Photovoltaic combiner box inverter capacitor cooling device

Abstract

The utility model discloses a cooling device for a capacitor of an inverter of a photovoltaic combiner box, which relates to the technical field of photovoltaic power generation and comprises a box body, a circuit board arranged in the box body, a capacitor body welded on the circuit board and a copper sleeve sleeved on the capacitor body. The copper sleeve is detachably installed on the surface of the circuit board, the surface of the copper sleeve is fixedly provided with cooling fins, and a plurality of cooling fins are arranged around the copper sleeve in an annular array; and the heat conduction device is arranged on the circuit board. According to the utility model, the capacitor is cooled through the copper sleeve and the cooling fins, and then the heat is led out of the box body through the heat conduction device, so that the heat cannot be accumulated in the box body, and the heat dissipation effect is improved, thereby solving the problems that the temperature of the cooling liquid rises for a long time, the heat absorption capability is gradually lost, and the service life is prolonged. And heat is inconvenient to dissipate out of the box body and still remains in the box body, so that the heat dissipation effect is poor.

Description

Technical Field

[0001] The utility model relates to the technical field of photovoltaic power generation, in particular to a photovoltaic combiner box inverter capacitor cooling device. Background Art

[0002] Photovoltaic combiner boxes are devices used to collect and protect the current in the photovoltaic array and send it to the inverter for power conversion. Photovoltaic inverters can convert the variable DC voltage generated by photovoltaic (PV) solar panels into AC power (AC) at the mains frequency, which can be fed back to the commercial power transmission system or used for off-grid power grids. The function of the capacitor in the inverter is to form an oscillation circuit, generate AC power of a certain frequency, filter out AC power of other frequencies, and prevent clutter.

[0003] For every 10°C increase in capacitor temperature, the life of the electrolytic capacitor is reduced by half. When the electrolytic capacitor is at 105°C, the life is generally 2000-3000 hours, and the longest life is only 5000-6000 hours, which reduces the life of the capacitor and causes sintering of the capacitor surface material. In severe cases, the capacitor burns out and cannot be used any longer, affecting the stability of the inverter under working conditions.

[0004] For example, the patent with announcement number: CN110634673B discloses a photovoltaic combiner box inverter capacitor cooling device. Through the cooperation between the waterproof layer and the silicone sleeve, the heat on the capacitor is transmitted to the waterproof layer in time, so that the expansion liquid expands and contracts adaptively according to the temperature of the capacitor, thereby dripping the cooling liquid on the water storage rod onto the waterproof layer, and then the capacitor temperature is lowered through the waterproof layer, so that the cooling liquid quickly contacts the capacitor and eliminates the high temperature on the capacitor.

[0005] In the prior art, the capacitor temperature is lowered by dripping coolant onto the waterproof layer, but the coolant temperature will rise over time, gradually losing its ability to absorb heat. It is also inconvenient to dissipate the heat out of the box, and the heat will still remain in the box, resulting in poor heat dissipation effect. Utility Model Content

[0006] The utility model provides a photovoltaic combiner box inverter capacitor cooling device, which has the advantages of dissipating heat for the capacitor through a copper sleeve and a heat sink, and then conducting the heat out of the box through a heat conduction device, so that the heat will not accumulate in the box, and the heat dissipation effect is improved, so as to solve the problem that the temperature of the coolant will increase over a long period of time, thereby gradually losing the ability to absorb heat, and it is inconvenient to dissipate the heat outside the box, and the heat will still remain in the box, resulting in poor heat dissipation effect.

[0007] In order to achieve the purpose of dissipating heat to the capacitor through the copper sleeve and the heat sink, and then conducting the heat out of the box body through the heat conduction device, so that the heat will not accumulate in the box body and the heat dissipation effect is improved, the utility model provides the following technical solutions: a photovoltaic combiner box inverter capacitor cooling device, including a box body, a circuit board arranged in the box body and a capacitor body welded on the circuit board, and also including: a copper sleeve sleeved on the capacitor body, the copper sleeve is detachably mounted on the surface of the circuit board, a heat sink is fixedly arranged on the surface of the copper sleeve, and a plurality of heat sinks are arranged in a ring array around the copper sleeve; a heat conduction device is arranged on the circuit board, the capacitor body is arranged inside the heat conduction device, the heat conduction device is connected to the outside of the box body, and the heat conduction device is used to conduct the heat dissipated by the heat sink out of the box body.

[0008] As a preferred technical solution of the utility model, the heat conduction device includes an air deflector, an air inlet pipe and a heat dissipation pipe. The air deflector is detachably arranged on the surface of the circuit board, the capacitor is arranged inside the air deflector, the air inlet pipe is fixedly connected to one end of the air deflector, and the heat dissipation pipe is fixedly connected to the other end of the air deflector. Through holes are opened on both sides of the box body, the air inlet pipe is connected to one of the through holes, and the heat dissipation pipe is connected to the other through hole.

[0009] As a preferred technical solution of the utility model, a cooling fan is fixedly arranged inside the heat dissipation pipe, a temperature sensor is fixedly arranged on the inner wall of the air guide cover, and the temperature sensor is electrically connected to the cooling fan through a controller.

[0010] As a preferred technical solution of the utility model, a filter is detachably provided inside the air inlet pipe, and the filter is arranged at one end of the air inlet pipe away from the air deflector, and the filter is used to filter the air entering the air inlet pipe.

[0011] As a preferred technical solution of the utility model, a grille plate is fixedly provided on the surface of one end of the filter screen away from the air deflector, and the grille plate is used to protect the filter screen.

[0012] As a preferred technical solution of the utility model, a limit frame is fixedly provided on the inner wall of the air inlet duct, the filter screen is connected to the surface of the limit frame, an elastic plate is fixedly provided on the side of the air inlet duct through a groove, the elastic plate is connected to the side of the filter screen, a clamping portion is fixedly provided on one end of the elastic plate, the clamping portion is arranged in an arc shape, and the clamping portion is clamped to the surface of the grille plate.

[0013] As a preferred technical solution of the utility model, a connecting plate is fixedly provided at the bottom of the copper sleeve, the capacitor body passes through the connecting plate, the connecting plate is connected to the surface of the circuit board, the air guide cover is arranged on the surface of the connecting plate, and the sides of the air guide cover and the connecting plate are fixedly provided with multiple orifice plates, and the orifice plates are threadedly connected to the circuit board through fixing screws.

[0014] As a preferred technical solution of the present utility model, a plurality of protrusions are integrally formed on the surface of the heat sink, and the protrusions are used to increase the heat dissipation area of ​​the heat sink.

[0015] Compared with the prior art, the utility model provides a photovoltaic combiner box inverter capacitor cooling device, which has the following beneficial effects:

[0016] 1. The photovoltaic combiner box inverter capacitor cooling device, by arranging a copper sleeve, a heat sink and a heat conducting device, the capacitor body will generate heat when in use, the copper sleeve will absorb the heat of the capacitor body, and then transfer the heat to the heat sink, the heat sink will dissipate the heat of the capacitor body to the heat conducting device, and then discharge it to the outside of the box through the heat conducting device, thereby achieving the advantages of dissipating the heat of the capacitor through the copper sleeve and the heat sink, and then conducting the heat out of the box through the heat conducting device, so that the heat will not accumulate in the box, and the heat dissipation effect is improved, and solves the problem that the temperature of the coolant will rise for a long time, thereby gradually losing the ability to absorb heat, and it is inconvenient to dissipate the heat outside the box, and the heat will still remain in the box, resulting in poor heat dissipation effect.

[0017] 2. The photovoltaic junction box inverter capacitor cooling device is provided with a cooling fan. When the temperature inside the air duct reaches the temperature set by the temperature sensor, the temperature sensor controls the cooling fan to start through the controller, so that a negative pressure is formed inside the air duct, thereby sucking air from the air inlet pipe into the air duct. After entering the air duct, the air passes through the heat sink, then enters the heat pipe, and is finally discharged through the cooling fan, thereby improving the heat dissipation efficiency of the capacitor. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of the utility model;

[0019] Figure 2 This is a schematic diagram of the structure of the capacitor body of the utility model;

[0020] Figure 3 It is a partial structural schematic diagram of the heat conducting device of the utility model;

[0021] Figure 4 This is a schematic diagram of the filter structure of the utility model.

[0022] In the figure: 1. box body; 2. circuit board; 3. capacitor; 4. copper sleeve; 5. heat sink; 6. air guide cover; 7. air inlet pipe; 8. heat dissipation pipe; 9. cooling fan; 10. temperature sensor; 11. filter; 12. grille plate; 13. elastic plate; 14. clamping part; 15. connecting plate; 16. orifice plate; 17. raised part. DETAILED DESCRIPTION

[0023] 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.

[0024] See also Figure 1-Figure 4 The utility model discloses a photovoltaic combiner box inverter capacitor cooling device, including a box body 1, a circuit board 2 arranged in the box body 1 and a capacitor body 3 welded on the circuit board 2, and also includes: a copper sleeve 4 sleeved on the capacitor body 3, the copper sleeve 4 is detachably mounted on the surface of the circuit board 2, a heat sink 5 is fixedly arranged on the surface of the copper sleeve 4, and a plurality of heat sinks 5 are arranged in a ring array around the copper sleeve 4; a heat conducting device arranged on the circuit board 2, the capacitor body 3 is arranged inside the heat conducting device, the heat conducting device is connected to the outside of the box body 1, and the heat conducting device is used to conduct the heat dissipated by the heat sink 5 out of the box body 1.

[0025] Specifically, the heat conduction device includes an air deflector 6, an air inlet pipe 7 and a heat dissipation pipe 8. The air deflector 6 is detachably arranged on the surface of the circuit board 2, the capacitor 3 is arranged inside the air deflector 6, the air inlet pipe 7 is fixedly connected to one end of the air deflector 6, and the heat dissipation pipe 8 is fixedly connected to the other end of the air deflector 6. Through holes are opened on both sides of the box body 1, the air inlet pipe 7 is connected to one of the through holes, and the heat dissipation pipe 8 is connected to the other through hole.

[0026] In this embodiment, the heat sink 5 dissipates the heat of the capacitor 3. The heat sink 5 will discharge the heat into the air duct 6, and then discharge it to the outside of the box 1 through the air inlet pipe 7 and the heat dissipation pipe 8 on the side of the air duct 6, thereby preventing the heat from remaining in the box 1 and affecting other components.

[0027] Specifically, a heat dissipation fan 9 is fixedly disposed inside the heat dissipation pipe 8 , and a temperature sensor 10 is fixedly disposed on the inner wall of the air guide cover 6 . The temperature sensor 10 is electrically connected to the heat dissipation fan 9 through a controller.

[0028] In this embodiment, the temperature sensor 10 will detect the temperature inside the air duct 6. When the temperature inside the air duct 6 reaches the temperature set by the temperature sensor 10, the temperature sensor 10 controls the cooling fan 9 to start through the controller, so that a negative pressure is formed in the air duct 6, thereby sucking air from the air inlet pipe 7 into the air duct 6. After entering the air duct 6, the air will pass through the heat sink 5, and then enter the heat pipe 8, and finally be discharged through the cooling fan 9, thereby improving the heat dissipation efficiency of the capacitor 3.

[0029] Specifically, a filter screen 11 is detachably provided inside the air inlet pipe 7 . The filter screen 11 is provided at one end of the air inlet pipe 7 away from the air guide cover 6 . The filter screen 11 is used to filter the air entering the air inlet pipe 7 .

[0030] In this embodiment, air is sucked into the air guide cover 6 from the air inlet pipe 7, and then the air passes through the filter 11 when entering. The filter 11 can filter the debris in the air, thereby preventing the debris from entering the air guide cover 6 and clogging it.

[0031] Specifically, a grille plate 12 is fixedly provided on the surface of one end of the filter screen 11 away from the air deflector 6 , and the grille plate 12 is used to protect the filter screen 11 .

[0032] In this embodiment, the grid plate 12 is fixed to the outer surface of the filter screen 11, and the grid plate 12 can protect the filter screen 11 from being impacted or scratched.

[0033] Specifically, a limit frame is fixedly provided on the inner wall of the air inlet pipe 7, the filter screen 11 is connected to the surface of the limit frame, an elastic plate 13 is fixedly provided on the side of the air inlet pipe 7 through a groove, the elastic plate 13 is connected to the side of the filter screen 11, and a clamping portion 14 is fixedly provided at one end of the elastic plate 13. The clamping portion 14 is arranged in an arc shape and is clamped to the surface of the grille plate 12.

[0034] In the present embodiment, when the filter 11 is disassembled, the filter 11 is pulled toward the outside of the air inlet duct 7, so that the filter 11 drives the grille plate 12 to squeeze the arc surface of the clamping portion 14, and the clamping portion 14 drives the elastic plate 13 to elastically deform in the direction away from the filter 11, so that the clamping portion 14 is separated from the surface of the grille plate 12, and then the filter 11 is taken out and separated from the clamping portion 14, and the elastic plate 13 is elastically reset to complete the disassembly, so that the filter 11 can be easily cleaned. When the filter 11 is installed, the filter 11 is inserted into the air inlet duct 7, so that the clamping portion 14 drives the elastic plate 13 to elastically deform in the direction away from the filter 11, so that the filter 11 contacts the limit frame, and the elastic plate 13 is elastically reset to drive the clamping portion 14 to fix the filter 11.

[0035] Specifically, a connecting plate 15 is fixedly provided at the bottom of the copper sleeve 4, the capacitor body 3 passes through the connecting plate 15, the connecting plate 15 is connected to the surface of the circuit board 2, the air guide cover 6 is arranged on the surface of the connecting plate 15, and a plurality of orifice plates 16 are fixedly provided on the sides of the air guide cover 6 and the connecting plate 15, and the orifice plates 16 are threadedly connected to the circuit board 2 through fixing screws.

[0036] In this embodiment, the air guide cover 6 is placed on the connecting plate 15, and the orifice plate 16 on the side of the air guide cover 6 is in contact with the orifice plate 16 on the side of the connecting plate 15. Then, the fixing screws are passed through the two connected orifice plates 16, and then the fixing screws are turned to make them threadedly connected with the threaded holes on the circuit board 2, thereby fixing the connecting plate 15 and the air guide cover 6 at the same time.

[0037] Specifically, a plurality of protrusions 17 are integrally formed on the surface of the heat sink 5 , and the protrusions 17 are used to increase the heat dissipation area of ​​the heat sink 5 .

[0038] In this embodiment, a plurality of protrusions 17 are integrally formed on the surface of the heat sink 5 , thereby increasing the heat dissipation surface of the heat sink 5 and achieving a better heat dissipation effect.

[0039] The working principle and use process of the utility model are as follows: when in use, the connecting plate 15 drives multiple copper sleeves 4 to be respectively sleeved on the outside of each capacitor body 3, so that the connecting plate 15 contacts the surface of the circuit board 2, and then the air guide cover 6 is placed on the connecting plate 15, so that the capacitor body 3 is in the air guide cover 6, and at the same time, the air inlet pipe 7 and the heat dissipation pipe 8 on both sides of the air guide cover 6 are respectively connected to the two through holes on the box body 1, and at the same time, the orifice plate 16 on the side of the air guide cover 6 contacts the orifice plate 16 on the side of the connecting plate 15, and then the fixing screws are penetrated through the two connected orifice plates 16 , then tighten the fixing screws to make them threadedly connected with the threaded holes on the circuit board 2, thereby fixing the connecting plate 15 and the air guide cover 6 at the same time. The capacitor 3 will generate heat when in use, and the copper sleeve 4 will absorb the heat of the capacitor 3, and then conduct the heat to the heat sink 5, and the heat sink 5 will dissipate the heat to achieve the heat dissipation of the capacitor 3. The heat sink 5 will discharge the heat into the air guide cover 6, and then discharge it to the outside of the box 1 through the air inlet pipe 7 and the heat dissipation pipe 8 on the side of the air guide cover 6, thereby avoiding the heat remaining in the box 1 to affect other components.

[0040] The temperature sensor 10 will detect the temperature inside the air deflector 6. When the temperature inside the air deflector 6 reaches the temperature set by the temperature sensor 10, the temperature sensor 10 controls the cooling fan 9 to start through the controller, so that a negative pressure is formed in the air deflector 6, thereby sucking air from the through hole on one side of the box body 1 into the air inlet pipe 7, and then flowing into the air deflector 6. After that, the filter 11 can filter the air as it enters. After entering the air deflector 6, the air will pass through the heat sink 5, and then enter the heat pipe 8, and finally be discharged from the through hole on the other side of the box body 1 through the cooling fan 9, so that the air deflector 6 can exchange heat with the outside of the box body 1, accelerate the discharge of heat in the air deflector 6, and then improve the heat dissipation effect on the capacitor body 3.

[0041] In summary, the photovoltaic combiner box inverter capacitor cooling device, by arranging the copper sleeve 4, the heat sink 5 and the heat conducting device, achieves the heat dissipation of the capacitor through the copper sleeve 4 and the heat sink 5, and then conducts the heat out of the box body 1 through the heat conducting device, so that the heat will not accumulate in the box body 1, and the heat dissipation effect is improved. It solves the problem that the temperature of the coolant will increase for a long time, thereby gradually losing the ability to absorb heat, and it is inconvenient to dissipate the heat outside the box body 1, and the heat will still remain in the box body 1, resulting in poor heat dissipation effect.

[0042] It should be noted that, in this article, terms such as "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of more restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0043] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A photovoltaic combiner box inverter capacitor cooling device, comprising a box body (1), a circuit board (2) arranged in the box body (1), and a capacitor body (3) welded on the circuit board (2), characterized in that: Also includes: A copper sleeve (4) sleeved on the capacitor body (3), the copper sleeve (4) being detachably mounted on the surface of the circuit board (2), a heat sink (5) being fixedly arranged on the surface of the copper sleeve (4), and a plurality of the heat sinks (5) being arranged in a ring array around the copper sleeve (4); A heat conducting device is arranged on the circuit board (2), the capacitor (3) is arranged inside the heat conducting device, the heat conducting device is connected to the outside of the box (1), and the heat conducting device is used to conduct heat dissipated by the heat sink (5) out of the box (1).

2. A photovoltaic combiner box inverter capacitor cooling device according to claim 1, characterized in that: The heat conduction device comprises a deflector (6), an air inlet pipe (7) and a heat dissipation pipe (8); the deflector (6) is detachably arranged on the surface of the circuit board (2); the capacitor (3) is arranged inside the deflector (6); the air inlet pipe (7) is fixedly connected to one end of the deflector (6); the heat dissipation pipe (8) is fixedly connected to the other end of the deflector (6); through holes are provided on both sides of the box body (1); the air inlet pipe (7) is connected to one of the through holes, and the heat dissipation pipe (8) is connected to the other through hole.

3. A photovoltaic combiner box inverter capacitor cooling device according to claim 2, characterized in that: A cooling fan (9) is fixedly arranged inside the heat dissipation pipe (8), a temperature sensor (10) is fixedly arranged on the inner wall of the air guide cover (6), and the temperature sensor (10) is electrically connected to the cooling fan (9) via a controller.

4. A photovoltaic combiner box inverter capacitor cooling device according to claim 3, characterized in that: A filter screen (11) is detachably provided inside the air inlet pipe (7), and the filter screen (11) is provided at one end of the air inlet pipe (7) away from the air guide cover (6). The filter screen (11) is used to filter the air entering the air inlet pipe (7).

5. A photovoltaic combiner box inverter capacitor cooling device according to claim 4, characterized in that: A grille plate (12) is fixedly provided on the surface of one end of the filter screen (11) away from the air guide cover (6), and the grille plate (12) is used to protect the filter screen (11).

6. A photovoltaic combiner box inverter capacitor cooling device according to claim 5, characterized in that: A limit frame is fixedly provided on the inner side wall of the air inlet pipe (7), the filter screen (11) is connected to the surface of the limit frame, an elastic plate (13) is fixedly provided on the side of the air inlet pipe (7) via a groove, the elastic plate (13) is connected to the side of the filter screen (11), a clamping portion (14) is fixedly provided at one end of the elastic plate (13), the clamping portion (14) is arranged in an arc shape, and the clamping portion (14) is clamped to the surface of the grille plate (12).

7. A photovoltaic combiner box inverter capacitor cooling device according to claim 2, characterized in that: A connecting plate (15) is fixedly provided at the bottom of the copper sleeve (4), the capacitor body (3) passes through the connecting plate (15), the connecting plate (15) is connected to the surface of the circuit board (2), the air guide cover (6) is provided on the surface of the connecting plate (15), and a plurality of orifice plates (16) are fixedly provided on the sides of the air guide cover (6) and the connecting plate (15), and the orifice plates (16) are threadedly connected to the circuit board (2) via fixing screws.

8. The photovoltaic combiner box inverter capacitor cooling device according to claim 1, characterized in that: A plurality of protrusions (17) are integrally formed on the surface of the heat sink (5), and the protrusions (17) are used to increase the heat dissipation area of ​​the heat sink (5).

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