Liquid cooling radiator and power supply power device using same

Abstract

The utility model provides a liquid cooling radiator and a power supply power device using the same. The liquid cooling radiator comprises a radiator body. The first heat dissipation water channel is arranged in the radiator body, one end of the first heat dissipation water channel penetrates through the water inlet and outlet end of the radiator body, a water channel inlet is formed in the water inlet and outlet end, and the other end of the first heat dissipation water channel penetrates through the blocking end, opposite to the water inlet and outlet end, of the radiator body; the second heat dissipation water channel is arranged in the radiator body, one end of the second heat dissipation water channel penetrates through the water inlet and outlet end, a water channel outlet is formed in the water inlet and outlet end, and the other end of the second heat dissipation water channel penetrates through the plugging end; the middle heat dissipation water channel is arranged in the radiator main body and is communicated between the first heat dissipation water channel and the second heat dissipation water channel; the plugging structure is plugged at the position where the first heat dissipation water channel and the second heat dissipation water channel penetrate through the plugging end; and the water inlet joint and the water outlet joint are correspondingly mounted at the water channel inlet and the water channel outlet respectively. The cooling flow channel of the liquid-cooled radiator can be formed at one time, so that processing cost is reduced and processing efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to power supply power device heat dissipation technical field, especially in a kind of liquid cooling radiator and the power supply power device for applying it. BACKGROUND

[0002] At present, power supply power device widely uses liquid cooling radiator to dissipate heat, compared with air-cooled radiator that dissipates heat by air convection, power supply power device module using liquid cooling radiator can be installed in airtight cabinet, which can improve the dustproof and waterproof effect of power supply power device module in harsh use environment and working condition.

[0003] Traditional liquid cooling radiator for power supply power device usually adopts die casting or machining forming, wherein, when die casting, die casting mold is divided into bottom plate and cover plate two parts open mold, wherein water channel groove is opened on bottom plate, then cover plate is welded on bottom plate to seal water channel groove as heat dissipation water channel;When machining forming, water channel groove is first machined on water channel bottom plate, then cover plate is welded on bottom plate to seal water channel groove as heat dissipation water channel. However, when liquid cooling radiator adopts die casting, it has the defects of high mold manufacturing cost, long welding period of cover plate and bottom plate, low processing efficiency, when it adopts machining forming, it has the defects of complicated heat dissipation water channel forming process, high processing cost, long processing period and low efficiency. SUMMARY

[0004] The utility model provides a kind of liquid cooling radiator and the power supply power device for applying it to solve the technical problems of high processing cost and low efficiency of heat dissipation water channel of traditional liquid cooling radiator for power supply power device.

[0005] To solve the above problems, the technical scheme adopted by the utility model is:

[0006] The utility model provides a kind of liquid cooling radiator, comprising:

[0007] Radiator main part;

[0008] First heat dissipation water channel, be located in the inside of radiator main part, one end of first heat dissipation water channel penetrates the inlet and outlet water end of radiator main part, and form water channel entrance at inlet and outlet water end, the other end of first heat dissipation water channel penetrates the plugging end opposite inlet and outlet water end of radiator main part;

[0009] Second heat dissipation water channel, be located in the inside of radiator main part, one end of second heat dissipation water channel penetrates inlet and outlet water end, and form water channel outlet at inlet and outlet water end, the other end of second heat dissipation water channel penetrates plugging end;

[0010] Intermediate heat dissipation water channel, be located in the inside of radiator main part and be communicated between first heat dissipation water channel and second heat dissipation water channel;

[0011] A blocking structure is arranged to block the through end of the first and second heat dissipation channels;

[0012] A water inlet joint and a water outlet joint are arranged to be installed at the water channel inlet and the water channel outlet, respectively.

[0013] Preferably, the cross sections of the first and second heat dissipation channels, the water channel inlet and the water channel outlet are circular, the other end of the first heat dissipation channel forms a first water channel opening at the through end, and the other end of the second heat dissipation channel forms a second water channel opening at the through end.

[0014] The intermediate heat dissipation channel is a connecting heat dissipation channel, one end of the connecting heat dissipation channel is connected between the first and second heat dissipation channels, the opposite end of the connecting heat dissipation channel penetrates through one side end of the radiator main body between the water inlet and outlet end and the blocking end, and the opposite end of the connecting heat dissipation channel forms a third water channel opening at the corresponding side end of the radiator main body.

[0015] The blocking structure includes a first waterproof plug, a second waterproof plug and a third waterproof plug arranged to block the first water channel opening, the second water channel opening and the third water channel opening, respectively.

[0016] Preferably, the cross sections of the first and second heat dissipation channels, the water channel inlet and the water channel outlet are rectangular or strip-shaped, the water inlet and outlet end is provided with a first opening groove covering the first and second heat dissipation channels, and the water channel inlet and outlet are formed at the bottom of the first opening groove.

[0017] The blocking end is provided with a second opening groove covering the first and second heat dissipation channels, and the intermediate heat dissipation channel is an extended heat dissipation channel connected between the ends of the first and second heat dissipation channels away from the water inlet and outlet end and connected to the bottom of the second opening groove.

[0018] The blocking structure includes a first water channel insert, the shape of the first water channel insert matches the first opening groove, the first water channel insert is embedded in the first opening groove, and the first water channel insert is provided with a water inlet through hole and a water outlet through hole matched with the water channel inlet and the water channel outlet, respectively, and the water inlet joint and the water outlet joint are arranged to be installed in the water inlet through hole and the water outlet through hole, respectively.

[0019] The second water channel insert, the shape of the second water channel insert matches the second opening groove, and the second water channel insert is embedded and blocked in the second opening groove.

[0020] Preferably, the extended heat dissipation channel includes:

[0021] A first extended water channel is arranged between the first and second heat dissipation channels, one end of the first extended water channel penetrates through the water inlet and outlet end, and the other end of the first extended water channel penetrates through the blocking end.

[0022] A first bottom channel, one end of the first bottom channel is communicated with the end of the first heat dissipation channel far from the water inlet and outlet end, the other end of the first bottom channel is communicated with the end of the first extension channel far from the water inlet and outlet end, and the first bottom channel is communicated with the first open bottom;

[0023] A second extension channel, the second extension channel is arranged between the first extension channel and the second heat dissipation channel, one end of the second extension channel penetrates the water inlet and outlet end, and the other end of the second extension channel penetrates the blocking end;

[0024] A second bottom channel, one end of the second bottom channel is communicated with the end of the first extension channel far from the blocking end, the other end of the second bottom channel is communicated with the end of the second heat dissipation channel far from the blocking end, and the second bottom channel is communicated with the first open bottom;

[0025] A third bottom channel, one end of the third bottom channel is communicated with the end of the second extension channel far from the water inlet and outlet end, the other end of the third bottom channel is communicated with the end of the second heat dissipation channel far from the water inlet and outlet end, and the third bottom channel is communicated with the second open bottom;

[0026] Preferably, the first heat dissipation channel, the first extension channel, the second extension channel and the second heat dissipation channel are arranged in parallel and at intervals, and the first bottom channel, the second bottom channel and the third bottom channel are all arranged perpendicularly to the first heat dissipation channel.

[0027] Preferably, the inner walls of the first heat dissipation channel, the second heat dissipation channel and the intermediate heat dissipation channel are provided with a convex structure.

[0028] Preferably, the heat dissipation main body is made of aluminum profile, the first heat dissipation channel, the second heat dissipation channel and the intermediate heat dissipation channel are formed by extrusion or machining, and the blocking structure is welded and sealed at the penetrating blocking end of the first heat dissipation channel and the second heat dissipation channel.

[0029] The utility model provides a kind of power supply power device, including the liquid cooling radiator of above, still including at least one power module, is installed in the outer surface of radiator main body.

[0030] Preferably, the outer surface of the heat sink body is provided with a glue filling groove, and the outer surface of the heat sink body is provided with a plurality of first screw holes corresponding to the edge of the glue filling groove.

[0031] The power module comprises: a first power module, which comprises: a first heat-conducting insulating sheet, which is covered on the outer surface of the radiator main body at the edge of the glue pouring groove, and is provided with a clearance through hole matched with the glue pouring groove and a screw through hole matched with the first screw hole; a first circuit board, which is installed on the outer layer of the first heat-conducting insulating sheet away from the radiator main body and covers the glue pouring groove, and is provided with a first screw through hole matched with the screw through hole; a transformer and a plurality of first MOS units, which are electrically connected to one side of the first circuit board away from the radiator main body.

[0032] The first circuit board and the first heat-conducting insulating sheet are fastened and installed on the radiator main body through the first connecting screw passing through the corresponding first screw through hole, screw through hole and first screw hole.

[0033] Further, the outer surface of the radiator main body is also provided with a plurality of second screw holes spaced from the glue pouring groove.

[0034] The power module further comprises: a second power module, which comprises: a plurality of second heat-conducting insulating sheets, which are installed on the outer surface of the radiator main body; a plurality of second MOS units, which are installed one by one on the outer layer of each second heat-conducting insulating sheet away from the radiator main body; a second circuit board, which is installed on the outer layer of each second MOS unit away from the radiator main body, and is provided with a second screw through hole matched with the second screw hole; a plurality of insulating pads, which are installed on one side of the second circuit board away from the radiator main body, and are provided with a screw through hole matched with the second screw through hole; and a plurality of pressing strips, which are installed one by one on the outer layer of each insulating pad away from the radiator main body, and are provided with a screw mounting hole matched with the screw through hole.

[0035] The pressing strips, insulating pads, second circuit board, second MOS units and second heat-conducting insulating sheets are fastened and installed on the radiator main body through the second connecting screw passing through the corresponding screw mounting hole, screw through hole, second screw through hole and second screw hole.

[0036] Compared with the prior art, the power module has the following beneficial effects:

[0037] The liquid cooling radiator provided by the utility model, the refrigerant heat dissipation flow channel of the liquid cooling radiator can be directly once extruded on the radiator main body by aluminum profile, the subsequent processing step of welding the water channel groove cover plate and the bottom plate of the traditional liquid cooling radiator and the die casting mold cost are saved, and the processing efficiency of the liquid cooling radiator is improved. The refrigerant heat dissipation flow channel of the liquid cooling radiator can also be directly once formed on the radiator main body by machining, and the subsequent processing step of welding the water channel groove cover plate and the bottom plate of the traditional liquid cooling radiator can also be saved, and the processing efficiency of the liquid cooling radiator is improved. The refrigerant heat dissipation flow channel can change the cross section shape and the number of branches according to actual heat dissipation requirements. BRIEF DESCRIPTION OF DRAWINGS

[0038] To more clearly illustrate the technical solution proposed by this utility model, a detailed description is provided below in conjunction with the embodiments and accompanying drawings. It should be understood that the accompanying drawings described below are merely some embodiments of this utility model, and those skilled in the art can make changes to these drawings under the concept of this utility model.

[0039] Figure 1 A three-dimensional structural schematic diagram of a first embodiment of the liquid-cooled heat sink provided by this utility model;

[0040] Figure 2 A top view of a first embodiment of the liquid-cooled radiator provided by this utility model;

[0041] Figure 3 A side view of a first embodiment of the liquid-cooled heat sink provided by this utility model;

[0042] Figure 4 for Figure 2 A cross-sectional view of the liquid-cooled radiator along the AA direction;

[0043] Figure 5 for Figure 2 A cross-sectional view of the liquid-cooled radiator along the BB direction.

[0044] Figure 6 for Figure 5 A cross-sectional view of the liquid cooling radiator with added protrusions in the first and second cooling channels.

[0045] Figure 7 A top view of a second embodiment of the liquid-cooled radiator provided by this utility model;

[0046] Figure 8 A side view of a second embodiment of the liquid-cooled heat sink provided by this utility model;

[0047] Figure 9 for Figure 7 A cross-sectional view of the liquid-cooled heat sink along the CC direction.

[0048] Figure 10 for Figure 7 A cross-sectional view of the liquid-cooled radiator along the DD direction, with the first and second cooling channels having rectangular cross-sections.

[0049] Figure 11 for Figure 10 A cross-sectional view of the first and second heat dissipation channels with added protrusions.

[0050] Figure 12 for Figure 10The cross-sectional view of the first and second heat dissipation channels is elongated.

[0051] Figure 13 for Figure 12 A cross-sectional view of the first and second heat dissipation channels with added protrusions.

[0052] Figure 14 A top view of a third embodiment of the liquid-cooled radiator provided by this utility model;

[0053] Figure 15 A side view of a third embodiment of the liquid-cooled radiator provided by this utility model;

[0054] Figure 16 for Figure 14 A cross-sectional view of the liquid-cooled heat sink along the EE direction.

[0055] Figure 17 for Figure 14 A cross-sectional view of the liquid-cooled heat sink along the FF direction;

[0056] Figure 18 An exploded view of the power device using the liquid-cooled heat sink provided by the utility model.

[0057] The main markings in the attached figures are as follows:

[0058] 1, radiator body; 10, convex structure; 11, water inlet and outlet end; 111, first open slot; 12, blocking end; 121, second open slot; 13, glue filling groove; 14, first threaded hole; 15, second threaded hole; 2, first heat dissipation water channel; 21, water channel inlet; 22, first water channel opening; 3, second heat dissipation water channel; 31, water channel outlet; 32, second water channel opening; 4, intermediate heat dissipation water channel; 41, connecting heat dissipation water channel; 411, third water channel opening; 42, extended heat dissipation water channel; 421, first extended water channel; 422, first groove bottom water channel; 423, second extended water channel; 424, second groove bottom water channel; 425, third groove bottom water channel; 5, blocking structure; 51, first waterproof plug; 52, second waterproof plug; 53, third waterproof plug; 54, first water channel insert; 541, water inlet through hole; 542, water outlet through hole; 55, second water channel insert; 6, water inlet connector; 61, water inlet hole; 7, water outlet connector; 71, water outlet hole; 8, first power module; 81, first heat-conducting insulation sheet; 811, screw through hole; 82, first circuit board; 821, first screw via hole; 83, transformer; 84, first MOS unit; 85, first connecting screw; 9, second power module; 91, second heat-conducting insulation sheet; 92, second MOS unit; 93, second circuit board; 931, second screw via hole; 94, insulating pad; 941, screw through hole; 95, pressing strip; 951, screw mounting hole; 96, second connecting screw.

[0059] In the figure, other marks are as follows:

[0060] X, first direction; Y, second direction; Z, third direction. DETAILED DESCRIPTION

[0061] In order to make the technical problems, technical solutions and beneficial effects of the utility model to be solved more clear and obvious, the following will be combined with the drawings of the utility model and embodiments to make further detailed description of the utility model. Figures 1-18

[0062] Please refer to Figures 1-17 The liquid cooling radiator provided by the utility model comprises:

[0063] ​The radiator main body 1; the first radiator water channel 2 is arranged in the radiator main body 1, one end of the first radiator water channel 2 penetrates the inlet and outlet water end 11 of the radiator main body 1, and forms the water channel entrance 21 at the inlet and outlet water end 11, the other end of the first radiator water channel 2 penetrates the blocking end 12 opposite the inlet and outlet water end 11 of the radiator main body 1; the second radiator water channel 3 is arranged in the radiator main body 1, one end of the second radiator water channel 3 penetrates the inlet and outlet water end 11 of the radiator main body 1, and forms the water channel exit 31 at the inlet and outlet water end 11, the other end of the second radiator water channel 3 penetrates the blocking end 12 of the radiator main body 1; the intermediate radiator water channel 4 is arranged in the radiator main body 1 and is communicated between the first radiator water channel 2 and the second radiator water channel 3; the blocking structure 5 is blocked at the penetrating blocking end 12 of the first radiator water channel 2 and the second radiator water channel 3; the water inlet connector 6 and the water outlet connector 7 are respectively installed at the water channel entrance 21 and the water channel exit 31.

[0064] The water inlet connector 6, the water channel entrance 21, the first radiator water channel 2, the intermediate radiator water channel 4, the second radiator water channel 3, the water channel exit 31 and the water outlet connector 7 sequentially constitute the refrigerant heat dissipation flow channel of the liquid cooling radiator, and the refrigerant introduced from the refrigerant circulating pipeline of the external refrigeration system sequentially flows through the inlet and outlet water end 11, the water channel entrance 21, the first radiator water channel 2, the intermediate radiator water channel 4, the second radiator water channel 3 and the water channel exit 31 in the radiator main body 1, and finally is discharged to the refrigerant circulating pipeline through the water outlet connector 7, so that the refrigerant circulates between the external refrigeration system and the radiator main body 1, thereby continuously exchanging heat and cooling the power device unit installed on the radiator main body 1.

[0065] Please see Figures 1-6 In the first embodiment of the liquid cooling radiator provided by the utility model,

[0066] The radiator main body 1 is in the shape of a cuboid, the direction of the longest axis of the cuboid of the radiator main body 1 is the first direction X (i.e. the length direction of the radiator main body 1), the direction of the second longest axis of the cuboid of the radiator main body 1 is the second direction Y (i.e. the width direction of the radiator main body 1), and the direction of the shortest axis of the cuboid of the radiator main body 1 is the third direction Z (i.e. the height / thickness direction of the radiator main body 1), and the above-mentioned inlet and outlet water end 11 and the blocking end 12 are respectively located at the opposite ends of the radiator main body 1 in the first direction X and serve as the head end and tail end of the liquid cooling radiator respectively; the power device is installed on the end face (i.e. the front face of the radiator main body 1) of one end of the radiator main body 1 in the third direction Z.

[0067] The first radiator water channel 2 and the second radiator water channel 3 both extend straight along the first direction X (i.e. parallel to the length direction of the radiator main body 1), and the first radiator water channel 2 and the second radiator water channel 3 are arranged left and right in the second direction Y (i.e. in the width direction of the radiator main body 1).

[0068] Please refer to Figures 1-6 In the present embodiment, the cross section of the first and second heat dissipation water channels 2 and 3 (i.e. the cross section perpendicular to the first direction X), the projection of the water channel inlet 21 and the water channel outlet 31 on the first direction X are all circular, the first heat dissipation water channel 2 forms a first water channel opening 22 at the other end of the first heat dissipation water channel 2 relative to the water channel inlet 21 through the sealing end 12 in the first direction X, the second heat dissipation water channel 3 forms a second water channel opening 32 at the other end of the second heat dissipation water channel 3 relative to the water channel outlet 31 through the sealing end 12 in the first direction X, the projection of the first and second water channel openings 22 and 32 on the first direction X are all circular.

[0069] Please refer to Figures 1-6 In the present embodiment, the above-mentioned intermediate heat dissipation water channel 4 is a connecting heat dissipation water channel 41, one end of the connecting heat dissipation water channel 41 is connected between the first and second heat dissipation water channels 2 and 3 along the second direction Y, the other end of the connecting heat dissipation water channel 41 penetrates through one side end of the radiator main body 1 between the water inlet / outlet end 11 and the sealing end 12 along the second direction Y, the opposite end of the connecting heat dissipation water channel 41 forms a third water channel opening 411 at the corresponding side end of the radiator main body 1.

[0070] Please refer to Figures 1-6 In the present embodiment, the sealing structure 5 comprises:

[0071] The first, second and third waterproof plugs 51, 52 and 53 are respectively matched with the first, second and third water channel openings 22, 32 and 411, and are respectively sealed in the first, second and third water channel openings 22, 32 and 411.

[0072] Please refer to Figures 1-6 In the preferred embodiment of the present embodiment, the above-mentioned connecting heat dissipation water channel 41 is connected between the end of the first and second heat dissipation water channels 2 and 3 close to the sealing end 12 (i.e. away from the water inlet / outlet end 11) in the first direction X, and the connecting heat dissipation water channel 41 is respectively connected to the first and second water channel openings 22 and 32.

[0073] In other embodiments of the present embodiment, the above-mentioned connecting heat dissipation water channel 41 can also be connected between any position of the first and second heat dissipation water channels 2 and 3 in the first direction X.

[0074] Please refer to Figures 1-6In the preferred embodiment of the present embodiment, the inner side walls of the first water channel opening 22, the second water channel opening 32 and the third water channel opening 411 are provided with internal threads, the outer side surfaces of the first waterproof plug 51, the second waterproof plug 52 and the third waterproof plug 53 are provided with external threads respectively corresponding to the internal threads of the first water channel opening 22, the second water channel opening 32 and the third water channel opening 411, and the first waterproof plug 51, the second waterproof plug 52 and the third waterproof plug 53 are respectively screwed and fitted with the corresponding internal threads of the first water channel opening 22, the second water channel opening 32 and the third water channel opening 411 through the external threads, so that the first waterproof plug 51, the second waterproof plug 52 and the third waterproof plug 53 are respectively plugged into the first water channel opening 22, the second water channel opening 32 and the third water channel opening 411.

[0075] For reference Figures 1-6 In the preferred embodiment of the present embodiment, the water inlet connector 6 and the water outlet connector 7 are respectively hollow circular tubes matching the shapes of the water channel inlet 21 and the water channel outlet 31, and the hollow interiors of the water inlet connector 6 and the water outlet connector 7 respectively form the water inlet hole 61 and the water outlet hole 71 corresponding to the first water channel opening 22, the first heat dissipation water channel 2 and the second water channel opening 32, the second heat dissipation water channel 3.

[0076] For reference Figures 1-6 In the more preferred embodiment of the present embodiment, the water inlet connector 6 and the water outlet connector 7 are respectively embedded in the water channel inlet 21 and the water channel outlet 31 through interference fit, and the water inlet connector 6 and the water outlet connector 7 are welded with the water inlet and outlet end 11 of the heat dissipation radiator main body 1 to seal and prevent water from entering the connection between the water inlet connector 6 and the water outlet connector 7 and the water inlet and outlet end 11, so as to avoid leakage of the refrigerant entering the first heat dissipation water channel 2 and the second heat dissipation water channel 3 from the connection between the water inlet connector 6 and the water outlet connector 7 and the water inlet and outlet end 11.

[0077] For reference Figures 7-13 In the first embodiment of the liquid-cooled heat dissipation radiator, the processing and sealing methods of the heat dissipation radiator main body 1 and the first heat dissipation water channel 2, the connecting heat dissipation water channel 41 (intermediate heat dissipation water channel 4) and the second heat dissipation water channel 3 inside the heat dissipation radiator main body 1 are as follows:

[0078] Firstly, the metal profile (preferably a metal profile with good thermal conductivity, such as an aluminum profile) is extruded through an extrusion die whose shape matches the outer contour of the heat dissipation radiator main body 1 to form the outer contour of the heat dissipation radiator main body 1.

[0079] Secondly, the heat dissipation radiator main body 1 is extruded and drilled along the first direction X through an extrusion die whose shape matches the shapes of the first heat dissipation water channel 2 and the second heat dissipation water channel 3 to process and form the water channel inlet 21, the first heat dissipation water channel 2, the water channel outlet 31, the second heat dissipation water channel 3 and the first water channel opening 22, the second water channel opening 32.

[0080] Then, the extrusion die matched with the shape of the connecting heat dissipation water channel 41 is used to extrude the drilled hole from the side end of the radiator main body 1 in the second direction Y, towards the opposite side end of the radiator main body 1 in the second direction Y, at the end close to the blocking end 12 (i.e. away from the water inlet and outlet end 11) in the first direction X, until the third water channel opening 411 and the connecting heat dissipation water channel 41 passing through the second heat dissipation water channel 3 and the first heat dissipation water channel 2 are formed in sequence.

[0081] Then, the first waterproof plug 51, the second waterproof plug 52 and the third waterproof plug 53 are screwed on the first water channel opening 22, the second water channel opening 32 and the third water channel opening 411 of the radiator main body 1 respectively, so that the first heat dissipation water channel 2, the second heat dissipation water channel 3 and the connecting heat dissipation water channel 41 are blocked, and the openings of the blocking end 12 (the tail end) and the side end of the radiator main body 1 except the water channel inlet 21 and the water channel outlet 31 of the refrigerant heat dissipation flow channel are blocked and sealed, so that the refrigerant flowing through the refrigerant heat dissipation flow channel is prevented from leaking from the openings of the radiator main body 1.

[0082] Finally, the water inlet connector 6 and the water outlet connector 7 are embedded in the water channel inlet 21 and the water channel outlet 31 respectively through interference fit, and the water inlet connector 6 and the water outlet connector 7 are welded to the water inlet and outlet end 11 of the radiator main body 1, and the assembly is completed.

[0083] In the first embodiment of the liquid cooling radiator provided by the utility model, the refrigerant heat dissipation flow channel of the liquid cooling radiator is directly extruded on the radiator main body 1 by using aluminum profile, so that the subsequent processing step of welding the water channel groove cover plate and the bottom plate of the traditional liquid cooling radiator and the cost of the die casting mold are saved, and the processing efficiency of the liquid cooling radiator is improved.

[0084] Please refer to Figures 7-13 In the second embodiment of the liquid cooling radiator provided by the utility model, the difference between the liquid cooling radiator and the first embodiment is that:

[0085] The cross section of the first heat dissipation water channel 2 and the second heat dissipation water channel 3, the projection of the water channel inlet 21 and the water channel outlet 31 in the first direction X are all rectangular or long strip-shaped (including elliptical or strip-shaped with arc at the end), and the water inlet and outlet end 11 of the radiator main body 1 is provided with a first opening groove 111 in the projection in the first direction X covering the first heat dissipation water channel 2 and the second water channel, and the water channel inlet 21 and the water channel outlet 31 are formed at the bottom of the first opening groove 111 away from the water inlet and outlet end 11 in the first direction X (i.e. close to the blocking end 12 in the first direction X).

[0086] The sealing end 12 of the radiator main body 1 is provided with a second open groove 121 in the projection in the first direction X covering the first radiator water channel 2 and the second water channel, and the intermediate radiator water channel 4 is an extended radiator water channel 42, which is communicated between the first radiator water channel 2 and the second radiator water channel 3 along the second direction Y between the end portions of the first radiator water channel 2 and the second radiator water channel 3 away from the water inlet and outlet end 11 in the first direction X (i.e. close to the sealing end 12 in the first direction X), and the extended radiator water channel 42 is communicated to the bottom of the second open groove 121 close to the water inlet and outlet end 11 in the first direction X (i.e. away from the sealing end 12 in the first direction X) on the side away from the water inlet and outlet end 11 in the first direction X (i.e. close to the sealing end 12 in the first direction X).

[0087] Please refer to Figures 6-12 In the embodiment, the sealing structure 5 comprises:

[0088] The first water channel insert 54 is matched with the shape of the first open groove 111 and is inserted into the first open groove 111, and the first water channel insert 54 is provided with a water inlet through hole 541 and a water outlet through hole 542 matched with the water channel inlet 21 and the water channel outlet 31 respectively, and the water inlet connector 6 and the water outlet connector 7 are respectively installed in the water inlet through hole 541 and the water outlet through hole 542.

[0089] The second water channel insert 55 is matched with the shape of the second open groove 121, and the second water channel insert 55 is inserted and sealed in the second open groove 121.

[0090] Please refer to Figures 7-13 In the preferred embodiment of the embodiment, the first open groove 111 and the second open groove 121 are both cuboid, and the projection of the first open groove 111 and the second open groove 121 in the first direction X is rectangular, and the shapes of the first water channel insert 54 and the second water channel insert 55 are respectively cuboid matched with the first open groove 111 and the second open groove 121.

[0091] Please refer to Figures 7-13 In the preferred embodiment of the embodiment, the first water channel insert 54 and the second water channel insert 55 are respectively welded and sealed in the first open groove 111 and the second open groove 121.

[0092] Please refer to Figures 7-13In the preferred embodiment of the present application, the first water channel insert 54 and the second water channel insert 55 are respectively welded by friction welding and sealed in the first open slot 111 and the second open slot 121, so as to seal the first heat dissipation water channel 2, the second heat dissipation water channel 3 and the extended heat dissipation water channel 42, and seal the inlet and outlet ends 11 (front end) and the sealing end 12 (rear end) of the radiator main body 1, so as to avoid the leakage of the refrigerant flowing through the refrigerant heat dissipation flow channel from the first open slot 111 and the second open slot 121 of the radiator main body 1.

[0093] Please refer to Figures 7-13 In the preferred embodiment of the present application, the water inlet connector 6 and the water outlet connector 7 are respectively embedded in the water inlet through hole 541 and the water outlet through hole 542 by interference fit, and the water inlet connector 6 and the water outlet connector 7 are welded with the first water channel insert 54 at the end of the inlet and outlet end 11, so as to seal the connection between the water inlet connector 6 and the water outlet connector 7 and the first water channel insert 54, and avoid the leakage of the refrigerant entering the first heat dissipation water channel 2 and the second heat dissipation water channel 3 from the connection between the water inlet connector 6 and the water outlet connector 7 and the first water channel insert 54.

[0094] Please refer to Figures 14-17 In the second embodiment of the liquid-cooled radiator, the processing and sealing method of the radiator main body 1 and the first heat dissipation water channel 2, the extended heat dissipation water channel 42 (intermediate heat dissipation water channel 4) and the second heat dissipation water channel 3 inside the radiator main body 1 are as follows:

[0095] Firstly, the metal profile (preferably a metal profile with good thermal conductivity, such as an aluminum profile) is extruded through an extrusion die whose shape matches the contour of the radiator main body 1, so as to form the contour of the radiator main body 1.

[0096] Secondly, a machining tool (preferably a milling cutter) whose shape matches the shape of the first heat dissipation water channel 2 and the second heat dissipation water channel 3 is used to mill a through hole in the radiator main body 1 from one end of the radiator main body 1 in the first direction X to the opposite end of the radiator main body 1 in the first direction X, so as to process the water channel inlet 21, the first heat dissipation water channel 2, the water channel outlet 31 and the second heat dissipation water channel 3.

[0097] Then, a machining tool (preferably a milling cutter) whose shape matches the shape of the first open slot 111 is used to process the first open slot 111 covering the water channel inlet 21, the first heat dissipation water channel 2, the water channel outlet 31 and the second heat dissipation water channel 3 in the radiator main body 1 from the inlet and outlet end 11 of the radiator main body 1 in the first direction X to the sealing end 12 opposite the inlet and outlet end 11 of the radiator main body 1 in the first direction X.

[0098] Then, a machining tool (preferably a milling cutter) with a shape matching the shape of the second opening groove 121 is used to machine the second opening groove 121 covering the first and second heat dissipation water channels 2 and 3 from the blocked end 12 of the radiator body 1 to the water inlet and outlet end 11 of the radiator body 1 in the first direction X; and then a machining tool (preferably a milling cutter) with a shape matching the shape of the extended heat dissipation water channel 42 is used to machine the extended heat dissipation water channel 42 connecting the ends of the first and second heat dissipation water channels 2 and 3 away from the water inlet and outlet end 11 (i.e., close to the blocked end 12 in the first direction X) from the bottom of the second opening groove 121 away from the blocked end 12 (i.e., close to the water inlet and outlet end 11) in the first direction X to the water inlet and outlet end 11 of the radiator body 1 in the first direction X.

[0099] Further, the first and second water channel inserts 54 and 55 are welded (preferably by friction welding) to the first and second opening grooves 111 and 121 of the radiator body 1, respectively, and the water inlet and outlet through holes 541 and 542 on the first water channel insert 54 are aligned with the water inlet and outlet 21 and 31, respectively.

[0100] Finally, the water inlet and outlet connectors 6 and 7 are embedded in the water inlet and outlet through holes 541 and 542, respectively, by interference fit, and the water inlet and outlet connectors 6 and 7 are welded to the first water channel insert 54 flush with the end of the water inlet and outlet end 11, completing the assembly.

[0101] In the second embodiment of the liquid-cooled radiator provided by the present application, the coolant heat dissipation flow channel of the liquid-cooled radiator is directly formed on the radiator body 1 by machining (preferably milling), eliminating the traditional subsequent processing step of welding the water channel groove cover plate and the bottom plate of the liquid-cooled radiator, thereby improving the processing efficiency of the liquid-cooled radiator.

[0102] Please refer to Figures 7-17 In the third embodiment of the liquid-cooled radiator provided by the present application, the difference between the liquid-cooled radiator and the first and second embodiments is that:

[0103] The extended heat dissipation water channel 42 comprises:

[0104] The first extended water channel 421 is arranged inside the radiator body 1 and is arranged in parallel and spaced apart between the first and second heat dissipation water channels 2 and 3, one end of the first extended water channel 421 penetrates the water inlet and outlet end 11 of the radiator body 1 in the first direction X, and the other end of the first extended water channel 421 penetrates the blocked end 12 of the radiator body 1 in the first direction X.

[0105] The first bottom channel 422 is arranged inside the radiator body 1 and extends along the second direction Y. One end of the first bottom channel 422 is communicated with the end of the first radiating channel 2 away from the water inlet / outlet end 11 (i.e. close to the blocking end 12 in the first direction X) along the second direction Y. The opposite end of the first bottom channel 422 is communicated with the end of the first extension channel 421 away from the water inlet / outlet end 11 (i.e. close to the blocking end 12 in the first direction X) along the second direction Y. The side end of the first bottom channel 422 away from the water inlet / outlet end 11 (i.e. close to the blocking end 12 in the first direction X) is communicated with the bottom of the second open slot 121.

[0106] The second extension channel 423 is arranged inside the radiator body 1 and is arranged in parallel and spaced apart between the first extension channel 421 and the second radiating channel 3. One end of the second extension channel 423 penetrates the water inlet / outlet end 11 of the radiator body 1 along the first direction X. The opposite end of the second extension channel 423 penetrates the blocking end 12 of the radiator body 1 along the first direction X.

[0107] The second bottom channel 424 is arranged inside the radiator body 1 and extends along the second direction Y. One end of the second bottom channel 424 is communicated with the end of the first extension channel 421 away from the blocking end 12 (i.e. close to the water inlet / outlet end 11 in the first direction X) along the second direction Y. The opposite end of the second bottom channel 424 is communicated with the end of the second radiating channel 3 away from the blocking end 12 (i.e. close to the water inlet / outlet end 11 in the first direction X) along the second direction Y. The side end of the second bottom channel 424 away from the water inlet / outlet end 11 (i.e. close to the blocking end 12 in the first direction X) is communicated with the bottom of the first open slot 111.

[0108] The third bottom channel 425 is arranged inside the radiator body 1 and extends along the second direction Y. One end of the third bottom channel 425 is communicated with the end of the second extension channel 423 away from the water inlet / outlet end 11 (i.e. close to the blocking end 12 in the first direction X) along the second direction Y. The opposite end of the third bottom channel 425 is communicated with the end of the second radiating channel 3 away from the water inlet / outlet end 11 (i.e. close to the blocking end 12 in the first direction X) along the second direction Y. The side end of the third bottom channel 425 away from the water inlet / outlet end 11 (i.e. close to the blocking end 12 in the first direction X) is communicated with the bottom of the second open slot 121.

[0109] The first heat dissipation water channel 2, the first groove bottom water channel 422, the first extension water channel 421, the second groove bottom water channel 424, the second extension water channel 423, the third groove bottom water channel 425 and the second heat dissipation water channel 3 are sequentially connected to form a refrigerant heat dissipation flow channel in an S-shaped continuous bending manner, so that the length of the refrigerant heat dissipation flow channel flowing through the inside of the heat dissipation main body 1 is further extended, thereby improving the heat dissipation effect.

[0110] In other embodiments of the present embodiment, one or more extension water channels and groove bottom water channels can be additionally arranged between the third groove bottom water channel 425 and the second heat dissipation water channel 3 according to the size of the heat dissipation main body 1 and the actual heat dissipation requirement, so as to further extend the length of the refrigerant heat dissipation flow channel flowing through the inside of the heat dissipation main body 1, thereby further improving the heat dissipation effect.

[0111] Please refer to Figures 1-17 In the third embodiment of the liquid cooling heat dissipation device, the processing and sealing manner of the heat dissipation main body 1 and the first heat dissipation water channel 2, the extension heat dissipation water channel 42 (intermediate heat dissipation water channel 4) and the second heat dissipation water channel 3 inside the heat dissipation main body 1 are similar to those of the liquid cooling heat dissipation device in the second embodiment, which will not be described here.

[0112] Please refer to Figures 1-17 As a preferred embodiment common to the first to third embodiments, the first heat dissipation water channel 2, the first extension water channel 421, the second extension water channel 423 and the second heat dissipation water channel 3 are arranged in parallel and spaced apart, and the first groove bottom water channel 422, the second groove bottom water channel 424 and the third groove bottom water channel 425 are all arranged perpendicular to the first heat dissipation water channel 2.

[0113] Please refer to Figures 1-17 As a preferred embodiment common to the first to third embodiments, the inner wall of the first heat dissipation water channel 2, the second heat dissipation water channel 3 and the intermediate heat dissipation water channel 4 is provided with a protruding structure 10 to increase the heat exchange area of the refrigerant heat dissipation flow channel and the flowing refrigerant.

[0114] Please refer to Figures 1-17 As a more preferred embodiment common to the first to third embodiments, the inner wall of the first heat dissipation water channel 2, the second heat dissipation water channel 3 and the intermediate heat dissipation water channel 4 is provided with a protruding structure 10 in the form of a convex tooth.

[0115] Please refer to Figure 18 As a preferred embodiment common to the first to third embodiments, the heat dissipation main body 1 is made of aluminum profile, the first heat dissipation water channel 2, the second heat dissipation water channel 3 and the intermediate heat dissipation water channel 4 are formed by extrusion or machining, and the sealing structure 5 is welded and sealed at the through sealing end 12 of the first heat dissipation water channel 2 and the second heat dissipation water channel 3.

[0116] As a more preferred embodiment common to the first to third embodiments, the heat dissipation main body 1 is made of AL6063 aluminum profile with better heat conduction performance to ensure the heat dissipation efficiency of the liquid cooling heat dissipation device.

[0117] Referring to Figure 18 The utility model further provides a power supply power device, including above-mentioned liquid cooling radiator, still include at least one power module, install in the outer surface of radiator main body 1.

[0118] Referring to Figure 18 In the embodiment, the outer surface of one end of the radiator main body 1 in the third direction Z is provided with a glue pouring groove 13, and the outer surface of the radiator main body 1 is provided with a plurality of first threaded holes 14 corresponding to the edge of the glue pouring groove 13.

[0119] The power module comprises:

[0120] The first power module 8 comprises: a first heat-conducting insulation sheet 81 covering the outer surface of the radiator main body 1 corresponding to the edge of the glue pouring groove 13, the first heat-conducting insulation sheet 81 being provided with a clearance through hole matched with the glue pouring groove 13 and a screw through hole 811 matched with the first threaded hole 14; a first circuit board 82 installed on the outer layer of the first heat-conducting insulation sheet 81 in the third direction Z and away from the radiator main body 1 and covering the glue pouring groove 13, the first circuit board 82 being provided with a first screw via hole 821 matched with the screw through hole 811, and the glue pouring groove 13, the clearance through hole and the first circuit board 82 being filled with heat-conducting glue; a transformer 83 and a plurality of first MOS units 84 electrically connected to one side of the first circuit board 82 in the third direction Z away from the radiator main body 1.

[0121] The first circuit board 82 and the first heat-conducting insulation sheet 81 are fastened and installed on the radiator main body 1 through the first connecting screw 85 along the third direction Z passing through the corresponding first screw via hole 821, screw through hole 811 and first threaded hole 14.

[0122] Referring to Figure 18 In the embodiment, the outer surface of the radiator main body 1 is further provided with a plurality of second threaded holes 15 spaced apart from the glue pouring groove 13 in the first direction X.

[0123] The power module further comprises:

[0124] The second power module 9 comprises: a plurality of second heat-conductive insulation sheets 91 installed on the outer surface of the radiator main body 1; a plurality of second MOS units 92 installed one by one on the outer layer of each second heat-conductive insulation sheet 91 in the third direction Z away from the radiator main body 1; a second circuit board 93 installed on the outer layer of each second MOS unit 92 in the third direction Z away from the radiator main body 1, the second circuit board 93 being provided with a second screw through hole 931 matched with the second threaded hole 15; a plurality of insulation pads 94 installed on one side of the second circuit board 93 in the third direction Z away from the radiator main body 1, the insulation pad 94 being provided with a screw through hole 941 matched with the second screw through hole 931; and a plurality of pressing strips 95 installed one by one on the outer layer of each insulation pad 94 in the third direction Z away from the radiator main body 1, the pressing strip 95 being provided with a screw mounting hole 951 matched with the screw through hole 941.

[0125] The pressing strip 95, the insulation pad 94, the second circuit board 93, the second MOS unit 92 and the second heat-conductive insulation sheet 91 are fastened and installed on the radiator main body 1 through the second connecting screw 96 along the third direction Z through the corresponding screw mounting hole 951, the screw through hole 941, the second screw through hole 931 and the second threaded hole 15.

[0126] Please refer to Figure 18 , as a preferred embodiment of the present embodiment, the outer surface of one end of the radiator main body 1 in the third direction Z is provided with a pair of glue filling grooves 13 spaced apart in the first horizontal direction, the first heat-conductive insulation sheet 81 is provided with a pair of let-through holes matched with the pair of glue filling grooves 13, respectively, and a plurality of first MOS units 84 are arranged on one side of the first circuit board 82 in the third direction Z away from the radiator main body 1, and a pair of transformers 83 are arranged on one side of the first circuit board 82 in the third direction Z away from the radiator main body 1 and matched with the pair of let-through holes and the pair of glue filling grooves 13 in the first horizontal direction.

[0127] As a preferred embodiment of the present embodiment, the first heat-conductive insulation sheet 81 is a heat-conductive insulation cloth sheet.

[0128] As a preferred embodiment of the present embodiment, the second heat-conductive insulation sheet 91 is a heat-conductive insulation ceramic sheet.

[0129] Please refer to ​ , as a preferred embodiment of the present embodiment, a pair of third pressing strips 95 and insulation pads 94 are arranged on one side of the second circuit board 93 in the direction away from the radiator main body 1, respectively, and four second MOS units 92 and second heat-conductive insulation sheets 91 are arranged between one side of the second circuit board 93 in the direction toward the radiator main body 1 and the radiator main body 1, respectively.

[0130] The above merely describes the preferred embodiments of the present application, and is not intended to limit the present application, and any modification, equivalent replacement, and improvement within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A liquid-cooled heat sink, characterized in that, include: Radiator body (1); The first heat dissipation channel (2) is located inside the radiator body (1). One end of the first heat dissipation channel (2) passes through the inlet and outlet end (11) of the radiator body (1) and forms a water channel inlet (21) at the inlet and outlet end (11). The other end of the first heat dissipation channel (2) passes through the blocking end (12) of the radiator body (1) relative to the inlet and outlet end (11). The second heat dissipation channel (3) is located inside the radiator body (1). One end of the second heat dissipation channel (3) passes through the inlet and outlet end (11) and forms a water outlet (31) at the inlet and outlet end (11). The other end of the second heat dissipation channel (3) passes through the sealing end (12). The intermediate heat dissipation channel (4) is located inside the radiator body (1) and is connected between the first heat dissipation channel (2) and the second heat dissipation channel (3); The sealing structure (5) is used to seal the first heat dissipation channel (2) and the second heat dissipation channel (3) at the sealing end (12). The inlet connector (6) and outlet connector (7) are respectively installed at the waterway inlet (21) and waterway outlet (31).

2. The liquid-cooled heat sink as described in claim 1, characterized in that, The cross-sections of the first heat dissipation channel (2) and the second heat dissipation channel (3), the channel inlet (21) and the channel outlet (31) are all circular. The other end of the first heat dissipation channel (2) passes through the sealing end (12) to form a first channel opening (22), and the other end of the second heat dissipation channel (3) passes through the sealing end (12) to form a second channel opening (32). The intermediate heat dissipation channel (4) is a connecting heat dissipation channel (41). One end of the connecting heat dissipation channel (41) is connected between the first heat dissipation channel (2) and the second heat dissipation channel (3). The other end of the connecting heat dissipation channel (41) passes through the side end of the radiator body (1) located between the inlet / outlet end (11) and the sealing end (12). The other end of the connecting heat dissipation channel (41) forms a third water channel opening (411) at the corresponding side end of the radiator body (1). The sealing structure (5) includes: The first waterproof plug (51), the second waterproof plug (52), and the third waterproof plug (53) are respectively sealed in the first waterway opening (22), the second waterway opening (32), and the third waterway opening (411).

3. The liquid-cooled heat sink as described in claim 1, characterized in that, The cross-sections of the first heat dissipation channel (2) and the second heat dissipation channel (3), the channel inlet (21) and the channel outlet (31) are all rectangular or elongated. The inlet and outlet end (11) is provided with a first opening groove (111) covering the first heat dissipation channel (2) and the second channel. The channel inlet (21) and the channel outlet (31) are formed at the bottom of the first opening groove (111). The sealing end (12) is provided with a second opening groove (121) covering the first heat dissipation channel (2) and the second channel. The intermediate heat dissipation channel (4) is an extended heat dissipation channel (42) that connects the ends of the first heat dissipation channel (2) and the second heat dissipation channel (3) away from the inlet and outlet end (11) and connects to the bottom of the second opening groove (121). The sealing structure (5) includes: The first waterway insert (54) is shaped to match the first opening groove (111) and is embedded in the first opening groove (111). It is provided with an inlet through hole (541) and an outlet through hole (542) that match the waterway inlet (21) and the waterway outlet (31) respectively. The inlet connector (6) and the outlet connector (7) are respectively installed in the inlet through hole (541) and the outlet through hole (542). The second waterway insert (55) is shaped to match the second opening groove (121) and is inserted into and sealed in the second opening groove (121).

4. The liquid-cooled heat sink as described in claim 3, characterized in that, The extended cooling channel (42) includes: The first extension water channel (421) is located between the first heat dissipation water channel (2) and the second heat dissipation water channel (3). One end of the first extension water channel (421) passes through the inlet and outlet water end (11), and the other end of the first extension water channel (421) passes through the sealing end (12). The first bottom channel (422) is connected at one end to the end of the first heat dissipation channel (2) away from the inlet / outlet end (11), and at the other end to the end of the first extension channel (421) away from the inlet / outlet end (11). The first bottom channel (422) is also connected to the bottom of the second open channel (121). The second extension water channel (423) is located between the first extension water channel (421) and the second heat dissipation water channel (3). One end of the second extension water channel (423) passes through the inlet and outlet end (11), and the other end of the second extension water channel (423) passes through the sealing end (12). The second bottom channel (424) is connected at one end to the end of the first extension channel (421) away from the sealing end (12), and at the other end to the end of the second heat dissipation channel (3) away from the sealing end (12). The second bottom channel (424) is also connected to the bottom of the first open channel (111). The third bottom channel (425) is connected at one end to the end of the second extended channel (423) away from the inlet / outlet end (11), and at the other end to the end of the second heat dissipation channel (3) away from the inlet / outlet end (11). The third bottom channel (425) is also connected to the bottom of the second open channel (121).

5. The liquid-cooled heat sink as described in claim 4, characterized in that, The first heat dissipation channel (2), the first extended channel (421), the second extended channel (423) and the second heat dissipation channel (3) are arranged in parallel and spaced apart. The first bottom channel (422), the second bottom channel (424) and the third bottom channel (425) are all arranged perpendicular to the first heat dissipation channel (2).

6. The liquid-cooled heat sink according to any one of claims 1-5, characterized in that, The inner walls of the first heat dissipation channel (2), the second heat dissipation channel (3) and the intermediate heat dissipation channel (4) are provided with protruding structures (10).

7. The liquid-cooled heat sink according to any one of claims 1-5, characterized in that, The radiator body (1) is made of aluminum profile. The first heat dissipation channel (2), the second heat dissipation channel (3) and the intermediate heat dissipation channel (4) are formed by extrusion or machining. The sealing structure (5) is welded and sealed at the end (12) through which the first heat dissipation channel (2) and the second heat dissipation channel (3) pass.

8. A power supply device, characterized in that, The liquid-cooled radiator as described in any one of claims 1-7 further includes at least one power module mounted on the outer surface of the radiator body (1).

9. The power supply device as described in claim 8, characterized in that, The outer surface of the radiator body (1) is provided with a glue-filling groove (13), and the outer surface of the radiator body (1) is provided with a plurality of first threaded holes (14) corresponding to the edge of the glue-filling groove (13); The power module includes: The first power module (8) includes: a first thermally conductive insulating sheet (81) covering the outer surface of the heat sink body (1) at the edge of the potting groove (13), the first thermally conductive insulating sheet (81) having a clearance through hole matching the potting groove (13) and a screw through hole (811) matching the first threaded hole (14); a first circuit board (82) mounted on the outer layer of the first thermally conductive insulating sheet (81) facing away from the heat sink body (1) and covering the potting groove (13), the first circuit board (82) having a first screw through hole (821) matching the screw through hole (811), and thermally conductive glue being potted between the potting groove (13), the clearance through hole and the first circuit board (82); a transformer (83) and a plurality of first MOS units (84) electrically connected to the side of the first circuit board (82) facing away from the heat sink body (1); The first circuit board (82) and the first thermally conductive insulating sheet (81) are fastened to the heat sink body (1) by the first connecting screw (85) passing through the corresponding first screw through hole (821), screw through hole (811) and first threaded hole (14).

10. The power supply device as described in claim 9, characterized in that, The outer surface of the radiator body (1) is also provided with a number of second threaded holes (15) spaced apart from the glue potting groove (13); The power module also includes: The second power module (9) includes: a plurality of second thermally conductive insulating sheets (91) mounted on the outer surface of the heat sink body (1); a plurality of second MOS units (92) mounted one-to-one on the outer layer of each second thermally conductive insulating sheet (91) facing away from the heat sink body (1); a second circuit board (93) covering the outer layer of each second MOS unit (92) facing away from the heat sink body (1), the second circuit board (93) having a second screw through hole (931) matching the second threaded hole (15); a plurality of insulating pads (94) mounted on the side of the second circuit board (93) facing away from the heat sink body (1), the insulating pads (94) having screw through holes (941) matching the second screw through holes (931); and a plurality of pressure strips (95) mounted one-to-one on the outer layer of each insulating pad (94) facing away from the heat sink body (1), the pressure strips (95) having screw mounting holes (951) matching the screw through holes (941). The pressure strip (95), insulating pad (94), second circuit board (93), second MOS unit (92) and second thermally conductive insulating sheet (91) are fastened to the heat sink body (1) by the second connecting screw (96) passing through the corresponding screw mounting hole (951), screw through hole (941), second screw through hole (931) and second threaded hole (15).

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