Radiator and LiDAR

Abstract

The present disclosure relates to a heat sink, comprising: a shell; a heat conductor, one end of which extends into the shell to absorb heat from the shell, and the other end extends out of the shell to dissipate heat; a fin, which is located in the shell and transfers heat from the shell to the heat conductor; and a heat dissipation portion, which is arranged at the other end of the heat conductor extending out of the shell. The thermal resistance of the entire heat transfer process of the embodiment of the present disclosure is much smaller than the case of forced air convection in the existing solution, and efficient heat exchange between the rotating structure and the stator can be achieved.

Description

Technical Field

[0001] The present disclosure relates to the field of heat dissipation technology, and in particular to a heat sink that can be used for a laser radar and a laser radar including the heat sink. Background Art

[0002] For rotating structures, there is a heat dissipation requirement between the rotating part (or rotor part) and the fixed part (or stator part). Generally, the heat of the rotor part needs to be dissipated to the fixed part, and the fixed part and the rotor part are not in direct contact. Therefore, the heat exchange between the two can only rely on air convection. Although the convective heat transfer effect can be slightly enhanced by increasing the heat exchange area and using a fin structure, the improvement is generally limited. For devices that require a large amount of heat dissipation, reducing the thermal resistance of the fixed part and the rotor part can usually achieve a very good heat dissipation optimization effect.

[0003] Thermal resistance is defined as the ratio of the temperature difference between the two ends of an object and the power of the heat source when heat is transferred to the object. The unit is Kelvin per watt (K / W) or Celsius per watt (℃ / W), that is:

[0004]

[0005] In the above formula, T1 is the temperature of one end of the object, T2 is the temperature of the other end of the object, and P is the power of the heat source.

[0006] The existing solutions are still mainly based on increasing the heat exchange area and using fin structures.

[0007] Increasing the heat exchange area and using a fin structure can only improve the heat exchange capacity to a very limited extent, and the benefits gradually decrease as the degree of completion of the heat dissipation structure increases. Taking a rotation speed of 600rpm as an example, using a very extreme staggered fin structure (the gap between the fins is very small and the arrangement is appropriate) can only reduce the thermal resistance to 0.75℃ / W. For application scenarios with relatively high heat dissipation requirements, this thermal resistance is still relatively large.

[0008] The contents of the background technology section are merely the technologies known to the public and do not necessarily represent the existing technologies in the field.

[0009] Public Content

[0010] In view of at least one of the defects in the prior art, the present disclosure provides a heat sink, comprising: a shell; a heat conductor, one end of which extends into the shell to absorb heat from the shell, and the other end extends out of the shell to dissipate heat; a fin, which is located in the shell and transfers heat from the shell to the heat conductor; and a heat dissipation portion, which is arranged at the other end of the heat conductor extending out of the shell.

[0011] According to one aspect of the present disclosure, the shell is rotatable relative to the heat conductive member, the multiple groups of fins include a first group of fins mounted on the shell and a second group of fins mounted on the heat conductive member, and the first group of fins and the second group of fins are staggered and spaced apart.

[0012] According to one aspect of the present disclosure, heat transfer oil is filled between the heat conducting member and the housing. According to one aspect of the present disclosure.

[0013] According to one aspect of the present disclosure, the heat conducting member is a heat pipe, and the heat pipe comprises an evaporation section located inside the shell and a condensation section located outside the shell; and / or

[0014] The housing comprises an opening at the top thereof and a cover covering the opening, and the heat conducting member passes through the cover.

[0015] According to one aspect of the present disclosure, heat transfer oil is filled between the first group of fins and the second group of fins; and / or

[0016] The first group of fins and the second group of fins extend in a horizontal direction, and their projections on the bottom of the housing at least partially overlap.

[0017] According to one aspect of the present disclosure, the radiator is a radiator for a laser radar.

[0018] The present disclosure also relates to a laser radar, comprising: a radiator as described above; and a rotor, wherein the rotor is integral with or connected to a housing of the radiator.

[0019] According to one aspect of the present disclosure, the rotor has a groove for accommodating the housing of the radiator, and the radial dimension of the groove is smaller than the dimension of the housing of the radiator.

[0020] According to one aspect of the present disclosure, the housing of the radiator has a flange with a hole on it, the rotor has a threaded hole at a position corresponding to the hole, and the radiator is connected to the rotor by a screw passing through the hole in the flange and the threaded hole.

[0021] The present disclosure also relates to a method for dissipating heat from a laser radar using the heat sink as described above.

[0022] In the embodiments of the present disclosure, efficient heat dissipation can be achieved through the heat transfer path of the heat sink housing-fins-heat conducting member-heat dissipation portion.

[0023] In addition, by filling the first set of fins with heat transfer oil, efficient heat exchange between the rotating structure and the stator is achieved, reducing thermal resistance. A heat pipe is set in the center of the fin, and the heat is transferred from the lower end to the upper end, which has a high heat exchange efficiency.

[0024] In addition, in the laser radar disclosed in the present invention, the rotor of the laser radar and the shell of the radiator are an integrated structure or in close contact, so the thermal resistance between the two is small, which is conducive to heat transfer. At the same time, the heat pipe is placed vertically, and the heat pipe running in a good state has a higher thermal conductivity than all known metals, and the thermal resistance at the upper and lower ends of the heat pipe is extremely small.

[0025] In summary, the thermal resistance of the entire heat transfer process in the embodiment of the present disclosure is much smaller than that of the forced convection of air in the existing solution, and efficient heat exchange between the rotating structure and the stator can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The drawings constituting a part of the present disclosure are used to provide a further understanding of the present disclosure. The illustrative embodiments of the present disclosure and their descriptions are used to explain the present disclosure and do not constitute an improper limitation on the present disclosure. In the drawings:

[0027] Figure 1 A heat dissipation structure is shown;

[0028] Figure 2 Shows Figure 1 A three-dimensional view of the top cover in the heat dissipation structure;

[0029] Figure 3 Shows Figure 1 A three-dimensional diagram of a heat dissipation tray in a heat dissipation structure;

[0030] Figure 4 A cross-sectional view of a heat sink according to an embodiment of the present disclosure is shown;

[0031] Figure 5 shows a heat sink according to one embodiment of the present disclosure; and

[0032] Figure 6 A schematic diagram of a rotor according to a preferred embodiment of the present disclosure is shown. DETAILED DESCRIPTION

[0033] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the present disclosure. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0034] In the description of the present disclosure, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present disclosure. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present disclosure, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0035] In the description of the present disclosure, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or can communicate with each other; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present disclosure can be understood according to specific circumstances.

[0036] In the present disclosure, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply means that the first feature is lower in level than the second feature.

[0037] The disclosure below provides many different embodiments or examples to realize different structures of the present disclosure. In order to simplify the disclosure of the present disclosure, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present disclosure. In addition, the present disclosure can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplicity and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present disclosure provides various specific examples of processes and materials, but those of ordinary skill in the art can be aware of the application of other processes and / or the use of other materials.

[0038] The preferred embodiments of the present disclosure are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present disclosure, and are not used to limit the present disclosure.

[0039] The inventor knows a heat dissipation structure such as Figure 1 As shown in the heat dissipation structure 11 in FIG. 1 , for the sake of clarity, the rotor part below the laser radar is not shown. The rotor part is located below the heat dissipation structure 11. The components arranged in the rotating structure of the laser radar, such as the laser emitting device, are the main heat generating components. The heat dissipation structure 11 mainly includes a heat dissipation tray 13 and a top cover 12 covering the heat dissipation tray. Figure 2 and Figure 3 As shown, the heat dissipation tray 13 and the top cover 12 have vertical fins on the opposite surfaces, and the two sets of fins are overlapped and staggered in the vertical direction. During operation, the heat of the rotor part is transferred to the heat dissipation tray 13, and the heat dissipation tray 13 transfers the heat to the top cover 12 through the fins staggered in the vertical direction and air as a heat conduction medium, and then the heat is dissipated from the top cover 12 to the external air. Figure 2 A perspective view of the top cover 12 is shown, Figure 3 A perspective view of the heat sink tray 13 is shown.

[0040] First embodiment

[0041] Figure 4 A heat sink 20 according to an embodiment of the present disclosure is shown. Figure 4 Detailed description.

[0042] like Figure 4As shown, the heat sink 20 according to this embodiment includes a housing 21, a heat conductor 22, fins (23, 24) and a heat dissipation portion 25. The housing 21 is used, for example, to accommodate part of the internal structure of the heat sink 20. According to a preferred embodiment, when the heat sink 20 is applied to the heat dissipation of a laser radar, the housing 21 can be fixedly connected to the rotor of the laser radar (the main heat generating part or the heat gathering part), or it can form an integral part with the rotor of the laser radar, so as to assist the heat dissipation of the rotor of the laser radar. This will be described in detail later.

[0043] One end of the heat conducting member 22 (eg Figure 4 The lower end of the heat conducting member 22 extends into the housing 21 to absorb heat from the housing 21, and the other end (such as Figure 4 The upper end of the heat conducting member 22 in the housing 21 extends out of the housing 21 to dissipate heat. In order to effectively transfer heat from the housing 21 to the heat conducting member 22, a plurality of fins are arranged in the housing 21, and heat is transferred from the housing 21 to the heat conducting member 22 through the fins.

[0044] The heat dissipation part 25 is arranged at one end of the heat conducting member 22 extending outside the housing 21, so as to dissipate the heat of the heat conducting member 22 to the outside. The heat dissipation part 25 is a fixed structural member, such as a top cover of a laser radar. When the heat sink 20 is used for a laser radar, the housing 21 can be connected to the rotor of the laser radar, or form an integral part with the rotor of the laser radar.

[0045] Reference below Figure 4 The working process of the radiator 20 is described, wherein the radiator 20 is used to dissipate heat for a laser radar as an example.

[0046] The housing 21 of the radiator 20 is connected to the rotor of the laser radar or is integral with the rotor of the laser radar, for example, it rotates with the rotor. During the operation of the laser radar, a large amount of heat is generated inside the laser radar, especially on the rotor. In order to ensure the normal operation of the optoelectronic components of the laser radar, the generated heat needs to be discharged in time to avoid excessive temperature. The heat of the rotor is conducted to the housing 21 of the radiator 20. Fins 23 and 24 are arranged between the housing 21 and the heat conductor 22. By setting the fins, the area of ​​heat conduction is effectively increased, the heat conduction efficiency is improved, and the heat is quickly conducted to the heat conductor 22. One end of the heat conductor 22 is located in the housing 21 to receive the heat conducted through the fins; the other end of the heat conductor extends out of the housing 21 and is connected to the heat dissipation part 25, so that the heat is conducted to the heat dissipation part 25 for heat dissipation to the outside. Through the above process, the heat at the rotor of the laser radar is effectively dissipated to the surrounding environment. It should be noted that the material of the heat dissipation part 25 can be metal, such as aluminum alloy, for better heat dissipation.

[0047] Those skilled in the art will appreciate that, in addition to being used to dissipate heat for a laser radar, the radiator 20 of the present disclosure may also be used to provide heat dissipation for other types of devices, which are all within the scope of protection of the present disclosure.

[0048] According to a preferred embodiment of the present disclosure, in order to enhance the heat conduction effect, heat conducting oil is filled between the heat conducting member 22 and the shell 21, thereby enhancing the heat exchange between the heat conducting member 22 and the shell 21 and significantly reducing the thermal resistance between the heat conducting member 22 and the shell 21. In addition, in order to facilitate the addition of heat conducting oil, the shell 21 is provided with a refueling port at its top. Thus, when the heat conducting oil is consumed, heat conducting oil can be added through the refueling port. Those skilled in the art understand that the thermal conductivity of heat conducting oil is much greater than that of air, and by filling with heat conducting oil, the heat exchange efficiency can be greatly improved. Those skilled in the art understand that the protection scope of the present disclosure is not limited to heat conducting oil, and other heat conducting media can also be used.

[0049] The housing 21 of the heat sink 20 is connected to the rotor of the laser radar or is integral with the rotor of the laser radar, for example, it rotates together with the rotor, and the housing 21 can rotate relative to the heat conductor 22. That is, during the heat dissipation process, the housing 21 can rotate with the rotor of the laser radar, while the heat conductor 22 and the heat dissipation part 25 mounted thereon remain stationary. The multiple groups of fins, for example, include a first group of fins 24 mounted on the housing 21 and a second group of fins 23 mounted on the heat conductor 22, and the first group of fins 24 and the second group of fins 23 are staggered and arranged at intervals. Figure 4 A preferred arrangement of the first group of fins 24 and the second group of fins 23 is shown, wherein the two extend in the horizontal direction, and their projections on the bottom of the housing 21 at least partially overlap, that is, the two overlap in the horizontal direction. Optionally, heat transfer oil is filled between the first group of fins 24 and the second group of fins 23, so as to enhance the heat exchange between the heat conducting member 22 and the housing 21 and significantly reduce the thermal resistance between the heat conducting member 22 and the housing 21. It is understood by those skilled in the art that the two may also extend in the vertical direction and overlap in the vertical direction (e.g., similar to Figure 2 and Figure 3The staggered overlapping method shown in the figure is also within the scope of protection of the present disclosure. Staggered overlapping in the horizontal direction can bring some advantages. For example, the first group of fins 24 and the second group of fins 23 are staggered in the horizontal circumferential direction. When the second group of fins 23 rotates relative to the housing 21, the heat transfer medium (such as heat transfer oil) is concentrated in the circumferential direction (if the heat transfer oil is not sufficient, the heat transfer oil will be slightly lower), and the cover is set on the top, so there will be no oil leakage. If the first group of fins 24 and the second group of fins 23 are staggered in the vertical direction, when relative movement occurs, the heat transfer medium (such as heat transfer oil) may diffuse and flow out along the circumferential direction of the first group of fins 24 and the second group of fins 23, which may cause the problem of internal heat transfer oil leakage.

[0050] During operation of the radiator 20 , relative movement occurs between the first set of fins 24 and the second set of fins 23 , stirring the heat transfer oil therebetween, which greatly facilitates rapid heat transfer from the housing 21 to the heat conducting member 22 .

[0051] According to a preferred embodiment of the present disclosure, the heat conducting member 22 is a heat pipe, and the heat pipe includes an evaporation section and a condensation section, the evaporation section is located inside the shell 21, and the condensation section is located outside the shell 21. Figure 4 As shown, the heat pipe is arranged along the vertical direction, the upper end is connected to the heat dissipation part 25, and the lower end is connected to the second group of fins 23, which is used to transfer heat from the lower end to the upper end. A heat pipe is a heat transfer element with high thermal conductivity, having an evaporation section and a condensation section, the evaporation section (heating section) is at the bottom (the lower end of the heat pipe), and the condensation section (cooling section) is at the top (the upper end of the heat pipe). In a closed tube, an appropriate amount of working liquid is filled in the tube, and the lower end of the heat pipe is heated. The working liquid absorbs heat and vaporizes into steam. Under a small pressure difference, it rises to the upper end of the heat pipe, and releases heat to the outside world and condenses into liquid. Under the action of gravity, the condensate returns to the heating section along the inner wall of the heat pipe, and is heated and vaporized again, and the cycle is repeated, continuously transferring heat from one end to the other. Those skilled in the art can also conceive of using other types of heat conducting parts, using heat conducting parts made of metal with good thermal conductivity, such as heat conducting parts made of copper. It should be noted that water can be used as the working liquid of the heat conducting part 22. In a specific implementation, the interior of the heat conducting member 22 can be evacuated to a negative pressure state, which can be 19 KPa, and the vaporization temperature of the working liquid is 60°.

[0052] The first set of fins 24 is arranged on the outer side of the lower end of the heat conducting member 22 (heat pipe), preferably, it has no direct contact with other parts (such as the housing 21, the second set of fins 23, etc.), thereby expanding the heat exchange area of ​​the lower end of the heat pipe and enhancing the heat exchange effect. Of course, those skilled in the art can also conceive that the first set of fins 24 (or the second set of fins) is in contact with other parts to enhance the heat conduction effect through direct contact, which is within the scope of protection of the present disclosure.

[0053] In addition, the shell 21 includes an opening at the top thereof and a cover 26 covering the opening. The heat conducting member 22 passes through the cover 26 , with one end located inside the shell 21 and the other end located outside the shell 21 .

[0054] Figure 5 A cross-sectional view of the heat sink 20 is shown to more clearly illustrate its internal structure.

[0055] According to a preferred embodiment of the present disclosure, the heat dissipation path includes, for example: housing→first group of fins→heat transfer oil→second group of fins→lower end of heat pipe→upper end of heat pipe→heat dissipation portion.

[0056] The above is the specific structure of the heat sink 20 according to the first embodiment of the present disclosure.

[0057] Second embodiment

[0058] A second embodiment of the present disclosure relates to a laser radar, comprising the radiator 20 and a rotor as described above, wherein the rotor is integrated with or connected to a housing 21 of the radiator 20 .

[0059] It is easy for a person skilled in the art to understand that the housing 21 of the radiator 20 can be a part of the rotor of the laser radar. It will not be described here in detail. The following mainly describes how to connect the housing 21 of the radiator 20 to the rotor of the laser radar.

[0060] Figure 6 FIG. 2 shows a schematic diagram of a rotor 30 according to a preferred embodiment of the present disclosure. Figure 6 The rotor 30 shown includes a rotor body 31 , in which a rotating shaft 32 is disposed. During the operation of the laser radar, the rotor body 31 rotates around the rotating shaft 32 .

[0061] The rotor body 31 has a groove 33 for accommodating the housing 21 of the radiator 20. The shape of the groove 33 corresponds to the shape of the housing 21 of the radiator 20, and can be circular, rectangular, or other regular or irregular shapes. In order to fix the housing 21 of the radiator 20 to the rotor body 31, the radial dimension of the groove 33 (i.e. Figure 6The horizontal dimension of the heat sink 20 is smaller than the dimension of the housing 21 of the heat sink 20, so that the heat sink 20 is firmly fixed in the groove 33 of the rotor body 31 through the interference fit between the two, and rotates with the rotation of the rotor body 31. During processing and manufacturing, the diameter of the housing 21 of the heat sink 20 can be produced to be larger than the aperture of the groove 33 reserved for installing the heat sink 20 in the rotor body 31, and then the rotor body 31 is heated. Through thermal expansion and contraction, the aperture of the groove 33 increases to be sufficient to accommodate the housing 21 of the heat sink 20, and the heat sink 20 is assembled into the groove 33. After the rotor body 31 is cooled, the size of the groove 33 is reduced, so that the heat sink 20 is tightly locked in the groove 33.

[0062] In addition, preferably, when the radiator 20 is installed, the heat pipe is placed vertically along the vertical direction. This is because the heat pipe running in a good state has a higher thermal conductivity than all known metals, and the thermal resistance between the upper and lower ends of the heat pipe is extremely small.

[0063] The vertical dimension of the groove 33 does not need to be particularly limited and can be determined according to the appearance requirements of the laser radar or the requirements of heat dissipation. For example, in order to obtain a better heat dissipation effect, the vertical dimension of the groove 33 can be made substantially the same as the vertical dimension of the housing 21, so that the heat dissipation portion 25 is basically exposed to the outside for sufficient heat dissipation.

[0064] Alternatively, preferably, in order to fix the radiator 20 on the rotor 30, it is also possible to consider providing a flange (not shown) for the shell 21 of the radiator 20, forming a hole on the flange, and processing a threaded hole at a position of the rotor 30 corresponding to the hole, and using a screw or a screw to pass through the hole on the flange and the threaded hole on the rotor 30, so as to press the shell 21 of the radiator 20 onto the rotor 30.

[0065] The embodiments of the present disclosure also relate to a method for dissipating heat for a laser radar using the heat sink 20 as described above.

[0066] In the embodiments of the present disclosure, efficient heat dissipation can be achieved through the heat transfer path of the heat sink housing-fins-heat conducting member-heat dissipation portion.

[0067] In addition, by filling the first set of fins with heat transfer oil, efficient heat exchange between the rotating structure and the stator is achieved, reducing thermal resistance. A heat pipe is set in the center of the fin, and the heat is transferred from the lower end to the upper end, which has a high heat exchange efficiency.

[0068] In addition, in the laser radar disclosed in the present invention, the rotor of the laser radar and the shell of the radiator are an integrated structure or in close contact, so the thermal resistance between the two is small, which is conducive to heat transfer. At the same time, the heat pipe is placed vertically, and the heat pipe running in a good state has a higher thermal conductivity than all known metals, and the thermal resistance at the upper and lower ends of the heat pipe is extremely small.

[0069] In summary, the thermal resistance of the entire heat transfer process in the embodiment of the present disclosure is much smaller than that of the forced convection of air in the existing solution, and efficient heat exchange between the rotating structure and the stator can be achieved.

[0070] The solutions in the embodiments of the present disclosure are not only applicable to the mechanical laser radar mentioned in the above embodiments, but also to other types of laser radars, such as galvanometer scanning laser radars, rotating mirror scanning laser radars, or pure solid-state laser radars including Flash laser radars and phased array laser radars, etc. The present disclosure does not impose any restrictions on the types of applicable laser radars.

[0071] Finally, it should be noted that the above is only a preferred embodiment of the present disclosure and is not intended to limit the present disclosure. Although the present disclosure is described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. A radiator, comprising: case; a heat conducting member, one end of which extends into the shell to absorb heat from the shell, and the other end of which extends out of the shell to dissipate heat, wherein the end of the heat conducting member extending into the shell does not contact the shell; fins located in the housing and transferring heat from the housing to the heat conducting member; and A heat dissipation portion, disposed at the other end of the heat conducting member extending outside the housing; Wherein, during the heat dissipation process, the shell rotates relative to the heat conducting member. 2 . The heat sink according to claim 1 , wherein the fins include a first group of fins mounted on the housing and a second group of fins mounted on the heat conducting member, the first group of fins and the second group of fins are staggered and spaced apart. 3 . The heat sink according to claim 1 , wherein heat conducting oil is filled between the heat conducting member and the housing.

4. The heat sink according to claim 1 or 2, wherein the heat conducting member is a heat pipe, and the heat pipe comprises an evaporation section located inside the shell and a condensation section located outside the shell; and / or The housing comprises an opening at the top thereof and a cover covering the opening, and the heat conducting member passes through the cover.

5. The heat sink according to claim 2, wherein heat transfer oil is filled between the first group of fins and the second group of fins; and / or The first group of fins and the second group of fins extend in a horizontal direction, and their projections on the bottom of the housing at least partially overlap. 6 . The heat sink of claim 2 , wherein the first group of fins and the second group of fins extend in a vertical direction and are staggered in the vertical direction.

7. A laser radar, comprising: The radiator according to any one of claims 1 to 6; and The rotor is integrated with or connected to the shell of the radiator.

8. The laser radar as claimed in claim 7, wherein the rotor has a groove for accommodating the shell of the radiator, and the radial dimension of the groove is smaller than the dimension of the shell of the radiator.

9. The laser radar as described in claim 7, wherein the shell of the radiator has a flange, the flange has a hole, the rotor has a threaded hole at a position corresponding to the hole, and the radiator is connected to the rotor by a screw passing through the hole in the flange and the threaded hole.

10. A method for dissipating heat from a laser radar using the radiator as described in any one of claims 1 to 6.

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