A single-phase fire current limiter

Abstract

This application discloses a single-phase fireproof current limiter, relating to the technical field of current limiters. It includes a current limiter body with a plug-in slot; a connecting post plugged into the plug-in slot; a limiting ring disposed at one end of the connecting post, the limiting ring having a wire core hole; a clamping plate with a driving surface; an electrical connecting ring with an electrical connecting hole on the current limiter body; the sidewall of the electrical connecting ring sliding on the driving surface, driving the clamping plate to flip and clamp a metal wire core, at which point the metal wire core forms an electrical connection with the electrical connecting ring through the clamping plate; a control ring; a snap-fit ​​strip with a snap-fit ​​groove on the current limiter body; a driving assembly that, when the snap-fit ​​strip is aligned with the snap-fit ​​groove and the control ring is close to the limiting ring, drives the snap-fit ​​strip radially into the snap-fit ​​groove; and an elastic driving member on the connecting post that, when the control ring moves away from the limiting ring, drives the snap-fit ​​strip away from the snap-fit ​​groove. This application facilitates the connection of electrical wires.

Description

Technical Field

[0001] The present application relates to the technical field of current limiters, and in particular to a single-phase fire-proof current limiter. Background Art

[0002] The single-phase fire-proof current limiter is an electrical protection device widely used in power systems. It is a device that can limit the current value in the circuit when it exceeds the rated current to prevent faults such as overload or short circuit, thereby ensuring the safety of electrical appliances.

[0003] At present, the prior art discloses a single-phase fire current limiter, including a shell, with wire ports formed on opposite sides of the shell, and fixing screws corresponding to the wire ports are threadedly connected on the shell. When installing, the insulation layer on the wire is first stripped off to expose the metal wire core, and then the metal wire core of the wire is inserted into the wire port, and then the fixing screw is turned to fix the metal wire core and realize electrical connection at the same time.

[0004] However, when connecting wires, it is difficult to control the stripping length of the insulation layer. When the stripping length of the insulation layer is short, the exposed metal wire core is not long enough, and it is easy to abut against the insulation layer of the wire when fixing, resulting in poor electrical connection, which requires reconnection. Summary of the invention

[0005] In order to facilitate the connection of electric wires, the present application provides a single-phase fire-proof current limiter.

[0006] The present application provides a single-phase fire current limiter, which adopts the following technical solution:

[0007] A single-phase fire current limiter, comprising

[0008] A current limiter body, wherein two opposite sides of the current limiter body are respectively formed with plug-in slots;

[0009] A connecting column is plugged into the plug slot, and the connecting column is formed with a through hole for the power line to pass through;

[0010] A limiting ring is arranged at one end of the connecting column and blocks the penetration hole, and the limiting ring is formed with a wire core hole for the exposed metal wire core to pass through;

[0011] A clamping plate, hinged to the limiting ring, the clamping plates are multiple and arranged around the wire core hole in the circumferential direction, and the clamping plate is inclined to form a driving surface on one side facing away from the wire core hole;

[0012] The current limiter body is provided with an electrical connection ring located in the plug-in slot, and the electrical connection ring is formed with an electrical connection hole for the clamping plate to be inserted;

[0013] The side wall of the electrical connection ring slides on the driving surface, driving the clamping plate to flip and clamp the metal wire core, and at this time the metal wire core forms an electrical connection with the electrical connection ring through the clamping plate;

[0014] A control ring, sleeved on the outer peripheral side of the connecting column, the control ring is threadedly connected to the connecting column;

[0015] A clamping strip is radially slidable on the connecting column, and the flow limiter body is formed with a clamping groove located on the wall of the plug-in groove;

[0016] A driving assembly is arranged on the connecting column, and when the clamping strip is aligned with the clamping groove and the control ring is close to the limiting ring, the driving assembly drives the clamping strip to clamp into the clamping groove in a radial direction;

[0017] The connecting column is provided with an elastic driving member, and when the control ring moves away from the limiting ring, the elastic driving member drives the clamping strip to move away from the clamping groove.

[0018] By adopting the above technical solution, the plug-in design of the plug-in slot on the current limiter body and the connecting column makes installation and disassembly simple and quick. The through holes and limiting rings on the connecting column, combined with the flip clamping mechanism of the clamping plate, ensure a stable electrical connection between the metal wire core and the electrical connection ring, while reducing the risk of fire caused by poor contact. The threaded connection between the control ring and the connecting column, as well as the cooperation between the clamping strip and the clamping slot, further enhance the stability and safety of the connection. When the control ring is close to the limiting ring, the drive assembly automatically drives the clamping strip to snap into the clamping slot for quick locking; and when the control ring is away from the limiting ring, the elastic drive member drives the clamping strip out of the clamping slot for easy disassembly. This design not only improves work efficiency, but also significantly enhances the safety and reliability of the fire-proof current limiter.

[0019] Optionally, the driving assembly includes a driving bar, a driving column, a transmission column and a driving ring;

[0020] The driving strip slides axially on the connecting column and corresponds to the clamping strip one by one. The driving ring slides axially on the outer peripheral side of the connecting column, and the driving ring is connected to the driving strip.

[0021] The transmission column slides up and down on the connecting column and is arranged on the side of the driving bar close to the clamping bar. The driving column is arranged on the clamping bar and slides radially on the connecting column.

[0022] The driving column is inclined to form a pushing surface on one side away from the clamping strip. When the driving ring approaches the clamping strip, the driving column slides on the pushing surface, and at this time, the clamping strip is away from the driving column.

[0023] By adopting the above technical solution, the driving assembly includes a driving strip, a driving column, a transmission column and a driving ring. This design makes the driving process of the card strip more accurate and efficient. When the driving ring slides along the axial direction, the radial movement of the card strip can be accurately controlled through the interaction between the transmission column and the driving column, thereby ensuring that the card strip can be accurately inserted into or out of the card slot. This design not only simplifies the operation process, but also improves the durability and stability of the equipment.

[0024] Optionally, a limiting block is provided on the outer wall of the driving column, and a limiting groove is formed on the connecting column for the limiting block to slide.

[0025] By adopting the above technical solution, a limiting block is set on the outer wall of the driving column, and a limiting groove is formed on the connecting column. This design effectively limits the radial movement range of the driving column and reduces damage or failure caused by excessive movement. At the same time, the cooperation between the limiting block and the limiting groove also enhances the stability of the driving column, making the entire driving process more stable and reliable.

[0026] Optionally, the elastic driving member includes a driving spring, and the driving spring is arranged in the limiting groove, and the driving spring drives the limiting block to approach the transmission column.

[0027] By adopting the above technical solution, when the control ring is away from the limiting ring, the driving spring can automatically drive the limiting block to approach the transmission column, thereby driving the clamping strip away from the clamping slot. This design not only simplifies the driving mechanism, but also improves the automation and response speed of the equipment. At the same time, the elastic force of the driving spring also ensures the stability and reliability of the clamping strip when it is separated from the clamping slot.

[0028] Optionally, the transmission column includes an inner column, an outer column and a connecting spring;

[0029] The outer column is arranged on the driving bar, the inner column slides up and down on the outer column, the connecting spring is arranged in the outer column, and the connecting spring drives the inner column to protrude to the outer column.

[0030] By adopting the above technical solution, the transmission column adopts a combined structure of an inner column, an outer column and a connecting spring. This design enables the clamping strip to slide into the connecting column when the connecting column is inserted into the plug-in slot.

[0031] Optionally, the connecting column is formed with a sliding groove for the driving bar to slide up and down, and the vertical side walls on the opposite sides of the outer column are in sliding contact with the opposite groove walls of the sliding groove respectively;

[0032] A blocking strip that slides up and down on the connecting post is arranged on the side of the driving strip facing away from the driving post, and the vertical side walls of the blocking strip on the opposite side are in sliding contact with the walls of the sliding slot respectively.

[0033] By adopting the above technical solution, the connecting column is provided with a slide groove and a blocking strip. This design enables the driving strip to maintain a stable trajectory when sliding up and down, thereby reducing the possibility of impurities entering the penetration hole through the slide groove.

[0034] Optionally, the connecting column is provided with a fixed plate located in the sliding groove and corresponding to each other one by one, and the fixed plate is symmetrically arranged up and down and is hinged with a connecting strip;

[0035] A side of the connecting bar away from the fixing plate is respectively hinged to the driving bar and the connecting column;

[0036] When the driving strip approaches the clamping strip, the fixing plate approaches the electric wire in the radial direction;

[0037] When the driving bar moves away from the clamping bar, the fixing plate moves away from the electric wire in the radial direction.

[0038] By adopting the above technical solution, when the driving bar is close to the clamping bar, the fixing plate will radially approach the wires, thereby enhancing the support and protection of the wires; and when the driving bar is away from the clamping bar, the fixing plate will radially move away from the wires to facilitate disassembly operations.

[0039] Optionally, the clamping strip is inclined to form a sliding surface on one side facing away from the control ring, and the insertion slot wall slides on the sliding surface to guide the clamping strip to slide into the clamping slot.

[0040] By adopting the above technical solution, the snap-in strip is inclined toward the side of the control ring to form a sliding surface. This design enables the snap-in strip to be guided by the wall of the insertion slot when sliding into the snap-in slot, thereby completing the snap-in action more smoothly and accurately.

[0041] Optionally, the limiting ring is inclined to form a guiding surface surrounding the wire core hole.

[0042] By adopting the above technical solution, the limiting ring is tilted to form a guide surface surrounding the wire core hole. This design allows the metal wire core to be guided by the guide surface when inserted into the wire core hole, so that the insertion action can be completed more smoothly and accurately. This design not only improves the ease of use and reliability of the device, but also reduces the risk of damage or failure caused by improper insertion.

[0043] Optionally, a limit strip is provided on a side of the limit ring facing away from the control ring, and the limit strip abuts against the driving surface.

[0044] By adopting the above technical solution, a limit strip is set on the side of the limiting ring facing away from the control ring. This design is conducive to maintaining the state of the clamping plate, making it convenient for the clamping plate to be inserted into the electrical connection hole when the connecting column is inserted into the plug-in slot located below.

[0045] In summary, the present application includes at least one of the following beneficial effects:

[0046] 1. The plug-in design of the plug-in slot on the current limiter body and the connecting column makes installation and removal simple and quick. The through-holes and limiting rings on the connecting column, combined with the flip clamping mechanism of the clamping plate, ensure a stable electrical connection between the metal wire core and the electrical connection ring, while reducing the risk of fire caused by poor contact;

[0047] 2. When the driving bar is close to the clamping bar, the fixing plate will be close to the wires in radial direction, thereby enhancing the support and protection of the wires. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 is a schematic diagram of the external structure of an embodiment of the present application;

[0049] Figure 2 is a schematic diagram of an internal cross-section of an embodiment of the present application;

[0050] Figure 3 yes Figure 2 A magnified schematic diagram of part A;

[0051] Figure 4 yes Figure 2 A magnified schematic diagram of part B;

[0052] Figure 5 yes Figure 2 Enlarged schematic diagram of part C of FIG.

[0053] Figure numerals: 1. current limiter body; 11. plug-in slot; 12. electrical connection ring; 121. electrical connection hole; 13. snap-in slot; 2. connecting column; 21. penetration hole; 22. control ring; 23. snap-in strip; 231. sliding surface; 24. limiting slot; 25. slide slot; 26. fixing plate; 27. connecting strip; 3. limiting ring; 31. clamping plate; 311. driving surface; 32. guiding surface; 33. limiting strip; 34. wire core hole; 4. driving ring; 41. driving strip; 411. blocking strip; 42. driving column; 421. pushing surface; 422. limiting block; 43. transmission column; 431. inner column; 432. outer column; 433. connecting spring; 5. driving spring. DETAILED DESCRIPTION

[0054] The following is combined with Figure 1-5 This application is described in further detail.

[0055] The embodiment of the present application discloses a single-phase fire current limiter.

[0056] See also Figure 1The single-phase fire-proof current limiter includes a current limiter body 1, which serves as a supporting base for the entire device. Plug-in slots 11 are respectively formed on the top and bottom side walls of the current limiter body 1, and the number of the plug-in slots 11 is adapted to the circuit design requirements of the neutral wire, the live wire, etc.

[0057] See also Figure 2 and Figure 3 The single-phase fire current limiter also includes a connecting column 2 and a limiting ring 3. There are multiple connecting columns 2 and they correspond to the plug-in slots 11 one by one. The connecting column 2 is plugged into the plug-in slot 11. A through hole 21 is formed in the middle of the connecting column 2 along the axial direction. The central axis of the through hole 21 is coaxially arranged with the central axis of the connecting column 2. The through hole 21 allows the wire to pass through, which is convenient for subsequent connection operations.

[0058] See also Figure 3 and Figure 4 The limiting ring 3 is installed and fixed at one end of the connecting column 2, and the limiting ring 3 blocks the opening of one side of the penetration hole 21. A wire core hole 34 is formed in the middle of the limiting ring 3, and the central axis of the wire core hole 34 coincides with the central axis of the penetration hole 21. The diameter of the wire core hole 34 is larger than the diameter of the metal wire core, and the diameter of the wire core hole 34 is smaller than the diameter of the wire. A guide surface 32 is formed obliquely on the side of the limiting ring 3 close to the connecting column 2, and the guide surface 32 surrounds the wire core hole 34. When passing through the penetration hole 21, the metal wire core of the wire slides on the guide surface 32, guiding the metal wire core to enter the wire core hole 34 until the outer insulation layer of the wire abuts against the guide surface 32, thereby limiting the position of the wire.

[0059] Furthermore, a clamping plate 31 is hingedly provided on the side of the limiting ring 3 facing away from the connecting column 2. There are multiple clamping plates 31 and they are evenly spaced circumferentially arranged with the central axis of the wire core hole 34 as the center. The clamping plates 31 can be flipped towards or away from the wire core hole 34.

[0060] The clamping plate 31 is inclined to form a driving surface 311 on one side facing away from the wire core hole 34. The current limiter body 1 is fixed with an electrical connection ring 12, which is located in the plug-in slot 11 and corresponds one to one. An electrical connection hole 121 is formed in the middle of the electrical connection ring 12. When the connecting column 2 is inserted into the plug-in slot 11, the clamping plate 31 is inserted into the electrical connection hole 121. At this time, the side wall of the electrical connection ring 12 slides on the driving surface 311, pushing the clamping plate 31 to flip toward the direction close to the central axis of the wire core hole 34 until the clamping plates 31 cooperate with each other to clamp the metal wire core, ensuring the stable clamping of the metal wire core and realizing a reliable electrical connection between the metal wire core and the electrical connection ring 12.

[0061] At the same time, the limiting ring 3 is fixedly connected to the side facing away from the control ring 22, the limiting strip 33 corresponds to the clamping plate 31 one by one, and the limiting strip 33 abuts against the driving surface 311, which is beneficial to maintaining the state of the clamping plate 31 and facilitating the insertion of the clamping plate 31 into the electrical connection hole 121 when the connecting column 2 is inserted into the plug-in slot 11 below.

[0062] See also Figure 4 and Figure 5 The single-phase fire current limiter also includes a control ring 22, a clamping strip 23 and a drive assembly. The clamping strip 23 is an arc-shaped strip structure. The clamping strip 23 slides radially on the connecting column 2 and is close to the limiting ring 3 (the limiting ring 3 is Figure 3 As indicated in the figure), there are a plurality of clamping strips 23 which are evenly spaced apart along the circumferential direction.

[0063] The control ring 22 is sleeved on the outer peripheral side of the connecting column 2, and the control ring 22 is threadedly connected to the connecting column 2. Such a design allows the control ring 22 to move precisely along the axial direction of the connecting column 2. The driving assembly is arranged on the connecting column 2, and the driving assembly includes a driving bar 41, a driving column 42, a transmission column 43 and a driving ring 4.

[0064] A slide groove 25 extending in the vertical direction is formed on the connecting column 2, and the slide groove 25 is connected to the through hole 21. There are multiple slide grooves 25 and they are evenly spaced along the circumference. The slide groove 25 is located between the control ring 22 and the clamping strip 23, and the slide groove 25 corresponds to the clamping strip 23 one by one.

[0065] The driving strip 41 is located in the slide slot 25, and the driving strip 41 is slidably connected to the slide slot 25 up and down, and the vertical side walls of the driving strip 41 opposite to each other are in sliding contact with the vertical side walls of the slide slot 25 opposite to each other. The driving ring 4 is slidably sleeved on the outer peripheral side wall of the connecting column 2, and the driving ring 4 is fixedly connected to the driving strip 41, and the driving ring 4 can drive the driving strip 41 to move axially along the connecting column 2. When the driving ring 4 moves in the axial direction, it drives the driving strip 41 to move together, thereby realizing the control of the clamping strip 23.

[0066] The transmission column 43 slides axially on the connecting column 2, and the transmission column 43 is fixed on the side of the driving bar 41 close to the clamping bar 23. The driving column 42 is fixed on the arc-shaped concave side of the clamping bar 23 and corresponds one to one. The driving column 42 slides radially on the connecting column 2, and a push surface 421 is formed on the side of the driving column 42 close to the central axis of the connecting column 2. When the control ring 22 rotates to approach the clamping bar 23, the control ring 22 abuts against the driving ring 4 and drives the driving ring 4 close to the clamping bar 23. At this time, the connecting bar 27 drives the transmission column 43 to slide in the direction of the clamping bar 23; then the driving column 42 slides on the push surface 421, so that the transmission column 43 pushes the driving column 42 to slide in the direction away from the central axis of the connecting column 2, and at this time, the clamping bar 23 protrudes out of the connecting column 2.

[0067] A limiting block 422 is fixedly connected to the outer peripheral side wall of the driving column 42, and a limiting groove 24 extending radially is formed in the connecting column 2. The limiting block 422 slides in the limiting groove 24 to limit the movement trajectory of the driving column 42 and reduce the possibility of the driving column 42 detaching from the connecting column 2.

[0068] The connecting column 2 is provided with an elastic driving member, which is a driving spring 5. The driving spring 5 corresponds to the limiting groove 24 one by one and is installed in the limiting groove 24. One end of the driving spring 5 abuts against the side of the limiting block 422 close to the clamping strip 23, and the other end abuts against the groove wall of the limiting groove 24. When the transmission column 43 moves away from the driving column 42, the driving spring 5 is elastically released, and the driving spring 5 pushes the driving column 42 to move toward the central axis direction of the connecting column 2 through the limiting block 422, so that the clamping strip 23 slides into the connecting column 2.

[0069] The transmission column 43 includes an inner column 431, an outer column 432 and a connecting spring 433. The outer column 432 is fixed to the side of the driving bar 41 close to the clamping bar 23. The vertical side walls of the outer column 432 on opposite sides are in sliding contact with the vertical side walls on opposite sides of the slide groove 25 respectively. The driving bar 41 is fixedly connected to the side facing away from the outer column 432 with a blocking bar 411. The blocking bar 411 slides up and down on the connecting column 2, and the vertical side walls of the blocking bar 411 on opposite sides are in sliding contact with the vertical side walls on the opposite side of the slide groove 25 respectively, which can reduce the possibility of impurities entering the penetration hole 21 through the slide groove 25.

[0070] A transmission groove is formed in the middle of the outer column 432, which extends to the outside in a direction away from the driving bar 41, and the inner column 431 slides up and down in the transmission groove. A stopper is fixedly connected to the outer wall of the inner column 431, and a stopper groove for the stopper to slide is formed on the wall of the transmission groove, thereby limiting the inner column 431 from leaving the transmission groove. A connecting spring 433 is installed in the transmission groove, and one end of the connecting spring 433 abuts against the end of the inner column 431, and the other end abuts against the groove wall of the transmission groove away from the groove. When the connecting spring 433 is elastically released, it pushes the inner column 431 to protrude out of the transmission groove.

[0071] The card strip 23 is inclined to form a sliding surface 231 on one side facing away from the control ring 22. When the connecting column 2 is inserted into the plug-in slot 11, the slot wall at the notch of the plug-in slot 11 slides on the sliding surface 231, pushing the card strip 23 to slide into the connecting column 2. At this time, the driving column 42 pushes the inner column 431 to slide into the transmission groove until the card strip 23 is aligned with the card slot 13. The connecting spring 433 is elastically released to push the driving column 42 to slide, so that the card strip 23 is inserted into the card slot 13, so as to realize the connection between the connecting column 2 and the current limiter body 1 (the current limiter body 1 is in Figure 2 The connection between them is fixed.

[0072] In order to improve the connection stability between the wire and the connecting column 2, the connecting column 2 is provided with a fixing plate 26, which is an arc-shaped plate-like structure, and the arc-shaped inner concave side of the fixing plate 26 faces the central axis direction of the connecting column 2. The fixing plate 26 is located in the slide groove 25 and corresponds to the fixing plate 26 one by one. The fixing plate 26 has a connecting strip 27 symmetrically arranged above and below, and the connecting strip 27 is hingedly connected to the fixing plate 26, and the upper and lower sides of the connecting strip 27 away from the fixing plate 26 are respectively hinged to the driving strip 41 and the connecting column 2. In the initial state, the driving strip 41 abuts against the groove wall of the slide groove 25 away from the clamping strip 23, and the connecting strip 27 is in an inclined state.

[0073] When the driving bar 41 moves toward the clamping bar 23, the driving bar 41 drives the fixing plate 26 to approach the central axis of the connecting column 2 in the radial direction through the connecting bar 27 until the clamping bar 23 protrudes from the connecting column 2. The fixing plates 26 cooperate with each other to clamp the insulating layer on the outer periphery of the wire, thereby improving the stability of the wire. When the driving bar 41 moves away from the clamping bar 23, the driving bar 41 drives the fixing plate 26 to move away from the metal wire core in the radial direction through the connecting bar 27, so that the fixing plate 26 releases the wire.

[0074] The implementation principle of a single-phase fire current limiter in the embodiment of the present application is:

[0075] When the single-phase fire current limiter is connected to the wire, first peel off the insulation layer on the outer peripheral side of the wire to expose the metal wire core of the wire. Then pass the wire through the through hole 21 so that the metal wire core passes through the wire core hole 34. At this time, the insulation layer on the outer peripheral side of the wire abuts against the guide surface 32. Then rotate the control ring 22 so that the control ring 22 is close to the clamping strip 23. At this time, the control ring 22 drives the drive ring 4 to approach the clamping strip 23. Then the drive bar 41 pushes the drive column 42 through the transmission column 43 so that the clamping strip 23 protrudes outside the connecting column 2. At the same time, the drive bar 41 drives the fixing plate 26 to clamp the wire through the connecting bar 27. Finally, insert the connecting column 2 into the plug-in slot 11. At this time, the clamping plate 31 is inserted into the electrical connection hole 121 to clamp the metal wire core, and the clamping plate 31 abuts against the electrical connection ring 12, and the extra metal wire core section is located in the electrical connection hole 121. The single-phase fire current limiter is connected to the wire.

[0076] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A single-phase fire current limiter, characterized in that: include A current limiter body (1), wherein two opposite sides of the current limiter body (1) are respectively formed with insertion grooves (11); A connecting column (2) is plugged into the plug slot (11), and the connecting column (2) is formed with a through hole (21) through which a power supply line passes; A limiting ring (3) is arranged at one end of the connecting column (2) and blocks the penetration hole (21), the limiting ring (3) being formed with a wire core hole (34) for the exposed metal wire core to pass through; A clamping plate (31) is hinged to the limiting ring (3); a plurality of the clamping plates (31) are arranged circumferentially around the wire core hole (34); a driving surface (311) is formed on a side of the clamping plate (31) that is inclined away from the wire core hole (34); The current limiter body (1) is provided with an electrical connection ring (12) located in the plug-in slot (11), and the electrical connection ring (12) is formed with an electrical connection hole (121) for the clamping plate (31) to be inserted; The side wall of the electrical connection ring (12) slides on the driving surface (311), driving the clamping plate (31) to flip and clamp the metal wire core, and at this time the metal wire core forms an electrical connection with the electrical connection ring (12) through the clamping plate (31); A control ring (22) is sleeved on the outer peripheral side of the connecting column (2), and the control ring (22) is threadedly connected to the connecting column (2); A clamping strip (23) is radially slidable on the connecting column (2), and the flow limiter body (1) is formed with a clamping groove (13) located on the groove wall of the plug groove (11); a drive assembly, arranged on the connecting column (2), and when the clamping strip (23) is aligned with the clamping groove (13) and the control ring (22) is close to the limiting ring (3), the drive assembly drives the clamping strip (23) to clamp into the clamping groove (13) in a radial direction; The connecting column (2) is provided with an elastic driving member, and when the control ring (22) moves away from the limiting ring (3), the elastic driving member drives the clamping strip (23) to move away from the clamping groove (13).

2. A single-phase fire current limiter according to claim 1, characterized in that: The driving assembly comprises a driving bar (41), a driving column (42), a transmission column (43) and a driving ring (4); The driving strip (41) slides axially on the connecting column (2) and corresponds one-to-one with the clamping strip (23); the driving ring (4) is axially slidably sleeved on the outer peripheral side of the connecting column (2); the driving ring (4) is connected to the driving strip (41); The transmission column (43) slides up and down on the connecting column (2) and is arranged on a side of the driving bar (41) close to the clamping bar (23); the driving column (42) is arranged on the clamping bar (23); and the driving column (42) slides radially on the connecting column (2); A push surface (421) is formed at an angle on a side of the drive column (42) away from the clamping strip (23); when the drive ring (4) approaches the clamping strip (23), the drive column (42) slides on the push surface (421), and at this time, the clamping strip (23) is away from the drive column (42).

3. A single-phase fire current limiter according to claim 2, characterized in that: The outer wall of the driving column (42) is provided with a limiting block (422), and the connecting column (2) is formed with a limiting groove (24) for the limiting block (422) to slide.

4. A single-phase fire current limiter according to claim 3, characterized in that: The elastic driving member comprises a driving spring (5), wherein the driving spring (5) is arranged in the limiting groove (24), and the driving spring (5) drives the limiting block (422) to approach the transmission column (43).

5. A single-phase fire current limiter according to claim 4, characterized in that: The transmission column (43) comprises an inner column (431), an outer column (432) and a connecting spring (433); The outer column (432) is arranged on the driving bar (41), the inner column (431) slides up and down on the outer column (432), the connecting spring (433) is arranged in the outer column (432), and the connecting spring (433) drives the inner column (431) to protrude toward the outer column (432).

6. A single-phase fire current limiter according to claim 5, characterized in that: The connecting column (2) is formed with a slide groove (25) for the driving bar (41) to slide up and down, and the vertical side walls on the opposite sides of the outer column (432) are in sliding contact with the relative groove walls of the slide groove (25); A blocking strip (411) is provided on the side of the driving strip (41) facing away from the driving column (42) and slides up and down on the connecting column (2), and the vertical side walls of the blocking strip (411) on the opposite side are in sliding contact with the groove walls of the sliding groove (25).

7. A single-phase fire current limiter according to claim 6, characterized in that: The connecting column (2) is provided with a fixed plate (26) located in the sliding groove (25) and corresponding to each other. The fixed plate (26) is symmetrically arranged up and down and is hinged with a connecting strip (27); A side of the connecting strip (27) away from the fixing plate (26) is respectively hinged to the driving strip (41) and the connecting column (2); When the driving strip (41) approaches the clamping strip (23), the fixing plate (26) approaches the electric wire in the radial direction; When the driving strip (41) moves away from the clamping strip (23), the fixing plate (26) moves away from the electric wire in the radial direction.

8. A single-phase fire current limiter according to claim 1, characterized in that: The clamping strip (23) is inclined on one side facing away from the control ring (22) to form a sliding surface (231), and the slot wall of the insertion slot (11) slides on the sliding surface (231) to guide the clamping strip (23) to slide into the clamping slot (13).

9. A single-phase fire current limiter according to claim 1, characterized in that: The limiting ring (3) is obliquely formed with a guide surface (32) surrounding the wire core hole (34).

10. A single-phase fire current limiter according to claim 1, characterized in that: A limiting strip (33) is provided on the side of the limiting ring (3) facing away from the control ring (22), and the limiting strip (33) abuts against the driving surface (311).

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