A heat dissipation structure for active ground wave radar based on chimney effect

Abstract

The present invention discloses an active ground wave radar heat dissipation structure based on the chimney effect, comprising a base, a transmitting module, a lower rod, and an upper rod coaxially arranged from bottom to top; an air inlet is provided at the bottom of the transmitting module; the lower and upper rods are both hollow structures, and an air outlet is provided on the top side wall of the upper rod; the air inlet, the hollow cavity of the lower rod, the hollow cavity of the upper rod, and the air outlet together constitute a chimney channel, and the effective height of the chimney channel shall not be less than 5m; the area of ​​the air outlet is close to the area of ​​the air inlet; and a light-transmitting cover with a heat-collecting material attached is provided in the middle of the chimney channel. The present invention is based on the self-suction effect of the chimney effect, which increases the air flow rate in the air flow channel, enhances the air convection effect on the surface of the heat dissipation fins, and improves the heat dissipation efficiency, thereby meeting the use requirements of passive heat dissipation and improving the safety and reliability of the active ground wave radar. In addition, the light-transmitting cover can increase the temperature at the midpoint of the chimney channel, making the wind speed at the air outlet greater than the wind speed at the midpoint, effectively improving the thermal pressure ventilation effect.

Description

Technical Field

[0001] This invention relates to the field of radar heat dissipation technology, and in particular to an active ground wave radar heat dissipation structure based on the chimney effect. Background Technology

[0002] High-frequency ground wave radar emits vertically polarized electromagnetic waves that diffract along the coastal plane, resulting in minimal propagation attenuation and independence from the Earth's curvature. This enables over-the-horizon detection of targets and long-range marine environmental monitoring. During radar operation, components such as power amplifiers and power supplies generate significant heat. If this heat cannot be dissipated effectively and promptly, it can lead to heat buildup and overheating within the devices, ultimately causing performance degradation, impacting device lifespan, or even damage.

[0003] Existing heat dissipation methods are divided into two categories: active and passive. Active heat dissipation requires external driving force, such as fans or water pumps, to create forced air or liquid cooling to achieve the purpose of heat dissipation. Active ground wave radar operates in coastal environments and is generally installed on cliffs, steep slopes, and other terrains, often accompanied by typhoons and other weather events. Therefore, active heat dissipation equipment is prone to damage and difficult to repair. At the same time, active heat dissipation increases additional power consumption and is not suitable for ground wave radar in complex environments where wiring is difficult. Passive heat dissipation does not require additional power consumption or heat dissipation equipment. It relies on heat sinks to transfer heat to the air through natural convection, but the heat dissipation effect is not as good as active heat dissipation. To improve the heat dissipation effect, the contact area between the heat sink fins and the air is generally increased. However, increasing the contact area between the fins and the air inevitably leads to an increase in the size and number of heat sink fins, which results in an increase in the mass of the heat sink fins and the overall size of the device. At the same time, a dense heat sink fin can also affect airflow and fail to achieve effective heat dissipation. Therefore, an efficient passive heat dissipation structure is particularly important for the safety and reliability of active ground wave radar products. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to address the shortcomings of the prior art by providing an active ground wave radar heat dissipation structure based on the chimney effect. This active ground wave radar heat dissipation structure based on the chimney effect can effectively reduce the temperature of active ground wave radar devices without increasing power consumption or requiring daily maintenance, thereby improving the reliability and safety of the equipment.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0006] An active ground wave radar heat dissipation structure based on the chimney effect includes a base, a lower section rod, and an upper section rod arranged coaxially from bottom to top.

[0007] An active ground wave radar consists of a transmitting module and an antenna mast.

[0008] The transmitting module includes a heat-generating device, which has a heat dissipation cavity and heat dissipation fins evenly distributed vertically in the heat dissipation cavity.

[0009] The transmitter module is mounted on the top of the base, and the bottom of the transmitter module, located on the outer periphery of the base, has an air inlet that communicates with the heat dissipation cavity.

[0010] The top of the heating element is provided with a mounting hole for the lower section rod, which is used to connect to the bottom of the lower section rod.

[0011] Both the lower and upper sections of the rod are hollow structures. An air vent is provided on the top side wall of the upper section, and the antenna rod is coaxially mounted on the top surface of the upper section.

[0012] The air inlet, the hollow cavity of the lower section rod, the hollow cavity of the upper section rod, and the air outlet together constitute the chimney passage, and the effective height of the chimney passage shall not be less than 5m.

[0013] The area of ​​the air outlet is smaller than the area of ​​the air inlet.

[0014] A light-transmitting cover is provided at the top of the lower section or the bottom of the upper section, and heat-collecting material is attached to the light-transmitting cover.

[0015] The ratio of the area of ​​the air outlet to the area of ​​the air inlet is close to 1.

[0016] The ratio of the area of ​​the air outlet to the area of ​​the air inlet is 0.87.

[0017] The effective height of the chimney duct is 5066mm. The light-transmitting cover is located on the upper section of the rod 1208mm below the air outlet. The light-transmitting cover is made of arc-shaped plexiglass with a height × width of 100mm × 500mm.

[0018] The inner diameter of the upper section is smaller than the inner diameter of the lower section.

[0019] The inner diameter of the upper section is 130mm, and the inner diameter of the lower section is 150mm.

[0020] By increasing the effective height H of the chimney passage, and increasing the inlet area A1 and outlet area A2, the air convection effect can be effectively improved, and the natural ventilation volume N can be increased; the formula for calculating the natural ventilation volume N is:

[0021]

[0022] Among them, t n t represents the temperature of the heating element. w The ambient temperature.

[0023] t n The design value is 65℃, t nThe actual value is obtained by setting up several temperature measuring points on the heating device and taking the average value.

[0024] The lower rod, upper rod, and heat dissipation fins are all made of aluminum.

[0025] The heat-generating components include power amplifier components and power supply components.

[0026] The present invention has the following beneficial effects:

[0027] 1) This invention enhances natural convection heat dissipation based on the self-suction effect of the chimney effect. The invention extends a lower and upper section of the transmitter module vertically upwards to form a cylindrical body, i.e., a chimney channel. Based on the self-suction effect generated by the chimney effect, the air velocity within the airflow channel is increased, enhancing the air convection effect on the surface of the heat dissipation fins. This improves upon the shortcomings of poor convection heat transfer, ineffective heat dissipation, and high device temperatures caused by factors such as high fluid temperature, small heat exchange temperature difference, low airflow velocity, and excessive angle between the temperature gradient and the fluid velocity field on the heat dissipation fins of heat-generating components such as the power amplifier and power supply components in the transmitter module.

[0028] 2) Thermal pressure is the gravitational pressure difference caused by the temperature difference between the air inside and outside the structure. When the indoor temperature is higher than the outdoor temperature, the upper part of the structure will have higher pressure, while the lower part will have lower pressure. When there are openings at the top and bottom, air enters through the lower opening and flows out through the upper opening, which is the "chimney effect". Different elevation differences produce different vertical air pressure differences under different temperature conditions. The greater the elevation difference and the higher the temperature, the greater the pressure difference and the stronger the chimney effect. In a typical chimney channel, the outlet temperature is the highest, and the wind speed at the midpoint is greater than the outlet wind speed, and thus greater than the inlet wind speed. However, in this invention, by adding a light-transmitting cover in the middle of the chimney channel and attaching heat-collecting material to the cover, the temperature at the midpoint of the chimney channel can be increased under different external environments and temperatures, making the midpoint temperature the highest. Consequently, the outlet wind speed is greater than the midpoint wind speed, and the midpoint wind speed is greater than the inlet wind speed. According to Bernoulli's equation in fluid mechanics, the greater the fluid velocity, the greater the dynamic pressure and the smaller the static pressure. When the air velocity at the outlet is at its maximum, its static pressure is at its minimum. The static air pressure of the entire structure gradually decreases from bottom to top. Therefore, this invention can effectively improve the thermal pressure ventilation effect.

[0029] 3) By increasing the effective height of the chimney passage and enlarging the inlet area, the air convection effect can be effectively improved. The effective height of the chimney passage must not be less than 5m. Furthermore, according to the formula for natural ventilation volume under thermal pressure, with a constant temperature difference between the inside and outside of the chimney passage and a fixed effective height, the closer the areas of the outlet and inlet are, the greater the ventilation volume. Therefore, a ratio of outlet to inlet area close to 1 can effectively increase the natural ventilation volume of the chimney passage.

[0030] 4) This invention has a simple structure. Based on the heat dissipation fins of traditional heat dissipation devices, a chimney channel extends upwards. The added chimney channel consists of two round tubes connected by a flange or threads. Furthermore, the chimney channels described in this invention are all made of aluminum, which has the advantages of convenient processing and low manufacturing cost. Attached Figure Description

[0031] Figure 1 This invention illustrates the overall structure of an active ground wave radar heat dissipation structure based on the chimney effect. Figure 1 .

[0032] Figure 2 This invention illustrates the overall structure of an active ground wave radar heat dissipation structure based on the chimney effect. Figure 2 .

[0033] Figure 3 An exploded view of the launching module in this invention is shown.

[0034] Figure 4 A longitudinal sectional view of the launching module in this invention is shown.

[0035] Figure 5 The diagram shows a comparison of the heat dissipation effects of the present invention and two existing heat dissipation methods.

[0036] Among them are:

[0037] 1. Base; 2. Transmitter module; 21. Lower section rod mounting hole; 22. Heat dissipation cavity; 23. Heat dissipation fins; 3. Lower section rod; 4. Upper section rod; 5. Antenna rod; 6. Light-transmitting cover; 7. Power amplifier assembly; 8. Power supply assembly; 9. Chimney channel; 91. Air inlet; 92. Air outlet. Detailed Implementation

[0038] The present invention will now be described in further detail with reference to the accompanying drawings and specific preferred embodiments.

[0039] In the description of this invention, it should be understood that the terms "left side," "right side," "upper part," "lower part," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. "First," "second," etc., do not indicate the importance of the components, and therefore should not be construed as a limitation of this invention. The specific dimensions used in this embodiment are only for illustrating the technical solution and do not limit the scope of protection of this invention.

[0040] like Figure 1 and Figure 2 As shown, an active ground wave radar heat dissipation structure based on the chimney effect includes a base 1, a lower rod 3, and an upper rod 4 arranged coaxially from bottom to top.

[0041] like Figure 1 , Figure 3 and Figure 4 As shown, the active ground wave radar includes a transmitting module 2 and an antenna mast 5.

[0042] The transmitting module includes a heat-generating device, preferably a power amplifier assembly and a power supply assembly. The heat-generating device has a heat dissipation cavity 22 and heat dissipation fins 23 uniformly arranged vertically within the heat dissipation cavity. The heat dissipation fins are preferably made of aluminum.

[0043] The transmitter module is mounted on the top of the base, and the bottom of the transmitter module, located on the outer periphery of the base, is provided with an air inlet 91 that communicates with the heat dissipation cavity.

[0044] The top of the heating element is provided with a lower section rod mounting hole 21 for connecting to the bottom of the lower section rod.

[0045] Both the lower and upper sections of the rod are hollow structures and are preferably made of aluminum.

[0046] An air outlet 92 is provided on the top side wall of the upper section of the mast, and the antenna mast is coaxially mounted on the top surface of the upper section of the mast.

[0047] The air inlet, the hollow cavity of the lower section rod, the hollow cavity of the upper section rod, and the air outlet together constitute the chimney channel 9. The effective height of the chimney channel shall not be less than 5m, and in this embodiment, it is preferably 5066mm.

[0048] The inner diameter of the upper section is preferably smaller than that of the lower section. In this embodiment, it is further preferred that the inner diameter of the upper section is 130mm and the inner diameter of the lower section is 150mm.

[0049] A light-transmitting cover 6 is provided at the top of the lower section or the bottom of the upper section, and heat-collecting material is attached to the light-transmitting cover. The light-transmitting cover is preferably located on the upper section of the rod 1208mm below the air outlet, and the light-transmitting cover is preferably made of arc-shaped plexiglass with a height × width of 100mm × 500mm.

[0050] The aforementioned light-transmitting cover and attached heat-collecting material can increase the temperature at the midpoint of the chimney channel, making the air velocity at the chimney channel outlet greater than the midpoint air velocity, effectively improving the thermal pressure ventilation effect. Based on the self-drafting effect of the chimney, the air velocity within the airflow channel is increased, enhancing the air convection effect on the surface of the heat dissipation fins, improving heat dissipation efficiency, thus meeting the requirements for passive heat dissipation and improving the safety and reliability of the active ground wave radar.

[0051] By increasing the effective height H of the chimney passage, and increasing the inlet area A1 and outlet area A2, the air convection effect can be effectively improved, and the natural ventilation volume N can be increased; the formula for calculating the natural ventilation volume N is:

[0052]

[0053] Among them, t n t represents the temperature of the heating element. w The ambient temperature.

[0054] t n The design value is 65℃, t n The actual value is obtained by testing at several temperature measuring points on the heating element and taking the average value. In this application, it is preferred that five temperature measuring points are arranged.

[0055] From the above formula for natural ventilation volume, it can be concluded that, under the condition that the temperature difference between the inside and outside of the chimney passage is constant and the effective height of the chimney passage remains unchanged, the closer the areas of the air outlet and the air inlet are, the greater the ventilation volume. Therefore, the ratio of the areas of the air outlet and the air inlet is close to 1, and in this embodiment, it is preferably 0.87, thereby effectively improving the natural ventilation volume of the chimney structure.

[0056] The heat generated by the power amplifier and power supply components in the aforementioned transmitting module during operation is transferred to the heat dissipation cavity of the transmitting module through aluminum heat sink fins, and then enters the hollow lower and upper sections of the rod based on the chimney effect. Finally, the heat is dissipated to the external environment through the air outlet at the top of the upper section. Simultaneously, the light-transmitting cover in this invention can increase the temperature at the midpoint of the chimney structure, making the air velocity at the chimney outlet greater than the midpoint air velocity, effectively improving the thermal pressure ventilation effect. Based on the self-suction effect of the chimney, the air velocity within the airflow channel is increased, enhancing the air convection effect on the surface of the heat sink fins, improving heat dissipation efficiency, thereby meeting the requirements for passive heat dissipation and improving the safety and reliability of the active ground wave radar.

[0057] Based on the structural parameters of this example, temperature measurement experiments were conducted on the traditional heat sink fins, active fan cooling, and the structure of this invention, and the results were statistically compared. Figure 5 As shown, the power amplifier and power supply components have a power of 500W and a heat conversion rate of over 50%. When the ambient temperature is 30℃, the heat sink fins on the components control the temperature to around 85℃. If six 12V / 1.68A active cooling fans are used, the component temperature can be reduced from 85℃ to 55℃. If the passive heat dissipation chimney structure described in this invention is used, the component temperature can be reduced from 85℃ to 65℃. This satisfies both the requirement that the component operating temperature must not exceed 70℃ and the requirement that passive heat dissipation can only be used due to the limitations of the active ground wave radar operating environment.

[0058] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present invention, various equivalent transformations can be made to the technical solutions of the present invention, and these equivalent transformations all fall within the protection scope of the present invention.

Claims

1. A heat dissipation structure for active ground wave radar based on the chimney effect, characterized in that: It includes a base, a lower section rod, and an upper section rod arranged coaxially from bottom to top; Active ground wave radar includes a transmitting module and an antenna mast; The transmitting module includes a heat-generating device, which has a heat dissipation cavity and heat dissipation fins evenly distributed vertically in the heat dissipation cavity; The launch module is mounted on the top of the base, and the bottom of the launch module, located on the outer periphery of the base, has an air inlet that communicates with the heat dissipation cavity. The top of the heating element is provided with a mounting hole for the lower section rod, which is used to connect to the bottom of the lower section rod; Both the lower and upper sections of the rod are hollow structures. An air vent is provided on the top side wall of the upper section, and the antenna rod is coaxially mounted on the top surface of the upper section. The air inlet, the hollow cavity of the lower section rod, the hollow cavity of the upper section rod, and the air outlet together constitute the chimney passage, and the effective height of the chimney passage shall not be less than 5m; The area of ​​the air outlet is smaller than the area of ​​the air inlet; A light-transmitting cover is provided at the top of the lower section or the bottom of the upper section, and heat-collecting material is attached to the light-transmitting cover; By adding a light-transmitting cover in the middle of the chimney channel and attaching heat-collecting material to the cover, the temperature at the middle point of the chimney channel can be increased under different external environments and temperatures, making the temperature at the middle point the highest. Consequently, the air velocity at the chimney outlet is greater than the air velocity at the middle point, and the air velocity at the middle point is greater than the air velocity at the inlet. According to Bernoulli's equation in fluid dynamics, when the air velocity at the outlet is at its maximum, its static pressure is at its minimum. The static pressure of the air in the overall structure gradually decreases from bottom to top. Therefore, it can improve the thermal pressure ventilation effect and enhance the air convection effect on the surface of the heat dissipation fins. Under the passive heat dissipation method, the operating temperature of the active ground wave radar is kept below 70°C.

2. The active ground wave radar heat dissipation structure based on the chimney effect according to claim 1, characterized in that: The ratio of the area of ​​the air outlet to the area of ​​the air inlet is close to 1.

3. The active ground wave radar heat dissipation structure based on the chimney effect according to claim 2, characterized in that: The ratio of the area of ​​the air outlet to the area of ​​the air inlet is 0.

87.

4. The active ground wave radar heat dissipation structure based on the chimney effect according to claim 1, characterized in that: The effective height of the chimney duct is 5066mm. The light-transmitting cover is located on the upper section of the rod 1208mm below the air outlet. The light-transmitting cover is made of arc-shaped plexiglass with a height × width of 100mm × 500mm.

5. The active ground wave radar heat dissipation structure based on the chimney effect according to claim 1, characterized in that: The inner diameter of the upper section is smaller than the inner diameter of the lower section.

6. The active ground wave radar heat dissipation structure based on the chimney effect according to claim 5, characterized in that: The inner diameter of the upper section is 130mm, and the inner diameter of the lower section is 150mm.

7. The active ground wave radar heat dissipation structure based on the chimney effect according to claim 1, characterized in that: Increasing the effective height of the chimney passage and expanding the area of ​​the air inlet and outlet can effectively improve air convection and increase natural ventilation.

8. The active ground wave radar heat dissipation structure based on the chimney effect according to claim 7, characterized in that: The design temperature of the heating element is 65℃. The actual temperature of the heating element is obtained by testing at several temperature measuring points on the heating element and taking the average value.

9. The active ground wave radar heat dissipation structure based on the chimney effect according to claim 1, characterized in that: The lower rod, upper rod, and heat dissipation fins are all made of aluminum.

10. The active ground wave radar heat dissipation structure based on the chimney effect according to claim 1, characterized in that: The heat-generating components include power amplifier components and power supply components.

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