Liquid cooling heat sink and power assembly

Abstract

The application discloses a liquid cooling heat dissipation device and a power assembly. The liquid cooling heat dissipation device comprises a main body provided with a liquid inlet, a liquid outlet and a flow channel communicating the liquid inlet and the liquid outlet. The main body comprises at least one set of heat dissipation cover plates. Each set of the heat dissipation cover plates comprises an upper cover plate and a lower cover plate oppositely arranged along a Z-axis direction. At least one of the opposite surfaces of the upper cover plate and the lower cover plate is provided with a plurality of fins protruding along the Z-axis direction. The flow channel is formed at least partially between the upper cover plate and the lower cover plate. The liquid cooling heat dissipation device can improve the contradiction between the structural strength and the heat dissipation efficiency of the liquid cooling plate.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of liquid cooling heat dissipation, in particular to a liquid cooling heat dissipation device and a power assembly. BACKGROUND

[0002] The power assembly is an indispensable part of the converter, which includes multiple groups of power tubes. The power tubes generate a large amount of heat during work. If the heat is not dissipated in time and effectively, the power assembly will be damaged due to overheating. To solve the problem of heat dissipation of the power assembly, the prior art proposes to dissipate heat for the power assembly by liquid cooling. Specifically, the power tubes can be fixedly installed on the surface of the liquid cooling plate, and the cooling liquid circulating in the liquid cooling plate is used to take away the heat of the power tubes. Since the power tubes on the liquid cooling plate are generally arranged on both sides, the existing liquid cooling plate generally adopts a sandwich structure, that is, it mainly includes an upper cover plate, a lower cover plate and a flow channel plate. The upper and lower surfaces of the flow channel plate are machined to form a large number of flow channel grooves, and the upper and lower cover plates cover the upper and lower surfaces of the flow channel plate to form flow channels in cooperation with the flow channel grooves. However, the liquid cooling plate with this structure has the following defects: in order to improve the heat dissipation efficiency of the power tubes, the upper and lower cover plates should be as thin as possible, but the mechanical strength of the upper and lower cover plates that are too thin cannot meet the requirements of fixedly installing the power tubes. SUMMARY

[0003] The present application aims to overcome the above-mentioned defects or problems in the background art, and to provide a liquid cooling heat dissipation device and a power assembly, which can improve the contradiction between the structural strength and the heat dissipation efficiency of the liquid cooling plate.

[0004] To achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0005] Technical solution one: a liquid cooling heat dissipation device, comprising: a main body provided with an inlet, an outlet and a flow channel connecting the inlet and the outlet; the main body comprises at least one group of heat dissipation cover plates, each group of heat dissipation cover plates comprises an upper cover plate and a lower cover plate arranged oppositely along the Z-axis direction, at least one of the opposite surfaces of the upper cover plate and the lower cover plate is provided with a plurality of fins protruding along the Z-axis direction, and the upper cover plate and the lower cover plate cooperate to form at least part of the flow channel.

[0006] Technical solution two based on technical solution one: in each group of heat dissipation cover plates, the upper cover plate and the lower cover plate are both provided with a plurality of fins, and each fin extends along the X-axis direction and is arranged along the Y-axis direction; the width of each fin in the Y-axis direction gradually decreases from the bottom to the top.

[0007] Technical solution three based on technical solution two: each fin is provided with a tooth-like structure on both sides in the Y-axis direction for increasing the surface area of the fin.

[0008] Based on the technical solution three, the fourth technical solution is that each group of the heat dissipation cover plate further comprises a partition plate between the upper cover plate and the lower cover plate of the group of heat dissipation cover plates, the size of the partition plate in the X-axis direction and the Y-axis direction is matched with the upper cover plate and the lower cover plate, so that the flow channel in the heat dissipation cover plate is divided into two parts in the Z-axis direction.

[0009] Based on the fourth technical solution, the fifth technical solution is that at the liquid inlet end of each group of the heat dissipation cover plate, the thickness of the partition plate is configured to form a gap between the two sides of the partition plate in the Z-axis direction and the top of the fins on the upper cover plate and the lower cover plate, which gradually decreases along the liquid passing direction; along the liquid passing direction, after the gap, the thickness of the partition plate is configured to be in contact with the top of the fins on the upper cover plate and the lower cover plate on the two sides of the partition plate in the Z-axis direction.

[0010] Based on the fifth technical solution, the sixth technical solution is that in at least one group of the heat dissipation cover plate, each fin on the upper cover plate and the lower cover plate is provided with a notch penetrating in the Y-axis direction at a preset length interval in the X-axis direction.

[0011] Based on the sixth technical solution, the seventh technical solution is that the main body comprises a first frame, a second frame, a third frame and a fourth frame which are sequentially fixed; the first frame and the second frame are used for fixing and sealing the edges of the heat dissipation cover plate in the X-axis direction, and the third frame and the fourth frame are used for fixing and sealing the edges of the heat dissipation cover plate in the Y-axis direction.

[0012] Based on the fifth to seventh technical solutions, the eighth technical solution is that the main body further comprises a fifth frame; the main body comprises two groups of heat dissipation cover plates which are arranged along the Y-axis direction, and the fifth frame is located between the two groups of heat dissipation cover plates and is used for fixing and sealing the edges of the two groups of heat dissipation cover plates in the Y-axis direction; the first frame is provided with the liquid inlet and the liquid outlet, and is provided with a first flow passage corresponding to the liquid inlet and a second flow passage corresponding to the liquid outlet; the second frame is provided with a third flow passage; in the two groups of heat dissipation cover plates, the flow channel in one group of heat dissipation cover plates is connected with the first flow passage and the third flow passage, and the liquid passing direction thereof is directed from the first frame to the second frame, and the flow channel in the other group of heat dissipation cover plates is connected with the third flow passage and the second flow passage, and the liquid passing direction thereof is directed from the second frame to the first frame.

[0013] Based on the eighth technical solution, the ninth technical solution is that the main body is provided with a flow discharge port near the liquid outlet, the flow discharge port is connected with the flow channel, and the position thereof is configured to be suitable for emptying the flow channel.

[0014] In addition, the present application also provides a tenth technical solution: a power assembly comprising a plurality of power tubes, the power tubes are installed against the heat dissipation cover plate of the liquid cooling heat dissipation device according to any one of the first to ninth technical solutions.

[0015] From the above description of the present application, relative to the prior art, the present application has the following beneficial effects:

[0016] The technical scheme one provides a liquid cooling heat dissipation device, which comprises a main body, an inlet, an outlet and a flow channel connecting the inlet and the outlet are arranged on the main body; during operation, the cooling liquid with low temperature is poured into the main body through the inlet, and the cooling liquid is transported through the flow channel and then reaches the outlet; in this process, the cooling liquid absorbs the heat emitted by the heat dissipation component on the main body, and the cooling liquid with high temperature is sent out of the main body through the outlet.

[0017] The main body comprises at least one set of heat dissipation cover plates, the heat dissipation cover plates comprise an upper cover plate and a lower cover plate, the upper cover plate and the lower cover plate are arranged opposite to each other in the Z-axis direction, and at least one of the opposite surfaces of the upper cover plate and the lower cover plate is provided with fins; the space between the upper cover plate and the lower cover plate forms the flow channel; compared with the sandwich structure liquid cooling plate in the background art, the fins are directly formed on the upper cover plate and / or the lower cover plate in the liquid cooling heat dissipation device provided by the technical scheme, and the flow channel plate is not needed to be arranged, and the structural strength of the upper cover plate and / or the lower cover plate is enhanced through the fins; the fins themselves increase the contact area of the heat dissipation cover plate and the cooling liquid, which is beneficial to improve the heat dissipation efficiency.

[0018] In the conventional sandwich structure liquid cooling plate, a plurality of fins are arranged on the two sides of the flow channel plate, and the upper cover plate and the lower cover plate are attached to the top ends of the fins; for example, the heat dissipation component is arranged on the upper cover plate, the upper cover plate, the fins and the side surface of the flow channel plate cooperate to form a plurality of flow channels; the heat dissipation path of the liquid cooling plate of this structure comprises: the heat dissipation component transmits heat to the upper cover plate, the upper cover plate transmits heat to the cooling liquid in contact with the upper cover plate, and a part of the heat is directly taken away by the cooling liquid, and the other part of the heat is transmitted to the flow channel plate, the flow channel plate is heated, and the heat is transmitted to the cooling liquid through the part of the flow channel plate in contact with the cooling liquid, and then the heat is taken away by the cooling liquid; compared with the above, the heat dissipation path is adjusted, and the heat dissipation efficiency is higher; specifically, for example, the heat dissipation component is arranged on the upper cover plate, the heat dissipation component transmits heat to the upper cover plate, and the upper cover plate directly transmits heat to the cooling liquid in contact with the upper cover plate; it should be noted that at this time, the part of the cooling liquid in contact with the upper cover plate includes the area increased by the fins arranged on the upper cover plate in addition to the side surface of the upper cover plate; in this process, since the fins are directly arranged on the upper cover plate, the flow channel plate is no longer needed to indirectly conduct heat, thereby effectively improving the heat dissipation efficiency; at the same time, the large amount of surface of the fins can also directly improve the heat dissipation efficiency of the upper cover plate or the lower cover plate.

[0019] In addition, when only one of the upper cover plate or the lower cover plate is provided with fins, the component to be cooled is arranged on the cover plate provided with fins, so as to ensure the structural strength of the corresponding cover plate; when fins are arranged on both the upper cover plate and the lower cover plate, both the upper cover plate and the lower cover plate have good heat dissipation effect and structural strength, and the component to be cooled can be arranged on both the upper cover plate and the lower cover plate, so as to reduce the volume of the corresponding power assembly.

[0020] In the second technical scheme, the upper cover plate and the lower cover plate are both provided with fins, both of which have good heat dissipation effect and high structural strength, and the fins extend along the X-axis direction, the side surface formed by the extension of the fins can increase the surface area of the upper cover plate and the lower cover plate in contact with the cooling liquid, and improve the heat dissipation effect; meanwhile, a plurality of fins are arranged along the Y-axis direction, which can further increase the contact area with the cooling liquid; in addition, the width of the fins in the Y-axis direction gradually decreases from the bottom to the top, forming a shape of wide bottom and narrow top, when the heat is transferred from the outer surface of the upper cover plate and the lower cover plate to the inner surface, the fins have a larger contact part, and the space between the fins is larger, which can improve the flow rate of the flow channel, and the two cooperate with each other, so that the heat dissipation efficiency of the heat dissipation cover plate is effectively improved; in addition, the fins are arranged on both the upper cover plate and the lower cover plate, so that the thickness of the entire heat dissipation cover plate can be kept within a proper range, and the screws can be easily locked.

[0021] In the third technical scheme, the teeth structure is arranged on both sides of the fin, which increases the contact area of the fin with the cooling liquid and improves the heat dissipation efficiency.

[0022] In the fourth technical scheme, the partition plate is arranged between the upper cover plate and the lower cover plate, the partition plate can divide the flow channel in the heat dissipation cover plate into two independent parts, by reducing the flow area of the flow channel, the cooling liquid in the flow channel can flow faster under the same flow condition, so as to take away the heat faster; meanwhile, when the upper cover plate and the lower cover plate are both provided with components to be cooled, the two parts of the flow channel can independently cool the two groups of components to be cooled, avoiding mutual influence, and at the same time, the partition plate can assist the side with higher temperature to cool the side with lower temperature.

[0023] In the fifth technical scheme, at the liquid inlet end of the heat dissipation cover plate, a gradually decreasing gap is formed between the partition plate and the upper and lower cover plates, through the gap, when the cooling liquid just enters the flow channel, the boundary layer does not appear on the surface close to the partition plate, the boundary layer will cause the flow rate of the cooling liquid in the flow channel to be different at different positions in the Z-axis direction, resulting in a decrease in the heat conduction effect of the cooling liquid; then the cooling liquid is guided to the part where the partition plate and the top of the fin meet, because the cooling liquid has passed through the gap before, the boundary layer phenomenon of the cooling liquid is weakened to the minimum, and the cooling liquid can have high heat dissipation efficiency; in addition, the tooth structure arranged on the fin can also effectively destroy the boundary layer of the cooling liquid close to the surface of the fin.

[0024] In the sixth technical solution, a notch is arranged on each fin on the upper cover plate and the lower cover plate every preset length along the X-axis direction. The originally independent flow of the cooling liquid between the fins will be mixed at the position of the notch, thereby reducing the influence of the cooling liquid boundary layer.

[0025] In the seventh technical solution, the main body includes a plurality of frames. The frames and the heat dissipation cover plate can be fixed as a whole through tailor welding or other processes, thereby reducing the machining process of the main body and reducing the manufacturing cost. Meanwhile, the upper cover plate, the lower cover plate and the partition plate in the heat dissipation cover plate are connected with the frames. The heat of the to-be-cooled component can be transmitted to the frames through the heat dissipation cover plate. The low air temperature at the frames can achieve heat dissipation of the frames, thereby improving the heat dissipation efficiency of the to-be-cooled component.

[0026] In the eighth technical solution, the fifth frame can close the edges of the two groups of heat dissipation cover plates. The liquid inlet and the liquid outlet are arranged on the first frame, and the cooling liquid is reversed through the second frame. The overall flow channel is easy to process and manufacture, and the manufacturing cost can be effectively reduced.

[0027] In the ninth technical solution, the flow outlet is arranged on the main body, so that the cooling liquid in the flow channel can be quickly emptied, and the liquid cooling heat dissipation device is convenient to maintain and repair.

[0028] In the tenth technical solution, a power assembly is provided. The power assembly includes the liquid cooling heat dissipation device and a plurality of power tubes. The liquid cooling heat dissipation device can conveniently dissipate heat of the power tubes. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0030] Figure 1 Structure diagram of the liquid cooling heat dissipation device provided for the first embodiment of the present application Figure 1

[0031] Figure 2 Structure diagram of the liquid cooling heat dissipation device provided for the first embodiment of the present application Figure 2

[0032] Figure 3 Structure diagram of the liquid cooling heat dissipation device provided for the first embodiment of the present application Figure 3

[0033] Figure 4 Structure diagram of the liquid cooling heat dissipation device provided for the first embodiment of the present application​​​Figure 4 ;

[0034] Figure 5 A partial structural diagram of the liquid cooling heat dissipation device provided in Embodiment 1 of the present invention. Figure 1 ;

[0035] Figure 6 A partial structural diagram of the liquid cooling heat dissipation device provided in Embodiment 1 of the present invention. Figure 2 ;

[0036] Figure 7 A partial structural diagram of the liquid cooling heat dissipation device provided in Embodiment 1 of the present invention. Figure 3 ;

[0037] Figure 8 for Figure 7 An enlarged schematic diagram of part A in the middle;

[0038] Figure 9 This is a schematic diagram of the liquid cooling heat dissipation device provided in Embodiment 2 of the present invention. Figure 1 ;

[0039] Figure 10 This is a schematic diagram of the liquid cooling heat dissipation device provided in Embodiment 2 of the present invention. Figure 2 ;

[0040] Figure 11 This is a schematic diagram of the liquid cooling heat dissipation device provided in Embodiment 2 of the present invention. Figure 3 ;

[0041] Figure 12 for Figure 11 Schematic diagram of section AA;

[0042] Figure 13 for Figure 11 Schematic diagram of the BB section;

[0043] Figure 14 for Figure 9 Enlarged schematic diagram of part B;

[0044] Figure 15 This is a partial structural schematic diagram of the liquid cooling heat dissipation device provided in Embodiment 2 of the present invention;

[0045] Figure 16 This is a schematic diagram of the power component provided in Embodiment 3 of the present invention.

[0046] Explanation of key figure labels:

[0047] Body 1; liquid inlet 2; liquid outlet 3; flow channel 4; heat dissipation cover plate 5; upper cover plate 6; lower cover plate 7; fin 8; toothed structure 9; gap 10; notch 11; first frame 12; second frame 13; third frame 14; fourth frame 15; fifth frame 16; first flow passage 17; second flow passage 18; third flow passage 19; flow discharge port 20; power tube 21; liquid inlet pipe 22; liquid outlet pipe 23; flow discharge valve 24; partition 25; plug-in flange 26; plug-in slot 27; plug-in tenon 28; plug-in port 29; liquid inlet portion 30; guide portion 31; abutment portion 32; cover plate flow passage 33; inter-fin passage 34. DETAILED DESCRIPTION

[0048] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are preferred embodiments of the present application, and should not be regarded as exclusion of other embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0049] In the claims, the specification, and the above drawings of the present application, unless otherwise expressly limited, the use of terms such as "first" and "second" or "third" are used to identify features of different objects and are not to be construed as describing a particular sequential order, unless otherwise expressly limited.

[0050] In the claims, the specification, and the above drawings of the present application, unless otherwise expressly limited, the use of terms such as "center", "transverse", "longitudinal", "horizontal", "vertical", "top", "bottom", "inner", "outer", "upper", "lower", "front", "back", "left", "right", "clockwise", "counterclockwise" indicate the orientation or positional relationship based on the orientation and position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and are not intended to indicate or imply that the devices or elements referred to must have a particular orientation or be constructed and operated in a particular orientation, so it cannot be understood as limiting the specific protection scope of the present application.

[0051] In the claims, the specification, and the above drawings of the present application, unless otherwise expressly limited, the use of terms such as "fixedly connected" or "fixedly connected" should be broadly understood, that is, any connection mode between the two without displacement relationship and relative rotation relationship, that is, it includes non-detachable fixed connection, detachable fixed connection, integration and fixed connection through other devices or elements.

[0052] In the claims, the specification, and the above drawings of the present application, the use of terms such as "include", "have" and their variants is intended to mean "include but not limited to".

[0053] Example 1:

[0054] The embodiment 1 of the present application provides a liquid cooling heat dissipation device which can be applied to a power assembly to dissipate heat for a power tube 21 in the power assembly.

[0055] With reference to Figure 1 and Figure 2 , the liquid cooling heat dissipation device comprises a main body 1, an inlet pipe 22, an outlet pipe 23 and a drain valve 24.

[0056] With reference to Figure 1 , the main body 1 of the liquid cooling heat dissipation device is provided with an inlet 2, an outlet 3 and a flow channel 4 connecting the inlet 2 and the outlet 3 (the flow channel 4 is not shown in the figure). Figure 1 With reference to Figure 2 , the inlet 2 is communicated with the inlet pipe 22, and the inlet pipe 22 can be installed on the main body 1 by means of quick joint connection or fixed on the main body 1 by welding, and the welding can avoid water leakage at the connection part of the inlet pipe 22 and the main body 1. The outlet 3 is communicated with the outlet pipe 23, and the connection mode is the same as that of the inlet pipe 22, which will not be described in detail.

[0057] With reference to Figure 1 , the main body 1 is provided with a drain port 20 near the outlet 3, and the drain port 20 is communicated with the flow channel 4 and is configured to be suitable for emptying the flow channel 4. Figure 2 The drain valve 24 is arranged at the drain port 20, and by opening and closing the drain valve 24, the cooling liquid in the flow channel 4 can be completely discharged outside the main body 1 when needed. The position of the drain port 20 should be at the end position of the flow channel 4 inside the main body 1, and the position should be able to completely discharge the cooling liquid, and the cooling liquid will not accumulate in the flow channel 4. The position of the drain port 20 can be designed by the actual needs of those skilled in the art.

[0058] With reference to Figure 1 , the main body 1 comprises at least one set of heat dissipation cover plates 5, each set of heat dissipation cover plates 5 comprises an upper cover plate 6 and a lower cover plate 7 arranged opposite along the Z-axis direction, at least one of the opposite surfaces of the two is provided with a plurality of fins 8 protruding along the Z-axis direction, and the two are cooperated to form at least part of the flow channel 4. Figure 1 With reference to , the main body 1 comprises a first frame 12, a second frame 13, a third frame 14 and a fourth frame 15 which are sequentially fixed in head and tail, and further comprises a fifth frame 16. The first frame 12 and the second frame 13 are used to fix and block the edges of the heat dissipation cover plates 5 in the X-axis direction, and the third frame 14 and the fourth frame 15 are used to fix and block the edges of the heat dissipation cover plates 5 in the Y-axis direction. In this embodiment, the heat dissipation cover plates 5 are provided with two sets which are arranged along the Y-axis direction, and the fifth frame 16 is located between the two sets of heat dissipation cover plates 5 and is used to fix and block the edges of the two sets of heat dissipation cover plates 5 in the Y-axis direction.

[0059] Specifically, referring to Figure 3 In the specification and claims, the Z-axis direction refers to the up-down direction, wherein the position where the upper cover plate 6 is located is the upper side, and the position where the lower cover plate 7 is located is the lower side; the Y-axis direction refers to the front-rear direction, and the third side frame 14 and the fourth side frame 15 are respectively located at the rear side and the front side; and the X-axis direction refers to the left-right direction, and the first side frame 12 and the second side frame 13 are respectively located at the left side and the right side.

[0060] Referring to Figure 3 and Figure 4 The first side frame 12 is provided with the liquid inlet 2 and the liquid outlet 3, and is provided with the first flow passage 17 corresponding to the liquid inlet 2 and the second flow passage 18 corresponding to the liquid outlet 3, and the second side frame 13 is provided with the third flow passage 19; in the two groups of heat dissipation cover plates 5, the flow channel 4 in one group of heat dissipation cover plates 5 is communicated with the first flow passage 17 and the third flow passage 19, and the liquid flow direction is from the first side frame 12 to the second side frame 13, and the flow channel 4 in the other group of heat dissipation cover plates 5 is communicated with the third flow passage 19 and the second flow passage 18, and the liquid flow direction is from the second side frame 13 to the first side frame 12.

[0061] Among them, the first side frame 12, the second side frame 13, the third side frame 14, the fourth side frame 15 and the fifth side frame 16 are all long strip components, the first side frame 12 is provided with a plug-in interface 29 at a position corresponding to the third side frame 14, the fourth side frame 15 and the fifth side frame 16, the second side frame 13 is provided with a plug-in interface 29 at a position corresponding to the third side frame 14 and the fourth side frame 15, the left and right ends of the third side frame 14 and the fourth side frame 15 are provided with plug-in tenons 28, and the left end of the fifth side frame 16 is provided with a plug-in tenon 28, the plug-in tenon 28 of each side frame can be plugged and matched with the corresponding plug-in interface 29, when assembling the main body 1, the various side frames can be first plugged and fixed with each other, and then the side frames and the heat dissipation cover plates 5 are connected into one body by welding. Among them, the flow direction of the cooling liquid is: the cooling liquid first enters the first flow passage 17 from the liquid inlet 2, then enters the part of the flow channel 4 in the heat dissipation cover plate 5 located at the rear side from the first flow passage 17, then enters the third flow passage 19 on the second side frame 13, and then enters the part of the flow channel 4 in the heat dissipation cover plate 5 located at the front side from the third flow passage 19, then enters the second flow passage 18 on the first side frame 12, and finally flows out from the liquid outlet 3.

[0062] Referring to Figure 3 In one group of heat dissipation cover plates 5, one upper cover plate 6 and one lower cover plate 7 are provided, and in this embodiment, a plurality of fins 8 are provided on the upper cover plate 6 and the lower cover plate 7, but in other embodiments, fins 8 can be provided on only one of the upper cover plate 6 and the lower cover plate 7, depending on the installation of the power tube 21. Referring to Figure 5The fins 8 on the upper cover plate 6 and the lower cover plate 7 extend downward and upward respectively, that is, extend from the bottom surface of the upper cover plate 6 and the top surface of the lower cover plate 7. At the same time, the fins 8 extend along the X-axis direction and are arranged along the Y-axis direction. Referring to Figure 7 and Figure 8 , taking the upper cover plate 6 as an example, the fins 8 adjacent to each other form fin channels 34 in the Y-axis direction; and referring to Figure 5 and Figure 6 , the space between the upper and lower cover plates 7 cooperates to form a cover plate flow channel 33, which is part of the internal flow channel 4 of the main body 1. The internal flow channel 4 of the main body 1 includes a first flow channel 17, a cover plate flow channel 33, a second flow channel 18, and a third flow channel 19.

[0063] Referring to Figure 5 and Figure 6 , the width of each fin 8 in the Y-axis direction gradually decreases from the bottom to the top, and the fin 8 can be regarded as a trapezoidal shape in the cross section perpendicular to the X-axis direction. The bottom of the fin 8 is narrow in shape, and when heat is transferred from the outer surface to the inner surface of the upper cover plate 6 and the lower cover plate 7, the fin 8 has a larger contact area, and the space between the fins 8 is larger, which can improve the flow of the flow channel 4, and the two cooperate to effectively improve the heat dissipation efficiency of the heat dissipation cover plate 5.

[0064] Referring to Figure 7 and Figure 8 , each of the fins 8 has a tooth structure 9 on both sides in the Y-axis direction for increasing the surface area of the fin 8. The tooth structure 9 is formed in the direction along the side of the fin 8 from the bottom to the top, and each protruding edge of the tooth structure 9 extends along the X-axis direction. The tooth structure 9 can increase the area of the fin 8 in contact with the cooling liquid and improve the heat dissipation efficiency. In addition, the tooth structure 9 on the fin 8 can also effectively destroy the boundary layer of the cooling liquid near the surface of the fin 8.

[0065] Referring to Figure 7 , at least one set of fins 8 on the upper cover plate 6 and the lower cover plate 7 in the heat dissipation cover plate 5 has a notch 11 penetrating in the Y-axis direction at a predetermined length interval in the X-axis direction. The positions of the notches 11 on the upper cover plate 6 and the lower cover plate 7 are corresponding to each other. The originally independent flow of the cooling liquid in the fin channels 34 between the fins 8 will be mixed at the position of the notches 11, thereby reducing the influence of the boundary layer of the cooling liquid and further improving the heat dissipation efficiency of the heat dissipation cover plate 5.

[0066] The liquid cooling heat dissipation device provided by the embodiment comprises a main body 1, the main body 1 is provided with an inlet 2, an outlet 3 and a flow channel 4 connecting the inlet 2 and the outlet 3, during operation, the cooling liquid with low temperature is filled into the main body 1 through the inlet 2, the cooling liquid is transported through the flow channel 4 and reaches the outlet 3, and in the process, the cooling liquid absorbs the heat emitted by the heat dissipation component on the main body 1, the cooling liquid with high temperature is sent out of the main body 1 through the outlet 3; the main body 1 comprises at least one set of heat dissipation cover plates 5, the heat dissipation cover plate 5 comprises an upper cover plate 6 and a lower cover plate 7, the two are arranged oppositely in the Z-axis direction, and at least one of the opposite surfaces of the two is provided with fins 8, and the space between the two forms the flow channel 4; compared with the sandwich structure liquid cooling plate in the background art, in the liquid cooling heat dissipation device provided by the technical scheme, the fins 8 are directly formed on the upper cover plate 6 and / or the lower cover plate 7, and the flow channel 4 plate is not needed, and the structural strength of the upper cover plate 6 and / or the lower cover plate 7 is enhanced through the fins 8, the fins 8 itself plays a role in increasing the contact area of the heat dissipation cover plate 5 and the cooling liquid, which is conducive to improving the heat dissipation efficiency. In the conventional sandwich structure liquid cooling plate, a plurality of fins 8 are arranged on the two sides of the flow channel 4 plate, the upper cover plate 6 and the lower cover plate 7 are attached to the top end of the fins 8, and the heat dissipation component is arranged on the upper cover plate 6, for example, the upper cover plate 6, the fins 8 and the side surface of the flow channel 4 plate cooperate to form a plurality of flow channels 4, the heat dissipation path of the liquid cooling plate of this structure comprises: the heat dissipation component transmits heat to the upper cover plate 6, the upper cover plate 6 transmits to the cooling liquid in contact with it and the top of the fin 8 in contact with it, a part of the heat is directly taken away by the cooling liquid, and a part of the heat is transmitted to the flow channel 4 plate, the flow channel 4 plate is heated, and then transmitted to the cooling liquid through the part in contact with the cooling liquid, and then taken away by the cooling liquid. Compared with the technical scheme, the heat dissipation path is adjusted, and the heat dissipation efficiency is higher; specifically, the heat dissipation component is arranged on the upper cover plate 6, for example, the heat dissipation component transmits heat to the upper cover plate 6, and the upper cover plate 6 directly transmits to the cooling liquid in contact with it, and it should be noted that at this time, the part of the cooling liquid in contact with the upper cover plate 6 includes the area increased by the fins 8 arranged on the upper cover plate 6 in addition to the side surface of the upper cover plate 6; in the process, since the fins 8 are directly arranged on the upper cover plate 6, the flow channel 4 plate is no longer needed to indirectly conduct heat, thereby effectively improving the heat dissipation efficiency; at the same time, through the large amount of surface of the fins 8, the heat dissipation efficiency of the upper cover plate 6 or the lower cover plate 7 can also be directly improved. In addition, when only one of the upper cover plate 6 or the lower cover plate 7 is provided with fins 8, the heat dissipation component is arranged on the cover plate provided with fins 8, so as to ensure the structural strength of the corresponding cover plate; when the fins 8 are arranged on both the upper cover plate 6 and the lower cover plate 7, both the upper cover plate 6 and the lower cover plate 7 have good heat dissipation effect and structural strength, and the heat dissipation component can be arranged on both the upper cover plate 6 and the lower cover plate 7, thereby reducing the volume of the corresponding power component.

[0067] Embodiment 2:

[0068] Embodiment 2 of the present application provides a liquid cooling heat dissipation device, which is implemented based on Embodiment 1, and differs from Embodiment 1 in that the heat dissipation cover plate 5 further comprises a partition plate 25.

[0069] With reference to Figure 9 and Figure 10 , the heat dissipation cover plate 5 further comprises a partition plate 25 between the upper cover plate 6 and the lower cover plate 7 of the set of heat dissipation cover plates 5, and the partition plate 25 is adapted in size to the upper cover plate 6 and the lower cover plate 7 in the X-axis direction and the Y-axis direction, so as to divide the flow channel 4 in the heat dissipation cover plate 5 into two parts in the Z-axis direction.

[0070] With reference to Figure 11 and Figure 12 , in the heat dissipation cover plate 5, the partition plate 25 separates the upper cover plate 6 and the lower cover plate 7 in the up-down direction, and compared with the case where the space between the upper cover plate 6 and the lower cover plate 7 forms the cover plate flow channel 33 in Embodiment 1, the cover plate flow channel 33 is divided into two relatively independent parts in the set of heat dissipation cover plates 5 in Embodiment 2. After the cooling liquid is fed into the heat dissipation cover plate 5, it is divided by the partition plate 25 to flow between the fin-to-fin channels 34 of the upper cover plate 6 and the lower cover plate 7, and at this time, the fin-to-fin channels 34 cooperate with the partition plate 25 to form a plurality of relatively independent cooling liquid flow channels on the upper cover plate 6 or the lower cover plate 7. The partition plate 25 arranged between the upper cover plate 6 and the lower cover plate 7 can divide the flow channel 4 in the heat dissipation cover plate 5 into two independent parts, and by reducing the flow area of the flow channel 4, the cooling liquid in the flow channel 4 can flow faster under the same flow condition, so as to take away heat faster; at the same time, when the upper cover plate 6 and the lower cover plate 7 are both provided with heat dissipation components to be cooled, the two parts of the flow channel 4 can relatively independently cool the two sets of heat dissipation components to be cooled, avoiding mutual influence, while being able to assist the heat dissipation of the side with higher temperature by the side with lower temperature through the partition plate 25.

[0071] In each set of heat dissipation cover plates 5, the thickness of the partition plate 25 at the liquid inlet end is configured to form a gap 10 between the two sides in the Z-axis direction and the top of the fins 8 on the upper cover plate 6 and the lower cover plate 7, which gradually decreases along the flow direction; along the flow direction, after the gap 10, the thickness of the partition plate 25 is configured to be in contact with the top of the fins 8 on the upper cover plate 6 and the lower cover plate 7 in the Z-axis direction.

[0072] Specifically, with reference to Figure 13 , Figure 14 and Figure 15 , taking the connection position of the first flow channel 17 on the first frame 12 and the heat dissipation cover plate 5 located at the rear side as an example, which is the liquid inlet end of the cover plate flow channel 33 of the heat dissipation cover plate 5. With reference to Figure 14The left end edge of the partition plate 25 forms a liquid inlet portion 30 and a guide portion 31 from left to right, respectively, and an abutting portion 32 on the partition plate 25 after the guide portion 31, the thickness of the liquid inlet portion 30 is less than the thickness of the abutting portion 32, and the guide portion 31 smoothly transitions the liquid inlet portion 30 and the abutting portion 32. At the position of the abutting portion 32, the top end of the fin 8 on the upper cover plate 6 and the lower cover plate 7 abuts on the upper and lower surfaces of the partition plate 25, so that each fin-to-fin channel 34 forms a flow channel, respectively; at the positions of the liquid inlet portion 30 and the guide portion 31, the upper and lower surfaces of the partition plate 25 form a gap 10 with the top of the fin 8, the size of the gap 10 remains the same at the position of the liquid inlet portion 30, gradually decreases at the position of the guide portion 31, and disappears at the position of the abutting portion 32. Through the gap 10, the cooling liquid does not immediately appear at the position close to the surface of the partition plate 25 when it just enters the flow channel 4, and the boundary layer will cause the flow velocity of the cooling liquid to be different at different positions in the Z-axis direction when the cooling liquid flows in the flow channel 4, resulting in a decrease in the heat conduction effect of the cooling liquid; then the cooling liquid is guided to the part where the partition plate 25 and the top of the fin 8 meet, and because the cooling liquid has passed through the gap 10 before, the boundary layer phenomenon of the cooling liquid is weakened to the minimum, and the cooling liquid can have a higher heat dissipation efficiency; in addition, the toothed structure 9 provided on the fin 8 can also effectively destroy the boundary layer of the cooling liquid close to the surface of the fin 8.

[0073] In addition, with reference to Figure 9 、 Figure 10 and Figure 12 , a plug-in flange 26 is arranged at the edge of the partition plate 25 corresponding to the third frame 14 or the fourth frame 15 in the Y-axis direction, and a corresponding plug-in slot 27 is arranged on the third frame 14 and the fourth frame 15. The plug-in flange 26 on the partition plate 25 can be inserted into the plug-in slot 27, and then fixed by welding or other means, facilitating the installation of the partition plate 25. Meanwhile, screw holes are also arranged on the plug-in flange 26, and corresponding screw holes are arranged on the third frame 14 and the fourth frame 15, so that after the plug-in flange 26 is inserted into the corresponding plug-in slot 27, further locking can be achieved through screws.

[0074] Embodiment 3

[0075] The embodiment 3 of the present application provides a power assembly, which comprises a plurality of power tubes 21, which are attached to the heat dissipation cover plate 5 of the liquid cooling heat dissipation device provided in the above-mentioned embodiment 1 or embodiment 2.

[0076] Specifically, with reference to Figure 16Fig. 2 shows a case of fixing the power tubes 21 to the liquid cooling heat sink, in this case, the power tubes 21 are arranged on the upper cover plate 6 of the rear heat sink cover plate 5, and in the part not shown, the power tubes 21 are also arranged on the lower cover plate 7 of the rear heat sink cover plate 5, and on the upper cover plate 6 of the front heat sink cover plate 5. The power tubes 21 correspond to three-phase electricity and are provided with three large groups, each of which includes 12 power tubes 21, which are further divided into four small groups, each of which includes three power tubes 21, which form the switching tubes in the commutation circuit. Among them, the three power tubes 21 in each small group, one power tube 21 is located on the upper cover plate 6 of the rear heat sink cover plate 5, one power tube 21 is located on the lower cover plate 7 of the rear heat sink cover plate 5, and one power tube 21 is located on the upper cover plate 6 of the front heat sink cover plate 5. At the same time, the three large groups are arranged in sequence along the X-axis direction.

[0077] As a preferred embodiment, the three large groups corresponding to three-phase electricity are spaced apart and have corresponding gaps in space, which correspond to the heat sink cover plate 5, i.e. the position of the notch 11 of the fin 8 on the upper cover plate 6 and the lower cover plate 7, so that the mixing of the cooling liquid at the notch 11 will not affect the heat dissipation of the power tube 21.

[0078] The above description and embodiment are used to explain the scope of protection of the present application, but do not constitute a limitation on the scope of protection of the present application. Through the inspiration of the present application or the above-mentioned embodiments, those skilled in the art combine with common knowledge, ordinary technical knowledge and / or prior art in the art, through logical analysis, reasoning or limited experiments, the modifications, equivalent replacements or other improvements of the embodiments of the present application or one part of the technical features can be obtained, which should be included in the scope of protection of the present application.

Claims

1. A liquid cooling device, comprising: a main body (1) provided with an inlet (2), an outlet (3) and a flow channel (4) connecting the inlet (2) and the outlet (3); the main body (1) comprises at least one set of heat dissipation cover plates (5), each set of the heat dissipation cover plates (5) comprises an upper cover plate (6) and a lower cover plate (7) oppositely arranged along a Z-axis direction, at least one of the opposite surfaces of the upper cover plate (6) and the lower cover plate (7) is provided with a plurality of fins (8) protruding along the Z-axis direction, and the upper cover plate (6) and the lower cover plate (7) cooperatively form at least part of the flow channel (4); in each set of the heat dissipation cover plates (5), the upper cover plate (6) and the lower cover plate (7) are both provided with a plurality of the fins (8), each of the fins (8) extends along an X-axis direction and is arranged along a Y-axis direction, and the width of each of the fins (8) in the Y-axis direction gradually decreases from the bottom to the top; each set of the heat dissipation cover plates (5) further comprises a partition plate (25) located between the upper cover plate (6) and the lower cover plate (7) of the set of the heat dissipation cover plates (5), the partition plate (25) is adapted in size in the X-axis direction and the Y-axis direction to the upper cover plate (6) and the lower cover plate (7) so that the flow channel (4) in the set of the heat dissipation cover plates (5) is divided into two parts in the Z-axis direction; at the inlet end of each set of the heat dissipation cover plates (5), the thickness of the partition plate (25) is configured to form a gap (10) between the two sides of the partition plate (25) in the Z-axis direction and the top of the fins (8) on the upper cover plate (6) and the lower cover plate (7) gradually decreasing along the flow direction; along the flow direction, after the gap (10), the thickness of the partition plate (25) is configured to make the two sides of the partition plate (25) in the Z-axis direction meet the top of the fins (8) on the upper cover plate (6) and the lower cover plate (7). Each of the fins (8) is provided with a tooth structure (9) on the two sides in the Y-axis direction for increasing the surface area of the fin (8). In at least one set of the heat dissipation cover plates (5), each of the fins (8) on the upper cover plate (6) and the lower cover plate (7) is provided with a notch (11) penetrating along the Y-axis direction at a preset length interval in the X-axis direction. The main body (1) comprises a first frame (12), a second frame (13), a third frame (14) and a fourth frame (15) sequentially fixed at the head and tail; the first frame (12) and the second frame (13) are used for fixing and sealing the edges of the heat dissipation cover plates (5) in the X-axis direction, and the third frame (14) and the fourth frame (15) are used for fixing and sealing the edges of the heat dissipation cover plates (5) in the Y-axis direction. ​ ​ 2. The liquid cooling heat sink of claim 1, wherein, ​ 3. The liquid cooling heat sink of claim 2, wherein the liquid cooling heat sink is configured to be mounted on a surface of the electronic device. ​ 4. The liquid cooling heat dissipation device as described in claim 3, characterized in that, ​ 5. The liquid cooling heat sink of claim 4, wherein the liquid cooling heat sink is configured to be mounted on a surface of the electronic device. The main body (1) further comprises a fifth frame (16); the main body (1) comprises two groups of heat dissipation cover plates (5) arranged along the Y-axis direction, and the fifth frame (16) is located between the two groups of heat dissipation cover plates (5) and used for fixing and sealing the edges of the two groups of heat dissipation cover plates (5) in the Y-axis direction; the first frame (12) is provided with the liquid inlet (2) and the liquid outlet (3), and is provided with a first flow passage (17) corresponding to the liquid inlet (2) and a second flow passage (18) corresponding to the liquid outlet (3); the second frame (13) is provided with a third flow passage (19); in the two groups of heat dissipation cover plates (5), the flow channels (4) in one group of heat dissipation cover plates (5) are communicated with the first flow passage (17) and the third flow passage (19), and the liquid flow direction is from the first frame (12) to the second frame (13), and the flow channels (4) in the other group of heat dissipation cover plates (5) are communicated with the third flow passage (19) and the second flow passage (18), and the liquid flow direction is from the second frame (13) to the first frame (12).

6. The liquid cooling heat sink of claim 5, wherein, The main body (1) is provided with a flow discharge port (20) near the liquid outlet (3), the flow discharge port (20) is communicated with the flow channel (4), and the position is configured to be suitable for emptying the flow channel (4).

7. A power assembly comprising a number of power tubes (21), characterized in that The power tube (21) is attached to the heat dissipation cover plate (5) of the liquid cooling heat dissipation device according to any one of claims 1-6.

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