Three-phase synchronous drop-out fuse device and method

Abstract

The application relates to the technical field of power switches, and discloses a three-phase synchronous drop type fuse device and method, which comprises a top shell, the lower surface of the top shell is fixedly connected with a resistance assembly, the bottom end of the resistance assembly is fixedly connected with a base, the lower side of the resistance assembly is fixedly connected with a supporting shell, the outer side of the supporting shell is fixedly connected with an insulating support, the inner side of the supporting shell is rotationally connected with a fuse tube, the outer side of the fuse tube is slidably connected with a sliding sleeve, the lower surface of the top shell is fixedly connected with an adjusting assembly, the lower side of the adjusting assembly is rotationally connected with a sliding rod, the top end of the resistance assembly is externally provided with a fixing assembly, and the rotationally connected position of the fuse tube and the supporting shell is provided with a protection assembly. Through the cooperation of the sliding sleeve, the sliding rod and the adjusting assembly, when the fuse tube drops due to abnormal current, the action of the single fuse tube can be synchronously transmitted to the other two phases of the three-phase system, so that the reliability and stability of circuit protection are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power switch, in particular to a three-phase synchronous drop-out fuse device and method. BACKGROUND

[0002] In the power distribution field of the power system, the drop-out fuse is widely used in the short-circuit and overload protection scene of the power distribution line and the power transformer at the voltage level of 10kV and below as the key equipment of overcurrent protection. For the three-phase alternating current power supply system, the three-phase synchronous action performance of the fuse is one of the core indicators to ensure the stable operation of the system.

[0003] For the three-phase power supply system, the three-phase synchronous action performance of the fuse directly affects the stability and reliability of the system, and the drop-out fuse in the prior art usually adopts a mechanism of independent triggering of each phase. When the circuit occurs overload or short-circuit fault, the action time of each phase fuse is often different, and it is difficult to realize precise three-phase synchronous drop-out.

[0004] The present application inventors found in the research that the core defect of the above-mentioned prior art is that the asynchronous action of the three-phase fuse causes the three-phase current imbalance of the system, generates negative sequence components, and further causes the heating of the motor. SUMMARY

[0005] In view of the deficiencies of the prior art, the present application provides a three-phase synchronous drop-out fuse device and method, which solves the problem of three-phase current imbalance caused by the asynchronous action of the three-phase fuse.

[0006] To achieve the above purpose, the present application realizes the following technical scheme: a three-phase synchronous drop-out fuse device, comprising a top shell, a resistance assembly is fixedly connected to the lower surface of the top shell, a bottom seat is fixedly connected to the bottom end of the resistance assembly, a supporting shell is fixedly connected to the lower side of the resistance assembly, an insulating support is fixedly connected to the outside of the supporting shell, a fuse tube is rotatably connected to the inside of the supporting shell, a sliding sleeve is slidably connected to the outside of the fuse tube, a contact is fixedly connected to the upper side of the fuse tube, an adjusting assembly is fixedly connected to the lower surface of the top shell, a sliding rod is rotatably connected to the lower side of the adjusting assembly, the outside of the sliding sleeve is rotatably connected to the outside of the sliding rod, a fixing assembly is arranged at the top end of the resistance assembly, and a protection assembly is arranged at the rotatable connection between the fuse tube and the supporting shell.

[0007] By adopting the above technical scheme, through the mutual cooperation of the top shell, the resistance assembly, the supporting shell, the fuse tube, the sliding sleeve and the adjusting assembly component, when the circuit is overloaded or short-circuited, the abnormal current flows through the fuse tube and the contact to make the spring sheet deform by heat, pushes the stop block in the fixed assembly to release the constraint on the fuse tube, and when the fuse tube falls under the action of gravity, the external sliding sleeve drives the sliding rod to rotate, and through the rigid linkage structure of the adjusting assembly, the action is synchronously transmitted to the other two phases of the three-phase system, so that the three-phase fuse tube is ensured to be synchronously dropped to cut off the circuit, and at the same time, the fuse tube falls to trigger the protection assembly, the transmission of the rotating rod, the gear and the rack makes the protection shell cover the resistor wiring place, and the arc is isolated from the external environment.

[0008] Preferably, the adjusting assembly comprises a fixed shell one, the top end of the fixed shell one is fixedly connected to the lower surface of the top shell, the inside of the fixed shell one is fixedly connected with a rotating column, the outside of the rotating column is provided with an adjusting rod, the lower side outside of the adjusting rod is rotatably connected to the outside of the sliding rod, and the upper side outside of the adjusting rod is fixedly connected with a handle.

[0009] Preferably, the inside of the adjusting rod is slidably connected with a first spring, a gasket is arranged between the first spring and the adjusting rod, and the outside of one side of the first spring is in contact with the outside of the rotating column.

[0010] Preferably, the resistance assembly comprises a resistor, the top end of the resistor is fixedly connected to the inside of the top shell, and the outside of the resistor is provided with a spring sheet on the upper side.

[0011] Preferably, the fixed assembly comprises a fixed shell two, the inside of the fixed shell two is fixedly connected to the top end outside of the resistor, the lower side inside of the fixed shell two is slidably connected with a connecting rod, and the top end of the connecting rod is fixedly connected with a stop block one.

[0012] Preferably, the outside of the stop block one is provided with a stop block two, the stop block two is slidably connected to the inside of the fixed shell two through a second spring, for extruding the spring sheet, and the outside of the stop block one penetrates between the plurality of second springs.

[0013] Preferably, the protection assembly comprises a rotating rod, one side outside of the rotating rod is rotatably connected to the inside of the supporting shell, the outside of the other side of the rotating rod is fixedly connected with a gear, the outside of the gear is rotatably connected to the inside of an insulating support, and the tooth end of the gear is meshingly connected with a rack.

[0014] Preferably, the outside of the rack is slidably connected to the inside of the insulating support, one side outside of the rack is fixedly connected with a connecting plate, and one side outside of the connecting plate is fixedly connected with a protection shell.

[0015] Preferably, the protection shell covers the wiring place of the resistor to prevent external foreign matters from entering.

[0016] Preferably, a method for using a three-phase synchronous drop-out fuse device, comprising the following steps:

[0017] S1, when the circuit is overloaded or short-circuited, the abnormal current flows through the fuse tube and the contact, the contact heats up and causes the spring sheet to deform, pushing the second block in the fixing assembly to compress the second spring, the second block further pushes the first block, and the inverted conical structure of the first block exerts extrusion force on the fuse tube to release the fixing constraint of the fuse tube on the resistance assembly.

[0018] S2, the fuse tube starts to fall under the action of gravity, the outer sliding sleeve slides along the fuse tube and drives the sliding rod to rotate, the rotation of the sliding rod is synchronously transmitted to the other two-phase fuse devices of the three-phase system through the adjusting assembly, ensuring that the three-phase fuse tubes fall at the same time to cut off the circuit.

[0019] S3, during the falling process of the fuse tube, the rotating connection between the fuse tube and the support shell triggers the protection assembly; the rotating rod rotates with the fuse tube, driving the gear to rotate; the gear engages with the rack to make it slide along the insulating support, and the rack pushes the protection shell through the connecting plate to cover the wiring of the resistor, isolating the electric arc from the external environment and avoiding the risk of arc burn or short circuit.

[0020] S4, when resetting is needed, the operator pushes the handle to exert external force, making the adjusting rod make circular motion around the rotating column, the adjusting rod drives the sliding rod to make arc motion, driving the sliding sleeve to slide along the fuse tube, and the sliding sleeve resets the fuse tube and the contact to the inside of the spring sheet during the sliding process, restoring the electrical connection.

[0021] By adopting the above technical scheme, when the circuit is overloaded or short-circuited, the abnormal current flows through the fuse tube and the contact, the contact heats up and causes the spring sheet to deform, pushing the second block in the fixing assembly to compress the second spring and drive the first block, and the inverted conical structure releases the fixing constraint of the fuse tube on the resistance assembly; when the fuse tube falls under the action of gravity, the outer sliding sleeve slides along it and drives the sliding rod to rotate, and the action is synchronously transmitted to the other two phases of the three-phase system through the adjusting assembly, ensuring that the three-phase fuse tubes fall at the same time to cut off the circuit, solving the problem of system imbalance caused by the asynchronous action of the traditional fuse three-phase; at the same time, the falling of the fuse tube triggers the protection assembly, the rotating rod drives the gear to rotate and engage with the rack, and the protection shell covers the resistor wiring, isolating the electric arc from the external environment and avoiding the risk of arc burn or short circuit; when resetting, the operator pushes the handle to make the adjusting rod rotate around the rotating column, and the sliding sleeve resets the fuse tube and the contact to the inside of the spring sheet through the sliding rod, simplifying the resetting process and improving the maintenance convenience. The scheme realizes three-phase synchronous action through mechanical linkage, without the need for additional detection circuit, and has fast response and high reliability, and the protection design effectively improves the safety and durability of the equipment.

[0022] The application provides a three-phase synchronous drop-out type fuse device and method.

[0023] 1、The application can synchronously transmit the action of a single fuse tube to the other two phases of a three-phase system when the fuse tube drops due to abnormal current through the cooperation of the sliding sleeve, the slide rod and the adjusting assembly, thereby ensuring that the three-phase fuse tube drops and cuts off the circuit at the same time, effectively solving the problem of system imbalance caused by the asynchronous action of the traditional fuse three-phase, and improving the reliability and stability of circuit protection.

[0024] 2、The protective assembly composed of the rotating rod, the gear, the rack and the protective shell is triggered when the fuse tube drops, and the protective shell can automatically cover the resistor wiring place, which can not only isolate the electric arc from the external environment and avoid the electric arc from burning the surrounding components or causing a short circuit, but also block the external foreign matters such as dust and rainwater from entering the wiring area, thereby preventing the insulation performance from being reduced due to the accumulation of foreign matters and improving the safety and durability of the device.

[0025] 3、When the application is reset, the operator pushes the handle to drive the adjusting rod to rotate around the rotating column, and the fuse tube and the contact are reset to the spring sheet through the slide rod and the sliding sleeve, so that the reset process is simplified, the maintenance difficulty is reduced, and the convenience and efficiency of equipment maintenance are improved.

[0026] 4、The application utilizes the physical property of the spring sheet that deforms under heat, and when the circuit is overloaded or short-circuited, the contact heating causes the spring sheet to deform and push the fixed assembly to release the constraint on the fuse tube, so that the fast response to the circuit state is realized without an additional detection circuit, and the accuracy and reliability of circuit protection are improved. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is a schematic diagram of the three-dimensional structure of the application;

[0028] Figure 2 is a schematic diagram of the local structure of the insulating support of the application;

[0029] Figure 3 is a schematic diagram of the local structure of the fuse tube of the application;

[0030] Figure 4 is a schematic diagram of the local structure of the adjusting assembly of the application;

[0031] Figure 5 is a schematic diagram of the local structure of the first spring of the application;

[0032] Figure 6 is a schematic diagram of the local structure of the spring sheet of the application;

[0033] Figure 7 is a schematic diagram of the local structure of the stop block two of the application;

[0034] Figure 8 The partial structure diagram of the protective shell of the present application.

[0035] Wherein, 1, top shell; 2, resistance assembly; 21, resistor; 22, spring piece; 3, base; 4, support shell; 5, insulating support; 6, fuse tube; 7, sliding sleeve; 8, contact; 9, sliding rod; 10, adjusting assembly; 101, fixed shell one; 102, rotating column; 103, adjusting rod; 104, gasket; 105, first spring; 106, handle rod; 11, fixed assembly; 111, fixed shell two; 112, connecting rod; 113, stop block one; 114, stop block two; 115, second spring; 12, protection assembly; 121, rotating rod; 122, gear; 123, rack; 124, connecting plate; 125, protective shell. DETAILED DESCRIPTION

[0036] The technical solutions of the present application will be described clearly and completely below in combination with the drawings of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0037] Please refer to the drawings of the present application Figure 1 - the drawings of the present application Figure 3 The embodiment of the present application provides a three-phase synchronous drop type fuse fuse device, which comprises a top shell 1, the lower surface of the top shell 1 is fixedly connected with a resistance assembly 2, the bottom end of the resistance assembly 2 is fixedly connected with a base 3, the lower side of the resistance assembly 2 is fixedly connected with a support shell 4, the outside of the support shell 4 is fixedly connected with an insulating support 5, the inside of the support shell 4 is rotatably connected with a fuse tube 6, the outside of the fuse tube 6 is slidably connected with a sliding sleeve 7, the upper side of the fuse tube 6 is fixedly connected with a contact 8, the lower surface of the top shell 1 is fixedly connected with an adjusting assembly 10, the lower side of the adjusting assembly 10 is rotatably connected with a sliding rod 9, the outside of the sliding sleeve 7 is rotatably connected to the outside of the sliding rod 9, the top end of the resistance assembly 2 is provided with a fixed assembly 11, and the rotatable connection position of the fuse tube 6 and the support shell 4 is provided with a protection assembly 12.

[0038] Specifically, when the circuit is overloaded or short-circuited, abnormal current flows through the fuse tube 6 and the contact 8, the contact 8 generates heat to deform the spring sheet 22, push the stop block two 114 in the fixed assembly 11 to compress the second spring 115, and then release the constraint on the fuse tube 6 through the inverted conical stop block one 113, and use gravity to make it fall. At this time, the sliding sleeve 7 slides along the fuse tube 6 and drives the sliding rod 9 to rotate, and the action of a single fuse tube 6 is synchronized to the other two phases of the three-phase system through the adjusting assembly 10, ensuring that the three-phase fuse tube 6 falls at the same time to cut off the circuit, solving the problem of system imbalance caused by the asynchronous action of the traditional fuse three-phase. During the falling process of the fuse tube 6, the rotating rod 121 drives the gear 122 to drive the rack 123, so that the protective shell 125 covers the resistor 21 connection, isolates the electric arc from the external environment, and avoids the risk of short circuit caused by the arc burn or foreign matter entering in the traditional device. When resetting, the operator pushes the handle 106 to drive the adjusting rod 103 to rotate around the rotating column 102, and resets the fuse tube 6 to the spring sheet 22 through the sliding rod 9 and the sliding sleeve 7, restores the electrical connection, and solves the problem of complex operation of the traditional device.

[0039] Please refer to the accompanying Figure 4 and the accompanying Figure 5 The adjusting assembly 10 includes a fixed shell one 101, the top end of the fixed shell one 101 is fixedly connected to the lower surface of the top shell 1, the inside of the fixed shell one 101 is fixedly connected with a rotating column 102, the outside of the rotating column 102 is provided with an adjusting rod 103, the lower side of the outside of the adjusting rod 103 is rotatably connected to the outside of the sliding rod 9, and the upper side of the outside of the adjusting rod 103 is fixedly connected with a handle 106; the inside of the adjusting rod 103 is slidably connected with a first spring 105, a gasket 104 is arranged between the first spring 105 and the adjusting rod 103, and the outside of one side of the first spring 105 is in contact with the outside of the rotating column 102.

[0040] Specifically, when resetting is needed, the operator applies external force by pushing the handle 106, which will make the adjusting rod 103 make circular motion around the rotating column 102 due to the fixed connection between the handle 106 and the adjusting rod 103. The adjusting rod 103 will extrude the first spring 105 and the gasket 104 when rotating, and limit the excessive rotation of the adjusting rod 103. The lower side of the adjusting rod 103 is rotatably connected with the sliding rod 9, and the circular motion of the adjusting rod 103 is converted into the arc motion of the sliding rod 9, so as to push the sliding sleeve 7 to slide along the fuse tube 6, and the sliding sleeve 7 will drive the fuse tube 6 and the contact 8 to be fixed in the inside of the spring sheet 22 at the same time, and then realize the reset of the contact 8 and the circuit.

[0041] Please refer to the accompanying Figure 6 and the accompanying Figure 7, the resistance assembly 2 includes a resistor 21, the top end of the resistor 21 is fixedly connected in the inside of the top shell 1, the outside upper side of the resistor 21 is provided with a spring sheet 22; the fixed assembly 11 includes a fixed shell two 111, the inside of the fixed shell two 111 is fixedly connected at the top end of the resistor 21, the lower side inside of the fixed shell two 111 is slidably connected with a connecting rod 112, the top end of the connecting rod 112 is fixedly connected with a stop block one 113; the outside of the stop block one 113 is provided with a stop block two 114, the stop block two 114 is slidably connected in the inside of the fixed shell two 111 through a second spring 115, for extruding the spring sheet 22, the outside of the stop block one 113 penetrates between the plurality of second springs 115.

[0042] Specifically, when the circuit works normally, the stop block two 114 of the fixed assembly 11 extrudes the contact 8 under the action of the second spring 115, so that the spring sheet 22 is tightly attached to the outside of the contact 8, and the electrical connection between the resistor 21 and the fuse tube 6 is stable and reliable.

[0043] When the circuit appears abnormal current caused by overload or short circuit, the resistor 21 is heated due to the excessive current, and the heat is conducted to the spring sheet 22, the spring sheet 22 is deformed after being heated, and the spring sheet 22 pushes the stop block two 114 to slide to the inside of the fixed shell two 111 against the elastic force of the second spring 115. At the same time, the movement of the stop block two 114 extrudes the stop block one 113, the stop block one 113 is driven by the connecting rod 112 to slide downward and extrude the fuse tube 6, so that the fuse tube 6 and the contact 8 are separated from the spring sheet 22, thereby achieving the fast response to the circuit state by using the physical properties of the material without additional detection circuit, effectively avoiding the electrical failure caused by poor contact or response delay, and improving the accuracy and reliability of the circuit protection.

[0044] Please refer to the accompanying Figure 7 and the accompanying Figure 8 , the protection assembly 12 includes a rotating rod 121, one side of the rotating rod 121 is rotatably connected in the inside of the support shell 4, the other side of the rotating rod 121 is fixedly connected with a gear 122, the gear 122 is rotatably connected in the inside of the insulating support 5, the gear 122 is meshingly connected with a rack 123; the outside of the rack 123 is slidably connected in the inside of the insulating support 5, one side of the outside of the rack 123 is fixedly connected with a connecting plate 124, one side of the outside of the connecting plate 124 is fixedly connected with a protection shell 125; the protection shell 125 covers the wiring position of the resistor 21 to prevent foreign matters from entering.

[0045] Specifically, when the fuse tube 6 falls and rotates due to a circuit fault, the rotating rod 121 connected to the support shell 4 rotates synchronously, driving the gear 122 at the other end to rotate in the insulating support 5. The rotation of the gear 122 drives the rack 123 to slide linearly along the slide of the insulating support 5 through the meshing of the tooth end. The rack 123 pushes the protective shell 125 through the connecting plate 124 to move towards the wiring of the resistor 21 and cover the wiring area, so as to avoid arc burn of surrounding components or short circuit, and block dust, rain and other external foreign matters from entering the wiring area, preventing the insulation performance from being reduced due to accumulation of foreign matters.

[0046] A method for using a three-phase synchronous drop-out fuse device, comprising the following steps:

[0047] S1, when an overload or short circuit fault occurs in the circuit, abnormal current flows through the fuse tube 6 and the contact 8, the contact 8 generates heat to cause the spring sheet 22 to deform, push the stop block two 114 in the fixed assembly 11 to compress the second spring 115, and further push the stop block one 113, so that the inverted conical structure of the stop block one 113 exerts extrusion force on the fuse tube 6 to release the fixing constraint of the fuse tube 6 on the resistor assembly 2.

[0048] S2, the fuse tube 6 starts to fall under the action of gravity, the sliding sleeve 7 outside the fuse tube 6 slides along the fuse tube 6 and drives the sliding rod 9 to rotate, and the rotation of the sliding rod 9 is synchronously transmitted to the other two-phase fuse devices of the three-phase system through the adjusting assembly 10, so as to ensure that the three-phase fuse tubes 6 fall at the same time to cut off the circuit.

[0049] S3, during the falling process of the fuse tube 6, the rotating connection between the fuse tube 6 and the support shell 4 triggers the protection assembly 12; the rotating rod 121 rotates with the fuse tube 6 to drive the gear 122 to rotate; the gear 122 meshes with the rack 123 to make the rack 123 slide along the insulating support 5, and the rack 123 pushes the protective shell 125 through the connecting plate 124 to cover the wiring of the resistor 21, so as to isolate the arc from the external environment and avoid the risk of arc burn or short circuit.

[0050] S4, when it is necessary to reset, an operator pushes the handle 106 to exert an external force, so that the adjusting rod 103 makes circular motion around the rotating column 102, the adjusting rod 103 drives the sliding rod 9 to make arc motion, and the sliding sleeve 7 slides along the fuse tube 6 to reset the fuse tube 6 and the contact 8 to the inside of the spring sheet 22, and restore the electrical connection.

[0051] Specifically, when the circuit is overloaded or short-circuited, abnormal current flows through the fuse tube 6 and the contact 8, the contact 8 generates heat to deform the spring sheet 22, the spring sheet 22 pushes the stop block two 114 in the fixed assembly 11 to compress the second spring 115, the stop block two 114 pushes the stop block one 113, the lower half of the stop block one 113 is inverted conical, the stop block one 113 extrudes the fuse tube 6, and the stop block one 113 releases the fixing constraint of the fuse tube 6 on the resistance assembly 2. At this time, the fuse tube 6 starts to fall under the action of gravity, the outer sleeve 7 slides along the outside of the fuse tube 6 and rotates outside the slide rod 9 until the outer sleeve 7 slides to the top end of the fuse tube 6, the outer sleeve 7 drives the slide rod 9 to rotate around the inside of the support shell 4 in the process of sliding down, the adjusting rod 103 rotates around the rotating column 102, the single fuse tube 6 is synchronized to the other two-phase fuse devices in the three-phase system through the rotation of the slide rod 9 driven by the outer sleeve 7, and the three-phase fuse tube 6 is ensured to fall at the same time to cut off the circuit. In the process of falling of the fuse tube 6, the rotating connection between the fuse tube 6 and the support shell 4 triggers the protection assembly 12, the rotating rod 121 rotates with the fuse tube 6, drives the gear 122 to rotate, the gear 122 engages with the rack 123 to make the rack 123 slide along the insulating support 5, the rack 123 pushes the protection shell 125 through the connecting plate 124 to cover the wiring position of the resistor 21 at the lower end, isolates the electric arc from the external environment, and avoids the risk of electric arc burn or short circuit.

[0052] When it is necessary to reset, the operator pushes the handle 106 to drive the adjusting rod 103 to rotate around the rotating column 102, and the fuse tube 6 is reset to the spring sheet 22 through the slide rod 9 and the outer sleeve 7. In this process, the top end of the outer sleeve 7 extrudes the connecting rod 112, the connecting rod 112 is extruded to push the stop block two 114 to stretch the second spring 115, and the spring sheet 22 is extruded at the same time, so that the spring sheet 22 can stably fix the fuse tube 6 and the contact 8, and finally achieve the effect of restoring the electrical connection.

[0053] Although the embodiments of the present application have been shown and described, it is to be understood that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A three-phase synchronous drop-out fuse device, comprising a top shell (1), characterized in that, A resistor assembly (2) is fixedly connected to the lower surface of the top shell (1). A base (3) is fixedly connected to the bottom end of the resistor assembly (2). A support shell (4) is fixedly connected to the lower side of the resistor assembly (2). An insulating support (5) is fixedly connected to the outside of the support shell (4). A fuse tube (6) is rotatably connected inside the support shell (4). A sliding sleeve (7) is slidably connected to the outside of the fuse tube (6). A contact (8) is fixedly connected to the upper side of the fuse tube (6). An adjustment assembly (10) is fixedly connected to the lower surface of the top shell (1). A slide rod (9) is rotatably connected to the lower side of the adjustment assembly (10). The outside of the sliding sleeve (7) is rotatably connected to the outside of the slide rod (9). A fixing assembly (11) is provided on the top of the resistor assembly (2). A protective assembly (12) is provided at the rotatable connection between the fuse tube (6) and the support shell (4). When the slide bar (9) of the three-phase fuse device causes any one phase fuse tube (6) to fall through the adjustment component (10), the rotation of the slide bar (9) driven by it can be synchronously transmitted to the other two phase fuse devices through the adjustment component (10), thereby achieving the synchronous falling action of the three-phase fuse tubes (6). The adjustment assembly (10) includes a fixed shell (101), the top of which is fixedly connected to the lower surface of the top shell (1), a rotating column (102) is fixedly connected inside the fixed shell (101), an adjustment rod (103) is provided outside the rotating column (102), the lower side of the adjustment rod (103) is rotatably connected to the outside of the slide rod (9), and a handle (106) is fixedly connected to the upper side of the adjustment rod (103). The adjusting rod (103) is internally slidably connected to a first spring (105), and a shim (104) is provided between the first spring (105) and the adjusting rod (103). One side of the first spring (105) contacts the outside of the rotating column (102). The fixing component (11) includes a fixing shell two (111), the inside of the fixing shell two (111) is fixedly connected to the outside of the top of the resistor (21) of the resistor component (2), and a connecting rod (112) is slidably connected to the inside of the lower side of the fixing shell two (111), and a stop block one (113) is fixedly connected to the top of the connecting rod (112). A second stop (114) is provided on the outside of the first stop (113). The second stop (114) is slidably connected to the inside of the second fixed shell (111) by the second spring (115) and is used to squeeze the spring sheet (22) on the upper side of the outside of the resistor (21). The protective assembly (12) includes a rotating rod (121), one side of which is rotatably connected to the inside of the support shell (4), and the other side of which is fixedly connected to a gear (122), which is rotatably connected to the inside of the insulating support (5), and the tooth end of the gear (122) is meshed with a rack (123). The rack (123) is externally slidably connected to the inside of the insulating support (5), and a connecting plate (124) is fixedly connected to one side of the rack (123), and a protective shell (125) is fixedly connected to one side of the connecting plate (124). The protective shell (125) covers the wiring of the resistor (21) to prevent foreign objects from entering.

2. The three-phase synchronous drop-out fuse device according to claim 1, characterized in that, The resistor assembly (2) includes a resistor (21), the top of which is fixedly connected to the inside of the top shell (1), and a spring sheet (22) is provided on the upper outer side of the resistor (21).

3. A method for using a three-phase synchronous drop-out fuse device, characterized in that, The three-phase synchronous drop-out fuse device according to claim 1 or 2 includes the following steps: S1. When the circuit is overloaded or short-circuited, the abnormal current flows through the fuse tube (6) and the contact (8). The contact (8) heats up, causing the spring sheet (22) to deform due to heat, which pushes the second stop (114) to compress the second spring (115). The second stop (114) further pushes the first stop (113), releasing the fixed constraint of the fuse tube (6) on the resistor assembly (2). S2. The fuse tube (6) begins to fall under the action of gravity. The outer sliding sleeve (7) slides along the fuse tube (6) and drives the sliding rod (9) to rotate. The rotation of the sliding rod (9) is transmitted synchronously to the other two phase fuse devices of the three-phase system through the adjustment component (10) to ensure that the three-phase fuse tubes (6) fall at the same time and cut off the circuit. S3. During the fall of the fuse tube (6), the rotating connection between it and the support shell (4) triggers the protective component (12). The rotating rod (121) drives the gear (122) to rotate. The gear (122) meshes with the rack (123) to make it slide along the insulating support (5). The rack (123) pushes the protective shell (125) to cover the wiring of the resistor (21) through the connecting plate (124). S4. When a reset is required, the operator pushes the lever (106) to drive the adjusting rod (103) to rotate around the rotating column (102), and resets the fuse tube (6) and contact (8) into the spring plate (22) through the slide rod (9) and the sliding sleeve (7) to restore the electrical connection.

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