Heat dissipation structure and photovoltaic grid-connected inverter comprising same
By introducing a cooling fan and a phase change condenser into the photovoltaic grid-connected inverter, a compact three-dimensional phase change circulation system is constructed, which solves the problem of high thermal resistance of the heat sink in the existing photovoltaic grid-connected inverter, achieves efficient heat dissipation, and meets the needs of high-power products.
Patent Information
- Application Number
- CN202520111406.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-16
- Publication Date
- 2026-01-30
- Estimated Expiration
- 2035-01-16
AI Technical Summary
Existing photovoltaic grid-connected inverters have high thermal resistance and limited heat dissipation capacity, making it difficult to meet the heat dissipation requirements of high-power products. Furthermore, conventional toothed heat sinks are difficult to customize, resulting in cost waste and deterioration of the heat source heat dissipation environment.
By using cooling fans between adjacent radiators to guide airflow, combined with a phase change condenser and a three-dimensional spatial phase change circulation system, and taking advantage of the strong heat transfer capacity of the phase change, a compact heat dissipation structure is constructed to achieve rapid heat transfer and a significant improvement in heat dissipation effect.
By increasing the airflow velocity in the decoupled dual-row heat source area and applying a phase change condenser, the heat dissipation effect is significantly improved, meeting the heat dissipation requirements of high-power products, avoiding the shortcomings of conventional air-cooled radiators, and the structure is compact and cost-effective.
Smart Images
Figure CN223859476U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to photovoltaic grid-connected inverter heat dissipation technical field, concretely relates to a heat dissipation structure and contain its photovoltaic grid-connected inverter. BACKGROUND
[0002] Photovoltaic grid-connected inverter is the core equipment of photovoltaic power generation system, and it utilizes the switching characteristic of power semiconductor device (such as IGBT etc.) to transform electric energy, realizes direct current inversion for alternating current. Therefore, the conversion of electric energy to heat energy is inevitable, so the heat design level of heat source device in photovoltaic grid-connected inverter is the key to determine the competitiveness of product. With the improvement of product power grade, the heat dissipation requirement is increasingly rigorous.
[0003] In current photovoltaic grid-connected inverter product, the heat source module is usually packaged by high power density semiconductor device, generally arranged in two rows vertically on the heat sink substrate, respectively corresponding to the direct current side and alternating current side of product, and the heat is exchanged with air through the heat sink. The heat sink structure is generally a notched heat sink, including a base plate and a condenser, and part of the structure is embedded with a heat pipe.
[0004] The existing heat dissipation scheme has the following disadvantages:
[0005] (1) The heat sink mainly relies on the heat conduction of solid and the convection with air to dissipate heat, and the overall thermal resistance is high, and the heat dissipation capacity is limited. The solid material is generally aluminum alloy, and the heat conduction coefficient is in the order of 100-200 W / m·K, and the heat conduction capacity is limited. Even if the heat pipe is embedded, the heat resistance cannot be effectively improved due to the limited coverage area. The heat exchange effect with the air side is determined by the area of the fin and the air flow rate, and there is a process bottleneck. Therefore, the conventional notched heat sink or the notched heat sink with embedded heat pipe in the base plate cannot meet the heat dissipation requirements of high power level products;
[0006] (2) In the heat sink with double-row heat source arrangement, each row of heat source has different loss and different heat dissipation temperature rise requirements. Moreover, the conventional notched heat sink is integrally formed and processed, and it is difficult to customize the design according to the specific heat source position, which usually leads to overdesign problem and cost waste.
[0007] (3) In the fin type heat dissipation structure, air is usually blown from one end of the fin to the other end, so that the air temperature rise is superimposed, causing the heat dissipation environment of the heat source at the rear end of the fin to be poor.
[0008] Therefore, it is necessary to develop a new type of heat dissipation structure to meet the heat dissipation requirements of high power level products. UTILITY MODEL CONTENTS
[0009] The utility model discloses a technical problem to be solved is to the above -mentioned problem of prior art, provide a compact structure, high stability and the heat dissipation structure of remarkable heat dissipation effect and contain its photovoltaic grid-connected inverter.
[0010] In order to solve the above technical problems, the utility model adopts the technical scheme that:
[0011] A heat dissipation structure, including the heat dissipation of heat source device for inverter radiator, for the cooling radiator of the radiator is cooled by cooling fan;Wherein, the radiator includes several phase change condensers that can be wind cooled;The radiator is at least two, and the two adjacent radiator is first radiator and second radiator respectively, and the cooling fan is arranged between the first radiator and the second radiator, and the first radiator and second radiator and cooling fan, and the end of first radiator and the end of second radiator form the air flow of air duct.
[0012] As a further improvement of the utility model, the radiator further includes a substrate, the inside of the substrate and the inside of the phase change condenser are communicated with each other to form a phase change gas-liquid circulation channel, and the substrate is filled with a refrigerant working medium.
[0013] As a further improvement of the utility model, the phase change condenser is provided with a plurality of partitions inside to form a cooling structure that the phase change side channel and the air side channel are alternately circulated.
[0014] As a further improvement of the utility model, the phase change side channel and the air side channel are arranged with a fin for heat exchange enhancement.
[0015] As a further improvement of the utility model, the fin includes a straight-through fin or a sawtooth fin or a corrugated fin.
[0016] As a further improvement of the utility model, the phase change condenser of the first radiator and the phase change condenser of the second radiator are both arranged upwardly inclined to realize that the liquid working medium after phase change in the phase change condenser is automatically returned to the substrate under the action of gravity.
[0017] As a further improvement of the utility model, the upward inclination angle of the phase change condenser is less than 20°.
[0018] As a further improvement of the utility model, the phase change condenser of the first radiator and the phase change condenser of the second radiator are both arranged downwardly inclined, and the bottom end of the phase change condenser is communicated to the substrate through a liquid return pipe to realize that the liquid working medium after phase change in the phase change condenser is returned to the substrate through the liquid return pipe.
[0019] As a further improvement of the utility model, the condenser of the first radiator is arranged upwardly inclined, and the condenser of the second radiator is arranged downwardly inclined; and the bottom end of the phase-change condenser of the second radiator is communicated to the base plate through a liquid return pipe, so as to realize that the phase-changed liquid working medium in the phase-change condenser returns to the base plate through the liquid return pipe.
[0020] As a general technical concept, the utility model further provides a photovoltaic grid-connected inverter comprising the heat dissipation structure.
[0021] Compared with the prior art, the utility model has the advantages that:
[0022] 1、 the heat dissipation structure of the utility model, through setting up the cooling fan between the two adjacent radiators to guide the wind direction, sucking the air from the upper and lower end faces of the radiator or blowing the air to the upper and lower end faces, so that the double-row heat source areas are decoupled from each other, the air speed flowing through the radiator is increased, the heat dissipation air environments do not affect each other, and the defect that the heat dissipation environment of the heat source at the air outlet end of the conventional chisel tooth radiator deteriorates is overcome; at the same time, the phase-change condenser is used for cooling, the characteristics of strong phase-change heat transfer capacity are utilized, the rapid transfer of heat is realized, and due to the existence of the phase-change process of a large space, the heat dissipation effect is obviously stronger than that of the conventional air-cooled radiator.
[0023] 2、 the photovoltaic grid-connected inverter of the utility model, the three-dimensional space phase-change circulation system is constructed by reasonably utilizing the space at the back of the radiator base plate, the heat dissipation effect is obviously higher than that of the conventional air-cooled radiator, and the heat dissipation demand of the high-power grade product is well met. ACCURACY OF DRAWINGS
[0024] Figure 1 it is structure principle schematic drawing of the heat dissipation structure in the embodiment 1 of the utility model;
[0025] Figure 2 it is structure principle schematic drawing of the heat dissipation structure in the embodiment 1 of the utility model;
[0026] Figure 3 it is structure principle schematic drawing of the heat dissipation structure in the embodiment 1 of the utility model;
[0027] Figure 4 it is structure principle schematic drawing of the heat dissipation structure in the embodiment 2 of the utility model;
[0028] Figure 5 it is structure principle schematic drawing of the heat dissipation structure in the embodiment 3 of the utility model; wherein, figure (a) indicates that air is inhaled from both ends, and figure (b) indicates that air is inhaled from the middle;
[0029] Legend: 101, first heat source device; 102, second heat source device; 2, heat sink; 21, first heat sink; 22, second heat sink; 201, base plate; 202, phase change condenser; 2021, partition; 203, liquid return pipe; 3, cooling fan; 4, air duct; 5, air side channel; 6, phase change side channel. DETAILED DESCRIPTION
[0030] The utility model will be further described below in combination with the drawings and specific preferred embodiments, but it does not limit the protection scope of the utility model.
[0031] In the description of the utility model, it is understood that the orientation or positional relationship indicated by the terms "side", "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" are based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, and cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model.
[0032] In addition, the terms "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features, so that the features with "first" and "second" can explicitly or implicitly include one or more features, and in the description of the utility model, the meaning of "multiple" is two or more, unless otherwise specifically limited.
[0033] Example 1
[0034] As shown in Figure 1 , Figure 2 and Figure 3 , the heat dissipation structure of the utility model comprises a heat sink 2 for dissipating heat of the heat source device of the inverter, and a cooling fan 3 for air cooling the heat sink 2. Specifically, the heat sink 2 comprises a plurality of phase change condensers 202 capable of air cooling. Specifically, the heat sink 2 is two, which are a first heat sink 21 and a second heat sink 22, and the first heat source device 101 and the second heat source device 102 are arranged on the first heat sink 21 and the second heat sink 22 respectively. There is sufficient space between the two adjacent heat sinks 2, and the cooling fan 3 is arranged between the first heat sink 21 and the second heat sink 22, and the first heat sink 21 and the second heat sink 22 and the cooling fan 3, and the end of the first heat sink 21 and the end of the second heat sink 22 form an air duct 4 for air flow.
[0035] In this embodiment, the mounting surface of the cooling fan 3 can be flush with the top end surface of the phase change condenser 202, or slightly protrude from the surface of the heat dissipation structure body. The specific arrangement depends on the structural size limitation and the flow resistance evaluation result. This arrangement does not occupy other space and has compact structure. The air duct 4 has two ends as inlets, and the cooling fan 3 sucks air from the middle position of the air duct 4 outward. The overall air flow resistance is relatively optimal, and the air flow environments of the two rows of heat source areas are isolated from each other and have no mutual influence.
[0036] In this embodiment, the cooling fan 3 is arranged between the two adjacent heat sinks 2 to guide the air flow direction. The air is sucked from the upper and lower end surfaces of the heat sink 2 or blown to the upper and lower end surfaces, so that the two rows of heat source areas are decoupled from each other, the air flow speed through the heat sink 2 is increased, the heat dissipation air environments do not affect each other, and the deterioration of the heat dissipation environment of the heat source at the air outlet end of the conventional notched heat sink is overcome. At the same time, the phase change condenser 202 is used for cooling. The phase change heat transfer capacity is strong, the heat is quickly transferred, and the heat dissipation effect is obviously stronger than that of the conventional air-cooled heat sink.
[0037] As shown in Figure 3 The heat sink 2 further includes a base plate 201. The inside of the base plate 201 is in communication with the inside of the phase change condenser 202 to form a phase change gas-liquid circulation channel. The base plate 201 is filled with a refrigerant working medium. In this embodiment, the base plate 201 is arranged vertically. The heat source device is arranged at the lower part of the base plate 201. The liquid filling height of the refrigerant working medium should completely cover the heat source area. The arrangement position of the phase change condenser 202 should be higher than the position of the heat source device.
[0038] In this embodiment, two heat sinks 2 are used to dissipate heat for two rows of heat source devices. According to the size and spacing of the heat source device, the two heat sinks 2 can share one base plate 201. The inside of the base plate 201 is isolated by a partition plate. Alternatively, two independent base plates 201 can be used for later splicing. The phase change condenser 202 and the liquid filling amount can be independently designed according to the specific heat source requirements to avoid overdesign.
[0039] As shown in Figure 3 The phase change condenser 202 is provided with a plurality of partition plates 2021 inside to form a cooling structure in which the phase change side channel 5 and the air side channel 6 are alternately circulated.
[0040] Further, the phase change side channel 5 and the air side channel 6 are both arranged with fins (not shown in the figure) for heat exchange enhancement. The vapor of phase change enters the condenser fin channel and exchanges heat with the outside circulating air side. After condensing into liquid, it flows back to the inside of the base plate 201 and circulates repeatedly to achieve rapid heat transfer. Due to the large space of the phase change process, the heat dissipation effect is obviously stronger than that of the conventional air-cooled heat sink.
[0041] In this embodiment, the clamp is a straight-through clamp. In other embodiments, the clamp can also be a zigzag clamp or a corrugated clamp, and the specific implementation can be selected according to the flow resistance and heat dissipation performance requirements.
[0042] As shown in Figure 2 and Figure 3 , the phase change condenser 202 of the first heat sink 21 and the phase change condenser 202 of the second heat sink 22 are both arranged upwardly inclined, so as to realize that the liquid working medium after phase change in the phase change condenser 202 automatically returns to the substrate 201 under the action of gravity. Further, the angle of the upward inclination of the phase change condenser 202 is less than 20°.
[0043] In this embodiment, the phase change condenser 202 and the substrate 201 are fixed by welding, which occupies small space, and also makes the vapor after phase change in the substrate 201 directly enter the phase change condenser 202, so that the flow area is large and the resistance is small, and the overall profile size of the heat sink is relatively optimal, which can directly replace the conventional air-cooled fin heat sink.
[0044] In this embodiment, a photovoltaic grid-connected inverter is also provided, which comprises the heat dissipation structure described above. The three-dimensional phase change circulation system is constructed by reasonably utilizing the space at the back of the heat sink substrate, and the heat dissipation effect is significantly higher than that of the conventional air-cooled heat sink, which well meets the heat dissipation demand of high-power products.
[0045] Embodiment 2
[0046] As shown in Figure 4 , the heat dissipation structure of the utility model has similar structure arrangement and working principle with the heat dissipation structure in embodiment 1, and the difference mainly lies in that the phase change condenser 202 of the first heat sink 21 and the phase change condenser 202 of the second heat sink 22 are both arranged downwardly inclined, and the bottom end of the phase change condenser 202 is communicated to the substrate 201 through the liquid return pipe 203, so as to realize that the liquid working medium after phase change in the phase change condenser 202 returns to the substrate 201 through the liquid return pipe 203.
[0047] In this embodiment, the phase change condenser 202 is inclined downwardly at a certain angle relative to the horizontal direction, and the liquid return pipe 203 is used to construct the condensation liquid return channel. The starting end of the liquid return pipe 203 is located at the end part of the condenser 202, which is in the direction away from the substrate 201, and the terminal end of the liquid return pipe 203 is located below the heat source of the substrate 201. The path of the liquid return pipe 203 is not constrained, and should be determined according to the specific performance requirements and wind direction.
[0048] Embodiment 3
[0049] As shown in Figure 5As shown, the heat dissipation structure of the utility model has similar structure arrangement and working principle with the heat dissipation structure in embodiment 1, and the difference mainly lies in: the phase change condenser 202 of the first radiator 21 is arranged upwardly inclined, and the phase change condenser 202 of the second radiator 22 is arranged downwardly inclined; and the bottom end of the phase change condenser 202 of the second radiator 22 is communicated to the base plate 201 through the liquid return pipe 203, so as to realize that the phase changed liquid working medium in the phase change condenser 202 returns to the base plate 201 through the liquid return pipe 203.
[0050] In the embodiment, the phase change condenser 202 in the upper row is arranged obliquely upward without the liquid return pipe 203, and the phase change condenser 202 in the lower row is arranged obliquely downward with the liquid return pipe 203, which expands the space for placing the cooling fan 3, and is particularly suitable for the product with compact structure and limited fan installation.
[0051] As shown, Figure 5 The air flow mode can be middle air suction and two-end air inlet, or middle air blowing and two-end air outlet. The double-row heat source areas are decoupled from each other, and the heat dissipation air environments do not affect each other.
[0052] The above is only the preferred embodiment of the utility model, and the protection scope of the utility model is not limited to the above-mentioned embodiment. Any technical solution under the idea of the utility model belongs to the protection scope of the utility model. It should be noted that, for ordinary technical personnel in the technical field, some improvements and decorations without departing from the principle of the utility model are also considered as the protection scope of the utility model.
Claims
1. A heat dissipating structure, characterized by comprising: The heat dissipation structure comprises a heat sink (2) for dissipating heat of a heat source device of an inverter, and a cooling fan (3) for air cooling the heat sink (2); wherein the heat sink (2) comprises a plurality of air-cooled phase change condensers (202); the heat sink (2) is at least two, and the two adjacent heat sinks (2) are a first heat sink (21) and a second heat sink (22) respectively; the cooling fan (3) is arranged between the first heat sink (21) and the second heat sink (22); and the first heat sink (21), the second heat sink (22), the cooling fan (3), the end of the first heat sink (21) and the end of the second heat sink (22) form an air flow channel (4).
2. The heat dissipating structure according to claim 1, wherein The heat sink (2) further comprises a base plate (201), the inside of the base plate (201) and the inside of the phase change condenser (202) are in communication with each other to form a phase change gas-liquid circulation channel; and the base plate (201) is filled with a refrigerant working medium.
3. The heat dissipating structure according to claim 2, wherein The phase change condenser (202) is provided with a plurality of partitions (2021) inside to form a cooling structure for alternating circulation of phase change side channels (5) and air side channels (6).
4. The heat dissipating structure according to claim 3, wherein The phase change side channels (5) and the air side channels (6) are both arranged with fins for heat exchange enhancement.
5. The heat dissipating structure according to claim 4, wherein The fins comprise straight-through fins, sawtooth fins or corrugated fins.
6. The heat dissipating structure according to any one of claims 2 to 5, wherein The phase change condensers (202) of the first heat sink (21) and the second heat sink (22) are both arranged upwardly inclined to realize automatic backflow of the phase changed liquid working medium in the phase change condensers (202) to the base plate (201) under the action of gravity.
7. The heat dissipating structure according to claim 6, wherein The upward inclination angle of the phase change condensers (202) is less than 20°.
8. The heat dissipating structure according to any one of claims 2 to 5, wherein The phase change condensers (202) of the first heat sink (21) and the second heat sink (22) are both arranged downwardly inclined, and the bottom ends of the phase change condensers (202) are communicated to the base plate (201) through a liquid return pipe (203) to realize backflow of the phase changed liquid working medium in the phase change condensers (202) to the base plate (201) through the liquid return pipe (203).
9. The heat dissipating structure according to any one of claims 2 to 5, wherein The phase change condenser (202) of the first heat sink (21) is arranged upwardly inclined, the phase change condenser (202) of the second heat sink (22) is arranged downwardly inclined, and the bottom end of the phase change condenser (202) of the second heat sink (22) is communicated to the base plate (201) through a liquid return pipe (203) to realize backflow of the phase changed liquid working medium in the phase change condenser (202) to the base plate (201) through the liquid return pipe (203).
10. A photovoltaic grid-tied inverter, characterized by, The heat dissipation structure comprises the heat dissipation structure according to any one of claims 1 to 9.