CN210982726U

CN210982726U - Radiator and laser radar

Info

Publication number: CN210982726U
Application number: CN201921322299.7U
Authority: CN
Inventors: 张超; 向少卿
Original assignee: Hesai Photonics Technology Co Ltd
Current assignee: Hesai Photonics Technology Co Ltd
Priority date: 2019-08-13
Filing date: 2019-08-13
Publication date: 2020-07-10
Anticipated expiration: 2029-08-13

Abstract

The present disclosure relates to a heat sink and a laser radar, including: a housing; a heat conductive member having one end extended into the case to absorb heat from the case and the other end extended out of the case to radiate heat; fins located in the housing and transferring heat from the housing to the heat conductive member; and a heat dissipating portion provided at the other end of the heat conductive member that protrudes outside the housing. The thermal resistance of the whole heat transfer process of the embodiment of the disclosure is far smaller than the condition of forced convection of air in the existing scheme, and high-efficiency heat exchange between the rotating structure and the stator can be realized.

Description

Radiator and laser radar

Technical Field

The present disclosure relates to the field of heat dissipation technologies, and in particular, to a heat sink for a laser radar and a laser radar including the heat sink.

Background

For a rotating structure, there is a heat dissipation requirement between a rotating part (or a rotor part) and a fixed part (or a stator part), and generally, heat of the rotor part needs to be dissipated to the fixed part, and the fixed part and the rotor part do not directly contact with each other, so that heat exchange between the rotating part and the fixed part can only depend on air convection at present, although the heat exchange area can also be increased and the heat convection effect can be enhanced in a small amplitude by using a fin structure, the improvement is limited in general, and for a device requiring large heat dissipation, a very good heat dissipation optimization effect can be achieved by reducing the thermal resistance of the fixed part and the rotor part.

The thermal resistance (thermal resistance) is defined as: when heat is transferred across the object, the ratio between the temperature difference across the object and the power of the heat source, in kelvin per watt (K/W) or degrees celsius per watt (c/W), is:

in the above formula, T₁Is the temperature, T, of one end of an object₂Is the temperature at the other end of the object and P is the power of the heat generating source.

The existing solutions still mainly increase the heat exchange area and use the fin structure.

The improvement of the heat exchange capacity by increasing the heat exchange area and using the fin structure is very limited, the benefit is gradually reduced along with the improvement of the completion degree of the heat dissipation structure, for example, the rotation speed is 600rpm, the heat resistance can only be reduced to 0.75 ℃/W by using the extremely staggered fin structure (the gaps of the fins are very small and the fins are properly arranged), and the heat resistance is still larger for the application scene with higher heat dissipation requirements.

The statements in this background section merely represent techniques known to the public and are not, of course, representative of the prior art.

SUMMERY OF THE UTILITY MODEL

In view of at least one of the drawbacks of the prior art, the present disclosure proposes a heat sink comprising: a housing; a heat conductive member having one end extended into the case to absorb heat from the case and the other end extended out of the case to radiate heat; fins located in the housing and transferring heat from the housing to the heat conductive member; and a heat dissipating portion provided at the other end of the heat conductive member that protrudes outside the housing.

According to one aspect of the disclosure, the housing is rotatable relative to the heat transfer member, and the plurality of sets of fins include a first set of fins mounted on the housing and a second set of fins mounted on the heat transfer member, the first and second sets of fins being staggered and spaced apart.

According to one aspect of the present disclosure, heat conductive oil is filled between the heat conductive member and the case. According to one aspect of the present disclosure.

According to one aspect of the present disclosure, the heat conducting member is a heat pipe including an evaporation section located inside the housing and a condensation section located outside the housing; and/or

The case includes an opening at a top thereof and a cover covering the opening, and the heat conductive member passes through the cover.

According to one aspect of the present disclosure, a heat conducting oil is filled between the first group of fins and the second group of fins; and/or

The first and second sets of fins extend in a horizontal direction, with projections on the bottom of the housing at least partially overlapping.

According to one aspect of the disclosure, wherein the heat sink is a heat sink for a lidar.

The present disclosure also relates to a lidar comprising: the heat sink as described above; and a rotor integrated with or coupled to the housing of the heat sink.

According to one aspect of the present disclosure, the rotor has a groove thereon for accommodating the housing of the heat sink, the groove having a radial dimension smaller than that of the housing of the heat sink.

According to an aspect of the present disclosure, wherein the housing of the heat sink has a flange having a hole thereon, the rotor has a screw hole at a position corresponding to the hole, and the heat sink is connected to the rotor by a screw passing through the hole of the flange and the screw hole.

The present disclosure also relates to a method of dissipating heat from a lidar using a heat sink as described above.

In the embodiment of the disclosure, efficient heat dissipation can be performed through the heat transfer path of the heat sink housing, the fins, the heat conducting member and the heat dissipating part.

In addition, through the combination of filling heat conduction oil between the first group of fins and the second group of fins, the efficient heat exchange between the rotating structure and the stator is realized, and the thermal resistance is reduced. The heat pipe is arranged in the center of the fin, the heat pipe is used for conducting heat from the lower end to the upper end, and the heat exchange efficiency is high.

In addition, in the laser radar of the disclosure, the rotor of the laser radar and the shell of the radiator are of an integral structure or are in close contact, so that the heat conduction and the heat resistance between the rotor of the laser radar and the shell of the radiator are small, and the heat conduction and the heat resistance are beneficial to heat transfer. Meanwhile, the heat pipe is vertically arranged, so that the heat pipe running in a good state has higher heat conductivity than all known metals, and the heat resistance of the upper end and the lower end of the heat pipe is extremely small.

In summary, the thermal resistance in the whole heat transfer process of the embodiment of the disclosure is much smaller than the situation of forced convection of air in the existing scheme, and efficient heat exchange between the rotating structure and the stator can be realized.

Drawings

The accompanying drawings, which are included to provide a further understanding of the disclosure, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure and are not to limit the disclosure. In the drawings:

FIG. 1 illustrates a heat dissipation structure;

FIG. 2 illustrates a perspective view of a top cover in the heat dissipation structure of FIG. 1;

FIG. 3 illustrates a perspective view of a heat sink tray in the heat sink structure of FIG. 1;

FIG. 4 illustrates a cross-sectional view of a heat sink according to one embodiment of the present disclosure;

FIG. 5 illustrates a heat sink according to one embodiment of the present disclosure; and

FIG. 6 shows a schematic view of a rotor according to a preferred embodiment of the present disclosure.

Detailed Description

In the following, only certain exemplary embodiments are briefly described. As those skilled in the art can appreciate, the described embodiments can be modified in various different ways, without departing from the spirit or scope of the present disclosure. Accordingly, the drawings and description are to be regarded as illustrative in nature, and not as restrictive.

In the description of the present disclosure, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "straight", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and therefore should not be considered as limiting the present disclosure. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present disclosure, "a plurality" means two or more unless specifically limited otherwise.

Throughout the description of the present disclosure, it is to be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection, either mechanically, electrically, or otherwise in communication with one another; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present disclosure can be understood by those of ordinary skill in the art as appropriate.

In the present disclosure, unless expressly stated or limited otherwise, the first feature is "on" or "under" the second feature, and may comprise the first and second features being in direct contact, or the first and second features being not in direct contact but being in contact with each other by means of another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly above and obliquely above the second feature, or simply meaning that the first feature is at a lesser level than the second feature.

The following disclosure provides many different embodiments or examples for implementing different features of the disclosure. To simplify the disclosure of the present disclosure, specific example components and arrangements are described below. Of course, they are merely examples and are not intended to limit the present disclosure. Moreover, the present disclosure may repeat reference numerals and/or reference letters in the various examples, which have been repeated for purposes of simplicity and clarity and do not in themselves dictate a relationship between the various embodiments and/or arrangements discussed. In addition, the present disclosure provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize applications of other processes and/or use of other materials.

The preferred embodiments of the present disclosure will be described below with reference to the accompanying drawings, and it should be understood that the preferred embodiments described herein are merely for purposes of illustrating and explaining the present disclosure and are not intended to limit the present disclosure.

One heat dissipation structure known to the inventors is shown as heat dissipation structure 11 in fig. 1, where for clarity the rotor part below the lidar is not shown. The rotor part is located below the heat sink structure 11, and the components arranged in the rotating structure of the lidar, 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 above the heat dissipation tray. As shown in fig. 2 and 3, the heat dissipation tray 13 and the top cover 12 each have vertically oriented fins on opposite surfaces, and the two sets of fins are stacked and staggered with respect to each other in the vertical direction. In the working process, the heat of the rotor part is transmitted to the heat dissipation tray 13, the fins arranged in the vertical direction in a staggered mode and the air are used as heat conducting media, the heat dissipation tray 13 transmits the heat to the top cover 12, and then the heat is dissipated to the outside air from the top cover 12. Fig. 2 shows a perspective view of the top cover 12, and fig. 3 shows a perspective view of the heat dissipation tray 13.

First embodiment

Fig. 4 illustrates a heat sink 20 according to one embodiment of the present disclosure. As described in detail below with reference to fig. 4.

As shown in fig. 4, the heat sink 20 according to the present embodiment includes a case 21, a heat conductive member 22, fins (23, 24), and a heat dissipation portion 25. The housing 21 serves, 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 heat dissipation of the lidar, the housing 21 may be fixedly attached to the rotor (the main heat generating portion or the collecting portion) of the lidar or may be formed as an integral part with the rotor of the lidar, so that heat dissipation of the rotor of the lidar may be assisted. As will be described in detail later.

One end (e.g., the lower end of the heat-conducting member 22 in fig. 4) of the heat-conducting member 22 extends into the housing 21 to absorb heat from the housing 21, and the other end (e.g., the upper end of the heat-conducting member 22 in fig. 4) extends out of the housing 21 to radiate heat. In order to efficiently transfer heat from the housing 21 to the heat conductive member 22, a plurality of sets of fins are provided in the housing 21, through which heat is transferred from the housing 21 to the heat conductive member 22.

A heat dissipating portion 25 is provided at an end of the heat conductive member 22 that protrudes outside the housing 21, thereby dissipating heat of the heat conductive member 22 to the outside. The heat sink 25 is a fixed structural member, such as a roof of a lidar. When the heat sink 20 is used in a lidar, the housing 21 may be connected to or an integral part of the rotor of the lidar.

The operation of the heat sink 20 will be described with reference to fig. 4, in which the heat sink 20 is used for heat dissipation of the laser radar.

The housing 21 of the heat sink 20 is connected to or integral with the rotor of the lidar, e.g. rotates with the rotor. During operation of the lidar, a large amount of heat is generated inside the lidar, particularly on the rotor. In order to ensure that photoelectric components of the laser radar work normally, the generated heat needs to be discharged in time, and the over-high temperature is avoided. The heat of the rotor is conducted to the housing 21 of the heat sink 20. The

fins

23 and 24 are arranged between the shell 21 and the heat conducting piece 22, and through the arrangement of the fins, the heat conducting area is effectively increased, and the heat conducting efficiency is improved, so that heat is quickly conducted to the heat conducting piece 22. The heat-conducting member 22 is positioned in the case 21 at one end, and receives heat conducted through the fins; the other end of the heat-conductive member protrudes outside the housing 21 and is connected to the heat-dissipating portion 25, thereby conducting heat to the heat-dissipating portion 25 for dissipating heat to the outside. Through the above process, the heat at the rotor of the laser radar is effectively dissipated into the surrounding environment. It should be noted that the material of the heat dissipation portion 25 may be metal, such as aluminum alloy, so as to better dissipate heat.

It will be appreciated by those skilled in the art that the heat sink 20 of the present disclosure may be used to provide heat dissipation for other types of devices in addition to heat dissipation for lidar, and is within the scope of the present disclosure.

According to a preferred embodiment of the present disclosure, in order to enhance the heat conduction effect, heat conduction oil is filled between the heat conduction member 22 and the housing 21, so that heat exchange between the heat conduction member 22 and the housing 21 is enhanced, and the thermal resistance between the heat conduction member 22 and the housing 21 is significantly reduced. In addition, in order to facilitate the addition of the conduction oil, the case 21 is provided at the top thereof with an oil filling port. Therefore, after the heat conduction oil is consumed, the heat conduction oil can be added through the oil filling port. Those skilled in the art understand that the thermal conductivity of the thermal oil is much greater than that of air, and the heat exchange efficiency can be greatly improved by filling the thermal oil. Those skilled in the art will appreciate that the scope of the present disclosure is not limited to thermal oils and that other thermal transfer media may be used.

The housing 21 of the heat sink 20 is connected to or integral with the rotor of the lidar, e.g. rotates with the rotor, and the housing 21 is rotatable relative to the thermally conductive member 22. That is, during heat dissipation, the housing 21 may rotate with the rotor of the lidar while the heat conductive member 22 and the heat dissipation portion 25 mounted thereon remain stationary. The plurality of sets of fins include, for example, a first set of fins 24 mounted on the housing 21 and a second set of fins 23 mounted on the heat-conducting member 22, and the first set of fins 24 and the second set of fins 23 are arranged alternately and at intervals. Fig. 4 shows a preferred arrangement of the first set of fins 24 and the second set of fins 23, wherein both extend in a horizontal direction, and the projections onto the bottom of the housing 21 at least partially overlap, i.e. overlap alternately in the horizontal direction. Optionally, heat conducting oil is filled between the first set of fins 24 and the second set of fins 23, so that heat exchange between the heat conducting member 22 and the housing 21 is enhanced, and thermal resistance between the heat conducting member 22 and the housing 21 is significantly reduced. It is understood by those skilled in the art that the two may also be made to extend in a vertical direction with staggered overlap in the vertical direction (e.g., similar to the staggered overlap shown in fig. 2 and 3), and this is within the scope of the present disclosure. The staggered overlap in the horizontal direction may provide some advantages, for example, the first set of fins 24 and the second set of fins 23 are staggered in the horizontal circumferential direction, the heat transfer medium (e.g., 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) when the second set of fins 23 rotate relative to the housing 21, and the cover is disposed on the top, so that the problem of oil leakage does not occur. If the first group of fins 24 and the second group of fins 23 are staggered in the vertical direction, the heat transfer medium (e.g., 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 when the relative movement is generated, which may cause a problem of internal heat transfer oil leakage.

During the operation of the heat sink 20, the relative movement between the first set of fins 24 and the second set of fins 23 agitates the heat transfer oil therebetween, thereby greatly facilitating the rapid transfer of heat from the housing 21 to the heat transfer member 22.

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 housing 21, and the condensation section is located outside the housing 21. As shown in fig. 4, the heat pipe is arranged in a vertical direction, and the upper end is connected to the heat dissipation part 25 and the lower end is connected to the second group of fins 23 for transferring heat from the lower end to the upper end. The heat pipe is a heat transfer element with high heat conductivity, and is provided with an evaporation section and a condensation section, wherein the evaporation section (a heating section) is arranged at the lower part (the lower end of the heat pipe), the condensation section (a cooling section) is arranged at the upper part (the upper end of the heat pipe), a proper amount of working liquid is filled in the closed pipe, the lower end of the heat pipe is heated, the working liquid absorbs heat and is vaporized into steam, the steam rises to the upper end of the heat pipe under a small pressure difference, and the heat is released to the outside and is condensed into liquid. The condensate returns to the heated section along the inner wall of the heat pipe under the action of gravity, is heated and vaporized again, and is circulated in such a way, so that heat is continuously transmitted from one end to the other end. One skilled in the art can also contemplate the use of other types of thermally conductive members, using thermally conductive members made of a metal with good thermal conductivity, such as copper. Note that water may be used as the working fluid of the heat conductive member 22. In one embodiment, the heat-conducting member 22 may be evacuated to a negative pressure of 19KPa, and the vaporization temperature of the working fluid is 60 °.

The first set of fins 24 are disposed outside the lower end of the heat conducting member 22 (heat pipe), preferably without direct contact with other parts (such as the housing 21, the second set of fins 23, etc.), so as to enlarge the heat exchange area at the lower end of the heat pipe and enhance the heat exchange effect. Of course, it is contemplated by those skilled in the art that the first set of fins 24 (or the second set of fins) may be in contact with other portions to enhance the heat transfer effect through direct contact, and such is within the scope of the present disclosure.

In addition, the case 21 includes an opening at the top thereof and a cover 26 covering the opening, and the heat conductive member 22 passes through the cover 26 with one end positioned inside the case 21 and the other end positioned outside the case 21.

Fig. 5 shows a cross-sectional view of the heat sink 20, more clearly showing the structure within.

According to a preferred embodiment of the present disclosure, the heat dissipation path includes, for example: the shell → the first group of fins → heat conducting oil → the second group of fins → the lower end of the heat pipe → the upper end of the heat pipe → the heat dissipation part.

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

Second embodiment

A second embodiment of the present disclosure relates to a lidar comprising a heat sink 20 as described above and a rotor, wherein the rotor is integral with or connected to the housing 21 of the heat sink 20.

It will be readily understood by those skilled in the art that the housing 21 of the heat sink 20 may be part of the rotor of the lidar. And will not be described in detail herein. The following mainly describes how the housing 21 of the heat sink 20 is connected to the rotor of the lidar.

Fig. 6 shows a schematic view of a rotor 30 according to a preferred embodiment of the present disclosure. As shown in fig. 6, the rotor 30 includes a rotor body 31, and a rotating shaft 32 is disposed in the rotor body 31, and during the operation of the laser radar, the rotor body 31 rotates around the rotating shaft 32.

The rotor body 31 has a recess 33 therein for receiving the housing 21 of the heat sink 20. The shape of the recess 33 corresponds to the shape of the housing 21 of the heat sink 20, and may be circular, rectangular or rectangular, or may have other regular or irregular shapes. In order to fix the housing 21 of the heat sink 20 to the rotor body 31, the radial dimension (i.e., the dimension in the horizontal direction in fig. 6) of the groove 33 may be made 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 by the interference fit therebetween and rotates with the rotation of the rotor body 31. In manufacturing, the diameter of the casing 21 of the heat sink 20 can be made larger than the diameter of the groove 33 of the rotor body 31 for installing the heat sink 20, and then the rotor body 31 is heated, and the diameter of the groove 33 is increased by expansion and contraction, and the casing 21 of the heat sink 20 is accommodated, and then the heat sink 20 is assembled in the groove 33. After the rotor body 31 is cooled, the size of the groove 33 is reduced, thereby tightly locking the heat sink 20 in the groove 33.

It is also preferable that the heat sink 20 is installed such that the heat pipe is vertically placed in the vertical direction. This is due to the fact that a heat pipe operating in good condition has a higher thermal conductivity than all known metals, and the heat resistance at the upper and lower ends of the heat pipe is extremely small.

The vertical dimension of the groove 33 is not particularly limited, and may be determined according to the requirements of the laser radar in appearance or heat dissipation. For example, in order to obtain a good heat dissipation effect, the vertical dimension of the groove 33 may be made substantially the same as the vertical dimension of the housing 21 so that the heat dissipation portion 25 is substantially exposed to perform sufficient heat dissipation.

Alternatively, preferably, in order to fix the heat sink 20 to the rotor 30, it is also conceivable to provide a flange (not shown) for the housing 21 of the heat sink 20, form a hole in the flange, simultaneously machine a screw hole in the rotor 30 at a position corresponding to the hole, and press the housing 21 of the heat sink 20 to the rotor 30 by a screw or a screw through the hole in the flange and the screw hole in the rotor 30.

Embodiments of the present disclosure also relate to a method of dissipating heat from a lidar using the heat sink 20 as described above.

The solution in the embodiment of the present disclosure is not only applicable to the mechanical lidar mentioned in the above embodiment, but also applicable to other types of lidar, such as a galvanometer scanning lidar, a rotating mirror scanning lidar, or a pure solid state lidar including a Flash lidar, a phased array lidar, and the like.

Finally, it should be noted that: although the present disclosure has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the disclosure. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present disclosure should be included in the protection scope of the present disclosure.

Claims

1. A heat sink, comprising:

a housing;

a heat conductive member having one end extended into the case to absorb heat from the case and the other end extended out of the case to radiate heat;

fins located in the housing and transferring heat from the housing to the heat conductive member; and

a heat dissipating part disposed at the other end of the heat conductive member extending out of the housing.

2. The heat sink of claim 1, wherein the housing is rotatable relative to the heat transfer member, the fins comprising a first set of fins mounted on the housing and a second set of fins mounted on the heat transfer member, the first and second sets of fins being staggered and spaced apart.

3. The heat sink according to claim 1 or 2, wherein heat conductive oil is filled between the heat conductive member and the case.

4. The heat sink of claim 1 or 2, wherein the heat conducting member is a heat pipe comprising an evaporation section located inside the housing and a condensation section located outside the housing; and/or

5. The heat sink according to claim 2, wherein a thermal oil is filled between the first group of fins and the second group of fins; and/or

The first set of fins and the second set of fins extend in a horizontal direction and have projections on the bottom of the housing that at least partially overlap.

6. The heat sink of claim 2, wherein the first and second sets of fins extend in a vertical direction and are staggered in the vertical direction.

7. The radiator of claim 3 wherein said housing includes a filler opening at a top portion thereof.

8. A lidar, comprising:

the heat sink of any one of claims 1-7; and

a rotor integral with or coupled to the housing of the heat sink.

9. The lidar of claim 8, wherein the rotor has a recess therein for receiving the housing of the heat sink, the recess having a radial dimension less than a dimension of the housing of the heat sink.

10. The lidar of claim 8, wherein the housing of the heat sink has a flange with a hole therein, the rotor has a threaded hole at a location corresponding to the hole, and the heat sink is coupled to the rotor by a screw passing through the hole of the flange and the threaded hole.