Heat dissipation system of photovoltaic inverter

Abstract

The utility model discloses a heat dissipation system of a photovoltaic inverter, which comprises an inverter box body, the inverter box body comprises a box body internal space and a box body external space which are completely closed, and an internal heating device, a power module, an internal fan and an evaporator of a thermosyphon heat exchanger are accommodated in the box body internal space; a radiator, a condenser of the thermosyphon heat exchanger, a power inductor and an external fan are arranged in the external space of the box body, the internal heating device comprises a first internal heating device and a second internal heating device, and an evaporator of the thermosyphon heat exchanger is connected with the condenser of the thermosyphon heat exchanger through a pipeline; the pipeline penetrates through a component for separating the internal space of the box body from the external space of the box body and is sealed; according to the heat dissipation system, directional heat transfer is achieved through the thermosyphon principle, heat in the case is transferred to the external environment, the environment temperature in the case can be effectively reduced, meanwhile, protection of the IP66 protection level is achieved in the case, and the occupied size of the heat dissipation system in the case is obviously reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of heat dissipation, in particular to a heat dissipation system for a photovoltaic inverter. Background Art

[0002] At present, the heat dissipation method of high-power inverters usually adopts forced air cooling. The losses of the whole machine mainly come from the power modules on the machine side and the grid side, and the heat of magnetic devices such as inductors on the machine side and the grid side and the capacitance inductance inside the chassis. The inductors and power modules usually adopt aluminum radiators and fans for forced air cooling heat exchange. However, since the box of the photovoltaic inverter usually needs to meet the protection level of IP66 or above, it is very difficult for the heat of the internal devices of the chassis to be directly transferred to the outside of the chassis through mass exchange. The heat of the internal devices is usually transferred to the chassis shell by a turbulent flow fan, and then the shell transfers the heat to the external environment through natural heat dissipation and thermal radiation. The heat carried away only by the turbulent flow of the internal fan and the natural heat dissipation of the chassis is very limited. Especially after the power reaches a certain level, it is necessary to introduce an additional external device to reduce the internal loop temperature of the inverter. However, if an additional external device is introduced, due to the influence of the external device, it will not be possible to achieve the protection level of IP66, nor can efficient heat exchange be carried out, and the volume of the chassis occupied by it will increase significantly. Summary of the Utility Model

[0003] The technical problem to be solved by the utility model is to provide a heat dissipation system for a photovoltaic inverter. The heat dissipation system of the photovoltaic inverter utilizes the principle of thermosiphon to realize the directional transfer of heat, transfers the heat inside the chassis to the external environment, can effectively reduce the environmental temperature inside the chassis, improve the service life of components, and at the same time achieve the protection level of IP66 for the inside of the chassis, and the volume of the chassis occupied by it is significantly reduced.

[0004] To solve the above technical problem, the utility model provides a heat dissipation system for a photovoltaic inverter, including an inverter box body. The inverter box body includes a completely sealed internal space of the box body and an external space of the box body. The internal space of the box body accommodates internal heat generating devices, power modules, internal fans, and an evaporator of a thermosiphon heat exchanger. A radiator, a condenser of a thermosiphon heat exchanger, a power inductor, and an external fan are arranged in the external space of the box body. The internal heat generating devices include a first internal heat generating device and a second internal heat generating device. The evaporator of the thermosiphon heat exchanger and the condenser of the thermosiphon heat exchanger are connected by a pipeline, and the pipeline passes through the component separating the internal space of the box body and the external space of the box body and is sealed at the place where it passes through.

[0005] The internal fans include a first internal fan and a second internal fan. The first internal fan, the first internal heat generating device, the evaporator of the thermosiphon heat exchanger, the second internal fan, and the second internal heat generating device form an internal circulation air duct.

[0006] The external fan, radiator, power inductor, and the condenser of the thermosyphon heat exchanger form an external circulation air duct.

[0007] Preferably, the first internal heat generating device includes a relay and a filter inductor, and the second internal heat generating device includes an electrolytic capacitor.

[0008] Preferably, the first internal heat generating device is disposed between the inlet of the first internal fan and the evaporator of the thermosyphon heat exchanger; the second internal fan is disposed near the outlet of the evaporator of the thermosyphon heat exchanger, and a wind guiding cavity is provided between the second internal fan and the outlet of the evaporator of the thermosyphon heat exchanger, and the second heat generating device is disposed in front of the outlet of the second internal fan.

[0009] Preferably, the power module is mounted on the radiator, the radiator passes through the member separating the internal space and the external space of the box body and is sealed at the passing-through member, and the external fan is disposed below the condenser of the thermosyphon heat exchanger, the radiator, and the power inductor.

[0010] Preferably, the power inductor includes an inverter inductor and a boost inductor.

[0011] Preferably, the condenser of the thermosyphon heat exchanger and the evaporator of the thermosyphon heat exchanger form a thermosyphon heat exchanger, and the thermosyphon heat exchanger is fixed to the inverter box body by a structural member.

[0012] Preferably, the condenser of the thermosyphon heat exchanger is subjected to anodic oxidation surface treatment, electrophoretic surface treatment, or spraying surface treatment.

[0013] Preferably, the condenser of the thermosyphon heat exchanger includes a second gas collecting chamber, a second liquid collecting chamber, and a plurality of microchannel flat tubes connecting the second gas collecting chamber and the second liquid collecting chamber, and the evaporator of the thermosyphon heat exchanger includes a first gas collecting chamber, a first liquid collecting chamber, and a plurality of microchannel flat tubes connecting the first gas collecting chamber and the first liquid collecting chamber; the condenser of the thermosyphon heat exchanger is connected to the evaporator of the thermosyphon heat exchanger through an air pipe and a liquid pipe, and the air pipe and the liquid pipe pass through the member separating the internal space and the external space of the box body.

[0014] Preferably, the plane where the evaporator of the thermosyphon heat exchanger is located and the plane where the condenser of the thermosyphon heat exchanger is located form an included angle, the external fans are multiple, the external space of the box body is separated into a first space and a second space by a wind guiding plate, the first external fan and the condenser of the thermosyphon heat exchanger are disposed in the first space, and the second external fan, the power inductor, and the radiator are disposed in the second space, where n≥2.

[0015] Preferably, the plane where the evaporator of the thermosyphon heat exchanger is located and the plane where the condenser of the thermosyphon heat exchanger is located are parallel to each other. A wind guiding cavity is provided at the air inlet of the evaporator of the thermosyphon heat exchanger. The second internal fan is arranged close to the air outlet of the evaporator of the thermosyphon heat exchanger. First wind guiding plates and second wind guiding plates are arranged at the upper and lower parts of the condenser of the thermosyphon heat exchanger. The external space of the box body is divided into a first space and a second space by the first wind guiding plate, the condenser of the thermosyphon heat exchanger, and the second wind guiding plate. The first external fan is arranged in the first space, and the second external fan, the third external fan... the nth external fan, the power inductor and the radiator are arranged in the second space, where n≥2.

[0016] After adopting the above system, the heat dissipation system of the photovoltaic inverter includes an inverter box body, and the inverter box body includes a completely enclosed internal space and an external space of the box body. The internal space of the box body accommodates internal heat generating components, power modules, internal fans, and the evaporator of the thermosyphon heat exchanger; the external space of the box body is provided with a radiator, the condenser of the thermosyphon heat exchanger, a power inductor and an external fan. The internal heat generating components include a first internal heat generating component and a second internal heat generating component. The evaporator of the thermosyphon heat exchanger and the condenser of the thermosyphon heat exchanger are connected by a pipeline, and the pipeline passes through the component separating the internal space and the external space of the box body and is sealed at the joint; the internal fans include a first internal fan and a second internal fan, and the first internal fan, the first internal heat generating component, the evaporator of the thermosyphon heat exchanger, the second internal fan and the second internal heat generating component form an internal circulation air duct;

[0017] The external fan, the radiator, the power inductor and the condenser of the thermosyphon heat exchanger form an external circulation air duct; the heat dissipation system of the photovoltaic inverter utilizes the thermosyphon principle to realize the directional transfer of heat, transfers the heat inside the chassis to the external environment, can effectively reduce the environmental temperature inside the chassis, improve the service life of components, and at the same time achieve the protection of IP66 protection level for the inside of the chassis, and the volume it occupies in the chassis is significantly reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a side view of a heat dissipation system of a photovoltaic inverter of the present invention;

[0019] Figure 2 It is the structure of the thermosyphon heat exchanger of the heat dissipation system of the photovoltaic inverter of the present invention Figure 1 ;

[0020] Figure 3 It is the front view of the heat dissipation system of the photovoltaic inverter of the present invention Figure 1 ;

[0021] Figure 4Rear view of the heat dissipation system of the photovoltaic inverter of the present utility model Figure 1 ;

[0022] Figure 5 Structure of the thermosyphon heat exchanger of the heat dissipation system of the photovoltaic inverter of the present utility model Figure 2 ;

[0023] Figure 6 Front view of the heat dissipation system of the photovoltaic inverter of the present utility model Figure 2 ;

[0024] Figure 7 Rear view of the heat dissipation system of the photovoltaic inverter of the present utility model Figure 2 。 Specific embodiments

[0025] In order to make the objectives, technical solutions and advantages of the present utility model clearer and more understandable, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model. Embodiment 1

[0026] Please refer to Figure 1 and Figure 2 , Figure 1 which is a side view of a heat dissipation system of a photovoltaic inverter of the present utility model;

[0027] This embodiment discloses a heat dissipation system of a photovoltaic inverter, including an inverter box body. The inverter box body includes a completely enclosed internal space 10 of the box body and an external space 20 of the box body. The internal space 10 of the box body accommodates internal heat generating devices 51, a power module 53, an internal fan, and an evaporator 21 of a thermosyphon heat exchanger; the external space 20 of the box body is provided with a radiator 6, a condenser 22 of the thermosyphon heat exchanger, a power inductor, and an external fan 33. The internal heat generating devices include a first internal heat generating device and a second internal heat generating device. The evaporator 21 of the thermosyphon heat exchanger and the condenser 22 of the thermosyphon heat exchanger are connected by a pipeline, and the pipeline passes through the component separating the internal space 10 of the box body and the external space 20 of the box body and is sealed at the place where it passes through the component;

[0028] The internal fan includes a first internal fan 31 and a second internal fan 32. The first internal fan 31, the first internal heat generating device, the evaporator 21 of the thermosyphon heat exchanger, the second internal fan 32, and the second internal heat generating device form an internal circulation air duct;

[0029] The external fan 33, the radiator 6, the power inductor, and the condenser 22 of the thermosyphon heat exchanger form an external circulation air duct. Embodiment 2

[0030] Please refer to Figure 3, Figure 3 is the front view of the heat dissipation system of the photovoltaic inverter of the present utility model Figure 1 ;

[0031] This embodiment is based on Embodiment 1. In this embodiment,

[0032] the first internal heat generating device includes a relay 511 and a filter inductor 512, and the second internal heat generating device includes an electrolytic capacitor 52.

[0033] The first internal heat generating device is arranged between the first internal fan 31 and the air inlet 25 of the evaporator 21 of the heat pipe heat exchanger; the second internal fan 32 is arranged close to the air outlet 26 of the evaporator 21 of the heat pipe heat exchanger, and a wind guiding cavity 41 is arranged between the second internal fan 32 and the air outlet 26 of the evaporator 21 of the heat pipe heat exchanger, and the second heat generating device is arranged in front of the air outlet 26 of the second internal fan 32.

[0034] The power module 53 is installed on the radiator 6. The radiator 6 passes through the component separating the internal space 10 and the external space 20 of the box body and is sealed at the passing position. The external fan 33 is arranged below the condenser 22 of the heat pipe heat exchanger, the radiator 6 and the power inductor. Embodiment 3

[0035] This embodiment is based on Embodiment 1. In this embodiment, the power inductor includes an inverter inductor 72 and a boost inductor 71. Embodiment 4

[0036] Please refer to Figure 2 , Figure 2 which is the overall structure of the heat dissipation system of the photovoltaic inverter of the present utility model Figure 1 ;

[0037] This embodiment is based on Embodiment 1. In this embodiment, the condenser 22 of the heat pipe heat exchanger and the evaporator 21 of the heat pipe heat exchanger form a heat pipe heat exchanger, and the heat pipe heat exchanger is fixed on the inverter box body through a structural member 29.

[0038] The condenser 22 of the heat pipe heat exchanger is subjected to anodic oxidation surface treatment or electrophoretic surface treatment or spraying surface treatment.

[0039] The condenser 22 of the thermosyphon heat exchanger includes a second gas collecting chamber 222, a second liquid collecting chamber 223, and a plurality of microchannel flat tubes 221 connecting the second gas collecting chamber 222 and the second liquid collecting chamber 223. The evaporator 21 of the thermosyphon heat exchanger includes a first gas collecting chamber 212, a first liquid collecting chamber 213, and a plurality of microchannel flat tubes 211 connecting the first gas collecting chamber 212 and the first liquid collecting chamber 213. The condenser 22 of the thermosyphon heat exchanger is connected to the evaporator 21 of the thermosyphon heat exchanger through an air pipe 23 and a liquid pipe 24, and the air pipe 23 and the liquid pipe 24 pass through a member separating the internal space 10 of the box body and the external space 20 of the box body. Embodiment 5

[0040] Please refer to Figure 2 and Figure 4 , Figure 2 which is the overall structure of the photovoltaic inverter cooling system of the present utility model Figure 1 , Figure 4 which is the rear view of the photovoltaic inverter cooling system of the present utility model Figure 1 ;

[0041] Based on Embodiment 1, in this embodiment, the plane where the evaporator 21 of the thermosyphon heat exchanger is located and the plane where the condenser 22 of the thermosyphon heat exchanger is located form a certain included angle. The external fans are n in number, and the external space 20 of the box body is separated into a first space and a second space by a wind guiding plate 42. The first external fan and the condenser 22 of the thermosyphon heat exchanger are arranged in the first space, and the second external fan, the third external fan... the nth external fan, the power inductor and the radiator are arranged in the second space, where n≥2. Embodiment 6

[0042] Please refer to Figure 5 , Figure 6 and Fig. 7, Figure 5 which is the structure of the thermosyphon heat exchanger of the photovoltaic inverter cooling system of the present utility model Figure 2 , Figure 6 which is the front view of the photovoltaic inverter cooling system of the present utility model Figure 2 , Figure 7 which is the rear view of the photovoltaic inverter cooling system of the present utility model Figure 2 ;

[0043] Based on Embodiment 1, in this embodiment,

[0044] The plane where the evaporator 21 of the thermosyphon heat exchanger is located and the plane where the condenser 22 of the thermosyphon heat exchanger is located are parallel to each other. A wind guiding cavity 41 is arranged at the air inlet of the evaporator 21 of the thermosyphon heat exchanger. The second internal fan 32 is arranged close to the air outlet of the evaporator 21 of the thermosyphon heat exchanger. The upper and lower parts of the condenser 22 of the thermosyphon heat exchanger are provided with a first wind guiding plate 421 and a second wind guiding plate 422. The number of the external fans is n. The external space 20 of the box body is divided into a first space and a second space by the first wind guiding plate 421, the condenser 22 of the thermosyphon heat exchanger, and the second wind guiding plate 422. The first external fan is arranged in the first space, and the second external fan, the third external fan... the nth external fan, the power inductor and the radiator 6 are arranged in the second space, where n≥2.

[0045] The heat dissipation system of this photovoltaic inverter utilizes the thermosyphon principle to achieve the directional transfer of heat, transferring the heat inside the chassis to the external environment, which can effectively reduce the internal environmental temperature of the chassis, improve the service life of components, and at the same time achieve the protection of IP66 protection level for the inside of the chassis, and the volume it occupies in the chassis is significantly reduced.

[0046] It should be understood that the above are only the preferred embodiments of the present invention, and the patent scope of the present invention cannot be limited thereby. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied to other related technical fields, shall be similarly included in the patent protection scope of the present invention.

Claims

1. A heat dissipation system for a photovoltaic inverter, characterized in that: The inverter case includes a completely sealed case internal space and a case external space, wherein the case internal space contains internal heating devices, a power module, an internal fan, and an evaporator of a thermosyphon heat exchanger; the case external space is provided with a radiator, a condenser of the thermosyphon heat exchanger, a power inductor, and an external fan, wherein the internal heating devices include a first internal heating device and a second internal heating device, wherein the evaporator of the thermosyphon heat exchanger and the condenser of the thermosyphon heat exchanger are connected via a pipeline, wherein the pipeline passes through a component separating the case internal space and the case external space and is sealed at the passing component; The internal fan comprises a first internal fan and a second internal fan, wherein the first internal fan, the first internal heating device, the evaporator of the thermosyphon heat exchanger, the second internal fan and the second internal heating device form an internal circulation air duct; The external fan, the radiator, the power inductor and the condenser of the thermosyphon heat exchanger form an external circulation air duct.

2. The heat dissipation system of the photovoltaic inverter according to claim 1, characterized in that: The first internal heating device includes a relay and a filter inductor, and the second internal heating device includes an electrolytic capacitor.

3. The heat dissipation system of the photovoltaic inverter according to claim 1, characterized in that: The first internal heating device is arranged between the first internal fan and the air inlet of the evaporator of the thermal syphon heat exchanger; the second internal fan is arranged close to the air outlet of the evaporator of the thermal syphon heat exchanger, and an air guide cavity is arranged between the second internal fan and the air outlet of the evaporator of the thermal syphon heat exchanger, and the second heating device is arranged in front of the air outlet of the second internal fan.

4. The heat dissipation system of the photovoltaic inverter according to claim 1, characterized in that: The power module is mounted on a radiator, which passes through a component separating an internal space of a box and an external space of the box and is sealed at the point where the component is passed through. The external fan is arranged below the condenser, radiator and power inductor of the thermosyphon heat exchanger.

5. The heat dissipation system of the photovoltaic inverter according to claim 1, characterized in that: The power inductor includes an inverter inductor and a boost inductor.

6. The heat dissipation system of the photovoltaic inverter according to claim 1, characterized in that: The condenser of the thermosyphon heat exchanger and the evaporator of the thermosyphon heat exchanger form a thermosyphon heat exchanger, and the thermosyphon heat exchanger is fixed on the inverter box through a structural member.

7. The heat dissipation system of the photovoltaic inverter according to claim 1, characterized in that: The condenser of the thermosyphon heat exchanger is subjected to anodizing surface treatment, electrophoresis surface treatment or spraying surface treatment.

8. The heat dissipation system of the photovoltaic inverter according to claim 1, characterized in that: The condenser of the thermal syphon heat exchanger includes a second air collecting chamber, a second liquid collecting chamber, and a plurality of microchannel flat tubes connecting the second air collecting chamber and the second liquid collecting chamber; the evaporator of the thermal syphon heat exchanger includes a first air collecting chamber, a first liquid collecting chamber, and a plurality of microchannel flat tubes connecting the first air collecting chamber and the first liquid collecting chamber; the condenser of the thermal syphon heat exchanger is connected to the evaporator of the thermal syphon heat exchanger through an air pipe and a liquid pipe, and the air pipe and the liquid pipe pass through the component that separates the internal space of the box and the external space of the box.

9. The heat dissipation system of the photovoltaic inverter according to claim 1, characterized in that: The plane where the evaporator of the thermal syphon heat exchanger is located and the plane where the condenser of the thermal syphon heat exchanger is located form an angle of a certain angle, there are n external fans, and the external space of the box is divided into a first space and a second space by an air guide plate. The first external fan and the condenser of the thermal syphon heat exchanger are arranged in the first space, and the second external fan, the third external fan...the nth external fan, the power inductor and the radiator are arranged in the second space, wherein n≥2.

10. The heat dissipation system of the photovoltaic inverter according to claim 1, characterized in that: The plane where the evaporator of the thermal syphon heat exchanger is located and the plane where the condenser of the thermal syphon heat exchanger is located are parallel to each other, the air inlet of the evaporator of the thermal syphon heat exchanger is provided with an air guide cavity, the second internal fan is provided close to the air outlet of the evaporator of the thermal syphon heat exchanger, the upper and lower parts of the condenser of the thermal syphon heat exchanger are provided with a first air guide plate and a second air guide plate, the external space of the box body is divided into a first space and a second space by the first air guide plate, the condenser of the thermal syphon heat exchanger and the second air guide plate, the first external fan is provided in the first space, the second external fan, the third external fan...the nth external fan, the power inductor and the radiator are provided in the second space, wherein n≥2.

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