Liquid cooling plate for photovoltaic heat dissipation, liquid cooling system and manufacturing method of liquid cooling plate

Abstract

The liquid cooling plate for photovoltaic heat dissipation is integrally a square thin plate, a concave spiral flow channel is formed in the plate surface, and the flow channel linearly and upwards extends to the middle of the right side from the lower right corner of the liquid cooling plate, then anticlockwise spirals to the center of the liquid cooling plate from outside to inside, and clockwise spirals to the middle of the left side of the liquid cooling plate from inside to outside. The straight line extends upwards to the left upper corner of the liquid cooling plate; the whole cross section of the flow channel is semicircular, and a cover plate capable of sealing the flow channel is arranged above the flow channel so as to form a cooling pipeline for cooling liquid to flow; and a plastic heat insulation layer formed by an injection molding process is arranged on the outer wall side of the runner. Through reasonable design of the structure of the liquid cooling plate, the use reliability of the liquid cooling plate product can be guaranteed, the uniform heat dissipation effect of the liquid cooling plate product can be improved, and condensation can be prevented, so that the liquid cooling plate and the liquid cooling system have wide market prospects.

Description

Technical Field

[0001] The present invention relates to the technical field of liquid cooling for photovoltaic heat dissipation, and in particular to a liquid cooling plate, a liquid cooling system and a method for manufacturing the liquid cooling plate for photovoltaic heat dissipation. Background Art

[0002] The energy source of photovoltaic power generation is the sun. It uses the photoelectric effect of photovoltaic panels to convert solar energy into electrical energy. It is a clean energy source that is attracting more and more attention and has great potential in the future.

[0003] At present, the photoelectric conversion efficiency of photovoltaic panels is still very low, only about 20%. Most of the solar energy is converted into heat energy, which makes the temperature rise of photovoltaic panels very obvious. However, the photoelectric conversion efficiency of photovoltaic panels is greatly affected by the operating temperature. According to investigations, the photoelectric conversion efficiency will decrease by about 0.3% for every degree increase in the operating temperature. The decline is still a large proportion in the conversion efficiency, which is not high to begin with. In addition, the continuous high temperature working environment will accelerate the failure of electronic components in photovoltaic panels, resulting in a shortened service life of photovoltaic panels. Therefore, people are constantly looking for more efficient, more reliable and lower-cost photovoltaic heat dissipation technology.

[0004] Compared with the traditional air cooling method, the liquid cooling method has higher heat dissipation efficiency, among which the method of heat dissipation using liquid cooling plate heat exchange is the most widely used. However, when the temperature of the outer wall of the coolant pipe in the liquid cooling plate is too low, lower than the dew point temperature of the ambient air, the ambient air will condense dew on the outer wall of the coolant pipe, which may cause negative effects such as short circuit and fire of the photovoltaic panel in severe cases.

[0005] A liquid cooling plate structure is disclosed in the patent document with publication number CN 118463682 A, and the structural reliability and heat dissipation uniformity of the liquid cooling plate need to be improved. A liquid cooling plate structure is also disclosed in the patent document with publication number CN 218069980 U, and the heat dissipation effect and anti-condensation effect of the liquid cooling plate still have much room for improvement. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide a liquid cooling plate, a liquid cooling system and a liquid cooling plate manufacturing method for photovoltaic heat dissipation, which have a more reliable structure, are more convenient to manufacture, have a more uniform and efficient heat dissipation effect, and a more effective and thorough anti-condensation effect.

[0007] In order to solve the above technical problems, the first technical solution adopted by the present invention is:

[0008] The liquid cooling plate used for photovoltaic heat dissipation is a square thin plate as a whole, and a concave spiral flow channel is formed on the plate surface. The flow channel first extends straight upward from the lower right corner of the liquid cooling plate to the middle of the right side, then spirals counterclockwise from the outside to the inside to the center of the liquid cooling plate, then spirals clockwise from the inside to the outside to the middle of the left side of the liquid cooling plate, and then extends straight upward to the upper left corner of the liquid cooling plate;

[0009] The cross section of the flow channel is semicircular as a whole, and a cover plate capable of closing the flow channel is provided above the flow channel to form a cooling channel for the flow of coolant; the diameter of the entire cooling channel gradually decreases from the outside to the inside in a counterclockwise direction in the first half; and gradually increases from the inside to the outside in a clockwise direction in the second half;

[0010] Liquid pipe quick connectors that can be quickly connected to external liquid pipes are provided at the ports located at the lower right corner and the upper left corner of the liquid cooling plate;

[0011] A plastic heat insulation layer formed by an injection molding process is arranged on the outer wall side of the flow channel.

[0012] Furthermore, a cover plate groove for placing a cover plate is provided at the liquid cooling plate located above the flow channel, the side bottom of the cover plate groove is connected with the side top of the flow channel via a step, the width of the bottom of the cover plate is slightly larger than the pipe diameter of the flow channel, the width of the first step is equivalent to the width of the bottom of the cover plate, so that the bottom of the cover plate and the first step form a transition fit; the width of the cover plate groove is slightly larger than the width of the cover plate, and the side surfaces of the cover plate and the cover plate groove are both arranged to be inclined from bottom to top and inward, the cover plate is welded to the liquid cooling plate in the cover plate groove by a brazing process, at which time the brazing material in the brazing process can enter the gap between the side surface of the cover plate and the side surface of the cover plate groove, and also become inclined from bottom to top and inward.

[0013] Furthermore, the cover plate is configured to be spliced ​​together in sections, and the side surfaces of the cover plates one section after another are welded to the liquid cooling plate in the cover plate groove by a brazing process; a downwardly protruding hook is provided on the front end face of the segmented cover plate, and a matching concave hook groove is provided on the rear end face, and the width of the hook and the hook groove is set to 1 / 2 to 2 / 3 of the width of the end face of the segmented cover plate, and the position is centered; the rear end face of the front section cover plate and the front end face of the rear section cover plate are abutted against each other through a connecting structure in which the hook enters the hook groove, and chamfers are provided at the top of the front and rear end faces of the cover plate, and the front and rear bevels form a triangular space for the brazing material to enter, and welding is formed at the front and rear abutting end faces of the segmented cover plate by a brazing process.

[0014] Furthermore, a non-metallic silicone grease thermal conductive coating is coated on the upper surface of the liquid cooling plate, which can conduct the heat of the photovoltaic panel to the entire upper surface of the liquid cooling plate.

[0015] Furthermore, a stamped convex strip is provided on the outer wall of the flow channel, and the cross-section of the convex strip is dovetail-shaped, so that the plastic insulation layer and the convex strip form an inverted structure; at the position corresponding to the convex strip in the flow channel, a stamped concave spoiler groove is provided to disturb the coolant in the flow channel.

[0016] Furthermore, a concave drying groove is provided on the outer surface of the heat insulation layer, a drying bag is placed in the drying groove, and a drying groove cover is tightly clamped at the mouth of the drying groove.

[0017] Furthermore, a layer of anti-condensation water coating is applied on the outer surface of the heat insulation layer, and then thermal insulation cotton is arranged.

[0018] Furthermore, a boss is arranged at the center of the liquid cooling plate, and a fan which can assist the liquid cooling plate in dissipating heat is arranged on the boss.

[0019] The second technical solution adopted by the present invention is:

[0020] The liquid cooling system for photovoltaic heat dissipation comprises a plurality of neatly arranged aforementioned liquid cooling plates, a central refrigerator, a liquid supply main pipe, a booster pump, a liquid supply branch pipe, a liquid return main pipe, a liquid return branch pipe and a delivery pump. The output port of the central refrigerator is connected to the liquid supply main pipe, a booster pump is arranged on the pipeline of the liquid supply main pipe, the liquid supply main pipe and the flow channel inlet of each liquid cooling plate are connected through the liquid supply branch pipe, the liquid return main pipe and the flow channel outlet of each liquid cooling plate are connected through the liquid return branch pipe, the liquid return main pipe is connected to the input port of the central refrigerator, and a delivery pump is arranged on the pipeline of the liquid return main pipe.

[0021] The third technical solution adopted by the present invention is:

[0022] The manufacturing method of the aforementioned liquid cooling plate comprises the following steps:

[0023] S1: Punching and cutting square aluminum sheet;

[0024] S2: A spiral variable diameter flow channel and a cover plate groove are stamped on an aluminum sheet, and a step is stamped on the top of the flow channel side, as well as convex strips and spoiler grooves on the flow channel;

[0025] S3: Punching and cutting the spiral cover plate, and cutting it into segmented cover plates;

[0026] S4: punching hooks and hook grooves on the front and rear end surfaces of the segmented cover plate, respectively, and cutting chamfers on the tops of the front and rear end surfaces;

[0027] S5: Knock the segmented cover plates one by one onto the first step;

[0028] S6: welding the segmented cover plate to the liquid cooling plate in the cover plate groove by a brazing process;

[0029] S7: placing the liquid cooling plate in an injection mold, and injection molding a plastic heat insulation layer on the outer wall side of the flow channel through an injection molding process;

[0030] S8: Grind and smooth the upper surface of the liquid cooling plate, especially where there are external protruding solder joints;

[0031] S9: Apply a layer of non-metallic silicone grease thermal conductive coating on the upper surface of the liquid cooling plate;

[0032] S10: Apply an anti-condensation coating on the outer surface of the thermal insulation layer;

[0033] S11: placing a drying bag in the drying tank, and snapping the drying tank cover into the drying tank opening;

[0034] S12: Glue and fix the thermal insulation cotton on the outside of the thermal insulation layer.

[0035] The liquid cooling plate for photovoltaic heat dissipation provided by the first technical solution of the present invention has the characteristics of more reliable structure, more uniform and efficient heat dissipation effect, and also has the effect of preventing condensation water.

[0036] The liquid cooling system for photovoltaic heat dissipation provided by the second technical solution of the present invention can dissipate heat for large photovoltaic panels and has the characteristics of a wide range of applications.

[0037] The manufacturing method of the liquid cooling plate for photovoltaic heat dissipation provided by the third technical solution of the present invention has the characteristics of convenient manufacturing process and also has the prospect of realizing automated manufacturing.

[0038] The present invention can ensure the reliability of the liquid cooling plate product and improve its uniform heat dissipation effect through reasonable design of the structure, manufacturing method and application mode of the liquid cooling plate, and can prevent condensation. It can also adopt a manufacturing method that is both efficient and low-cost, so that the liquid cooling plate and liquid cooling system of the present invention have broad market prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 is a schematic diagram of the top view of the structure of the liquid cooling plate of the present invention;

[0040] Figure 2 yes Figure 1 Middle AA section;

[0041] Figure 3 yes Figure 2 Enlarged view of middle C;

[0042] Figure 4 yes Figure 3 The structural breakdown diagram of

[0043] Figure 5 yes Figure 1 Middle BB rotation profile;

[0044] Figure 6 It is a structural schematic diagram of the liquid cooling system of the present invention.

[0045] The numbers in the figure are:

[0046] 10-liquid cooling plate, 11-flow channel, 12-cover plate groove, 13-first step, 14-convex strip, 15-spoiler groove, 16-boss, 17-fan;

[0047] 20-cover plate, 21-bevel, 22-triangular space, 23-hook, 24-hook slot;

[0048] 30-Cooling pipe;

[0049] 40-liquid pipe quick connector;

[0050] 50- brazing material;

[0051] 60-thermal conductive coating;

[0052] 70-insulation layer, 71-drying tank, 72-drying bag, 73-drying tank cover;

[0053] 80-anti-condensation coating;

[0054] 90- thermal insulation cotton;

[0055] 101-central refrigerator, 102-liquid supply main pipe, 103-boosting pump, 104-liquid supply branch pipe, 105-liquid return main pipe, 106-liquid return branch pipe, 107-delivery pump. DETAILED DESCRIPTION

[0056] In order to explain the technical content, structural features, achieved objectives and effects of the present invention in detail, the technical solutions in the embodiments of the present invention are clearly and completely described below in combination with the implementation modes and the accompanying drawings.

[0057] It should be noted that in the description of the present invention, the orientations or positional relationships indicated by the terms "upper", "lower", "horizontal", "vertical", "inside", "outside", etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0058] It should also be noted that, in the description of the present invention, the terms "first", "second", etc. are used to distinguish similar features rather than to describe a specific order or sequence. It should be understood that such features can be interchanged under appropriate circumstances.

[0059] See also Figure 1The liquid cooling plate 10 for photovoltaic heat dissipation of the present invention is a square thin plate as a whole, and a concave spiral flow channel 11 is formed on the plate surface. The flow channel 11 first extends straight upward from the lower right corner of the liquid cooling plate 10 to the middle of the right side, then spirals counterclockwise from the outside to the inside to the center of the liquid cooling plate 10, then spirals clockwise from the inside to the outside to the middle of the left side of the liquid cooling plate 10, and then extends straight upward to the upper left corner of the liquid cooling plate 10. It can be understood that the liquid cooling plate 10 can be rectangular or square.

[0060] See also Figure 2 , 3 The cross section of the flow channel 11 is semicircular as a whole, and a cover plate 20 is provided above the flow channel 11 to close the flow channel 11, so as to form a cooling channel 30 for the coolant to flow. Figure 1 Liquid pipe quick connectors 40 are provided at the ports of the flow channel 11 located at the lower right corner and the upper left corner of the liquid cooling plate 10, which can be quickly connected to the external liquid pipe.

[0061] The cooling pipe 30 is arranged in a spiral shape, which is conducive to the smooth flow of the coolant; the entire cooling pipe 30 is first spiraled counterclockwise and then clockwise, and the counterclockwise pipe and the clockwise pipe are alternately arranged, which is conducive to uniform heat dissipation; moreover, the liquid pipe quick connectors 40 at the two ends of the cooling pipe 30 can be blindly connected with the external inlet and outlet liquid pipes, which has the characteristics of strong randomness in the connection operation and wide adaptability of the liquid cooling plate 10.

[0062] See also Figure 1 , 2 The diameter of the entire cooling pipe 30 gradually decreases from the outside to the inside in the counterclockwise direction in the first half, and gradually increases from the inside to the outside in the clockwise direction in the second half. Therefore, the entire cooling pipe 30 forms a variable diameter pipe with a Venturi effect, which helps the coolant in the cooling pipe 30 to smoothly enter the clockwise spiral from the counterclockwise spiral.

[0063] See also Figure 3 , 4 In order to facilitate the positioning and covering of the cover plate 20 on the flow channel 11, a cover plate groove 12 for placing the cover plate 20 is provided at the liquid cooling plate 10 located above the flow channel 11. The side bottom of the cover plate groove 12 is connected with the side top of the flow channel 11 through a first step 13. The width of the bottom of the cover plate 20 is slightly larger than the pipe diameter of the flow channel 11. The width of the first step 13 is equivalent to the width of the bottom of the cover plate 20, so that the bottom of the cover plate 20 and the first step 13 form a transition fit. With such a configuration, the cover plate 20 can be easily positioned and covered on the flow channel 11, and a relatively tight clamping connection can be formed.

[0064] In order to ensure that the cover plate 20 and the flow channel 11 are firmly combined to form a closed cooling channel 30, the cover plate 20 is welded to the liquid cooling plate 10 in the cover plate groove 12 by a brazing process. To further ensure a firm combination, the width of the cover plate groove 12 is slightly larger than the width of the cover plate 20, so that the brazing material 50 in the brazing process can enter the gap between the side of the cover plate 20 and the side of the cover plate groove 12, thereby increasing the welding strength of the cover plate 20 in the cover plate groove 12. To further ensure a firm combination, the two side surfaces of the cover plate 20 are set to be inclined from bottom to top and inward, and the two side surfaces of the cover plate groove 12 are also set to be inclined from bottom to top and inward. At this time, the brazing material 50 entering the gap is also inclined from bottom to top and inward, thereby increasing the desoldering strength of the cover plate 20.

[0065] See also Figure 5 , taking into account the manufacturing, storage, transportation, damage, installation, replacement, maintenance and other processes of the cover plate 20, the cover plate 20 can be configured to be spliced ​​in sections, and the side surfaces of the cover plates 20 are welded to the liquid cooling plate 10 in the cover plate groove 12 by a brazing process, and the rear end face of the front section cover plate 20 is abutted against the front end face of the rear section cover plate 20 and welded by a brazing process. In order to facilitate and strengthen the brazing of the end faces of the cover plate 20, the top of the front and rear end faces of the cover plate 20 are chamfered 21, and the triangular space 22 formed by the front and rear chamfers 21 is provided for the brazing material 50 to enter. In order to quickly position and splice the segmented cover plate 20, a hook 23 protruding downward is provided on the front end face of the segmented cover plate 20, and a matching concave hook groove 24 is provided on the rear end face. Taking into account the stamping processing cost of manufacturing the segmented cover plate 20, the hook 23 and the hook groove 24 are set to be the same width as the end face of the segmented cover plate 20. However, in order to facilitate the segmented cover plate 20 to be positioned and abutted by the hook 23, the width of the hook 23 and the hook groove 24 can be set to 1 / 2 to 2 / 3 of the width of the end face of the segmented cover plate 20, and the position is centered.

[0066] See also Figure 2 , 3 4.5. A layer of non-metallic silicone thermal conductive coating 60 is coated on the upper surface of the liquid cooling plate 10. The thermal conductive coating 60 can lead the heat of the photovoltaic panel to the entire upper surface of the liquid cooling plate 10, which is beneficial to heat dissipation through heat exchange with the coolant in the liquid cooling plate 10 and natural heat dissipation through the entire liquid cooling plate 10.

[0067] See also Figure 2 , 34. To prevent condensation of dew on the outer wall of the flow channel 11, a heat insulation layer 70 is provided on the outer wall of the flow channel 11. The heat insulation layer 70 can be formed into a plastic heat insulation layer 70 by an injection molding process. To improve the bonding strength between the heat insulation layer 70 and the flow channel 11, a convex strip 14 is provided on the outer wall of the flow channel 11. The cross section of the convex strip 14 is dovetail-shaped, so that the plastic heat insulation layer 70 and the convex strip 14 form an inverted structure, thereby achieving the purpose of improving the bonding strength. A concave spoiler groove 15 is provided at a position corresponding to the convex strip 14 in the flow channel 11. The spoiler groove 15 can play a spoiler role on the coolant in the flow channel 11, so as to promote the coolant to fully exchange heat. The convex strip 14 and the spoiler groove 15 on the flow channel 11 are formed together by a stamping process.

[0068] In order to further prevent condensation, a concave drying groove 71 is provided on the outer surface of the heat insulation layer 70 , a drying bag 72 is placed in the drying groove 71 , and a drying groove cover 73 is tightly clamped at the mouth of the drying groove 71 .

[0069] In order to further prevent condensation, an anti-condensation coating 80 is coated on the outer surface of the heat insulation layer 70 .

[0070] To further prevent condensation, a heat-insulating cotton 90 is arranged outside the heat-insulating layer 70, which can not only provide further insulation but also absorb any condensation that may occur. The heat-insulating cotton 90 can be fixed to the outside of the heat-insulating layer 70 by gluing or screwing.

[0071] See also Figure 1 , 2 A boss 16 is provided at the center of the liquid cooling plate 10 , and a fan 17 is provided on the boss 16 , and the fan 17 can assist the liquid cooling plate 10 in dissipating heat.

[0072] The liquid cooling plate 10 for photovoltaic heat dissipation of the present invention can be used alone, and the liquid cooling plate 10 can be attached to the photovoltaic panel for heat dissipation through connectors such as quick clamps or screws (not shown in the figure); it can also be used as a minimum unit, repeatedly arranged, and used in combination, that is, the liquid cooling system for photovoltaic heat dissipation of the present invention.

[0073] See also Figure 6 The liquid cooling system for photovoltaic heat dissipation of the present invention comprises a plurality of neatly arranged liquid cooling plates 10, a central refrigerator 101, a liquid supply main pipe 102, a booster pump 103, a liquid supply branch pipe 104, a liquid return main pipe 105, a liquid return branch pipe 106 and a delivery pump 107. The output port of the central refrigerator 101 is connected to the liquid supply main pipe 102, and a booster pump 103 is provided on the pipeline of the liquid supply main pipe 102. The liquid supply main pipe 102 is connected to the inlet of the flow channel 11 of each liquid cooling plate 10 through the liquid supply branch pipe 104, and the liquid return main pipe 105 is connected to the outlet of the flow channel 11 of each liquid cooling plate 10 through the liquid return branch pipe 106. The liquid return main pipe 105 is connected to the input port of the central refrigerator 101, and a delivery pump 107 is provided on the pipeline of the liquid return main pipe 105.

[0074] The liquid cooling system for photovoltaic heat dissipation of the present invention can dissipate heat for large photovoltaic panels. By gradient-standardizing the size specifications of the liquid cooling plate 10, liquid cooling plates 10 of common specifications can be pre-stored in advance, thereby achieving the purpose of rapid response to needs; moreover, the multi-gradient standardized size specifications can match most usage requirements and have the characteristics of a wide range of applications.

[0075] The manufacturing method of the liquid cooling plate 10 of the present invention comprises the following steps:

[0076] S1: Punching and cutting square aluminum sheet;

[0077] S2: stamping a spiral variable diameter flow channel 11 and a cover plate groove 12 on an aluminum sheet, and stamping a first step 13 on the top of the side of the flow channel 11, as well as a convex strip 14 and a spoiler groove 15 on the flow channel 11;

[0078] S3: Punching and cutting the spiral cover plate 20, and cutting it into segmented cover plates 20;

[0079] S4: punching a hook 23 and a hook groove 24 on the front and rear end surfaces of the segmented cover plate 20, respectively, and cutting and forming a chamfer 21 on the top of the front and rear end surfaces;

[0080] S5: knock the segmented cover plates 20 one by one and clamp them on the first step 13;

[0081] S6: welding the segmented cover plate 20 to the liquid cooling plate 10 in the cover plate groove 12 by a brazing process;

[0082] S7: placing the liquid cooling plate 10 in an injection mold, and injection molding a plastic heat insulation layer 70 on the outer wall side of the flow channel 11 through an injection molding process;

[0083] S8: Grinding and smoothing the upper surface of the liquid cooling plate 10, especially the place with the outer convex welding braze;

[0084] S9: coating a layer of non-metallic silicone grease thermal conductive coating 60 on the upper surface of the liquid cooling plate 10;

[0085] S10: coating an anti-condensation water coating 80 on the outer surface of the heat insulation layer 70;

[0086] S11: placing a drying bag 72 in the drying tank 71 and clamping the drying tank cover 73 at the mouth of the drying tank 73;

[0087] S12: The heat-insulating cotton 90 is glued and fixed on the outer side of the heat-insulating layer 70 .

[0088] Through conventional stamping, brazing, injection molding, coating and other processes, a qualified liquid cooling plate 10 can be manufactured, and these processes have the prospect of full automation, which can further improve manufacturing efficiency and ensure manufacturing quality. Taking into account the manufacturing cost, quality assurance and heat dissipation effect, the above process steps are selected to complete the manufacturing, so that the manufacturing of the liquid cooling plate 10 has a very high cost performance.

[0089] The above is only a preferred embodiment of the present invention to help understand the creative idea of ​​the present invention, and does not limit the technical scope of the present invention. Any non-creative equivalent changes made to the above embodiments based on the technical essence of the present invention still fall within the scope of the present invention.

Claims

1. The liquid cooling plate used for photovoltaic heat dissipation is a square thin plate as a whole, and its characteristics are: A concave spiral flow channel is formed on the plate surface, which first extends straight upward from the lower right corner of the liquid cooling plate to the middle of the right side, then spirals counterclockwise from the outside to the inside to the center of the liquid cooling plate, then spirals clockwise from the inside to the outside to the middle of the left side of the liquid cooling plate, and then extends straight upward to the upper left corner of the liquid cooling plate; The cross section of the flow channel is semicircular as a whole, and a cover plate capable of closing the flow channel is provided above the flow channel to form a cooling channel for the flow of coolant; the diameter of the entire cooling channel gradually decreases from the outside to the inside in a counterclockwise direction in the first half; and gradually increases from the inside to the outside in a clockwise direction in the second half; Liquid pipe quick connectors that can be quickly connected to external liquid pipes are provided at the ports located at the lower right corner and the upper left corner of the liquid cooling plate; A plastic heat insulation layer formed by an injection molding process is arranged on the outer wall side of the flow channel.

2. The liquid cooling plate for photovoltaic heat dissipation according to claim 1 is characterized in that: A cover plate groove for placing a cover plate is provided at the liquid cooling plate located above the flow channel, the side bottom of the cover plate groove is connected with the side top of the flow channel through a step, the width of the bottom of the cover plate is slightly larger than the pipe diameter of the flow channel, the width of the first step is equivalent to the width of the bottom of the cover plate, so that the bottom of the cover plate and the first step form a transition fit; the width of the cover plate groove is slightly larger than the width of the cover plate, and the cover plate and the side surfaces of the cover plate groove are both set to be inclined from bottom to top and inward, the cover plate is welded to the liquid cooling plate in the cover plate groove by a brazing process, at this time the brazing material in the brazing process can enter the gap between the side surface of the cover plate and the side surface of the cover plate groove, and also become inclined from bottom to top and inward.

3. The liquid cooling plate for photovoltaic heat dissipation according to claim 2 is characterized in that: The cover plate is configured to be spliced ​​in sections, and the side surfaces of the cover plates one section after another are welded to the liquid cooling plate in the cover plate groove by a brazing process; a downwardly protruding hook is provided on the front end face of the segmented cover plate, and a matching concave hook groove is provided on the rear end face, and the width of the hook and the hook groove is set to 1 / 2 to 2 / 3 of the width of the end face of the segmented cover plate, and the position is centered; the rear end face of the front section cover plate and the front end face of the rear section cover plate are abutted against each other through a connecting structure in which the hook enters the hook groove, and chamfers are formed at the top of the front and rear end faces of the cover plate, and the front and rear chamfers form a triangular space for the brazing material to enter, and welding is formed at the front and rear abutting end faces of the segmented cover plate by a brazing process.

4. The liquid cooling plate for photovoltaic heat dissipation according to claim 3 is characterized in that: A non-metallic silicone grease thermal conductive coating is coated on the upper surface of the liquid cooling plate, which can conduct the heat of the photovoltaic panel to the entire upper surface of the liquid cooling plate.

5. The liquid cooling plate for photovoltaic heat dissipation according to claim 4 is characterized in that: A stamped convex strip is provided on the outer wall of the flow channel, and the cross-section of the convex strip is dovetail-shaped, so that the plastic insulation layer and the convex strip form an inverted structure; a stamped concave spoiler groove is provided at the position corresponding to the convex strip in the flow channel, which can spoil the coolant in the flow channel.

6. The liquid cooling plate for photovoltaic heat dissipation according to claim 5 is characterized in that: A concave drying groove is arranged on the outer surface of the heat insulation layer, a drying bag is placed in the drying groove, and a drying groove cover is tightly clamped at the mouth of the drying groove.

7. The liquid cooling plate for photovoltaic heat dissipation according to claim 6 is characterized in that: A layer of anti-condensation coating is applied on the outer surface of the thermal insulation layer, and then thermal insulation cotton is arranged.

8. The liquid cooling plate for photovoltaic heat dissipation according to claim 7 is characterized in that: A boss is arranged at the center of the liquid cooling plate, and a fan which can assist the liquid cooling plate in dissipating heat is arranged on the boss.

9. A liquid cooling system for photovoltaic heat dissipation, comprising a central refrigerator, a liquid supply main pipe, a booster pump, a liquid supply branch pipe, a liquid return main pipe, a liquid return branch pipe and a delivery pump, characterized in that: It also includes a plurality of neatly arranged liquid cooling plates as described in any one of claims 1 to 8; the output port of the central refrigerator is connected to the liquid supply main pipe, a booster pump is provided on the pipeline of the liquid supply main pipe, the liquid supply main pipe and the flow channel inlet of each liquid cooling plate are connected through a liquid supply branch pipe, the liquid return main pipe and the flow channel outlet of each liquid cooling plate are connected through a liquid return branch pipe, the liquid return main pipe is connected to the input port of the central refrigerator, and a delivery pump is provided on the pipeline of the liquid return main pipe.

10. The method for manufacturing the liquid cooling plate according to claim 7, characterized in that: The steps include: S1: Punching and cutting square aluminum sheet; S2: A spiral variable diameter flow channel and a cover plate groove are stamped on an aluminum sheet, and a step is stamped on the top of the flow channel side, as well as convex strips and spoiler grooves on the flow channel; S3: Punching and cutting the spiral cover plate, and cutting it into segmented cover plates; S4: punching hooks and hook grooves on the front and rear end surfaces of the segmented cover plate, respectively, and cutting chamfers on the tops of the front and rear end surfaces; S5: Knock the segmented cover plates one by one onto the first step; S6: welding the segmented cover plate to the liquid cooling plate in the cover plate groove by a brazing process; S7: placing the liquid cooling plate in an injection mold, and injection molding a plastic heat insulation layer on the outer wall side of the flow channel through an injection molding process; S8: Grind and smooth the upper surface of the liquid cooling plate, especially where there are external protruding solder joints; S9: Apply a layer of non-metallic silicone grease thermal conductive coating on the upper surface of the liquid cooling plate; S10: Apply an anti-condensation coating on the outer surface of the thermal insulation layer; S11: placing a drying bag in the drying tank, and snapping the drying tank cover into the drying tank opening; S12: Glue and fix the thermal insulation cotton on the outside of the thermal insulation layer.

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