Radiator for transformer and radiating fins of radiator

Abstract

The radiator comprises the cooling fin, an oil inlet pipe and an oil outlet pipe, an oil inlet and an oil outlet which are connected with the oil inlet pipe and the oil outlet pipe are formed in the two ends of the cooling fin, the cooling fin comprises two single cooling fins, and each single cooling fin is provided with a flow dividing protrusion and a cooling area. The two cooling single pieces are folded and fixed to form an oil passing cavity, the flow dividing protrusions form flow dividing clamping channels, and cooling oil flows to the cooling areas close to the two sides of the cooling pieces preferentially after being divided through the flow dividing clamping channels. The radiating fin has the advantages that the radiating fin with the oil passing cavity is formed by the two radiating single fins, and the shunting passages for shunting the cooling oil are formed by the shunting bulges on the radiating fin, so that the cooling oil preferentially enters the radiating areas close to the two sides of the radiating fin when entering the oil passing area, the edge radiating effect is improved, heat is prevented from being accumulated in the middle, and the radiating effect is improved; in addition, the split-flow clamping channels are also beneficial for cooling oil to form vortexes in the cooling fins, the turbulence degree is enhanced, the thickness of a thermal boundary layer is reduced, and the heat dissipation effect is enhanced under the same heat dissipation area.

Description

Technical Field

[0001] The present invention relates to the technical field of radiators, and in particular to a radiator for a transformer and a heat sink thereof. Background Art

[0002] The most basic function of a transformer is to transform voltage. In the power system, the electricity generated by power stations usually has a higher voltage in order to reduce energy loss during transmission. However, this high voltage is not suitable for direct supply to users. The transformer changes the turns ratio of the coil to convert the high voltage into a low voltage suitable for users, or to increase the low voltage for long-distance transmission in the power grid.

[0003] Transformers usually generate heat during operation. A large amount of heat accumulation is dangerous, so the transformer needs to be cooled in time to ensure its smooth operation. The current mature method of cooling the transformer is to install a plate-type radiator on its case to dissipate heat.

[0004] The existing plate radiator is composed of a plurality of spaced radiating fins, which are connected to the radiating fins through oil inlet and outlet pipes. A circulating cooling system is formed by passing circulating cooling oil through the oil inlet and outlet pipes to the plate radiator to achieve heat dissipation.

[0005] When the existing fin-type radiator is filled with cooling oil through the oil inlet pipe, the cooling oil will preferentially flow to the middle of the heat sink, and the heat dissipation oil path in the middle is generally a straight long strip. This results in poor oil separation of the cooling oil entering the heat sink, and most of the cooling oil flows into the heat dissipation oil path in the middle of the heat sink.

[0006] However, since the heat sinks that make up the radiator are arranged side by side, the heat of the entire radiator is accumulated in the middle. The cooling oil flowing through the sides of the heat sink located on the outside is less than that in the middle, and the heat dissipation effect is poor.

[0007] In the Chinese patent, CN200810025025.1, the name is: heat sink stepped radiator, which records that it includes an oil inlet pipe, an oil return pipe and a group of heat sinks connected between the oil inlet and return pipes for dissipating the hot oil introduced by the oil inlet pipe and then leading it to the oil return pipe. It is characterized in that the oil inlet pipe includes a horizontal pipe section and an inclined pipe section, and the inclined pipe section is bent on the horizontal pipe section; the group of heat sinks includes parallel heat sinks arranged in parallel and stepped heat sinks arranged in a stepped shape, the parallel heat sinks are connected between the horizontal pipe section and one end of the oil return pipe, and the stepped heat sinks are connected between the inclined pipe section and the other end of the oil return pipe, wherein: the horizontal pipe section is a pipe section with an oil inlet, and the inclined pipe section is a pipe section away from the oil inlet.

[0008] As shown in patent CN200810025025.1, the technical solution of the patent is to change the existing straight oil inlet pipe into a new oil inlet pipe composed of a horizontal pipe section and an inclined pipe section, so that the heat dissipation area of ​​the parallel heat sink close to the oil inlet is larger than the heat dissipation area of ​​the inclined heat sink far from the oil inlet, so as to achieve the effect of uniform flow diversion and balanced heat dissipation; the technical solution can achieve a partial flow diversion effect through the new oil inlet pipe, but the effect of achieving uniform flow diversion by relying solely on the distance from the oil inlet pipe is poor. At the same time, the change of the oil inlet pipe will lead to a change in the overall shape of the radiator. In order to adapt to the shape of the transformer, the heat sink needs to be adjusted. Heat sinks of different specifications will increase the production cost and also change the heat dissipation area; In addition, since the heat sinks that make up the radiator are arranged side by side, the uniform distribution of the heat dissipation oil will cause the heat of the entire radiator to accumulate in the middle, while the temperature at the edge is lower and the heat dissipation effect is poor. Summary of the invention

[0009] The technical problem to be solved by the present invention is that the existing transformer radiator mentioned in the background technology has poor cooling oil diversion effect and poor heat dissipation effect during use.

[0010] In view of the above technical problems, a heat sink constituting a radiator is proposed; the heat sink is realized by the following technical scheme: a heat sink comprising two heat sinks, which are fixed on all sides after being closed, and an oil passage cavity is formed between the two heat sinks; the heat sink comprises a body, and a welding skirt protruding toward the back side of the body is arranged around the body; the two surfaces of the body are divided into a front side and a back side, and the two heat sinks are symmetrically closed, and the welding skirts are aligned and fitted, and then welded to form a welding portion, and the two end areas along the length direction on the front side of the body are diversion areas, and the rest are oil passage areas, and the two diversion areas are provided with diversion protrusions concave toward the back side of the body to form a diversion channel, and the diversion protrusions are arranged along the width direction of the heat sink, and a diversion channel is formed between the diversion protrusions after the two heat sinks are symmetrically closed; The oil-passing area is divided into a plurality of heat dissipation zones arranged at intervals along the width direction of the body, and there is a distance between the two outermost heat dissipation zones and the welding skirt; the cross section of the body of each heat dissipation zone is wavy; The flow-dividing protrusion comprises an arc segment and straight segments symmetrically distributed at two ends. The center of the arc segment is coaxially connected with the centers of the oil inlet and the oil outlet, and the straight segment is transitionally connected with the arc segment.

[0011] Preferably, the diverter channel has a gradually expanding structure, and the diverter channel gradually expands from the middle to both ends, so that the diverter protrusion forming the diverter channel has the largest protrusion height in the middle of the arc section and the smallest protrusion height at the end of the straight section; the straight section is inclined in the length direction of the heat sink, and the inclination angle is α, and the range of α is 0-10°. This arrangement makes it easy for the diverter channel formed by the diverter protrusion to divert and guide the cooling oil, thereby improving the heat dissipation effect.

[0012] Preferably, the length of the diverter protrusion is one-half to two-thirds of the width of the heat sink. This arrangement facilitates the diverter channel formed by the diverter protrusion to divert and guide the cooling oil, thereby improving the heat dissipation effect.

[0013] Preferably, the interval between two adjacent heat dissipation areas is a connecting portion, and the connecting portion is a connecting protrusion that is concavely opened on the back of the main body. After the two heat dissipation sheets are closed, all the connecting protrusions correspond to each other one by one, are attached and fixed, and the fixing surface is a plane. Such an arrangement improves the stability of the connection after the heat dissipation sheets are closed.

[0014] Preferably, the end of the heat dissipation zone body with a wavy cross-section extends to the diversion area, and the distribution direction of the two ends of the heat dissipation zone body is set as the shape of the diversion protrusion changes. Such a setting facilitates the cooling oil to enter the heat dissipation zone for heat dissipation, and also reduces the impact of the heat dissipation oil on the heat dissipation zone structure, preventing the heat sink from being damaged due to long-term impact.

[0015] The present invention also discloses a radiator for a transformer composed of radiating fins, which is realized by the following technical scheme: the radiator comprises an oil inlet pipe, an oil outlet pipe, a plurality of connecting rods and a plurality of radiating fins, the plurality of radiating fins are arranged side by side at intervals and fixed by a plurality of connecting rods to form a radiator body, and the connecting rods are distributed at the edges of the upper and lower ends of the radiator body; An oil inlet pipe is fixed on all the oil inlets of the radiator body, and the cooling oil enters the oil cavity through the oil outlet opened on the oil inlet pipe and the oil inlet on the radiator fin; An oil outlet pipe is fixed on all the oil outlets of the radiator body, and the cooling oil in the oil cavity flows into the oil outlet pipe through the oil outlet.

[0016] Preferably, the spacing between adjacent heat sinks is 1.9-2.2 times the thickness W of the heat sink, and such a setting facilitates heat dissipation by the heat sink.

[0017] Preferably, a plurality of reinforcing ribs for fixing the radiator are welded on the side of the radiator, the reinforcing ribs are round steel, a welding plane is cut along the length direction of the reinforcing ribs, the cross section of the welding portion on the heat sink is rectangular, the welding plane of the reinforcing ribs and the side welding of the welding portion are welded, and the welding portion is cross-shaped or X-shaped; both ends of the reinforcing ribs are chamfered, and the arrangement of the reinforcing ribs improves the stability of the radiator.

[0018] Preferably, the connecting rod is round steel, a welding plane is cut along the length direction of the connecting rod, the cross-section of the welding part on the heat sink is rectangular, the welding plane of the connecting rod is welded to the side of the welding part, and the welding part is cross-shaped; the two ends of the connecting rod are chamfered, and this arrangement increases the contact area between the connecting rod and the side of the radiator, and improves the stability of the fixing of the connecting rod and the reinforcement ribs.

[0019] Preferably, the reinforcing ribs are arranged on both sides of the radiator, and the inclination angles of the reinforcing ribs arranged on both sides of the radiator are opposite. Such an arrangement improves the stability of the reinforcing ribs in fixing the radiator.

[0020] Compared with the prior art, the present invention has the following beneficial effects: The technical solution of the present invention utilizes two heat dissipation sheets that are closed and welded together to form a heat sink with an oil passage chamber, utilizes diversion protrusions arranged at both ends of the heat sink to form a diversion channel for diverting the cooling oil, and utilizes diversion channels with different cross-sectional areas at different positions to divert the cooling oil entering the oil inlet, so that the cooling oil, when entering the oil passage area, preferentially enters the heat dissipation areas close to the two sides of the heat sink, and then enters the heat dissipation area close to the middle, thereby improving the heat dissipation effect at the edge, thereby improving the heat dissipation effect of the heat sink as a whole. In addition, the provision of the diversion channel also helps the cooling oil to form a vortex in the heat sink, disrupting the originally ordered thermal boundary layer structure, enhancing the degree of turbulence, thereby reducing the thickness of the thermal boundary layer, further improving the heat transfer effect, and further enhancing the heat dissipation effect under the same heat dissipation area. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is the front view of the heat dissipation chip; Figure 2 is a three-dimensional schematic diagram of a heat sink; Figure 3 It is a partial cross-sectional view of the heat sink; Figure 4 for Figure 3 Enlarged view of point A in the middle; Figure 5 for Figure 3 Enlarged view of point B in the middle; Figure 6 This is a cross-sectional view of the diversion channel; Figure 7 It is a cross-sectional view of the heat dissipation area; Figure 8 is a three-dimensional schematic diagram of a radiator; Fig. 9 It is a three-dimensional schematic diagram of the oil outlet pipe; Explanation of the accompanying drawings: 1-heat dissipation single piece, 11-welding skirt, 12-diverter area, 13-oil passing area, 14-oil pipe welding plate, 2-diverter protrusion, 21-arc segment, 22-straight segment, 3-diverter channel, 4-heat dissipation area, 41-connecting protrusion, 42-heat dissipation expansion slot, 5-oil inlet pipe, 6-oil outlet pipe, 61-oil outlet, 62-lifting ear, 63-flange connecting plate, 7-radiator, 71-reinforcement rib, 8-oil inlet, 9-oil outlet. DETAILED DESCRIPTION

[0022] The following will be combined with the attached embodiment of the present invention Figure 1-9 , the technical solutions in the embodiments of the present invention are described in detail.

[0023] Example

[0024] like Figure 1 , 3 As shown in FIG. 8 , a heat sink for a transformer includes a plurality of heat sinks 7 connected side by side through an oil inlet pipe 5 and an oil outlet pipe 6, each heat sink includes two heat sink monoliths 1 that are closed and welded together, a heat sink area 4 for cooling oil circulation is provided in the middle of the heat sink monolith 1, and a diversion protrusion 2 is also provided on the heat sink monolith 1. When the two heat sink monoliths 1 are symmetrically closed, a diversion channel 3 is formed between the diversion protrusions 2. After the cooling oil is diverted through the diversion channel 3, it preferentially enters the heat sink area 4 on both sides of the heat sink for heat dissipation, thereby improving the heat dissipation effect.

[0025] The main function of the heat dissipation sheet 1 is to be closed to form a heat dissipation fin for heat dissipation. At the same time, the heat dissipation fin composed of the heat dissipation sheet 1 serves as a heat dissipation base and a carrier for the circulation of cooling oil.

[0026] The main function of the diversion protrusion 2 is to form a diversion channel 3 for diverting the cooling oil after the heat dissipation single sheet 1 is closed. Under the action of the diversion channel 3, the cooling oil preferentially flows into the heat dissipation area 4 close to the two sides of the heat dissipation plate. The setting of the diversion channel 3 also helps the cooling oil to form a vortex in the heat sink, disrupting the originally orderly thermal boundary layer structure, enhancing the degree of turbulence, thereby reducing the thickness of the thermal boundary layer, further improving the heat transfer effect, and further enhancing the heat dissipation effect under the same heat dissipation area.

[0027] like Figure 1 , 2 As shown in , 3, 4 and 5, the heat sink 1 is a rectangular metal sheet stamped from a metal material. In this embodiment, it is preferably made of stainless steel. The two surfaces of the heat sink 1 are the front and back surfaces, respectively. The back surface forms an oil passage cavity for cooling oil to flow through after the two heat sinks 1 are closed.

[0028] The heat sink 1 includes a main body, on which a welding skirt 11, a diverter area 12 and an oil passing area 13 are arranged, wherein the welding skirt 11 is located around the heat sink 1, the diverter area 12 is located at both ends of the heat sink 1, and the oil passing area 13 is located in the middle of the heat sink 1 between the two diverter areas 12.

[0029] Regarding the closing and welding of the heat sink sheets 1 into a heat sink, the two heat sink sheets 1 are aligned and fitted, that is, the back sides of the welding skirts 11 on the heat sink sheets 1 are in contact, and then the welding skirts 11 on the two heat sink sheets 1 are welded at the edges to form a welding portion, and after the two heat sink sheets 1 are welded, an oil cavity is formed on the back side of the heat sink sheets 1.

[0030] The main function of the diversion area 12 is to cooperate with the diversion protrusion 2 to achieve the diversion of the cooling oil. The main function of the oil passing area 13 is to circulate the diverted cooling oil to achieve cooling and heat dissipation.

[0031] In order to facilitate the production of two identical diversion areas 12, the diversion area 12 is extended from the same cross-section. This arrangement allows only the middle oil-passing area 13 of the stamping die to be extended when producing heat sinks 1 of different specifications, and the die for stamping the diversion area 12 does not need to be changed, thereby reducing production costs.

[0032] Regarding the distribution relationship of the welding skirt 11 on the body of the heat sink 1, the welding skirt 11 and the body are stamped integrally, and the welding skirt 11 is located around the body and protrudes relative to the back of the body, that is, the back of the welding skirt 11 protrudes from the back of the body.

[0033] In order to facilitate the entry and exit of cooling oil, an arc-shaped notch is opened in the diversion area 12 at both ends of the heat sink 1. The notch on the heat sink 1 forms an oil inlet 8 and an oil outlet 9 respectively after the two heat sinks 1 are closed to form a heat sink. On the surface of the heat sink 1, near the oil inlet 8 and the oil outlet 9, an arc-shaped metal sheet is bent outward perpendicular to the front of the heat sink 1. This metal sheet is named an oil pipe welding sheet 14. The oil pipe welding sheet 14 is perpendicular to the front of the heat sink 1, and the arc inner diameter of the oil pipe welding sheet 14 is the same as the inner diameter of the oil inlet 8 and the oil outlet 9.

[0034] In order to facilitate the circulation of cooling oil and facilitate the cooling oil to flow downward from the diverter area 12 into the oil passing area 13, the end of the heat sink 1 and the two sides of the oil inlet 8 and the oil outlet 9 are tilted, that is, the two sides of the oil inlet 8 or the oil outlet 9 on the diverter area 12 are tilted toward the vertical direction of the heat sink, and the tilt angle is preferably 7.5°.

[0035] Definition: In this embodiment, the direction from the oil inlet 8 to the oil outlet 9 on the front of the heat sink is the length direction, and the corresponding vertical distribution direction is the width direction. On the heat sink, the dimension in the length direction is greater than the dimension in the width direction. After the heat sink sheets 1 are closed to form a heat sink, the distance between the front sides of the two heat sink sheets 1 is the thickness W of the heat sink.

[0036] In order to increase the heat dissipation effect of the oil-passing area 13 , a plurality of heat dissipation zones 4 are evenly distributed on the oil-passing area 13 along the width direction of the heat dissipation sheet 1 . In this embodiment, 7 heat dissipation zones 4 are preferably provided.

[0037] like Figure 5 and 7 As shown, each heat dissipation zone 4 is composed of a plurality of heat dissipation expansion slots 42, and the heat dissipation expansion slots 42 are semi-arc grooves, and the heat dissipation expansion slots 42 are perpendicular to the front side of the heat dissipation monolithic plate 1 and are concave, and the heat dissipation expansion slots 42 are distributed at intervals in the heat dissipation zone 4. Because the heat dissipation monolithic plate 1 is formed by stamping, and the cross section of the heat dissipation expansion slots 42 is an arc, the stamping contours of adjacent heat dissipation expansion slots 42 are arc-shaped transitions, so that the cross section of the body of the heat dissipation zone 4 composed of the heat dissipation expansion slots 42 is wavy, as shown in FIG. Figure 7 As shown, such a configuration increases the cooling area and improves the heat dissipation effect under the same width of the heat dissipation single plate 1.

[0038] In order to improve the heat dissipation efficiency, the present embodiment preferably optimizes the layout of each heat dissipation zone 4 to include 5 heat dissipation expansion slots 42. Compared with the configuration of 2 or 3 heat dissipation expansion slots commonly used on the current traditional heat sink, the present embodiment introduces 5 heat dissipation expansion slots 42 to form the heat dissipation zone 4. This innovative design expands the expansion area of ​​the heat dissipation zone 4. Under the premise of keeping the width of the heat dissipation single chip 1 unchanged, this change effectively increases the contact area between the cooling oil and the heat dissipation single chip 1, thereby further enhancing the overall heat dissipation performance.

[0039] In addition, in order to prevent the heat dissipation area 4 on the heat dissipation monolith 1 from overlapping at the contact point with the welding skirt 11 and affecting the sealing effect of the welding skirt 11, a spacing is left between the two heat dissipation areas 4 on both sides of the heat dissipation monolith 1 and the welding skirt 11, and the size of this spacing is preferably 7 mm.

[0040] In order to ensure the circulation of cooling oil, the depth of the concave heat dissipation expansion slot 42 is less than half the width of the heat sink, so that after the heat dissipation single sheet 1 is closed, the heat dissipation expansion slots 42 on the two heat dissipation single sheets 1 do not touch each other, which is convenient for the circulation of cooling oil.

[0041] In order to improve the stability of the heat sink formed by folding the heat sink sheets 1, a plurality of connecting parts are further provided on the oil-passing area 13. The connecting parts are connecting protrusions 41 concavely opened on the back of the heat sink sheet 1. Preferably, six connecting protrusions 41 are provided on the heat sink sheet 1, and the six connecting protrusions 41 separate the seven heat dissipation areas 4.

[0042] The connecting protrusion 41 is a rectangular plane, and the connecting protrusion 41 is arranged along the length direction of the heat sink 1. The connecting protrusion 41 is perpendicular to the front side of the heat sink 1 and protrudes toward the back side, and the height of the protrusion is half of the width W of the heat sink, that is, the protruding surface of the connecting protrusion 41 is flush with the back side of the welding skirt 11, so that when the heat sink 1 is closed to form a heat sink, the protruding surfaces of the connecting protrusions 41 on the two heat sinks 1 fit together. Figure 7 shown.

[0043] The setting of the connecting protrusion 41 makes the connecting protrusions 41 on two heat dissipation sheets 1 contact each other when the heat dissipation sheets 1 form a heat sink, thereby improving the stability of the heat sink after closing. At the same time, the connecting protrusion 41 also isolates the heat dissipation areas 4 from each other, preventing the cooling oil from generating a thick thermal boundary layer when flowing in the oil passage cavity, thereby improving the heat dissipation effect and enhancing the heat dissipation capacity.

[0044] In order to reduce production costs, the ends of the heat dissipation expansion groove 42 and the connecting protrusion 41 are both located in the diversion area 12. In this way, when producing heat dissipation sheets 1 of different lengths, it is only necessary to extend the oil-passing area 13 of the middle cross-sectional shape of the stamping die, and the die for stamping the diversion area 12 does not need to be changed, thereby reducing production costs.

[0045] like Figure 1 , 2 As shown in , 4 and 6, in order to reasonably divert the cooling oil entering the oil chamber through the oil inlet 8 and prevent heat accumulation in the middle of the heat sink, a diversion protrusion 2 is provided at the diversion area 12 on the heat sink monolithic sheet 1. After the heat sink monolithic sheets 1 are closed to form a heat sink, the diversion protrusions 2 on the two heat sink monolithic sheets 1 form a diversion channel 3 in the oil chamber, and the cooling oil entering the oil chamber is diverted through the diversion channel 3, so that the cooling oil preferentially flows to the heat dissipation areas 4 on both sides of the heat sink.

[0046] The diverter protrusion 2 is arranged at the diverter area 12 on the heat sink 1. The diverter protrusion 2 is perpendicular to the front side of the diverter area 12 and protrudes toward the back side. The diverter protrusion 2 includes an arc segment 21 and a straight line segment 22. The center point of the arc segment 21 is coaxial with the center point of the oil inlet 8 or the oil outlet 9. The straight line segment 22 has two ends respectively located at the arc segment 21. In order to prevent the heat sink 1 from being damaged by the impact of the cooling oil when the cooling oil is flowing, the straight line segment 22 and the arc segment 21 have a smooth transition at the connection.

[0047] In addition, in order to facilitate the drainage of cooling oil, the straight section 22 of the diverter protrusion 2 is inclined, that is, the straight section 22 is inclined toward the length direction of the heat sink 1, and the inclination angle α is in the range of 0-10°, and is preferably 7° in this embodiment.

[0048] In order to further enhance the diversion effect of the diversion channel 3 formed by the diversion protrusion 2 on the cooling oil, the heights of the arc segment 21 and the straight segment 22 in the diversion protrusion 2 are different, that is, the protrusion height in the middle of the arc segment 21 is the largest, and the protrusion height gradually decreases from the middle of the arc segment 21 to both ends, and the protrusion height of the straight segment 22 is the highest at the connection with the end of the arc segment 21, and gradually decreases toward the other end. Such an arrangement makes the diversion channel 3 composed of the diversion protrusion 2 gradually expand from the middle to the two ends in a trumpet shape. In this embodiment, the narrowest size in the middle is preferably 2 mm, and the widest size at the end is 4 mm, so that the cooling oil can preferentially flow to the heat dissipation area 4 on both sides of the heat sink.

[0049] The length of the diverter protrusion 2 on the heat dissipation monolithic sheet 1 accounts for one half to two thirds of the width of the heat dissipation monolithic sheet 1 . In this embodiment, the length of the diverter protrusion 2 preferably accounts for two thirds of the heat dissipation monolithic sheet 1 .

[0050] In order to facilitate the flow of cooling oil into the heat dissipation zone 4 and improve the heat dissipation effect, the heat dissipation zone 4 composed of the heat dissipation extension grooves 42 is distributed on the heat dissipation monolithic sheet 1 relative to the diverter protrusion 2, that is, the distribution direction of the end of the heat dissipation zone 4 on the heat dissipation monolithic sheet 1 changes with the shape of the diverter protrusion 2, and the distance between the end of the heat dissipation extension grooves 42 constituting the heat dissipation zone 4 and the diverter protrusion 2 is the same as the distance between the diverter protrusion 2 and the oil inlet 8 or the oil outlet 9.

[0051] Regarding the diversion of the cooling oil by the diversion channel 3 formed by the diversion protrusion 2, when the cooling oil enters the heat sink through the oil inlet 8, the cooling oil directly flows to the arc section 21 of the diversion protrusion 2 coaxial with the center of the circle. Since the gap of the diversion channel 3 is narrowest at the middle of the arc section 21, a part of the cooling oil will flow to the corresponding heat dissipation area 4 through the narrowest part, but more will flow to the heat dissipation area 4 at both ends of the heat sink along the gradually expanding structure of the diversion channel 3, that is, the diversion channel 3 formed by the diversion protrusion 2 diverts and guides the cooling oil, so that more cooling oil enters the heat dissipation area 4 on both sides of the heat sink, and also plays a role in that the cooling oil preferentially flows to the heat dissipation area 4 on both sides of the heat sink. In addition, the provision of the diversion channel 3 also helps the cooling oil to form a vortex in the heat sink, disrupting the originally orderly thermal boundary layer structure, enhancing the degree of turbulence, thereby reducing the thickness of the thermal boundary layer, further improving the heat transfer effect, and further enhancing the heat dissipation effect under the same heat dissipation area; When multiple heat sinks are arranged side by side to form a radiator 7, the middle of the heat sink is located in the middle of the radiator 7, where the heat exchange with the outside is the slowest, while the two sides of the heat sink are close to the outside and have a faster heat exchange with the outside. The setting of the diverter channel 3 reduces the problem of heat accumulation in the middle of the heat sink, improves the heat dissipation effect on both sides of the heat sink, improves the heat dissipation capacity of a single heat sink, and also improves the overall heat dissipation effect of the radiator 7.

[0052] like Figure 2 ,8 As shown in FIG. 9 , the radiator 7 includes a plurality of radiating fins connected side by side through an oil inlet pipe 5 and an oil outlet pipe 6 , and connecting rods and reinforcing ribs 71 for fixing the radiating fins constituting the radiator 7 .

[0053] The oil inlet pipe 5 and the oil outlet pipe 6 are metal pipes with circular cross-sections. One end of the oil inlet pipe 5 and the oil outlet pipe 6 is open and the other end is closed. The main function of the oil inlet pipe 5 is to serve as a channel for cooling oil to enter the radiator 7, and the main function of the oil outlet pipe 6 is to serve as a channel for cooling oil to flow out. The cooling oil enters the multiple heat sinks that constitute the radiator 7 through the oil inlet pipe 5, and after the heat is dissipated by the heat sinks, the cooling oil flows out through the oil outlet pipe 6.

[0054] Definition: In this embodiment, one end of the radiator 7 installed on the oil inlet pipe 5 is the upper end, and the other end opposite to it is the lower end. The front of the heat sink constituting the radiator 7 is still the front of the radiator 7, and the surface on the radiator 7 corresponding to the side of the heat sink is the side surface.

[0055] In order to facilitate the connection between the oil inlet pipe 5 and the oil outlet pipe 6 and the heat sink of the group radiator 7, the outer diameter of the oil inlet pipe 5 and the oil outlet pipe 6 is the same as the diameter of the oil pipe welding plate 14, and the oil pipe welding plate 14 fits the arc-shaped outer surface of the oil inlet pipe 5 and the oil outlet pipe 6 and is welded together.

[0056] In order to facilitate the cooling oil to flow into the heat sink through the oil inlet pipe 5 or flow from the heat sink to the oil outlet pipe 6, a plurality of arc-shaped notches are provided on the arc-shaped surfaces of the oil inlet pipe 5 and the oil outlet pipe 6, perpendicular to the arc-shaped surfaces. These notches are named oil outlets 61. The oil outlet 61 on the oil inlet pipe 5 corresponds to the oil inlet 8 on the heat sink, and the oil outlet 61 on the oil outlet pipe 6 corresponds to the oil outlet 9 on the heat sink. The plurality of oil outlets 61 on the oil inlet pipe 5 and the oil outlet pipe 6 are distributed at intervals, and the interval distance is the distance between the two heat sinks, preferably within the range of 1.9-2.2 times the thickness W of the heat sink.

[0057] Regarding the arrangement of the heat sinks, multiple heat sinks are arranged side by side in sequence, that is, the front sides of adjacent heat sinks correspond to each other, and the spacing between adjacent heat sinks is 1.9-2.2 times the thickness W of a single heat sink. In this embodiment, 2 times the thickness is preferably used.

[0058] In order to facilitate the connection of the radiator 7 with the external transformer, the oil inlet pipe 5 is in an inverted "L" shape, that is, the horizontal section of the oil inlet pipe 5 is connected to the oil inlet 8 at the upper end of the heat sink constituting the radiator 7, and the vertical section is located on the front side of the radiator 7, bent in the length direction of the radiator 7, and the end of the bent section is open, which is convenient for connection with the transformer.

[0059] In order to connect the oil inlet pipe 5 and the oil outlet pipe 6, a rectangular metal plate is welded at the open ends of the oil inlet pipe 5 and the oil outlet pipe 6. This metal plate is named flange connecting plate 63. A mounting hole is opened on the flange connecting plate 63. The oil inlet pipe 5 and the oil outlet pipe 6 are connected to the transformer by screws using the flange connecting plate 63. In order to facilitate the circulation of cooling oil, a circular clearance hole is opened in the middle of the mounting surface of the flange connecting plate 63.

[0060] Regarding the cooling process of the external transformer by the radiator 7, the oil inlet pipe 5 and the oil outlet pipe 6 on the radiator 7 are connected to the transformer by screws using the flange connecting plate 63. The cooling oil in the transformer enters each heat dissipation monolith 1 in the radiator 7 through the oil inlet pipe 5. After the cooling oil is dissipated and cooled by the heat dissipation monolith 1, it flows out from the oil outlet pipe 6 and enters the transformer to cool the transformer.

[0061] In order to facilitate the installation of the radiator 7 , two rectangular hanging ears 62 are respectively connected in the middle of the outer arc surfaces of the oil inlet pipe 5 and the oil outlet pipe 6 , and the hanging ears 62 are distributed at intervals on the oil inlet pipe 5 and the oil outlet pipe 6 .

[0062] In order to improve the stability of the radiator 7, connecting rods are welded at both ends of the radiator 7. The connecting rods are metal rods with a circular cross-section. The connecting rods are welded to the sides of the two ends of the radiator 7, and are welded on the left and right sides. Each heat sink that makes up the radiator 7 is welded to the connecting rod. In this way, when the oil inlet pipe 5 and the oil outlet pipe 6 are welded to the heat sink, the stability of the radiator 7 is improved through the connecting rods.

[0063] In order to further improve the stability of the radiator 7, reinforcing ribs 71 are welded on the side of the radiator 7. The reinforcing ribs 71 are round metal rods. The reinforcing ribs 71 are welded on two side surfaces of the radiator 7, and multiple ribs are welded on each side. In this embodiment, there are preferably four ribs, and the four reinforcing ribs 71 are obliquely distributed on the side of the radiator 7, that is, the reinforcing ribs 71 are oblique ribs. In this embodiment, adjacent reinforcing ribs 71 are preferably welded at sharp angles, and the four reinforcing ribs 71 are welded in pairs in a "V" shape.

[0064] In order to further improve the stability of the radiator 7, the ribs 71 on both sides of the radiator 7 are welded at opposite inclination angles. For example, the lowest rib 71 on the left side of the radiator 7 is inclined from bottom to top, while the lowest rib 71 on the right side is inclined from top to bottom.

[0065] In order to improve the stability of welding the connecting rod and the reinforcement rib 71 on the side of the radiator 7 and facilitate welding, a rectangular platform is cut on the end face of the connecting rod and the reinforcement rib 71 along the extension direction of the connecting rod and the welding skirt 11, or pressure is applied to the circular reinforcement rib 71 and the connecting rod through an extrusion device so that the contact between the connecting rod and the reinforcement rib 71 and the radiator 7 is rectangular. This increases the area of ​​the welding surface, facilitates welding, and also improves the stability of welding.

[0066] In order to prevent the connecting rod and the reinforcing rib 71 from rusting, the ends of the connecting rod and the reinforcing rib 71 are chamfered.

[0067] The production process of the transformer heat sink in this embodiment specifically includes the following steps: Step 1: Install the rolled stainless steel material on the punching machine; Step 2: The stamping equipment is started to stamp out the shape of the heat dissipation sheet 1 on the stainless steel sheet; Step 3: The cutting machine cuts and slices the stamped heat sink 1 onto the turning bed (the front of the heat sink 1 faces upward), and then the turning bed drives the heat sink 1 to turn 180 degrees, so that the back of the heat sink 1 faces upward, waiting for the next heat sink 1 to be transported to the turning bed. When the second heat sink 1 enters the turning bed, the chain drives the pushing device to move, and pushes the two heat sinks 1 to the resistance welding machine (the backs of the two heat sinks 1 correspond at this time); Step 4, the resistance welding machine receives two heat sinks 1, and uses an alignment mechanism to align the two heat sinks 1, and then multiple welding heads on the welding machine weld at the connecting protrusion 41. During this process, the pusher mechanism moves in coordination, which facilitates the resistance welding machine to weld multiple welding points at intervals on the surface of the connecting protrusion 41, and weld the two heat sinks 1 together. The welding here is then the pusher mechanism pushes the two heat sinks 1 to continue to move toward the edge banding machine; Step 5, when arriving at the edge banding machine, the edge banding machine welds the welding skirts 11 on both sides of the two heat dissipation sheets 1 to complete the edge banding of the heat dissipation sheets 1, and then moves the two heat dissipation sheets 1 to the pressing device, and the pressing device presses the unwelded welding skirts 11 at both ends of the two heat dissipation sheets 1 to correct the deformation, and then uses the welding machine here to weld the welding skirts 11 at the ends of the pressed heat dissipation sheets 1. At this time, the two heat dissipation sheets 1 form a heat sink, and then the pushing mechanism drives the heat sink to move to the cutting machine; Step 6: The cutting machine cuts off the burrs on the edge of the heat sink, and then uses the pushing mechanism to push the heat sink into the straightening machine. After the straightening machine straightens the heat sink, the production of a single heat sink is completed. At this time, the heat sink is transported to the assembly area, and multiple heat sinks are assembled into a heat sink 7; Step 7, on the assembly bed, arrange multiple heat sinks vertically and spaced apart. During this process, align the ends and both sides of the heat sinks. Then, spot weld the pre-welded oil inlet pipe 5 and oil outlet pipe 6 to the oil pipe welding pieces 14 at the oil inlet port 8 and the oil outlet port 9, respectively. During this process, the oil outlet 61 on the oil inlet pipe 5 is aligned with the oil inlet port 8, and the oil outlet 61 on the oil outlet pipe 6 is aligned with the oil outlet port 9; Step 8, welding the connecting rod and the reinforcing rib 71, and the connecting rod and the reinforcing rib 71 are extruded before welding so that the side has a rectangular welding surface to improve the stability of welding, and at the same time, in order to prevent rust, the ends of the connecting rod and the reinforcing rib 71 are chamfered, and then the rectangular surfaces on the connecting rod and the reinforcing rib 71 are welded together with the sides of the welding parts on the multiple heat sinks, and the reinforcing rib 71 is welded at an angle during this process; Step 9, the oil inlet pipe 5 and the oil outlet pipe 6 are welded again, and the oil pipe welding piece 14 on each heat sink is completely welded with the oil inlet pipe 5 and the oil outlet pipe 6; Step 10, welding the lifting ears 62 to the oil inlet pipe 5 and the oil outlet pipe 6, thus completing the assembly of the radiator 7; Step 11, applying a pressure of 0.25 MPa to the radiator 7 from both ends of the oil inlet pipe 5 and the oil outlet pipe 6 for 30 minutes, monitoring whether there is leakage, and performing subsequent coating process after confirming that there is no leakage; Step 12: Put the monitored radiator 7 into a coating tank for rust-proof coating. After coating, wait for drying. After drying, the production of the radiator 7 is completed.

[0068] The above embodiments are only for illustrating the technical idea of ​​the present invention, and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical solution in accordance with the technical idea proposed by the present invention shall fall within the protection scope of the present invention.

Claims

1. A heat sink, wherein two ends of the heat sink are respectively provided with an oil inlet (8) and an oil outlet (9), and an oil passage cavity is provided inside the heat sink; the characteristics are: The heat sink comprises two heat sink sheets (1), which are fixed around the periphery after being closed together, and an oil passage cavity is formed between the two heat sink sheets; the heat sink sheet (1) comprises a body, and a welding skirt (11) is arranged around the body and protrudes toward the back of the body; the two surfaces of the body are divided into a front side and a back side, and the two heat sink sheets (1) are symmetrically closed together, and the welding skirts (11) are aligned and affixed, and then welded to form a welding portion, and the two end areas along the length direction of the front side of the body are diversion areas (12), and the rest are oil passage areas (13), and the two diversion areas (12) are both provided with diversion protrusions (2) concave toward the back of the body to form a diversion channel (3), and the diversion protrusions (2) are arranged along the width direction of the heat sink sheet (1), and the diversion channel (3) is formed between the diversion protrusions (2) after the two heat sink sheets (1) are symmetrically closed together; The oil-passing area (13) is divided into a plurality of heat dissipation areas (4) arranged at intervals along the width direction of the body, and a distance exists between the two outermost heat dissipation areas (4) and the welding skirt (11); the cross section of the body of each heat dissipation area (4) is wavy; The flow-dividing protrusion (2) comprises an arc segment (21) and straight segments (22) symmetrically distributed at both ends; the center of the arc segment (21) is coaxially connected to the centers of the oil inlet (8) and the oil outlet (9); and the straight segment (22) is transitionally connected to the arc segment (21).

2. The heat sink according to claim 1, characterized in that: The flow dividing channel (3) has a gradually expanding structure. The flow dividing channel (3) gradually expands from the middle to both ends, so that the flow dividing protrusion (2) of the flow dividing channel (3) has the largest protrusion height in the middle of the arc section (21) and the smallest protrusion height at the end of the straight section (22); the straight section (22) is inclined in the length direction of the heat sink, and the inclination angle is α, and the range of α is 0-10°.

3. The heat sink according to claim 1, characterized in that: The length of the diversion protrusion (2) accounts for one half to two thirds of the width of the heat dissipation sheet (1).

4. The heat sink according to claim 1, characterized in that: The interval between two adjacent heat dissipation areas (4) is a connection portion, and the connection portion is a connection protrusion (41) that is concavely opened on the back of the main body. After the two heat dissipation sheets (1) are closed, all the connection protrusions (41) correspond to each other one by one, are attached and fixed, and the fixing surface is a plane.

5. The heat sink according to claim 1, characterized in that: The end of the heat dissipation area body with a wavy cross section extends to the diversion area (12), and the distribution direction of the two ends of the heat dissipation area body is set according to the shape change of the diversion protrusion (2).

6. A heat sink for a transformer according to any one of claims 1 to 5, characterized in that: The radiator (7) comprises an oil inlet pipe (5), an oil outlet pipe (6), a plurality of connecting rods and a plurality of radiating fins, wherein the plurality of radiating fins are arranged side by side at intervals and fixed by a plurality of connecting rods to form a radiator body, wherein the connecting rods are distributed at the edges of the upper and lower ends of the radiator body; An oil inlet pipe (5) is fixed to all the oil inlet ports (8) of the radiator body, and cooling oil enters the oil chamber through the oil outlet port (61) provided on the oil inlet pipe (5) and the oil inlet port (8) on the radiator fin; An oil outlet pipe (6) is fixed to all the oil outlets (9) of the radiator body, and the cooling oil in the oil chamber flows into the oil outlet pipe (6) through the oil outlet (9).

7. The heat sink for transformer according to claim 6, characterized in that: The spacing between adjacent heat sinks is 1.9-2.2 times the thickness W of the heat sink.

8. The heat sink for transformer according to claim 6, characterized in that: A plurality of reinforcing ribs (71) for fixing the radiator (7) are welded on the side of the radiator (7); the reinforcing ribs (71) are round steel; a welding plane is cut along the length direction of the reinforcing ribs (71); the cross section of the welding portion on the heat sink is rectangular; the side of the welding portion of the welding plane of the reinforcing ribs (71) is welded; the welding portion is in a cross shape or an X shape; and both ends of the reinforcing ribs (71) are chamfered.

9. The heat sink for transformer according to claim 8, characterized in that: The connecting rod is round steel, and a welding plane is cut along the length direction of the connecting rod. The cross section of the welding part on the heat sink is rectangular. The welding plane of the connecting rod is welded to the side of the welding part, and the welding part is cross-shaped; both ends of the connecting rod are chamfered.

10. The heat sink for transformer according to claim 8, characterized in that: The reinforcing ribs (71) are arranged on both sides of the radiator (7), and the reinforcing ribs (71) arranged on both sides of the radiator (7) have opposite inclination angles.

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