Safety protection device of photovoltaic grid-connected box

Abstract

The invention discloses a safety protection device of a photovoltaic grid-connected box, and relates to the technical field of grid-connected box protection device production, the safety protection device comprises a protection structure, the protection structure is used for gas isolation protection in a box body, and through contact of a touch terminal and a detection terminal, detection of a protector switch and an air protection switch by a detection instrument can be realized. By means of liquid nitrogen gasification, heat can be quickly absorbed, the temperature of the internal space of the box body can be reduced, over-temperature protection can be conducted on components, meanwhile, nitrogen can isolate oxygen, burning loss of the internal components can be avoided, and the components on the circuit can be better protected. Through the integrated control box, the state of the internal circuit of the grid-connected box is detected, the operation state data of the internal circuit is transmitted, the closing recovery of the circuit is controlled, and the safety and intelligent monitoring of the circuit can be greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of production of grid-connected box protection devices, and specifically relates to a safety protection device for a photovoltaic grid-connected box. Background Art

[0002] The grid-connected box is a key device in the power system for connecting distributed power generation equipment to the public grid, mainly undertaking functions such as power transmission, protection, monitoring, and control to ensure the safe and stable coordinated operation of the power generation system and the grid. When the grid-connected box is operating, higher requirements need to be put forward for the safety performance of the grid-connected box;

[0003] In existing documents, for example, the grid-connected photovoltaic box with a protection device disclosed in the publication number CN218415469 includes a grid-connected photovoltaic box body and a box door installed outside the grid-connected photovoltaic box body. Guide sliding sleeves are fixed on both sides of the grid-connected photovoltaic box body, and guide sliding blocks are slidably installed in the guide sliding sleeves. The outer walls of the tops of the guide sliding blocks are all connected with protection sleeves through connecting rods. By arranging protection sleeves on the grid-connected photovoltaic box body, the protection sleeves can move downward, and the four corners at the top of the grid-connected photovoltaic box body are wrapped by the protection sleeves, avoiding the problem that the top of the protection sleeve is directly collided by the human body, causing certain bumps to the human body, improving the safety of the device. By arranging a movable positioning insertion rod inside the guide sliding block, the positioning insertion rod can quickly be inserted into the positioning insertion hole inside the guide sliding sleeve under the elastic force of the return spring, forming a movable limit effect on the guide sliding block, preventing the displacement of the protection sleeve during use, and improving the stability of the device during use;

[0004] Based on the retrieval of the above patent and the discovery of equipment in the prior art, it is found that when the grid-connected box is in use, when overvoltage or overcurrent occurs, after the circuit breaker is protected, the circuit cannot be reset and turned on in time through detection, affecting the operation safety of grid connection and the safety of power transmission. Moreover, when the circuit is in an overvoltage or overcurrent state, due to the increase in temperature inside the box, it is easy to catch fire and cause danger. Also, due to the electrical components being in a high-temperature state, the self-protection mechanism cannot perform timely circuit closing and reset operations. Summary of the Invention

[0005] The purpose of the present invention is to provide a safety protection device for a photovoltaic grid-connected box to solve the following technical problems: when overvoltage or overcurrent occurs, after the circuit breaker is protected, the circuit cannot be reset and turned on in time through detection, affecting the operation safety of grid connection and the safety of power transmission. Moreover, when the circuit is in an overvoltage or overcurrent state, due to the increase in temperature inside the box, it is easy to catch fire and cause danger. Also, due to the electrical components being in a high-temperature state, the self-protection mechanism cannot perform timely circuit closing and reset operations.

[0006] The purpose of the present invention can be achieved by the following technical solutions:

[0007] A safety protection device for a photovoltaic grid-connected box, including a box body, a box door is hingedly installed on the box body, two mounting plates are installed in parallel inside the box body, and a manual switch, a surge protector, a protector switch and an air protection switch are respectively assembled on the mounting plates. It also includes:

[0008] Among them, the protector switch and the air protection switch are installed in parallel, and a protection structure is assembled at the bottom of the box body. The protection structure includes a pressure-dividing gas storage tank, the pressure-dividing gas storage tank is located on the inner wall of the bottom of the box body, and a transfer tank body is fixedly connected to the top of the pressure-dividing gas storage tank;

[0009] A telescopic cylinder is installed at the nozzle position of the transfer tank body. An exhaust hole is opened on the telescopic cylinder. A telescopic rod is inserted into the telescopic cylinder. One end of the telescopic rod is fixed with an arc-shaped pressing plate, and a third spring is arranged between the arc-shaped pressing plate and the end face of the telescopic cylinder;

[0010] An airbag is connected to the transfer tank body. A sliding plate is arranged on the airbag. A positioning ring is arranged outside the transfer tank body. A fourth spring is arranged between the positioning ring and the sliding plate.

[0011] As a further solution of the present invention: a linkage structure is assembled on the inner wall of the bottom of the box body. The linkage structure acts on the switch push plates of the protector switch and the air protection switch. Among them, the lifting plates in the linkage structure are respectively located below the switch push plates of the protector switch and the air protection switch;

[0012] The linkage structure further includes a movable plate. The movable plate is arranged at the bottom of the box body. Two first limit rods are fixed to the bottom of the box body. A rod hole is opened on the movable plate. The top of the first limit rod penetrates into the rod hole of the movable plate. A first spring is sleeved on the bottom of the first limit rod. A dispensing structure is installed on the top side of the middle part of the movable plate. The curved surface of the arc-shaped pressing plate in the protection structure abuts against the side surface of the movable plate in the linkage structure.

[0013] As a further solution of the present invention: the dispensing structure includes a positioning plate. A sliding hole is vertically opened on the positioning plate. A limiting groove is arranged on the side of the sliding hole. A sliding rod is slidably arranged in the sliding hole. One end of the sliding rod is fixed with a limiting cap. The limiting cap is fitted and clamped in the limiting groove;

[0014] The other end of the sliding rod is fixed with a push plate. A limiting ring is sleeved in the middle of the sliding rod. The diameter of the limiting ring is larger than the width of the sliding hole. A second spring is arranged between the limiting ring and the push plate. A lifting plate is fixed to the top of the push plate.

[0015] As a further solution of the present invention: a lifting support is fixed on the inner wall of the bottom of the box body, a lifting cam is rotatably installed in the lifting support, a lifting motor is installed on one side of the lifting support, the lifting motor is used for driving the lifting cam, and the lifting cam is located directly below the movable plate.

[0016] As a further solution of the present invention: a support seat is arranged on the inner wall of the bottom of the box body, a detection terminal is fixed on the side of the support seat, and the detection terminal is respectively connected to the electrode terminals of the corresponding protector switch and the air protection switch. A touch terminal is fixed on one side of the movable plate. After the touch terminal moves downward, it contacts the detection terminal. A detection instrument is assembled inside the box body, and the detection instrument and the touch terminal are respectively connected by wires.

[0017] As a further solution of the present invention: a support plate is supported and installed on the inner wall of the bottom of the box body, a trigger is assembled on one side of the support plate, and the trigger and the sliding plate are on the same side of the support plate to ensure that the trigger is triggered by the extrusion of the sliding plate after the sliding plate moves.

[0018] As a further solution of the present invention: the protection structure further includes a main gas storage tank and a pump. The main gas storage tank and the pump are connected by a conduit. The pump is respectively connected to the pressure-dividing gas storage tank by a pipeline. An air inlet pipe is arranged on the main gas storage tank and is equipped with a valve. Through the subsequent liquid nitrogen replenishment, it can realize timely protection against tripping caused by subsequent overvoltage and overcurrent.

[0019] As a further solution of the present invention: a sealing component. A ventilation hole is opened on the bottom side wall of the box body. A sealing component is arranged on the inner wall of the bottom of the box body. The movable grille on the sealing component is slidably attached to the inner wall of the box body. The sealing component includes a limiting plate fixed on the inner wall of the box body. A positioning hole is arranged inside the limiting plate, and a positioning column is movably inserted into the positioning hole. The bottom end of the positioning column is connected to a connecting plate. A fifth spring is connected between the limiting plate and the connecting plate. The bottom side of the connecting plate is connected to a movable grille. The bottom side of the movable grille is connected to a connecting strip. The connecting strip is connected to the end of the movable plate. After tripping, the movable grille slides downward, which can make the air holes on the movable grille misaligned with the ventilation hole, realize the blocking of the ventilation hole, can realize a short-term relative closure of the space inside the box body, can make the liquid nitrogen vaporize and fill the internal space of the box body, and realize the protection of the circuit.

[0020] As a further solution of the present invention: An integrated control box is installed inside the box. The integrated control box includes a data acquisition module, a signal transceiver module, an instruction issuing module, a storage battery, and a data recording module. The data acquisition module is used for the acquisition of monitored data and the reception of sensing signals. The signal transceiver module is used for the signal exchange between the internal data information of the grid-connected box and the central control terminal. The instruction issuing module is used for the control of internal protection components. The storage battery is used for providing power. The data recording module is used for data recording;

[0021] The integrated control box is connected to the central control terminal through a signal. The integrated control box is used for the data acquisition of detection instruments, the signal acquisition of triggers, and the instruction control of the jacking motor and the pump. And the power supplies of the detection instrument, the trigger, the jacking motor, and the pump are provided by the storage battery of the integrated control box. By means of the integrated control box, the detection of the internal circuit state of the grid-connected box is realized, the data of the internal circuit operation state is transmitted, and the closing and restoration of the circuit are controlled, which can greatly improve the safety and intelligent monitoring of the circuit.

[0022] The beneficial effects of the present invention:

[0023] When cutting off the circuit, the switch push plates of the protector switch and the air protection switch swing downward emergently to cut off the circuit; through the contact of the touch terminal and the detection terminal, the detection instrument can detect the protector switch and the air protection switch, and can determine whether the protector switch and the air protection switch in the open circuit state are normal, providing a reference basis for the subsequent circuit closing operation; when the data detected by the detection instrument is normal, the switch push plates of the protector switch and the air protection switch can be pushed up and reset by the push-up plate to realize circuit closing; when the detected data is abnormal, a damage signal can be sent to the central control terminal through the integrated control box to replace and maintain the damaged components;

[0024] When the movable plate is pushed down, the liquid nitrogen inside the pressure-dividing gas storage tank and the transfer tank body can be quickly released to quickly fill the bottom space of the box; through the vaporization of liquid nitrogen, heat can be quickly absorbed, the temperature of the internal space of the box can be reduced, over-temperature protection of the components can be achieved, and at the same time, nitrogen can isolate oxygen, avoiding the burning of internal components and better protecting the components on the circuit;

[0025] When resetting the electric switch, the inside of the box can still be kept in an oxygen-free state, avoiding the damage of the internal circuit of the grid-connected box caused by the generation of secondary high-voltage current during the closing process, and improving the safety of closing;

[0026] By means of the integrated control box, the detection of the internal circuit state of the grid-connected box is realized, the data of the internal circuit operation state is transmitted, and the closing and restoration of the circuit are controlled, which can greatly improve the safety and intelligent monitoring of the circuit. Brief Description of the Drawings

[0027] The present invention will be further described below in conjunction with the accompanying drawings.

[0028] Figure 1 is a schematic perspective view of the overall three-dimensional structure of the present invention;

[0029] Figure 2 is a schematic perspective view of the overall internal front three-dimensional structure of the present invention;

[0030] Figure 3 is a schematic perspective view of the overall back front three-dimensional structure of the present invention;

[0031] Figure 4 is Figure 2 a schematic view of the structure of region C in

[0032] Figure 5 is a schematic front perspective view of the linkage structure;

[0033] Figure 6 is a schematic top view of the linkage structure;

[0034] Figure 7 is a schematic top view of the structure inside the box;

[0035] Figure 8 is Figure 7 a schematic view of the sectional structure along A-A in

[0036] Figure 9 is Figure 7 a schematic view of the sectional structure along B-B in

[0037] Figure 10 is a schematic view of the dispensing structure;

[0038] In the figure: 1, box body; 2, box door; 3, mounting plate; 4, manual brake; 5, surge protector; 6, protector switch; 7, air protection switch; 8, detection instrument; 9, integrated control box; 11, linkage structure; 12, protection structure; 13, sealing component; 14, support base; 15, ventilation hole; 16, detection terminal; 17, touch terminal; 111, dispensing structure; 112, lifting motor; 113, lifting cam; 114, lifting bracket; 115, first limiting rod; 116, first spring; 117, movable plate; 1111, lifting plate; 1112, second spring; 1113, sliding rod; 1114, push plate; 1115, limiting ring; 1116, limiting groove; 1117, positioning plate; 1118, limiting cap; 1119, sliding hole; 121, arc-shaped pressing plate; 122, third spring; 123, telescopic cylinder; 124, pressure-dividing gas storage tank; 125, telescopic rod; 126, exhaust hole; 127, intermediate tank body; 128, positioning ring; 129, fourth spring; 1210, sliding plate; 1211, airbag; 1212, trigger; 1213, support plate; 1214, main gas storage tank; 1215, pump; 131, movable grille; 132, limiting plate; 133, connecting bar; 134, positioning column; 135, fifth spring; 136, connecting plate. Detailed implementation manners

[0039] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0040] Please refer to Figure 1 - Figure 3 As shown in the figure, the present invention is a safety protection device for a photovoltaic grid-connected box, including a box body 1, a box door 2 is hingedly installed on the box body 1, two mounting plates 3 are installed in parallel on the inner bottom side of the box body 1, and a manual brake 4, a surge protector 5, a protector switch 6 and an air protection switch 7 are respectively assembled on the mounting plates 3. It further includes:

[0041] As Figure 5 , Figure 9 shown, among them, the protector switch 6 and the air protection switch 7 are installed in parallel, a protection structure 12 is assembled at the bottom of the box body 1, and the protection structure 12 includes a pressure-dividing gas storage tank 124. The pressure-dividing gas storage tank 124 is located on the inner bottom wall of the box body 1, and the top of the pressure-dividing gas storage tank 124 is fixedly connected to an intermediate tank body 127;

[0042] A telescopic cylinder 123 is installed at the nozzle position of the transfer tank body 127. An exhaust hole 126 is provided on the telescopic cylinder 123. A telescopic rod 125 is inserted into the telescopic cylinder 123. One end of the telescopic rod 125 is fixed with an arc-shaped pressing plate 121, and a third spring 122 is arranged between the arc-shaped pressing plate 121 and the end face of the telescopic cylinder 123;

[0043] An airbag 1211 is connected to the transfer tank body 127. A sliding plate 1210 is arranged on the airbag 1211. A positioning ring 128 is arranged on the outer side of the transfer tank body 127. A fourth spring 129 is arranged between the positioning ring 128 and the sliding plate 1210;

[0044] A support plate 1213 is supported and installed on the bottom inner wall of the box body 1. A trigger 1212 is assembled on one side of the support plate 1213. The trigger 1212 and the sliding plate 1210 are located on the same side of the support plate 1213.

[0045] As Figure 9 shown, the protection structure 12 further includes a main gas storage tank 1214 and a pump 1215. The main gas storage tank 1214 and the pump 1215 are connected through a conduit. The pump 1215 is respectively connected to the pressure-dividing gas storage tank 124 through pipelines. An air inlet pipe is arranged on the main gas storage tank 1214 and is equipped with a valve. The curved surface of the arc-shaped pressing plate 121 in the protection structure 12 abuts against the side surface of the movable plate 117 on the linkage structure 11;

[0046] In order to enhance the protection of overvoltage or overcurrent circuits, when an overvoltage or overcurrent circuit occurs, it is easy to generate sparks, which are likely to cause the burning of components. At the same time, a large amount of heat will be generated, resulting in the inability of the components to reset;

[0047] When the movable plate 117 is pushed down, after the arc-shaped pressing plate 121 slides downward with the movable plate 117, it loses the restraint force. Under the expansion action of the third spring 122, it can drive the telescopic rod 125 to slide, so that the exhaust hole 126 on the telescopic cylinder 123 is communicated with the transfer tank body 127. At this time, the liquid nitrogen inside the pressure-dividing gas storage tank 124 and the transfer tank body 127 can be quickly released and quickly fill the bottom space of the box body 1;

[0048] Through the vaporization of liquid nitrogen, it can quickly absorb heat, reduce the temperature of the internal space of the box body 1, and can provide over-temperature protection for the components. At the same time, nitrogen can isolate oxygen, avoid the burning of internal components, and better protect the components on the circuit;

[0049] After the movable plate 117 is reset, the extrusion restraint on the arc-shaped extrusion plate 121 can be realized again. The telescopic rod 125 can be pushed into the telescopic cylinder 123 to block the exhaust hole 126. At this time, the pump 1215 operates to refill the liquid nitrogen in the main gas storage tank 1214 into the partial pressure gas storage tank 124 again. As the partial pressure gas storage tank 124 and the transfer tank 127 are filled with liquid nitrogen, the sliding plate 1210 is gradually pushed out at this time, and the fourth spring 129 is gradually stretched. When the sliding plate 1210 presses against and touches the trigger 1212, a trigger signal is transmitted to the integrated control box 9, and the integrated control box 9 controls the pump 1215 to stop pumping operation, which can ensure that the liquid nitrogen in the partial pressure gas storage tank 124 and the transfer tank 127 is sufficient to cope with the circuit protection operation.

[0050] As Figure 1 and Figure 5 shown, a linkage structure 11 is assembled on the bottom inner wall of the box body 1. The linkage structure 11 acts on the switch push plates of the protector switch 6 and the air protection switch 7. Among them, the lifting plates 1111 in the linkage structure 11 are respectively located below the switch push plates of the protector switch 6 and the air protection switch 7;

[0051] The linkage structure 11 further includes a movable plate 117. The movable plate 117 is arranged at the bottom of the box body 1. Two first limit rods 115 are fixed at the bottom of the box body 1, and rod holes are formed in the movable plate 117. The top of the first limit rod 115 penetrates into the rod holes of the movable plate 117, and a first spring 116 is sleeved on the bottom of the first limit rod 115. A dispensing structure 111 is installed on the top side of the middle part of the movable plate 117;

[0052] As Figure 5 shown, a lifting support 114 is fixed on the bottom inner wall of the box body 1. A lifting cam 113 is rotatably installed in the lifting support 114. A lifting motor 112 is installed on one side of the lifting support 114 for driving the lifting cam 113, and the lifting cam 113 is located directly below the movable plate 117;

[0053] As Figure 1 、 Figure 5 、 Figure 6 shown, a support seat 14 is arranged on the bottom inner wall of the box body 1. A detection terminal 16 is fixed on the side of the support seat 14, and the detection terminal 16 is respectively connected to the electrode terminals of the corresponding protector switch 6 and air protection switch 7. A touch terminal 17 is fixed on one side of the movable plate 117. The touch terminal 17 contacts the detection terminal 16 after descending. A detection instrument 8 is assembled inside the box body 1, and the detection instrument 8 and the touch terminal 17 are respectively connected by wires;

[0054] During application, in order to ensure the safety of the grid-connected circuit in the grid-connected box, a manual switch 4, a surge protector 5, a protector switch 6, and an air protection switch 7 are assembled in the box body 1, which can emergently cut off the circuit in case of overvoltage and overcurrent. When cutting off the circuit, the switch push plates of the protector switch 6 and the air protection switch 7 swing downward emergently to cut off the circuit;

[0055] After the circuit is cut off, the switch push plate can squeeze the lifting plate 1111. With the cooperation of other components of the linkage structure 11, the movable plate 117 can be pressed down. After the movable plate 117 is pressed down, the touch terminal 17 on the movable plate 117 contacts and triggers the detection terminal 16 on the support seat 14. Since the detection terminal 16 is circuit-connected to the protector switch 6 and the air protection switch 7, by contacting the touch terminal 17 and the detection terminal 16, the detection instrument 8 can detect the protector switch 6 and the air protection switch 7, and can determine whether the protector switch 6 and the air protection switch 7 in the open circuit state are normal, providing a reference basis for the subsequent circuit closing operation;

[0056] When the detection data by the detection instrument 8 is normal, an instruction is issued through the integrated control box 9, which can make the jacking motor 112 operate, drive the jacking cam 113 to rotate, and push up the movable plate 117. With the cooperation of the deployment structure 111, the lifting plate 1111 can push up and reset the switch push plates of the protector switch 6 and the air protection switch 7 to realize circuit closing;

[0057] When the detection data is abnormal, a damage signal can be sent to the central control terminal through the integrated control box 9 to replace and maintain the damaged components.

[0058] As Figure 7 、 Figure 8 and Figure 10 shown, among them, the deployment structure 111 includes a positioning plate 1117. A sliding hole 1119 is vertically formed on the positioning plate 1117, and a limiting groove 1116 is arranged on the side of the sliding hole 1119. A sliding rod 1113 is slidably arranged in the sliding hole 1119. One end of the sliding rod 1113 is fixed with a limiting cap 1118, and the limiting cap 1118 is fitted and clamped in the limiting groove 1116;

[0059] The other end of the sliding rod 1113 is fixed with a push plate 1114. A limiting ring 1115 is sleeved in the middle of the sliding rod 1113, and the diameter of the limiting ring 1115 is larger than the width of the sliding hole 1119. A second spring 1112 is arranged between the limiting ring 1115 and the push plate 1114. The top of the push plate 1114 is fixed with a lifting plate 1111;

[0060] When used in combination, in order to ensure that the top of the lifting plate 1111 can better act on the switch push plate positions of the protector switch 6 and the air protection switch 7, during manual maintenance, by pressing the push plate 1114, the limit cap 1118 stuck in the limit groove 1116 is pushed out, and then the sliding rod 1113 moves downward along the sliding hole 1119, and the lifting plate 1111 can be slid down to facilitate manual operation and maintenance;

[0061] After maintenance, press the push plate 1114 to push up the pressed push plate 1114 to realize the upward push of the lifting plate 1111. After the lifting plate 1111 moves to the switch push plate positions of the protector switch 6 and the air protection switch 7, it is automatically released. Under the reverse expansion action of the second spring 1112, the limit cap 1118 is stuck into the limit groove 1116 to ensure the stable splicing position of the push plate 1114 and the positioning plate 1117, which is convenient for the swinging and pressing of the switch push plates of the protector switch 6 and the air protection switch 7 when the circuit is overvoltage or overcurrent.

[0062] As Figure 4 shown, ventilation holes 15 are opened on the bottom side wall of the box body 1, the sealing assembly 13 is installed on the bottom inner wall of the box body 1, and the movable grille 131 on the sealing assembly 13 is slidably attached to the inner wall of the box body 1. The sealing assembly 13 includes a limit plate 132 fixed on the inner wall of the box body 1. A positioning hole is provided inside the limit plate 132, and a positioning column 134 is movably inserted into the positioning hole. The bottom end of the positioning column 134 is connected with a connecting plate 136. A fifth spring 135 is connected between the limit plate 132 and the connecting plate 136. The bottom side of the movable grille 131 is connected with a connecting strip 133, and the connecting strip 133 is connected with the end of the movable plate 117;

[0063] In order to realize the protection of the circuit by releasing liquid nitrogen, it is necessary to urgently close the bottom space of the box body 1. When the movable plate 117 is pushed down, with the pulling cooperation of the connecting strip 133, at this time the fifth spring 135 is stretched, and the movable grille 131 slides downward, so that the air holes on the movable grille 131 are misaligned with the ventilation holes 15, realizing the blocking of the ventilation holes 15, and realizing the temporary relative closure of the space inside the box body 1, enabling the liquid nitrogen to vaporize and fill the internal space of the box body 1 to realize the protection of the circuit;

[0064] When the circuit is restored to the closed state, since the gas state inside the box body 1 is mostly nitrogen and it is not easy to generate sparks, it can be safer to operate when the circuit is restored, realizing multi-level protection of the circuit.

[0065] As Figure 1 、 Figure 5 、 Figure 9As shown in the figure, an integrated control box 9 is installed inside the box body 1. The integrated control box 9 includes a data acquisition module, a signal transceiver module, an instruction issuing module, a storage battery, and a data recording module. The data acquisition module is used for the acquisition of monitored data and the reception of sensing signals. The signal transceiver module is used for the signal exchange of the internal data information of the grid-connected box and the central control terminal. The instruction issuing module is used for the control of internal protection components. The storage battery is used to provide power. The data recording module is used for data recording. The integrated control box 9 is connected to the central control terminal through a signal. The integrated control box 9 is used for the data acquisition of the detection instrument 8. The integrated control box 9 is used for the signal acquisition of the trigger 1212. The integrated control box 9 is used for the instruction control of the lifting motor 112 and the pump 1215. And the power supplies of the detection instrument 8, the trigger 1212, the lifting motor 112, and the pump 1215 are provided by the storage battery of the integrated control box 9. Through the integrated control box 9, the detection of the internal circuit state of the grid-connected box is realized, the operation state data of the internal circuit is transmitted, and the closing and restoration of the circuit are controlled, which can greatly improve the safety and intelligent monitoring of the circuit.

[0066] Working principle: When cutting off the circuit, the switch push plates of the protector switch 6 and the air protection switch 7 swing downward urgently to cut off the circuit.

[0067] After the circuit is cut off, the switch push plate can squeeze the lifting plate 1111. With the cooperation of other components of the linkage structure 11, the movable plate 117 can be pressed down. The touch terminal 17 on the pressed-down movable plate 117 contacts the detection terminal 16 on the support seat 14 to trigger. Since the detection terminal 16 is circuit-connected to the protector switch 6 and the air protection switch 7, through the contact of the touch terminal 17 and the detection terminal 16, the detection instrument 8 can detect the protector switch 6 and the air protection switch 7, and it can be determined whether the protector switch 6 and the air protection switch 7 in the open circuit state are normal, providing a reference basis for the subsequent circuit closing operation.

[0068] When the data detected by the detection instrument 8 is normal, by issuing an instruction through the integrated control box 9, the lifting motor 112 can operate, driving the lifting cam 113 to rotate, realizing the lifting of the movable plate 117. With the cooperation of the deployment structure 111, the lifting plate 1111 can push up and reset the switch push plates of the protector switch 6 and the air protection switch 7 to realize circuit closing.

[0069] When the detected data is abnormal, a damage signal can be sent to the central control terminal through the integrated control box 9 to replace and maintain the damaged components.

[0070] In order to enhance the protection of overvoltage or overcurrent circuits, when an overvoltage or overcurrent circuit occurs, it is easy to generate sparks, which are likely to cause the burnout of components. At the same time, a large amount of heat will be generated, resulting in the inability of the components to reset.

[0071] When the movable plate 117 is pushed down, after the arc-shaped pressing plate 121 slides downward along with the movable plate 117, it loses the binding force. Under the expansion action of the third spring 122, it can drive the telescopic rod 125 to slide, so that the exhaust hole 126 on the telescopic cylinder 123 communicates with the transfer tank body 127. At this time, the liquid nitrogen inside the pressure-dividing gas storage tank 124 and the transfer tank body 127 can be quickly released and rapidly fill the bottom space of the box body 1.

[0072] Through the vaporization of liquid nitrogen, heat can be quickly absorbed, the temperature of the internal space of the box body 1 can be reduced, over-temperature protection of the components can be achieved. At the same time, nitrogen can isolate oxygen, avoid the burning of internal components, and better protect the components on the circuit.

[0073] When the electric switch is reset, the inside of the box body 1 can still remain in an oxygen-free state, avoiding damage to the internal circuit of the grid-connected box caused by secondary high-voltage current generated during the closing process, and improving the safety of closing.

[0074] By means of the integrated control box 9, the detection of the internal circuit state of the grid-connected box is realized, the operation state data of the internal circuit is transmitted, and the closing restoration of the circuit is controlled, which can greatly enhance the safety and intelligent monitoring of the circuit.

[0075] The above has described a specific embodiment of the present invention in detail, but the content is only the preferred embodiment of the present invention and cannot be considered as limiting the scope of implementation of the present invention. All equivalent changes and improvements made according to the scope of the present invention application shall still fall within the scope covered by the patent of the present invention.

Claims

1. A safety protection device for a photovoltaic grid-connected box, comprising a box body (1), wherein a box door (2) is hingedly mounted on the box body (1), two mounting plates (3) are mounted in parallel on the inner bottom side of the box body (1), and a manual gate (4), a surge protector (5), a protector switch (6) and an air protection switch (7) are respectively assembled on the mounting plates (3), characterized in that: Also includes: The protector switch (6) and the air protection switch (7) are installed in parallel, the bottom of the box (1) is equipped with a protection structure (12), the protection structure (12) comprises a pressure-dividing gas storage tank (124), the pressure-dividing gas storage tank (124) is located on the bottom inner wall of the box (1), and the top of the pressure-dividing gas storage tank (124) is fixedly connected to a transfer tank (127); A telescopic cylinder (123) is installed at the bottle mouth of the transfer tank (127), an exhaust hole (126) is provided on the telescopic cylinder (123), a telescopic rod (125) is inserted into the telescopic cylinder (123), an arc-shaped extrusion plate (121) is fixed to one end of the telescopic rod (125), and a third spring (122) is provided between the arc-shaped extrusion plate (121) and the end surface of the telescopic cylinder (123); The transfer tank body (127) is connected to an airbag (1211), a sliding plate (1210) is arranged on the airbag (1211), a positioning ring (128) is arranged on the outer side of the transfer tank body (127), and a fourth spring (129) is arranged between the positioning ring (128) and the sliding plate (1210).

2. A safety protection device for a photovoltaic grid-connected box according to claim 1, characterized in that: It also includes a linkage structure (11), wherein the linkage structure (11) is mounted on the inner wall of the bottom of the box body (1), and the linkage structure (11) acts on the switch push plates of the protector switch (6) and the air protection switch (7), wherein the push-up plates (1111) in the linkage structure (11) are respectively located below the switch push plates of the protector switch (6) and the air protection switch (7), and a protective structure (12) is arranged on one side of the linkage structure (11), and the curved surface of the arc-shaped extrusion plate (121) in the protective structure (12) abuts against the side surface of the movable plate (117) on the linkage structure (11); A vent hole (15) is provided on the bottom side wall of the box body (1), the sealing assembly (13) is mounted on the bottom inner wall of the box body (1), and the movable grille (131) on the sealing assembly (13) is slidably attached to the inner wall of the box body (1); The linkage structure (11) comprises a movable plate (117), wherein the movable plate (117) is arranged at the bottom of the box body (1), two first limiting rods (115) are fixed to the bottom of the box body (1), and a rod hole is opened on the movable plate (117), the top of the first limiting rod (115) passes through the rod hole of the movable plate (117), the bottom of the first limiting rod (115) is sleeved with a first spring (116), and the middle top side of the movable plate (117) is installed with a deployment structure (111).

3. A safety protection device for a photovoltaic grid-connected box according to claim 2, characterized in that: The deployment structure (111) comprises a positioning plate (1117), a sliding hole (1119) is provided on the positioning plate (1117) in the vertical direction, and a limiting groove (1116) is provided on the side of the sliding hole (1119), a sliding rod (1113) is slidably provided in the sliding hole (1119), a limiting cap (1118) is fixed at one end of the sliding rod (1113), and the limiting cap (1118) is matched and clamped in the limiting groove (1116); A push plate (1114) is fixed to the other end of the slide rod (1113), and a limit ring (1115) is sleeved on the middle part of the slide rod (1113), and the diameter of the limit ring (1115) is greater than the width of the slide hole (1119), a second spring (1112) is arranged between the limit ring (1115) and the push plate (1114), and a push-up plate (1111) is fixed to the top of the push plate (1114).

4. A safety protection device for a photovoltaic grid-connected box according to claim 1, characterized in that: A lifting bracket (114) is fixed on the inner wall of the bottom of the box body (1), a lifting cam (113) is rotatably mounted in the lifting bracket (114), a lifting motor (112) is mounted on one side of the lifting bracket (114), the lifting motor (112) is used to drive the lifting cam (113), and the lifting cam (113) is located directly below the movable plate (117).

5. A safety protection device for a photovoltaic grid-connected box according to claim 4, characterized in that: A support seat (14) is provided on the inner wall of the bottom of the box body (1), and a detection terminal (16) is fixed on the side of the support seat (14), and the detection terminal (16) is respectively connected to the electrode terminals of the corresponding protector switch (6) and the air protection switch (7). A touch terminal (17) is fixed on one side of the movable plate (117), and the touch terminal (17) contacts the detection terminal (16) after descending and moving. A detection instrument (8) is installed inside the box body (1), and the detection instrument (8) and the touch terminal (17) are respectively connected through wires.

6. A safety protection device for a photovoltaic grid-connected box according to claim 1, characterized in that: A support plate (1213) is supported and mounted on the inner wall of the bottom of the box body (1), a trigger (1212) is mounted on one side of the support plate (1213), and the trigger (1212) and the sliding plate (1210) are located on the same side of the support plate (1213).

7. A safety protection device for a photovoltaic grid-connected box according to claim 1, characterized in that: The protective structure (12) further comprises a main gas storage tank (1214) and a pump (1215), wherein the main gas storage tank (1214) and the pump (1215) are connected via a conduit, and the pump (1215) is respectively connected to the pressure-dividing gas storage tank (124) via a pipeline, and the main gas storage tank (1214) is provided with an air intake pipe and equipped with a valve.

8. A safety protection device for a photovoltaic grid-connected box according to claim 1, characterized in that: The bottom side wall of the box body (1) is provided with an air vent (15); the bottom inner wall of the box body (1) is provided with a sealing assembly (13); and a movable grille (131) on the sealing assembly (13) is slidably attached to the inner wall of the box body (1); the sealing assembly (13) comprises a limit plate (132); the limit plate (132) is fixed to the inner wall of the box body (1); a positioning hole is provided inside the limit plate (132); a positioning column (134) is movably inserted into the positioning hole; a connecting plate (136) is connected to the bottom end of the positioning column (134); a fifth spring (135) is connected between the limit plate (132) and the connecting plate (136); the bottom side of the connecting plate (136) is connected to the movable grille (131); the bottom side of the movable grille (131) is connected to a connecting strip (133); and the connecting strip (133) is connected to the end of the movable plate (117).

9. A safety protection device for a photovoltaic grid-connected box according to claim 1, characterized in that: An integrated control box (9) is installed in the box body (1), and the integrated control box (9) comprises a data acquisition module, a signal transceiver module, a command issuing module, a storage battery and a data recording module. The data acquisition module is used for collecting monitoring data and receiving sensor signals, the signal transceiver module is used for exchanging signals between internal data information of the grid-connected box and a central control terminal, the command issuing module is used for controlling internal protection components, the storage battery is used for providing power, and the data recording module is used for recording data.

10. A safety protection device for a photovoltaic grid-connected box according to claim 9, characterized in that: The integrated control box (9) is connected to the central control terminal via a signal, the integrated control box (9) is used for data collection of the detection instrument (8), the integrated control box (9) is used for signal collection of the trigger (1212), the integrated control box (9) is used for command control of the lifting motor (112) and the pump (1215), and the power supply of the detection instrument (8), the trigger (1212), the lifting motor (112), and the pump (1215) is provided by a storage battery of the integrated control box (9).

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