Photovoltaic inverter convenient for internal maintenance

Abstract

The present invention relates to the technical field of photovoltaic inverters, and specifically to a photovoltaic inverter that is convenient for internal maintenance, comprising a box body, a circuit board being arranged in the box body, a cover plate being movably mounted on the box body, and a terminal post being arranged at the bottom of the box body for connecting a photovoltaic network and a load; a plug board, the plug board being fixedly arranged on the cover plate, a slot for inserting the plug board being provided on the box body, and a positioning component for positioning the plug board being provided on the outer side of the terminal post; and a side plate, the side plate being fixedly arranged on one side of the cover plate, and a side groove being provided on the box body. In this photovoltaic inverter that is convenient for internal maintenance, a positioning component is provided on the outer side of the terminal post, and the positioning component is squeezed after wiring, thereby positioning the plug board, so that the cover plate cannot be opened when the terminal post is connected to electricity, thereby preventing workers from getting electric shock.

Description

Technical Field

[0001] The invention relates to the technical field of photovoltaic inverters, in particular to a photovoltaic inverter which is convenient for internal maintenance. Background Art

[0002] A photovoltaic inverter is a power electronic device whose main function is to convert the direct current generated by photovoltaic panels into alternating current. The photovoltaic inverter is the core component of the photovoltaic power generation system. It can not only convert direct current into alternating current, but also monitor and control the operation of the photovoltaic power generation system to ensure maximum power generation and the safety and stability of the system. Photovoltaic inverters can be divided into different types such as centralized inverters, distributed inverters and micro inverters. The core part is the inverter circuit, which is composed of semiconductor devices and can be adjusted according to the voltage frequency and phase of the power grid to achieve compatibility with the power grid.

[0003] When a photovoltaic inverter fails, it needs to be opened for internal maintenance, but the inverter cannot be opened directly. The first thing to pay attention to is to cut off the power, including disconnecting the connection between the inverter and the power grid, and disconnecting the DC side appliances. Wait five to ten minutes after the power is cut off before maintenance. This is because the capacitors inside the inverter still store high electrical energy and voltage after the power is cut off, and the DC interface of the inverter may still maintain a high storage voltage. Therefore, it is necessary to wait for the capacitor to discharge before operating. The five to ten minutes are also for the inverter to fully dissipate heat to avoid burns. For example, the heat sink of the power semiconductor of the photovoltaic inverter equipment often has a very high temperature for a period of time after the power is cut off. The above factors cause the existing maintenance process to require a period of waiting time, and if you are not careful, you will be injured by electricity or burns. For this reason, we propose a photovoltaic inverter that is easy to internally repair. Summary of the invention

[0004] In order to solve the above technical problems, the embodiment of the present application provides a photovoltaic inverter that is convenient for internal maintenance, including a box body, a circuit board is arranged in the box body, a cover plate is movably installed on the box body, and also includes:

[0005] A terminal, which is arranged at the bottom of the box and is used to connect the photovoltaic grid and the load;

[0006] The plugboard is fixedly arranged on the cover plate, the box body is provided with a slot for inserting the plugboard, and a positioning component for positioning the plugboard is arranged on the outer side of the terminal;

[0007] The side plate is fixedly arranged on one side of the cover plate, and a side groove is opened on the box body.

[0008] In some embodiments, the positioning assembly includes a movable ring that is slidably mounted on the outside of the terminal, a movable groove for the movable ring to move is provided at the bottom of the box body, a return spring is provided at the top of the movable ring, both ends of the return spring are respectively fixedly connected to the movable ring and the top of the movable groove, a positioning rod is also fixedly provided on the top of the movable ring, a positioning groove is provided on the plug plate, a through hole is provided at the bottom of the movable groove, and when the plug plate is inserted into the slot, the through hole is connected to the positioning groove.

[0009] In some embodiments, a locking assembly is provided in the box body, and the locking assembly can lock the side panel after it is inserted into the side groove. The locking assembly includes a mounting plate fixedly provided on the inner wall of the box body, a connecting spring is fixedly connected to the mounting plate, a locking plate is provided on the end of the connecting spring, a locking groove is provided on the side wall of the side panel for plugging with the locking plate, a magnetic plate is fixedly provided on the locking plate, and an electromagnet is provided on the mounting plate, which repels the magnetic plate when energized.

[0010] In some embodiments, a discharge component is provided on the cover plate, a conduction component is provided in the box body, the discharge component is electrically connected to the capacitor through the conduction component, a top plate is also fixedly provided on the cover plate, a slot for inserting the top plate is opened on the box body, a limiting component is provided in the top plate, the limiting component is transmission-connected to the discharge component, and can limit the top plate after the top plate is inserted into the slot.

[0011] In some embodiments, the discharge assembly includes a drive motor fixedly mounted on the cover plate, the output end of the drive motor is connected to a drive shaft, and fan blades are disposed on the outer side of the end of the drive shaft.

[0012] In some embodiments, the conductive component includes two conductive columns respectively arranged on the cover plate and the circuit main board, the conductive column located on the cover plate is electrically connected to the drive motor, the other conductive column is electrically connected to the capacitor, and a connecting disk is fixedly arranged at the bottom of the other conductive column, a supporting spring is arranged at the bottom of the connecting disk, and both ends of the supporting spring are fixedly connected to the connecting disk and the circuit main board respectively, a guide plate is fixedly connected to one side of the connecting disk, a guide rod penetrating the guide plate is arranged on the circuit main board, an air cylinder 1 is arranged on the other side of the connecting disk, a horizontal plate is movably arranged at the bottom of the box body, vertical rods are arranged on both sides of the bottom of the horizontal plate, the vertical rods movably penetrate the box body and extend into the slot, and an air cylinder 2 is also arranged at the bottom of the horizontal plate, and the air cylinder 1 and the air cylinder 2 are connected to each other through a hose.

[0013] In some embodiments, a movable groove is provided in the top plate, and the limit assembly includes a movable block movably arranged in the movable groove, a limit spring is provided on one side of the movable block located in the top plate, two ends of the limit spring are respectively fixedly connected to the movable block and the side wall of the movable groove, and the other side of the movable block is an inclined surface, and limit rods are slidably provided on both sides of the top plate, and a limit groove is provided in the box body for plugging and cooperating with the limit rod, a rotating rod is provided between the limit rod and the movable block, and two ends of the rotating rod are respectively rotatably connected to the limit rod and the movable block.

[0014] In some embodiments, a plurality of sleeves are fixedly disposed on the outside of the drive shaft, a rotation spring is fixedly disposed inside the sleeve, an extension rod is connected to the end of the rotation spring, the extension rod is slidably disposed in the sleeve, an arc plate is disposed at the end of the extension rod, a transmission rod is slidably disposed in the cover plate, the top end of the transmission rod abuts against the inclined surface of the moving block, and the bottom end of the transmission rod abuts against the arc plate.

[0015] In some embodiments, the entire arc plate is made of rubber material, the middle portion of the arc plate is hard rubber and the two sides are soft rubber.

[0016] In some embodiments, a placement plate is provided on the circuit main board, a fixing cylinder is fixedly provided on the placement plate, a piston rod is slidably provided in the fixing cylinder, a conductive bow is provided at the end of the piston rod, the conductive bow is located on the side of the conductive column, and the fixing cylinder is filled with mercury.

[0017] The present invention has at least the following beneficial effects:

[0018] This photovoltaic inverter, which is easy for internal maintenance, has a positioning component on the outside of the terminal. After wiring, the positioning component will be squeezed, thereby positioning the plug board, making it impossible to open the cover when the terminal is connected to power, thereby avoiding electric shock or burns to workers. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of the present invention;

[0020] Figure 2 For the present invention Figure 1 Another structural diagram;

[0021] Figure 3 For the present invention Figure 1 Schematic diagram of local structure;

[0022] Figure 4 This is a schematic diagram of the cover plate structure in Embodiment 1 of the present invention;

[0023] Figure 5 For the present invention Figure 3 Schematic diagram of partial cross-section structure;

[0024] Figure 6 This is a schematic diagram of the locking assembly structure of the present invention;

[0025] Figure 7 This is a schematic diagram of the overall structure of Embodiment 2 of the present invention;

[0026] Figure 8 This is a schematic diagram of the cover plate structure in Embodiment 2 of the present invention;

[0027] Fig. 9 For the present invention Figure 7 Schematic diagram of local structure;

[0028] Fig.10 For the present invention Fig. 9 Schematic diagram of partial cross-section structure;

[0029] Fig.11 It is a structural schematic diagram of the conducting component of the present invention;

[0030] Fig.12 It is a schematic diagram of the partial cross-sectional structure of the top of the box body of the present invention;

[0031] Fig.13 It is a structural schematic diagram of the discharge assembly of the present invention;

[0032] Fig.14 It is a schematic diagram of a partial cross-sectional structure of the sleeve of the present invention;

[0033] Fig.15 It is a schematic diagram of the structure of the limiting component of the present invention.

[0034] In the figure: 1-box; 2-cover; 3-positioning assembly; 31-movable ring; 32-movable groove; 33-reset spring; 34-positioning rod; 35-positioning groove; 4-locking assembly; 41-mounting plate; 42-connecting spring; 43-locking plate; 44-locking groove; 45-magnetic plate; 46-electromagnet; 5-discharge assembly; 51-drive motor; 52-drive shaft; 53-fan blade; 54-sleeve; 55-rotation spring; 56-extension rod; 57-arc plate; 58-transmission rod; 6-conduction assembly; 61-conduction Electric post; 62-connecting plate; 63-support spring; 64-guide plate; 65-guide rod; 66-gas cylinder one; 67-horizontal plate; 68-vertical rod; 69-gas cylinder two; 7-limiting assembly; 71-moving groove; 72-moving block; 73-limiting spring; 74-limiting rod; 75-limiting groove; 76-rotating rod; 8-terminal; 9-plug-in plate; 10-slot; 11-side plate; 12-side groove; 13-top plate; 14-notch; 15-placing plate; 16-fixing cylinder; 17-piston rod; 18-conductor bow. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] Embodiment 1:

[0037] See also Figure 1-6 The present invention provides a technical solution: a photovoltaic inverter that is easy to maintain internally, including a box body 1, a circuit board is arranged in the box body 1, a cover plate 2 is movably installed on the box body 1, and also includes a terminal 8 fixedly arranged at the bottom of the box body 1, the terminal 8 is used to connect photovoltaic and load, a plug board 9 is arranged on the cover plate 2, a slot 10 for inserting the plug board 9 is provided on the box body 1, a positioning component 3 for positioning the plug board 9 is provided on the outer side of the terminal post 8, a side plate 11 is fixedly arranged on one side of the cover plate 2, and a side groove 12 used in conjunction with the side plate 11 is provided on the box body 1.

[0038] The positioning assembly 3 includes an active ring 31 slidably sleeved on the outer side of the terminal 8, a movable groove 32 for the movable ring 31 to move is provided at the bottom of the box body 1, a return spring 33 is provided on the top of the movable ring 31, and the two ends of the return spring 33 are fixedly connected to the active ring 31 and the top of the movable groove 32 respectively, and a positioning rod 34 is fixedly provided on the top of the movable ring 31, a positioning groove 35 is provided on the plug board 9, and a through hole is provided at the bottom of the movable groove 32. When the plug board 9 is inserted into the slot 10, the through hole is connected with the positioning groove 35, so that the positioning rod 34 can be inserted into the positioning groove 35 on the plug board 9. When the terminal 8 is in the wiring state, the active ring 31 at the interface will be squeezed, and then the active ring 31 moves upward, driving the positioning rod 34 to plug into the positioning groove 35, so that the plug board 9 cannot be pulled out from the slot 10, and then the cover plate 2 is positioned, that is, when the terminal 8 is in the wiring state, the cover plate 2 cannot be opened.

[0039] A locking assembly 4 is provided in the box body 1. The locking assembly 4 can lock the side plate 11 after it is inserted into the side groove 12. The locking assembly 4 includes a mounting plate 41 fixedly arranged on the inner side wall of the box body 1. A connecting spring 42 is fixedly connected to the mounting plate 41. A locking plate 43 is arranged at the end of the connecting spring 42. A locking groove 44 is provided on the side wall of the side plate 11 to be plugged and matched with the locking plate 43. A magnetic plate 45 is fixedly arranged on the locking plate 43. An electromagnet 46 is arranged on the mounting plate 41. When the electromagnet 46 is energized, it repels the magnetic plate 45.

[0040] The electromagnet 46 is connected to the capacitor. When there is current in the capacitor, the electromagnet 46 is energized to repel the magnetic plate 45, thereby driving the magnetic plate 45 to move. The magnetic plate 45 drives the locking plate 43 to move and insert into the locking groove 44, locking the side plate 11 so that the cover plate 2 cannot be opened.

[0041] In summary, in this embodiment, first, when the terminal 8 is in the connection state, the movable ring 31 will drive the positioning rod 34 to position the plug board 9 so that the cover 2 cannot be opened. When a fault occurs, the staff will connect the terminal 8 to the photovoltaic grid and disconnect the load. At this time, the positioning rod 34 no longer limits the plug board 9, but there is still residual current in the capacitor at this time, so the electromagnet 46 is in the energized state and repels the magnetic plate 45, thereby driving the locking plate 43 to move and insert into the locking groove 44, locking the side plate 11, so that the cover 2 cannot be opened. Only when the capacitor is discharged, the electromagnet 46 is powered off. At this time, under the action of the connecting spring 42, the locking plate 43 is disengaged from the locking groove 44, and the cover 2 can be opened, avoiding the situation where workers are easily injured during maintenance.

[0042] Embodiment 2:

[0043] See also Figure 7-15 The present invention provides a technical solution: a photovoltaic inverter that is easy to maintain internally, including a box body 1, a circuit board is arranged in the box body 1, a cover plate 2 is movably installed on the box body 1, and also includes a terminal 8 fixedly arranged at the bottom of the box body 1, the terminal 8 is used to connect photovoltaic and load, a plug board 9 is arranged on the cover plate 2, a slot 10 for inserting the plug board 9 is provided on the box body 1, a positioning component 3 for positioning the plug board 9 is provided on the outer side of the terminal post 8, a side plate 11 is fixedly arranged on one side of the cover plate 2, and a side groove 12 used in conjunction with the side plate 11 is provided on the box body 1.

[0044] The positioning assembly 3 includes an active ring 31 slidably sleeved on the outer side of the terminal 8, a movable groove 32 for the movable ring 31 to move is provided at the bottom of the box body 1, a return spring 33 is provided on the top of the movable ring 31, and the two ends of the return spring 33 are fixedly connected to the active ring 31 and the top of the movable groove 32 respectively, and a positioning rod 34 is fixedly provided on the top of the movable ring 31, a positioning groove 35 is provided on the plug board 9, and a through hole is provided at the bottom of the movable groove 32. When the plug board 9 is inserted into the slot 10, the through hole is connected with the positioning groove 35, so that the positioning rod 34 can be inserted into the positioning groove 35 on the plug board 9. When the terminal 8 is in the wiring state, the active ring 31 at the interface will be squeezed, and then the active ring 31 moves upward, driving the positioning rod 34 to plug into the positioning groove 35, so that the plug board 9 cannot be pulled out from the slot 10, and then the cover plate 2 is positioned, that is, when the terminal 8 is in the wiring state, the cover plate 2 cannot be opened.

[0045] A discharge component 5 is provided on the cover plate 2, and a conduction component 6 is provided in the box body 1. The discharge component 5 is electrically connected to the capacitor through the conduction component 6. A top plate 13 is also fixedly provided on the cover plate 2. A slot 14 for inserting the top plate 13 is provided on the box body 1. A limiting component 7 is provided in the top plate 13. The limiting component 7 is transmission-connected to the discharge component 5, and can limit the top plate 13 after the top plate 13 is inserted into the slot 14.

[0046] The discharge assembly 5 includes a drive motor 51 fixedly mounted on the cover plate 2, the output end of the drive motor 51 is connected to a drive shaft 52, and a fan blade 53 is arranged on the outer side of the end of the drive shaft 52. When the drive motor 51 rotates, it drives the drive shaft 52 and the fan blade 53 to rotate, thereby accelerating the heat dissipation of the high-temperature part in the box body 1, and can also consume the electricity in the capacitor, helping the capacitor to discharge quickly, and reducing the recognized waiting time.

[0047] The conduction component 6 includes two conductive posts 61 respectively arranged on the cover plate 2 and the circuit main board, the conductive post 61 on the cover plate 2 is electrically connected to the drive motor 51, the other conductive post 61 is electrically connected to the capacitor, and a connecting plate 62 is fixedly arranged at the bottom of the other conductive post 61, a supporting spring 63 is arranged at the bottom of the connecting plate 62, and both ends of the supporting spring 63 are fixedly connected to the connecting plate 62 and the circuit main board respectively, a guide plate 64 is fixedly connected to one side of the connecting plate 62, a guide rod 65 penetrating the guide plate 64 is arranged on the circuit main board, an air cylinder 1 66 is arranged on the other side of the connecting plate 62, a horizontal plate 67 is movably arranged at the bottom of the box body 1, vertical rods 68 are arranged on both sides of the bottom of the horizontal plate 67, the vertical rods 68 movably penetrate the box body 1 and extend into the slot 10, and an air cylinder 2 69 is also arranged at the bottom of the horizontal plate 67, and the air cylinder 1 66 and the air cylinder 2 69 are connected to each other through a hose;

[0048] When the terminal 8 is in the connection state, the movable ring 31 is squeezed and moves upward, driving the positioning rod 34 to move. When the positioning rod 34 moves upward, it will support the vertical rod 68 and drive the vertical rod 68 and the horizontal plate 67 to move upward. When the horizontal plate 67 moves upward, it drives the gas cylinder 2 69 to expand, and then extracts the gas in the gas cylinder 1 66 through the hose, so that the gas cylinder 1 66 shrinks. When the gas cylinder 1 66 shrinks, it drives the connecting plate 62 to move, and the connecting plate 62 drives the conductive column 61 to move and separate from the other conductive column 61. At this time, the driving motor 51 is not energized, that is, when the terminal 8 is in the connection state, the driving motor 51 is not energized;

[0049] When the inverter fails, the terminal 8 is no longer connected to the photovoltaic grid and the load. At this time, the movable ring 31 is reset, and the positioning rod 34 no longer supports the vertical rod 68. Therefore, under the action of the support spring 63, the air cylinder 66 is reset, driving the two conductive columns 61 to contact, so that the drive motor 51 is energized to drive the fan blades 53 to rotate. On the one hand, the temperature of the capacitor and other parts with high temperature that can easily burn the workers can be cooled. On the other hand, the drive motor 51 can consume the residual power in the capacitor, thereby reducing the waiting time of the workers and cooling the high-temperature parts during the waiting time.

[0050] A moving groove 71 is provided in the top plate 13, and the limiting assembly 7 includes a moving block 72 movably arranged in the moving groove 71. A limiting spring 73 is provided on one side of the moving block 72 located in the top plate 13. The two ends of the limiting spring 73 are respectively fixedly connected to the moving block 72 and the side wall of the moving groove 71. The other side of the moving block 72 is an inclined surface. Limiting rods 74 are slidably provided on both sides of the top plate 13. A limiting groove 75 that is plugged and matched with the limiting rod 74 is provided in the box body 1. A rotating rod 76 is provided between the limiting rod 74 and the moving block 72. The two ends of the rotating rod 76 are respectively rotatably connected to the limiting rod 74 and the moving block 72.

[0051] When the moving block 72 moves toward the top plate 13, the moving block 72 drives the limiting rod 74 to move through the rotating rod 76, so that the limiting rod 74 extends out of both sides of the top plate 13 and plugs into the limiting groove 75, so that the top plate 13 is locked in the box body 1, and the cover plate 2 cannot be opened.

[0052] A plurality of sleeves 54 are fixedly arranged on the outside of the driving shaft 52, a rotating spring 55 is fixedly arranged inside the sleeve 54, an extension rod 56 is connected to the end of the rotating spring 55, the extension rod 56 is slidably arranged in the sleeve 54, an arc plate 57 is arranged at the end of the extension rod 56, a transmission rod 58 is slidably arranged in the cover plate 2, the top end of the transmission rod 58 abuts against the inclined surface of the moving block 72, and the bottom end of the transmission rod 58 abuts against the arc plate 57;

[0053] When the drive shaft 52 rotates, it will drive the sleeve 54 and the extension rod 56 to rotate. During rotation, due to the action of centrifugal force, the extension rod 56 extends from the sleeve 54, driving the arc plate 57 to extend, thereby causing the arc plate 57 to support the transmission rod 58 to move upward, and the transmission rod 58 drives the moving block 72 to move.

[0054] The arc plate 57 is made of rubber as a whole, the middle part of the arc plate 57 is hard rubber and the two sides are soft rubber. When rotating, the soft rubber on both sides can be extended to a certain extent, thereby better contacting with the transmission rod 58 to ensure the stability of the transmission rod 58.

[0055] A placement plate 15 is provided on the circuit main board, and a fixing cylinder 16 is fixedly provided on the placement plate 15. A piston rod 17 is slidably provided in the fixing cylinder 16. A conductive pantograph 18 is provided at the end of the piston rod 17. The conductive pantograph 18 is located on the side of the conductive column 61. The fixing cylinder 16 is filled with mercury. When the inverter is in normal use and the internal temperature is too high, the mercury in the fixing cylinder 16 expands and drives the piston rod 17 to move. The piston rod 17 drives the conductive pantograph 18 to move so that the two conductive columns 61 are connected through the conductive pantograph 18, thereby causing the drive motor 51 to drive the fan blades 53 to rotate to cool down the box body 1. The drive motor 51 will be energized only in two cases: one is when the terminal 8 is not in a wiring state, and the other is when the internal temperature of the inverter is too high during normal use.

[0056] In summary, when the inverter is in normal use, the cover plate 2 is installed on the box body 1. When the inverter fails, the cover plate 2 needs to be opened for maintenance. However, normally it is necessary to wait for a period of time after the terminal 8 is disconnected from the photovoltaic grid and the load before safe operation. Therefore, in this embodiment, when the inverter fails, the terminal 8 is no longer connected to the photovoltaic grid and the load. At this time, the movable ring 31 is reset, and the positioning rod 34 no longer supports the vertical rod 68. Therefore, under the action of the support spring 63, the air cylinder 66 is reset, driving the two conductive columns 61 to contact, so that the drive motor 51 is energized to drive the fan blades 53 to rotate. On the one hand, the parts with high temperature such as capacitors that are easy to burn workers can be cooled. On the other hand, the residual electricity in the capacitor can be consumed by the drive motor 51, thereby reducing the waiting time of the workers and cooling the high-temperature parts during the waiting time.

[0057] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A photovoltaic inverter that is convenient for internal maintenance, comprising a box (1), a circuit board is arranged inside the box (1), a cover plate (2) is movably mounted on the box (1), and is characterized in that: Also included are: A terminal (8), the terminal (8) being arranged at the bottom of the box (1) and used for connecting the photovoltaic grid and the load; A plug board (9), the plug board (9) is fixedly arranged on the cover plate (2), the box body (1) is provided with a slot (10) for inserting the plug board (9), and a positioning component (3) for positioning the plug board (9) is arranged on the outer side of the terminal (8); A side plate (11), wherein the side plate (11) is fixedly arranged on one side of the cover plate (2), and a side groove (12) is opened on the box body (1); The positioning assembly (3) comprises a movable ring (31) slidably sleeved on the outer side of the terminal (8); a movable groove (32) for the movable ring (31) to move is provided at the bottom of the box body (1); a return spring (33) is provided at the top of the movable ring (31); two ends of the return spring (33) are respectively fixedly connected to the movable ring (31) and the top of the movable groove (32); a positioning rod (34) is also fixedly provided at the top of the movable ring (31); a positioning groove (35) is provided on the plug plate (9); a through hole is provided at the bottom of the movable groove (32); when the plug plate (9) is inserted into the slot (10), the through hole is connected to the positioning groove (35).

2. The photovoltaic inverter for facilitating internal maintenance according to claim 1, characterized in that: A locking assembly (4) is arranged in the box body (1), and the locking assembly (4) can lock the side plate (11) after the side plate (11) is inserted into the side groove (12). The locking assembly (4) comprises a mounting plate (41) fixedly arranged on the inner wall of the box body (1), a connecting spring (42) is fixedly connected to the mounting plate (41), a locking plate (43) is arranged at the end of the connecting spring (42), a locking groove (44) plug-matched with the locking plate (43) is opened on the side wall of the side plate (11), a magnetic plate (45) is fixedly arranged on the locking plate (43), and an electromagnet (46) is arranged on the mounting plate (41), and when the electromagnet (46) is energized, it repels the magnetic plate (45).

3. The photovoltaic inverter for facilitating internal maintenance according to claim 1, characterized in that: The cover plate (2) is provided with a discharge component (5), the box body (1) is provided with a conduction component (6), the discharge component (5) is electrically connected to the capacitor via the conduction component (6), the cover plate (2) is also fixedly provided with a top plate (13), the box body (1) is provided with a slot (14) for the top plate (13) to be inserted, a limiter component (7) is provided in the top plate (13), the limiter component (7) is transmission-connected to the discharge component (5), and can limit the top plate (13) after the top plate (13) is inserted into the slot (14).

4. The photovoltaic inverter for facilitating internal maintenance according to claim 3, characterized in that: The discharge assembly (5) comprises a drive motor (51) fixedly arranged on the cover plate (2); the output end of the drive motor (51) is connected to a drive shaft (52); and a fan blade (53) is arranged on the outer side of the end of the drive shaft (52).

5. The photovoltaic inverter for facilitating internal maintenance according to claim 4, characterized in that: The conduction component (6) comprises two conductive posts (61) respectively arranged on the cover plate (2) and the circuit main board, wherein the conductive post (61) on the cover plate (2) is electrically connected to the drive motor (51), and the other conductive post (61) is electrically connected to the capacitor, and a connection plate (62) is fixedly arranged at the bottom of the other conductive post (61), and a support spring (63) is arranged at the bottom of the connection plate (62), and two ends of the support spring (63) are respectively fixedly connected to the connection plate (62) and the circuit main board, and one side of the connection plate (62) is fixedly connected to the circuit main board. A guide plate (64) is fixedly connected, a guide rod (65) penetrating the guide plate (64) is arranged on the circuit main board, a gas cylinder (66) is arranged on the other side of the connecting plate (62), a horizontal plate (67) is movably arranged at the bottom of the box body (1), vertical rods (68) are arranged on both sides of the bottom of the horizontal plate (67), the vertical rods (68) movably penetrate the box body (1) and extend into the slot (10), a gas cylinder (69) is also arranged at the bottom of the horizontal plate (67), and the gas cylinder (66) and the gas cylinder (69) are connected to each other through a hose.

6. The photovoltaic inverter for facilitating internal maintenance according to claim 5, characterized in that: A movable groove (71) is provided in the top plate (13), and the limiting assembly (7) comprises a movable block (72) movably arranged in the movable groove (71); a limiting spring (73) is provided on one side of the movable block (72) located in the top plate (13); two ends of the limiting spring (73) are respectively fixedly connected to the movable block (72) and the side wall of the movable groove (71); the other side of the movable block (72) is an inclined surface; limiting rods (74) are slidably provided on both sides of the top plate (13); a limiting groove (75) pluggably engaged with the limiting rod (74) is provided in the box body (1); a rotating rod (76) is provided between the limiting rod (74) and the movable block (72); and two ends of the rotating rod (76) are respectively rotatably connected to the limiting rod (74) and the movable block (72).

7. The photovoltaic inverter for facilitating internal maintenance according to claim 6, characterized in that: A plurality of sleeves (54) are fixedly arranged on the outside of the driving shaft (52), a rotating spring (55) is fixedly arranged inside the sleeve (54), an end of the rotating spring (55) is connected to an extension rod (56), the extension rod (56) is slidably arranged in the sleeve (54), an arc plate (57) is arranged at the end of the extension rod (56), a transmission rod (58) is slidably arranged in the cover plate (2), the top end of the transmission rod (58) abuts against the inclined surface of the moving block (72), and the bottom end of the transmission rod (58) abuts against the arc plate (57).

8. The photovoltaic inverter for facilitating internal maintenance according to claim 7, characterized in that: The arc plate (57) is made entirely of rubber material, the middle portion of the arc plate (57) is made of hard rubber and the two sides are made of soft rubber.

9. The photovoltaic inverter for facilitating internal maintenance according to claim 8, characterized in that: A placement plate (15) is arranged on the circuit main board, a fixing cylinder (16) is fixedly arranged on the placement plate (15), a piston rod (17) is slidably arranged in the fixing cylinder (16), a conductive pantograph (18) is arranged at the end of the piston rod (17), the conductive pantograph (18) is located on the side of the conductive column (61), and the fixing cylinder (16) is filled with mercury.

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