A passive three-dimensional through-cavity uniformly mixed turbulent flow heat sink for radiator and a manufacturing method thereof

Abstract

The present invention discloses a non-active three-dimensional through-cavity uniformly mixed and disturbed flow heat sink for a radiator. The heat sink is composed of two heat sink monoliths welded opposite to each other, and is composed of a branch flow cavity with oil inlets and outlets at the upper and lower ends and an inner cavity connected mixed flow cavity with a branch flow groove and a flow blocking guide peak. A plurality of branch flow grooves and flow blocking guide peaks are distributed on the heat dissipation surface of the heat sink monolith. The heat sink for a transformer made of the heat sink can form a three-dimensional uniformly mixed flow and disturbed flow state in the flow field inside and outside the heat sink under non-active cooling conditions, and at the same time, the fluids in the oil-side mixed flow field inside the heat sink and the gas-side mixed flow field outside the heat sink are continuously mixed and disturbed, which plays a role in strengthening heat transfer, thereby achieving the effect of greatly improving the heat dissipation capacity of the heat sink, and then achieving the economic effect of reducing the number of heat sink groups or the number of pieces used for the transformer without increasing the amount of sheet material used.

Description

Technical Field

[0001] The present invention relates to the technical field of processing and manufacturing radiators for transformers, and in particular provides a passive three-dimensional through-cavity uniformly mixed turbulent flow radiator for the radiator and a manufacturing method thereof. Background Art

[0002] Operating oil-immersed transformers and reactors generate a certain amount of energy loss in components such as the windings and core, which is converted into heat. Only a small portion of this heat is transferred to the oil tank walls through the transformer through heat conduction and convection and dissipated into the air. The vast majority of this heat cannot be quickly and effectively dissipated through the flat walls of the transformer's oil tank, directly increasing transformer oil temperature and, in turn, reducing insulation life. Therefore, it is imperative to consider other more effective heat dissipation measures to address the heat dissipation issues faced by oil-immersed transformers. After nearly half a century of practice and development, plate-type heat sinks have become the mainstream solution for dissipating heat in oil-immersed transformers and reactors. They are particularly widely used in low-noise, ONAN-based products. Currently, the common plate-type heat sink structure for transformers in the industry features multiple, single, longitudinal oil channels with no interconnection, preventing effective mixing and turbulence between the liquid and gas phases inside and outside the heat sink. Due to these structural and technical reasons, the overall heat transfer coefficient (K) of plate-type heat sinks is relatively low. Therefore, to achieve the required heat dissipation, a large number of fin groups or the use of ONAF or OFAF cooling methods are often required. For example, a large transformer of 67MVA / 500KV needs to use a PC2800-28 / 520(32) heat sink group to meet the heat dissipation requirements. However, the structural dimensions of the heat sink group itself occupy a large lateral space of the transformer and are relatively high in cost, resulting in large space occupation and high cost. Therefore, without increasing the material cost of the radiator or reducing its material cost, and at the same time under passive working conditions, the heat sink of the transformer heat sink is provided with a through-cavity oil channel, so that the liquid and gas phases inside and outside the heat sink are continuously mixed and disturbed, which is a necessary condition for improving its effective heat dissipation capacity. The present invention will effectively solve the above technical bottleneck. Summary of the Invention

[0003] The present invention aims to provide a passive three-dimensional through-cavity uniformly mixed flow heat sink for radiators and its manufacturing method. This passive three-dimensional uniformly mixed flow heat sink uses a thin sheet of steel or aluminum. The sheet is rolled using a pair of rollers driven by a power system and supporting mechanical structure to create the air-side turbulence structure and oil-side mixed flow structure of the heat sink unit. Then, a stamping and rolling system uses a flat die to create heat sink units corresponding to and transitionally connected to multiple mixed flow oil cavities. The sheet is then transported to the above workstations by a sheet material conveying system, completing the passive three-dimensional through-cavity uniformly mixed flow heat sink rolling process. This invention utilizes a through-cavity heat sink with an outer air-side turbulence structure and an inner oil-side mixed flow structure to manufacture a transformer radiator that can... Under passive cooling (ONAN) conditions, a three-dimensional homogeneous and turbulent flow state is formed inside and outside the cavity heat sink. At the same time, the fluids in the oil-side mixed flow field and the gas-side mixed flow field inside and outside the cavity heat sink are continuously mixed and disturbed, which enhances the heat transfer effect. As a result, the heat dissipation capacity of the cavity heat sink of the present invention is significantly improved compared with the existing heat sinks. This achieves the effect of reducing the number of heat sink groups or fins for transformers, reducing the lateral space occupied by the heat sink around the transformer oil tank, reducing the amount of transformer oil used, reducing the transformer manufacturing cost, and reducing the number of fans under fan cooling (ONAF) conditions.

[0004] The present invention, based on the premise of relying on density and position differences to cause the medium to flow, designs an air-side turbulence structure on the outer side of the through-cavity heat sink, so that the air side of the radiator forms a segmented, directed turbulence from bottom to top. During the process of heat dissipation from the air side surface, the heat dissipation airflow on the heat sink surface rises from the bottom to the top in a superimposed state to dissipate heat. In this case, the upper through-cavity heat sink surface is also affected by the hot air flow from the bottom of the heat sink while dissipating heat. The air-side turbulence structure blocks the upward heat transfer airflow in segments. The heat transfer airflow in each segment will have the effect of separating from the air side surface of the radiator between two blocking guide peaks in the longitudinal direction, thereby preventing the hot air flow from flowing upward from the through-cavity heat sink surface to form a temperature superposition on its surface, thereby improving the heat dissipation efficiency. Each heat dissipation segment dissipates heat under the same conditions close to the ambient temperature, reducing the phenomenon of the upper ambient temperature being higher than the lower ambient temperature due to temperature superposition. In addition, the blocking guide peaks in the air-side turbulence structure laterally interfere with the entire oil flow heat dissipation surface airflow, maximizing the interference effect. Under the diversion and guiding effect of the blocking guide peaks on the rising surface airflow, according to the machinery industry standard JB / T of the People's Republic of China. 5347 "Flat Radiator for Transformer" stipulates that "the distance between self-cooling fins should not be less than 45mm". In actual applications, the distance between fins is mostly based on 45mm. Since the distance between adjacent fins is relatively close, the air-side turbulence structure of multiple through-cavity radiators under such spacing conditions will cause the airflow between the air sides of adjacent through-cavity radiators to interfere with each other, forming an air-side mixed flow field and an oil-side mixed flow field between the through-cavity radiators. The interaction between the two produces a flow field effect that is beneficial to heat dissipation; at the same time, it is designed that the cross-sectional shape of the oil-side mixed flow cavity of the radiator remains unchanged, which will produce laminar slow convection heat dissipation, and the oil-side mixed flow structure is used to change the laminar flow into a mixed flow shape. By setting an oil-side mixed flow structure in the longitudinal direction of the oil-side mixed flow cavity of the radiator, the flow direction of the oil flow in the mixed flow cavity is changed, and the outflow and inflow of the laminar layers are continuously mixed. The oil flow temperatures of each oil flow layer in the mixed flow cavity are fully mixed by changing the oil flow direction, and the inner and outer layers of the oil flow dissipate heat through the surface of the through-cavity heat sink in the mixed flow state, thereby improving the heat dissipation efficiency; two valley-shaped opposite connected mixed flow cavities are designed in the mixed flow cavity, because the cross-sectional area of ​​the mixed flow oil cavity is increased, the outer layer of the oil flow can no longer continue to adhere to the inner wall of the oil flow cavity and flow downward under the action of gravity, but breaks away from the inner wall of the cavity and flows downward into the inner layer of the oil flow to obtain a mixed flow of the inner and outer layers of oil flow, and under the action of the diversion groove of the mixed flow structure, almost all the laminar flow in the mixed flow cavity is diverted and mixed multiple times; the effect of the radiator quickly dissipating the transformer hot oil in the mixed flow cavity is achieved through the above uniformly mixed flow scheme; the technical solution of the present invention can greatly increase the geometric heat dissipation area of ​​the oil side by more than 9% without changing the existing sheet material cost.

[0005] The present invention proposes to optimize the structural design on the air side and oil side of the oil-immersed radiator for the transformer, add mixing and turbulent flow structures, form uniform turbulent flow for the heat transfer air layer and the through-cavity oil flow layer of the radiator, block the air side thermal boundary layer in sections and superimpose it upward to guide the hot gas laminar flow in the section out of the air side surface of the radiator, so that the temperature of the heat transfer air layer is reduced; at the same time, the volume and shape of the mixed flow cavity on the oil side of the radiator are changed in sections, so that the flow direction and flow velocity of the radiator oil are changed and irregular, thereby achieving the purpose of efficient heat dissipation of the segmented turbulent flow on the oil side of the radiator, and the increase in the heat dissipation area on the oil side will increase the effective heat dissipation area of ​​the radiator ONAN, thereby increasing the heat dissipation capacity of the radiator.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a passive three-dimensional cavity uniform turbulence heat sink for radiators, wherein the heat sink 1 is composed of two heat sink 2 welded together, and is composed of a flow distribution cavity 4 with oil inlet and outlet ports 3 at the upper and lower ends and a flow mixing cavity 7 with flow distribution grooves 5 and flow obstruction guide peaks 6. Several flow distribution grooves 5 and flow obstruction guide peaks 6 are distributed on the heat dissipation surface of the heat sink 2.

[0007] The mixing chamber 7 is composed of multiple branch mixing chambers 8, connected mixing chambers 9, branch staggered mixing chambers 10, and connected staggered mixing chambers 11 arranged alternately and interconnected. Their combination constitutes the air-side turbulence structure 12 on the outside of the heat sink 1 and the oil-side mixing structure 13 on the inside.

[0008] The flow mixing cavity 8 is composed of multiple flow-dividing slots 5 arranged at certain intervals on the groove-shaped large plane 14 in the width direction of the heat sink 2;

[0009] The connected mixing cavity 9 is composed of multiple flow-blocking and guiding peaks 6 arranged at certain intervals on the groove-shaped large plane 14 in the width direction of the heat dissipation plate 2.

[0010] The arrangement of the flow divider grooves 5 on the flow divider mixing chamber 10 is staggered with that on the flow divider mixing chamber 8 in both width and length directions.

[0011] The arrangement of the flow-blocking guide peaks 6 on the interconnected and interleaved mixing cavity 11 is interleaved with the arrangement of the flow-blocking guide peaks 6 on the interconnected mixing cavity 9 in both width and length directions.

[0012] Preferably, the oil inlet / outlet 3 is a semi-circular arc-shaped open type and communicates with the manifold 4;

[0013] The flow distribution cavity 4 is provided with a flow distribution groove 5 shape that is transitionally connected to the mixing cavity 7, and the shape of the groove 5 is connected to both ends of the mixing cavity 7 along the length direction at the cavity interval.

[0014] Preferably, the edge of the groove-shaped large plane 14 of the heat dissipation plate 2 is a planar strip-shaped peripheral weld 15, and the groove-shaped large plane 14 is provided with a groove-shaped elongated flow divider 5 that protrudes into the mixing cavity 7 and a flow-blocking guide peak 6 that protrudes outward from the heat dissipation surface.

[0015] The flow-blocking guide peak 6 has a straight arc 16 and a curved arc 17, with the outer side being mountain-shaped and the inner side being valley-shaped; the bottom of the groove-shaped elongated flow divider 5 that rises into the mixing cavity 7 is a plane, and its depth coincides horizontally with the peripheral weld 15 of the edge of the groove-shaped large plane 14 of the heat sink 2. The bottom plane of the elongated flow divider 5 is the spot weld connection of the two heat sink 2.

[0016] Preferably, the straight arcs 16 and the curved arcs 17 on the large groove-shaped plane 14 of the heat dissipation monolith 2 are staggered and arranged, and the combination thereof constitutes an A-type heat dissipation monolith 18;

[0017] The flow-blocking guide peaks 6 on the groove-shaped large plane 14 , which is different from the heat dissipation monolith 2 , are all in the shape of straight arcs 16 , and their combination constitutes a B-type heat dissipation monolith 19 .

[0018] Preferably, the plurality of heat sinks 1 with the air-side turbulent structure 12 and the oil-side mixed flow structure 13 are arranged with a certain distance between the fins, forming an air-side mixed flow field 20 outside the heat sink 1 and an oil-side mixed flow field 21 inside the heat sink 1 .

[0019] A method for manufacturing a passive three-dimensional cavity heat sink for a radiator, wherein the heat sink 1 is made of a thin steel or aluminum plate, and is processed on a rolling die according to the pattern of several flow-diverting grooves 5 and flow-blocking guide peaks 6 distributed on the groove-shaped large plane 14 of the heat sink 2 to form a pair of valley-shaped upper rolling die 22 and mountain-shaped lower rolling die 23; and then processed according to the pattern of the flow-diverting cavity 4 with oil inlet and outlet ports 3 to form a suitable flat die.

[0020] When the valley-shaped upper roll die 22 and the mountain-shaped lower roll die 23 are fully meshed, the position 24 of the keyway at the shaft end is determined, and the position 24 of the keyway at the shaft end and its meshing point 25 are on the vertical center line; when the upper roll die gear 26 and the lower roll die gear 27 are fully meshed, the position 28 of the gear keyway is determined, and the position 28 of the gear keyway and its meshing point 25 are on the vertical center line; by determining the position 28 of the gear keyway on the shaft and the position 24 of the keyway at the shaft end, the pressing of the valley-shaped upper roll die 22 and the mountain-shaped lower roll die 23 on the roll die, as well as the meshing of the upper roll die gear 26 and the lower roll die gear 27, together satisfy the roll die rolling conditions;

[0021] First, separate the valley-shaped upper roller die 22 and the peak-shaped lower roller die 23 in a non-working state, ensuring that the width of the gap between the maximum outer diameters of the two roller dies is greater than the thickness of the sheet material and sufficient for its passage; then apply rotational power to the shaft end 29 of the valley-shaped upper roller die 22, and rotate the peak-shaped lower roller die 23 through the lower roller die gear 27, and apply upward pressure to the two shaft ends 29 of the peak-shaped lower roller die 23 to press the two roller dies together, and the flat sheet material is pressed against the valley-shaped upper roller die 22. The upper roller die 22 and the lower roller die 23 rotate and press together. When rolling to the branch flow cavity 4, the branch flow cavity position 30 is reserved on the flat plate. At this time, the upper roller die gear 26 and the lower roller die gear 27 keep meshing, and the relative pressure applied to the two shaft ends 29 of the peak-shaped lower roller die 23 is released, so that the maximum outer diameters of the valley-shaped upper roller die 22 and the peak-shaped lower roller die 23 are separated, and the width of the gap between the maximum outer diameters of the valley-shaped upper roller die 22 and the peak-shaped lower roller die 23 should be The thickness of the flat plate is greater than that of the flat plate, so that the position 30 of the flat plate on the branch flow cavity is not rolled by the valley-shaped upper roller die 22 and the peak-shaped lower roller die 23, and is transported to the flat die pressing and forming position 31 of the branch flow cavity 4, and the pressing of the two ends of the length direction of the branch flow cavity 4 and the mixing cavity 7 is carried out. In the above process, the upper roller die gear 26 and the lower roller die gear 27 of the shaft end 29 of the paired roller die are always in the meshing state 32 during rolling and the gear meshing state 33 when the rollers are separated, completing After the heat sink 2, type A heat sink 18 or type B heat sink 19 are rolled and formed, the heat sink 2, type A heat sink 18 or type B heat sink 19 are placed opposite each other in pairs, and the peripheral welds 15 with flat edges and the bottom plane of the diversion groove 5 are aligned oppositely on the inner side of the mixed flow cavity 7, and are made using the existing welding process in the industry; the remaining materials on the edges of the heat sink 1 after the piece welding are completed are sheared and transferred to the next process of the radiator 34 manufacturing process.

[0022] The present invention has the following beneficial effects:

[0023] The data of the oil side area of ​​the heat sink measured by three-dimensional software show that the oil side area of ​​the heat sink is increased by about 9% compared with the existing heat sink. Two valley-shaped interconnected mixed flow chambers are designed in the mixed flow chamber. Because the cross-sectional area of ​​the mixed flow oil chamber is increased, the outer layer of the oil flow can no longer continue to flow downward by adhering to the inner wall of the oil flow chamber under the action of gravity, but instead separates from the inner wall of the chamber and flows downward into the inner layer of the oil flow to obtain a mixed flow of the inner and outer layers of oil flow. Moreover, under the action of the diversion groove of the mixed flow structure, the laminar flow in the mixed flow chamber is almost completely diverted and mixed multiple times. The above uniformly mixed flow scheme is used to achieve the effect of the radiator quickly dissipating the transformer hot oil in the mixed flow chamber. The clear technical solution can greatly increase the geometric heat dissipation area of ​​the oil side without changing the cost of existing sheet materials; the role of the air-side turbulence structure of the heat sink on the air-side layer heat transfer and the role of the oil-side mixed flow structure on the oil-side layer heat transfer, as well as the role of continuous mixing and disturbance of the fluid in the oil-side mixed flow field inside and outside the heat sink and the air-side turbulence field between the sheets, it is estimated that the heat dissipation effect of the heat sink of this design under passive cooling (ONAN) conditions is about 15% higher than that of the existing heat sink, and the heat dissipation effect of the heat sink under fan cooling (ONAF) conditions is about 20% higher than that of the existing heat sink.

[0024] Under the premise that the cost of heat sink materials does not increase, the heat dissipation efficiency of the radiator is improved, thereby reducing the cost of radiator materials under unit heat dissipation power. Due to the improved heat dissipation efficiency of the radiator, the number of radiators used in the transformer is reduced, thereby reducing the oil volume of the transformer, reducing the manufacturing cost of the transformer, and also reducing a certain number of radiator cooling fans. Due to the reduction in the number of radiators used in the transformer, the transformer's overall dimensions are reduced, saving equipment space. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a front view of the heat sink;

[0026] Figure 2 This is a cross-sectional view (AA) of the heat sink;

[0027] Figure 3 This is a BB cross-sectional view of the heat sink;

[0028] Figure 4 This is a CC cross-sectional view of the heat sink;

[0029] Figure 5 This is a DD cross-sectional view of the heatsink;

[0030] Figure 6 This is an EE cross-sectional view of the heatsink;

[0031] Figure 7 The diagram shows the cross-sectional views of the heat sink (FF, GG, HH) and the schematic diagram of the cross-sectional shape distribution of each part of the mixing cavity.

[0032] Figure 8 Schematic diagram of the air side turbulence structure fully mixing and disturbing the air flow in the width direction of the heat sink;

[0033] Figure 9 Schematic diagram of the oil-side mixing flow structure fully mixing and disturbing the oil flow on the oil side in the width direction of the heat sink;

[0034] Figure 10 This is the front view of the A-type heat sink;

[0035] Figure 11 This is the front view of the B-type heat sink;

[0036] Figure 12 for Figure 1 I magnified view;

[0037] Figure 13 for Figure 1 I enlarged axonometric view;

[0038] Figure 14 for Figure 10 J magnified view;

[0039] Figure 15 for Figure 10 J enlarged axonometric view;

[0040] Figure 16 Schematic diagram of the air-side mixing flow field and the oil-side mixing flow field for fully mixing and disturbing the oil flow and fully mixing and disturbing the air flow at different cross sections in the thickness direction of multiple heat sinks arranged with a certain fin spacing;

[0041] Figure 17 for Figure 16 K magnified view;

[0042] Figure 18 for Figure 16 L magnified view;

[0043] Figure 19 for Figure 16 Magnified view of M;

[0044] Figure 20 It is a front view schematic diagram of the meshing state of the rollers during rolling;

[0045] Figure 21 It is a front view schematic diagram of the gear meshing state when the rollers are separated;

[0046] Figure 22 for Figure 20 Left view of;

[0047] Figure 23 for Figure 20 NN cross-sectional view;

[0048] Figure 24 for Figure 21 Left view of;

[0049] Figure 25 for Figure 21 PP cross-sectional view;

[0050] Figure 26 It is an axonometric diagram of the rolling process method;

[0051] Figure 27 This is an axonometric diagram of the radiator;

[0052] In the diagram: 1. Heat sink; 2. Heat sink fin; 3. Oil inlet / outlet; 4. Flow manifold; 5. Flow channel; 6. Flow guide peak; 7. Mixing cavity; 8. Flow mixing cavity; 9. Connecting mixing cavity; 10. Flow interleaved mixing cavity; 11. Connecting interleaved mixing cavity; 12. Air-side turbulence structure; 13. Oil-side mixing structure; 14. Large flat surface; 15. Peripheral weld bead; 16. Straight arc; 17. Curved arc; 18. Type A heat sink fin; 19. Type B heat sink 20. Hot single sheet; 21. Gas-side mixed flow field; 22. Oil-side mixed flow field; 23. Valley-shaped upper roll die; 24. Peak-shaped lower roll die; 25. Shaft end keyway position; 26. Meshing point; 27. Upper roll die gear; 28. Lower roll die gear; 29. ​​Gear keyway position; 30. Shaft end; 31. Merging cavity position; 32. Flat plate die pressing and forming position; 33. Meshing state during rolling; 34. Gear meshing state during roll separation; 35. Radiator. DETAILED DESCRIPTION

[0053] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0054] like Figures 1 to 9 As shown, a passive three-dimensional cavity mixed flow heat sink for a radiator is provided. The heat sink 1 is composed of two heat sink pieces 2 welded together and consists of a flow distribution cavity 4 with oil inlet and outlet ports 3 at both ends and a mixed flow cavity 7 with flow distribution grooves 5 and flow obstruction guide peaks 6. Several flow distribution grooves 5 and flow obstruction guide peaks 6 are distributed on the heat dissipation surface of the heat sink piece 2.

[0055] The mixing chamber 7 is composed of multiple branch mixing chambers 8, connected mixing chambers 9, branch staggered mixing chambers 10, and connected staggered mixing chambers 11 arranged alternately and interconnected. Their combination constitutes the air-side turbulence structure 12 on the outside of the heat sink 1 and the oil-side mixing structure 13 on the inside.

[0056] The flow mixing cavity 8 is composed of multiple flow mixing slots 5 arranged at certain intervals on the large plane 14 of the heat sink 2 in the width direction.

[0057] The connecting mixing cavity 9 is composed of multiple flow-blocking and guiding peaks 6 arranged at certain intervals on the groove-shaped large plane 14 in the width direction of the heat sink 2;

[0058] The arrangement of the flow divider grooves 5 on the flow divider mixing chamber 10 is staggered with that on the flow divider mixing chamber 8 in both width and length directions.

[0059] The arrangement of the flow-blocking guide peaks 6 on the interconnected and interleaved mixing cavity 11 is interleaved with the arrangement of the flow-blocking guide peaks 6 on the interconnected mixing cavity 9 in both width and length directions.

[0060] like Figure 1 As shown, the oil inlet / outlet 3 is a semi-circular arc-shaped open type and is connected to the manifold 4;

[0061] The flow distribution cavity 4 is provided with a flow distribution groove 5 that is transitionally connected to the mixing cavity 7. The shape of the groove 5 is connected to both ends of the mixing cavity 7 along its length at the cavity interval.

[0062] like Figure 1 、 7 As shown in 10 to 15, the edge of the groove-shaped large plane 14 of the heat dissipation plate 2 is a planar strip-shaped peripheral weld 15. The groove-shaped large plane 14 is provided with a groove-shaped elongated flow divider 5 that protrudes into the mixing cavity 7 and a flow-blocking guide peak 6 that protrudes outward from the heat dissipation surface.

[0063] The flow-obstructing guide peak 6 has a straight arc 16 and a curved arc 17, with the outer side resembling a mountain peak and the inner side resembling a valley. The bottom of the groove-shaped oblong flow divider 5, which rises into the mixing cavity 7, is a flat plane, and its depth coincides horizontally with the peripheral weld 15 of the edge of the groove-shaped large plane 14 of the heat sink 2. The bottom plane of the oblong flow divider 5 is the spot weld connection of the two heat sink 2.

[0064] like Figure 10 As shown, the straight arc 16 and curved arc 17 flow-blocking guide peaks 6 on the groove-shaped large plane 14 of the heat sink 2 are arranged alternately, and their combination constitutes the type A heat sink 18.

[0065] like Figure 11 As shown, unlike the heat sink 2, the flow-guiding peaks 6 on the grooved large plane 14 are all straight arcs 16, and their combination constitutes the B-type heat sink 19.

[0066] like Figures 16-19 As shown, multiple heat sinks 1 with air-side turbulence structure 12 and oil-side mixing structure 13 are arranged with a certain spacing between the sinks, forming an air-side mixing flow field 20 on the outside of the heat sink 1 and an oil-side mixing flow field 21 on the inside.

[0067] like Figures 20-27As shown, a method for manufacturing a passive three-dimensional cavity heat sink for a radiator is described. The heat sink 1 is made of thin steel or aluminum sheet. The heat sink 1 is processed on a rolling die according to the pattern shape of several flow-diverting grooves 5 and flow-blocking guide peaks 6 distributed on the groove-shaped large plane 14 of the heat sink 2, forming a pair of valley-shaped upper rolling die 22 and mountain-shaped lower rolling die 23. Then, the heat sink 1 is processed according to the pattern shape of the flow-diverting cavity 4 with oil inlet and outlet ports 3, forming a corresponding flat die.

[0068] When the valley-shaped upper roll die 22 and the mountain-shaped lower roll die 23 are fully meshed, the position 24 of the keyway at the shaft end is determined, and the position 24 of the keyway at the shaft end and its meshing point 25 are on the vertical center line; when the upper roll die gear 26 and the lower roll die gear 27 are fully meshed, the position 28 of the gear keyway is determined, and the position 28 of the gear keyway and its meshing point 25 are on the vertical center line; by determining the position 28 of the gear keyway on the shaft and the position 24 of the keyway at the shaft end, the pressing of the valley-shaped upper roll die 22 and the mountain-shaped lower roll die 23 on the roll die, as well as the meshing of the upper roll die gear 26 and the lower roll die gear 27, together satisfy the roll die rolling conditions;

[0069] First, separate the valley-shaped upper roller die 22 and the peak-shaped lower roller die 23 in a non-working state, ensuring that the width of the gap between the maximum outer diameters of the two roller dies is greater than the thickness of the sheet material and sufficient for its passage; then apply rotational power to the shaft end 29 of the valley-shaped upper roller die 22, and rotate the peak-shaped lower roller die 23 through the lower roller die gear 27, and apply upward pressure to the two shaft ends 29 of the peak-shaped lower roller die 23 to press the two roller dies together, and the flat sheet material is pressed against the valley-shaped upper roller die 22. The upper roller die 22 and the lower roller die 23 rotate and press together. When rolling to the branch flow cavity 4, the branch flow cavity position 30 is reserved on the flat plate. At this time, the upper roller die gear 26 and the lower roller die gear 27 keep meshing, and the relative pressure applied to the two shaft ends 29 of the peak-shaped lower roller die 23 is released, so that the maximum outer diameters of the valley-shaped upper roller die 22 and the peak-shaped lower roller die 23 are separated, and the width of the gap between the maximum outer diameters of the valley-shaped upper roller die 22 and the peak-shaped lower roller die 23 should be The thickness of the flat plate is greater than that of the flat plate, so that the position 30 of the flat plate on the branch flow cavity is not rolled by the valley-shaped upper roller die 22 and the peak-shaped lower roller die 23, and is transported to the flat die pressing and forming position 31 of the branch flow cavity 4, and the pressing of the two ends of the length direction of the branch flow cavity 4 and the mixing cavity 7 is carried out. In the above process, the upper roller die gear 26 and the lower roller die gear 27 of the shaft end 29 of the paired roller die are always in the meshing state 32 during rolling and the gear meshing state 33 when the rollers are separated, completing After the heat sink 2, type A heat sink 18 or type B heat sink 19 are rolled and formed, the heat sink 2, type A heat sink 18 or type B heat sink 19 are placed opposite each other in pairs, and the peripheral welds 15 with flat edges and the bottom plane of the diversion groove 5 are aligned oppositely on the inner side of the mixed flow cavity 7, and are made using the existing welding process in the industry; the remaining materials on the edges of the heat sink 1 after the piece welding are completed are sheared and transferred to the next process of the radiator 34 manufacturing process.

[0070] The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be construed as limiting the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A passive three-dimensional through-cavity uniformly mixed flow heat sink for a radiator, characterized in that the heat sink (1) is composed of two heat sink monoliths (2) welded opposite to each other, and is composed of a flow-dividing cavity (4) with oil inlet and outlet ports (3) at upper and lower ends, and a flow-mixing cavity (7) with flow-dividing grooves (5) and flow-blocking guide peaks (6), and a plurality of flow-dividing grooves (5) and flow-blocking guide peaks (6) are distributed on the heat dissipation surface of the heat sink monolith (2); The mixed flow chamber (7) is composed of a plurality of flow-dividing mixed flow chambers (8), connecting mixed flow chambers (9), flow-dividing interlaced mixed flow chambers (10), and connecting interlaced mixed flow chambers (11), which are alternately arranged and interconnected, and the combination of the plurality of flow-dividing mixed flow chambers (10) and the connecting interlaced mixed flow chambers (11) constitutes an air-side turbulent structure (12) on the outside of the heat sink (1) and an oil-side mixed flow structure (13) on the inside; The flow-dividing and mixing chamber (8) is composed of a plurality of flow-dividing grooves (5) arranged at a certain interval on a groove-shaped large plane (14) in the width direction of the heat dissipation single plate (2); The communicating mixed flow cavity (9) is composed of a plurality of flow-blocking guide peaks (6) arranged at a certain interval on a large groove-shaped plane (14) in the width direction of the heat dissipation single plate (2); The arrangement of the flow diverter grooves (5) on the flow diverter interlaced mixing chamber (10) and the arrangement of the flow diverter grooves (5) on the flow diverter mixing chamber (8) are staggered in width and length directions; The arrangement of the flow-blocking guide peaks (6) on the communicating staggered mixing chamber (11) and the arrangement of the flow-blocking guide peaks (6) on the communicating mixing chamber (9) are staggered in width and length directions; The oil inlet and outlet ports (3) are semicircular and open, and communicate with the branch and confluence chamber (4); The diverting flow chamber (4) is provided with a diverting groove (5) shape which is transitionally connected to the mixing flow chamber (7), and the diverting groove (5) shape is connected to both ends of the mixing flow chamber (7) in the length direction at the cavity separation. The edge of the groove-shaped large plane (14) of the heat dissipation single plate (2) is a plane strip-shaped peripheral weld (15), and the groove-shaped large plane (14) is provided with a groove-shaped oblong flow diversion groove (5) protruding into the mixed flow cavity (7) and a flow blocking guide peak (6) protruding toward the outside of the heat dissipation surface; The flow-blocking guide peak (6) has a straight arc (16) and a curved arc (17), and its outer side is in the shape of a mountain peak and its inner side is in the shape of a valley. The bottom of the oblong trough (5) protruding into the mixed flow cavity (7) is a plane, and its depth is horizontally overlapped with the peripheral weld bead (15) at the edge of the large trough plane (14) of the heat dissipation single sheet (2). The bottom plane of the oblong trough (5) is the spot welding connection of the two heat dissipation single sheets (2).

2. A passive three-dimensional through-cavity uniformly mixed turbulent flow heat sink for a radiator according to claim 1, characterized in that the straight arc (16) and the curved arc (17) flow-blocking guide peaks (6) on the groove-shaped large plane (14) different from the heat sink single sheet (2) are arranged alternately, and the combination thereof constitutes an A-type heat sink single sheet (18); Different from the flow-blocking guide peaks (6) on the groove-shaped large plane (14) of the heat dissipation monolith (2), all of them are straight arcs (16), and their combination constitutes a B-type heat dissipation monolith (19).

3. A non-active three-dimensional through-cavity uniformly mixed turbulent flow heat sink for a radiator according to claim 1, characterized in that a plurality of heat sinks (1) with an air-side turbulent structure (12) and an oil-side mixing flow structure (13) are arranged with a spacing between the fins to form an air-side mixing flow field (20) on the outside of the heat sink (1) and an oil-side mixing flow field (21) on the inside.

4. The method for manufacturing a passive three-dimensional through-cavity uniformly mixed turbulent flow heat sink for a radiator according to claim 1, characterized in that: The plate material of the heat sink (1) is a steel or aluminum thin plate, which is processed into a pair of valley-shaped upper roller dies (22) and a peak-shaped lower roller dies (23) according to the pattern shape of a plurality of flow dividing grooves (5) and flow blocking guide peaks (6) distributed on a groove-shaped large plane (14) of a heat sink single plate (2); and then processed into a corresponding flat plate die according to the pattern shape of a flow dividing and converging cavity (4) with an oil inlet and outlet (3); When the valley-shaped upper roller die (22) and the peak-shaped lower roller die (23) are fully meshed, the shaft end keyway position (24) is determined, and the shaft end keyway position (24) and the meshing position (25) thereof are on the vertical center line position; the upper roller die gear (26) and the lower roller die gear (27) are fully meshed to determine the gear keyway position (28), and the gear keyway position (28) and the meshing position (25) thereof are on the vertical center line position; by determining the shaft gear keyway position (28) and the shaft end keyway position (24), the valley-shaped upper roller die (22) and the peak-shaped lower roller die (23) on the roller die are pressed together, and the upper roller die gear (26) and the lower roller die gear (27) are meshed to meet the roller die rolling conditions; First, the valley-shaped upper roller die (22) and the peak-shaped lower roller die (23) are separated in a non-working state to ensure that the width of the gap between the maximum outer diameters of the two roller dies is greater than the thickness of the sheet material and is sufficient for the sheet material to pass through; then, a rotational force is applied to the shaft end (29) of the valley-shaped upper roller die (22), and the peak-shaped lower roller die (23) is rotated through the lower roller die gear (27); an upward pressure is applied to the two shaft ends (29) of the peak-shaped lower roller die (23) to press the two roller dies together, and the flat sheet material is pressed between the valley-shaped upper roller die (22) and the peak-shaped lower roller die (23). ) is rotated and pressed together. When rolling to the branch flow cavity (4), a branch flow cavity position (30) is reserved on the flat plate. At this time, the upper roller die gear (26) and the lower roller die gear (27) are kept in meshing, and the relative pressure applied to the two shaft ends (29) of the peak-shaped lower roller die (23) is released, so that the maximum outer diameters of the valley-shaped upper roller die (22) and the peak-shaped lower roller die (23) are separated, and the gap width between the maximum outer diameters of the valley-shaped upper roller die (22) and the peak-shaped lower roller die (23) should be greater than the thickness of the flat plate, so that the branch flow cavity position on the flat plate is (30) is transported to the flat die pressing and forming position (31) of the diverting and converging chamber (4) without being rolled by the valley-shaped upper roller die (22) and the mountain-shaped lower roller die (23), and the diverting and converging chamber (4) and the mixing chamber (7) are pressed to connect the two end parts in the length direction. During the above process, the upper roller die gear (26) and the lower roller die gear (27) at the shaft end (29) of the paired roller die are always in the meshing state (32) during rolling and the gear meshing state (33) when the rollers are separated, so as to complete the heat dissipation single piece (2), the A-type heat dissipation single piece (18) or the B-type heat dissipation single piece (18). After the single piece (19) is rolled and formed, the heat dissipation single piece (2), A-type heat dissipation single piece (18) or B-type heat dissipation single piece (19) of different types or the same type are placed opposite each other in pairs, and the peripheral weld bead (15) and the bottom plane of the diversion groove (5) are aligned on the inner side of the mixed flow chamber (7). The edges of the two heat dissipation single pieces (2), A-type heat dissipation single pieces (18) or B-type heat dissipation single pieces (19) are formed by welding. The excess material of the edges of the heat dissipation fins (1) after the welded pieces are sheared off and transferred to the next step of the heat sink (34) manufacturing process.

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