CN106301006A - A kind of photovoltaic DC-to-AC converter and cooling system thereof - Google Patents

Abstract

The invention discloses a photovoltaic inverter and its heat dissipation system. The heat dissipation system of the photovoltaic inverter includes a cabinet body, and the cabinet body includes an air inlet pipe and an air outlet pipe. Each of the air ducts is provided with a fan, and the side wall of the air outlet duct is provided with an installation position for installing the inverter module of the photovoltaic inverter. The photovoltaic inverter and its heat dissipation system provided by the present invention have good heat dissipation capability and can work continuously and effectively.

Description

A kind of photovoltaic inverter and its cooling system

technical field

The invention relates to the technical field of photovoltaic power generation equipment, in particular to a photovoltaic inverter and a cooling system thereof.

Background technique

The photovoltaic inverter is one of the main components of the photovoltaic power generation system. It is used to convert the direct current generated by photovoltaic power generation into alternating current. The obtained alternating current can be used for independent power supply or integrated into the grid.

Due to the small power generation capacity, the early photovoltaic power generation systems were mostly off-grid and used for independent power supply to meet the electricity demand of users without a network. At this time, the power of the photovoltaic inverter used for photovoltaic power generation is also relatively small . With the development of photovoltaic technology, the amount of photovoltaic power generation continues to increase, and the demand for grid-connected photovoltaic power generation systems begins to increase, and its power requirements for photovoltaic inverters are also increasing.

High-power photovoltaic inverters generally include multiple three-phase inverter modules. When in use, each inverter module will generate a large amount of heat, and the traditional heat dissipation system in the form of heat sinks cannot meet its heat dissipation requirements. However, if the heat dissipation cannot be carried out in a timely and effective manner, the photovoltaic inverter may be overheated and burned, and may even explode, posing a serious safety hazard. On the other hand, the abnormal operation of the photovoltaic inverter caused by overheating will also make it difficult for the photovoltaic power generation system connected to the grid to continue to supply power, affecting the application prospects of photovoltaic power generation.

Therefore, how to provide a photovoltaic inverter that has good heat dissipation capability and can work effectively for a long time is still a technical problem to be solved urgently by those skilled in the art.

Contents of the invention

The object of the present invention is to provide a photovoltaic inverter and its heat dissipation system which has good heat dissipation capability and can work effectively for a long time.

In order to solve the above-mentioned technical problems, the present invention provides a heat dissipation system for photovoltaic inverters, including a cabinet body, the cabinet body includes an air inlet pipe and an air outlet pipe connected to each other, and the air inlet pipe has several mutually independent air outlet pipes. Each of the air ducts is provided with a fan, and the side wall of the air outlet duct is provided with an installation position for installing the inverter module of the photovoltaic inverter.

The heat dissipation system of the photovoltaic inverter provided by the present invention mainly relies on air convection in the air inlet pipe and the air outlet pipe to dissipate heat. During specific work, the heat generated by the inverter module will be transferred to the cabinet body in the form of heat conduction, and the air inlet pipe part of the cabinet body is provided with several air ducts, and fans are installed in each air duct. Next, air convection will be generated inside the cabinet to take away the heat of the cabinet. Compared with the traditional way of relying on heat sinks for heat conduction and heat dissipation, convection heat dissipation can obtain greater heat dissipation efficiency, and the heat dissipation capacity of the photovoltaic inverter has been greatly improved. . And during use, the staff can adjust the power of the fan used as needed, so as to control the heat dissipation rate to adapt to photovoltaic inverters of different power.

In addition, the heat dissipation system of the photovoltaic inverter provided by the present invention is provided with a plurality of mutually independent air passages, and a fan is provided in each air passage. During use, even if a certain fan is damaged, it will not affect the normal operation of the fans in other air ducts. Under the action of other fans, convection heat dissipation can still be carried out inside the cabinet, and the cooling system can still be used. So as to ensure the long-term and effective work of the cooling system.

Optionally, each of the air ducts is provided with a one-way valve, and each of the one-way valves is located between the corresponding fan and the air inlet of the air inlet pipe.

Optionally, a fan drawer is also included, the fan drawer is inserted into the inside of the air inlet pipe along the side wall of the air inlet pipe, each of the one-way valves and each of the fans are arranged in the fan drawer, And the fan drawer has a handle.

Optionally, the fan drawer includes a drawer panel and a drawer bottom plate, the drawer bottom plate is provided with a number of openings matching each air duct, and each of the fans and the one-way valve is disposed in the corresponding opening.

Optionally, the cross-sectional area of the air inlet pipe is larger than the cross-sectional area of the air outlet pipe, and the cabinet further includes a zoom pipe arranged between the air inlet pipe and the air outlet pipe.

Optionally, the air inlet pipe, the air outlet pipe, and the zoom pipe all have coplanar installation side walls, and the installation position is located on the side opposite to the installation side wall of the air outlet pipe. The fan drawer is inserted into the air inlet pipe along the side wall opposite to the installation side wall of the air inlet pipe.

The present invention also provides a photovoltaic inverter, which includes an inverter module and the above-mentioned heat dissipation system, and the inverter module is arranged on the side wall of the air outlet pipe of the heat dissipation system.

Since the heat dissipation system of the above-mentioned photovoltaic inverter already has the above technical effect, the photovoltaic inverter using the heat dissipation system for heat dissipation should also have a similar technical effect, so it will not be repeated here.

Optionally, a cooling fin is further provided between the side wall of the air outlet pipe for installing the inverter module and the inverter module.

Optionally, the center of the inverter module is located on the central axis of the air inlet pipe.

Optionally, the power of the photovoltaic inverter is 250KW-500KW.

Description of drawings

Fig. 1 is a structural schematic diagram of a specific embodiment of the heat dissipation system of the photovoltaic inverter provided by the present invention;

FIG. 2 is a schematic structural view of the cooling system of the photovoltaic inverter in FIG. 1 when the fan drawer is opened.

The reference signs in Figure 1-2 are explained as follows:

1 cabinet body, 11 air inlet pipe, 111 air duct, 12 air outlet pipe, 13 zoom pipe, 2 inverter module, 3 heat sink, 31 mounting plate, 4 fan drawer, 41 handle, 42 fan, 43 one-way valve, 44 drawer fronts, 45 drawer bottoms.

detailed description

In order to enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

The "several" mentioned herein refers to a plurality with an indeterminate number, usually more than two.

Please refer to Fig. 1 and Fig. 2, Fig. 1 is a structural schematic diagram of a specific embodiment of the heat dissipation system of the photovoltaic inverter provided by the present invention, and Fig. 2 is the fan drawer of the heat dissipation system of the photovoltaic inverter in Fig. 1 Schematic diagram of the structure when opened.

As shown in FIG. 1 and FIG. 2 , the present invention provides a cooling system for a photovoltaic inverter, which includes a cabinet body 1 , and the cabinet body 1 includes an air inlet pipe 11 and an air outlet pipe 12 that communicate with each other. The inside of the air inlet pipe 11 has several mutually independent air ducts 111, and each air duct 111 is provided with a fan 42, and the side wall of the air outlet duct 12 is provided with a mounting position for the inverter module 2 of the photovoltaic inverter. .

The heat dissipation system of the photovoltaic inverter provided by the present invention mainly relies on air convection in the air inlet pipe 11 and the air outlet pipe 12 to dissipate heat. During specific work, the heat generated by the inverter module 2 will be transferred to the cabinet body 1 in the form of heat conduction, and the air inlet duct 11 of the cabinet body 1 is provided with several air ducts 111, and each air duct 111 is provided with Fans 42, under the action of each fan 42, air convection will be generated inside the cabinet body 1 to take away the heat of the cabinet body 1. Compared with the traditional heat dissipation method relying on heat sink 3 for heat radiation, convection heat dissipation can obtain greater Heat dissipation efficiency, the heat dissipation capacity of the photovoltaic inverter has been greatly improved.

During specific implementation, those skilled in the art can adjust the power of the fans 42 used in each air duct 111 as needed, so as to adapt to photovoltaic inverters with different powers. The power of the fans 42 in each air duct 111 can be all the same, or there can be certain differences. Each fan 42 can be set to a different gear, so that the staff can adjust the air flow rate in the cabinet 1 in real time, and then control the heat dissipation efficiency. .

In addition, in the heat dissipation system of the photovoltaic inverter provided by the present invention, several air ducts 111 are independent of each other, and fans 42 are arranged in each air duct 111 . During use, even if a certain fan 42 is damaged, it will not affect the normal operation of the fans 42 in other air ducts 111. Under the action of other fans 42, convection heat dissipation can still be performed inside the cabinet body 1. The heat dissipation The system can still be used continuously, thereby ensuring the long-term and effective work of the cooling system. And during use, one or more fans 42 can also be actively turned off to adjust the convection heat dissipation efficiency and enhance the controllability and adaptability of the heat dissipation system.

Further, each air duct 111 may be provided with a one-way valve 43 , and each one-way valve 43 is located between the corresponding fan 42 and the air inlet of the air inlet pipe 11 . The setting of the above-mentioned one-way valve 43 makes the gas only enter the interior of the cabinet body 1 through the air ducts 111, but cannot go out from the air ducts 111, thereby ensuring the airtightness of the interior of the cabinet body 1 and the efficiency of convection heat dissipation. Especially when a certain fan 42 is damaged or needs to be closed, although the air duct 111 corresponding to the fan 42 cannot deliver gas to the cabinet body 1, under the action of the check valve 43, the gas in the cabinet body 1 will also It will not leak from the air duct 111, avoiding the occurrence of air leakage and ensuring the stability of the cooling system.

It should be understood that the greater the number of the above-mentioned air ducts 111, the greater the air volume that can be generated in the cabinet body 1, and the better the heat dissipation effect. However, the increase in the number of air ducts 111 will also increase the complexity of the structure of the air inlet pipe 11 , which will greatly increase the manufacturing cost of the entire cabinet 1 . Considering the heat dissipation effect and the cost, the number of the air ducts 111 in the air inlet pipe 11 is preferably two.

As shown in Figure 2, the heat dissipation system of the photovoltaic inverter provided by the present invention can also include a fan drawer 4, which is inserted into the inside of the air inlet pipe 11 along the side wall of the air inlet pipe 11, and each unidirectional The valve 43 and each fan 42 are both arranged in the fan drawer 4 , and the fan drawer 4 may also be provided with a handle 41 . With this structure, each fan 42 and one-way valve 43 are accommodated in the fan drawer 4, so that the structure of the air inlet duct 11 is more compact; When performing maintenance, the fan drawer 4 can be pulled out directly, and each component can be inspected and maintained conveniently, which greatly improves the efficiency of equipment maintenance and replacement.

Still referring to FIG. 2 , the above-mentioned fan drawer 4 includes a drawer panel 44 and a drawer bottom plate 45. The drawer bottom plate 45 is provided with a number of openings. Both the fans 42 and the one-way valve 43 are disposed on the corresponding openings. When the fan drawer 4 is in the closed state, each fan 42 and the one-way valve 43 are located in the corresponding air duct 111 .

Further, the cross-sectional area of the air inlet pipe 11 is larger than the cross-sectional area of the air outlet pipe 12 , and a zoom pipe 13 is also provided between the air inlet pipe 11 and the air outlet pipe 12 . Because the total amount of the gas sucked in by the air inlet pipe 11 and the gas discharged by the air outlet pipe 12 is constant, the cross-sectional area of the air outlet pipe 12 is smaller than the cross-sectional area of the air inlet pipe 11, so that the gas at the air outlet pipe 12 The flow velocity is greater than the flow velocity of the gas at the air inlet pipe 11, which is more conducive to taking away the heat generated by the inverter module 2. It should be understood that the above-mentioned cross section refers to a section perpendicular to the axial direction of the air inlet pipe 11 or the air outlet pipe 12 .

The air inlet pipe 11 , the air outlet pipe 12 and the zoom pipe 13 all have coplanar installation sidewalls. From the perspective of FIG. 2 , the installation sidewall is the left sidewall of the cabinet body 1 . In actual use, the coplanar installation side walls can be used to install and fix the heat dissipation system, which makes the installation more convenient.

The inverter module 2 of the photovoltaic inverter is arranged on the side wall opposite to the installation side wall of the air outlet duct 12 (right side wall in FIG. 2 ), and the fan drawer 4 is arranged on the side opposite to the installation side wall of the air inlet duct 11. The wall (the right side wall in FIG. 2 ) is inserted into the air inlet pipe 11 . In this way, the installation of the fan drawer 4 and the inverter module 2 will not interfere with the installation and fixation of the cabinet body 1 , and it is also convenient to open and close the fan drawer 4 .

The present invention also provides a photovoltaic inverter, including an inverter module 2 and the aforementioned heat dissipation system, and the inverter module 2 is arranged on the side wall of the air outlet pipe 12 of the heat dissipation system. Since the photovoltaic inverter provided by the present invention mainly utilizes the aforementioned cooling system for heat dissipation, and the aforementioned technical effect of the cooling system, the photovoltaic inverter provided by the present invention will also have similar technical effects, so it will not be discussed here. Do repeat.

The photovoltaic inverter provided by the present invention also includes a cooling fin 3. From the perspective of FIG. A mounting plate 31 is also provided between the side walls of the air outlet pipe 12 to facilitate the installation of the heat sink 3 on the side walls of the air outlet pipe 12 . In specific use, the heat generated by the inverter module 2 is transferred to the heat sink 3 in the form of heat conduction, and the heat sink 3 transfers part of the heat to the surrounding air in the form of heat radiation, and the other part is transferred to the surrounding air in the form of heat conduction. Install the plate 31 and the cabinet body 1, and then take away this part of heat through air convection. The photovoltaic inverter provided by the present invention comprehensively uses three heat dissipation methods of heat radiation, heat conduction and convective heat dissipation, thereby greatly improving the heat dissipation efficiency of the photovoltaic inverter. Correspondingly, the power of the photovoltaic inverter can also be greatly increased, and the power of the photovoltaic inverter provided by the present invention can be set to 250KW-500KW through test verification.

Generally, when the photovoltaic inverter provided by the present invention is installed and used, the opening of the air inlet pipe 11 faces downward, while the opening of the air outlet pipe 12 faces upward. After the installation is completed, the center of the inverter module 2 can be Located on the central axis of the air inlet pipe 11. In this way, the stability of the entire photovoltaic inverter is better, and the lateral area of the entire photovoltaic inverter is relatively small, and the structure is more compact.

The above are only preferred embodiments of the present invention, and it should be pointed out that for those of ordinary skill in the art, some improvements and modifications can also be made without departing from the principle of the present invention, and these improvements and modifications should also be considered Be the protection scope of the present invention.

Claims (10)

1. A cooling system for a photovoltaic inverter, characterized in that it comprises a cabinet (1), and the cabinet (1) includes an air inlet pipe (11) and an air outlet pipe (12) connected to each other, the The air inlet pipe (11) has several mutually independent air ducts (111), and fans (42) are all provided in each of the air ducts (111), and the side walls of the air outlet ducts (12) are provided with Describe the installation position of the inverter module (2) of the photovoltaic inverter. 2. The heat dissipation system of the photovoltaic inverter according to claim 1, characterized in that, each of the air ducts (111) is provided with a one-way valve (43), and each of the one-way valves (43) It is located between the corresponding fan (42) and the air inlet of the air inlet pipe (11). 3. The heat dissipation system of the photovoltaic inverter according to claim 2, further comprising a fan drawer (4), the fan drawer (4) inserted into the side wall of the air inlet pipe (11) Inside the air inlet pipe (11), each check valve (43) and each fan (42) are arranged in the fan drawer (4), and the fan drawer (4) has a handle (41 ). 4. The cooling system of the photovoltaic inverter according to claim 3, characterized in that, the fan drawer (4) comprises a drawer panel (44) and a drawer bottom plate (45), and the drawer bottom plate (45) is provided with There are several openings matched with each air duct (111), and each of the fans (42) and the one-way valve (43) is arranged in the corresponding opening. 5. The heat dissipation system of a photovoltaic inverter according to any one of claims 1-4, characterized in that, the cross-sectional area of the air inlet pipe (11) is larger than that of the air outlet pipe (12) The area of the cross section, the cabinet (1) also includes a zoom pipe (13) arranged between the air inlet pipe (11) and the air outlet pipe (12). 6. The heat dissipation system of the photovoltaic inverter according to claim 5, characterized in that, the air inlet pipe (11), the air outlet pipe (12) and the zoom pipe (13) all have coplanar The installation side wall, the installation position is located on the side wall opposite to the installation side wall of the air outlet pipe (12), the fan drawer (4) is along the side wall of the air inlet pipe (11) The side wall opposite to the installation side wall is inserted into the air inlet pipe (11). 7. A photovoltaic inverter, comprising an inverter module (2), characterized in that it also includes the heat dissipation system according to any one of claims 1-6, the inverter module (2) is located in the Describe the side wall of air duct (12). 8. The photovoltaic inverter according to claim 7, characterized in that, the side wall of the air outlet pipe (12) for installing the inverter module (2) is in contact with the inverter module (2) Radiating fins (3) are also arranged between them. 9. The photovoltaic inverter according to claim 8, characterized in that, the center of the inverter module (2) is located on the central axis of the air inlet pipe (11). 10. The photovoltaic inverter according to claim 8, characterized in that, the power of the photovoltaic inverter is 250KW-500KW.