Self-protection type photovoltaic inverter

Abstract

The invention relates to the technical field of photovoltaic power generation, in particular to a photovoltaic inverter with a self-protection function, which comprises a support bottom plate and a notch support plate fixedly connected onto the support bottom plate, an inverter main body is fixedly connected onto the notch support plate, and an input end shaft and an output end shaft are fixedly connected onto the inverter main body. Rotating vertical shafts are rotationally connected to the four corners of the supporting bottom plate correspondingly, protection rotating doors are fixedly connected to the four rotating vertical shafts correspondingly, the four rotating vertical shafts communicate with the four protection rotating doors correspondingly, a plurality of separation partition plates are fixedly connected into the four protection rotating doors in a staggered mode correspondingly, and ventilation strip holes are formed in the multiple sets of separation partition plates correspondingly; the ventilation strip holes all penetrate through the four protection rotating doors, the supporting bottom plate is fixedly connected with an inclined face fixing plate, and the inclined face fixing plate is evenly and fixedly connected with a plurality of cooling fans. The beneficial effects are that the inverter can be cooled according to the use condition of the inverter, the purpose of self-protection is achieved, and the inverter can work at normal temperature.

Description

Technical Field

[0001] The present invention relates to the technical field of photovoltaic power generation, and particularly relates to a photovoltaic inverter with a self-protection function. Background Art

[0002] A photovoltaic inverter can convert the variable DC voltage generated by a photovoltaic solar panel into AC power with the frequency of the commercial power grid, which can be fed back into the commercial power transmission system or used for an off-grid power grid. A photovoltaic inverter is one of the important system balances in a photovoltaic array system and can be used in conjunction with equipment powered by general AC power. A solar inverter has special functions in cooperation with a photovoltaic array, such as maximum power point tracking and anti-islanding protection functions.

[0003] As the core device of a photovoltaic power generation system, a photovoltaic inverter undertakes the key function of converting the DC power generated by solar panels into AC power. Its performance directly affects the power generation efficiency, power quality, and operation stability of the entire photovoltaic system. With the rapid growth of photovoltaic installed capacity, the reliability problem of inverters has become increasingly prominent.

[0004] However, existing photovoltaic inverters do not have self-regulating and self-protecting functions. Therefore, it is particularly important to design a photovoltaic inverter with a self-protection function. Summary of the Invention

[0005] One technical problem to be solved by this application is to achieve heat dissipation treatment of the inverter according to the usage situation of the inverter, so as to achieve the purpose of self-protection and ensure that the inverter can operate at a normal temperature.

[0006] To solve the above technical problem, an embodiment of this application provides a self-protection type photovoltaic inverter, which includes a support bottom plate and a notched support plate fixedly connected to the support bottom plate. An inverter main body is fixedly connected to the notched support plate. An input end shaft and an output end shaft are fixedly connected to the inverter main body. Rotating vertical shafts are rotatably connected to the four corners of the support bottom plate. Protection rotating doors are fixedly connected to the four rotating vertical shafts, and the four rotating vertical shafts are respectively communicated with the four protection rotating doors.

[0007] In some embodiments, a plurality of separation partitions are fixedly connected in a staggered manner inside the four protection rotating doors. Ventilation strip holes are provided on multiple groups of the plurality of separation partitions, and the plurality of ventilation strip holes all penetrate through the four protection rotating doors.

[0008] In some embodiments, an inclined fixing plate is fixedly connected to the support bottom plate, and a plurality of heat dissipation fans are uniformly fixedly connected to the inclined fixing plate.

[0009] In some embodiments, a storage cavity is slidably connected below the support bottom plate.

[0010] In some embodiments, drive gears are fixedly connected below the four rotating vertical shafts.

[0011] In some embodiments, a cross-shaped support plate is fixedly connected to the support bottom plate, a reduction motor is fixedly connected to the cross-shaped support plate, a main rotating gear is fixedly connected to the output shaft of the reduction motor, and the main rotating gear is in meshing transmission connection with the four drive gears.

[0012] In some embodiments, support columns are fixedly connected to the four corners of the support bottom plate, a protection cavity is fixedly connected to the four support columns, the protection cavity is rotationally connected to the four rotating vertical shafts, an upper sealing support plate is slidably connected to the protection cavity, an intermediate sealing frame plate is fixedly connected to the protection cavity, and the intermediate sealing frame plate is rotationally connected to the four rotating vertical shafts.

[0013] In some embodiments, transfer pumps are fixedly connected to the four corners of the storage cavity, the liquid suction pipes of the four transfer pumps are fixedly connected to and communicate with the storage cavity, and the liquid discharge pipes of the four transfer pumps are fixedly connected to and communicate with the protection cavity.

[0014] In some embodiments, two support fixing arms are fixedly connected to the upper sealing support plate, the two support fixing arms are respectively fixedly connected to the input end shaft and the output end shaft, conversion guide columns are fixedly connected to the two support fixing arms, the two conversion guide columns are respectively located directly above the input end shaft and the output end shaft, a square sliding column is fixedly connected to the upper sealing support plate, a support sliding plate is slidably connected to the square sliding column, a spring is sleeved on the square sliding column and is located between the square sliding column and the support sliding plate, switch sliding columns are fixedly connected to both ends of the support sliding plate, the two switch sliding columns are respectively located between the input end shaft and the output end shaft and the two conversion guide columns and are in contact, a limiting square plate is fixedly connected to the front end of the square sliding column, the limiting square plate is in contact with the support sliding plate, a telescopic rod is fixedly connected to the support sliding plate, a contact cylinder is fixedly connected to the telescopic rod, and the contact cylinder is slidably connected to the limiting square plate and is in contact with the support sliding plate.

[0015] In some embodiments, a shielding cavity is slidably connected to the two conversion guide columns, and the shielding cavity is located on the upper sealing support plate.

[0016] The present invention has at least the following beneficial effects:

[0017] 1. Add the coolant to the four protective rotating doors through four rotating vertical shafts. The four protective rotating doors can be used to shield and protect the inverter body. There are gaps between the four protective rotating doors and the inverter body, which facilitates the heat dissipation of the inverter body. When the weather is clear, there is no sand and dust, and there is someone on duty, the four protective rotating doors can be rotated to make the four rotating vertical shafts rotate on the support bottom plate. At this time, the inverter body will be completely exposed, and it will have a better heat dissipation effect. When it is necessary to protect the inverter body, just rotate the four protective rotating doors to make the four protective rotating doors stick tightly together, and the protection of the inverter body can be completed, preventing small animals or sundries from entering the device.

[0018] 2. Multiple separation partitions are placed in a staggered form. The middle part of the rotating vertical shaft is designed as a solid, and the upper and lower ends are designed as hollow structures. Communication ports are provided at the hollow parts. The coolant can be added through the hollow part above the rotating vertical shaft and enter the protective rotating door through the upper communication port. Then, through the multiple staggered separation partitions, the coolant is evenly distributed in the protective rotating door, keeping the protective rotating door in a low-temperature state, thereby effectively assisting in the heat dissipation of the inverter body. Moreover, the wind can be transmitted into the device through multiple ventilation strip holes and act on the inverter body, further enhancing the heat dissipation effect. Filter plates are fixedly connected in multiple ventilation strip holes, and the filter plates play a protective role, preventing sundries from entering the device and ensuring the normal operation of the inverter body. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The following further elaborates on the present invention in detail with reference to the drawings and specific implementation methods.

[0020] Figure 1 is a schematic structural diagram of an overall self-protective photovoltaic inverter;

[0021] Figure 2 is a schematic structural diagram of a part of a self-protective photovoltaic inverter Figure 1 ;

[0022] Figure 3 is a schematic structural diagram of a part of a self-protective photovoltaic inverter Figure 2 ;

[0023] Figure 4 is a schematic structural diagram of an embodiment providing a fixed space for the inverter;

[0024] Figure 5 is a schematic structural diagram of an embodiment for exposing the inverter;

[0025] Figure 6 is a specific schematic structural diagram of an embodiment for protecting the inverter;

[0026] Figure 7It is a schematic cross-sectional structure diagram of a specific embodiment for protecting an inverter;

[0027] Figure 8 It is a schematic structural diagram of an embodiment for protecting the upper end of an inverter;

[0028] Figure 9 It is a specific schematic structural diagram of an embodiment for protecting the upper end of an inverter;

[0029] Figure 10 It is a schematic structural diagram of an embodiment for realizing the disconnection transmission of an inverter;

[0030] Figure 11 It is a schematic structural diagram of the other side of an embodiment for realizing the disconnection transmission of an inverter.

[0031] In the figure: support bottom plate 101, notch support plate 102, inverter main body 103, input end shaft 104, output end shaft 105, rotating vertical shaft 106, protection rotating door 107, separation partition 201, ventilation strip hole 202, inclined surface fixed plate 301, heat dissipation fan 302, storage cavity 401, transmission gear 501, cross support plate 601, reduction motor 602, main rotating gear 603, support cylinder 701, protection cavity 702, upper sealing support plate 703, intermediate sealing frame plate 704, transfer pump 801, supporting fixed arm 901, conversion guide column 902, square sliding column 903, supporting sliding plate 904, switch sliding column 905, limiting square plate 906, telescopic rod 907, contact cylinder 908, shielding cavity 909. Specific embodiments

[0032] 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.

[0033] Embodiment 1: Please refer to Figures 1-6 , the present invention provides a technical solution: a self-protecting photovoltaic inverter, including a support bottom plate 101 and a notch support plate 102 fixedly connected to the support bottom plate 101. An inverter main body 103 is fixedly connected to the notch support plate 102. An input end shaft 104 and an output end shaft 105 are fixedly connected to the inverter main body 103. Rotating vertical shafts 106 are rotatably connected to the four corners of the support bottom plate 101. Protection rotating doors 107 are fixedly connected to the four rotating vertical shafts 106, and the four rotating vertical shafts 106 are respectively communicated with the four protection rotating doors 107.

[0034] Further, the supporting bottom plate 101 plays a role of bearing and supporting, and can provide a fixed space for the notch supporting plate 102. There is a notch on the notch supporting plate 102, and the notch supporting plate 102 can provide a fixed space for the inverter main body 103. Since the notch on the notch supporting plate 102 is located directly below the inverter main body 103, it is convenient for the heat dissipation treatment of the inverter main body 103. The variable DC voltage generated by the solar panel is transmitted into the inverter main body 103 through the input end shaft 104, and then the variable DC voltage is converted into commercial power frequency alternating current and transmitted out through the output end shaft 105. The four rotating vertical shafts 106 can rotate on the supporting bottom plate 101, and the four rotating vertical shafts 106 can provide a fixed space for the four protective rotating doors 107.

[0035] Coolant is added into the four protective rotating doors 107 through the four rotating vertical shafts 106. The four protective rotating doors 107 can be used to shield and protect the inverter main body 103. Moreover, there are gaps between the four protective rotating doors 107 and the inverter main body 103, which is convenient for the heat dissipation treatment of the inverter main body 103. When the weather is sunny, without sand and dust, and there is someone on guard, the four protective rotating doors 107 can be rotated to make the four rotating vertical shafts 106 rotate on the supporting bottom plate 101. At this time, the inverter main body 103 will be completely exposed, and it will have a better heat dissipation effect. When the inverter main body 103 needs to be protected, only need to rotate the four protective rotating doors 107 to make the four protective rotating doors 107 stick tightly together, then the protection treatment of the inverter main body 103 can be completed, and small animals or sundries can be prevented from entering the device.

[0036] Embodiment 2: Please refer to Figure 1 、 2 Figures 6 and 7. The present invention provides a technical solution: a self-protective photovoltaic inverter. A plurality of separating partitions 201 are fixedly connected in a staggered manner in each of the four protective rotating doors 107. Ventilation strip holes 202 are provided on multiple groups of the plurality of separating partitions 201, and the plurality of ventilation strip holes 202 all penetrate through the four protective rotating doors 107.

[0037] Further, a plurality of separation partitions 201 are placed in a staggered form. The middle end of the rotating vertical shaft 106 is solidly designed, and the upper and lower ends are hollow-structured. Communication ports are provided at the hollow parts. The coolant can be added through the hollow part above the rotating vertical shaft 106, enter the protective revolving door 107 through the upper communication port, and be evenly distributed in the protective revolving door 107 through the staggered plurality of separation partitions 201, keeping the protective revolving door 107 in a low-temperature state, thereby effectively assisting in heat dissipation of the inverter main body 103. Moreover, the wind can be transmitted into the device through a plurality of ventilation strip holes 202 and act on the inverter main body 103, further enhancing the heat dissipation effect. Filter plates are fixedly connected in the plurality of ventilation strip holes 202, and the filter plates play a protective role, preventing sundries from entering the device and ensuring the normal operation of the inverter main body 103.

[0038] Embodiment 3: Please refer to Figures 1-4 , the present invention provides a technical solution: a self-protective photovoltaic inverter, on which a sloped fixed plate 301 is fixedly connected to the support bottom plate 101, and a plurality of heat dissipation fans 302 are evenly and fixedly connected to the sloped fixed plate 301.

[0039] Further, the sloped fixed plate 301 can provide a fixed space for the plurality of heat dissipation fans 302. After starting the plurality of heat dissipation fans 302, an oblique wind will be generated and act on the bottom of the inverter main body 103, and through reflection, flow into the device, keeping the inverter main body 103 in a low-temperature state at all times and ensuring the normal operation of the inverter main body 103.

[0040] Embodiment 4: Please refer to Figures 1-4 , the present invention provides a technical solution: a self-protective photovoltaic inverter, a storage cavity 401 is slidably connected below the support bottom plate 101.

[0041] Further, the storage cavity 401 plays a role of bearing and support, realizing the stable placement of the device on the ground. The storage cavity 401 also stores cold zone liquid. After transferring the coolant in the storage cavity 401 to the upper parts of the four rotating vertical shafts 106, the coolant will enter the four protective revolving doors 107 and finally flow back to the storage cavity 401 through the four rotating vertical shafts 106, realizing the recycling of the coolant.

[0042] Embodiment 5: Please refer to Figures 1-5 , the present invention provides a technical solution: a self-protective photovoltaic inverter, a transmission gear 501 is fixedly connected below the four rotating vertical shafts 106.

[0043] Furthermore, the four transmission gears 501 can drive the four rotating vertical shafts 106 to rotate, thereby changing the angles of the four protective rotating doors 107, thereby achieving the protection of the inverter body 103 and the complete heat dissipation switching at any time.

[0044] Example 6: Please refer to Figures 1-5 The present invention provides a technical solution: a self-protection photovoltaic inverter, wherein a cross support plate 601 is fixedly connected to the support base plate 101, a reduction motor 602 is fixedly connected to the cross support plate 601, a main gear 603 is fixedly connected to the output shaft of the reduction motor 602, and the main gear 603 is meshed and transmission-connected with four transmission gears 501.

[0045] Furthermore, the cross support plate 601 can provide a fixed space for the reduction motor 602. After starting the reduction motor 602, it can drive the main gear 603 to rotate, and the rotating main gear 603 will simultaneously drive the four transmission gears 501 to rotate, thereby realizing the simultaneous opening and closing of the four protective rotating doors 107, and realizing the protection of the inverter body 103 and the complete heat dissipation switching at any time.

[0046] Example 7: Please refer to Figure 1 , 2 And 8-11, the present invention provides a technical solution: a self-protection photovoltaic inverter, the four corners of the supporting base plate 101 are fixedly connected with supporting cylinders 701, the four supporting cylinders 701 are fixedly connected with protective cavities 702, the protective cavities 702 are rotatably connected to four rotating vertical shafts 106, the protective cavity 702 is slidably connected with an upper sealing support plate 703, the protective cavity 702 is fixedly connected with an intermediate sealing frame plate 704, and the intermediate sealing frame plate 704 is rotatably connected to the four rotating vertical shafts 106.

[0047] Furthermore, the four supporting cylinders 701 play a supporting and fixing role, and can provide a fixed space for the protection cavity 702, and the protection cavity 702 can realize the protection treatment of the upper end of the inverter body 103, and the protection cavity 702 can store cooling liquid, and the cooling liquid in the protection cavity 702 can directly flow into the four rotating vertical shafts 106, and the upper sealing support plate 703 can realize the shielding treatment of the upper opening of the protection cavity 702 to prevent debris from entering the protection cavity 702. The input end shaft 104 and the output end shaft 105 pass through the protection cavity 702 and the upper sealing support plate 703 respectively, and the intermediate sealing frame plate 704 can change the large gap between the protection cavity 702 and the four protection revolving doors 107 into a small gap, which prevents debris from entering the device and will not affect the heat dissipation.

[0048] Example 8: Please refer to Figures 1-4, the present invention provides a technical solution: a self-protective photovoltaic inverter. At the four corners of the storage cavity 401, transfer pumps 801 are fixedly connected. The liquid suction pipes of the four transfer pumps 801 are fixedly connected to and communicate with the storage cavity 401, and the liquid discharge pipes of the four transfer pumps 801 are fixedly connected to and communicate with the protection cavity 702.

[0049] Further, after starting the four transfer pumps 801, the coolant in the storage cavity 401 can be pumped out and transferred to the protection cavity 702. The coolant entering the protection cavity 702 will directly flow into the four rotating vertical shafts 106, realizing the circulation of the coolant in the four protection revolving doors 107, ensuring that the four protection revolving doors 107 are always in a low-temperature state, and ensuring the heat dissipation treatment of the inverter body 103.

[0050] Example 9: Please refer to Figure 1 and 8 -11, the present invention provides a technical solution: a self-protective photovoltaic inverter. Two supporting fixed arms 901 are fixedly connected to the upper sealing support plate 703. The two supporting fixed arms 901 are respectively fixedly connected to the input end shaft 104 and the output end shaft 105. Two conversion guide columns 902 are fixedly connected to the two supporting fixed arms 901. The two conversion guide columns 902 are respectively located directly above the input end shaft 104 and the output end shaft 105. A square sliding column 903 is fixedly connected to the upper sealing support plate 703. A supporting sliding plate 904 is slidably connected to the square sliding column 903. A spring is sleeved on the square sliding column 903, and the spring is located between the square sliding column 903 and the supporting sliding plate 904. Switch sliding columns 905 are fixedly connected to both ends of the supporting sliding plate 904. The two switch sliding columns 905 are respectively located between the input end shaft 104 and the output end shaft 105 and the two conversion guide columns 902 and are in contact. A limiting square plate 906 is fixedly connected to the front end of the square sliding column 903. The limiting square plate 906 is in contact with the supporting sliding plate 904. A telescopic rod 907 is fixedly connected to the supporting sliding plate 904. A contact cylinder 908 is fixedly connected to the telescopic rod 907. The contact cylinder 908 is slidably connected to the limiting square plate 906 and is in contact with the supporting sliding plate 904.

[0051] Further, the two supporting and fixing arms 901 can provide a fixed space for the two conversion guide columns 902. Moreover, the two supporting and fixing arms 901 are made of plastic and do not conduct electricity. The variable DC voltage can enter through one of the conversion guide columns 902 and discharge through the other conversion guide column 902, becoming AC power with the mains frequency. The square sliding column 903 can provide a sliding space for the supporting sliding plate 904, allowing the supporting sliding plate 904 to slide only back and forth. The supporting sliding plate 904 is made of non-conductive material, and the supporting sliding plate 904 can provide a fixed space for the two switch sliding columns 905. The two conversion guide columns 902 are connected to the input end shaft 104 and the output end shaft 105 by using the two switch sliding columns 905 to achieve voltage transmission. The supporting sliding plate 904 is limited by the limiting square plate 906. The elastic force generated by the spring acts on the supporting sliding plate 904. At this time, the supporting sliding plate 904 will contact the limiting square plate 906. At this time, the two switch sliding columns 905 will be connected to one of the conversion guide columns 902 and the input end shaft 104, and the other conversion guide column 902 will be connected to the output end shaft 105. When the inverter main body 103 is at a high temperature and cannot operate normally, the telescopic rod 907 will be activated. The telescopic rod 907 will drive the supporting sliding plate 904 to move through the contact cylinder 908, so that the two switch sliding columns 905 are separated from the input end shaft 104 and the output end shaft 105 and the two conversion guide columns 902. At this time, no voltage will be transmitted into the inverter main body 103, and the operation of the inverter main body 103 will stop, allowing the inverter main body 103 to cool down quickly. When the inverter main body 103 drops to an appropriate temperature, the telescopic rod 907 will retract, so that the two switch sliding columns 905 are respectively located at the input end shaft 104 and the output end shaft 105 and contact the two conversion guide columns 902 again, realizing the restart of the inverter main body 103.

[0052] Embodiment 10: Please refer to Figure 1 , 8 and 9. The present invention provides a technical solution: a self-protective photovoltaic inverter. A shielding cavity 909 is slidably connected to the two conversion guide columns 902, and the shielding cavity 909 is located on the upper sealing and supporting plate 703.

[0053] Further, the shielding cavity 909 plays a protective role, protecting the supporting and fixing arms 901, the conversion guide columns 902, the square sliding columns 903, the supporting sliding plates 904, the switch sliding columns 905, the limiting square plates 906, the telescopic rods 907 and the contact cylinders 908, preventing sundries from falling on them, ensuring the normal operation of the device, and the shielding cavity 909 is made of non-conductive material.

[0054] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention.

Claims

1. A self-protective photovoltaic inverter, characterized in that: The invention comprises a supporting base plate (101) and a notched support plate (102) fixedly connected to the supporting base plate (101); an inverter body (103) is fixedly connected to the notched support plate (102); an input end shaft (104) and an output end shaft (105) are fixedly connected to the inverter body (103); four corners of the supporting base plate (101) are rotatably connected to rotating vertical shafts (106); the four rotating vertical shafts (106) are fixedly connected to protective rotating doors (107); and the four rotating vertical shafts (106) are respectively connected to the four protective rotating doors (107).

2. The self-protective photovoltaic inverter according to claim 1, characterized in that: A plurality of separation partitions (201) are staggered and fixedly connected in the four protection revolving doors (107), and ventilation holes (202) are arranged on the plurality of groups of separation partitions (201), and the plurality of ventilation holes (202) pass through the four protection revolving doors (107).

3. The self-protective photovoltaic inverter according to claim 2, wherein: The supporting bottom plate (101) is fixedly connected to an inclined surface fixing plate (301), and a plurality of cooling fans (302) are evenly fixedly connected to the inclined surface fixing plate (301).

4. The self-protective photovoltaic inverter according to claim 3, wherein: A storage cavity (401) is slidably connected below the supporting bottom plate (101).

5. The self-protective photovoltaic inverter according to claim 4, wherein: A transmission gear (501) is fixedly connected below the four rotating vertical shafts (106).

6. The self-protective photovoltaic inverter according to claim 5, characterized in that: A cross support plate (601) is fixedly connected to the support base plate (101), a reduction motor (602) is fixedly connected to the cross support plate (601), a main rotating gear (603) is fixedly connected to the output shaft of the reduction motor (602), and the main rotating gear (603) is meshed and transmission-connected with four transmission gears (501).

7. The self-protective photovoltaic inverter according to claim 6, characterized in that: The four corners of the support bottom plate (101) are fixedly connected to support cylinders (701), the four support cylinders (701) are fixedly connected to protection cavities (702), the protection cavities (702) are rotatably connected to four rotating vertical shafts (106), an upper sealing support plate (703) is slidably connected to the protection cavity (702), an intermediate sealing frame plate (704) is fixedly connected to the protection cavity (702), and the intermediate sealing frame plate (704) is rotatably connected to the four rotating vertical shafts (106).

8. The self-protective photovoltaic inverter according to claim 7, characterized in that: The four corners of the storage cavity (401) are fixedly connected to a transfer pump (801), the liquid extraction pipes of the four transfer pumps (801) are fixedly connected and communicated with the storage cavity (401), and the liquid outlet pipes of the four transfer pumps (801) are fixedly connected and communicated with the protection cavity (702).

9. The self-protective photovoltaic inverter according to claim 8, characterized in that: Two supporting and fixing arms (901) are fixedly connected to the upper sealing and supporting plate (703). The two supporting and fixing arms (901) are respectively fixedly connected to the input end shaft (104) and the output end shaft (105). Two conversion guide columns (902) are fixedly connected to the two supporting and fixing arms (901). The two conversion guide columns (902) are respectively located directly above the input end shaft (104) and the output end shaft (105). A square sliding column (903) is fixedly connected to the upper sealing and supporting plate (703). A supporting sliding plate (904) is slidably connected to the square sliding column (903). A spring is sleeved on the square sliding column (903). The spring is located between the square sliding column (903) and the supporting sliding plate (904). Switch sliding columns (905) are fixedly connected to both ends of the supporting sliding plate (904). The two switch sliding columns (905) are respectively located between the input end shaft (104) and the output end shaft (105) and the two conversion guide columns (902) and are in contact. A limiting square plate (906) is fixedly connected to the front end of the square sliding column (903). The limiting square plate (906) is in contact with the supporting sliding plate (904). A telescopic rod (907) is fixedly connected to the supporting sliding plate (904). A contact cylinder (908) is fixedly connected to the telescopic rod (907). The contact cylinder (908) is slidably connected to the limiting square plate (906) and is in contact with the supporting sliding plate (904).

10. A self-protective photovoltaic inverter according to claim 9, characterized in that: A shielding cavity (909) is slidably connected to the two conversion guide columns (902). The shielding cavity (909) is located on the upper sealing and supporting plate (703).

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