LIQUID-CURTAIN TYPE HEAT DISSIPATION STRUCTURE FOR LIDAR ONBOARD UNMANNED AERIAL VEHICLE

Abstract

A liquid-curtain type heat dissipation structure for LiDAR onboard unmanned aerial vehicle, belonging to the field of LiDARs. The structure is used to solve the problem that the existing device onboard UAV is difficult to meet heat dissipation requirements of LiDAR onboard UAV due to limited energy source during operation. The structure is provided on a LiDAR box body, a liquid storage tank is built into the top of a box lid to store cooling liquid. Meanwhile, the liquid storage tank is provided with a vent hole and a liquid outlet, and the vent hole is used to control flow velocity of the cooling liquid. During operation, the cooling liquid flows out from the liquid outlet, is guided to a heat dissipation panel through a liquid guide groove, and is attached to a surface of a heat dissipation panel.

Claims

1. A liquid-curtain type heat dissipation structure for LiDAR onboard unmanned aerial vehicle, wherein a cooling liquid-curtain is formed in a heat dissipation interface such that heat dissipation is achieved by phase change of the cooling liquid in an operation environment; the structure comprises a micro liquid storage tank and a heat dissipation panel; a liquid inlet, a liquid outlet, and a vent hole are provided on the micro liquid storage tank, and a heat dissipation interface and a drainage channel are provided on the heat dissipation panel.

2. The liquid-curtain type heat dissipation structure for LiDAR onboard unmanned aerial vehicle according to claim 1, wherein the micro liquid storage tank which is configured to store the cooling liquid required is integrally formed on a box lid or is externally disposed, and a volume V in the tank satisfies Formula (1) to ensure working time, $\begin{array}{cc}Va{T}^{1.62}{P}^{-0.5}{H}^{-1.1}\mathrm{tS}& \left(1\right)\end{array}$ wherein a is an environment influence coefficient, T is a temperature ( C.), P is an atmospheric pressure (Pa), H is ambient humidity (%), t is working time (h), and S is an area of a heat dissipation panel (cm.sup.2).

3. The liquid-curtain type heat dissipation structure for LiDAR onboard unmanned aerial vehicle according to claim 1, wherein a caliber of the vent hole of the liquid storage tank is less than or equal to of a total caliber of the liquid outlet, so as to adjust a liquid output amount; a diameter of a single liquid outlet is smaller than 1 mm, thus preventing a large amount of air from entering a box through the liquid outlet to reduce an adjustment effect of the vent hole; and a plurality of small-caliber liquid outlets are set to meet a flow demand.

4. The liquid-curtain type heat dissipation structure for LiDAR onboard unmanned aerial vehicle according to claim 1, wherein the heat dissipation panel is integrally formed on the box lid to ensure waterproof performance of a box body; a heat dissipation interface is provided on the heat dissipation panel, and a top of the heat dissipation interface is connected to the liquid outlet, and the heat dissipation interface is arranged in rows on the heat dissipation panel; meanwhile, drainage channels are provided at the liquid outlet and all layers of the heat dissipation interface, and a contact angle between a surface material/paint of the heat dissipation interface and the cooling liquid satisfies Formula (2) to ensure that the cooling liquid is attached to the heat dissipation interface and does not slide down; $\begin{array}{cc}90& \left(2\right)\end{array}$ $\mathrm{where}$ $={\cos }^{-1}\left\{0.55\ln {}_s-1.1\ln {}_l-0.5{\mathrm{Ra}}^2\right\}$ .sub.s is solid surface energy (mN/m), .sub.l is liquid surface energy (mN/m), and Ra is surface roughness of the heat dissipation panel.

5. The liquid-curtain type heat dissipation structure for LiDAR onboard unmanned aerial vehicle according to claim 1, wherein a surface with large roughness or an absorbent coating is processed in the heat dissipation panel, the surface with large roughness or the absorbent coating is in cooperate with the drainage channels to ensure a maximum heat dissipation area of the cooling liquid; an inward fillet is provided at a lower end of the heat dissipation panel to avoid that under special circumstances, the cooling liquid enters the box and damages the device.

6. The liquid-curtain type heat dissipation structure for LiDAR onboard unmanned aerial vehicle according to claim 1, wherein a LIDAR component in the box is fixed to a box seat; in order to ensure efficient heat dissipation, a laser and a high-speed data storage device and other devices with serious power consumption and heat generation are configured to attach to an inner side of the heat dissipation panel, and a heat conducting material is disposed between the laser as well as the high-speed data storage device and the box lid as a propagation medium.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0032] FIG. 1 is a schematic diagram of a liquid-curtain type heat dissipation structure for LiDAR onboard UAV according to the present disclosure;

[0033] FIG. 2 is a side sectional view of a box lid of a liquid-curtain type heat dissipation structure for lidar onboard UAV according to the present disclosure.

[0034] In the drawings: 1rubber plug; 2box lid; 21water inlet; 22vent hole; 23liquid outlet; 24heat dissipation panel; 241heat dissipation interface; 242drainage channel; 25liquid storage tank; 4box seat.

DETAILED DESCRIPTION OF THE EMBODIMENTS

[0035] In order to make the invention goal, technical solutions and advantages of the present disclosure more clearly, the preferred embodiments are listed below, and the specific embodiments of the present disclosure will be further described in detail with the accompanying drawings.

EMBODIMENT

[0036] In conjunction with FIG. 1 and FIG. 2:

[0037] Before the LiDAR onboard UVA operates, a liquid outlet 13 is opened, and cooling liquid in the liquid storage tank 26 flows into drainage channels 242 under the action of gravity and atmospheric pressure. The drainage channels 242 are provided at the upper and lower ends of the heat dissipation interface in pairs, and alternately become upper and lower ends according to their relative positions. The upper end guides the cooling liquid to flow, so that the cooling liquid can be distributed all over the heat dissipation interface. In addition to guiding the cooling liquid, the lower end may also cooperate with an inclined angle of a groove wall at the lower end of the heat dissipation interface or a baffle to collect excessive cooling liquid at the heat dissipation interface. A contact angle between the surface material/coating on the heat dissipation interface and the cooling liquid should satisfy Formula (2) to ensure that the cooling liquid is attached to the heat dissipation interface and does not slide down.

[0038] When the LiDAR onboard UVA operates, the high-speed data acquisition and storage device and the laser can generate a lot of heat to increase its temperature and transfer heat with other surrounding substances. On one hand, the high-speed data acquisition and storage device and the laser conduct heat transfer with the heat dissipation panel through a heat conductive gel, and conduct the heat to the heat dissipation panel. Evaporation phase change of the cooling liquid in the drainage channel on the heat dissipation panel is accelerated under the action of the airflow generated by the operation of the UAV and the temperature rise of the heat dissipation panel, which can take away a large amount of heat and reduce the temperature of the heat dissipation panel, thus achieving the purpose of heat dissipation. On the other hand, the high-speed data acquisition and storage device and the laser conduct heat transfer with the air in the box body, which makes the air temperature rise. The hot air, due to small density, rises to make contact with the box lid, thus conducting heat transfer with the box lid. The specific heat capacity of the cooling liquid stored in the liquid storage tank in the box lid is much larger than that of the material of the box body itself, and the heat storage performance of the box body is enhanced, that is, the heat dissipation performance of the box body itself is enhanced, which can reduce an internal temperature of the box body to some extent. On one hand, the cooling liquid at the bottom of the liquid storage tank absorbs some heat and the temperature rises, which is conducive to accelerating the phase change process and increasing the utilization rate of the cooling liquid. On the other hand, the temperature rise of the cooling liquid and the heat dissipation panel leads to the reduction of the surface energy of the heat dissipation panel, which is beneficial to the attachment of the cooling liquid at the heat dissipation interface.

[0039] Although the embodiments of the present disclosure have been disclosed as above, they are not limited merely to those set forth in the description and the embodiments, and may be applied to various fields suitable for the present disclosure. For those skilled in the art, other modifications may be easily achieved, and the present disclosure is not limited to the specific details and illustrations shown and described herein without departing from the general concept defined by the claims and their equivalents.