An active drag-reducing shark fin antenna

Abstract

The present invention relates to the technical field of automobile antennas, and discloses an active drag-reducing shark fin antenna, comprising a shark fin body provided with an antenna cavity and a power cavity, wherein a jet device is provided in the power cavity; the jet device comprises a first air supply turntable, a second air supply turntable, an air inlet channel, and an air outlet channel; the first air supply turntable comprises a first turntable belt, on which a plurality of first air supply plates are evenly spaced, the second air supply turntable comprises a second turntable belt, on which a plurality of second air supply plates are evenly spaced, the first air supply plates and the second air supply plates are the same in size, the spacing between adjacent first air supply plates is the same as the spacing between adjacent second air supply plates, and the adjacent first air supply plates and the second air supply plates are staggered front and back to form a compressed air cavity, one end of the air outlet channel is connected to the compressed air cavity, and the other end is connected to the jet port on the shark fin body, which has the advantage that the drag-reduction capability of the shark fin antenna can be further enhanced, and design redundancy can be provided for further balancing the antenna strength.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile antennas, and in particular to an active drag-reducing shark fin antenna. Background Art

[0002] When a car is driving, the aerodynamic resistance mainly comes from the pressure difference resistance between the front and rear of the car body. The pressure difference resistance between the front and rear of the car body is mainly because the airflow at the top, side and bottom of the rear of the car separates and interacts at the rear of the car, forming an extremely complex flow field and vortex structure. The tail vortex is accompanied by energy loss, which increases the car's driving resistance.

[0003] In the prior art, shark fin antennas are installed on the roof or the rear of the vehicle to help optimize the airflow at the rear of the vehicle and make the vehicle body more stable. By reducing air turbulence, it helps reduce the instability caused by wake flow and enhances the overall stability of the vehicle. However, the height of the shark fin antenna is also proportional to the signal strength of the antenna, while the height of the shark fin structure is not proportional to the drag reduction effect. When a certain antenna height is required to ensure the antenna signal, a certain drag reduction effect is often sacrificed.

[0004] In summary, there is an urgent need for an active drag-reducing shark fin antenna that can further enhance the drag reduction capability of the shark fin antenna and provide design redundancy to further balance the antenna strength. Summary of the invention

[0005] In view of the drag reduction problem of shark fin antennas in the prior art, an active drag reduction shark fin antenna is proposed, which can further enhance the drag reduction capability of the shark fin antenna and provide design redundancy for further balancing the antenna strength.

[0006] In order to solve the above problems, the technical solution of the present invention is:

[0007] An active drag-reducing shark fin antenna comprises a shark fin body, wherein the shark fin body is provided with an antenna cavity and a power cavity, wherein the power cavity is provided with an air jet device; the air jet device comprises a first air supply turntable, a second air supply turntable, an air inlet channel, and an air outlet channel; the first air supply turntable comprises a first turntable belt, wherein a plurality of first air supply plates are evenly spaced on the first turntable belt, and the second air supply turntable comprises a second turntable belt, wherein a plurality of second air supply plates are evenly spaced on the second turntable belt, wherein the first air supply plate and the second air supply plate have the same size, and the first air supply turntable and the second air supply turntable are arranged in parallel; on the adjacent first turntable belt and the second turntable belt, the end of the first air supply plate is fitted with the second turntable belt, and the end of the second air supply plate is fitted with the first turntable belt, and the adjacent first air supply plates and the second air supply plates are staggered front and back to form an air pressure cavity; the air outlet channel is connected with the air pressure cavity, and one end of the air outlet channel is an air jet port on the shark fin body; the first air supply turntable and the second air supply turntable are respectively connected with the air inlet channel.

[0008] As a preferred technical solution, the air inlet of the air inlet channel is arranged on the windward surface of the shark fin body.

[0009] As a preferred technical solution, the air intake channel connected to the first air supply turntable faces the first air supply plate far away from the second air supply turntable; the air intake channel connected to the second air supply turntable faces the second air supply plate far away from the first air supply turntable.

[0010] As a preferred technical solution, the distances between the first air supply plates and the second air supply plates staggered front and back are equal, so that the sizes of the air pressure cavities are equal.

[0011] As a preferred technical solution, the air jet is arranged at the leading edge of the shark fin antenna.

[0012] As a preferred technical solution, sealing gaskets are provided at one end of the first air supply plate away from the first turntable belt and one end of the second air supply plate away from the second turntable belt.

[0013] As a preferred technical solution, the air outlet channel contracts from the air pressure chamber toward the air jet port.

[0014] As a preferred technical solution, the first air supply turntable and the second air supply turntable are provided with a driving mechanism for driving them to rotate synchronously.

[0015] Beneficial effects of the present invention:

[0016] 1. The active drag-reducing shark fin antenna of the present invention constructs a continuous gas source channel by utilizing external airflow; the gas is transported and compressed by using the first air supply turntable and the second air supply turntable arranged in parallel, and then discharged at high speed through the air outlet channel and the air jet port, so that the drag of the car can be reduced by using the injected gas, and there is no need to install an air pump on the car, which greatly reduces the maintenance cost.

[0017] 2. The airflow carried by the first air supply plate and the second air supply plate of the active drag-reducing shark fin antenna of the present invention flows through the interior of the shark fin body, which can take away the heat generated by components such as the internal antenna, and to a certain extent assist in the heat dissipation of the components.

[0018] 3. The air outlet channel of the active drag-reducing shark fin antenna of the present invention not only takes away the heat generated by the antenna module, but also when the compressed air cavity is formed, the compressed air will generate corresponding heat, and the temperature of the ejected gas will increase, so that the shark fin antenna can be dried and de-iced when the temperature is low. In order to prevent the heat of the heated gas from affecting the antenna module, heat insulating materials are provided at least on the upper baffle of the pressure cavity and the side walls around the air outlet channel. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a three-dimensional schematic diagram of an active drag-reducing shark fin antenna according to the present invention;

[0020] Figure 2 This is a bottom view of an active drag-reducing shark fin antenna according to the present invention;

[0021] Figure 3 A cross-sectional view of a shark fin body of an active drag-reducing shark fin antenna according to the present invention;

[0022] Figure 4 Another cross-sectional view of a shark fin body of an active drag-reducing shark fin antenna according to the present invention;

[0023] Figure 5 This is a cross-sectional schematic diagram of an active drag-reducing shark fin antenna according to the present invention from the power cavity;

[0024] Figure 6 This is a schematic longitudinal section of an active drag-reducing shark fin antenna according to the present invention.

[0025] The reference numerals and components involved in the drawings are as follows:

[0026] 1. Shark fin body; 2. Antenna cavity; 3. Power cavity; 4. Jet device; 11. Baffle; 41. First air supply turntable; 42. Second air supply turntable; 43. Air inlet channel; 44. Air outlet channel; 45. Compressed air cavity; 411. First turntable belt; 412. First air supply plate; 421. Second turntable belt; 422. Second air supply plate; 431. Air inlet; 441. Jet outlet. DETAILED DESCRIPTION

[0027] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the drawings of the specification. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] In order to better understand the active drag reduction shark fin antenna provided by the present embodiment, the existing active drag reduction shark fin antenna is briefly introduced below. The existing active drag reduction shark fin antenna mainly balances the relationship between the drag reduction demand and the antenna strength by controlling the lifting and lowering of the shark fin antenna. For example, when the shark fin antenna is raised, the antenna height increases and the antenna's ability to receive signals is enhanced. When the priority of drag reduction is increased, the antenna's signal strength is sacrificed to reduce the shark fin antenna height to the optimal drag reduction height. Obviously, the above scheme can only balance the drag reduction effect and signal strength of the shark fin antenna. There is a trade-off between the signal strength and the balance boundary between the two, and no improvement is made. In some other schemes, air outlets are set on the surface of the shark fin antenna to delay flow separation, reduce eddy current intensity, and balance pressure distribution to reduce resistance. However, this scheme requires an air pump to supply air to the air outlet, as shown in the Chinese patent application with publication number CN118738821A, entitled "An Active Drag Reduction Shark Fin Antenna, Method and Automobile". When the gas in the air pump is used up, it is necessary to replenish the gas or replace the air pump, which makes subsequent maintenance complicated, and its sustainability is limited by the capacity of the air pump.

[0029] In order to solve the above problems, the present invention provides an active drag reduction shark fin antenna, which is specifically described as follows:

[0030] Please see attached Figure 1 , Attachment Figure 2 ; Figure 1 For stereogram, Figure 2 is a bottom view; an active drag-reducing shark fin antenna, comprising a shark fin body 1, the shark fin body 1 is a streamlined structure for reducing wind resistance, which is a prior art and is usually arranged at the rear of the top of a car to cut the air vortex on the roof to reduce wind resistance, reduce fuel consumption and noise; in this embodiment, the shark fin body 1 is divided into an upper and lower chamber, see the attached Figure 3 , Figure 3 The figure is a longitudinal section diagram of the shark fin body 1. The upper cavity is the antenna cavity 2, and the lower cavity is the power cavity 3. The antenna cavity 2 is used to integrate and install the corresponding antenna module, etc. The antenna module and its installation are prior art and are not shown in the figure. Figure 3 In the shark fin body 1, the first turntable belt 411 and the second turntable belt 421 described below are used to construct the air flow channel. Figure 4 A longitudinal section of another shark fin body 1 is shown, which has enclosures at the inner centers of the first turntable belt 411 and the second turntable belt 421 described below, and directly places the jet device 4 described below in a power chamber 3 that provides an independent chamber, without using the body of the jet device 4 to construct the cavity. This is another implementation method and will not be described in detail below.

[0031] Please see attached Figure 5 The power chamber 3 is used to set a jet device 4, which can spray airflow to the outer surface of the shark fin body 1 to achieve active drag reduction and improve the drag reduction effect of the shark fin. Compared with the prior art, under the same drag reduction requirements, the shark fin antenna can be relatively raised higher to obtain a stronger signal; correspondingly, under the same height of the shark fin, its drag reduction effect can be enhanced. Therefore, the design redundancy of the shark fin antenna can be improved in application.

[0032] Please see attached Figure 5 , Attachment Figure 6 The jet device 4 includes a first air supply turntable 41, a second air supply turntable 42, an air inlet channel 43, and an air outlet channel 44. Specifically, the first air supply turntable 41 includes a first turntable belt 411, and a plurality of first air supply plates 412 are evenly arranged on the first turntable belt 411 at equal intervals. The first air supply plates 412 rotate with the first turntable belt 411. The first turntable belt 411 is a waist-shaped conveyor belt structure. Corresponding baffle plates 11 structures are respectively arranged at the upper and lower ends of the first turntable belt 411. The baffle 11 is provided with a guide groove for the first turntable belt 411 to rotate. In some embodiments, the first turntable belt 411 and the guide groove are movably connected by structures such as balls and rollers to reduce the friction when the first air supply turntable 41 rotates, which is beneficial to using wind force to push it to move along the guide groove. Specifically, balls are embedded on both side walls of the guide groove, and the slider on the upper edge of the first turntable belt 411 slides between the balls on both sides, and the second turntable belt 421 cooperates with the guide groove in the same way.

[0033] Similarly, the second air supply turntable 42 includes a second turntable belt 421, on which a plurality of second air supply plates 422 are evenly arranged at equal intervals. The second air supply plates 422 rotate with the second turntable belt 421. The second turntable belt 421 is also a waist-shaped conveyor belt structure. The second turntable belt 421 is also arranged between the two baffles 11. The baffles 11 are provided with another guide rail groove for the second turntable belt 421 to rotate. The second turntable belt 421 and the guide rail groove are movably connected via a ball structure.

[0034] It should be noted that, taking the first air supply turntable 41 as an example, the first air supply turntable 41 is a conveyor belt structure as a whole. In order to maintain the stability of its vertical rotation, a number of hard rods and other structures are arranged in its flexible conveyor belt, which can not only play a supporting role, but also can be used to install the hard first air supply plate 412. At the same time, the clamping of the guide rail groove on the first turntable belt 411 can not only provide a moving track, but also maintain the tension of the first turntable belt 411, so that the first air supply plate 412 is always perpendicular to the first turntable belt 411 or the tangent direction of the first turntable belt 411; the side end of the first turntable belt 411 located in the guide rail groove is provided with a groove compatible with the ball in the guide rail groove.

[0035] The first air supply turntable 41 and the second air supply turntable 42 are arranged side by side between the two baffles 11. In this embodiment, the straight parts of the first turntable belt 411 and the second turntable belt 421 are parallel to each other, the size of the first air supply plate 412 is the same as the size of the second air supply plate 422, and the spacing between the adjacent parts of the first turntable belt 411 and the second turntable belt 421 is equal to the width of the first air supply plate 412 or the second air supply plate 422, and the spacing between the upper and lower baffles 11 of the first air supply turntable 41 and the second air supply turntable 42 is equal to the height of the first air supply plate 412 or the second air supply plate 422. The first air supply plate 412 and the second air supply plate 422 between the adjacent first turntable belt 411 and the second turntable belt 421 are staggered front and back, and one of the first air supply plates 412 is located in the middle of the two adjacent second air supply plates 422. Similarly, the second air supply plate 422 is located in the middle of the two adjacent first air supply plates 412. The cavity formed by the adjacent first air supply plate 412 and the second air supply plate 422, the adjacent first turntable belt 411 and the second turntable belt 421, and the upper and lower baffles 11 is a compressed air cavity 45. In this embodiment, there are multiple compressed air cavities 45 formed and each compressed air cavity 45 is the same size. Preferably, a sealing gasket is provided at one end of the first air supply plate 412 away from the first turntable belt 411 and one end of the second air supply plate 422 away from the second turntable belt 421. When the first air supply plate 412 is in contact with the surface of the second turntable belt 421 and the second air supply plate 422 is in contact with the surface of the first turntable belt 411, good sealing is provided.

[0036] The air outlet channel 44 is provided on one of the compressed air chambers 45, one end of the air outlet channel 44 is connected to the compressed air chamber 45, and the other end is connected to the outside through a jet port 441. There are a plurality of jet ports 441, which are arranged along the front edge of the shark fin body 1, and the jet ports 441 are close to the outer wall surface of the shark fin body 1. The air outlet channel 44 gradually narrows from the air inlet chamber to the jet port 441, so as to increase the flow rate of the gas.

[0037] The first air supply plate 412 and the second air supply plate 422 are located in a chamber formed by the upper and lower baffles 11, the side walls surrounding the outer edges of the first air supply turntable 41 and the second air supply turntable 42, and the walls of the first turntable belt 411 and the second turntable belt 421, and the chamber is provided with two groups of air intake channels 43 connected to the outside, one group of air intake channels 43 is opposite to the first air supply plate 412 away from the second turntable belt 421, and the other group of air intake channels 43 is opposite to the second air supply plate 422 away from the first turntable belt 411, and the air inlet 431 of each air intake channel 43 is arranged on the windward surface of the shark fin body 1, and the windward surface refers to the surface facing the direction of travel of the car; preferably, the opening size of the air intake channel 43 is the same as the size of the first air supply plate 412 and the second air supply plate 422.

[0038] Usage of the present invention: Taking the active drag-reducing shark fin antenna described in this embodiment as an example, a through hole connecting the antenna cavity 2 can be set in the center of the first turntable belt 411 and the second turntable belt 421 to allow the wiring harness connecting the antenna module in the antenna cavity 2 to pass through. The shark fin body 1 is installed at a corresponding position on the roof of the car, and its windward side with an air inlet faces the front of the car; during the driving of the car, the airflow blows directly from each of the air inlets along the air inlet channel to the first air supply plate 412 and the second air supply plate 422, so that the first air supply plate 412 and the second air supply plate 422 respectively drive the first turntable belt 411 and the second turntable belt 421 to rotate along their respective guide grooves under the impact of the airflow, wherein the rotation directions of the first air supply turntable 41 and the second air supply turntable 42 are opposite, and the first air supply plate 412 and the second air supply plate 422 that constitute the air pressure chamber 45 move in the same direction against the direction of the airflow; taking the first air supply turntable 41 as an example, the gas between the adjacent first air supply plates 412 opposite to the air inlet channel 43 is transferred to the adjacent first turntables Between the disc belt 411 and the second disc belt 421, wherein, since the first air supply plate 412 and the second air supply plate 422 on both sides simultaneously transfer the same volume of gas to the adjacent first disc belt 411 and the second disc belt 421, and the first air supply plate 412 and the second air supply plate 422 are arranged front to back in an alternating manner, the two volumes of gas brought are compressed in one volume and continue to move forward under the squeezing of the first air supply plate 412 and the second air supply plate 422. When it moves to be connected with the air outlet channel 44, the compressed gas in the air compression chamber 45 is released into the air outlet channel 44, and is gradually accelerated along the gradually narrowing channel until it is ejected from the jet port 441. The jet direction is controlled by the setting direction of the jet port 441 and can be designed according to the actual resistance reduction requirements.

[0039] The active drag-reducing shark fin antenna of the present invention constructs a continuous gas source channel by utilizing external airflow; the gas is transported and compressed by using the first air supply turntable 41 and the second air supply turntable 42 arranged in parallel, and then discharged at high speed through the air outlet channel 44 and the air jet 441, so as to reduce the drag of the car by using the injected gas, and there is no need to install a pressure air pump on the car, which greatly reduces the maintenance cost; the airflow carried by the first air supply plate 412 and the second air supply plate 422 flows through the interior of the shark fin body 1, which can take away the heat generated by components such as the internal antenna, and assists the heat dissipation of the components to a certain extent; at the same time, because the air outlet channel 44 passes through the antenna cavity 2, the heat of the gas that has absorbed the heat will not affect the antenna module again Block, the baffle 11 directly above the pressure chamber 45 and the wall surface constituting the air outlet channel 44 are wrapped with heat insulation material, wherein, the baffle 11 on the air flow channel before the gas enters the compressed air chamber 45 is not provided with heat insulation material, so that the heat generated by the antenna module will be brought into the compressed air chamber 45 by the air flow, and further, the compressed air will also generate corresponding heat, so that the temperature of the ejected gas is further increased. In some preferred embodiments, components such as heating wires (not shown in the figure) can be added to the air outlet channel 44 to further heat the gas to be ejected, so that when the external ambient temperature is low, the surface of the shark fin antenna body 1 can be dried and de-iced through the air jet 441, and at the same time, the wind cooling effect caused by high-speed driving can be alleviated to prevent icing.

[0040] It should be noted that: in this embodiment, the jet device 4 is arranged on the entire bottom of the shark fin body 1, while in some preferred embodiments, the first air supply turntable 41 and the second air supply turntable 42 only cover a part of the bottom of the shark fin body 1, that is, the length of the first air supply turntable 41 and the second air supply turntable 42 is relatively reduced, the number of the compressed air chambers 45 is reduced, and the formation of the jet is not affected.

[0041] Preferably, the jet outlet 441 can be set according to actual needs. For example, setting the jet outlet 441 at the leading edge of the shark fin body 1 can reduce the positive pressure area, smooth the airflow streamline, and reduce the separation effect after the airflow bypasses the antenna; setting the jet outlet 441 at the trailing edge of the shark fin body 1 can redirect the tail airflow, merge it with the main airflow, and reduce the formation of tail vortex.

[0042] In some embodiments, an active drive method can also be used to increase the gas injection effect, such as setting a gear roller with a toothed disk on the inner wall of the semicircular end of the first turntable belt 411 and the second turntable belt 421, and then directly driving it by a motor, which is equivalent to a rotating belt driven by a motor to drive the rotation of the first air delivery plate 412 and the second air delivery plate 422 to achieve a pressurization effect.

[0043] In this embodiment, the volumes of the compressed air chambers 45 are the same, which is beneficial to the stability of the air pressure input to the air outlet channel 44. In some embodiments, the volumes of the compressed air chambers 45 formed by the first air supply plate 412 and the second air supply plate 422 between the adjacent first turntable belt 411 and the second turntable belt 421 may not be equal, which does not affect the realization of the final jet effect.

[0044] The above is only a preferred embodiment of the present invention. It should be pointed out that ordinary technicians in this technical field can make several improvements and supplements without departing from the principle of the present invention. These improvements and supplements should also be regarded as the scope of protection of the present invention.

Claims

1. An active drag-reducing shark fin antenna, characterized in that: It comprises a shark fin body, wherein the shark fin body is provided with an antenna cavity and a power cavity, and the power cavity is provided with an injection device; the injection device comprises a first air supply turntable, a second air supply turntable, an air inlet channel, and an air outlet channel; the first air supply turntable comprises a first turntable belt, and a plurality of first air supply plates are evenly spaced on the first turntable belt, and the second air supply turntable comprises a second turntable belt, and a plurality of second air supply plates are evenly spaced on the second turntable belt, wherein the first air supply plate and the second air supply plate have the same size, and the first air supply turntable and the second air supply turntable are arranged in parallel; on the adjacent first turntable belt and the second turntable belt, the end of the first air supply plate is fitted with the second turntable belt, and the end of the second air supply plate is fitted with the first turntable belt, and the adjacent first air supply plates and the second air supply plates are staggered front and back to form an air pressure cavity; the air outlet channel is connected with the air pressure cavity, and one end of the air outlet channel is the air injection port on the shark fin body; the first air supply turntable and the second air supply turntable are respectively connected with the air inlet channel.

2. The active drag-reducing shark fin antenna according to claim 1, characterized in that: The air inlet of the air inlet channel is arranged on the windward surface of the shark fin body.

3. The active drag-reducing shark fin antenna according to claim 2, characterized in that: The air inlet channel connected to the first air supply turntable faces the first air supply plate far away from the second air supply turntable; the air inlet channel connected to the second air supply turntable faces the second air supply plate far away from the first air supply turntable.

4. The active drag-reducing shark fin antenna according to claim 1, characterized in that: The distances between the first air supply plates and the second air supply plates staggered front and back are equal, so that the sizes of the air pressure cavities are equal.

5. The active drag-reducing shark fin antenna according to claim 1, characterized in that: The air jet is arranged at the front edge of the shark fin antenna.

6. The active drag-reducing shark fin antenna according to claim 1, characterized in that: One end of the first air supply plate away from the first turntable belt and one end of the second air supply plate away from the second turntable belt are both provided with sealing gaskets.

7. The active drag-reducing shark fin antenna according to claim 1, characterized in that: The air outlet passage contracts from the air pressure chamber toward the air jet port.

8. The active drag-reducing shark fin antenna according to claim 1, characterized in that: The first air supply turntable and the second air supply turntable are provided with a driving mechanism for driving them to rotate synchronously.

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