagram of the position structure of a conductive spring and a conductive terminal of a low-voltage circuit breaker in an initial state provided by the present invention; Fig.10 It is a schematic diagram of the position structure of a conductive spring piece and a conductive terminal when a pull rod is pulled in a low-voltage circuit breaker provided by the present invention; Fig.11 It is a schematic diagram of the cross-sectional structure of a sliding stopper when a pull rod is pulled in a low-voltage circuit breaker provided by the present invention; Fig.12 It is a schematic diagram of the cross-sectional structure of a sliding stopper in an initial state of a low-voltage circuit breaker provided by the present invention; Fig.13 It 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; Fig.14 It is a schematic diagram of a partial structural cross-section of a low-voltage circuit breaker provided by the present invention in an initial state; Fig.15 The present invention provides a low voltage circuit breaker Fig.14 Enlarged structural diagram at B in the middle.

[0020] 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. installation 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. accordion cover; 111. lever; 231. limit ring; 521. installation hole. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, 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 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 creative work are within the scope of protection of the present invention.

[0022] Embodiment 1, refer to Figure 1-Figure 10A low-voltage circuit breaker comprises a circuit breaker body 1, a terminal 12 and a guide rail 13. A movable buckle 11 is arranged at 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 buckle 11. An installation cavity 10 is arranged inside the circuit breaker body 1. A wiring port for inserting the terminal 12 is arranged on the side wall of the circuit breaker body 1. The wiring port is communicated with the installation cavity 10. A conductive spring 62 and a conductive terminal 61 are arranged 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 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. The conductive terminal 61 and the conductive spring 62 are electrically conductive. The conductive spring 62 has certain elasticity and conductivity. When the conductive terminal 61 contacts the conductive spring 62, the elasticity of the spring can ensure that the two maintain a good contact pressure, 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 a role in connecting or disconnecting the circuit. When the conductive spring 62 is well connected to the fixed contact, the entire circuit forms a path, and the 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, and also includes: Limiting clamping assembly: The limiting clamping assembly is arranged inside and outside the installation cavity 10, and the limiting clamping assembly is used to connect the circuit breaker body 1 and the wiring terminal 12, and can control the power-on state of the circuit breaker body 1; Blocking component: The blocking component is arranged outside the circuit breaker body 1, and blocks the wiring port according to the state of the limit clamping component; Clamping assembly: The clamping assembly is arranged in the blocking assembly, and the clamping assembly is used to clamp and fix the wiring terminals 12 of different specifications.

[0023] Furthermore, a lever 111 is fixedly installed in the groove at the lower end of the movable buckle 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 buckle 11 can be unlocked to disconnect it from the guide rail 13. It can be operated even in a small space, which is more convenient than the prior art.

[0024] 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 slidably connected to the installation cavity 10. The positioning plate 5 and the push plate 51 are cooperatively arranged. 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 outer side of the connecting bolt 23.

[0025] 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 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 then the position of the push plate 51 can be adjusted.

[0026] It should be noted that, since the pull rod 2 and the pull plate 21 are rotatably 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 at the same time.

[0027] The outer wall of the push plate 51 is fixedly connected with an upper rack 7, and the side wall of the movable block 6 is fixedly connected with 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. 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.

[0028] 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 connecting terminal 12 is in contact with the conductive terminal 61 under the action of the push plate 51 (refer to 5 and Fig. 9 ), at this time, the internal circuit of the circuit breaker is connected, and 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 (refer to Figure 7 and Fig.10 ), at this time the internal circuit of the circuit breaker is disconnected.

[0029] 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 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, and 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.

[0030] Pull the pull rod 2 (circuit disconnected): When the user pulls the pull rod 2, the pull rod 2 is engaged with the pull plate 21 through the rotation of the limit pin 22, so that the pull plate 21 moves 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 12, allowing the terminal 12 to enter and exit the installation cavity 10 through the wiring port when needed.

[0031] When the push plate 51 moves, the upper rack 7 will also move accordingly. The movement of the upper rack 7 drives the lower rack 71 and the upper rack 7 to move toward each other through the transmission of the gear 72. The movement of the lower rack 71 will drive the movable block 6 to move, and the conductive terminal 61 is fixedly arranged on the movable block 6. Therefore, the conductive terminal 61 will also move 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 main circuit of the circuit breaker body 1 through the conductive terminal 61, the conductive spring 62 and the fixed contact.

[0032] 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.

[0033] By pulling the pull rod 2 and pressing the lever 111, the terminal 12 and the movable buckle 11 can be quickly unlocked to realize the 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 space in the cabinet. 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.

[0034] Example 2, refer to Figure 4-Figure 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 with 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.

[0035] Furthermore, a groove is provided on one side of the sliding block 3 facing the wiring port to fix the wiring terminal 12. The cross section of the fixed baffle 4 is U-shaped, and the side wall of the sliding block 3 is slidably fitted with the inner wall of the fixed baffle 4. The sliding block 3 and the fixed baffle 4 in the initial state cooperate to press the wiring terminal 12 on both sides (refer to Fig. 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, reducing 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 Fig.10 ), ensuring that the wiring terminal 12 can be smoothly inserted into the mounting cavity 10 at this time.

[0036] 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.

[0037] Initial state (refer to Fig. 9), in the initial state, the sliding block 3 and the fixed baffle 4 are tightly matched to jointly 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 essential for protecting the internal electrical connection of the circuit breaker and preventing corrosion. Contaminants 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 the groove match the terminal 12, ensuring that the terminal 12 can be stably fixed when inserted.

[0038] When the lever 2 is pulled (refer to Fig.10 ), when the user needs to insert or unplug the terminal 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 baffle 4 will gradually increase. This gap is large enough for the terminal 12 to pass through, thereby allowing the user to smoothly insert the terminal 12 into the installation cavity 10 or unplug it therefrom.

[0039] In 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 pulled out, 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, and form a tight fit with the fixed baffle 4 again to block the wiring port.

[0040] In summary, the design of the blocking component not only helps prevent poor electrical connection or damage caused by shaking or falling off 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.

[0041] 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 arranged inside the sliding block 3, a placement groove is arranged inside the groove on the sliding block 3, and the airbag 8 is fixedly arranged in the placement groove, and a sliding groove 33 matching the fixed slider 41 is opened on the side wall of the sliding block 3, and 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, and the sealing plug 91 is far away from the airbag 8. 1 has two accordion covers 92 fixedly connected to the side wall thereof, 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 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 in the initial state are in a compressed 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 large.

[0042] It should be noted that the sealing plug 91, the bellows cover 92 and the inner cavity of the sliding block 3 are slidingly sealed to prevent 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 an air guide tube 81, so 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 becomes larger, and the airbag 8 shrinks. Release the pull rod 2 and gradually restore the initial state. The space of the air storage chamber 9 becomes smaller, and the airbag 8 swells. The setting of the swollen airbag 8 and the spring 52 can better match the wiring terminals 12 of different specifications, ensure the fixing effect of the wiring terminals 12, and greatly reduce the occurrence of poor electrical connection or damage due to terminal shaking.

[0043] In this embodiment, the initial state: before the circuit breaker is operated, the clamping assembly is in the initial state, at which time the sliding stopper 3 and the fixed stopper 4 are tightly matched to press the connection terminal 12 on both sides.

[0044] 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 bulged, and is in close contact with the terminal 12 to achieve preliminary fixation.

[0045] Pull the pull rod 2: When the user needs to insert or unplug the terminal 12, the pull rod 2 will be pulled. This action will drive 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. With the movement of the sliding block 3, the accordion cover 92 gradually extends, and the internal space of the air storage chamber 9 becomes larger. Since the air storage chamber 9 is connected to the air bag 8 through the air guide tube 81, the increase in the internal space of the air storage chamber 9 causes the gas in the air bag 8 to be extracted, and the air bag 8 shrinks.

[0046] 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 installation cavity 10 or remove it from it without worrying about the operation being affected by the excessive friction resistance of the airbag 8.

[0047] 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 connectivity 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.

[0048] The clamping assembly can better match the wiring terminals 12 of different specifications through the inflation and contraction of the airbag 8 and the compression and release of the spring 52, thereby ensuring the stable fixation of the wiring terminals 12. The user only needs to pull the pull rod 2 to easily insert or remove the wiring terminals 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 the shaking of the wiring terminals 12, thereby improving the overall safety and reliability of the circuit breaker.

[0049] 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 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, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0050] In the present invention, unless otherwise clearly specified and limited, the terms "set", "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0051] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope 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 buckle (11) is arranged 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 buckle (11), an installation cavity (10) is arranged inside the circuit breaker body (1), and a wiring port for inserting the wiring terminal (12) is arranged on the side wall of the circuit breaker body (1), and the wiring port is connected to the installation cavity (10). The mounting cavity (10) is provided with a conductive spring sheet (62) and a conductive terminal (61); the conductive spring sheet (62) is fixedly mounted 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 wiring terminal (12); the conductive terminal (61) and the conductive spring sheet (62) are electrically connected; the conductive spring sheet (62) and the fixed contact of the circuit breaker body (1) are electrically connected; and the characteristic is that: Also includes: Position-limiting clamping assembly: the position-limiting clamping assembly is arranged inside and outside the installation cavity (10); Blocking assembly: the blocking assembly is arranged outside the circuit breaker body (1); 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 lever (111) is fixedly mounted in a notch at the lower end of the movable buckle (11), and a front end of the lever (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: The limit clamping assembly comprises a pull rod (2), a pull plate (21), a limit 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 a limit ring (231); the connecting bolt (23) passes through the positioning plate (5) and is clamped with the push plate (51) through the limit ring (231); the positioning plate (5) and the push plate (51) are elastically connected via a spring (52); a mounting hole (521) for the spring (52) to pass through is provided on the positioning plate (5); and the spring (52) is sleeved on the outer side of the connecting bolt (23).

4. A low voltage circuit breaker according to claim 3, 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 engaged with the pull rod (2) via a limit pin (22); a notch for the pull plate (21) to pass through is provided on the circuit breaker body (1), and an end of the pull plate (21) extends beyond the front side of the circuit breaker body (1).

5. A low voltage circuit breaker according to claim 3, characterized in that: An upper rack (7) is fixedly connected to the outer wall of the push plate (51), and a lower rack (71) is fixedly connected to the side wall of the movable block (6). 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 meshedly connected, and the conductive terminal (61) is fixedly arranged on the movable block (6).

6. A low voltage circuit breaker according to claim 5, characterized in that: In the initial state, the side wall of the conductive terminal (61) is in contact with the conductive spring sheet (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 sheet (62).

7. A low voltage circuit breaker according to claim 3, characterized in that: 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); and the fixed baffle (4) is fixedly connected to the circuit breaker body (1) and is arranged around the wiring port.

8. A low voltage circuit breaker according to claim 7, 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.

9. A low voltage circuit breaker according to claim 8, characterized in that: The clamping assembly comprises an airbag (8), a fixed slide block (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) arranged inside the sliding block (3); a placement groove is arranged inside the groove on the sliding block (3), and the airbag (8) is fixedly arranged in the placement groove; a sliding groove (33) matching the fixed slide block (41) is opened on the side wall of the sliding block (3); a sealing member is installed on the fixed slide block (41) located inside the sliding cavity (32) The air guide tube (81) has one end that penetrates the sliding block (3) and the side wall of the air bag (8), and the other end that penetrates the fixed slider (41) and the side wall of 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 guide tube (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).

10. A low voltage circuit breaker according to claim 9, characterized in that: The sealing plug (91), the accordion cover (92) and the inner cavity of the sliding block (3) are slidably sealed and connected. 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. 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 slidably sealed and connected 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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