Safety photovoltaic string inverter

Abstract

The invention relates to the technical field of inverters, in particular to a safety photovoltaic string type inverter which comprises a shell, an inverter body, a cover plate, a heat dissipation assembly and an isolation assembly, an air inlet and an air outlet are further formed in the shell, a fan is arranged on the heat dissipation assembly and located at the air inlet, and a plurality of isolation plates are arranged on the isolation assembly and located at the air outlet. The multiple isolation plates are slidably connected to the shell and located on the lower side of the air inlet and the lower side of the air outlet correspondingly, when the water level outside the shell rises or falls, the isolation assembly controls the isolation plates to rise or fall through the buoyancy of water so as to control opening and closing of the air inlet and the air outlet, and after the isolation plates shield the air inlet and the air outlet, the air inlet and the air outlet can be opened or closed. The heat dissipation assembly drives air in the installation cavity to flow circularly through the fan, the problems of short circuit of an internal circuit and power generation interruption caused by the fact that water enters the shell are solved, the heat dissipation problem in the installation cavity after closed protection is solved, and the safety and stability of the safety type photovoltaic string inverter are guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of inverters, and in particular to a safe photovoltaic string inverter. Background Art

[0002] With the depletion of global coal and oil resources and the attention paid by countries around the world to environmental pollution, grid-connected power generation technology and applications of renewable energy such as solar energy have become hot topics; as the core equipment of solar power generation systems, the reliability of safe photovoltaic string inverters determines the safe operation of photovoltaic systems. Among them, one of the important factors affecting the reliability of photovoltaic inverters is the heat dissipation performance of the inverter; the core components of the inverter are sensitive to temperature, and temperature changes will affect its opening and closing processes. When the temperature is too high, it will cause the performance of the power switch to decay or even damage. Therefore, the quality of the inverter's heat dissipation solution determines the performance and quality of the product; therefore, other heat dissipation devices are needed to assist in heat dissipation. Existing inverters generally lack good heat dissipation and basically adopt simple natural heat dissipation, which cannot meet the heat dissipation requirements of the inverter.

[0003] In view of the above problems, the prior art has proposed some solutions. For example, Chinese patent application number: CN202311643666.4 discloses a heat sink for a photovoltaic inverter and a photovoltaic inverter. The solution is provided with a fan, a first forward and reverse stepping motor, an air outlet window and an air inlet window inside the shell. The fan realizes the drainage of the airflow. When the fan is started, the external airflow enters the shell through the air inlet window, and the airflow in the shell is discharged through the air outlet window to accelerate the exchange of airflow inside and outside the shell and ensure the heat dissipation effect of the IGBT power module. The shell is also equipped with a first air guide and The first forward and reverse stepping motor controls the rotation angle of the first air guide and the second air guide; the rear end of the shell is also provided with a heat exchange box and a heat exchange pipe, the heat exchange pipe is serpentinely distributed in the heat exchange box, and each of the heat exchange cavities has a section of heat exchange pipe, so that when the coolant in the heat exchange pipe flows through the heat exchange pipe, it is heat exchanged in the heat exchange cavity to cool the coolant; the heat exchange pipe is also provided with a liquid pump, and when the liquid pump is started, the coolant in the heat exchange pipe and the heat exchange tube can flow, so that the airflow blown into the shell by the fan is cold air, Ensure the heat dissipation effect of the IGBT power module; when the photovoltaic inverter is in use, when the local temperature of a certain area on the IGBT power module is too high, the radiator is used to centrally blow air to cool down the local area with too high temperature; when the radiator is working, the cooperation of the first air guide and the second air guide can guide the airflow so that the airflow can be blown to the overheated area of ​​the IGBT power module, and when the liquid pump is started, the coolant in the heat exchange pipe and the heat exchange tube can flow, so that the airflow blown into the shell by the fan is cold air, ensuring the heat dissipation effect of the IGBT power module; Although the liquid pump used in the above scheme can solve the heat dissipation demand of the enclosed photovoltaic inverter, the cost of the liquid pump is high. When a fan is used for heat dissipation in a closed photovoltaic inverter, the heat dissipation effect is poor due to the lack of air circulation inside and outside. For this reason, the prior art often opens heat dissipation ports on the shell of the photovoltaic inverter to exchange air inside and outside. However, when the photovoltaic inverter with open heat dissipation ports is used in some low-lying areas and sites with poor drainage or extreme climatic conditions, the environment increases the risk of the photovoltaic inverter being flooded. Moisture can easily cause internal circuit short circuits and damage electronic components. The photovoltaic inverter will not be able to work normally, resulting in power generation interruption.

[0004] Therefore, when photovoltaic inverters work in low-lying areas, poorly drained sites or extreme climatic conditions, the risk of photovoltaic inverters being flooded is increased due to environmental influences. Moisture can easily cause internal circuit short circuits and damage electronic components. The photovoltaic inverter will not be able to work normally, resulting in power generation interruptions. At the same time, in order to meet the heat dissipation problem of photovoltaic inverters after closed protection, a safe photovoltaic string inverter is proposed. Summary of the invention

[0005] The purpose of the present invention is to provide a safe photovoltaic string inverter to solve the problem that when the safe photovoltaic string inverter works in a low-lying area, a site with poor drainage or an environment with extreme climatic conditions, the risk of the photovoltaic inverter being flooded is increased due to environmental influences, moisture can easily cause an internal circuit short circuit and damage electronic components, the safe photovoltaic string inverter will be unable to work normally, resulting in power generation interruption, and the heat dissipation problem of the safe photovoltaic string inverter after enclosed protection.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A safe photovoltaic string inverter comprises a shell, an inverter body and a cover plate, wherein the inverter body is installed in the shell, a mounting cavity is provided in the shell, the inverter body is installed in the mounting cavity, the cover plate is installed in the front end of the shell, a heat dissipation component and an isolation component are further provided on the shell, an air inlet and an air outlet are provided on the shell, a fan is provided on the heat dissipation component, the fan is installed in the shell, and the fan is located at the air inlet, a plurality of isolation plates are provided on the isolation component, the plurality of isolation plates are slidably connected to the shell, and the plurality of isolation plates are respectively located at the lower side of the air inlet and the air outlet, when the water level outside the safe photovoltaic string inverter rises or falls, the isolation component passes through the insulation component, and the insulation component is sealed with ... The buoyancy of the water controls the rise and fall of the isolation plate to complete the opening and closing of the air inlet and the air outlet. After the isolation plate blocks the air inlet and the air outlet, the heat dissipation component drives the air circulation in the installation cavity through the fan, thereby avoiding the risk of the photovoltaic inverter being flooded due to environmental influences when the safety photovoltaic string inverter works in low-lying areas, sites with poor drainage or extreme climatic conditions. Moisture can easily cause internal circuit short circuits and damage electronic components, making the photovoltaic inverter unable to work normally, resulting in power generation interruptions, and the problem of heat dissipation of the safety photovoltaic string inverter after closed protection, thereby ensuring the safety and stability of the safety photovoltaic string inverter.

[0008] Optionally, the heat dissipation component can be a liquid cooling system, a heat pipe or a thermally conductive material. All three of the above heat dissipation components can dissipate heat for the safe photovoltaic string inverter. The liquid cooling system carries away heat through the flow of liquid and is suitable for high-power inverters, but the liquid cooling system is complex and has high maintenance requirements; the heat pipe uses the phase change principle to conduct heat to the radiator, but the cost of the heat pipe is relatively high and requires precise design; the thermally conductive material is used to connect the component and the radiator to enhance heat conduction, but the thermally conductive material cannot dissipate heat from the heat-generating components in time; therefore, the above three heat dissipation components are not preferred solutions of the present invention.

[0009] Preferably, the heat dissipation assembly includes a heat dissipation baffle, which is installed in the shell, and the heat dissipation baffle and the inner wall of the shell are combined into a heat dissipation channel, and the two ends of the heat dissipation channel are divided into a circulation inlet and a circulation outlet, and the circulation inlet and the circulation outlet are respectively located on the upper and lower sides of the shell, and a cooling cavity is provided between the fan and the air inlet, and the circulation outlet is connected to the cooling cavity, thereby avoiding the problem that the internal components of the safety photovoltaic string inverter cannot be cooled through the air inlet and the air outlet after closed protection, resulting in overheating performance attenuation or even damage of the power switch, thereby ensuring the conversion performance and safety of the safety photovoltaic string inverter.

[0010] Optionally, the isolation component includes a sealing valve, a diaphragm and a vacuum isolation container. All of the above three components can isolate water from air. The sealing valve isolates water from air through a mechanical structure (such as a rubber seal, a metal seal) when the valve is open or closed, but the sealing valve cannot automatically isolate water from air and requires manual operation. The diaphragm uses a membrane made of elastic material to separate liquid and gas, and is usually used in pumps or containers. However, the diaphragm material may age due to long-term contact with liquid. The vacuum isolation container uses a vacuum layer to isolate water from external air, and is usually used for heat preservation and special liquid storage. However, the vacuum isolation container has a high cost and a complex manufacturing process. Therefore, the above three isolation components are not preferred solutions of the present invention.

[0011] Preferably, the isolation assembly includes a floating block, and both side walls of the shell are provided with a plurality of isolation grooves, and the plurality of isolation grooves are respectively arranged at the air inlet and the air outlet on both sides of the shell, the isolation plate and the floating block are slidably connected in the isolation groove, and the floating block is located on the lower side of the isolation plate, and a supporting spring is installed between the floating block and the isolation plate, and the isolation plate is located between the supporting spring and the shell, so as to prevent water from entering the installation cavity through the air inlet and the air outlet after the water level rises, causing an internal circuit short circuit, damaging electronic components, and making the photovoltaic inverter unable to work normally, resulting in power generation interruption. After the water level drops, the isolation plate falls back to maintain the heat dissipation effect in the installation cavity, thereby ensuring the safety and stability of the safety photovoltaic string inverter.

[0012] Preferably, a pressure surface is provided on the side of the isolation plate away from the shell, the pressure surface is inclined to the isolation plate surface, and the inclination angle of the pressure surface is set in the direction of the shell, the upper end of the support spring is slidably connected to the pressure surface, and the lower end is installed on the upper end surface of the floating block, thereby avoiding the problem of the isolation plate shaking due to the fluctuation of water flow after being tightly attached, thereby reducing the sealing effect between the isolation plate and the shell, and ensuring the sealing of the safe photovoltaic string inverter.

[0013] Preferably, a plurality of reset plates are provided on the outer wall of the shell, and the reset plate includes a fixed end and a movable end, the fixed end is installed on the upper side wall of the isolation groove, the movable end is connected to the fixed end, and the reset plates are installed on the top of the plurality of isolation grooves, and the reset plate is made of thermosensitive metal. When the temperature of the reset plate rises, the movable end bends toward the bottom of the isolation groove and pushes the isolation plate downward, thereby avoiding the problem that the isolation plate cannot be separated from the air inlet and outlet in time after the water level drops, resulting in overheating of the internal components of the equipment, thereby ensuring the stability of the safe photovoltaic string inverter.

[0014] Preferably, a locking groove is obliquely opened on the upper end surface of the isolation plate, and the opening of the locking groove points in the direction of the movable end. When the isolation plate rises, the movable end is slidably connected to the upper end surface of the isolation plate and embedded in the locking groove. When the temperature of the reset plate drops, the movable end bends toward the top of the isolation groove, thereby avoiding the problem of shaking of the isolation plate due to fluctuations in water flow after the water level rises, which in turn causes moisture to enter the installation cavity, thereby ensuring the sealing of the safe photovoltaic string inverter.

[0015] Preferably, a locking block is installed at the upper end of the supporting spring sheet, and the locking block is triangular in shape. The locking block is slidably connected to the pressure surface, and a locking surface is provided on the side of the isolation groove close to the pressure surface. The angle of the upper end of the locking block is the same as the angle between the pressure surface and the locking surface. When the isolation plate and the floating block rise to the top, the locking block will be embedded in the angle between the pressure surface and the locking surface, thereby avoiding the problem that when the temperature rises, the reset plate exerts pressure on the isolation plate after being heated, or the water flow fluctuations cause the floating block to move, causing the isolation plate to slide downward, and then causing moisture to enter the installation cavity, thereby ensuring the stability of the safe photovoltaic string inverter.

[0016] Preferably, the air outlet and the air inlet are respectively arranged at the upper and lower ends of the shell, the isolation plate is slidably connected to the outer side wall of the shell, the isolation plate is provided with a close contact surface close to the shell side, a plurality of heat sinks are evenly installed in the heat dissipation channel, a plurality of the heat sinks are connected to the inner side wall of the shell, and the lower ends of the plurality of the heat sinks extend to the outside of the shell, and the portions of the plurality of heat sinks extending outside the shell are provided with a pre-cooling part, which are located on the lower side of the air outlet and the air inlet, thereby avoiding the problem of overheating of components in the installation cavity when the safety photovoltaic string inverter is closed, and also avoiding the problem of moisture entering the installation cavity due to incomplete close contact between the isolation plate and the shell, thereby ensuring the heat dissipation effect and safety of the safety photovoltaic string inverter.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. The present invention provides a heat dissipation component and an isolation component on the shell. When the water level outside the shell rises or falls, the isolation component controls the rise and fall of the isolation plate through the buoyancy of water to complete the opening and closing of the air inlet and the air outlet. After the isolation plate blocks the air inlet and the air outlet, the heat dissipation component drives the air in the installation cavity to circulate through the fan, thereby avoiding the problem of moisture entering the safety photovoltaic string inverter to cause an internal circuit short circuit and power generation interruption, and the heat dissipation problem in the installation cavity after closed protection, thereby ensuring the safety and stability of the safety photovoltaic string inverter.

[0019] 2. The present invention provides a pressure surface on the side of the isolation plate away from the shell, the pressure surface is inclined to the isolation plate surface, and the inclination angle of the pressure surface is set in the direction of the shell, the upper end of the support spring is slidably connected to the pressure surface, and the lower end is installed on the upper end surface of the floating block, thereby avoiding the problem that the isolation plate cannot be close to the shell after rising, causing moisture to enter the installation cavity through the gap between the isolation plate and the shell, thereby causing an internal circuit short circuit, damaging electronic components, making the photovoltaic inverter unable to work normally, and causing power generation interruption, thereby ensuring the safety of the safety-type photovoltaic string inverter.

[0020] 3. The present invention further provides a plurality of reset plates on the outer wall of the shell, wherein the fixed end is installed on the upper side wall of the isolation groove, the movable end is connected to the fixed end, and the plurality of reset plates are installed on the top of the plurality of isolation grooves. The reset plates are made of thermosensitive metal. When the temperature of the reset plates rises, the movable end bends toward the bottom of the isolation groove and pushes the isolation plate downward, thereby avoiding the problem that the isolation plate cannot be separated from the air inlet and outlet in time after the water level drops, resulting in overheating of the internal components of the equipment, thereby ensuring the stability of the safe photovoltaic string inverter. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the safe photovoltaic string inverter of the present invention;

[0022] Figure 2 An exploded diagram of the safe photovoltaic string inverter of the present invention;

[0023] Figure 3 The left side is a view of the safe photovoltaic string inverter of the present invention;

[0024] Figure 4 For the present invention Figure 3 Sectional view at AA in the middle;

[0025] Figure 5 For the present invention Figure 3 A partial enlarged view of point B in the middle;

[0026] Figure 6It is a structural schematic diagram of the safety photovoltaic string inverter of the present invention when the support spring locks the isolation plate;

[0027] Figure 7 For the present invention Figure 4 A partial enlarged view of point C in the middle;

[0028] Figure 8 The present invention is a schematic structural diagram of the locking block of the safety photovoltaic string inverter when locking the isolation plate.

[0029] In the figure: 1. shell; 2. inverter body; 3. cover plate; 401. air inlet; 402. air outlet; 501. fan; 502. heat dissipation baffle; 503. heat dissipation channel; 504. circulation inlet; 505. circulation outlet; 601. isolation plate; 602. floating block; 603. isolation groove; 604. supporting spring; 605. contact surface; 701. pressure surface; 702. reset plate; 703. locking groove; 704. locking block; 801. installation cavity; 802. cooling cavity; 803. pre-cooling part; 804. fixed end; 805. movable end; 806. locking surface; 807. heat dissipation fin. DETAILED DESCRIPTION

[0030] See also Figures 1 to 8 The present invention provides a safe photovoltaic string inverter, and the technical solution is as follows:

[0031] A safe photovoltaic string inverter comprises a shell 1, an inverter body 2 and a cover plate 3. The shell 1 is provided with an installation cavity 801, the inverter body 2 is installed in the installation cavity 801, the cover plate 3 is installed at the front end of the shell 1, and the shell 1 is also provided with a heat dissipation component and an isolation component. The shell 1 is provided with an air inlet 401 and an air outlet 402. The heat dissipation component is provided with a fan 501, the fan 501 is installed in the shell 1, and the fan 501 is located at the air inlet 401. The isolation component is provided with a plurality of isolation plates 601, the plurality of isolation plates 601 are all slidably connected to the shell 1, and the plurality of isolation plates 601 are respectively located at the lower sides of the air inlet 401 and the air outlet 402. When the water level outside the safe photovoltaic string inverter rises or falls, the isolation component controls the rise and fall of the isolation plate 601 through the buoyancy of water to complete the opening of the air inlet 401 and the air outlet 402. To prevent the problem of overheating of internal components due to the inability of the installation cavity 801 to exchange air with the outside through the air outlet 402 and the air inlet 401 after the isolation plate 601 blocks the air inlet 401 and the air outlet 402, the heat dissipation component drives the air in the installation cavity 801 to circulate through the fan 501, and cools the shell 1 itself through the moisture outside the shell 1, thereby avoiding the risk of the photovoltaic inverter being flooded due to environmental influences when the safety photovoltaic string inverter works in low-lying areas, poorly drained sites or extreme climatic conditions, and the moisture can easily cause internal circuit short circuits and damage electronic components, making the photovoltaic inverter unable to work normally, resulting in power generation interruptions, and the heat dissipation problem of the safety photovoltaic string inverter after closed protection, thereby ensuring the safety and stability of the safety photovoltaic string inverter.

[0032] See also Figure 1 to Figure 2 and Figure 4The heat dissipation assembly includes a heat dissipation baffle 502, which is installed in the shell 1. The heat dissipation baffle 502 and the inner wall of the shell 1 are combined into a heat dissipation channel 503. The two ends of the heat dissipation channel 503 are divided into a circulation inlet 504 and a circulation outlet 505. The circulation inlet 504 and the circulation outlet 505 are respectively located at the upper and lower sides of the shell 1. A cooling cavity 802 is provided between the fan 501 and the air inlet 401. The circulation outlet 505 is connected to the cooling cavity 802. When the isolation plate 601 blocks the air inlet 401 and the air outlet 402, the air in the installation cavity 801 cannot pass through the air outlet 402. 02 and the air inlet 401 exchange flow with the outside. At this time, the fan 501 will drive the hot air on the upper side of the shell 1 to the lower side of the shell 1 through the heat dissipation channel 503, and then blow it upward from the lower side through the fan 501, so that the internal air circulates and cools the shell 1 itself through the moisture outside the shell 1, avoiding the problem that the internal components of the safety photovoltaic string inverter cannot be cooled through the air inlet 401 and the air outlet 402 after closed protection, resulting in overheating performance degradation or even damage of the power switch, thereby ensuring the conversion performance and safety of the safety photovoltaic string inverter.

[0033] It is worth noting that the air outlet 402 and the air inlet 401 are respectively arranged at the upper and lower ends of the shell 1, the isolation plate 601 is slidably connected to the outer wall of the shell 1, and the isolation plate 601 is provided with a close surface 605 on the side close to the shell 1, and a plurality of heat dissipation fins 807 are evenly installed in the heat dissipation channel 503, and the plurality of heat dissipation fins 807 are connected to the inner wall of the shell 1, and the lower ends of the plurality of heat dissipation fins 807 extend to the outside of the shell 1, and the portion of the plurality of heat dissipation fins 807 extending to the outside of the shell 1 is set as a pre-cooling part 803, and the pre-cooling part 803 is located at the lower side of the air outlet 402 and the air inlet 401. When the water level When the temperature rises gradually, the pre-cooling part 803 will come into contact with the moisture in advance. At this time, the pre-cooling part 803 will conduct the lower temperature in the water to the cooling chamber 802 in advance, so that the temperature in the cooling chamber 802 drops, and the cold air is transmitted to the installation chamber 801 through the fan 501 to cool the inverter body 2, thereby avoiding the problem of overheating of the components in the installation chamber 801 when the safety photovoltaic string inverter is closed, and also avoiding the problem of moisture entering the installation chamber 801 because the isolation plate 601 and the shell 1 are not completely tight, thereby ensuring the heat dissipation effect and safety of the safety photovoltaic string inverter.

[0034] See also Figures 1 to 8The isolation assembly includes a floating block 602. A plurality of isolation grooves 603 are provided on both side walls of the shell 1. The plurality of isolation grooves 603 are respectively provided at the air inlet 401 and the air outlet 402 on both sides of the shell 1. The isolation plate 601 and the floating block 602 are both slidably connected in the isolation groove 603. The floating block 602 is located at the lower side of the isolation plate 601. A supporting spring 604 is installed between the floating block 602 and the isolation plate 601. At the same time, the isolation plate 601 is located between the supporting spring 604 and the shell 1. When the water level rises, the floating block 602 is supported by the isolation plate 601. The buoyancy of the water supports the upward movement and drives the isolation plate 601 to slide upward. At this time, the support spring 604 applies pressure to the isolation plate 601 in the direction of the shell 1 through its own elastic force, so that the isolation plate 601 is always close to the shell 1, avoiding the problem that water flows into the installation cavity 801 through the air inlet and the air outlet after the water level rises, causing an internal circuit short circuit, damaging electronic components, and making the photovoltaic inverter unable to work normally, resulting in power generation interruption, thereby ensuring the safety and stability of the safety photovoltaic string inverter.

[0035] A pressure surface 701 is provided on the side of the isolation plate 601 away from the shell 1. The pressure surface 701 is inclined to the plate surface of the isolation plate 601, and the inclination angle of the pressure surface 701 is set in the direction of the shell 1. The upper end of the support spring 604 is slidably connected to the pressure surface 701, and the lower end is installed on the upper end surface of the floating block 602. Since the pressure surface 701 is inclined to the plate surface of the isolation plate 601, and the inclination angle of the pressure surface 701 is set in the direction of the shell 1, when the floating block 602 drives the isolation plate 601 to move upward to the top of the isolation groove 603, the buoyancy of the floating block 602 will be applied to the pressure surface 701 through the support spring 604. When the upper end of the support spring 604 is gradually When gradually approaching the top of the isolation groove 603, the opening angle of the support spring 604 will increase. The increased opening angle increases the elastic force of the support spring 604. At this time, the pressure of the support spring 604 on the pressure surface 701 will also increase. This design converts the buoyancy of the floating block 602 into the pressure of the isolation plate 601 on the shell 1, avoiding the isolation plate 601 shaking due to the fluctuation of the water flow after being tightly attached, thereby reducing the sealing effect between the isolation plate 601 and the shell 1. At the same time, it avoids the problem of water seeping into the shell 1 due to the increase in water pressure caused by the rising water level, thereby ensuring the sealing of the safe photovoltaic string inverter.

[0036] A plurality of reset sheets 702 are also provided on the outer wall of the shell 1, and the reset sheets 702 include a fixed end 804 and a movable end 805. The plurality of reset sheets 702 are installed on the top of the plurality of isolation grooves 603. The reset sheets 702 are made of thermosensitive metal. When the temperature of the reset sheets 702 rises, the movable end 805 bends toward the bottom of the isolation groove 603. When the water level drops, the reset sheets 702 will be separated from the cooling of the water and gradually heat up. The movable end 805 on the gradually heated reset sheet 702 bends toward the bottom of the isolation groove 603 and applies downward pressure to the upper end surface of the isolation plate 601, so that the isolation plate 601 slides downward, thereby avoiding the problem that the isolation plate 601 cannot be reset due to the resistance of the supporting spring sheet 604 after the water level drops, resulting in overheating of the internal components of the equipment, thereby ensuring the stability of the safe photovoltaic string inverter.

[0037] A locking groove 703 is obliquely provided on the upper end surface of the isolation plate 601, and the opening of the locking groove 703 points to the direction of the movable end 805. When the isolation plate 601 does not block the air inlet 401 and the air outlet 402, there is air circulation. At this time, the temperature of the reset plate 702 is relatively low and the bending state is small. When the isolation plate 601 rises, the movable end 805 is slidably connected to the upper end surface of the isolation plate 601 and the component is embedded in the locking groove 703 as the isolation plate 601 rises. When the water level submerges the reset plate 702, the temperature of the reset plate 702 will drop and the reset plate 702 will straighten. At this time, since the reset plate 702 has been embedded in the locking groove 703, the force of the reset plate 702 straightening will apply an upward pulling force to the isolation plate 601, thereby avoiding the problem that the isolation plate 601 shakes due to the fluctuation of water flow after the water level rises, and then causes moisture to enter the installation cavity 801, thereby ensuring the sealing of the safe photovoltaic string inverter.

[0038] A locking block 704 is installed on the upper end of the supporting spring 604. The locking block 704 is triangular and is slidably connected to the pressure surface 701. A locking surface 806 is provided on the side of the isolation groove 603 close to the pressure surface 701. The angle of the upper end of the locking block 704 is the same as the angle between the pressure surface 701 and the locking surface 806. When the isolation plate 601 and the floating block 602 rise to the top, the locking block 704 will be embedded in the angle between the pressure surface 701 and the locking surface 806. When the water level outside the shell 1 has not dropped, the floating block 602 will not be able to fall back to the bottom of the isolation groove 603 due to the influence of buoyancy. At this time, if the reset plate 702 is heated and the movable end 805 applies pressure to the bottom of the isolation groove 603, or the fluctuation of the water flow causes the isolation plate 601 to shake, the force of the isolation plate 601 sliding downward will be applied to the locking block 704 through the pressure surface 701. At this time, since the locking block 704 is connected to the upper end of the supporting spring sheet 604, the buoyancy of the floating block 602 will be applied to the locking block 704 through the supporting spring sheet 604. At this time, the upward pressure will offset the downward sliding force of the isolation plate 601. At the same time, due to the inclined setting of the pressure surface 701, the force applied by the isolation plate 601 on the locking block 704 will generate a component force in the direction of the locking surface 806. At this time, the friction force generated between the locking surface 806 and the locking block 704 will also offset the downward sliding force of the isolation plate 601, thereby locking the isolation plate 601, avoiding the problem that when the temperature rises, the reset plate 702 exerts pressure on the isolation plate 601 after being heated, or the water flow fluctuation causes the floating block 602 to move, causing the isolation plate 601 to slide downward, thereby causing moisture to enter the installation cavity 801, thereby ensuring the stability of the safe photovoltaic string inverter.

[0039] While working, see Figures 1 to 8When the water level outside the housing 1 of the safety photovoltaic string inverter rises to the position of the floating block 602, the floating block 602 will be supported by the buoyancy of the water to move upward. At this time, since the upper end of the support block is slidably connected to the pressure surface 701, and the pressure surface 701 and the isolation plate 601 are at an angle, and the pressure applied by the support spring 604 to the pressure surface 701 makes the floating block 602 drive the isolation plate 601 to rise during the rising process, and when the floating block 602 drives the isolation plate 601 to move upward to the top of the isolation groove 603, the buoyancy of the floating block 602 will be applied to the pressure surface 701 through the support spring 604. When the support spring 604 When the upper end of the isolation plate 601 gradually approaches the top of the isolation groove 603, the pressure of the support spring 604 on the pressure surface 701 will gradually increase. This design converts the buoyancy of the floating block 602 into the pressure of the isolation plate 601 on the shell 1. At the same time, the locking block 704 will be embedded in the angle between the pressure surface 701 and the locking surface 806. At this time, due to the elastic force of the support spring 604 itself, the isolation plate 601 exerts pressure in the direction of the shell 1, so that the isolation plate 601 is always close to the shell 1. During the rising process of the isolation plate 601, the lower end of the reset plate 702 will be embedded in the locking groove 703. When the water level rises and submerges the reset plate 702, the reset plate 702 is The sheet 702 will be affected by the water temperature and gradually cool down. The movable end 805 on the gradually cooled reset sheet 702 will bend toward the top of the isolation groove 603. At this time, since the movable end 805 has been embedded in the locking groove 703, the movable end 805 bent toward the top of the isolation groove 603 will apply an upward pulling force to the isolation plate 601. At the same time, the isolation plate 601 will completely block the air inlet 401 and the air outlet 402. At this time, the installation cavity 801 will not be able to exchange air with the outside through the air outlet 402 and the air inlet 401. At this time, the fan 501 will drive the hot air on the upper side of the shell 1 through the heat dissipation channel 503. It moves to the lower side of the shell 1 and is blown upward from the lower side by the fan 501, so that the internal air circulates and the shell 1 itself is cooled by the moisture outside the shell 1. It is worth noting that when the water level gradually rises, the pre-cooling part 803 has been in contact with the moisture in advance. At this time, the pre-cooling part 803 pre-transmits the lower temperature in the water to the heat dissipation fins 807 in the cooling chamber 802. The high temperature in the cooling chamber 802 is offset by the low temperature on the heat dissipation fins 807, so that the temperature in the cooling chamber 802 drops. The cold air is transmitted to the installation chamber 801 by the fan 501 to cool the inverter body 2.

[0040] Furthermore, when the water level drops, the reset plate 702 will be separated from the cooling of the water and gradually heat up. The movable end 805 on the gradually heated reset plate 702 bends toward the bottom of the isolation groove 603. In the process of the movable end 805 bending toward the bottom of the isolation groove 603, if the water level outside the shell 1 does not drop and break away from the control of the float 602, the float 602 will not be able to fall back to the bottom of the isolation groove 603 due to the influence of buoyancy. At this time, the locking block 704 is embedded in the angle between the pressure surface 701 and the locking surface 806 to lock the isolation plate 601 at all times. When the water level is completely out of control of the float, the pressure of the movable end 805 will push the isolation plate 601 to slide downward. It is worth noting that this action occurs when the isolation plate 601 cannot slide down by its own gravity.

[0041] A specific embodiment of the present invention is described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above described embodiment. For those skilled in the art, various changes, modifications, substitutions and variations of these embodiments without departing from the principles and ideas of the present invention should still fall within the scope of protection of the present invention.

Claims

1. A safe photovoltaic string inverter, comprising a housing (1), an inverter body (2) and a cover plate (3), wherein the inverter body (2) is installed in the housing (1), a mounting cavity (801) is provided in the housing (1), the inverter body (2) is installed in the mounting cavity (801), and the cover plate (3) is installed at the front end of the housing (1), characterized in that: The shell (1) is provided with a heat dissipation component and an isolation component. The shell (1) is also provided with an air inlet (401) and an air outlet (402). The heat dissipation component is provided with a fan (501). The fan (501) is installed in the shell (1) and is located at the air inlet (401). The isolation component is provided with a plurality of isolation plates (601). The plurality of isolation plates (601) are all slidably connected to the shell (1), and the plurality of isolation plates (601) are respectively The isolation components are respectively located at the lower side of the air inlet (401) and the air outlet (402). When the water level outside the safety photovoltaic string inverter rises or falls, the isolation component controls the rise and fall of the isolation plate (601) through the buoyancy of the water to complete the opening and closing of the air inlet (401) and the air outlet (402). After the isolation plate (601) blocks the air inlet (401) and the air outlet (402), the heat dissipation component drives the air in the installation cavity (801) to circulate through the fan (501).

2. A safe photovoltaic string inverter according to claim 1, characterized in that: The heat dissipation component comprises a heat dissipation baffle (502), the heat dissipation baffle (502) being installed in the shell (1), the heat dissipation baffle (502) and the inner wall of the shell (1) being combined into a heat dissipation channel (503), the two ends of the heat dissipation channel (503) being divided into a circulation inlet (504) and a circulation outlet (505), the circulation inlet (504) and the circulation outlet (505) being respectively located at the upper and lower sides of the shell (1), a cooling chamber (802) being provided between the fan (501) and the air inlet (401), and the circulation outlet (505) being communicated with the cooling chamber (802).

3. A safe photovoltaic string inverter according to claim 2, characterized in that: The isolation assembly comprises a floating block (602), and a plurality of isolation grooves (603) are provided on both side walls of the shell (1). The plurality of isolation grooves (603) are respectively provided at the air inlet (401) and the air outlet (402) on both sides of the shell (1). The isolation plate (601) and the floating block (602) are both slidably connected in the isolation grooves (603), and the floating block (602) is located at the lower side of the isolation plate (601). A supporting spring sheet (604) is installed between the floating block (602) and the isolation plate (601), and the isolation plate (601) is located between the supporting spring sheet (604) and the shell (1).

4. A safe photovoltaic string inverter according to claim 3, characterized in that: A pressure surface (701) is provided on the side of the isolation plate (601) away from the shell (1), and the pressure surface (701) is inclined to the plate surface of the isolation plate (601), and the inclination angle of the pressure surface (701) is set in the direction of the shell (1). The upper end of the support spring (604) is slidably connected to the pressure surface (701), and the lower end is installed on the upper end surface of the floating block (602).

5. A safe photovoltaic string inverter according to claim 4, characterized in that: A plurality of reset sheets (702) are also provided on the outer side wall of the shell (1), and the reset sheet (702) includes a fixed end (804) and a movable end (805). The fixed end (804) is mounted on the upper side wall of the isolation groove (603), and the movable end (805) is connected to the fixed end (804), and the plurality of reset sheets (702) are mounted on the top of the plurality of isolation grooves (603). The reset sheet (702) is made of a heat-sensitive metal, and when the temperature of the reset sheet (702) rises, the reset sheet (702) bends toward the bottom of the isolation groove (603).

6. A safe photovoltaic string inverter according to claim 5, characterized in that: A locking groove (703) is obliquely provided on the upper end surface of the isolation plate (601), and the opening of the locking groove (703) points in the direction of the movable end (805). When the isolation plate (601) rises, the movable end (805) is slidably connected to the upper end surface of the isolation plate (601) and embedded in the locking groove (703). When the temperature of the reset plate (702) drops, the movable end (805) bends toward the top of the isolation groove (603).

7. A safe photovoltaic string inverter according to claim 6, characterized in that: A locking block (704) is installed at the upper end of the supporting spring sheet (604), and the locking block (704) is triangular in shape. The locking block (704) is slidably connected to the pressure surface (701), and a locking surface (806) is provided on the side of the isolation groove (603) close to the pressure surface (701). The angle of the upper end of the locking block (704) is the same as the angle between the pressure surface (701) and the locking surface 806. When the isolation plate (601) and the floating block (602) rise to the top, the locking block (704) will be embedded in the angle between the pressure surface (701) and the locking surface (806).

8. A safe photovoltaic string inverter according to claim 3, characterized in that: The air outlet (402) and the air inlet (401) are respectively arranged at the upper and lower ends of the shell (1); the isolation plate (601) is slidably connected to the outer wall of the shell (1); the isolation plate (601) is provided with a contact surface (605) on the side close to the shell (1); a plurality of heat dissipation fins (807) are evenly installed in the heat dissipation channel (503); the plurality of heat dissipation fins (807) are all connected to the inner wall of the shell (1); and the lower ends of the plurality of heat dissipation fins (807) extend to the outside of the shell (1); the portion of the plurality of heat dissipation fins (807) extending to the outside of the shell (1) is set as a pre-cooling part (803); and the pre-cooling part (803) is located at the lower side of the air outlet (402) and the air inlet (401).

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