Dual-cone turbo independent heat dissipation air duct and individual portable radar overall structure

Abstract

The present application relates to a kind of double conical booster independent heat dissipation air duct and individual portable radar overall structure, double conical booster independent heat dissipation air duct is composed of box and air duct cold plate, with outside communication, each sub-system is sealed in transceiver box, not directly contact air duct, utilize conduction and forced convection air cooling mode, the heat dissipation fin at high-power device is designed into high-low decrease to form symmetrical conical passage, increase the air pressure at air inlet, reasonably distribute cooling flow, outlet is discharged using fan, solve the heat dissipation sealing problem of high-power device in transceiver box. Since heat dissipation air duct itself has lower thermal inertia, the change of ambient temperature can be transmitted to the inside of the cabinet after larger damping, relatively, the environmental alternating stress suffered by each sub-system of individual portable radar is also weak, and the stress influence brought by temperature cycle of damp heat test is reduced to minimum.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of machinery and circuit, and relates to a double-tapered pressurized independent heat dissipation air duct and a single-soldier portable radar overall structure. BACKGROUND

[0002] Unlike traditional single-soldier radars, the new single-soldier portable radar needs to adapt to various air-drop and air-landing forms, and is carried by a single soldier after air-landing to perform ground and low-altitude target detection and monitoring tasks.

[0003] According to the use requirement scene, the impact resistance is a prerequisite for the single-soldier portable radar to adapt to various air-drop and air-landing environments. Under the condition that the weight is not restricted, the impact resistance of the radar can be realized by increasing the structural weight of the equipment. However, in order to facilitate carrying, moving, erecting and withdrawing, the basic requirements of the single-soldier portable radar are light weight, small size and simple connection and control. Therefore, the overall layout and structural design also need to focus on structural weight reduction and integrated design to realize the requirements of light weight and small size.

[0004] In addition, since the three-proof design requires the electronic equipment of the radar to work in a sealed environment, the internal volume of the box is small and the space is tight, which is easy to cause large electromagnetic interference. In addition, the single-soldier portable radar has a high working frequency band and a high module integration, which leads to low efficiency of the transceiver assembly. 80% of the input power is converted into heat. If such high heat cannot be effectively dissipated in time, it will greatly affect the working performance of the radar. Therefore, effective thermal control design and electromagnetic sealing design are also essential to ensure that the single-soldier portable radar works efficiently and reliably.

[0005] In summary, how to make the radar still work normally in a high heat flux density and strong impact environment under the condition of limited size and weight is a difficult problem to be solved in the structural design of the new single-soldier portable radar. SUMMARY

[0006] Technical problems to be solved

[0007] In order to avoid the shortcomings of the prior art, the present application provides a double-tapered pressurized independent heat dissipation air duct and a single-soldier portable radar overall structure.

[0008] Technical scheme

[0009] A double-cone-shaped booster independent heat dissipation air duct is characterized by an independent hollow cavity formed by an air duct heat conduction plate and an air duct cold plate, wherein the air duct heat conduction plate is provided with upper and lower heat dissipation fins, the upper heat dissipation fins are located at the heat source positions of a transceiver assembly and a wave control / power supply unit, the lower heat dissipation fins are located at the heat source positions of a microwave unit, the upper heat dissipation fins are designed to be tapered in a decreasing manner to form a symmetrically tapered cross-section heat dissipation fin array assembly, and the upper heat dissipation fins have a funnel-shaped boosting effect, the lower heat dissipation fins are designed to be irregularly tapered in the length direction, the air duct cold plate comprises a sealing plate and a digital processing cold plate, the sealing plate is provided with a groove for mounting the digital processing cold plate, a positioning and orienting equipment control plate, a filter and a digital processing subsystem are mounted on one side of the digital processing cold plate, the other side of the digital processing cold plate is provided with heat dissipation fins, the digital processing cold plate heat dissipation fins are located at the same height as the lower heat dissipation fins, and the air duct is provided with air inlets on the left and right sides of the box body, and air is taken in through the upper heat dissipation fins and the lower heat dissipation fins and discharged from four air outlets located at the lower part of the lower heat dissipation fins.

[0010] Further technical solutions of the present application: the air duct heat conduction plate is designed to be laminated and thin-walled, the air duct heat conduction surface is folded horizontally multiple times according to the thickness and size of each module, the "paper folding bearing" principle is used to increase the rigidity of the contact surface, and the inconsistency in installation caused by the different heights of the modules can be compensated.

[0011] Further technical solutions of the present application: the air duct cold plate is formed by a process of combining carbon fibers, copper mesh and aluminum alloy, so that it meets the high heat density heat dissipation requirements, has good rigidity and strength, and has good electromagnetic shielding performance.

[0012] Further technical solutions of the present application: the air inlet mode of the air duct is designed to be labyrinth-shaped, the air inlets of the left and right side plates are located below the air inlets of the box body, a drainage grid is designed at the lowermost part of the air inlet grid, the lower opening is blocked by the reinforcing ribs of the side wall of the box body, even if water vapor enters the grid of the left and right side plates, the water droplets will flow out of the drainage grid under the action of gravity due to the weight.

[0013] Further technical solutions of the present application: the angle of the upper heat dissipation fins is between 140° and 168°.

[0014] Further technical solutions of the present application: the angle of the lower heat dissipation fins is between 70° and 80°.

[0015] A single soldier portable radar overall structure, characterized in that: comprising a transceiver box, the transceiver box is divided into two part cavities in structure by box air duct heat dissipation plate, respectively isolated and placed strong current and weak current module; the box, the antenna cover and the sealing rope form the front cavity, the front cavity is provided with a radio frequency front end sub-system, including an antenna array surface, a micro unit, a wave control / power supply unit and a transceiver assembly, integrated on a radio frequency front end mounting plate, M5 fasteners are adopted between the radio frequency front end mounting plate and the box; the box and the back cover plate form the rear cavity, and the rear cavity is provided with a positioning and orientation equipment control plate, a filter and a digital processing sub-system, integrated on an air duct cold plate.

[0016] Further technical solutions of the present application: the transceiver box is placed on the tripod for convenient carrying.

[0017] Further technical solutions of the present application: the M5 fastener adopts titanium alloy light material, so as to reduce the weight of the fastener.

[0018] Beneficial effects

[0019] The present application provides a double-cone-shaped independent heat dissipation air duct, which is composed of a box body and an air duct cold plate, and is in communication with the outside world. Each sub-system is sealed in the transceiver box and does not directly contact the air duct. The heat dissipation fins at the high-power device are designed to be high-low decreasing to form a symmetrical conical channel, so as to increase the air pressure at the air inlet and reasonably distribute the cooling flow. The heat at the air outlet is discharged by a fan, so as to solve the heat dissipation and sealing problem of the high-power device in the transceiver box. Since the heat dissipation air duct itself has a relatively low thermal inertia, the change of the environmental temperature can be transmitted to the inside of the box body through a large damping, and the environmental alternating stress suffered by each sub-system of the single soldier portable radar is relatively weak. The stress influence caused by the temperature cycle of the damp heat test is reduced to the minimum.

[0020] The present application also provides a single soldier portable radar overall structure. The whole box is designed to be fully sealed, and the antenna radiation cavity and the rear processing cavity are separated. Since the radar antenna radiation cavity needs to be transparent, only water vapor sealing is achieved. Through the independent heat dissipation air duct structure design, the radar sub-systems in the whole rear processing cavity are sealed and isolated from the outside world by the antenna installation metal back plate, the sealing rope, the box and the back plate, electromagnetic sealing and water vapor sealing of the rear processing cavity area are realized, and the waterproof and dustproof and electromagnetic compatibility requirements of the radar equipment are ensured.

[0021] The radar structure is from the whole machine, weighing each design constraint, so that it not only realizes the function, but also reduces the weight as far as possible. The weight and volume of single soldier portable radar are strictly required, the heat dissipation environment is limited, and it needs to adapt to the strong impact environment of air drop and air landing, which is not easy to realize in structure. The radar structure adopts a fully sealed design to meet the waterproof and dustproof and EMC requirements of single soldier portable radar equipment; the transceiver box body adopts a thin-walled laminated structure, which not only ensures the impact resistance performance but also reduces the weight of the box body; the integrated heat dissipation design based on double conical booster independent heat dissipation air duct not only solves the heat dissipation problem of high-power devices in the transceiver box body, but also saves the redundant connectors and cables, combines the printed board components, and reduces the weight and power consumption; while meeting the technical requirements of high-efficiency heat dissipation and strong impact resistance, the weight of the radar box body structure is only 9.9 kg, which is about 10% lighter than the original principle prototype, and the lightweight and miniaturization of the radar box body structure meets the design requirements. BRIEF DESCRIPTION OF DRAWINGS

[0022] The accompanying drawings are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application. In the drawings:

[0023] Figure 1 Fig. 1 is a schematic diagram of the overall structure of the radar;

[0024] Figure 2 Fig. 3 is a schematic diagram of the overall structure of the transceiver box;

[0025] Figure 3 Fig. 5 is an axonometric view of the main machine composition structure (front);

[0026] Figure 4 Fig. 7 is an axonometric view of the main machine composition structure (back);

[0027] Figure 5 Fig. 9 is an axonometric view of the box body frame structure;

[0028] Figure 6 Fig. 11 is a schematic diagram of the box body laminated thin-walled folding structure;

[0029] Figure 7 Fig. 13 is a schematic diagram of the conical air duct structure and cooling flow direction;

[0030] Figure 8 Fig. 15 is a schematic diagram of the independent air duct cavity and heat source position;

[0031] Figure 9 Fig. 17 is an installation position diagram of the radio frequency front end subsystem on the machine box;

[0032] Figure 10 Fig. 19 is a diagram of the composition and installation position of the radio frequency front end subsystem in the front cavity area of the main machine;

[0033] Figure 11 Fig. 21 is a diagram of the composition and installation position of each subsystem in the rear cavity area of the main machine;

[0034] Figure 12 Structure diagram of air duct cold plate;

[0035] Figure 13 Structure diagram of positioning and orientation device;

[0036] Figure 14 Structure diagram of positioning and orientation device;

[0037] Figure 15 Structure diagram of air duct cold plate;

[0038] Figure 16 Structure diagram of air duct cold plate;

[0039] Figure 17 Structure diagram of air duct cold plate;

[0040] Figure 18 Structure diagram of air duct cold plate;

[0041] Figure 19 Structure diagram of air duct cold plate.

[0042] In the drawings, 1 - box; 1 -1 box air duct heat conduction plate; 2 - antenna cover; 3 - right side plate; 4 - antenna array surface; 5 - right positioning and orientation device; 5-1 left mounting bracket; 5-2 left antenna; 6 - left positioning and orientation device; 6-1 right mounting bracket; 6-2 right antenna; 7 - upper cover plate; 8 - telescope; 9 - water bubble device; 10 - air duct cold plate; 10-1 sealing plate; 10-2 digital processing cold plate; 11 - left side plate; 12 - fan; 13 - rear cover plate; 14 - micro pump unit; 15 - wave control / power supply unit; 16 - transceiver assembly; 17 - positioning and orientation control board; 18 - filter; 19 - digital processing subsystem; 20 - general quick locking mechanism; 21 - pitch head; 22 - servo mechanism; 23 - tripod. DETAILED DESCRIPTION

[0043] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and should not be used to limit the present application. In addition, the technical features involved in the various embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0044] A new type of single soldier portable radar overall structure with double taper booster independent heat dissipation air duct, when the overall layout, the transceiver box is divided into two parts cavity in structure with air duct surface as boundary, respectively isolated weak and strong electricity module. Box 1, antenna cover 2 and sealing rope form the front cavity, the front cavity is equipped with radio frequency front end subsystem, including antenna array surface 4, micro unit 14, wave control / power unit 15 and transceiver assembly 16, etc., integrated on the radio frequency front end mounting plate, M5 above fastener between the radio frequency front end mounting plate and the box adopts titanium alloy light material, reduces the weight of fastener; Box 1 and back cover plate 13 form the rear cavity, the rear cavity is equipped with positioning and orientation equipment control board 17, filter 18 and digital processing subsystem 19, integrated on the air duct cold plate 10. The two parts integrated design omits the same function components, greatly reduces the connection cable, realizes the integrated design of line device structure.

[0045] The box 1 is the main body of the transceiver box structure and the protective shell of all subsystems, and is made of high-strength aviation aluminum alloy material (7075T651). The box 1 is combined and fixed with the left side plate 11, the right side plate 3, the upper cover plate 7 and the air duct cold plate 10 to form a closed thin-walled component, thereby enhancing the torsion resistance and shear resistance of the structure. The specific weight, size and impact resistance of a single person carrying are balanced, and the air duct heat conduction plate 1-1 and the left and right walls are designed as a laminated thin-walled structure. The air duct heat conduction surface is folded horizontally multiple times according to the thickness and size of each module, and the "paper folding load-bearing" principle is used to increase the rigidity of the contact surface, and to compensate for the inconsistent installation caused by the different heights of each module. Since the laminated thin-walled technology can significantly increase the rigidity of the box, the wall thickness can be minimized. The wall thickness of the main body of the radar box structure is 0.8 mm except for the installation surface of the load-bearing skeleton, and the wall thickness of the non-load-bearing surface is only 0.5-0.7 mm. After design optimization, the weight of the box is only 1.56 kg, the average wall thickness after weighting is 0.7 mm, the first-order natural frequency is as high as 120 Hz, and the strength and rigidity are very good. Due to the very thin wall thickness, in order to reduce residual stress and workpiece deformation, the box processing requires special tooling, and the box structure is designed to be symmetrical as much as possible, so that the tooling can be reused. The box part is mainly processed by cavity milling, and the thin-walled part has 18 cavities. Reasonable milling paths are selected during processing, the stress distribution is uniform during milling, the tool path, tool trajectory and tool idle stroke are short, and the processing precision is ensured. The upper cover plate 7 on the top of the box 1 is provided with a telescope 8 and a water bubble device 9. The telescope 8 is used for optical-electric axis consistency calibration, and has azimuth and elevation adjustment functions. The installation support is used to complete the azimuth and elevation adjustment functions, and the adjustment shafts are cylindrical rotating surfaces. After adjustment, the position is fixed by M4 thread friction pre-tightening. The water bubble device 9 is used for initial calibration and secondary confirmation of the reference during radar operation. The radome 2 and the rear cover plate 13 can be detached to complete the whole machine debugging. The left side plate 11 and the right side plate 3 are installed on the two sides of the box, and the left and right side plates are used for environmental protection and installation of the transceiver box.

[0046] The radome 2 is installed in front of the antenna array surface, and is a functional structure for protecting the antenna system or the entire microwave unit system from damage and destruction from the outside world, and has the functions of wave transmission, load bearing, impact resistance and heat insulation. The radome 2 adopts an A sandwich structure and has high specific strength and good transmission performance in a wide frequency range. The design parameters are as follows:

[0047] 1) Inner skin: 0.2 mm thick, dielectric constant 4.3, loss tangent less than or equal to 0.023;

[0048] 2) outer skin: 0.2 mm thick, dielectric constant 4.3; loss tangent less than or equal to 0.023;

[0049] 3) honeycomb core: 2.6 mm thick, dielectric constant 1.06, loss tangent 0.0035.

[0050] According to the requirements of the three-proof design, the electronic equipment of the radar must work in a sealed environment, due to the design constraints of miniaturization, small volume, tight space, easy to appear large electromagnetic interference, so the case is divided into two sealed installation of the front and rear cavities of the antenna radiation cavity and the post-processing cavity, avoiding electromagnetic interference between them. Since the radar itself needs to be transparent, and the external radiation waves of different wavelengths also need to pass through the radome into the front cavity, a sealing rope is designed between the radome 2 flange surface and the box body 1, so that the front cavity of the antenna radiation only has water vapor sealing function. The radiation energy injected from the antenna crack is electrically isolated through the isolator, limiter and circulator of the transceiver assembly, and the RF front end mounting plate is connected with the transceiver box by the sealing rope, completing the electromagnetic shielding of the rest of the intermediate frequency subsystem and the antenna radiation cavity of the rear cavity. The box body rear cavity is designed with four wiring space grooves to realize the cable connection between the wave control / power unit 15 and the digital processing subsystem 19, micro unit 14. The innermost layer of the carbon fiber structure rear cover plate 13 is a conductive copper mesh, and the rear plate is filled with hollow D-shaped conductive sealing rope between the radar box body of aluminum material, and a conductive sealing gasket is also installed on the air duct cold plate 10. Therefore, the sealing cavity composed of the rear cover plate 13, the box body 1 and the RF front end mounting plate makes the entire intermediate frequency subsystem of the rear cavity in a good electromagnetic environment of its own frequency band, including cable connectors and other special shielding treatment, which greatly reduces the weight of the connection cable protective sleeve. The connection between the antenna and the mounting box adopts multiple fixed bosses and hollow D-shaped gasket shielding sealing ropes to complete the electromagnetic sealing, and the flatness and parallelism of the positioning boss are both below 0.1 mm, which ensures the flatness requirement of the antenna installation, and the reserved compression gap is 0.5 mm, which ensures that the sealing rope can fully realize the electromagnetic shielding function. The water vapor sealing of the antenna radiation cavity, the independent air duct and the electromagnetic sealing and water vapor sealing of the post-processing cavity body together form a sealed environment for the single soldier portable radar whole machine.

[0051] The air duct cold plate 10 is composed of a sealing plate 10-1 and a digital processing cold plate 10-2, the digital processing cold plate 10-2 is connected with the sealing plate 10-1 by riveting, and the joint surface of the two is filled with conductive sealant. Since the positioning and orientation equipment control panel 17, the filter 18 and the digital processing subsystem 19 are installed on the air duct cold plate 10, the cold plate reserves installation parts. The air duct cold plate 10 is formed by a process method of combining carbon fiber, copper mesh and aluminum alloy, so that it meets the high heat density heat dissipation requirement, and has good rigidity and electromagnetic shielding performance. The sealing plate 10-1 is in the form of carbon fiber material laminated with copper mesh, which overcomes the poor electromagnetic shielding performance of carbon fiber parts by using the excellent high-frequency electromagnetic shielding and environmental corrosion resistance of copper mesh; the digital processing cold plate 10-2 is made of 6061 aluminum alloy material, which has good heat conduction performance, and has a plurality of heat dissipation fins arranged thereon, which are used for heat dissipation of the digital processing subsystem 19. In order to facilitate engineering implementation, the height and length direction fins are directly processed on the cold plate, and the other side of the cold plate is tightly attached to the digital processing subsystem 19 through a flexible heat conduction pad. At this time, the heat of the digital processing subsystem 19 is transferred to the heat dissipation fins on the inner wall of the air duct through heat conduction in the form of heat conduction with low thermal resistance, and the heat is taken away through the surface of the fins by forced air cooling. The digital processing cold plate 10-2 is designed with high and low pads on the outside, which are complementary to the height of the heating devices on the printed board of the digital processing subsystem 19, so that the height of the heating devices is consistent after the printed board of the digital processing subsystem 19 is installed, and the heating devices can be tightly attached to the cold plate through a 0.5mm thick heat conduction pad. Compared with the air duct cold plate made of aluminum material, the above structure can save about 200g of weight, which greatly reduces the weight of the air duct sealing element of the whole machine structure.

[0052] The single-soldier portable radar has sand and dust prevention requirements and rain test requirements under 18m / s wind speed, and considering that the radar structure has limited heat dissipation space, there are many modules inside the box that need to be cooled, and the heat dissipation mounting surface of the modules is large, so the traditional heat dissipation air duct cannot meet the heat dissipation requirements of the radar, and a double-cone independent air duct is designed to enhance the heat dissipation and environmental protection capability. The air duct is an independent hollow cavity formed by threadedly connecting the air duct heat conduction plate and the air duct cold plate 10, and the air duct inner surface is welded with upper and lower two sections of high-density light-weight heat dissipation fins. The upper heat dissipation fins of the air duct cold plate are located at the heat source positions of the transceiver assembly and the wave control / power supply unit; the lower heat dissipation fins are located at the heat source positions of the microwave unit, the digital processing subsystem, the filter and the like, and the heat generated by each module is transmitted to the air duct surface through a flexible heat conduction pad.

[0053] Considering the characteristics of the air duct, the air speed on both sides of the traditional air duct is large and the air speed in the middle is small, which causes uneven air pressure. Therefore, according to the direction of the cooling flow, the upper heat dissipation fins are designed to be high-low decreasing to form a symmetrical conical cross-section heat dissipation fin array assembly. The conical arrangement of the profile forms an air duct structure similar to the funnel's pressure boosting effect, which ensures the uniform cooling of the heat dissipation fins above each transceiver combination, while reducing the wind resistance and reducing the wind pressure loss. Since the value of the diffusion angle is too large or too small, it will increase the length of the pipeline and the energy loss along the way. Therefore, in practical applications, the value of the diffusion angle is usually limited to between 6°-20°, at which the energy loss is minimized. After repeated optimization design, the best diffusion angle of the radar is determined to be 18°, which ensures that the air volume passing through the array heat dissipation fins in the cavity is almost uniform.

[0054] The lower heat dissipation fins are close to the four fans 12 at the air outlet. The position distribution of the fans makes the middle fins hotter, and the air resistance on both sides of the box is larger. Therefore, the radar designs the fins in the air duct to be irregular conical structures in the length direction, forming a second symmetrical conical pressure boosting air duct to locally change the flow field and increase the efficiency of the fan convective heat transfer. In addition, due to the small internal size of the radar, the heat dissipation fins are inverted at an angle in the height direction to reduce wind resistance loss. Due to the sharing of the air duct and the heat dissipation fins, multiple heat dissipation parts of the subsystem are combined, saving a large amount of heat dissipation structure and greatly reducing the weight of the whole machine heat dissipation structure. The thickness of the heat dissipation fins is only 0.4mm, and after optimization of the structure form, it can reduce the weight by 150g compared with before optimization.

[0055] The air inlet of the air duct is located at the left and right side plate grid structure of the transceiver box. Due to the need of filtering rainwater and sand dust and other foreign matters entering and exiting the air inlet, the air inlet of the left side plate 3 and the right side plate 11 adopts a labyrinth design below the air inlet of the box. A drainage grid is designed at the lowermost part of the air inlet grid, and the reinforcing ribs of the side wall of the box block the lower opening. Even if water vapor enters the grid of the left and right side plates, the water droplets will flow out of the drainage grid under the action of gravity. This design avoids the direct entry of liquid water into the sealed air duct of the box, and the sealed air duct still has waterproof function when the radar is erected, withdrawn or used or transported at an angle. In addition, it can also prevent foreign matters and dust from entering the hollow air duct of the box and causing dust accumulation. The air flow passes through the cavity formed by the left side plate 3, the right side plate 11 and the box 1 structure, enters the independent cooling air duct of the box from the air inlets on the left and right sides of the upper part of the box 1, and four fans 12 are installed at the air outlet at the bottom of the box. When working, air flow is generated in the cooling air duct, and heat exchange is carried out between the air flow and the cooling fins, so that the heat on the cooling fins is discharged to the outside space. The fan 12 has a rotation speed feedback and control function, and a temperature sensor is provided on the digital processing module DSP chip. When the surface temperature of the sensor is detected to be lower than -10°, the fan 12 stops working. The fan 12 is installed on a detachable fan plate. In order to improve the efficiency of the fan convection heat exchange, the edge part where the fan plate is installed on the box 1 needs to be sealed. Sealant is used to fill the gaps generated during assembly of the parts.

[0056] The positioning and orientation device is installed on both sides of the single soldier portable radar transceiver box, mainly composed of left mounting bracket 5-1, right mounting bracket 6-1, positioning and orientation device control panel 17, left antenna 5-2 and right antenna 6-2 structure. Since the baseline requirement of the positioning and orientation device antenna is large, left and right mounting brackets are designed on the left and right sides of the box to pull apart the antenna baseline distance. The mounting bracket is made of carbon fiber and has a hollow structure, which not only reduces the weight, but also reduces the wind resistance during use. The remaining structure material is selected from 7075 aluminum alloy hard anodizing treatment, which has the advantages of corrosion resistance, light weight and good wear resistance. The conical positioning nut locking structure ensures the accuracy of repeated installation and positioning. The structure interface is a special-shaped interface with a circular upper and lower edge. Through the pre-tightening of the mounting nut, axial fastening can be achieved, and the position is reproduced by the line contact of the special-shaped circle. This structure can realize axial fixation and radial limiting during positioning, and the installation position is unique after the mounting nut is tightened. The positioning and orientation device realizes the accuracy of repeated positioning through the quick locking positioning mechanism. The bottom of the left and right cylindrical antennas is an SMA radio frequency connector, which is rotated and installed at the end of the bracket through the mounting thread of the connector.

[0057] The tilt head 21 is locked by M12 nut friction force, with large locking torque, simple and reliable, and meets the weight requirement. The tilt adjustment range is marked on the left and right sides, and the tilt range is -5° to +15°. The end of the locking handle is designed with a hexagonal pre-tightening wrench groove, which can be pre-tightened by a standard internal hex wrench when needed. The tilt head 21 is designed with two shafts, one is a tilt shaft, and the other is a locking shaft. Since the tilt head is locked by friction force, and the tilt head rotating shaft is already lubricated, it is not necessary to apply lubricant to the tilt head ball. The important parts of the tilt head have been super-hard surface treated, and the surface properties are good without additional maintenance.

[0058] The servo mechanism 22 is mainly divided into an upper rotating platform and a lower rotating platform. The upper rotating platform can rotate 360 degrees to realize full-range scanning and large-area warning of the radar. The rotating platform completes dynamic sealing during rotating movement through radial sealing ropes and longitudinal sealing ropes.

[0059] The general quick locking mechanism 20 is mechanically locked and serves as a quick connection. It is composed of an upper quick mounting plate 20-1 and a lower quick mounting plate 20-2. The upper quick mounting plate 20-1 is respectively mounted on the bottom of the individual portable radar, the bottom of the servo system 22. The lower quick mounting plate 20-1 is respectively mounted on the top of the tilt head 21, the top of the servo system 22, and the top of the tripod 23. Each connection body is provided with a 3 / 8 inch threaded interface, which is completely consistent with the interface of the general quick mounting plate structure of the tripod on the market, and has interchangeability, and can quickly switch different working modes.

[0060] The tripod 23 has a standing height of 1600 mm and a transportation length of 500 mm. The telescopic tube is made of carbon fiber. The rest is made of light and high-hardness aviation-grade aluminum alloy material 6061 (US military standard grade 3 hard anodizing surface treatment technology). It adopts a hollow variable cross-section structure, and precise numerical control processing ensures high accuracy of equipment adjustment. High-quality and strong T600 carbon fiber tubes with a diameter of 20 mm are selected, and an integrated 40 mm extension spacer is used at the telescopic tube foot joint to increase the overlapping area between the tubes to ensure stability and continuity when the tube feet are fully extended.

[0061] The individual portable radar transceiver box is composed of a box body, an air duct cold plate, an antenna cover, a rear cover plate, a left side plate, a right side plate, an upper cover plate, and other structural components. The box body is the protective shell of all subsystems of the main machine, and also has the function of environmental protection. The radio frequency front-end subsystem is installed on the radio frequency front-end mounting plate in the front cavity of the transceiver box, and the digital processing subsystem is installed on the air duct cold plate in the rear cavity of the transceiver box.

[0062] Considering the weight requirement of the radar carried on the back, the radar is mainly lightened and miniaturized through the following measures.

[0063] 1) Light material application. The transceiver box body selects 7075 (T651) aerospace aluminum alloy material, which is light and has good mechanical properties; titanium alloy light material is used for M5 and above fasteners; high-strength light carbon fiber composite material is used for positioning and orientation equipment mounting bracket, main machine rear cover plate, left and right side plates and upper cover plate, etc.

[0064] 2) Lightweight design. In addition to the mounting surface of the load-bearing framework, the remaining load-bearing main body wall adopts thin-walled high-stiffener structure; the antenna cover, rear cover plate and air duct cold plate adopt variable thickness / variable material structure; the mounting bracket adopts a hollow structure; the tube of the tripod adopts a hollow variable cross-section structure, etc.

[0065] 3) Line component integration design. In order to meet the requirements of electrical performance and weight, considering the size space limitation, the feeder network adopts waveguide series feed form, the main waveguide and auxiliary waveguide share the wall design, and the energy distribution is realized through the coupling slot, effectively saving the size space; the receiving and frequency synthesis units are integrated into a micro unit, and the signal transmission between them is completed by soldering, which not only increases the reliability of signal transmission, but also eliminates unnecessary RF coaxial connectors and semi-rigid cables; the RF front-end subsystem and digital processing subsystem share hardware, and the functions are realized by software time-sharing, which not only facilitates signal transmission, but also eliminates redundant connectors and cables, reduces weight and power consumption, and realizes the integration of line components;

[0066] 4) Integrated heat dissipation air duct design. The air duct and heat dissipation fins of each subsystem are shared, saving a large amount of heat dissipation structure and greatly reducing the weight of the whole machine heat dissipation structure.

[0067] Considering the anti-impact performance requirements of the radar during air drop and air landing, the radar improves the anti-impact performance under the condition of lightweight mainly through the following measures.

[0068] 1) In order to increase the dynamic strength of the box structure, the box structure is integrally formed, adopts frame type load-bearing design, and the remaining load-bearing main body adopts laminated thin-walled design technology in addition to the mounting surface of the load-bearing framework. Multiple laminated thin-walled folding structures are designed, which increase many frame-like structures, increase the rigidity of the structure under the premise of reducing weight, realize modal shift, change the first-order natural modal, avoid the large-area deformation modal of the installed antenna array surface in the air drop and transportation state, and suppress the internal influence caused by impact;

[0069] 2) The high-strength aerospace aluminum material and carbon fiber material used in the machine case can meet the overload requirements of anti-impact;

[0070] 3) The air duct cold plate adopts a processing method of carbon fiber, copper mesh and aluminum alloy composite forming, which meets the high heat density heat dissipation requirements on the basis of lightweight, and has good rigidity and strength;

[0071] Considering that the radar space size is limited, the space is compact, and the ventilation and heat dissipation are difficult, the radar mainly improves the heat dissipation efficiency through the air duct design under the constraint of lightweight conditions.

[0072] The above merely describes specific embodiments of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of various equivalent modifications or replacements within the technical range disclosed by the present application, and these modifications or replacements shall be encompassed within the protection scope of the present application.

Claims

1. A dual-cone pressurized independent heat dissipation air duct, characterized in that... The enclosure comprises an independent hollow cavity formed by assembling a heat-conducting plate and a cold plate. The heat-conducting plate has two sections of heat dissipation fins: the upper fins are located at the heat source positions of the transceiver assembly and the wave controller / power supply unit; the lower fins are located at the heat source positions of the microwave unit. The upper fins are designed with decreasing heights to form a symmetrical conical cross-section heat dissipation fin array assembly, similar to the pressure-boosting effect of a funnel. The lower fins are designed with an irregular conical structure along their length. The cold plate includes a sealing plate and a digital processing cold plate. The sealing plate has a groove for mounting the digital processing cold plate. The positioning and orientation equipment control board, filter, and digital processing subsystem are mounted on one side of the digital processing cold plate. The other side of the digital processing cold plate has heat dissipation fins, which are at the same height as the lower fins. The air inlets of the duct are located on the left and right sides of the enclosure, and the air exits through the upper and lower fins, respectively, from four vents located below the lower fins. The heat-conducting plate of the air duct of the box adopts a layered thin-walled design. It is folded horizontally multiple times according to the thickness of each module installed on it. By using the "paper folding load-bearing" principle, the rigidity of the contact surface is increased, and the installation inconsistency caused by the different heights of each module can also be compensated. The air duct cooling plate is made of carbon fiber, copper mesh and aluminum alloy composite molding process, which makes it meet the requirements of high heat density heat dissipation, while also having good rigidity and electromagnetic shielding performance. The air intake method of the air duct adopts a labyrinth design. The air inlets of the left and right side panels are located below the air inlet of the box. A drainage grid is designed at the bottom of the air intake grid. The lower opening is blocked by the reinforcing ribs of the side wall of the box. Even if water vapor enters the grid of the left and right side panels, the water droplets will flow out from the drainage grid due to gravity. The angle of the upper heat dissipation fins is between 140° and 168°. The angle of the cone shape of the lower heat dissipation fins is between 70° and 80°.

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