Radiator, radiating module and DC-DC converter

Abstract

The radiator comprises at least one heat transfer assembly, each heat transfer assembly comprises two heat transfer pieces, the heat transfer pieces are made of heat conduction materials and form a continuous heat conduction structure, and the continuous heat conduction structure comprises a heat absorption part and a heat dissipation part which are communicated with each other; the heat absorption parts of the two heat transfer pieces are arranged along a first direction, and the heat dissipation parts of the two heat transfer pieces are close to each other or communicated with each other along the first direction for centralized heat exchange; and the continuous heat conduction structure is configured to realize heat transfer from the heat absorption part to the heat dissipation part through a heat conduction path of the heat conduction material and / or a medium heat transfer path in the continuous heat conduction structure. The heat dissipation device can dissipate heat of two heat sources at the same time and is small in size and high in heat dissipation efficiency.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of heat dissipation, and particularly relates to a radiator, a heat dissipation module and a DC-DC converter. BACKGROUND

[0002] In a vehicle-mounted power supply system of a new energy automobile, a DC-DC converter, as a core component, undertakes an important task of high-low voltage power conversion. A power device (such as a MOSFET, an inductor, etc.) installed on a circuit board of the DC-DC converter generates a large amount of heat when working. When multiple circuit boards are included in the DC-DC converter, how to realize efficient and stable heat dissipation of the multiple circuit boards under the condition of small volume becomes a key problem in the design of the vehicle-mounted power supply due to the compact layout requirement of the vehicle-mounted power supply. SUMMARY

[0003] The utility model discloses a radiator, a heat dissipation module and a DC-DC converter, which can simultaneously dissipate heat from two heat sources and have small volume and high heat dissipation efficiency.

[0004] To achieve the above-mentioned purpose, the utility model and its preferred embodiments adopt the following technical solutions, but the embodiments are not limited to the following solutions:

[0005] Technical solution one and related embodiments thereof relate to a radiator, which includes at least one heat transfer assembly. Each heat transfer assembly includes two heat transfer pieces. The heat transfer pieces are made of a heat-conductive material and form a continuous heat-conductive structure. The continuous heat-conductive structure includes a heat absorption part and a heat dissipation part that are in communication with each other. The heat absorption parts of the two heat transfer pieces are arranged along a first direction. The heat dissipation parts of the two heat transfer pieces are close to or in communication with each other along the first direction to concentrate heat exchange. The continuous heat-conductive structure is configured to realize heat transfer from the heat absorption part to the heat dissipation part through a heat conduction path of the heat-conductive material and / or a medium heat transfer path in the continuous heat-conductive structure.

[0006] Based on technical solution one, technical solution two is also provided. In technical solution two and related embodiments thereof, the heat absorption parts of the two heat transfer pieces are parallel to each other. The heat absorption parts are provided with at least one heat-conductive surface that is perpendicular to the first direction.

[0007] Based on technical solution two, technical solution three is also provided. In technical solution three and related embodiments thereof, the heat dissipation parts are arc-shaped. The heat dissipation parts of the two heat transfer pieces are in communication with each other to make the two heat transfer pieces of the heat transfer assembly integrally formed and form a U-shaped opening structure.

[0008] Based on the third technical solution, the fourth technical solution and the related embodiments thereof are further provided. The heat transfer member dissipates heat through fluid phase change. The heat dissipating device comprises at least two heat transfer assemblies, each of which is arranged along a second direction perpendicular to the first direction. The heat absorbing portions of the same side are located on the same plane.

[0009] Based on the fourth technical solution, the fifth technical solution and the related embodiments thereof are further provided. The two heat absorbing portions of each heat transfer assembly are respectively provided with a first contraction section and a second contraction section at the end away from the heat dissipating portion. The length of the first contraction section along the second direction is less than the length of the second contraction section along the second direction. The first contraction sections and the second contraction sections of the heat transfer assemblies are alternately arranged along the second direction.

[0010] Based on the third technical solution, the sixth technical solution and the related embodiments thereof are further provided. The fixing seat made of metal is further provided. The heat transfer member dissipates heat through heat conduction. The heat transfer assembly is integrally formed with the fixing seat and located on the outside of the fixing seat. The heat absorbing portion extends along a third direction perpendicular to the first direction. The heat conducting surface is located on the side where the two heat absorbing portions face away from each other. The heat dissipating portion of the heat transfer assembly is at least partially located on one side of the fixing seat along the third direction.

[0011] Based on the third technical solution, the seventh technical solution and the related embodiments thereof are further provided. The fixing seat made of metal is further provided. The heat transfer member dissipates heat through heat conduction or through fluid phase change. Each part of the heat transfer assembly is attached to the outer wall of the fixing seat made of metal. The heat absorbing portion extends along a third direction perpendicular to the first direction. The heat conducting surface is located on the side where the two heat absorbing portions face away from each other. The heat dissipating portion of the heat transfer assembly is at least partially located on one side of the fixing seat along the third direction.

[0012] Based on the seventh technical solution, the eighth technical solution and the related embodiments thereof are further provided. The fixing seat is provided with a receiving groove extending along the third direction on both sides along the first direction. The third direction is perpendicular to the first direction and the second direction. The heat absorbing portion of each heat transfer assembly is located in the receiving groove and the heat conducting surface is attached to the groove bottom of the receiving groove.

[0013] Based on any one of the sixth to eighth technical solutions, the ninth technical solution and the related embodiments thereof are further provided. The fixing seat is provided with a through channel extending along a second direction perpendicular to the first direction and the third direction and penetrating through. Each part of the heat transfer assembly is attached to the outer wall of the through channel or integrated with the outer wall of the through channel.

[0014] Based on the ninth technical solution, the tenth technical solution and the related embodiments thereof are further provided. The fixing seat is provided with a reinforcing portion protruding from the inner wall of the through channel at the middle along the second direction.

[0015] Based on technical solution ten, there is also technical solution eleven, in technical solution eleven and its related embodiments, the through channel opens at one end away from the heat dissipation part in the third direction; the reinforcing part is provided with two reinforcing ribs protruding from the inner walls on both sides of the through channel in the first direction, each reinforcing rib extends in the third direction and is provided with a first connecting part extending out of the through channel, the first connecting part is integrated with the end face of the opening end of the through channel and is used for connecting with the heat source.

[0016] Based on technical solution eleven, there is also technical solution twelve, in technical solution twelve and its related embodiments, the fixing seat is provided with a second connecting part and a third connecting part on both sides in the first direction of the end close to the heat dissipation part, the second connecting part and the third connecting part are both used for connecting with the heat source and have different structures.

[0017] Technical solution thirteen and its related embodiments provide a heat dissipation module, which comprises the heat sink of any one of technical solutions one to twelve and two electrical components, the two electrical components are respectively attached to the surfaces of the two heat absorption parts away from each other.

[0018] Based on technical solution thirteen, there is also technical solution fourteen, in technical solution fourteen and its preferred embodiments, the electrical component comprises a circuit board and a heating element installed on one side surface of the circuit board, the heat absorption part penetrates the circuit board and is attached to the surface of the heating element close to the circuit board.

[0019] Technical solution fourteen and its related embodiments provide a DC-DC converter, which comprises the heat dissipation module of technical solution thirteen or fourteen.

[0020] From the above description of the utility model and its preferred embodiments, compared with the prior art, the technical solutions and preferred embodiments of the utility model have the following beneficial effects due to the use of the following technical means:

[0021] In the technical solution one and the preferred embodiments thereof, the "continuous heat conduction structure" means a physical structure formed by the heat conduction material of the heat transfer member, which is between the heat absorbing part and the heat dissipating part without heat flow interruption, and which realizes the directional migration of heat from the heat absorbing part to the heat dissipating part through at least one of the following two heat transfer modes: one is solid-state heat conduction, in which case the heat dissipating part exchanges heat with the outside to dissipate heat; the other is medium heat transfer, which relies on the gas-liquid phase change or convection circulation of the working medium enclosed inside the heat transfer member, in which case the heat transfer member has a closed fluid circulation path inside, the fluid flows in the heat transfer member without exchanging medium with the outside environment, the heat absorbing part can absorb external heat through fluid phase change or forced flow, and the heat dissipating part can release heat through the fluid with a heat sink or external circulation (such as a liquid cooling pump, a fan, a heat sink, a secondary cooling system, etc.), so in this case, the heat transfer member can realize the functions of heat absorption and heat dissipation through fluid phase change (such as heat pipe evaporation / condensation), or through forced flow (such as liquid cooling pump driving).

[0022] In the technical solution, the heat absorbing parts of the two heat transfer members are arranged along the first direction, so that the two heat absorbing parts of the heat transfer assembly can dissipate heat for the two heat sources at the same time, and thus one heat sink can dissipate heat for two heat sources, which is smaller in volume compared to two heat sources using two heat sinks respectively, the heat dissipating parts of the two heat transfer members are close to or connected along the first direction, forming a concentrated heat exchange area, which is high in heat exchange efficiency, the heat dissipating efficiency of the heat sink is higher, and the dispersion layout of the heat sink ends (heat dissipating parts) is reduced, thereby compressing the overall volume of the heat sink. When the two heat dissipating parts are close to each other, it is suitable for the case where the power difference between the two heat sources is large, so as to avoid the mutual interference of the heat flows of the two asymmetric heat sources, and the two independent heat transfer members can improve the redundancy reliability when one of the heat transfer members fails; when the two heat dissipating parts are connected to each other, it is suitable for the case where the power difference between the two heat sources is small, and when the two heat dissipating parts are connected to each other, the structure is simpler, the process cost is lower, and the required space is smaller.

[0023] In the technical solution two and the preferred embodiments thereof, the heat absorbing parts of the two heat transfer members are parallel to each other, the parallel arrangement makes the heat absorbing parts of the two heat transfer members more symmetrical, which is more conducive to the symmetrical installation of the two heat sources, and compared to the structure where the two heat absorbing parts are not parallel, it is more conducive to reducing the occupied space of the heat sink in the first direction; the heat conduction surfaces perpendicular to the first direction can increase the effective heat dissipation area and provide heat dissipation efficiency; when the number of heat conduction surfaces is two, the two heat conduction surfaces are oppositely arranged, which can balance the heat flow distribution on both sides of the heat absorbing part and avoid local overheating.

[0024] In the third aspect and the preferred embodiments thereof, the heat dissipation part is arc-shaped, the heat dissipation parts of the two heat transfer members are communicated with each other so that the two heat transfer members of the heat transfer assembly are integrally formed and form a U-shaped opening structure, the structure is simpler, the process cost is lower, and the required space is smaller, the length of the heat dissipation part can be extended under the condition that the length of the heat sink in the first direction is constant, the heat dissipation efficiency is increased, and when the continuous heat conduction structure is configured to realize heat transfer from the heat absorption part to the heat dissipation part through the medium heat transfer path in the continuous heat conduction structure, the flow resistance of the fluid in the heat transfer member can be reduced, and thus the heat exchange efficiency and the heat dissipation efficiency of the heat sink are improved.

[0025] In the fourth aspect and the preferred embodiments thereof, the heat transfer member dissipates heat through fluid phase change, the heat dissipation efficiency is higher than that of solid heat conduction or convection circulation, and compared with the convection circulation, the heat sink does not need an external pump or mechanical drive, and the structure is simple; the heat sink includes at least two heat transfer assemblies, and each heat transfer assembly is arranged along a second direction perpendicular to the first direction; the heat conduction surfaces of the heat absorption parts located on the same side are located on the same plane, on the one hand, the heat dissipation area of the heat sink can be expanded by increasing the number of heat transfer assemblies according to needs, and on the other hand, since the heat transfer member dissipates heat through fluid phase change, compared with the scheme of a heat transfer assembly with a relatively long length in the second direction, the redundancy reliability when the heat transfer assembly fails is improved; in addition, the heat conduction surfaces on the same side are coplanar, which can ensure that the heat transfer assemblies are in uniform contact with the heat source and reduce the assembly tolerance requirement.

[0026] In the fifth aspect and the preferred embodiments thereof, since the heat transfer member dissipates heat through fluid phase change, the heat transfer member is in the form of a heat pipe, and during the processing of the heat transfer assembly, two contraction sections are inevitably formed at the two ends of the heat transfer assembly, the two contraction sections have a relatively small contribution to heat dissipation, in the present technical solution, the length of the first contraction section along the second direction is smaller than the length of the second contraction section along the second direction, and the first contraction sections and the second contraction sections of the heat transfer assemblies are alternately arranged along the second direction, which is beneficial to balancing the influence of the first contraction sections and the second contraction sections on the heat dissipation efficiency on both sides of the heat sink along the first direction, and is more beneficial to balancing the heat dissipation on both sides of the heat sink.

[0027] In the sixth aspect and the preferred embodiments thereof, the fixing seat is made of metal material, the high thermal conductivity of the metal material (such as aluminum or copper) ensures that the fixing seat can quickly absorb and transfer heat, avoids local overheating, and makes the fixing seat serve as a support base of the heat sink, the fixing seat provides mechanical strength and resists thermal stress deformation. The integrally formed fixing seat and heat transfer member eliminate the contact thermal resistance and increase the heat conduction cross-sectional area of the heat transfer assembly and the fixing seat, thereby improving the heat transfer efficiency from the heat transfer member to the fixing seat. In addition, this also means that the two heat absorption parts are respectively attached to the two surfaces of the fixing seat along the first direction and away from each other, which can balance the stress distribution on both sides of the heat transfer assembly and prevent the heat transfer assembly from deforming.

[0028] In the sixth aspect and the preferred embodiments thereof, the fixing seat is made of metal material, so that the fixing seat is beneficial to be processed and cast into a structure that is attached to the inner wall of the heat transfer assembly and has large structural strength; each part of the heat transfer assembly is attached to the outer wall of the fixing seat, which means that the two heat absorbing parts and the two heat dissipating parts of the heat transfer assembly are attached to the outer wall of the fixing seat, which can improve the structural stability of the heat transfer assembly and enable the heat of the heat transfer assembly to be transferred to the fixing seat and dissipated by the fixing seat, which is beneficial to enable the heat of the heat dissipating part to be transferred to the fixing seat, thereby improving the heat dissipation efficiency of the heat dissipating part and further improving the heat dissipation efficiency of the heat transfer assembly; in addition, this also means that the two double heat absorbing parts are respectively attached to the two surfaces of the fixing seat that face away from each other along the first direction, which can balance the stress distribution on both sides of the heat transfer assembly and prevent the heat transfer assembly from deforming. It should be understood that when the heat transfer assembly realizes the heat absorbing and dissipating functions through the phase change of the fluid (such as the evaporation / condensation of the heat pipe), although the fixing seat is made of metal material, due to the characteristics of the heat transfer assembly, the heat transfer assembly transfers heat through the phase change (liquid evaporation-gas flow-condensation backflow) of the internal working medium, and the equivalent thermal conductivity thereof can reach 10,000-100,000 W / (m·K), which is much higher than that of the metal material, so the fixing seat made of metal material has little effect on the temperature difference between the heat dissipating part and the heat absorbing part. When the heat transfer assembly realizes the heat absorbing and dissipating functions through forced driving (such as liquid cooling pump driving) or through solid-state heat conduction, the high thermal conductivity of the metal material fixing seat can quickly spread the local heat to the entire heat absorbing part, avoid the accumulation of heat near the contact point of the heat absorbing part, and reduce the risk of local overheating. The fixing seat made of metal material can serve as a support structure for the heat dissipating part (such as a liquid cooling radiator), while assisting the transfer of heat from the heat dissipating part to the external environment. When the heat transfer assembly realizes heat dissipation through solid-state heat conduction, the heat transfer assembly and the fixing seat can be made of different materials, such as selecting the heat transfer assembly to be made of high thermal conductivity material and the fixing seat to be made of high strength material, to further balance the heat conduction and strength.

[0029] In the eighth aspect and the preferred embodiments thereof, the accommodating groove extends along the third direction, and the heat absorbing part of each heat transfer assembly is located in the accommodating groove and attached to the groove bottom of the accommodating groove, so that the accommodating groove can play a certain pre-positioning role for the heat transfer assembly during the process of attaching the heat transfer assembly to the outer wall of the fixing seat. The attachment of the heat absorbing part to the groove bottom of the accommodating groove can further enhance the mechanical stability and avoid deformation of the heat transfer assembly due to vibration. In addition, the two groove side walls of the metal material accommodating groove can also be used to be attached to the heat source, further increasing the heat dissipation efficiency.

[0030] In the ninth aspect and the preferred embodiments thereof, the fixing seat is provided with a through channel extending along the second direction and penetrating through, so that the heat of the heat dissipating part can be transferred to the fixing seat and then dissipated by the through channel in the fixing seat, the heat exchange efficiency of the heat dissipating part is high, and the heat dissipation efficiency of the heat sink is further improved; in addition, the provision of the through channel can also reduce the production material, reduce the production cost and reduce the weight of the fixing seat.

[0031] In technical solution ten and the preferred embodiments thereof, the reinforcing part is arranged to compensate for the reduction in strength caused by the through channel structure, and the reinforcing part is arranged at the middle of the fixing base along the second direction, so that the reinforcing effect on the fixing base is better.

[0032] In technical solution eleven and the preferred embodiments thereof, the first connecting part is integrated with the end face of the opening end of the through channel and is used to be connected with the heat source, so that the reinforcing part can not only reinforce the structural stability of the fixing base, but also realize the connection with the heat source, and the first connecting part is integrated with the end face of the opening end of the through channel, so that the first connecting part has a longer length along the first direction, and the structural strength of the first connecting part is large, and the heat source is more stable after being connected with the first connecting part.

[0033] In technical solution twelve and the preferred embodiments thereof, the second connecting part and the third connecting part are arranged on the two sides of the end of the fixing base close to the heat dissipation part along the first direction, respectively, the second connecting part and the third connecting part are both used to be connected with the heat source and have different structures, and the heat source is connected with the first connecting part, so that the heat source is connected with the two sides of the fixing base along the third direction, and the structure is more stable, and the structures of the second connecting part and the third connecting part are different, so that when two heat sources with the same structure are installed, an anti-fumble design can be formed to avoid misinstallation.

[0034] Technical solution thirteen and the preferred embodiments thereof have the technical advantages of technical solution one to technical solution twelve.

[0035] In technical solution fourteen and the preferred embodiments thereof, the heat absorbing part penetrates the circuit board and is attached to the back of the heat generating element, so that the heat transfer path is shortened, the thermal resistance is reduced, the heat transfer part is embedded in the internal circuit board, and the occupied space of the heat sink is reduced.

[0036] Technical solution fifteen and the preferred embodiments thereof inherit the technical advantages of technical solution thirteen or technical solution fourteen. BRIEF DESCRIPTION OF DRAWINGS

[0037] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings needed 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.

[0038] Figure 1 It is a perspective exploded view of the heat dissipation module of embodiment 1 of the present application.

[0039] Figure 2 It is a schematic view of the heat dissipation module of embodiment 1 of the present application.

[0040] Figure 3 It is a top view of Figure 2 .

[0041] Figure 4 Fig. 8 is a perspective view of a heat sink module according to an embodiment of the present application;

[0042] Figure 5 Fig. 9 is a schematic view of a heat sink according to an embodiment of the present application;

[0043] Figure 6 Fig. 10 is a schematic view of a heat transfer assembly according to an embodiment of the present application;

[0044] Figure 7 Fig. 11 is a schematic view of a heat sink according to an embodiment of the present application;

[0045] Figure 8 Fig. 12 is a schematic view of a heat sink according to an embodiment of the present application.

[0046] Explanation of Reference Numerals:

[0047] Heat sink 10; heat transfer assembly 11; heat transfer member 111; heat absorbing portion 112; heat conducting surface 1121; heat dissipating portion 113; first shrinkage section 114; second shrinkage section 115; fixing seat 12; accommodating groove 121; groove sidewall 1211; through passage 122; reinforcing portion 123; reinforcing rib 124; first connecting portion 1241; first threaded hole 1242; second connecting portion 125; third connecting portion 126; second threaded hole 127; guide column 128; electrical component 20; circuit board 21; opening 211; through hole 212; heat generating element 22. 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, specification and above drawings of the present application, unless otherwise explicitly defined, the terms such as “first”, “second” or “third” are used only to distinguish different objects, and are not used to describe a specific order.

[0050] Unless otherwise expressly defined, in the claims, description, and accompanying drawings of this utility model, the use of directional terms such as "center," "lateral," "longitudinal," "horizontal," "vertical," "top," "bottom," "inner," "outer," "upper," "lower," "front," "rear," "left," "right," "clockwise," and "counterclockwise" to indicate orientation or positional relationships is based on the orientation and positional relationships shown in the accompanying drawings and is only for the convenience of describing this utility model and simplifying the description. It does not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the specific protection scope of this utility model.

[0051] Unless otherwise expressly defined, the terms "fixed connection" or "fixed connection" used in the claims, description and drawings of this utility model shall be interpreted broadly to refer to any connection in which there is no displacement or relative rotation relationship between the two parties, including non-removable fixed connection, detachable fixed connection, integral connection and fixed connection through other devices or components.

[0052] In the claims, description and accompanying drawings of this utility model, the terms "comprising", "having", and variations thereof are used to mean "including but not limited to".

[0053] In the claims and the description other than the embodiments, the terms "first direction," "second direction," and "third direction" refer only to a feature having one of the aforementioned directions being perpendicular to a feature having another direction, and do not require that they be implemented according to the "first direction," "second direction," and "third direction" described in the embodiments. In the embodiments, the first direction is perpendicular to both the second direction and the third direction. Exemplarily, the first direction can be divided into left and right, the second direction can be divided into front and back, and the third direction can be divided into up and down.

[0054] Example 1

[0055] See Figures 1-4 , Figures 1-4 A heat dissipation module is shown, which includes a heat sink 10 and two electrical components 20.

[0056] See Figures 5-6 The radiator 10 includes at least one heat transfer component 11 and a fixing base 12. The heat transfer component 11 is fixed to the outside of the fixing base 12. In this embodiment, the radiator 10 includes at least two heat transfer components 11, and each heat transfer component 11 is arranged along a second direction perpendicular to the first direction. Figure 5 In the middle, the heat sink 10 includes three heat transfer components 11, see [link to relevant documentation]. Figure 6Each heat transfer assembly 11 includes two heat transfer pieces 111 made of heat-conductive material and forming a continuous heat-conductive structure including a heat absorption part 112 and a heat dissipation part 113 in communication with each other, the continuous heat-conductive structure being configured to realize heat transfer from the heat absorption part 112 to the heat dissipation part 113 through a heat conduction path of the heat-conductive material and / or a medium heat transfer path within the continuous heat-conductive structure, and the "continuous heat-conductive structure" means a physical structure formed by the heat-conductive material of the heat transfer piece 111 without heat flow interruption between the heat absorption part 112 and the heat dissipation part 113, which realizes directional migration of heat from the heat absorption part to the heat dissipation part through at least one of the following two heat transfer modes: one is solid-state heat conduction, in which case the heat dissipation part 113 exchanges heat with the outside to realize heat dissipation; the other is medium heat transfer, which relies on the gas-liquid phase change or convection circulation of the working medium enclosed inside the heat transfer piece 111, in which case the heat transfer piece 111 has a closed fluid circulation path, the fluid flows in the heat transfer piece 111 without exchanging medium with the outside environment, the heat absorption part 112 can absorb external heat through fluid phase change or forced flow, and the heat dissipation part 113 can release heat through the fluid with a heat sink or external circulation (such as a liquid cooling pump, a fan, a heat sink, a secondary cooling system, etc.), so in this case, the heat transfer piece 111 can realize the functions of heat absorption and heat dissipation through fluid phase change (such as heat pipe evaporation / condensation) or forced flow (such as liquid cooling pump driving). The following mainly describes the case of heat dissipation through fluid phase change of the heat transfer piece 111.

[0057] When the heat transfer piece 111 dissipates heat through fluid phase change, the pipe body of the heat absorption part 112 is usually made of high-thermal-conductivity metal material, such as copper (high thermal conductivity and corrosion resistance) or aluminum (lightweight and low cost), and the pipe body material of the heat dissipation part 113 is consistent with that of the heat absorption part 112 (copper / aluminum), to ensure rapid heat dissipation. The heat absorption part 112 absorbs external heat to evaporate the working liquid into vapor, and the heat dissipation part 113 releases heat to condense the vapor into liquid. The heat transfer piece 111 is also provided with a capillary structure of a wick to "pump back" the condensed liquid from the heat dissipation part 113 to the heat absorption part 112 through capillary action, to complete the circulation. The working fluid in the heat transfer piece 111 transfers heat through liquid-gas phase change (evaporation in the heat absorption part 112 and condensation in the heat dissipation part 113), and the efficiency is hundreds of times that of pure heat conduction. In the embodiment, the working fluid is ethylene glycol.

[0058] Referring to Figure 6The heat absorbing portions 112 of the two heat transfer members 111 are arranged along a first direction. In this embodiment, the heat absorbing portions 112 of the two heat transfer members 111 are parallel to each other. The heat absorbing portions 112 extend along a third direction perpendicular to the first direction. The heat absorbing portions 112 are provided with at least one heat conduction surface 1121 perpendicular to the first direction. In this embodiment, the heat conduction surfaces 1121 are located on the side where the two heat absorbing portions 112 are away from each other. The heat conduction surfaces 1121 of the heat absorbing portions 112 located on the same side are located on the same plane. In this embodiment, the two surfaces where the two heat absorbing portions 112 are away from each other are respectively used for dissipating heat for the two electrical components 20. It should be understood that, when the distance between the two heat absorbing portions 112 along the first direction is large enough, the heat conduction surfaces 1121 can also be located on the two sides where the heat absorbing portions 112 are away from each other along the first direction. The heat dissipating portions 113 of the two heat transfer members 111 are close to each other or communicated with each other along the first direction, so as to concentrate heat exchange (such as with an external cold source). In this embodiment, the heat dissipating portions 113 are arc-shaped. The heat dissipating portions 113 of the two heat transfer members 111 are communicated with each other, so that the two heat transfer members 111 of the heat transfer assembly 11 are integrally formed and form a U-shaped opening structure.

[0059] Referring to Figure 6 The two heat absorbing portions 112 of each heat transfer assembly 11 are respectively provided with a first contraction section 114 and a second contraction section 115 at the end away from the heat dissipating portion 113. The length of the first contraction section 114 along the second direction is smaller than the length of the second contraction section 115 along the second direction. Referring to Figure 5 The first contraction section 114 and the second contraction section 115 of each heat transfer assembly 11 are alternately arranged along the second direction.

[0060] The fixing seat 12 is made of metal. Referring to Figure 5 In this embodiment, the parts of the heat transfer assembly 11 are all attached to the outer wall of the fixing seat 12. That is, the shape of the outer wall of the fixing seat 12 is consistent with the shape of the heat transfer assembly 11. The two heat absorbing portions 112 and the two heat dissipating portions 113 of the heat transfer assembly 11 are all attached to the outer wall of the fixing seat 12. The heat dissipating portions 113 of the heat transfer assembly 11 are at least partially located on one side of the fixing seat 12 along the third direction.

[0061] Referring to Figure 5The fixed seat 12 is provided with a receiving groove 121 extending along the third direction on both sides along the first direction, and the heat absorbing part 112 of each heat transfer assembly 11 is located in the receiving groove 121 and adheres to the groove bottom of the receiving groove 121, so that the two heat absorbing parts 112 of the heat transfer assembly 11 adhere to the two surfaces of the fixed seat 12 along the first direction away from each other, and the heat conducting surface 1121 of the heat transfer assembly 11 is in the same plane as the groove opening of the receiving groove 121, so that the back surface of the heating element 22 in the following is uniformly contacted. The fixed seat 12 is provided with a through channel 122 extending along the second direction and penetrating through, and the through channel 122 is opened at one end away from the heat radiating part 113 along the third direction, and each part of the heat transfer assembly 11 adheres to the outer wall of the through channel 122. The middle part of the fixed seat 12 along the second direction is provided with a reinforcing part 123 protruding from the inner wall of the through channel 122. The reinforcing part 123 is provided with two reinforcing ribs 124 protruding from the inner wall of the through channel 122 on both sides along the first direction, and each reinforcing rib 124 extends along the third direction and is provided with a first connecting part 1241 extending out of the through channel 122, and the first connecting part 1241 is integrated with the end surface of the opening end of the through channel 122 and is used for connecting with the heat source, that is, for connecting with the electrical component 20. The two sides along the first direction of the end of the fixed seat 12 close to the heat radiating part 113 are respectively provided with a second connecting part 125 and a third connecting part 126, and the second connecting part 125 and the third connecting part 126 are used for connecting with the circuit board 21 in the following and have different structures. In the embodiment, the first connecting part 1241 is provided with a first threaded hole 1242 with an axis extending along the first direction, the second connecting part 125 and the third connecting part 126 each include two second threaded holes 127 arranged along the second direction and two guide columns 128 arranged along the second direction, the axis of the second threaded hole 127 extends along the first direction, and the guide column 128 extends along the first direction, and the difference is that the distance between the guide columns 128 of the second connecting part 125 and the third connecting part 126 is not consistent.

[0062] Referring to Figures 1-4 The electrical component 20 includes a circuit board 21 and a heating element 22 mounted on one side surface of the circuit board 21, and the heat absorbing part 112 penetrates through the circuit board 21 and adheres to the surface of the heating element 22 close to the circuit board 21. In the embodiment, referring to Figure 1 The circuit board 21 is provided with a through hole 212 corresponding to the first threaded hole 1242, the second threaded hole 127 and the guide column 128.

[0063] During installation, first, fix the two circuit boards 21 to the mounting base 12 respectively. This means aligning the through holes 212 of the circuit board 21 with the first threaded hole 1242, the second threaded hole 127, and the guide post 128, respectively. Then, screw the circuit boards 21 to the mounting base 12. The spacing between the two guide posts 128 of the second connecting part 125 and the third connecting part 126 is different; that is, the structures of the second connecting part 125 and the third connecting part 126 are different to avoid incorrect installation of the two circuit boards 21. After fixing, the heat-conducting surface 1121 will be in contact with the back of the heating element 22 near the circuit board 21; the installation is then complete. (See also...) Figure 4 In practical applications, the pin voltage at which the heating element 22 is connected to the circuit board 21 is relatively high. Figure 4 (Left side) To meet safety requirements, the back of the heating element 22, near the position with higher pin voltage, is not attached to the heat-conducting surface 1121 of the heat sink 10, and a gap is formed between the heat sink 10 and the high-voltage pin along the second direction. However, it should be understood that when the pin voltage of the heating element 22 is low, it can be designed so that the heat-conducting surface 1121 of the heat sink 10 is completely attached to the surface of the heating element 22.

[0064] In this embodiment, since the heat-absorbing portions 112 of the two heat transfer elements 111 are arranged along the first direction, the two heat-absorbing portions 112 of the heat transfer assembly 11 can simultaneously dissipate heat for two heat sources. Therefore, one radiator can dissipate heat for two heat sources. Compared with using two radiators for each heat source, the volume is smaller. The heat dissipation portions 113 of the two heat transfer elements 111 are close to or connected along the first direction, forming a concentrated heat exchange area with high heat exchange efficiency. The heat dissipation efficiency of the radiator 10 is even higher, and the dispersed layout of the radiator ends (heat dissipation portions) is reduced, thereby compressing the overall volume of the radiator. When the two heat dissipation portions 113 are close to each other, it is suitable for situations where the power difference between the two heat sources is large, thereby avoiding mutual interference of the heat flow of the two asymmetrical heat sources. Moreover, the two independent heat transfer elements 111 can improve redundancy reliability when the other heat transfer element 111 fails. When the two heat dissipation portions 113 are connected to each other, it is suitable for situations where the power difference between the two heat sources is small. When the two heat dissipation portions 113 are connected to each other, the structure is simpler, the manufacturing cost is lower, and the required space is smaller.

[0065] In this embodiment, the heat-absorbing portions 112 of the two heat transfer elements 111 are parallel to each other. The parallel arrangement makes the heat-absorbing portions 112 of the two heat transfer elements 111 more symmetrical, which is more conducive to the symmetrical installation of the two heat sources. Compared with the structure where the two heat-absorbing portions 112 are not parallel, it is more conducive to reducing the space occupied by the heat sink in the first direction. The heat-conducting surface 1121 perpendicular to the first direction can increase the effective heat dissipation area and provide heat dissipation efficiency. When there are two heat-conducting surfaces 1121, the two heat-conducting surfaces 1121 are arranged opposite each other, which can balance the heat flow distribution on both sides of the heat-absorbing portion 112 and avoid local overheating.

[0066] In the embodiment, the heat dissipation part 113 is arc-shaped, and the heat dissipation parts 113 of the two heat transfer members 111 are communicated with each other to integrally form the two heat transfer members 111 of the heat transfer assembly 11 and form a U-shaped opening structure, which is simpler in structure, lower in process cost, and smaller in required space, can extend the length of the heat dissipation part 113 under the condition that the length of the heat sink 10 along the first direction is constant, and increase the heat dissipation efficiency, when the continuous heat conduction structure is configured to realize heat transfer from the heat absorption part 112 to the heat dissipation part 113 through the medium heat transfer path in the continuous heat conduction structure, and reduce the flow resistance of the fluid in the heat transfer member 111, thereby improving the heat exchange efficiency and the heat dissipation efficiency of the heat sink 10.

[0067] In the embodiment, the heat transfer member 111 dissipates heat through fluid phase change, which is higher in heat dissipation efficiency than solid heat conduction or convection circulation, and does not require an external pump or mechanical drive, which is simple in structure; the heat sink 10 includes at least two heat transfer assemblies 11, and each heat transfer assembly 11 is arranged along a second direction perpendicular to the first direction; the heat conduction surfaces 1121 of the heat absorption parts 112 located on the same side are located on the same plane, which on the one hand can expand the heat conduction surface 1121 of the heat sink 10 according to the need by increasing the number of the heat transfer assemblies 11, and on the other hand, since the heat transfer member 111 dissipates heat through fluid phase change, the redundancy reliability when the heat transfer assembly 11 fails is improved compared with the scheme of one heat transfer assembly 11 which is longer along the second direction; in addition, the heat conduction surfaces 1121 on the same side are coplanar, which can ensure that the heat transfer assemblies 11 are uniformly contacted with the heat source (the heat generating element 22) and reduce the assembly tolerance requirement.

[0068] In the embodiment, since the heat transfer member 111 dissipates heat through fluid phase change, the heat transfer member 111 is in the form of a heat pipe, and during the processing of the heat transfer assembly 11, two contraction sections are inevitably formed at the two ends of the heat transfer assembly 11, which have a smaller contribution to heat dissipation, and in the technical solution, the length of the first contraction section 114 along the second direction is smaller than the length of the second contraction section 115 along the second direction, and the first contraction sections 114 and the second contraction sections 115 of each heat transfer assembly 11 are alternately arranged along the second direction, which is beneficial to balance the influence of the first contraction sections 114 and the second contraction sections 115 on both sides of the heat sink 10 along the first direction on the heat dissipation efficiency, and is more beneficial to the heat dissipation balance on both sides of the heat sink 10.

[0069] In this embodiment, the fixing seat 12 is made of metal material, which is beneficial for processing and casting into a structure that is attached to the inner wall of the heat transfer assembly 11, and has high structural strength. The parts of the heat transfer assembly 11 are attached to the outer wall of the fixing seat 12, which can improve the structural stability of the heat transfer component 111 and enable the heat of the heat transfer assembly 11 to be transferred to the fixing seat 12 and dissipated by the fixing seat 12. Advantageously, the heat of the heat dissipation part 113 can be transferred to the fixing seat 12, thereby improving the heat dissipation efficiency of the heat dissipation part 113 and further improving the heat dissipation efficiency of the heat transfer assembly 11. In addition, the two double heat absorption parts 112 are respectively attached to the two surfaces of the fixing seat that face away from each other in the first direction, which can balance the stress distribution on both sides of the heat transfer assembly 11 and prevent the heat transfer assembly 11 from deforming. It should be understood that when the heat transfer component 111 realizes the heat absorption and dissipation functions through fluid phase change (such as heat pipe evaporation / condensation), although the fixing seat 12 is made of metal material, due to the characteristics of the heat transfer component 111, the heat transfer component 111 transfers heat through the phase change (liquid evaporation-gas flow-condensation backflow) of the internal working medium, and the equivalent thermal conductivity can reach 10,000-100,000 W / (m·K), which is much higher than that of metal material. Therefore, the metal material fixing seat 12 has little effect on the temperature difference of the heat dissipation part 113 and the heat absorption part 112. When the heat transfer component 111 realizes the heat absorption and dissipation functions through forced driving (such as liquid cooling pump driving), the high thermal conductivity of the metal material fixing seat 12 can quickly spread the local heat to the entire heat absorption part 112, avoid the accumulation of heat near the contact point of the heat absorption part 112, and reduce the risk of local overheating. The metal material fixing seat 12 can serve as a support structure for the heat dissipation part 113 (such as a liquid cooling radiator), while assisting the transfer of heat from the heat dissipation part 113 to the external environment.

[0070] In this embodiment, the accommodation groove 121 extends in the third direction, and the heat absorption part 112 of each heat transfer assembly 11 is located in the accommodation groove 121 and the heat conduction surface 1121 is attached to the groove bottom of the accommodation groove 121. The accommodation groove 121 can play a pre-positioning role for the heat transfer assembly 11 during the process of attaching the heat transfer assembly 11 to the outer wall of the fixing seat 12. The attachment of the heat conduction surface 1121 to the groove bottom of the accommodation groove 121 can further enhance the mechanical stability and prevent the heat transfer assembly 11 from deforming due to vibration. In addition, the two groove side walls 1211 of the metal material accommodation groove 121 can be used to attach to the back surface of the heat generating element 22, further increasing the heat dissipation efficiency of the heat generating element 22.

[0071] In this embodiment, the fixing seat 12 is provided with a through channel 122 extending in the second direction, which can enable the heat of the heat dissipation part 113 to be transferred to the fixing seat 12 and then dissipated by the through channel 122 in the fixing seat 12. The heat exchange efficiency of the heat dissipation part 113 is high, which further improves the heat dissipation efficiency of the heat sink 10. In addition, the provision of the through channel 122 can also reduce the production material, reduce the production cost and reduce the weight of the fixing seat 12.

[0072] In the embodiment, the reinforcing portion 123 is arranged at the middle of the fixing base along the second direction, and the reinforcing effect on the fixing base 12 is better.

[0073] In the embodiment, the first connecting portion 1241 is integrated with the end face of the opening end of the through channel 122 and is used for connecting with the heat source (the circuit board 21), so that the reinforcing portion 123 can not only strengthen the structural stability of the fixing base 12, but also realize the connection with the heat source. The first connecting portion 1241 is integrated with the end face of the opening end of the through channel 122, so that the first connecting portion 1241 has a longer length along the first direction, and the structural strength of the first connecting portion 1241 is large.

[0074] In the embodiment, the two sides of the end of the fixing base 12 close to the heat absorbing portion 112 along the first direction are respectively provided with the second connecting portion 125 and the third connecting portion 126, and the second connecting portion 125 and the third connecting portion 126 are used for connecting with the heat source (the circuit board 21) and have different structures. The heat source is connected with the first connecting portion 1241, so that the heat source is connected with the two sides of the fixing base 12 along the third direction, the structure is more stable, and the structures of the second connecting portion 125 and the third connecting portion 126 are different, so that when two heat sources with the same structure are installed, an anti-fumble design can be formed to avoid misinstallation.

[0075] In the embodiment, the heat absorbing portion 112 penetrates the circuit board 21 and is attached to the back of the heat generating element 22, so that the heat transfer path is shortened, the thermal resistance is reduced, the heat transfer member 111 is embedded in the inside of the circuit board 21, and the occupied space of the heat sink 10 is reduced.

[0076] The embodiment also provides a DC-DC converter which comprises the heat dissipation module in the above embodiment and has the same technical advantages as the above embodiment.

[0077] Embodiment 2

[0078] Embodiment 2 has basically the same structure as that of Embodiment 1, except that Figure 7 The continuous heat conduction structure is configured to realize the heat transfer from the heat absorbing portion 112 to the heat dissipating portion 113 through the heat conduction path of the heat conduction material, the heat transfer assembly 11 is integrally formed with the fixing base 12 and is located outside the fixing base 12, and each part of the heat transfer assembly 11 is integrated with the outer wall of the through channel 122. The fixing base 12 is not provided with the accommodating groove 121, and other structures are basically the same as those of Embodiment 1.

[0079] In this embodiment, the fixing seat 12 is made of metal material. The high thermal conductivity of the metal material (such as aluminum or copper) ensures that the fixing seat 12 can quickly absorb and transfer heat, avoid local overheating, and make the fixing seat 12 serve as a support base of the heat sink 10. The fixing seat 12 provides mechanical strength to resist thermal stress deformation. The integrated forming of the fixing seat 12 and the heat transfer piece 111 eliminates the contact thermal resistance and increases the thermal conductivity cross-sectional area of the heat transfer assembly 11 and the fixing seat 12, thereby improving the heat transfer efficiency from the heat transfer piece 111 to the fixing seat 12. In addition, this also means that the two heat absorption parts 112 are respectively attached to the two surfaces of the fixing seat 12 along the first direction and away from each other, which can balance the stress distribution on both sides of the heat transfer assembly 11 and prevent the heat transfer assembly from deforming.

[0080] Embodiment 3

[0081] Embodiment 3 has the same structure as that of Embodiment 1, except that Figure 8 the continuous heat conduction structure is configured to achieve heat transfer from the heat absorption part 112 to the heat dissipation part 113 through a heat conduction path of the heat conduction material.

[0082] When the heat transfer piece 111 realizes the heat absorption and dissipation functions through solid-state heat conduction, the high thermal conductivity of the metal material fixing seat 12 can quickly diffuse the local heat to the entire heat absorption part 112, avoid the accumulation of heat near the contact point of the heat absorption part 112, and reduce the risk of local overheating. The metal material fixing seat 12 can serve as a support structure for the heat dissipation part 113 and assist in transferring heat from the heat dissipation part 113 to the external environment. When the heat transfer piece 111 dissipates heat through solid-state heat conduction, the heat transfer assembly 11 and the fixing seat 12 can be made of different materials, such as selecting the heat transfer piece 111 to be made of high thermal conductivity material and the fixing seat 12 to be made of high strength material, to further balance the heat conduction and strength.

[0083] The above description and embodiment are used to explain the protection scope of the present application, but do not constitute a limitation on the protection scope of the present application. Through the inspiration of the present application or the above embodiment, those skilled in the art can combine common knowledge, ordinary technical knowledge in the art and / or prior art to obtain modifications, equivalent replacements or other improvements of the embodiments of the present application or part of the technical features through logical analysis, reasoning or limited experiments, which should be included in the protection scope of the present application.

Claims

1. A heat sink (10) characterized by, The heat exchanger (10) comprises at least one heat transfer assembly (11), each heat transfer assembly (11) comprising two heat transfer pieces (111) made of heat conductive material and forming a continuous heat conductive structure, the continuous heat conductive structure comprising heat absorption portions (112) and heat dissipation portions (113) in communication with each other; the heat absorption portions (112) of the two heat transfer pieces (111) are arranged along a first direction, and the heat dissipation portions (113) of the two heat transfer pieces (111) are close to or in communication with each other along the first direction to concentrate heat exchange; wherein the continuous heat conductive structure is configured to realize heat transfer from the heat absorption portions (112) to the heat dissipation portions (113) through a heat conduction path of the heat conductive material and / or a medium heat transfer path in the continuous heat conductive structure. The heat absorption portions (112) of the two heat transfer pieces (111) are parallel to each other, and the heat absorption portions (112) are provided with at least one heat conductive surface (1121) perpendicular to the first direction.

2. A heat sink (10) as claimed in claim 1, characterised in that The heat dissipation portions (113) are arc-shaped, and the heat dissipation portions (113) of the two heat transfer pieces (111) are in communication with each other to make the two heat transfer pieces (111) of the heat transfer assembly (11) integrally formed and form a U-shaped opening structure.

3. A heat sink (10) as claimed in claim 2, characterised in that The heat transfer piece (111) dissipates heat through fluid phase change; the heat exchanger (10) comprises at least two heat transfer assemblies (11), and each heat transfer assembly (11) is arranged along a second direction perpendicular to the first direction; the heat conductive surfaces (1121) of the heat absorption portions (112) located on the same side are located on the same plane.

4. A heat sink (10) as claimed in claim 3, characterised in that Each heat transfer assembly (11) is provided with a first contraction section (114) and a second contraction section (115) at the end away from the heat dissipation portion (113) of the two heat absorption portions (112), respectively, the length of the first contraction section (114) along the second direction is less than the length of the second contraction section (115) along the second direction, and the first contraction section (114) and the second contraction section (115) of each heat transfer assembly (11) are alternately arranged along the second direction.

5. A heat sink (10) as claimed in claim 4, characterised in that Further comprising a fixed seat (12) made of metal material, the heat transfer piece (111) dissipates heat through heat conduction; the heat transfer assembly (11) is integrally formed with the fixed seat (12) and located on the outside of the fixed seat (12); the heat absorption portion (112) extends along a third direction perpendicular to the first direction, and the heat conductive surface (1121) is located on the side away from each other of the two heat absorption portions (112); the heat dissipation portion (113) of the heat transfer assembly (11) is at least partially located on one side of the fixed seat (12) along the third direction.

6. A heat sink (10) as claimed in claim 3, characterised in that Further comprising a fixed seat (12) made of metal material, the heat transfer piece (111) dissipates heat through heat conduction or through fluid phase change; each part of the heat transfer assembly (11) is in close contact with the outer wall of the fixed seat (12), the heat absorption portion (112) extends along a third direction perpendicular to the first direction, and the heat conductive surface (1121) is located on the side away from each other of the two heat absorption portions (112); the heat dissipation portion (113) of the heat transfer assembly (11) is at least partially located on one side of the fixed seat (12) along the third direction.

7. A heat sink (10) as claimed in claim 3, characterised in that ​ 8. A heat sink (10) as claimed in claim 7, characterised in that The fixing base (12) is provided with a receiving groove (121) extending along a third direction on both sides along a first direction, and the heat absorbing part (112) of each heat transfer assembly (11) is located in the receiving groove (121) and adheres to the groove bottom of the receiving groove (121).

9. A heat sink (10) as claimed in any one of claims 6 to 8, characterised in that, The fixing base (12) is provided with a through channel (122) extending along a second direction perpendicular to the first direction and the third direction and penetrating through; each part of the heat transfer assembly (11) adheres to or is integrated with the outer wall of the through channel (122).

10. A heat sink (10) as claimed in claim 9, characterised in that The fixing base (12) is provided with a reinforcing part (123) protruding from the inner wall of the through channel (122) at the middle part along the second direction.

11. A heat sink (10) as claimed in claim 10, characterised in that The through channel (122) is open at one end away from the heat radiating part (113) along the third direction; the reinforcing part (123) is provided with two reinforcing ribs (124) protruding from the inner wall of the through channel (122) on both sides along the first direction, each reinforcing rib (124) extends along the third direction and is provided with a first connecting part (1241) extending out of the through channel (122), and the first connecting part (1241) is integrated with the end surface of the open end of the through channel (122) and is used for connecting with the heat source.

12. A heat sink (10) as claimed in claim 11, characterised in that The fixing base (12) is provided with a second connecting part (125) and a third connecting part (126) on both sides along the first direction near one end close to the heat radiating part (113), and the second connecting part (125) and the third connecting part (126) are both used for connecting with the heat source and have different structures.

13. A heat dissipating module characterized by, The heat sink (10) of any one of claims 1-12 and two electrical components (20) are included, and the two electrical components (20) adhere to the surfaces of the two heat absorbing parts (112) away from each other.

14. A heat dissipating module as claimed in claim 13, characterized in that The electrical component (20) includes a circuit board (21) and a heating element (22) mounted on one side of the circuit board (21), and the heat absorbing part (112) penetrates the circuit board (21) and adheres to the surface of the heating element (22) close to the circuit board (21).

15. A DC-DC converter, characterized by The heat dissipation module of claim 13 or 14 is included.

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