Isolation transformer capable of rapidly limiting current
By integrating protective components, transformer components, and heat dissipation components, the design achieves rapid current limiting and automated explosion-proof protection for the isolation transformer, solving the problems of slow response speed and insufficient current limiting regulation of traditional isolation transformers, and improving safety and equipment lifespan.
Patent Information
- Application Number
- CN202511877989.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-12
- Publication Date
- 2026-02-13
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
Traditional isolation transformers have a slow response speed when dealing with output short circuits or severe overload faults, cannot effectively suppress huge short circuit currents, and pose risks of arcing, sparking or even explosion. In addition, their current limiting adjustment is not flexible enough.
It adopts an integrated design of protective components, transformer components and heat dissipation components, and uses motor drive coil group switching, circuit on and off and heat dissipation or explosion-proof gas circuit to realize full-process automated protection. By changing the output voltage through electromagnetic induction, it can quickly achieve physical isolation and inert gas explosion-proof protection.
It achieves rapid current limiting, high safety level, and high degree of automation, avoids the generation and development of short-circuit arcs, significantly improves equipment safety and service life, and reduces maintenance costs.
Smart Images
Figure CN121528684A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of isolation transformer technology, and in particular to an isolation transformer capable of rapid current limiting. Background Technology
[0002] As critical safety equipment in electrical maintenance, testing, and laboratories, isolation transformers are valued for providing potential isolation and preventing electric shock accidents. However, traditional isolation transformers have significant limitations in handling output short circuits or severe overload faults. They typically rely solely on fuses or thermal-magnetic circuit breakers for protection, which are relatively slow to operate and cannot effectively suppress the massive short-circuit current at the moment of a fault. This means that during the maintenance of live lines or the testing of unknown equipment, if a short circuit is accidentally triggered, it can still generate strong arcs, sparks, or even explosions, posing a risk of burns to operators and potentially damaging the expensive internal coils and contact structures.
[0003] Furthermore, traditional mechanical tap changer switching or variable inductor current limiting methods struggle to balance response speed and adjustment flexibility, proving insufficient for applications requiring rapid and precise setting of different current limiting thresholds. Therefore, the industry urgently needs an isolation transformer that integrates rapid electronically controlled current limiting switching, instantaneous physical disconnection, and active explosion-proof protection. This transformer can achieve rapid energy control and isolation at the initial stage of a fault, thereby elevating safety levels to a new level. We propose an isolation transformer capable of rapid current limiting. Summary of the Invention
[0004] In order to overcome the technical problems existing in the prior art, the present invention provides an isolation transformer that can quickly limit current.
[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: including a mounting bracket, wherein a protective component, a transformer component and a heat dissipation component are provided on the side of the mounting bracket; The protective component includes a protective cylinder, on the side of which a fan module and a connecting rod are provided. Inside the connecting rod are an electric contact rod, a support cylinder, a power terminal, and a connecting wire. The transformer assembly includes a mounting rod, with fixing rings symmetrically fixed on the inner side of the mounting rod. A motor and a trigger plate are provided on the lower side of the mounting rod. A fixed coil group, a first moving coil group, a second moving coil group, a third moving coil group, and a fourth moving coil group are provided on the side of the mounting rod. A slide rod, a constraint block, a constraint rod, and a return spring are provided on the lower side of the fixed coil group. The heat dissipation assembly includes a flow guide cavity, and the wall of the flow guide cavity is provided with a first opening and a second opening that penetrate the mounting bracket at equal intervals. The side of the trigger plate is provided with a first mating hole, a second mating hole and a third mating hole that penetrate it at equal intervals.
[0006] Furthermore, the protective cylinder is fixedly installed at the center of the side of the mounting frame, and a mounting plate is fixedly installed on the side of the protective cylinder away from the mounting frame. The fan module is fixedly installed at the center of the side of the mounting plate, and the air outlet of the fan module is set in the opposite direction to the mounting frame.
[0007] Furthermore, the connecting rod is symmetrically and fixedly disposed on the side of the protective cylinder, and a movable cavity is opened on the side of the connecting rod, through which the electric contact rod is movably installed inside the movable cavity. The support cylinder is fixedly connected between the side of the electric contact rod and the wall of the movable cavity, the power terminal is fixedly installed on the side of the connecting rod away from the electric contact rod, and the connecting wire is fixedly connected between the side of the electric contact rod and the side of the power terminal.
[0008] Furthermore, the mounting rods are equidistantly arranged on the side of the mounting frame and are located inside the protective cylinder. A fixing frame is fixedly installed on the inner side of the fixing ring near the mounting frame. The motor is fixedly installed on the side of the mounting frame away from the mounting rods, and the motor output end passes through the mounting frame and is fixedly connected to the side of the fixing frame.
[0009] Furthermore, the fixed coil group is movably disposed between the mounting rods and the electric contact rod elastically contacts the electrical connection port on the side of the fixed coil group to connect the circuit. The first moving coil group, the second moving coil group, the third moving coil group and the fourth moving coil group are respectively fixedly disposed at equal intervals on the side of the mounting rod.
[0010] Furthermore, the mounting frame has an internal mounting cavity, a trigger plate is movably disposed inside the mounting cavity and fixedly sleeved on the side of the motor output end, the trigger plate is a continuous cam-shaped annular plate on the side, the wall of the mounting cavity has a groove corresponding to the position of the fixed coil group, the slide rod is slidably disposed inside the slide groove and fixedly disposed on the lower side of the fixed coil group, the constraint block is slidably disposed inside the slide groove corresponding to the side of the slide rod, the constraint rod is fixedly disposed on the side of the constraint block and slidably disposed inside the mounting frame, and the return spring is fixedly connected to the side of the constraint rod away from the constraint block.
[0011] Furthermore, the flow guiding cavity is opened inside the mounting frame corresponding to the mounting cavity position. The side of the mounting frame is symmetrically fixed with flow guiding pipes that penetrate into the flow guiding cavity. The first opening and the second opening are set through the mounting cavity. A transition cavity is opened on the lower side of the mounting rod, and the transition cavity corresponds to the position of the first opening. The two walls inside the transition cavity are equidistantly provided with exhaust holes that penetrate the mounting rod.
[0012] Furthermore, the first mating hole corresponds to the protruding part of the trigger plate, the second and third mating holes correspond to the recessed parts of the trigger plate, the first and second mating holes rotate to correspond to the first opening, and the third mating hole rotates to correspond to the second opening.
[0013] Compared with the prior art, the beneficial effects that this invention can achieve are: 1. This invention integrates protective components, transformer components, and heat dissipation components to achieve rapid response, high safety level, and active protection capabilities in the isolation transformer. The core of this invention lies in using a drive motor to synchronously control the switching of coil groups, circuit switching, and heat dissipation or explosion-proof air circuits. This achieves fully automated protection from fault detection to complete physical isolation and environmental suppression. Under extremely fast, fully automatic electronic control, it completes the rapid switching from normal working state to safe isolation state, fundamentally suppressing the generation and development of short-circuit arcs and greatly ensuring the safety of personnel and equipment.
[0014] 2. This invention achieves adjustable current limiting and instantaneous physical power disconnection by setting up protective components and transformer components. Specifically, the motor drives the mounting rod to rotate, so that the moving coil group with different number of turns is precisely aligned with the fixed coil group. The output voltage is changed by using the principle of electromagnetic induction, so that different output current limits are preset when the load is constant. When a short circuit fault is detected, the same motor drives the trigger plate to rotate, and the cam structure forces the fixed coil group to disengage laterally. At the same time, the moving coil group rotates synchronously and disengages from the electric contact rod, realizing a fast and complete mechanical disconnection of the main circuit. The response speed is far superior to that of traditional fuses, and the energy source of continuous electric arc is completely eliminated.
[0015] 3. This invention creates an explosion-proof environment with active inert gas by setting up a transformer component and a heat dissipation component. The multi-channel vent system formed by the transformer component and the heat dissipation component allows inert gas to flow directionally through the coil area to assist in heat dissipation during normal operation. At the moment the power failure protection is triggered, the vents on the trigger plate align with different outlets, allowing the inert gas to be released rapidly into the protective cylinder from multiple paths simultaneously. Combined with the turbulence formed by the fan reversing, the inert gas can uniformly fill the entire arc risk area in a very short time, actively diluting oxygen and suppressing the tiny sparks that may be generated during cooling, thus achieving an explosion-proof upgrade from passively withstanding to actively extinguishing.
[0016] 4. By setting up protective components, the protective cylinder combined with the heat-conducting design and directional air cooling effectively controls the working temperature of core components such as coils. At the same time, the electric contact rod maintains good contact with the moving coil group under the elastic support of the support cylinder, avoiding heat generation and electric sparks caused by poor contact. In the event of a fault, rapid physical isolation and inert gas protection jointly prevent internal components from being burned or aged due to high temperature of electric arc, significantly extending the service life of the transformer and reducing maintenance costs.
[0017] 5. The isolation transformer in this invention has a compact structure and a high degree of automation. All key actions, such as gear switching, power-off separation, and pneumatic circuit conversion, are synchronously driven by a single motor through a trigger plate and linkage mechanism. The integrated linkage design simplifies the structure, reduces the number of independent actuators, and ensures strict and reliable timing coordination between each protection step, avoiding protection blind spots that may be caused by inconsistent response times of multiple electrical components. Attached Figure Description
[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a cross-sectional structural diagram of the present invention; Figure 3 This is a partial structural schematic diagram of the present invention; Figure 4 This is a cross-sectional structural diagram of the transformer assembly of the present invention; Figure 5 This is a partial structural schematic diagram of the transformer assembly of the present invention; Figure 6 For the present invention Figure 2 A magnified structural diagram at point A; Figure 7 This is a schematic diagram of the structure of the transformer assembly of the present invention; Figure 8 This is a partial structural schematic diagram of the transformer assembly of the present invention; Figure 9 For the present invention Figure 6 A magnified structural diagram at point B; Figure 10 This is a partial structural schematic diagram of the heat dissipation component of the present invention; Figure 11 This is a schematic cross-sectional view of the transition cavity of the present invention.
[0019] The components include: 1. Mounting bracket; 2. Protective assembly; 21. Protective cylinder; 22. Mounting plate; 221. Fan module; 23. Connecting rod; 231. Movable cavity; 24. Electrical contact rod; 25. Support cylinder; 26. Electrical terminal; 27. Connecting wire; 3. Transformer assembly; 31. Mounting rod; 311. Fixing ring; 32. Fixing bracket; 33. Motor; 34. Stator coil assembly; 341. Slide rod; 35. First moving coil assembly; 351. Second moving coil assembly. 352. Third moving coil group; 353. Fourth moving coil group; 36. Mounting cavity; 361. Trigger plate; 37. Slide groove; 371. Constraint block; 372. Constraint rod; 373. Return spring; 4. Heat dissipation assembly; 41. Guide cavity; 42. Guide pipe; 43. First opening; 44. Second opening; 431. First mating hole; 432. Second mating hole; 441. Third mating hole; 45. Transition cavity; 46. Exhaust hole. Detailed Implementation
[0020] To make the technical means, creative features, and achieved objectives and effects of this invention easier to understand, the invention is further described below with reference to specific embodiments. However, the following embodiments are merely preferred embodiments of this invention and not all of them. Other embodiments obtained by those skilled in the art based on the embodiments described herein without creative effort are all within the protection scope of this invention. Unless otherwise specified, the experimental methods in the following embodiments are conventional methods, and the materials and reagents used in the following embodiments are commercially available unless otherwise specified.
[0021] Example: Figure 1 and Figure 2 As shown, an isolation transformer capable of rapid current limiting includes a mounting frame 1. A protective component 2, a transformer component 3, and a heat dissipation component 4 are provided on the side of the mounting frame 1. The protective component 2 can protect the entire transformer and facilitate subsequent heat dissipation, energization, and de-energization. The transformer component 3 can perform voltage switching to realize current limiting operation and can be completely de-energized afterward. The heat dissipation component 4 can perform normal heat dissipation operation and provide explosion-proof protection during power failure.
[0022] like Figures 2 to 6As shown, the protective component 2 includes a protective cylinder 21, which is fixedly installed at the center of the side of the mounting frame 1. The protective cylinder 21 is a hollow cylinder made of thermally conductive material. A mounting plate 22 is fixedly installed on the side of the protective cylinder 21 away from the mounting frame 1. The mounting plate 22 is a circular plate. A fan module 221 is fixedly installed at the center of the side of the mounting plate 22. The air outlet of the fan module 221 is set opposite to the mounting frame 1. A connecting rod 23 is mirror-symmetrically arranged on the side of the protective cylinder 21 and is fixedly installed through the protective cylinder 21. A movable cavity 231 is opened on the side of the connecting rod 23 and passes through it. The movable cavity 231 is a cylindrical cavity with a cross-shaped cross section. An electric contact rod 24 is movably installed inside the movable cavity 231. The electric contact rod 24 is a "T"-shaped cylindrical rod with a tapered front end. A support cylinder 25 is fixedly connected between the side of the electric contact rod 24 and the wall of the movable cavity 231 and is positioned in the movable cavity. Inside cavity 231, support cylinder 25 is a corrugated cylinder made of elastic material. A terminal 26 is fixedly installed on the side of connecting rod 23 away from electric contact rod 24. A connecting wire 27 is fixedly connected between the electric contact rod 24 and the side of terminal 26, with the connecting wire 27 positioned at the center of support cylinder 25. Specifically, the connecting wire 27 connects the internal circuits of electric contact rod 24 and terminal 26, allowing terminal 26 to connect to an external circuit. When electric contact rod 24 is compressed, it slides inside movable cavity 231. Support cylinder 25 provides elastic support to reset electric contact rod 24, enabling elastic contact electrical connection with subsequent components. Furthermore, during normal operation of fan module 221, airflow inside protective cylinder 21 is circulated for heat dissipation. With the fan module 221 rotating its blades in the opposite direction, gas is trapped inside protective cylinder 21, achieving arc extinguishing and explosion-proof protection.
[0023] like Figures 2 to 4 and Figures 6 to 10As shown, the transformer assembly 3 includes mounting rods 31. The mounting rods 31 are equidistantly arranged on the side of the mounting frame 1 and positioned inside the protective cylinder 21. Each mounting rod 31 is a rectangular rod with a fan-shaped cross-section. The number of mounting rods 31 is set to an even number; in this embodiment, eight sets of mounting rods 31 are used, but the number can be adjusted as needed. Fixing rings 311 are symmetrically fixedly installed on the inner side of each mounting rod 31. The fixing rings 311 are circular rings with protrusions on their sides. All mounting rods 31 can be assembled into a single unit using the fixing rings 311. A fixing ring is fixedly installed on the inner side of the fixing rings 311 near the mounting frame 1. The mounting frame 32 is a snowflake-shaped frame. A motor 33 is fixedly mounted on the side of the mounting frame 1 away from the mounting rod 31, with the output end of the motor 33 passing through the mounting frame 1 and fixedly connected to the side of the fixed frame 32. A fixed coil group 34 is movably arranged between the mounting rods 31, and the electric contact rod 24 elastically contacts the electrical connection port on the side of the fixed coil group 34, thus establishing a circuit. A first moving coil group 35, a second moving coil group 351, a third moving coil group 352, and a fourth moving coil group 353 are respectively arranged on the side of the fixed coil group 34. The first moving coil group 35 and the fourth moving coil group 353 are equidistantly fixed on the side of the mounting rod 31. The power connection port of the fourth moving coil group 353, corresponding to the position of the fixed coil group 34, elastically contacts the electric contact rod 24 to complete the circuit connection. The number of coil turns on the sides of the first moving coil group 35, the second moving coil group 351, the third moving coil group 352, and the fourth moving coil group 353 are different. Specifically, the motor 33 can drive the fixing frame 32 to rotate. At this time, the whole formed by the fixing ring 311 and the mounting rod 31 can rotate. The first moving coil group 35, the second moving coil group 351, the third moving coil group 352, and the fourth moving coil group 353 can rotate. 352 and the fourth moving coil group 353 can rotate and move accordingly. In addition, the fixed coil group 34 can move in conjunction with subsequent components to complete the position correspondence with the first moving coil group 35, the second moving coil group 351, the third moving coil group 352 or the fourth moving coil group 353. When the first moving coil group 35, etc., rotates to the corresponding position, it will squeeze the corresponding electric contact rod 24, causing it to slide in the movable cavity 231. Finally, the front end of the electric contact rod 24 forms an elastic electric contact with the different moving coil group connection ports. At the same time, the fixed coil group 34 moves laterally, always maintaining elastic contact with the electric contact rod 24. The mounting frame 1 has an internal mounting cavity 36, which is an annular cavity. A trigger plate 361 is movably mounted inside the mounting cavity 36 and is fixedly sleeved on the side of the output end of the motor 33. The trigger plate 361 is a continuously cam-shaped annular plate. A sliding groove 37, penetrating the mounting frame 1, is provided on the wall of the mounting cavity 36 corresponding to the position of the fixed coil group 34. The sliding groove 37 is a rectangular groove. A sliding rod 341 is slidably mounted inside the sliding groove 37 and is fixedly mounted on the lower side of the fixed coil group 34. The sliding rod 341 is in close contact with the recessed side of the trigger plate 361. The sliding rod 341 is a "T"-shaped rod. A constraint block 371 is provided on the side of the sliding rod 341 and is slidably positioned in the sliding groove 37. Internally, the constraint block 371 is a rectangular block with one side curved. A constraint rod 372 is fixedly installed on the side of the constraint block 371 and is slidably disposed inside the mounting frame 1. A return spring 373 is fixedly connected to the side of the constraint rod 372 away from the constraint block 371, and the other end of the return spring 373 is fixedly disposed inside the mounting frame 1. Specifically, when the motor 33 drives the fixing frame 32 to rotate, the synchronous motor 33 drives the trigger plate 361 to rotate inside the mounting cavity 36. At this time, the protrusion of the trigger plate 361 can push the slide rod 341 to slide. The slide rod 341 squeezes the constraint block 371 and the constraint rod 372, causing the return spring 373 to deform under force. The fixed coil group 34 can then move laterally and disengage from the side of the mounting rod 31. The first moving coil group 35, the second moving coil group 351, the third moving coil group 352, and the fourth moving coil group 353 rotate and move in coordination. When one of these groups corresponds to the position of the fixed coil group 34, the return spring 373 elastically supports the constraint block 371 and the constraint rod 372, causing the slide rod 341 to fit against the recess of the trigger plate 361. The fixed coil group 34 is positioned between the mounting rods 31, allowing it to connect to the circuit with the corresponding first moving coil group 35, second moving coil group 351, third moving coil group 352, or fourth moving coil group 353. When external power is supplied to the fixed coil group 34, the fixed coil... Group 34 generates electromagnetic induction with the corresponding first moving coil group 35, second moving coil group 351, third moving coil group 352, or fourth moving coil group 353. Since the number of coil turns of the first moving coil group 35, second moving coil group 351, third moving coil group 352, and fourth moving coil group 353 are different, different voltages can be generated. The change of output voltage can realize the adjustment of output current, and the current can be reduced or increased accordingly. In addition, when a short circuit occurs, the motor 33 drives the protrusion of the trigger plate 361 to press the slide bar 341. At this time, the first moving coil group 35, second moving coil group 351, third moving coil group 352, and fourth moving coil group 353 do not contact the corresponding electric contact bar 24, thus completing the complete disconnection of the circuit and ensuring safety.
[0024] like Figure 4, Figure 6 , Figure 7 , Figure 10 and Figure 11 As shown, the heat dissipation assembly 4 includes a flow guide cavity 41, which is located inside the mounting bracket 1 corresponding to the mounting cavity 36. The flow guide cavity 41 is an annular cavity. A flow guide pipe 42 is symmetrically fixedly mounted on the side of the mounting bracket 1, extending into the flow guide cavity 41. The flow guide pipe 42 is connected to an external air supply module to supply inert gas. A first opening 43 and a second opening 44, equidistantly arranged in a circumferential array, are respectively provided on the wall of the flow guide cavity 41, penetrating the mounting bracket 1 and passing through the mounting cavity 36. The first opening 43 and the second opening 44 are cylindrical holes. A second opening 44, equidistantly arranged in a circumferential array, is also provided on the side of the trigger plate 361. The mounting rod 31 has a first mating hole 431, a second mating hole 432, and a third mating hole 441. The first mating hole 431 corresponds to the protrusion of the trigger plate 361, and the second and third mating holes 432 correspond to the recesses of the trigger plate 361. The first and second mating holes 431 and 432 can correspond to the first opening 43, and the third mating hole 441 can correspond to the second opening 44. A transition cavity 45 is provided on the lower side of the mounting rod 31, and the transition cavity 45 corresponds to the position of the first opening 43 by default. The transition cavity 45 is a cylindrical cavity. Vent holes 46 penetrating the mounting rod 31 are equidistantly provided on the two walls inside the transition cavity 45. The vent holes 46 are... A rectangular hole; specifically, during normal operation, when the fixed coil group 34 is in any corresponding position with the first moving coil group 35, the second moving coil group 351, the third moving coil group 352, or the fourth moving coil group 353, and is connected to the circuit with the electric contact rod 24, the transition cavity 45 corresponds to the position of the first opening 43, and the first mating hole 431 is connected to the first opening 43. The gas supply module outputs inert gas, which flows into the guide cavity 41 and then exits from the first opening 43 into the transition cavity 45. At this time, the gas can be discharged from the exhaust hole 46. With the fan module 221 working normally, gas flow can be generated for cooling operation; when the circuit is cut off, the first moving coil group 35. The second moving coil group 351, the third moving coil group 352 and the fourth moving coil group 353 do not contact the electric contact rod 24. At this time, the transition cavity 45 corresponds to the position of the first opening 43, the second mating hole 432 is connected to the first opening 43, and the third mating hole 441 is connected to the second opening 44. In this way, the gas inside the guide cavity 41 can flow through the first opening 43 to the transition cavity 45 and be discharged from the exhaust hole 46, or it can be discharged directly from the second opening 44. With the fan blades of the fan module 221 rotating in the opposite direction, the inert gas can quickly fill the inside of the protective cylinder 21, complete the protection of each component, and avoid sparks caused by rapid circuit breaking in the event of a short circuit.
[0025] Working principle: In normal use: First, the current is changed and switched according to the needs. Connection to the external circuit is completed through the power terminal 26. At this time, the fixed coil group 34 and the corresponding first moving coil group 35, second moving coil group 351, third moving coil group 352, or fourth moving coil group 353 are positioned relative to each other. The corresponding first moving coil group 35, second moving coil group 351, third moving coil group 352, or fourth moving coil group 353 are in elastic contact with the electric contact rod 24. The electric contact rod 24 and the power terminal 26 are connected by the connecting wire 27. After the fixed coil group 34 generates a certain magnetic field, the corresponding first moving coil group 35, second moving coil group 351, third moving coil group 352, or fourth moving coil group 353 cooperate to generate electromagnetic induction, thereby changing the magnitude of the transmitted voltage and thus changing the output current. The motor 33 drives the fixed frame 3. 2. When rotating, the mounting rod 31 can drive the first moving coil group 35, the second moving coil group 351, the third moving coil group 352, and the fourth moving coil group 353 to rotate and adjust their positions. At this time, the trigger plate 361 rotates inside the mounting cavity 36. The trigger plate 361 squeezes the slide rod 341, causing the fixed coil group 34 to move away from the side of the mounting rod 31 when the mounting rod 31 rotates. After the positions of the first moving coil group 35, the second moving coil group 351, the third moving coil group 352, and the fourth moving coil group 353 are fixed, the fixed coil group 34 is pushed back to the side of the mounting rod 31 by the constraint rod 372 and the constraint block 371. In this way, the automatic adjustment of the position of the fixed coil group 34 with the corresponding position of the first moving coil group 35, the second moving coil group 351, the third moving coil group 352, or the fourth moving coil group 353 can be completed. The second step involves coordinating heat dissipation during stable operation. When the fixed coil group 34 is used for transformer operation at the corresponding positions of the first moving coil group 35, the second moving coil group 351, the third moving coil group 352, or the fourth moving coil group 353, the first mating hole 431 is connected to the corresponding position of the first opening 43. The trigger plate 361 blocks the second opening 44, allowing the inert gas inside the guide cavity 41 to flow into the transition cavity 45 through the first opening 43 and finally be discharged from the exhaust hole 46. Simultaneously, the fan module 221 operates normally, discharging the gas inside the protective cylinder 21. This generates gas flow to dissipate heat inside the protective cylinder 21, ensuring operational stability. During safety protection: First, a rapid physical power-off is triggered. When the back end detects that two lines have been accidentally touched, a short circuit is generated. This is quickly detected by the detection terminal module component. The motor 33 quickly drives the trigger plate 361 to rotate, so that the protrusion of the trigger plate 361 presses against the side of the slide rod 341 and remains stationary. The fixed coil group 34 will then move away from the side of the mounting rod 31. The first moving coil group 35, the second moving coil group 351, the third moving coil group 352, and the fourth moving coil group 353 will all detach from the side of the contact rod 24 and not contact it. This maintains a complete physical disconnection of the circuit and ensures personal safety. The second step involves completing the explosion-proof protection. When the circuit is disconnected, the second mating hole 432 on the side of the trigger plate 361 connects with the corresponding position of the first opening 43, and the third mating hole 441 connects with the corresponding position of the second opening 44. The inert gas inside the guide cavity 41 can then be quickly discharged into the protective cylinder 21. In conjunction with the fan module 221 rotating in the opposite direction, the inert gas is agitated and accelerated to diffuse and mix within the protective cylinder 21, allowing it to quickly fill the entire space and complete the arc extinguishing and explosion-proof protection.
[0026] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited thereto. Various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention.
Claims
1. An isolation transformer capable of rapid current limiting, comprising a mounting frame (1), wherein a protective component (2), a transformer component (3) and a heat dissipation component (4) are provided on the side of the mounting frame (1). Its features are: The protective component (2) includes a protective cylinder (21), a fan module (221) and a connecting rod (23) are provided on the side of the protective cylinder (21), and an electric contact rod (24), a support cylinder (25), a power terminal (26) and a connecting wire (27) are provided inside the connecting rod (23). The transformer assembly (3) includes a mounting rod (31), a fixing ring (311) is symmetrically fixedly mounted on the inner side of the mounting rod (31), a motor (33) and a trigger plate (361) are provided on the lower side of the mounting rod (31), and a fixed coil group (34), a first moving coil group (35), a second moving coil group (351), a third moving coil group (352) and a fourth moving coil group (353) are provided on the side of the mounting rod (31). A slide rod (341), a constraint block (371), a constraint rod (372) and a return spring (373) are provided on the lower side of the fixed coil group (34). The heat dissipation assembly (4) includes a flow guide cavity (41). The wall of the flow guide cavity (41) is provided with a first opening (43) and a second opening (44) that penetrates the mounting bracket (1) at equal intervals. The side of the trigger plate (361) is provided with a first mating hole (431), a second mating hole (432) and a third mating hole (441) that penetrate it at equal intervals.
2. The isolation transformer with rapid current limiting according to claim 1, characterized in that: The protective cylinder (21) is fixedly installed at the center of the side of the mounting frame (1). The side of the protective cylinder (21) away from the mounting frame (1) is fixedly installed with a mounting plate (22). The fan module (221) is fixedly installed at the center of the side of the mounting plate (22). The air outlet of the fan module (221) is set in the opposite direction to the mounting frame (1).
3. The isolation transformer with rapid current limiting according to claim 2, characterized in that: The connecting rod (23) is symmetrically and fixedly installed through the side of the protective cylinder (21). The side of the connecting rod (23) has a movable cavity (231) that passes through it. The electric contact rod (24) is movably installed inside the movable cavity (231). The support cylinder (25) is fixedly connected between the side of the electric contact rod (24) and the wall of the movable cavity (231). The power terminal (26) is fixedly installed on the side of the connecting rod (23) away from the electric contact rod (24). The connecting wire (27) is fixedly connected between the side of the electric contact rod (24) and the side of the power terminal (26).
4. The isolation transformer with rapid current limiting according to claim 3, characterized in that: The mounting rods (31) are equidistantly arranged on the side of the mounting frame (1) and the mounting rods (31) are located inside the protective cylinder (21). A fixing frame (32) is fixedly installed on the inner side of the fixing ring (311) near the mounting frame (1). The motor (33) is fixedly installed on the side of the mounting frame (1) away from the mounting rods (31) and the output end of the motor (33) passes through the mounting frame (1) and is fixedly connected to the side of the fixing frame (32).
5. The isolation transformer with rapid current limiting according to claim 4, characterized in that: The fixed coil group (34) is movably arranged between the mounting rods (31) and the electric contact rod (24) elastically contacts the power connection port on the side of the fixed coil group (34) to connect the circuit. The first moving coil group (35), the second moving coil group (351), the third moving coil group (352) and the fourth moving coil group (353) are respectively fixedly arranged at equal distances on the side of the mounting rod (31).
6. The isolation transformer with rapid current limiting according to claim 5, characterized in that: The mounting frame (1) has an internal mounting cavity (36). The trigger plate (361) is movably disposed inside the mounting cavity (36) and is fixedly sleeved on the side of the output end of the motor (33). The trigger plate (361) is a circular ring plate with a continuous cam shape on the side. The wall of the mounting cavity (36) has a groove (37) corresponding to the position of the fixed coil group (34). The slide rod (341) is slidably disposed inside the groove (37) and is fixedly disposed on the lower side of the fixed coil group (34). The constraint block (371) is slidably disposed inside the groove (37) corresponding to the side of the slide rod (341). The constraint rod (372) is fixedly disposed on the side of the constraint block (371) and is slidably disposed inside the mounting frame (1). The reset spring (373) is fixedly connected to the side of the constraint rod (372) away from the constraint block (371).
7. The isolation transformer with rapid current limiting according to claim 6, characterized in that: The flow guide cavity (41) is opened inside the mounting frame (1) corresponding to the mounting cavity (36). The side of the mounting frame (1) is symmetrically fixed with a flow guide pipe (42) and the flow guide pipe (42) penetrates into the flow guide cavity (41). The first opening (43) and the second opening (44) are set through the mounting cavity (36). The lower side of the mounting rod (31) is provided with a transition cavity (45) and the transition cavity (45) corresponds to the position of the first opening (43). The two walls inside the transition cavity (45) are provided with exhaust holes (46) that penetrate the mounting rod (31) at equal intervals.
8. The isolation transformer with rapid current limiting according to claim 7, characterized in that: The first mating hole (431) corresponds to the protruding position of the trigger plate (361), the second mating hole (432) and the third mating hole (441) correspond to the recessed position of the trigger plate (361), the first mating hole (431) and the second mating hole (432) rotate to the position corresponding to the first opening (43), and the third mating hole (441) rotates to the position corresponding to the second opening (44).