Prefabricated transformer substation with leakage protection switch

Abstract

The invention relates to the field of transformer substations, in particular to a prefabricated transformer substation with a leakage protection switch, which comprises a box body and a leakage protection assembly, the box body is provided with a mounting cavity for mounting an electrical element, the leakage protection assembly comprises a leakage protector and a circuit breaker, and the leakage protector and the circuit breaker are connected to the electrical element at an interval. The electric leakage protector is electrically connected with the circuit breaker, and when the electric leakage protector detects electric leakage of the electrical element, the electric leakage protector controls the circuit breaker to trip. Through the arrangement of the leakage protector and the circuit breaker, when the leakage protector detects the electric leakage condition of the electrical element, the leakage protector drives the circuit breaker to trip to avoid the electric leakage condition of the electrical element, so that the use safety of the prefabricated substation is improved.

Description

Technical Field

[0001] The present application relates to the field of transformer substations, and in particular to a prefabricated transformer substation with a leakage protection switch. Background Art

[0002] Prefabricated substation is a kind of high-voltage switchgear, distribution transformer and low-voltage distribution device arranged in a factory according to a certain wiring method to form an integrated indoor and outdoor compact distribution equipment, that is, the transformer decompression and low-voltage distribution functions are organically combined together, and installed in a moisture-proof, rust-proof, dust-proof, rodent-proof, fire-proof, anti-theft, heat-insulating, fully enclosed and movable steel structure box. The substation replaces the original civil distribution room and becomes a new type of complete set of transformer and distribution equipment.

[0003] Prefabricated substations are equipped with fuses to protect circuit safety in order to improve the safety of power transmission. However, sometimes leakage occurs due to the aging of electrical components over a long period of time. Summary of the invention

[0004] In order to prevent the problem of leakage in a prefabricated substation, the present application provides a prefabricated substation with a leakage protection switch.

[0005] The present application provides a prefabricated substation with a leakage protection switch, which adopts the following technical solution: A prefabricated substation with a leakage protection switch comprises a box body and a leakage protection assembly, wherein the box body has an installation cavity for installing an electrical component, the leakage protection assembly comprises a leakage protector and a circuit breaker, the leakage protector and the circuit breaker are connected to the electrical component at intervals, the leakage protector is electrically connected to the circuit breaker, and when the leakage protector detects leakage of the electrical component, the leakage protector controls the circuit breaker to trip.

[0006] By adopting the above technical solution, the electrical components are installed on the inner wall of the installation cavity, and the box body shields the electrical components, so that the electrical components are not easily affected by external factors and damaged; at the same time, the leakage protector and the circuit breaker are installed on the electrical components at intervals. When the leakage protector detects that the electrical component is leaking, the leakage protector drives the circuit breaker to trip to avoid the occurrence of leakage of the electrical component, thereby improving the safety of the use of the prefabricated substation.

[0007] Optionally, the box is connected to a protective component, which includes a protective seat, an insulating airbag and an air pump. The protective seat is connected to the surface of the box, the insulating airbag is connected to the surface of the protective seat, and the air pump is connected to the surface of the protective seat. A supply air channel is opened on the surface of the protective seat facing the air outlet end of the air pump, and the supply air channel is connected to the inner cavity of the insulating airbag. When the circuit breaker trips, the air pump drives air into the inner cavity of the insulating airbag through the supply air channel, and the inner cavity of the insulating airbag is pressurized and expanded and abuts the surface of the box.

[0008] By adopting the above technical solution, when the circuit breaker trips, the air pump drives air into the inner cavity of the insulating airbag through the air supply channel. The inner cavity of the insulating airbag is pressurized and expanded and abuts against the surface of the box, making it difficult for pedestrians to accidentally touch the surface of the box and get electric shock, thereby ensuring the safety of pedestrians and improving the safety of the use of prefabricated substations.

[0009] Optionally, the protective assembly also includes a limit strip, a limit cavity for accommodating the insulating airbag is provided on the surface of the protective seat, the limit strip is connected to the end face of the insulating airbag away from the air pump, the outer peripheral surface of the limit strip can abut against the inner wall of the limit cavity and limit the insulating airbag in the limit cavity, and a groove for the limit strip to slide is provided on the surface of the protective seat, and when the inner cavity of the insulating airbag is pressurized and expanded, the limit strip is driven to slide along the inner wall of the groove in a direction away from the limit cavity.

[0010] By adopting the above technical scheme, the outer peripheral surface of the limit strip is pressed against the inner wall of the limit cavity and limits the insulating airbag in the limit cavity, so as to store the insulating airbag and make the insulating airbag less susceptible to damage by external factors, thereby improving the service life of the insulating airbag; at the same time, when the air pump drives air into the inner cavity of the insulating airbag through the air supply channel, the inner cavity of the insulating airbag is pressurized and expanded, driving the limit strip to slide along the inner wall of the slide groove in the direction away from the limit cavity, guiding the insulating airbag to expand and abut against the surface of the box body, thereby improving the stability of the insulating airbag in shielding the surface of the box body.

[0011] Optionally, the box body is connected to a limiting assembly, which includes a slider, a limiting piston, an elastic member 1 and an elastic member 2. A sliding cavity for sliding movement of the slider is provided on the surface of the box body, and the sliding direction of the slider and the sliding direction of the limiting strip are parallel to each other. The surface of the limiting strip can abut against the end surface of the slider protruding from the box body and drive the slider to slide on the inner wall of the sliding cavity. A positioning cavity for sliding movement of the limiting piston is provided on the inner wall of the sliding cavity. The sliding direction of the limiting piston and the sliding direction of the slider are perpendicular to each other. One end of the elastic member 1 in the elastic force direction is connected to the inner wall of the sliding cavity, and the other end of the elastic member 1 in the elastic force direction is connected to the surface of the slider. The elastic member 1 has elastic force to drive the slider to slide in the direction close to the positioning cavity, and the surface of the slider presses against the sliding cavity. The inner wall closes the positioning cavity, one end of the elastic part in the elastic direction is connected to the inner wall of the positioning cavity, and the other end of the elastic part in the elastic direction is connected to the surface of the limiting piston. The elastic part has a tendency to drive the limiting piston to slide in the direction away from the limiting cavity by elastic force, and a limiting groove for the end of the limiting piston to be embedded in the surface of the limiting piston toward the box body. When the limiting strip slides along the inner wall of the sliding groove in the direction away from the limiting cavity, the end face of the limiting strip abuts against the surface of the slider and drives the slider to slide in the direction away from the positioning cavity, and the sealing effect of the slider on the positioning cavity disappears, and the sliding cavity connects the positioning cavity and the limiting groove. The elastic force of the elastic part drives the limiting piston to slide in the direction close to the limiting groove, and the end of the limiting piston is embedded in the limiting groove to form a limit.

[0012] By adopting the above technical scheme, the elastic force of the elastic member 1 drives the slider to slide in the direction close to the positioning cavity, and the surface of the slider presses against the inner wall of the sliding cavity and closes the positioning cavity. When the air pump drives air into the inner cavity of the insulating airbag through the air supply channel, the inner cavity of the insulating airbag is pressurized and expanded and drives the limit strip to slide along the inner wall of the slide groove toward the direction close to the positioning cavity. The end face of the limit strip presses against the surface of the slider and drives the slider to slide in the direction away from the positioning cavity. The sealing effect of the slider on the positioning cavity disappears, and the sliding cavity connects the limit groove and the positioning cavity. The elastic force of the elastic member 2 drives the limit piston to slide in the direction close to the limit groove, and the end of the limit piston is embedded in the limit groove. The outer peripheral surface of the limit piston presses against the inner wall of the limit groove to form a limit, so that the limit strip is not easy to deviate on the inner wall of the slide groove, thereby improving the limiting stability of the limit strip on the inner wall of the slide groove.

[0013] Optionally, the limiting assembly also includes a positioning piston, and a positioning groove for the positioning piston to slide is opened on the surface of the box body. The sliding direction of the positioning piston and the sliding direction of the limiting bar are parallel to each other. The positioning groove is connected to the positioning cavity. When the limiting piston slides along the inner wall of the positioning cavity toward the limiting groove, the positioning piston is driven to slide toward the positioning cavity, and the end of the positioning piston protrudes from the surface of the box body.

[0014] By adopting the above technical scheme, when the elastic force of the second elastic member drives the positioning piston to slide along the inner wall of the positioning cavity toward the direction close to the limiting groove, the air pressure in the positioning cavity is reduced, driving the positioning piston to slide along the inner wall of the positioning groove toward the direction close to the positioning cavity, and the end of the positioning piston protruding from the box body is provided for the staff to hold and pull. When the insulating airbag needs to be stored, the staff holds the end of the positioning piston protruding from the box body and drives the positioning piston to slide in the direction away from the positioning cavity. The air pressure in the positioning groove is reduced, driving the limiting piston to slide along the inner wall of the positioning cavity toward the direction away from the positioning groove, and the end of the limiting piston is separated from the positioning groove, so that the limiting effect of the limiting piston on the limiting strip disappears, thereby facilitating the directional start of the limiting strip on the inner wall of the slide groove.

[0015] Optionally, the limiting assembly also includes a heat dissipation impeller, which is rotatably connected to the inner wall of the installation cavity, the air outlet end of the heat dissipation impeller faces the electrical component, an outlet air channel is opened on the inner wall of the installation cavity facing the heat dissipation impeller blades, the outlet air channel is connected to the positioning cavity, a connecting flow channel is opened on the surface of the limiting piston facing the outlet air channel, the connecting flow channel penetrates the surface of the limiting piston in the direction close to the limiting groove, and a through flow channel is opened on the inner wall of the limiting groove facing the connecting flow channel, the through flow channel is connected to the inner cavity of the insulating airbag, when the end of the limiting piston is embedded in the limiting groove, the connecting flow channel connects the outlet air channel and the through flow channel, the air in the insulating airbag passes through the through flow channel, the connecting flow channel in turn and impacts the heat dissipation impeller blades from the outlet air channel, and the heat dissipation impeller rotates and guides the air to impact the electrical component.

[0016] By adopting the above technical scheme, when the limit bar slides along the inner wall of the slide groove toward the positioning cavity, the end of the limit piston is embedded in the limit groove, the connecting flow channel connects the outlet flow channel and the through flow channel, and the air in the insulating airbag passes through the through flow channel and the connecting flow channel in turn and impacts the heat dissipation impeller blades from the outlet flow channel. The heat dissipation impeller rotates and guides the air to impact the surface of the electrical components, so that the electrical components are fully in contact with the air and enter into heat exchange, thereby achieving cooling of the electrical components, making it less likely for the electrical components to be worn out in a high temperature state for a long time, thereby extending the service life of the prefabricated substation.

[0017] Optionally, the limit bar is connected to an opening and closing component, which includes an opening and closing plate and an elastic member three. A rotating cavity for the opening and closing plate to rotate is opened on the inner wall of the limit groove. One end of the elastic member three in the elastic force direction is connected to the inner wall of the rotating cavity, and the other end of the elastic member three in the elastic force direction is connected to the rotating shaft of the opening and closing plate. The elastic member three has elastic force to drive the opening and closing plate to rotate toward the direction close to the box body, and the opening and closing plate surface presses against the inner wall of the rotating cavity and closes the limit groove. When the end of the limit piston is embedded in the limit groove, the end of the limit piston presses against the opening and closing plate surface and drives the opening and closing plate to rotate in the direction away from the box body, and the closing effect of the opening and closing plate on the limit groove disappears.

[0018] By adopting the above technical scheme, the three elastic forces of the elastic member drive the opening and closing plate to rotate toward the direction close to the box body, and the surface of the opening and closing plate presses against the inner wall of the rotating cavity and closes the limit groove, so that the air pump stably drives the air to be injected into the inner cavity of the insulating airbag through the air supply channel. The inner cavity of the insulating airbag is pressurized and expanded, driving the limit strip to slide toward the direction close to the positioning cavity, and the end of the limit piston is embedded in the limit groove. The end of the limit piston presses against the surface of the opening and closing plate and guides the opening and closing plate to rotate in the direction away from the box body, and the closing effect of the opening and closing plate on the limit groove disappears, thereby realizing directional opening and closing of the limit groove.

[0019] Optionally, the box body is connected to a cooling component, the cooling component includes a cooling impeller and a start strip, the cooling impeller is rotatably connected to the inner wall of the installation cavity, the rotation axis of the cooling impeller and the axis of the heat dissipation impeller are parallel to each other, the inner wall of the air supply channel is provided with a starting cavity for the sliding of the start strip, the surface of the start strip facing the insulating airbag is provided with an insulating flow channel, the surface of the installation cavity facing the cooling impeller blades is provided with an inlet flow channel, the inlet flow channel runs through the outer wall of the box body, and the surface of the protective seat facing the inlet flow channel is provided with a heat dissipation flow channel The heat dissipation channel is connected to the starting cavity, and a cooling channel is provided on the surface of the starting strip facing the heat dissipation channel. When the starting strip slides toward the insulating airbag, the insulating channel connects the inner cavity of the insulating airbag and the air supply channel; when the starting strip slides toward the cooling impeller, the cooling channel connects the air supply channel and the heat dissipation channel. The air pump drives air to pass through the air supply channel, the cooling channel, and the heat dissipation channel in sequence and impact the cooling impeller blades from the air inlet channel. The cooling impeller rotates and drives the air to impact the electrical components.

[0020] By adopting the above technical scheme, when the prefabricated substation operates normally, the start strip is driven to slide in the direction close to the cooling impeller, the cooling flow channel connects the air supply channel and the heat dissipation flow channel, the air pump drives the air to pass through the air supply channel, the cooling flow channel, the heat dissipation flow channel in turn and impact the cooling impeller blades from the air intake channel, the cooling impeller rotates and drives the air to impact the surface of the electrical components, the surface of the electrical components is fully in contact with the air and heat exchange is carried out, so as to achieve the cooling of the electrical components, so that the electrical components are not easily worn out due to long-term operation at high temperature, thereby extending the service life of the prefabricated substation; at the same time, when the electrical components have a leakage, the start strip is driven to slide in the direction close to the insulating airbag, the insulating flow channel connects the inner cavity of the insulating airbag and the air supply channel, the air pump drives the air to pass through the air supply channel and the insulating flow channel in turn and enter the inner cavity of the insulating airbag, the inner cavity of the insulating airbag is pressurized and expanded, and the surface of the insulating airbag abuts against the surface of the box to form a barrier, so that pedestrians are not likely to accidentally touch the surface of the box and get electric shock, thereby improving the safety of the use of the prefabricated substation.

[0021] Optionally, the cooling component further includes a gear, a rack, a magnetic block, an electromagnet and an elastic member; a protective cavity for the gear to rotate is provided on the surface of the protective seat; the starting cavity is connected to the protective cavity; a tooth groove meshing with the gear is provided on the surface of the starting bar; the rack is slidably connected to the inner wall of the protective cavity; the rack meshes with the gear, and the sliding direction of the rack and the sliding direction of the starting bar are parallel to each other; the electromagnet is connected to the inner wall of the protective cavity; the electromagnet is electrically connected to the leakage protector; the magnetic block is connected to the surface of the rack facing the electromagnet; When the leakage protector detects that the electrical component is leaking, the electromagnet is controlled to be energized, and the electromagnet and the magnetic block repel each other with the same poles, driving the rack to slide, and the gear rotates, driving the start bar to slide in the direction close to the insulating airbag. One end of the elastic part in the elastic force direction is connected to the inner wall of the protective cavity, and the other end of the elastic part in the elastic force direction is connected to the surface of the rack. The elastic force of the elastic part is smaller than the magnetic force of the electromagnet. The elastic part has the elastic force to drive the rack to slide, and drives the start bar to slide in the direction close to the cooling impeller.

[0022] By adopting the above technical scheme, the four elastic forces of the elastic member drive the rack to slide, drive the gear to rotate, and drive the starter strip to slide in the direction close to the cooling impeller, and the cooling flow channel connects the air supply flow channel and the heat dissipation flow channel; when the leakage protector detects that the electrical component is leaking, the leakage protector controls the electromagnet to be energized with magnetic force, the magnetic force of the electromagnet is greater than the four elastic forces of the elastic member, the electromagnet and the magnetic block repel each other with the same poles, and drive the rack to slide in the opposite direction along the inner wall of the protective cavity, the gear rotates, and drives the starter strip to slide in the direction close to the insulating airbag, the insulating flow channel connects the air supply flow channel and the inner cavity of the insulating airbag, and realizes the directional sliding of the starter strip.

[0023] Optionally, the cooling component also includes a limit rod, the end of the limit rod is connected to the gear rotating shaft, and the inner wall of the limit cavity facing the protective cavity is provided with a fixed groove for the end of the limit rod to be embedded in. When the elastic force of the elastic member drives the rack to slide, the gear rotates, driving the limit rod to rotate in the direction close to the fixed groove, and the end of the limit rod is embedded in the fixed groove. The end of the limit rod abuts against the inner wall of the fixed groove to form a limit and limit the limit rod in the limit cavity. When the same poles of the electromagnet and the magnetic block repel each other and drive the rack to slide, the gear rotates, driving the limit rod to rotate in the direction away from the fixed groove, and the end of the limit rod disengages from the fixed groove.

[0024] By adopting the above technical scheme, when the elastic force of the elastic member drives the rack to slide on the inner wall of the protective cavity, the gear rotates, driving the limit rod to rotate in the direction close to the fixed groove, and the end of the limit rod is embedded in the fixed groove, and the rod surface of the limit rod is pressed against the inner wall of the fixed groove to form a limit, so that the limit bar is not easy to separate from the limit cavity, thereby improving the limiting stability of the limit bar in the limit cavity; when the electromagnet is energized and has magnetic force, the electromagnet and the magnetic block repel each other with the same poles, driving the rack to slide in the opposite direction along the inner wall of the protective cavity, and the gear rotates, driving the limit rod to slide in the direction away from the fixed groove, and the end of the limit rod is separated from the fixed groove, so that the limiting effect of the limit rod on the limit bar disappears, and the directional sliding of the limit bar is achieved.

[0025] In summary, the present application includes at least one of the following beneficial technical effects: 1. The setting of leakage protector and circuit breaker. When the leakage protector detects leakage of electrical components, the leakage protector drives the circuit breaker to trip to avoid leakage of electrical components, thereby improving the safety of the use of prefabricated substation; 2. The protection seat, insulating airbag and air pump are set up. The inner cavity of the insulating airbag is pressurized and expanded and abuts against the surface of the box, so that pedestrians are not likely to accidentally touch the surface of the box and get electric shock, thereby ensuring the safety of pedestrians and improving the safety of the use of prefabricated substations; 3. The setting of the limit strip causes the inner cavity of the insulating airbag to be pressurized and expand, driving the limit strip to slide along the inner wall of the slide groove in the direction away from the limit strip, guiding the insulating airbag to expand and abut against the surface of the box, thereby improving the stability of the insulating airbag in shielding the surface of the box. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure in the embodiment of the present application.

[0027] Figure 2 It is a partial cross-sectional view in an embodiment of the present application, mainly showing the transmission assembly.

[0028] Figure 3 It is a schematic diagram of the overall structure of the opening and closing assembly in the embodiment of the present application.

[0029] Figure 4 It is a partial cross-sectional view in an embodiment of the present application, mainly showing the cooling component.

[0030] Figure 5 It is a partial cross-sectional view in the embodiment of the present application, mainly showing the magnetic block and the electromagnet.

[0031] Figure 6 It is a partial cross-sectional view in an embodiment of the present application, mainly showing the insulating flow channel and the cooling flow channel.

[0032] Figure 7 It is a schematic diagram of the overall structure of the protection seat in the embodiment of the present application, mainly showing the protection cavity.

[0033] Figure 8 It is a schematic diagram of the overall structure of the protective seat in the embodiment of the present application, mainly showing the fixing groove.

[0034] Description of reference numerals: 1, box body; 11, installation cavity; 12, sliding cavity; 13, positioning cavity; 14, positioning groove; 15, outlet air passage; 16, inlet air passage; 2, leakage protection component; 21, leakage protector; 3, box door; 4, protection component; 41, protection seat; 411, limit cavity; 412, air supply channel; 413, slide groove; 414, starting cavity; 415, heat dissipation channel; 416, protection cavity; 417, fixing groove; 42, insulating air bag; 43, air pump; 44, limit strip; 441, limit groove; 442, through-flow channel; 443 , rotating chamber; 5, limiting assembly; 51, slider; 52, limiting piston; 521, connecting flow channel; 53, elastic part one; 54, elastic part two; 55, positioning piston; 56, heat dissipation impeller; 6, opening and closing assembly; 61, opening and closing plate; 62, elastic part three; 7, cooling assembly; 71, cooling impeller; 72, starting strip; 721, insulating flow channel; 722, cooling flow channel; 73, rack; 74, gear; 75, magnetic block; 76, electromagnet; 77, elastic part four; 78, limiting rod; 8, transmission assembly; 81, transmission belt; 82, transmission wheel. DETAILED DESCRIPTION

[0035] The following is combined with Figure 1-8 This application is described in further detail.

[0036] The present application embodiment discloses a prefabricated substation with a leakage protection switch. Figure 1 The prefabricated substation with a leakage protection switch includes a box body 1 and a leakage protection assembly 2. The bottom of the box body 1 abuts against the ground to form a support. The surface of the box body 1 is provided with an installation cavity 11 for installing an electrical component. The inner wall of the installation cavity 11 is rotatably connected with a box door 3. The rotation axis of the box door 3 and the height direction of the box body 1 are parallel to each other. When the box door 3 rotates toward the direction close to the installation cavity 11, the outer peripheral surface of the box door 3 abuts against the inner wall of the installation cavity 11 and closes the installation cavity 11, so that foreign matter is not easy to enter the installation cavity 11 to interfere with the operation of the electrical components; the leakage protection assembly 2 includes a leakage protection The number of leakage protectors 21 can be one, two or more. In the embodiment of the present application, the number of leakage protectors 21 is multiple, and multiple leakage protectors 21 are connected on the surface of the electrical component at intervals. The circuit breaker is connected to the electrical component. The circuit breaker is electrically connected to the multiple leakage protectors 21. When the leakage protector 21 detects that the electrical component is leaking, the leakage protector 21 controls the circuit breaker to trip, thereby realizing power-off protection for the prefabricated substation and avoiding the occurrence of leakage of electrical components, thereby improving the safety of the use of the prefabricated substation.

[0037] Reference Figure 1 and Figure 2 The box body 1 is equipped with a protection component 4, which protects and insulates the outer periphery of the box body 1. The number of protection components 4 can be one, two or more. In the embodiment of the present application, the number of protection components 4 is two, and the two protection components 4 are connected one by one to both sides of the length direction of the box body 1. The protection component 4 includes a protection seat 41, an insulating airbag 42, an air pump 43 and a limit strip 44. The protection seat 41 is fixed to the surface of the box body 1 by bolts. The material of the insulating airbag 42 can be rubber or plastic. In the embodiment of the present application, the material of the insulating airbag 42 is rubber, which has good insulation performance. A limit cavity 411 for accommodating the insulating airbag 42 is opened on the surface of the protection seat 41. The air pump 43 is fixed to the surface of the protection seat 41 by bolts. A supply air channel 412 is opened on the surface of the protection seat 41 facing the air outlet end of the air pump 43. The supply air channel 412 runs through the surface of the protection seat 41 and is connected to the inner cavity of the insulating airbag 42. The air pump 43 drives air into the inner cavity of the insulating airbag 42 through the supply air channel 412 to achieve directional inflation of the insulating airbag 42.

[0038] Reference Figure 1 and Figure 2 The limit strip 44 is fixed on the end face of the insulating airbag 42 away from the air pump 43, and the limit strip 44 is embedded in the limit cavity 411. The outer peripheral surface of the limit strip 44 abuts against the inner wall of the limit cavity 411 and limits the insulating airbag 42 in the limit cavity 411. The surface of the protective seat 41 is provided with a slide groove 413 for the sliding of the limit strip 44. The sliding direction of the limit strip 44 is parallel to the width direction of the box 1. The slide groove 413 is connected to the limit cavity 411. When the air pump 43 drives air into the inner cavity of the insulating airbag 42 through the air supply channel 412, the inner cavity of the insulating airbag 42 is pressurized and expanded, driving the limit strip 44 to slide along the inner wall of the slide groove 413 in the direction away from the limit cavity 411. The surface of the insulating airbag 42 abuts against the surface of the box 1 to form protection, so that pedestrians are not likely to accidentally touch the surface of the box 1 and get electric shock, thereby improving the safety of the use of the prefabricated substation.

[0039] Reference Figure 1 and Figure 2The box body 1 is provided with a limit assembly 5, which can limit the limit bar 44 to the inner wall of the slide groove 413. The limit assembly 5 includes a slider 51, a limit piston 52, an elastic member 1 53, an elastic member 2 54, a positioning piston 55 and a heat dissipation impeller 56. A sliding cavity 12 for the slider 51 to slide is provided on the surface of the box body 1. The sliding direction of the slider 51 and the sliding direction of the limit bar 44 are parallel to each other. The surface of the limit bar 44 can abut against the end surface of the slider 51 protruding from the box body 1 and drive the slider 51 to slide on the inner wall of the sliding cavity 12. The material of the limit piston 52 and the positioning piston 55 can be rubber or silicone. In the embodiment of the present application, the material of the limit piston 52 and the positioning piston 55 are both rubber, which has a certain deformation ability and can slide smoothly. A positioning cavity 13 for the limiting piston 52 to slide is formed on the inner wall of the displacement cavity 12. The sliding direction of the limiting piston 52 is parallel to the length direction of the box body 1. The elastic member 53 and the elastic member 54 can be compression springs or tension springs. In the embodiment of the present application, the elastic member 53 and the elastic member 54 are both compression springs with a certain deformation ability. One end of the elastic member 53 in the elastic direction is connected to the inner wall of the sliding cavity 12, and the other end of the elastic member 53 in the elastic direction is connected to the surface of the slider 51. The elastic member 53 is located on the side of the slider 51 away from the limiting strip 44. The elastic member 53 has elastic force to drive the slider 51 to slide in the direction close to the positioning cavity 13. The surface of the slider 51 presses against the inner wall of the sliding cavity 12 and tends to close the positioning cavity 13.

[0040] Reference Figure 1 and Figure 2 A limiting groove 441 is provided on the surface of the limiting strip 44 facing the positioning cavity 13 for the end of the limiting piston 52 to be embedded. One end of the elastic member 54 in the elastic direction is connected to the inner wall of the positioning cavity 13, and the other end of the elastic member 54 in the elastic direction is connected to the surface of the limiting piston 52. The elastic member 54 has a tendency to drive the limiting piston 52 to slide in the direction close to the limiting groove 441 by elastic force; a positioning groove 14 is provided on the surface of the box body 1 for the positioning piston 55 to slide, and the sliding direction of the positioning piston 55 is parallel to the width direction of the box body 1. The positioning groove 14 is connected to the positioning cavity 13, and the end of the positioning piston 55 protruding from the surface of the box body 1 is for the user to hold.

[0041] Reference Figure 1 and Figure 2When the inner cavity of the insulating airbag 42 is pressurized and expanded, the limit strip 44 is driven to slide along the inner wall of the slide groove 413 toward the direction close to the slider 51. The end face of the limit strip 44 abuts against the end face of the slider 51 protruding from the box body 1, and drives the slider 51 to slide along the inner wall of the sliding cavity 12 toward the direction away from the positioning cavity 13. The sealing effect of the slider 51 on the positioning cavity 13 disappears, and the elastic force of the elastic member 54 drives the slider 51 to slide in the direction close to the limit groove 441. The end of the limit piston 52 is embedded in the limit groove 441, and the outer peripheral surface of the limit piston 52 is pressed against the inner wall of the limit groove 441 to form a limit, so that the limit strip 44 is not easy to deviate on the inner wall of the slide groove 413, thereby improving the limit strip 44 in the slide groove 41 3. At the same time, the air pressure in the positioning cavity 13 is reduced, and the positioning groove 14 is connected to the positioning cavity 13, driving the positioning piston 55 to slide along the inner wall of the positioning groove 14 toward the positioning cavity 13. When it is necessary to push the limiting strip 44 to slide, the user holds the end of the positioning piston 55 and drives the positioning piston 55 to slide along the inner wall of the positioning groove 14 toward the direction away from the positioning cavity 13. The air pressure in the positioning cavity 13 is reduced, driving the limiting piston 52 to slide along the inner wall of the positioning cavity 13 toward the direction away from the limiting groove 441. The end of the limiting piston 52 is separated from the limiting groove 441, so that the limiting effect of the limiting piston 52 on the limiting strip 44 disappears, and the directional sliding of the limiting strip 44 is achieved.

[0042] Reference Figure 1 and Figure 2 The heat dissipation impeller 56 is rotatably connected to the inner wall of the installation cavity 11, the rotation axis of the heat dissipation impeller 56 and the length direction of the box body 1 are parallel to each other, the air outlet end of the heat dissipation impeller 56 faces the electrical component, and an outlet air channel 15 is opened on the inner wall of the installation cavity 11 facing the blades of the heat dissipation impeller 56, and the outlet air channel 15 is connected to the positioning cavity 13. A connecting flow channel 521 is opened on the surface of the limiting piston 52 facing the outlet air channel 15, and the connecting flow channel 521 penetrates the surface of the limiting piston 52 in the direction close to the limiting groove 441. A through flow channel 442 is opened on the inner wall of the limiting groove 441 facing the connecting flow channel 521, and the through flow channel 442 is connected to the inner cavity of the insulating airbag 42.

[0043] Reference Figure 1 and Figure 2 When the end of the limiting piston 52 is embedded in the limiting groove 441, the connecting flow channel 521 connects the outlet flow channel 15 and the through flow channel 442. The air in the insulating airbag 42 passes through the through flow channel 442 and the connecting flow channel 521 in turn and impacts the blades of the heat dissipation impeller 56 from the outlet flow channel 15. The heat dissipation impeller 56 rotates and drives the air to impact the surface of the electrical components. The electrical components are fully in contact with the air and heat exchange is carried out to achieve cooling of the electrical components, thereby improving the cooling efficiency of the prefabricated substation.

[0044] Reference Figure 2 and Figure 3The limit bar 44 is equipped with an opening and closing component 6, which can control the opening and closing of the limit groove 441. The opening and closing component 6 includes an opening and closing plate 61 and an elastic member 3 62. The elastic member 3 62 can be a tension spring or a torsion spring. In the embodiment of the present application, the elastic member 3 62 is a torsion spring with a certain deformation ability. A rotating cavity 443 for rotating the opening and closing plate 61 is provided on the inner wall of the limit groove 441. The rotation axis of the opening and closing plate 61 and the height direction of the box body 1 are parallel to each other. One end of the elastic member 3 62 in the elastic force direction is connected to the rotating shaft of the opening and closing plate 61, and the other end of the elastic member 3 62 in the elastic force direction is connected to the inner wall of the rotating cavity 443. The elastic member 3 62 has the elastic force to drive the opening and closing plate 61 to rotate in the direction close to the box body 1, and the plate surface of the opening and closing plate 61 presses against the inner wall of the rotating cavity 443 and closes the limit groove 441.

[0045] Reference Figure 2 and Figure 3 The elastic coefficient of the elastic member three 62 is smaller than the elastic coefficient of the elastic member two 54. When the elastic force of the elastic member two 54 drives the end of the limiting piston 52 to embed into the limiting groove 441, the end of the limiting piston 52 abuts against the surface of the opening and closing plate 61 and drives the opening and closing plate 61 to rotate in the direction away from the box body 1. The tight contact between the opening and closing plate 61 and the inner wall of the rotating chamber 443 disappears, thereby realizing the directional opening and closing of the limiting groove 441.

[0046] Reference Figure 4 and Figure 5 The box body 1 is equipped with a cooling component 7, which can cool the electrical components in the installation cavity 11. The cooling component 7 includes a cooling impeller 71, a start bar 72, a rack 73, a gear 74, a magnetic block 75, an electromagnet 76, an elastic member 77 and a limit rod 78. The cooling impeller 71 is rotatably connected to the inner wall of the installation cavity 11, and the rotation axis of the cooling impeller 71 and the rotation axis of the heat dissipation impeller 56 are parallel to each other, and the air outlet end of the cooling impeller 71 faces the electrical components.

[0047] Reference Figure 4 and Figure 6 A starting cavity 414 for the starting strip 72 to slide is formed on the inner wall of the air supply channel 412, and the sliding direction of the starting strip 72 is parallel to the height direction of the box body 1. An insulating flow channel 721 is formed on the surface of the starting strip 72 close to the insulating airbag 42, and the insulating flow channel 721 penetrates the outer wall of the starting strip 72. An inlet flow channel 16 is formed on the inner wall of the mounting cavity 11 toward the cooling impeller 71, and the inlet flow channel 16 penetrates the outer wall of the box body 1 toward the direction close to the protective seat 41. A heat dissipation flow channel 415 is formed on the surface of the protective seat 41 toward the inlet flow channel 16, and the heat dissipation flow channel 415 is connected to the starting cavity 414. A cooling flow channel 722 is formed on the surface of the starting strip 72 toward the heat dissipation flow channel 415, and the cooling flow channel 722 penetrates the outer wall of the starting strip 72 toward the direction close to the air supply channel 412.

[0048] Reference Figure 4 and Figure 5 The surface of the protective seat 41 is provided with a protective cavity 416 for the gear 74 to rotate. The rotation axis of the gear 74 is parallel to the width direction of the box body 1. The protective cavity 416 is connected to the starting cavity 414. The surface of the starting bar 72 is provided with a tooth groove meshing with the tooth surface of the gear 74. The rack 73 is slidably connected to the inner wall of the protective cavity 416. The sliding direction of the rack 73 and the sliding direction of the starting bar 72 are parallel to each other. The rack 73 and the starting bar 72 are located on the same side of the gear 74, and the rack 73 meshes with the gear 74; the electromagnetic The iron 76 is connected to the inner wall of the protective cavity 416 facing the rack 73, the magnetic block 75 is connected to the end face of the rack 73 facing the electromagnet 76, the elastic part four 77 can be a compression spring or a tension spring. In the embodiment of the present application, the elastic part four 77 is a compression spring with a certain deformation ability. One end of the elastic part four 77 in the elastic force direction is connected to the inner wall of the protective cavity 416, and the other end of the elastic part four 77 in the elastic force direction is connected to the surface of the rack 73 with the magnetic block 75. The elastic force of the elastic part four 77 is less than the magnetic force of the electromagnet 76.

[0049] Reference Figure 1 and Figure 4 , the electromagnet 76 is electrically connected to the leakage protector 21, the elastic force of the elastic member 77 drives the rack 73 to slide in the direction close to the electromagnet 76, the rack 73 meshes with the gear 74, drives the gear 74 to rotate, drives the starter strip 72 to slide along the inner wall of the starter chamber 414 in the direction close to the heat dissipation channel 415, the cooling channel 722 connects the supply channel 412 and the heat dissipation channel 415, the air pump 43 drives the air to pass through the supply channel 412, the cooling channel 722, and the heat dissipation channel 415 in sequence and impact the blades of the cooling impeller 71 from the inlet channel 16, the cooling impeller 71 rotates and drives the air to impact the surface of the electrical components to achieve cooling of the electrical components; when the leakage protector 21 is turned on, the air is driven to rotate and the air is driven ... When the protector 21 detects leakage, the leakage protector 21 controls the electromagnet 76 to be energized. The electromagnet 76 is energized and has magnetic force. The electromagnet 76 and the magnetic block 75 repel each other with the same poles. The rack 73 is affected by the magnetic force and moves away from the electromagnet 76. The rack 73 engages with the gear 74, driving the gear 74 to rotate, driving the starter bar 72 to slide along the inner wall of the starter chamber 414 in the direction away from the heat dissipation channel 415. The insulating channel 721 connects the inner cavity of the insulating airbag 42 and the air supply channel 412. The air pump 43 drives air from the insulating channel 721 through the air supply channel 412 into the inner cavity of the insulating airbag 42. The inner cavity of the insulating airbag 42 is pressurized and expanded, thereby realizing directional inflation of the insulating airbag 42.

[0050] Reference Figure 7 and Figure 8The end of the limiting rod 78 is fixed on the rotating shaft of the gear 74, and a fixing groove 417 is opened on the inner wall of the limiting cavity 411 facing the protective cavity 416, in which the end of the limiting rod 78 is embedded. When the elastic force of the elastic member 77 drives the rack 73 to slide, the gear 74 rotates, driving the limiting rod 78 to rotate around the axis of the gear 74 in the direction close to the fixing groove 417, and the end of the limiting rod 78 is embedded in the fixing groove 417, and the outer peripheral surface of the limiting rod 78 is pressed against the inner wall of the fixing groove 417 to form a limit, and the limiting bar 44 is limited in the limiting cavity 411; when the end of the electromagnet 76 and the magnetic block 75 repel each other with the same poles to drive the rack 73 to slide, the gear 74 rotates, driving the limiting rod 78 to rotate around the axis of the gear 74 in the direction away from the fixing groove 417, and the end of the limiting rod 78 is separated from the fixing groove 417 and embedded in the protective cavity 416, the limiting effect of the limiting rod 78 on the limiting bar 44 disappears, and the storage of the limiting rod 78 is achieved.

[0051] Reference Figure 2 A transmission assembly 8 is connected between the cooling impeller 71 and the heat dissipation impeller 56. The transmission assembly 8 includes two transmission wheels 82 and a transmission belt 81 used in conjunction with the transmission wheels 82. One of the transmission wheels 82 is coaxially fixed on the rotating shaft of the cooling impeller 71, and the other transmission wheel 82 is coaxially connected to the rotating shaft of the heat dissipation impeller 56. The transmission belt 81 is tensioned to connect the two transmission wheels 82, so that the cooling impeller 71 and the heat dissipation impeller 56 always keep in a rotating state, thereby improving the cooling efficiency of the electrical components in the installation cavity 11.

[0052] The implementation principle of a prefabricated substation with a leakage protection switch in an embodiment of the present application is as follows: when the leakage protector 21 detects leakage in an electrical component, the leakage protector 21 controls the circuit breaker to trip, thereby realizing power-off protection for the prefabricated substation and avoiding the occurrence of leakage in the electrical component, thereby improving the safety of the use of the prefabricated substation.

[0053] 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 prefabricated substation with a leakage protection switch, characterized in that: The invention comprises a box (1) and a leakage protection assembly (2), wherein the box (1) has an installation cavity (11) for installing an electrical component, and the leakage protection assembly (2) comprises a leakage protector (21) and a circuit breaker, wherein the leakage protector (21) and the circuit breaker are connected to the electrical component at intervals, and the leakage protector (21) is electrically connected to the circuit breaker, and when the leakage protector (21) detects that the electrical component is leaking electricity, the leakage protector (21) controls the circuit breaker to trip.

2. The prefabricated substation with leakage protection switch according to claim 1 is characterized in that: The box body (1) is connected to a protection component (4), and the protection component (4) comprises a protection seat (41), an insulating air bag (42) and an air pump (43); the protection seat (41) is connected to the surface of the box body (1); the insulating air bag (42) is connected to the surface of the protection seat (41); the air pump (43) is connected to the surface of the protection seat (41); a supply air passage (412) is provided on the surface of the protection seat (41) facing the air outlet of the air pump (43); the supply air passage (412) is connected to the inner cavity of the insulating air bag (42); when the circuit breaker trips, the air pump (43) drives air into the inner cavity of the insulating air bag (42) through the supply air passage (412); the inner cavity of the insulating air bag (42) is pressurized and expanded and abuts against the surface of the box body (1).

3. The prefabricated substation with leakage protection switch according to claim 2 is characterized in that: The protection assembly (4) further comprises a limit strip (44); a limit cavity (411) for accommodating the insulating airbag (42) is provided on the surface of the protection seat (41); the limit strip (44) is connected to the end face of the insulating airbag (42) away from the air pump (43); the outer peripheral surface of the limit strip (44) can abut against the inner wall of the limit cavity (411) and limit the insulating airbag (42) in the limit cavity (411); a slide groove (413) for the limit strip (44) to slide is provided on the surface of the protection seat (41); when the inner cavity of the insulating airbag (42) is pressurized and expanded, the limit strip (44) is driven to slide along the inner wall of the slide groove (413) in a direction away from the limit cavity (411).

4. The prefabricated substation with leakage protection switch according to claim 3 is characterized in that: The box body (1) is connected to a limit assembly (5), the limit assembly (5) comprising a slider (51), a limit piston (52), an elastic member 1 (53) and an elastic member 2 (54); a sliding cavity (12) for the slider (51) to slide is provided on the surface of the box body (1); the sliding direction of the slider (51) and the sliding direction of the limit strip (44) are parallel to each other; the surface of the limit strip (44) can abut against the end surface of the slider (51) protruding from the box body (1) and drive the slider (51) to slide on the inner wall of the sliding cavity (12); the sliding cavity ( The inner wall of the sliding block (12) is provided with a positioning cavity (13) for the sliding movement of the limiting piston (52); the sliding direction of the limiting piston (52) and the sliding direction of the sliding block (51) are perpendicular to each other; one end of the elastic member (53) in the elastic direction is connected to the inner wall of the sliding cavity (12); the other end of the elastic member (53) in the elastic direction is connected to the surface of the sliding block (51); the elastic member (53) has an elastic force to drive the sliding block (51) to slide in a direction close to the positioning cavity (13); and the surface of the sliding block (51) is pressed against the inner wall of the sliding cavity (12) and seals the sliding block (51). The positioning cavity (13) is closed, one end of the elastic member (54) in the elastic direction is connected to the inner wall of the positioning cavity (13), and the other end of the elastic member (54) in the elastic direction is connected to the surface of the limiting piston (52). The elastic member (54) has a tendency to drive the limiting piston (52) to slide in a direction away from the limiting cavity (411) by elastic force. The surface of the limiting strip (44) facing the box body (1) is provided with a limiting groove (441) for the end of the limiting piston (52) to be embedded. When the limiting strip (44) moves along the inner wall of the sliding groove (413) toward the away cavity, the limiting groove (441) is provided. When sliding in the direction away from the limiting cavity (411), the end face of the limiting strip (44) abuts against the surface of the slider (51) and drives the slider (51) to slide in the direction away from the positioning cavity (13), the sealing effect of the slider (51) on the positioning cavity (13) disappears, the sliding cavity (12) connects the positioning cavity (13) and the limiting groove (441), the elastic force of the second elastic member (54) drives the limiting piston (52) to slide in the direction close to the limiting groove (441), and the end of the limiting piston (52) is embedded in the limiting groove (441) to form a limit.

5. The prefabricated substation with leakage protection switch according to claim 4 is characterized in that: The limiting assembly (5) further comprises a positioning piston (55); a positioning groove (14) for the positioning piston (55) to slide is provided on the surface of the box body (1); the sliding direction of the positioning piston (55) and the sliding direction of the limiting strip (44) are parallel to each other; the positioning groove (14) is connected to the positioning cavity (13); when the limiting piston (52) slides along the inner wall of the positioning cavity (13) in a direction close to the limiting groove (441), the positioning piston (55) is driven to slide in a direction close to the positioning cavity (13), and the end of the positioning piston (55) protrudes from the surface of the box body (1).

6. The prefabricated substation with leakage protection switch according to claim 4, characterized in that: The limiting assembly (5) further comprises a heat dissipation impeller (56), the heat dissipation impeller (56) being rotatably connected to the inner wall of the installation cavity (11), the air outlet end of the heat dissipation impeller (56) facing the electrical component, an outlet air passage (15) being provided on the inner wall of the installation cavity (11) facing the blades of the heat dissipation impeller (56), the outlet air passage (15) being connected to the positioning cavity (13), a connecting air passage (521) being provided on the surface of the limiting piston (52) facing the outlet air passage (15), the connecting air passage (521) penetrating the surface of the limiting piston (52) in a direction close to the limiting groove (441), the limiting A through flow channel (442) is provided on the inner wall of the positioning groove (441) toward the connecting flow channel (521), and the through flow channel (442) is connected to the inner cavity of the insulating airbag (42). When the end of the limiting piston (52) is embedded in the positioning groove (441), the connecting flow channel (521) is connected to the outlet flow channel (15) and the through flow channel (442). The air in the insulating airbag (42) passes through the through flow channel (442) and the connecting flow channel (521) in sequence and impacts the blades of the heat dissipation impeller (56) from the outlet flow channel (15). The heat dissipation impeller (56) rotates and guides the air to impact the electrical components.

7. The prefabricated substation with leakage protection switch according to claim 6, characterized in that: The limit bar (44) is connected to an opening and closing assembly (6), and the opening and closing assembly (6) includes an opening and closing plate (61) and an elastic member (62). The inner wall of the limit groove (441) is provided with a rotation cavity (443) for the opening and closing plate (61) to rotate. One end of the elastic member (62) in the elastic force direction is connected to the inner wall of the rotation cavity (443), and the other end of the elastic member (62) in the elastic force direction is connected to the rotation axis of the opening and closing plate (61). The elastic member (62) has an elastic force. The opening and closing plate (61) is driven to rotate in a direction approaching the housing (1), and the surface of the opening and closing plate (61) abuts against the inner wall of the rotating chamber (443) and closes the limiting groove (441). When the end of the limiting piston (52) is embedded in the limiting groove (441), the end of the limiting piston (52) abuts against the surface of the opening and closing plate (61) and drives the opening and closing plate (61) to rotate in a direction away from the housing (1), and the closing effect of the opening and closing plate (61) on the limiting groove (441) disappears.

8. The prefabricated substation with leakage protection switch according to claim 3 is characterized in that: The housing (1) is connected to a cooling component (7), the cooling component (7) comprising a cooling impeller (71) and a starter strip (72), the cooling impeller (71) being rotatably connected to the inner wall of the mounting cavity (11), the rotation axis of the cooling impeller (71) and the axis of the heat dissipation impeller (56) being parallel to each other, the inner wall of the air supply passage (412) being provided with a starter strip (414) for the starter strip (72) to slide, the surface of the starter strip (72) facing the insulating air bag (42) being provided with an insulating flow channel (721), the surface of the mounting cavity (11) facing the blades of the cooling impeller (71) being provided with an inlet flow channel (16), the inlet flow channel (16) penetrating the outer wall of the housing (1), the surface of the protective seat (41) facing the inlet flow channel (16) being provided with a heat dissipation flow channel (415), the heat dissipation flow channel (416) The starter strip (72) is provided with a cooling channel (722) on its surface facing the heat dissipation channel (415); when the starter strip (72) slides in a direction close to the insulating airbag (42), the insulating channel (721) connects the inner cavity of the insulating airbag (42) and the air supply channel (412); when the starter strip (72) slides in a direction close to the cooling impeller (71), the cooling channel (722) connects the air supply channel (412) and the heat dissipation channel (415); the air pump (43) drives air to pass through the air supply channel (412), the cooling channel (722), and the heat dissipation channel (415) in sequence and impact the blades of the cooling impeller (71) from the air inlet channel (16); the cooling impeller (71) rotates and drives the air to impact the electrical components.

9. The prefabricated substation with leakage protection switch according to claim 8, characterized in that: The cooling component (7) further comprises a gear (74), a rack (73), a magnetic block (75), an electromagnet (76) and an elastic member (77); a protective cavity (416) for the gear (74) to rotate is provided on the surface of the protective seat (41); the starting cavity (414) is connected to the protective cavity (416); a tooth groove meshing with the gear (74) is provided on the surface of the starting bar (72); the rack (73) is slidably connected to the inner wall of the protective cavity (416); the rack (73 meshes with the gear (74); and the sliding direction of the rack (73) and the sliding direction of the starting bar (72) are parallel to each other; the electromagnet (76) is connected to the inner wall of the protective cavity (416); the electromagnet (76) is electrically connected to the leakage protector (21); the magnetic block (75) is connected to the rack ( 73) is directed toward the surface of the electromagnet (76). When the leakage protector (21) detects leakage of the electrical component, the electromagnet (76) is controlled to be energized, the electromagnet (76) and the magnetic block (75) repel each other with the same poles, drive the rack (73) to slide, the gear (74) rotates, and drives the starter bar (72) to slide in the direction close to the insulating airbag (42). One end of the elastic member (77) in the elastic force direction is connected to the inner wall of the protective cavity (416), and the other end of the elastic member (77) in the elastic force direction is connected to the surface of the rack (73). The elastic force of the elastic member (77) is smaller than the magnetic force of the electromagnet (76). The elastic member (77) has the tendency to drive the rack (73) to slide and drive the starter bar (72) to slide in the direction close to the cooling impeller (71).

10. The prefabricated substation with leakage protection switch according to claim 9, characterized in that: The cooling component (7) further comprises a limiting rod (78), the end of which is connected to the rotating shaft of the gear (74); the inner wall of the limiting cavity (411) facing the protective cavity (416) is provided with a fixing groove (417) for the end of the limiting rod (78) to be embedded; when the elastic force of the elastic member (77) drives the rack (73) to slide, the gear (74) rotates, driving the limiting rod (78) to rotate in a direction close to the fixing groove (417); the limiting rod The end of the limiting rod (78) is embedded in the fixed groove (417), the end of the limiting rod (78) abuts against the inner wall of the fixed groove (417) to form a limit, and limits the limiting bar (44) in the limiting cavity (411); when the electromagnet (76) and the magnetic block (75) repel each other with the same poles to drive the rack (73) to slide, the gear (74) rotates, driving the limiting rod (78) to rotate in a direction away from the fixed groove (417), and the end of the limiting rod (78) is separated from the fixed groove (417).

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