A miniaturized, highly integrated photovoltaic inverter

Abstract

This invention relates to the field of inverter technology and discloses a miniaturized, highly integrated photovoltaic inverter, comprising an inverter body, an outer shell, and a cover plate connected to the outer shell. An inner shell is slidably disposed inside the outer shell. A sealing ring for use with the inner shell is installed on the side of the cover plate. The outer shell and the cover plate together form a cavity. A housing is installed outside the outer shell, and an airbag is disposed inside the housing. A ventilation component is disposed between the airbag and the outer shell to control the gas flow between the cavity and the airbag. A sealing component is disposed between the inner shell and the housing to push the inner shell to press against the side of the sealing ring. At high temperatures, the air expanding in the cavity is discharged into the airbag through the ventilation component, and the outer shell and the cover plate expand due to heat, closing the gap. At low temperatures, the air contracting in the airbag is discharged into the cavity through the ventilation component, and the outer shell and the cover plate contract due to cold, widening the gap. However, the inner shell is pressed against the side of the sealing ring by the sealing component, ensuring airtightness.

Description

Technical Field

[0001] This invention relates to the field of inverter technology, and more specifically, to a miniaturized, highly integrated photovoltaic inverter. Background Technology

[0002] Miniaturized, highly integrated photovoltaic inverters are simply called microinverters. Microinverters are inverters in the photovoltaic power generation system of the solar energy industry with a power output of less than 1 kilowatt and the ability to track maximum power point at the module level. The inverter is connected to the solar panel through wires, and each photovoltaic module is equipped with an independent microinverter.

[0003] Microinverters typically operate at DC-side voltages below 48V, reducing the risk of electric shock. They feature overvoltage, overcurrent, and overheat protection to ensure stable system operation, thus offering high safety. Their small size and light weight allow for direct mounting on the back of modules or on brackets, saving space and cost, and facilitating installation. Hot-swappable expansion is supported, and faulty modules can be replaced individually, resulting in low maintenance costs and short maintenance times. The DC power generated by the photovoltaic modules is input to the microinverter via cables. A built-in MPPT module monitors voltage and current in real time, dynamically adjusting the operating point to maximize power output. The DC power is then converted to AC power after isolation by a high-frequency transformer, with voltage and frequency adjusted to match grid standards and ensure synchronization with the grid.

[0004] Currently, due to the strong solar radiation in desert regions, laying solar panels connected to inverters in the desert can improve solar power generation efficiency. However, due to severe wind and dust in the desert, fine sand can easily enter the inverter through gaps in the inverter casing and cover the electronic components inside, which can adversely affect the inverter's functionality. Therefore, there are stringent requirements for the airtightness of inverters used in the desert. Existing inverters need to minimize gaps in the inverter casing to ensure airtightness. However, the extreme temperature difference between day and night in desert regions, with nighttime temperatures reaching -30 to -40 degrees Celsius and daytime temperatures exceeding 40 degrees Celsius, can cause the inverter casing to deform due to thermal expansion and contraction, distorting the sealed gaps and affecting the inverter's airtightness. Therefore, this approach does not meet the current requirements. To address this issue, we propose a miniaturized, highly integrated photovoltaic inverter. Summary of the Invention

[0005] This invention provides a miniaturized, highly integrated photovoltaic inverter. When used in desert environments with extreme diurnal temperature variations, this miniaturized, highly integrated photovoltaic inverter minimizes the deformation of the inverter casing due to thermal expansion and contraction, which can easily affect the inverter's airtightness. This solves the problem mentioned in the background art where extreme diurnal temperature variations can easily cause the inverter casing to deform due to thermal expansion and contraction, resulting in distortion and deformation of the sealed casing gaps, thus easily affecting the inverter's airtightness.

[0006] To achieve the above objectives, this disclosure provides a miniaturized, highly integrated photovoltaic inverter, including an inverter body. The inverter body includes a housing and a cover plate connected to the housing. An inner shell is slidably disposed inside the housing. A sealing ring that cooperates with the inner shell is installed on the side of the cover plate. The housing and the cover plate together form a cavity. A box is installed on the outside of the housing. An airbag is disposed inside the box. A ventilation component is disposed between the airbag and the housing. The ventilation component is used to control the gas flow between the cavity and the airbag. A sealing component is disposed between the inner shell and the box. The sealing component is used to push the inner shell to press against the side of the sealing ring. At high temperatures, the air expanding in the cavity is discharged into the airbag through the ventilation component, and the housing and the cover plate expand due to heat, closing the gap. At low temperatures, the air contracting in the airbag is discharged into the cavity through the ventilation component, and the housing and the cover plate contract due to cold, widening the gap. However, the inner shell is pressed against the side of the sealing ring by the sealing component.

[0007] Optionally, the housing and the cover are connected by fasteners, the cavity is used to accommodate the electronic components of the inverter body, and the cavity contains air.

[0008] Optionally, a spring is provided inside the outer casing, and the number of springs is set to several. One end of the spring is connected to the inner wall of the outer casing, and the other end of the spring is connected to the inner shell. In the initial state, there is a gap between the outer casing and the cover plate, the inner shell abuts against the side of the sealing ring, and the spring is in a compressed state.

[0009] Optionally, the ventilation assembly includes a main air tube that is commonly inserted into the outer shell and the inner shell side, a corrugated tube connected to the middle of the main air tube, a first branch tube that communicates with the main air tube and is inserted into the side of the airbag, a first one-way valve connected to the first branch tube, a second branch tube that communicates with the main air tube and is inserted into the side of the airbag, and a second one-way valve connected to the second branch tube.

[0010] Optionally, the outlet of the first one-way valve is connected to the airbag, and the inlet of the second one-way valve is connected to the airbag.

[0011] Optionally, the ventilation assembly further includes a connecting rod connected to the inner wall of the airbag and a baffle connected to the connecting rod. The baffle alternately covers the ends of the first one-way valve and the second one-way valve, respectively. In the initial state, the baffle covers the end of the first one-way valve.

[0012] Optionally, the encryption component includes a cylinder installed on the inner wall of the box, a temperature-sensitive telescopic rod disposed on the inner side of the cylinder, a slide rod slidably inserted into the side of the cylinder and connected to the temperature-sensitive telescopic rod, and a first wedge block installed at the end of the slide rod.

[0013] Optionally, the slide bar is configured as an "L"-shaped bar, with the side of the slide bar connected to the outside of the airbag, and the first wedge block located on the lower side of the airbag.

[0014] Optionally, the encryption component further includes a second wedge block installed on the outer side of the inner shell, a third wedge block slidably disposed on the inner side of the outer shell and slidably engaged with the second wedge block, a straight rod slidably inserted between the outer shell and the housing and connected to the third wedge block, and a fourth wedge block installed at the end of the straight rod and intermittently engaged with the first wedge block.

[0015] Optionally, the side of the box is provided with an air hole, so that the inside of the box can communicate with the outside through the air hole. The sliding joint between the straight rod and the outer shell is sealed by conventional technical means, and the outer shell and the inner shell are also sealed by conventional technical means, so that the cavity remains sealed.

[0016] Through the above technical solution, the miniaturized, highly integrated photovoltaic inverter provided in this disclosure, when in use: at high temperatures, the air inside the cavity expands, increasing the air pressure inside the cavity. The expanded air inside the cavity is discharged into the expanded airbag through the ventilation component, reducing the air pressure inside the cavity and maintaining a stable air pressure inside the cavity. This avoids the shell and cover from bulging and deforming due to high pressure. Moreover, the shell and cover expand due to heat, closing the gaps and strengthening the sealing between the shell and cover, thereby enhancing the airtightness inside the cavity. At low temperatures, the air inside the cavity contracts, reducing the air pressure inside the cavity. The airbag contracts, allowing the air inside the airbag to be discharged into the cavity through the ventilation component, increasing the air pressure inside the cavity and maintaining a stable air pressure inside the cavity. This avoids the shell and cover from concave deformation due to low pressure. Moreover, the shell and cover contract when cooled, widening the gaps. However, under the action of the spring rebound force, the inner shell still abuts against the side of the sealing ring. At the same time, the inner shell is pushed and pressed against the side of the sealing ring by the encryption component, further enhancing the airtightness inside the cavity.

[0017] Other features and advantages of this disclosure will be described in detail in the following detailed description section. Attached Figure Description

[0018] The accompanying drawings are provided to further illustrate the present disclosure and form part of the specification. They are used together with the following detailed description to explain the present disclosure, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a three-dimensional structural diagram of the present invention.

[0019] Figure 2 This is a cross-sectional structural diagram of the present invention.

[0020] Figure 3 For the present invention Figure 2 Enlarged structural diagram at point A in the middle.

[0021] Figure 4 This is a schematic diagram of the thermal expansion cross-section structure of the outer shell of the present invention.

[0022] Figure 5 This is a schematic diagram of the shell shrinkage and cross-section structure of the present invention when cooled.

[0023] Figure 6 This is a three-dimensional structural diagram of the inner shell of the present invention.

[0024] Figure 7 This is a three-dimensional structural diagram of the back of the inner shell of the present invention.

[0025] Figure 8 This is a schematic diagram of the three-dimensional structure of the airbag of the present invention.

[0026] Explanation of reference numerals in the attached drawings: 100, Inverter body; 110, Outer casing; 120, Cover plate; 130, Inner casing; 140, Sealing ring; 141, Fastener; 142, Spring; 150, Cavity; 160, Housing; 170, Airbag; 180, Ventilation assembly; 181, Main air pipe; 182, Bellows; 183, First branch air pipe; 184, First one-way valve; 185, Second branch air pipe; 186, Second one-way valve; 187, Connecting rod; 188, Baffle plate; 190, Encryption assembly; 191, Cylinder; 192, Temperature-sensitive telescopic rod; 193, Sliding rod; 194, First wedge block; 195, Second wedge block; 196, Third wedge block; 197, Straight rod; 198, Fourth wedge block; 199, Air hole. Detailed Implementation

[0027] To make the above-described objects, features, and advantages of this disclosure more apparent and understandable, specific embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this disclosure. However, this disclosure can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this disclosure. Therefore, this disclosure is not limited to the specific embodiments disclosed below.

[0028] In the description of this disclosure, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are used only for the convenience of describing this disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this disclosure. The terms "first" and "second" are used to distinguish one element from another and do not have sequential or importance. Furthermore, in the following description, when referring to the accompanying drawings, the same reference numerals in different drawings denote the same or similar elements, which will not be repeated here.

[0029] In this disclosure, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.

[0030] According to some embodiments of this disclosure, a miniaturized, highly integrated photovoltaic inverter is provided, with reference to... Figures 1-8 As shown, the miniaturized, highly integrated photovoltaic inverter includes an inverter body 100, which includes a housing 110 and a cover plate 120 connected to the housing 110. Both the housing 110 and the cover plate 120 are made of metal, which has good protection and corrosion resistance, and also has the property of thermal expansion and contraction. An inner shell 130 is slidably disposed inside the housing 110. A sealing ring 140 that cooperates with the inner shell 130 is fixedly installed on the side of the cover plate 120. The sealing ring 140 is made of elastic rubber ring. The housing 110 and the cover plate 120 together form a cavity 150. The housing 110 and the cover plate 120 are connected by fasteners 141. The fasteners 141 are bolts, but can also be designed according to actual conditions. This is a mature existing technology and will not be described in detail here.

[0031] The cavity 150 is used to house the electronic components of the inverter body 100. The electronic components are mounted on the inner wall of the housing 110, so that the housing 110 and the cover plate 120 protect the internal electronic components. The cavity 150 contains air, and air also has the characteristics of thermal expansion and contraction. When the air is heated and expands, the air pressure inside the cavity 150 increases because the volume of the cavity 150 remains unchanged. When the air is cooled and contracts, the air pressure inside the cavity 150 decreases because the volume of the cavity 150 remains unchanged.

[0032] A spring 142 is provided inside the outer casing 110. The number of springs 142 is set to several. One end of the spring 142 is fixedly connected to the inner wall of the outer casing 110, and the other end of the spring 142 is fixedly connected to the inner casing 130. In the initial state, i.e. at room temperature, there is a gap between the outer casing 110 and the cover plate 120. The inner casing 130 abuts against the side of the sealing ring 140, and the spring 142 is in a compressed state. Under the action of the spring 142's rebound force, the inner casing 130 is pressed tightly against the sealing ring 140, thereby making the cavity 150 in a sealed state.

[0033] A housing 160 is fixedly installed on the outside of the outer shell 110. An airbag 170 is installed inside the housing 160. One end of the airbag 170 is fixedly connected to the inner wall of the housing 160. A ventilation assembly 180 is provided between the airbag 170 and the outer shell 110. The ventilation assembly 180 is used to control the airflow between the cavity 150 and the airbag 170. The ventilation assembly 180 includes a main air pipe 181 that is inserted into the side of the outer shell 110 and the inner shell 130, a corrugated pipe 182 fixedly connected to the middle of the main air pipe 181, a first branch air pipe 183 that communicates with the main air pipe 181 and is interference-fitted into the side of the airbag 170, a first one-way valve 184 fixedly connected to the middle of the first branch air pipe 183, a second branch air pipe 185 that communicates with the main air pipe 181 and is interference-fitted into the side of the airbag 170, and a second one-way valve 186 fixedly connected to the middle of the second branch air pipe 185.

[0034] The main air pipe 181 is fixedly inserted into the inner shell 130, and the main air pipe 181 is slidably inserted into the outer shell 110. The bellows 182 allows the inner shell 130 to move while the main air pipe 181 moves, thus preventing the main air pipe 181 from obstructing the movement of the inner shell 130. The outlet of the first one-way valve 184 is connected to the airbag 170, and the inlet of the second one-way valve 186 is connected to the airbag 170. The ventilation assembly 180 also includes a connecting rod 187 fixedly connected to the inner wall of the airbag 170 and a baffle 188 fixedly connected to the connecting rod 187. The baffle 188 alternately covers the ends of the first one-way valve 184 and the second one-way valve 186. In the initial state, i.e. at room temperature, the baffle 188 covers the end of the first one-way valve 184, closing the first one-way valve 184.

[0035] An encryption component 190 is provided between the inner shell 130 and the housing 160. The encryption component 190 is used to push the inner shell 130 to press against the side of the sealing ring 140 at low temperatures. The encryption component 190 includes a cylinder 191 fixedly installed on the inner wall of the housing 160, a temperature-sensitive telescopic rod 192 disposed on the inner side of the cylinder 191, a slide rod 193 slidably inserted into the side of the cylinder 191 and fixedly connected to the temperature-sensitive telescopic rod 192, and a first wedge block 194 fixedly installed at the end of the slide rod 193. The temperature-sensitive telescopic rod 192 is made of a metal rod with a high coefficient of thermal expansion. Through existing synthesis technology, it is possible to control the temperature of this metal rod. The range of deformation temperature and the degree of deformation of the rod are mature existing technologies and will not be elaborated here. In a certain range of high temperature environment, the thermotropic telescopic rod 192 expands to several times its original volume when heated, that is, its length increases, which can push the slide rod 193 to extend outward from the cylinder 191. Similarly, in a certain range of low temperature environment, the thermotropic telescopic rod 192 shrinks when cooled, that is, its length decreases, which can pull the slide rod 193 to retract inward from the cylinder 191. The slide rod 193 is set as an "L" shaped rod. The side of the slide rod 193 is fixedly connected to the outside of the airbag 170. The first wedge block 194 is located on the lower side of the airbag 170.

[0036] The encryption component 190 also includes a second wedge block 195 fixedly installed on the outside of the inner shell 130, a third wedge block 196 slidably disposed on the inside of the outer shell 110 and slidably engaged with the second wedge block 195, a straight rod 197 slidably inserted between the outer shell 110 and the housing 160 and fixedly connected with the third wedge block 196, and a fourth wedge block 198 fixedly installed at the end of the straight rod 197 and intermittently engaged with the first wedge block 194.

[0037] A vent 199 is provided on the side of the enclosure 160, allowing the interior of the enclosure 160 to communicate with the outside through the vent 199. This ensures that the air pressure inside the enclosure 160 remains balanced and stable. A dust filter can also be installed inside the vent 199 to minimize the entry of fine sand into the enclosure 160. However, since there are no electronic components requiring precision protection inside the enclosure 160, even if a small amount of fine sand enters the enclosure 160, it will not affect the normal operation of components such as the airbag 170 inside the enclosure 160. The sliding joint between the straight rod 197 and the outer shell 110 is sealed using conventional techniques, such as installing a sealing ring on the outer shell 110 at the sliding joint of the straight rod 197, with the sealing ring wrapping around the outside of the straight rod 197, thereby sealing the connection between the straight rod 197 and the outer shell 110. The gap between the outer shell 110 and the inner shell 130 is sealed, which is a prior art well known to those skilled in the art and will not be described in detail here. Alternatively, the sealing method can be designed according to the actual use. The outer shell 110 and the inner shell 130 are also sealed by conventional technical means to keep the cavity 150 sealed. For example, an elastic membrane is installed between the outer shell 110 and the inner shell 130. One side of the elastic membrane is connected to the inner wall of the outer shell 110, and the other side of the elastic membrane is connected to the outer wall of the inner shell 130. Because the elastic membrane is elastic, the outer shell 110 and the inner shell 130 can move relative to each other, and the gap between the outer shell 110 and the inner shell 130 can be sealed to prevent fine sand from entering the cavity 150 through the gap between the outer shell 110 and the inner shell 130, thereby keeping the cavity 150 sealed.

[0038] Through the above technical solution, the miniaturized, highly integrated photovoltaic inverter provided in this disclosure, when in use at high temperatures, experiences air expansion within cavity 150, increasing the air pressure within cavity 150. (Refer to...) Figure 2 , Figure 3 and Figure 4 As shown, the thermostatic expansion rod 192, when heated, pushes the slide rod 193 outward from the cylinder 191. This causes the slide rod 193 to move the end of the airbag 170 to the right, stretching and expanding the airbag 170 and increasing its volume. This results in the air pressure inside the airbag 170 being lower than the air pressure inside the cavity 150. Simultaneously, the end of the airbag 170 also moves the connecting rod 187 to the right, causing the connecting rod 187 to move the baffle 188 away from the first one-way valve 184 and seal the second one-way valve 186, thereby making the cavity 150... The internally expanded air is discharged into the inflated airbag 170 through the main air pipe 181, the first branch air pipe 183 and the first one-way valve 184 in sequence, which reduces the air pressure in the cavity 150 and keeps the air pressure in the cavity 150 within a reasonable range, so that the air pressure in the cavity 150 is in a balanced state, avoiding the situation where the outer shell 110 and the cover plate 120 bulge and deform due to high pressure. Moreover, the outer shell 110 and the cover plate 120 expand due to heat and close the gap, which strengthens the sealing between the outer shell 110 and the cover plate 120, thereby strengthening the airtightness of the cavity 150. At low temperatures, the air inside cavity 150 contracts, reducing the air pressure inside cavity 150. (Reference) Figure 2 , Figure 3 and Figure 5 As shown, the temperature-sensitive telescopic rod 192 contracts when cooled, pulling the slide rod 193 into the cylinder 191. This causes the slide rod 193 to move the end of the airbag 170 to the left, compressing and contracting the airbag 170. This reduces the volume of the airbag 170, making the air pressure inside the airbag 170 greater than the air pressure inside the cavity 150. Simultaneously, the end of the airbag 170 also moves the connecting rod 187 to the left, causing the connecting rod 187 to move the baffle 188 away from the second one-way valve 186, thus covering and sealing the first one-way valve 184. This allows the air inside the airbag 170 to... The air is discharged into the cavity 150 in sequence through the second one-way valve 186, the second branch pipe 185, and the main pipe 181, increasing the air pressure in the cavity 150 and keeping the air pressure in the cavity 150 within a reasonable range. This keeps the air pressure in the cavity 150 in a balanced state, preventing the outer shell 110 and the cover plate 120 from being deformed due to low pressure. Furthermore, the outer shell 110 and the cover plate 120 will shrink and widen the gap when they are cooled, but under the action of the spring 142, the inner shell 130 will still be in contact with the side of the sealing ring 140, maintaining the airtightness of the cavity 150. At the same time, the slide bar 193 also drives the first wedge block 194 to move to the left and closer to the fourth wedge block 198. Through the sliding engagement between the fourth wedge block 198 and the first wedge block 194, the fourth wedge block 198 drives the third wedge block 196 to move down through the straight rod 197. Then, through the sliding engagement between the third wedge block 196 and the second wedge block 195, the second wedge block 195 drives the inner shell 130 to move, thereby pushing the inner shell 130 to press against the side of the sealing ring 140, further strengthening the airtightness of the cavity 150. This allows the device to maintain a strong airtightness even in the desert with large day-night temperature differences, avoiding the problem of fine sand in the desert entering the outer shell 110 and covering the electronic components, thus affecting the normal use of the device.

[0039] The preferred embodiments of this disclosure have been described in detail above with reference to the accompanying drawings. However, this disclosure is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this disclosure, various simple modifications can be made to the technical solutions of this disclosure, and these simple modifications all fall within the protection scope of this disclosure.

[0040] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, this disclosure will not describe the various possible combinations separately.

[0041] Furthermore, various different embodiments of this disclosure can be combined in any way, as long as they do not violate the spirit of this disclosure, they should also be regarded as the content disclosed in this disclosure.

Claims

1. A miniaturized, highly integrated photovoltaic inverter, comprising an inverter body (100), characterized in that: The inverter body (100) includes a housing (110) and a cover plate (120) connected to the housing (110). An inner shell (130) is slidably disposed inside the housing (110). A sealing ring (140) that cooperates with the inner shell (130) is installed on the side of the cover plate (120). The housing (110) and the cover plate (120) together form a cavity (150). A housing (160) is installed on the outside of the housing (110). An airbag (170) is disposed inside the housing (160). A ventilation assembly (180) is disposed between the airbag (170) and the housing (110). The ventilation assembly (180) is used to control the gas flow between the cavity (150) and the airbag (170). An encryption component (190) is provided between the inner shell (130) and the box body (160). The encryption component (190) is used to push the inner shell (130) to press against the side of the sealing ring (140). At high temperature, the air that expands in the cavity (150) is discharged into the airbag (170) through the ventilation component (180), and the outer shell (110) and the cover plate (120) expand and close the gap due to heat. At low temperature, the air that contracts in the airbag (170) is discharged into the cavity (150) through the ventilation component (180), and the outer shell (110) and the cover plate (120) contract and expand the gap due to cold. However, the inner shell (130) is pressed against the side of the sealing ring (140) by the encryption component (190).

2. The miniaturized, highly integrated photovoltaic inverter according to claim 1, characterized in that: The outer casing (110) and the cover plate (120) are connected by fasteners (141), and the cavity (150) is used to accommodate the electronic components of the inverter body (100) and contains air.

3. The miniaturized, highly integrated photovoltaic inverter according to claim 1, characterized in that: A spring (142) is provided on the inner side of the outer shell (110). The number of springs (142) is set to several. One end of the spring (142) is connected to the inner wall of the outer shell (110), and the other end of the spring (142) is connected to the inner shell (130). In the initial state, there is a gap between the outer shell (110) and the cover plate (120). The inner shell (130) abuts against the side of the sealing ring (140), and the spring (142) is in a compressed state.

4. A miniaturized, highly integrated photovoltaic inverter according to claim 1, characterized in that: The ventilation assembly (180) includes a main air tube (181) that is inserted into the side of the outer shell (110) and the inner shell (130), a corrugated tube (182) connected to the middle of the main air tube (181), a first branch tube (183) that communicates with the main air tube (181) and is inserted into the side of the airbag (170), a first one-way valve (184) that is connected to the first branch tube (183), a second branch tube (185) that communicates with the main air tube (181) and is inserted into the side of the airbag (170), and a second one-way valve (186) that is connected to the second branch tube (185).

5. A miniaturized, highly integrated photovoltaic inverter according to claim 4, characterized in that: The outlet of the first one-way valve (184) is connected to the airbag (170), and the inlet of the second one-way valve (186) is connected to the airbag (170).

6. A miniaturized, highly integrated photovoltaic inverter according to claim 5, characterized in that: The ventilation assembly (180) further includes a connecting rod (187) connected to the inner wall of the airbag (170) and a baffle (188) connected to the connecting rod (187). The baffle (188) alternately covers the ends of the first one-way valve (184) and the second one-way valve (186). In the initial state, the baffle (188) covers the end of the first one-way valve (184).

7. A miniaturized, highly integrated photovoltaic inverter according to claim 1, characterized in that: The encryption component (190) includes a cylinder (191) installed on the inner wall of the housing (160), a thermo-sensitive telescopic rod (192) disposed on the inner side of the cylinder (191), a slide rod (193) slidably inserted into the side of the cylinder (191) and connected to the thermo-sensitive telescopic rod (192), and a first wedge block (194) installed at the end of the slide rod (193).

8. A miniaturized, highly integrated photovoltaic inverter according to claim 7, characterized in that: The slide bar (193) is configured as an "L" shaped bar, and the side of the slide bar (193) is connected to the outside of the airbag (170). The first wedge block (194) is located on the lower side of the airbag (170).

9. A miniaturized, highly integrated photovoltaic inverter according to claim 7, characterized in that: The encryption component (190) further includes a second wedge block (195) installed on the outside of the inner shell (130), a third wedge block (196) slidably disposed on the inside of the outer shell (110) and slidably engaged with the second wedge block (195), a straight rod (197) slidably inserted between the outer shell (110) and the housing (160) and connected to the third wedge block (196), and a fourth wedge block (198) installed at the end of the straight rod (197) and intermittently engaged with the first wedge block (194).

10. A miniaturized, highly integrated photovoltaic inverter according to claim 9, characterized in that: The box (160) has an air hole (199) on its side, so that the inside of the box (160) is connected to the outside through the air hole (199). The sliding joint between the straight rod (197) and the outer shell (110) is sealed by conventional technical means. The outer shell (110) and the inner shell (130) are also sealed by conventional technical means, so that the cavity (150) remains sealed.

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