Miniature photovoltaic inverter

Abstract

The utility model discloses a small photovoltaic inverter which comprises a photovoltaic inverter body, a circuit board is installed in the photovoltaic inverter body, and a temperature sensor is fixedly inserted in the top of the photovoltaic inverter body. According to the utility model, the air inlet cover, the air duct, the exhaust cover, the temperature sensor, the cold water tank, the water outlet pipe, the water return pipe, the semiconductor chilling plate, the cooling fan, the heat exchange pipe, the water pump, the blowing fan and the PLC are adopted, the temperature sensor is used for detecting the internal temperature of the inverter, and when the detected temperature exceeds the preset range of the PLC, the temperature sensor is switched on; the PLC starts the blowing fan, the semiconductor chilling plate, the cooling fan and the water pump, on one hand, the blowing fan in the air duct filters outside air through the dust filter screen, then introduces the filtered air into the photovoltaic inverter body and discharges hot air through the exhaust hood, and on the other hand, the water pump introduces water cooled at the cold end of the semiconductor chilling plate into the heat exchange pipe; the heat exchange tubes which are arranged in the gaps of the cooling fins in a snakelike structure absorb heat.

Description

Technical Field

[0001] The utility model relates to the technical field of photovoltaic inverters, in particular to a small photovoltaic inverter. Background Art

[0002] As we all know, photovoltaic inverter, also known as power regulator, is the application of power electronics technology in the field of solar power generation. The industry's technical level is closely related to the development of power electronics devices, circuit topology, dedicated processor chip technology, magnetic material technology and control theory technology. Photovoltaic inverter is a power regulation device composed of semiconductor devices. It is mainly used to convert DC power into AC power. It is generally composed of a boost circuit and an inverter bridge circuit. According to the use of the inverter in the photovoltaic power generation system, it can be divided into two types: independent power supply and grid-connected. According to the waveform modulation method, it can be divided into square wave inverter, step wave inverter, sine wave inverter and combined three-phase inverter.

[0003] After searching, the publication number CN207184341U discloses a solar photovoltaic inverter with a self-heating function, including a main body, a cooling box and a small fan, an operation panel is arranged on the top surface of the main body, a flip cover is arranged on one side of the operation panel, a lock is arranged on one end surface of the flip cover, a connection hole is opened on one side of the bottom of the flip cover, cooling boxes are arranged on both sides of the connection hole, a heat pipe is connected to the inner surface of the cooling box, a small fan is arranged on one side of the heat pipe, a circuit board is arranged on one side of the small fan, a heat dissipation hole is arranged on one side of the circuit board, and a dustproof surface is arranged on the surface of the heat dissipation hole. The utility model can conduct the heat inside the inverter to the cooling box by arranging the heat pipe, and dissipate the heat through the cooling box, and form a heat dissipation airflow inside the inverter by arranging the small fan and placing the small fan opposite to the heat dissipation hole, thereby taking away the heat inside the inverter, and the photovoltaic inverter can effectively dissipate heat and reduce the internal temperature by arranging the above functions.

[0004] In the above scheme, the heat is dissipated through the cooling box, and a small fan is set and placed opposite to the heat dissipation hole to form a heat dissipation airflow inside the inverter, thereby taking away the heat inside the inverter. However, the heat dissipation structure of this inverter is mainly operated manually. In actual use, there is a phenomenon of excessive power loss caused by untimely heat dissipation or long-term operation of the heat dissipation structure, which is contrary to the environmental protection concept of photovoltaic power generation.

[0005] To this end, a small photovoltaic inverter is proposed, which has the advantage of facilitating automatic heat dissipation of the inverter, thereby solving the problems in the above-mentioned background technology. Utility Model Content

[0006] The purpose of the utility model is to solve the shortcomings of the prior art and to propose a small photovoltaic inverter.

[0007] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a small photovoltaic inverter, including a photovoltaic inverter body, a circuit board is installed inside the photovoltaic inverter body, and a temperature sensor is fixedly installed on the top of the photovoltaic inverter body, ventilation nets are respectively embedded and installed on the left and right sides of the photovoltaic inverter body, and an air inlet hood is welded on the ventilation net on the left side of the photovoltaic inverter body, and an exhaust hood is welded on the ventilation net on the right side of the photovoltaic inverter body, a wind cylinder is integrally formed at the left end of the wind inlet hood, and a dust filter is embedded and installed on the end face of the wind cylinder, and a blowing fan is installed inside the wind cylinder, a heat sink is fixed on the back of the photovoltaic inverter body corresponding to the circuit board, and Heat exchange tubes are arranged in the gaps of the heat sink, a cold water tank is arranged below the photovoltaic inverter body, and a water pump is installed inside the cold water tank, an outlet pipe is connected to the air outlet of the water pump, and the outlet pipe is connected to one end of the heat exchange tube, a return pipe is inserted on the right side of the top surface of the cold water tank, and the return pipe is connected to the other end of the heat exchange tube, a semiconductor refrigeration sheet is embedded in the bottom of the cold water tank, and a cooling fan is installed below the semiconductor refrigeration sheet, a PLC controller is fixedly installed on the inner wall of the photovoltaic inverter body, and the output end of the PLC controller is respectively connected to the blowing fan, the semiconductor refrigeration sheet, the cooling fan and the water pump, and the temperature sensor is electrically connected to the PLC controller.

[0008] As a further description of the above technical solution: the cold end of the semiconductor refrigeration plate extends to the inner side of the cold water tank, and the hot end of the semiconductor refrigeration plate faces the cooling fan.

[0009] As a further description of the above technical solution: a hollow disk is welded inside the air duct, and a plurality of fan-shaped vents are opened around the surface of the hollow disk. The blowing fan is arranged on the hollow disk, and the blowing fan is composed of a motor and an impeller fixed at its output end.

[0010] As a further description of the above technical solution: an air outlet is provided on a side of the exhaust hood away from the photovoltaic inverter body.

[0011] As a further description of the above technical solution: two supporting feet are welded to the bottom of the cold water tank, and the heights of the two supporting feet are both greater than the heights of the cooling fan and its mounting bracket.

[0012] As a further description of the above technical solution: circular flanges are respectively provided at both ends of the heat exchange tube, and the heat exchange tube is arranged in a serpentine structure between several gaps of the heat sink.

[0013] As a further description of the above technical solution: the upper surface of the cold water tank is connected to a water inlet nozzle, and the lower surface of the cold water tank is provided with a drain nozzle, and manual valves are installed on the water inlet nozzle and the drain nozzle.

[0014] The utility model has the following beneficial effects:

[0015] In the utility model, an air inlet hood, an air duct, an exhaust hood, a temperature sensor, a cold water tank, a water outlet pipe, a water return pipe, a semiconductor refrigeration sheet, a cooling fan, a heat exchange tube, a water pump, a blowing fan, and a PLC controller are adopted. The temperature inside the inverter is detected by the temperature sensor. When the temperature to be detected exceeds the preset range of the PLC controller, the PLC controller starts the blowing fan, the semiconductor refrigeration sheet, the cooling fan and the water pump. On the one hand, the blowing fan in the air duct introduces the outside air into the photovoltaic inverter body after filtering through a dust filter, and discharges the hot air from the exhaust hood. On the other hand, the water pump introduces the water cooled by the cold end of the semiconductor refrigeration sheet into the heat exchange tube, so that the heat exchange tube arranged in a serpentine structure at the gap between the heat sinks absorbs heat. Compared with the prior art, the method has the advantages of automatic heat dissipation, sufficient heat dissipation and low power loss due to the combination of continuous ventilation and cold water heat exchange. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a front view structural schematic diagram of a small photovoltaic inverter of the utility model;

[0017] Figure 2 This is a schematic diagram of the back view structure of a small photovoltaic inverter of the utility model;

[0018] Figure 3 The utility model is a schematic diagram of the internal structure of a photovoltaic inverter body of a small photovoltaic inverter.

[0019] Legend:

[0020] 1. Photovoltaic inverter body; 2. Air inlet cover; 3. Air duct; 4. Exhaust cover; 5. Temperature sensor; 6. Cold water tank; 7. Water outlet pipe; 8. Water return pipe; 9. Semiconductor refrigeration plate; 10. Cooling fan; 11. Heat exchange tube; 12. Heat sink; 13. Water pump; 14. Hollow plate; 15. Blowing fan; 16. Dust filter; 17. Ventilation net; 18. Circuit board; 19. PLC controller. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] According to an embodiment of the utility model, a small photovoltaic inverter is provided.

[0023] The present invention is now further described in conjunction with the accompanying drawings and specific implementation methods. Figure 1-3 As shown, a small photovoltaic inverter according to an embodiment of the utility model includes a photovoltaic inverter body 1, a circuit board 18 is installed inside the photovoltaic inverter body 1, and a temperature sensor 5 is fixedly installed on the top of the photovoltaic inverter body 1, and ventilation nets 17 are respectively embedded and installed on the left and right sides of the photovoltaic inverter body 1, and an air inlet hood 2 is welded on the ventilation net 17 on the left side of the photovoltaic inverter body 1, and an exhaust hood 4 is welded on the ventilation net 17 on the right side of the photovoltaic inverter body 1, and the left end of the air inlet hood 2 is integrally formed. There is a wind tube 3, and the end surface of the wind tube 3 is embedded with a dust filter 16, and the wind tube 3 is built-in with a blowing fan 15, the back of the photovoltaic inverter body 1 corresponds to the circuit board 18 and is fixed with a heat sink 12, and the gap between the heat sink 12 is arranged with a heat exchange tube 11, a cold water tank 6 is arranged below the photovoltaic inverter body 1, and a water pump 13 is installed inside the cold water tank 6, the air outlet of the water pump 13 is connected with a water outlet pipe 7, and the water outlet pipe 7 is connected to one end of the heat exchange tube 11, and a return water tank 6 is interspersed on the right side of the top surface of the cold water tank 6 Tube 8, and the return pipe 8 is connected with the other end of the heat exchange tube 11, a semiconductor refrigeration sheet 9 is embedded in the bottom of the cold water tank 6, and a cooling fan 10 is installed below the semiconductor refrigeration sheet 9, a PLC controller 19 is fixedly installed on the inner wall of the photovoltaic inverter body 1, and the output end of the PLC controller 19 is respectively connected to the blowing fan 15, the semiconductor refrigeration sheet 9, the cooling fan 10 and the water pump 13, the temperature sensor 5 is electrically connected to the PLC controller 19, the control mode of the utility model is automatically controlled by the PLC controller 19, the control circuit of the PLC controller 19 can be realized by simple programming by technicians in this field, the provision of power is also common knowledge in this field, and the utility model is mainly used to protect mechanical devices, so the utility model will not explain the control mode and circuit connection in detail, the parts not involved in the device are the same as the prior art or can be realized by the prior art, the principle of the photovoltaic inverter is an existing known technology, and there are mature products, so no further explanation of its principle is made;

[0024] In one embodiment, the cold end of the semiconductor refrigeration sheet 9 extends to the inner side of the cold water tank 6, and the hot end of the semiconductor refrigeration sheet 9 faces the cooling fan 10. The cooling fan 10 is configured to cool the hot end of the semiconductor refrigeration sheet 9, thereby ensuring the normal operation of the semiconductor refrigeration sheet 9.

[0025] In one embodiment, a hollow disk 14 is welded inside the air duct 3, and a plurality of fan-shaped vents are opened around the surface of the hollow disk 14. The blowing fan 15 is arranged on the hollow disk 14, and the blowing fan 15 is composed of a motor and an impeller fixed at its output end. The setting of the hollow disk 14 is conducive to ventilation and also provides an installation carrier for the blowing fan 15.

[0026] In one embodiment, an air outlet is provided on a side of the exhaust hood 4 away from the photovoltaic inverter body 1, and the hot air inside the inverter is discharged through the provision of the air outlet to achieve the effect of ventilation and heat dissipation.

[0027] In one embodiment, two supporting feet are welded to the bottom of the cold water tank 6, and the height of the two supporting feet is greater than the height of the cooling fan 10 and its mounting bracket. Through the setting of the supporting feet, installation space is provided for the cooling fan 10 and its mounting bracket.

[0028] In one embodiment, circular flanges are respectively provided at both ends of the heat exchange tube 11, and the heat exchange tube 11 is arranged in a serpentine structure between several gaps of the heat sink 12, so that the heat exchange tube 11 can be connected to the outlet pipe 7 and the return pipe 8 through the setting of the circular flange.

[0029] In one embodiment, the upper surface of the cold water tank 6 is connected to a water inlet, and the lower surface of the cold water tank 6 is provided with a drain. Manual valves are installed on the water inlet and drain. The water inlet and drain are arranged to facilitate the injection and discharge of cold water.

[0030] Working principle:

[0031] When in use, first install the photovoltaic inverter body 1 to a suitable position, then connect the heat exchange tube 11 arranged at the gap between the heat sink 12 and the water outlet pipe 8 and the water outlet pipe 7 of the cold water tank 6, and then connect the power supply of all electrical components of the device. When the photovoltaic inverter body 1 dissipates heat, the internal temperature of the inverter is detected by the temperature sensor 5. When the detected temperature exceeds the preset range of the PLC controller 19, the PLC controller 19 starts the blowing fan 15, the semiconductor refrigeration sheet 9, the cooling fan 10 and the water pump 13. On the one hand, the blowing fan 15 in the wind tube 3 introduces the outside air into the photovoltaic inverter body 1 after filtering it through the dust filter 16, and discharges the hot air from the exhaust hood 4, so as to implement ventilation and heat dissipation for the photovoltaic inverter body 1 and quickly release the hot air. On the other hand, the water pump 13 installed in the cold water tank 6 pumps the water cooled by the cold end of the semiconductor refrigeration plate 9 into the water outlet pipe 8 and introduces it into the heat exchange tube 11, so that the heat exchange tube 11 arranged in a serpentine structure at the gap between the heat sink 12 absorbs the heat, and then the cold water that absorbs the heat flows back to the cold water tank 6 through the return pipe 8, and cooperates with the cooling fan 10 to continuously dissipate the heat from the hot end of the semiconductor refrigeration plate 9 to ensure the normal cooling of the semiconductor refrigeration plate 9 (the semiconductor refrigeration plate 9 is only turned on when the temperature inside the photovoltaic inverter body 1 is abnormal, so it has the effect of low power loss). When the temperature is lower than the preset range of the PLC controller 19, the PLC controller 19 cuts off the power supply of the blowing fan 15, the semiconductor refrigeration plate 9, the cooling fan 10 and the water pump 13.

[0032] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A small photovoltaic inverter, comprising a photovoltaic inverter body (1), characterized in that: The photovoltaic inverter body (1) is internally mounted with a circuit board (18), and a temperature sensor (5) is fixedly inserted on the top of the photovoltaic inverter body (1). The left and right sides of the photovoltaic inverter body (1) are respectively embedded with ventilation nets (17), and an air inlet cover (2) is welded on the ventilation net (17) on the left side of the photovoltaic inverter body (1), and an exhaust cover (4) is welded on the ventilation net (17) on the right side of the photovoltaic inverter body (1). The left end of the air inlet cover (2) is integrally formed with a wind tube (3), and a dust filter net (16) is embedded and installed on the end surface of the wind tube (3), and a blowing fan (15) is installed inside the wind tube (3). A heat sink (12) is fixed on the back of the photovoltaic inverter body (1) corresponding to the circuit board (18), and a heat exchange tube (11) is arranged in the gap between the heat sink (12). The photovoltaic inverter body (1) A cold water tank (6) is arranged below the cold water tank (6), and a water pump (13) is installed inside the cold water tank (6); an outlet of the water pump (13) is connected to a water outlet pipe (7), and the water outlet pipe (7) is connected to one end of the heat exchange pipe (11); a return pipe (8) is inserted on the right side of the top surface of the cold water tank (6), and the return pipe (8) is connected to the other end of the heat exchange pipe (11); a semiconductor cooling plate (9) is embedded in the bottom of the cold water tank (6), and a heat dissipation fan (10) is installed below the semiconductor cooling plate (9); a PLC controller (19) is fixedly installed on the inner wall of the photovoltaic inverter body (1), and the output end of the PLC controller (19) is respectively connected to the blowing fan (15), the semiconductor cooling plate (9), the heat dissipation fan (10) and the water pump (13); the temperature sensor (5) is electrically connected to the PLC controller (19).

2. A small photovoltaic inverter according to claim 1, characterized in that: The cold end of the semiconductor refrigeration sheet (9) extends to the inside of the cold water tank (6), and the hot end of the semiconductor refrigeration sheet (9) faces the heat dissipation fan (10).

3. A small photovoltaic inverter according to claim 1, characterized in that: A hollow disk (14) is welded inside the wind tube (3), and a plurality of fan-shaped ventilation openings are opened around the surface of the hollow disk (14). The blowing fan (15) is arranged on the hollow disk (14), and the blowing fan (15) is composed of a motor and an impeller fixed at its output end.

4. A small photovoltaic inverter according to claim 1, characterized in that: An air outlet is provided on a side of the exhaust hood (4) away from the photovoltaic inverter body (1).

5. A small photovoltaic inverter according to claim 1, characterized in that: Two supporting legs are welded to the bottom of the cold water tank (6), and the heights of the two supporting legs are both greater than the heights of the cooling fan (10) and its mounting bracket.

6. A small photovoltaic inverter according to claim 1, characterized in that: Circular flanges are respectively provided at both ends of the heat exchange tube (11), and the heat exchange tube (11) is arranged in a serpentine structure between a plurality of gaps of the heat sink (12).

7. A small photovoltaic inverter according to claim 1, characterized in that: The upper surface of the cold water tank (6) is connected to a water inlet nozzle, and the lower surface of the cold water tank (6) is provided with a water outlet nozzle, and manual valves are installed on both the water inlet nozzle and the water outlet nozzle.

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