Multi-service vehicle-mounted low-wind-resistance antenna for high-speed train

Abstract

The invention relates to the technical field of vehicle-mounted antennas, in particular to a high-speed train multi-service vehicle-mounted low-wind-resistance antenna which comprises a base, a signal unit installed on the base and a housing. The housing comprises a windward side formed at the front end and a leeward side formed at the rear end, transition surfaces are further formed on the two sides of the housing, and smooth transition parts are formed on the surfaces of the transition surfaces and the leeward side; according to the invention, through the designed streamlined antenna structure, the aerodynamic shape of the antenna is further optimized on the basis of an original antenna model, and the resistance reduction effect is obvious under the designed wind speed, so that the problem that the current antenna cannot continuously meet the overall wind resistance requirement of a high-speed train is solved; and meanwhile, a heat dissipation structure is designed for the antenna, so that the heat dissipation of internal components of the whole antenna can be realized while the wind resistance of the whole antenna is reduced, and the working stability is further ensured.

Description

Technical Field

[0001] The invention relates to the technical field of vehicle-mounted antennas, and in particular to a high-speed train multi-service vehicle-mounted low wind resistance antenna. Background Art

[0002] With the launch of new high-speed trains in my country, the demand for train-to-ground communications is growing. The number and layout of high-speed train roof antennas need to be optimized according to the characteristics of the new high-speed EMUs. Especially when the train speed increases, wind resistance has gradually become the main factor affecting driving efficiency. As part of the train, the onboard antenna has a certain impact on the flow around the roof of the EMU, thereby increasing the resistance of the train.

[0003] At present, the models and types of on-board antennas in service cannot meet the overall wind resistance requirements when used on new high-speed trains. In particular, the CR400 antenna model produces a large wind resistance at a design wind speed of 500Km / h. The size of this antenna model is 350mm*100mm*158mm, and its front and rear ends are symmetrical, with the antenna cover wall and antenna base facing the incoming flow. However, the groove structure on both sides of the middle has a great impact on the overall flow, resulting in a poor aerodynamic shape and large wind resistance, which cannot meet the overall drag reduction requirements of high-speed trains.

[0004] The main problem with the CR400 antenna model is the poor aerodynamic shape at both ends and the design of the grooves on both sides, which increase the wind resistance of the antenna.

[0005] Therefore, a new type of low wind resistance antenna design is urgently needed to meet the engineering requirements of high-speed trains in terms of drag reduction. Summary of the invention

[0006] The purpose of the present invention is to solve the shortcomings of the prior art, such as poor aerodynamic shape at both ends and the design of grooves on both sides, which lead to increased wind resistance of the antenna, and to propose a high-speed train multi-service onboard low wind resistance antenna.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] Design a high-speed train multi-service vehicle-mounted low wind resistance antenna, including:

[0009] A base, a signal unit mounted on the base, and a cover;

[0010] The cover shell includes a windward surface formed at the front end and a leeward surface formed at the rear end, transition surfaces are formed on both sides of the cover shell, and the surfaces of the transition surface and the leeward surface are both formed with smooth transition portions;

[0011] A wind-breaking ridge is formed between the tops of the two transition surfaces, and the wind-breaking ridge extends along the windward surface to the leeward surface.

[0012] Furthermore, the base and the cover are connected via fasteners, and mounting portions are formed on both sides of the base;

[0013] Wherein, the front end of the base has a base windward surface.

[0014] Furthermore, the windward surface of the base includes two inclined surfaces, which are symmetrically distributed along the center line of the base and form a pointed mouth;

[0015] An air guide portion which transitionally matches with the windward surface is also formed above the pointed mouth portion.

[0016] Furthermore, an air guide structure is formed on the surface of the transition surface.

[0017] Further, the wind guide structure includes ribs formed on the smooth transition portion;

[0018] Two ribs are horizontally arranged on the smooth transition portion on each side, and the line shape of the rib is an arc curve with a low middle part and high ends.

[0019] Further, the air guide structure is an air guide cover;

[0020] The air guide cover is sleeved on the outer side of the housing and forms an air guide space with the outer wall of the housing. The front end of the air guide cover is located at the smooth transition portion.

[0021] Furthermore, the windward surface of the base includes two inclined surfaces, and the two inclined surfaces are distributed on the base in an eight-shaped structure, wherein the two inclined surfaces are transitionally matched with the windward surface.

[0022] Furthermore, a heat dissipation structure is formed between the base and the cover.

[0023] Furthermore, the heat dissipation structure includes a heat dissipation hole formed in the middle of the leeward surface, the heat dissipation hole is connected to the inner side of the housing, and is used to conduct heat from the signal unit;

[0024] An air inlet is formed on the rear end side of the base. The air inlet is L-shaped and extends along the back end of the base to its upper surface. A circulating air duct is formed between the air inlet and the heat dissipation holes. A spoiler is also fixedly installed on the inner side of the cover shell.

[0025] Furthermore, two inwardly contracted inclined surfaces are formed on both sides of the rear end of the base, and the two inwardly contracted inclined surfaces are in an eight-shaped structure, and the inwardly contracted inclined surfaces are connected and transitioned to the leeward surface.

[0026] The invention proposes a high-speed train multi-service on-board low wind resistance antenna, which has the following beneficial effects: the streamlined antenna structure designed in the invention further optimizes its aerodynamic shape based on the original antenna model, and has an obvious drag reduction effect under the design wind speed, thereby solving the problem that the current antenna can no longer meet the overall wind resistance requirements of the high-speed train. At the same time, the invention also designs a heat dissipation structure for the antenna, thereby ensuring that the entire antenna reduces wind resistance while also achieving heat dissipation of the entire antenna's internal components to further ensure working stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the antenna structure of the prior art;

[0028] Figure 2 This is a schematic diagram of the structure of Embodiment 1 of the present invention;

[0029] Figure 3 This is a schematic diagram of the structure of Embodiment 2 of the present invention;

[0030] Figure 4 This is a schematic diagram of the structure of Embodiment 3 of the present invention;

[0031] Figure 5 is a cross-sectional view of the cover of the present invention;

[0032] Figure 6 It is a schematic diagram of the heat dissipation structure of the present invention.

[0033] In the figure: 1. base; 11. mounting portion; 12. windward side of base; 121. inclined surface; 122. pointed mouth portion; 123. wind guiding portion; 13. inwardly contracted inclined surface; 2. cover shell; 21. windward side; 22. leeward side; 23. transition surface; 24. smooth transition portion; 25. wind-breaking ridge; 26. wind guiding structure; 3. heat dissipation structure; 31. heat dissipation holes; 32. air inlet duct; 33. spoiler. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0035] Embodiment 1

[0036] Reference Figure 2An embodiment of the present invention discloses a high-speed train multi-service vehicle-mounted low wind resistance antenna, which is used to further reduce wind resistance to meet the overall drag reduction requirements of high-speed trains. Specifically, the antenna includes a base 1, a signal unit installed on the base 1, and a cover 2. The base 1 is used to be fixed on the train. Secondly, the signal unit includes components such as an antenna, a positioning module, and a transceiver module. Its specific structure is a prior art and will not be described in detail here.

[0037] The housing 2 includes a windward surface 21 formed at the front end and a leeward surface 22 formed at the rear end. Transition surfaces 23 are formed on both sides of the housing 2. The transition surface 23 and the leeward surface 22 are both formed with smooth transition portions 24.

[0038] A wind-breaking ridge 25 is formed between the tops of the two transition surfaces 23 , and the wind-breaking ridge 25 extends along the windward surface 21 to the leeward surface 22 .

[0039] In some embodiments, the base 1 and the cover 2 are connected by fasteners, and mounting portions 11 are formed on both sides of the base 1, the mounting portions 11 form an installation space, and mounting holes are formed on the end faces of the mounting portions 11. When connected, the antenna can be fixed to the train through the above-mentioned connection holes. In addition, the fasteners described in the present invention are preferably bolts;

[0040] The front end of the base 1 has a base windward surface 12 , that is, the present invention provides a base windward surface 12 on the end surface of the base 1 , which can be used to reduce the wind resistance of the base 1 to improve the overall drag reduction performance.

[0041] Preferably, the windward surface 12 of the base in this embodiment includes two inclined surfaces 121, which are symmetrically distributed along the center line of the base 1 and form a pointed mouth 122. Of course, the inclined surface 121 in this embodiment is set as a curved surface structure;

[0042] An air guiding portion 123 is formed above the pointed mouth portion 122 and is transitionally matched with the windward surface 21 .

[0043] During specific operation, the airflow breaks through the wind along the pointed mouth 122 and the windward surface 21, and then flows out along the leeward surface 22 through the smooth transition portion 24 on the transition surface 23. Due to the streamlined design of the smooth transition portion 24, the smoothness of the high-speed passage of the airflow can be ensured, thereby greatly reducing the overall wind resistance of the antenna when the train is running at high speed.

[0044] Specifically, in this embodiment, the antenna length is increased on the basis of the original antenna to reduce the front end slope. At the same time, the windward surface 21 of the front end is designed as a pointed structure, and the two side surfaces of the cover 2 and the leeward surface 22 are smoothly transitioned. Compared with the original antenna structure, the front end of the antenna has a good streamlined structure. At the design wind speed, the forward wind resistance is 8.11N, and the reverse wind resistance is 8.82N, which is about 76% less than the same period last year.

[0045] Reference Figure 2 , Figure 5 , Figure 6 On the basis of the above-mentioned embodiment, a heat dissipation structure 3 is further formed between the base 1 and the cover shell 2 in the present invention.

[0046] Preferably, the heat dissipation structure 3 in this embodiment includes a heat dissipation hole 31 formed in the middle of the leeward surface 22, and a plurality of the heat dissipation holes 31 may be arranged along a straight line along the middle of the leeward surface 22, and the direction of the straight line is the height direction of the housing 2, and the heat dissipation holes 31 are connected to the inner side of the housing 2, and are used to export the heat of the signal unit;

[0047] An air inlet 32 ​​is formed on the rear end side of the base 1. The air inlet 32 ​​is L-shaped and extends along the back end of the base 1 to its upper surface. A circulating air duct is formed between the air inlet 32 ​​and the heat dissipation holes 31. A spoiler 33 is also fixedly installed on the inner side of the cover shell 2. Specifically, the spoiler 33 is tilted and is used to convert the vertical upward airflow of the air inlet 32 ​​into a horizontal airflow to ensure sufficient contact with internal components. Thereafter, due to the negative pressure of the heat dissipation holes 31, the airflow is discharged laterally from the inner side of the cover shell 2 to achieve cooling of the components.

[0048] In addition, in the present invention, two inwardly contracted inclined surfaces 13 are formed on both sides of the rear end of the base 1 . The two inwardly contracted inclined surfaces 13 are in an eight-shaped structure, and the inwardly contracted inclined surfaces 13 are connected and transitioned with the leeward surface 22 .

[0049] Specifically, in the present invention, the design of the retracted slope 13 is adopted to ensure that the high-speed airflow can be guided and merged after flowing out through the leeward surface 22, which can greatly improve the working stability of the entire antenna. Secondly, due to the subsequent merging of the airflow, the wind resistance of the entire antenna when running at high speed is also reduced.

[0050] Furthermore, it should be noted that, in the embodiment of the present invention, the air inlet duct 32 is arranged on the side of the inwardly contracted inclined surface 13, and its purpose is to reduce the influence of the airflow on the air intake.

[0051] Specifically, when the entire antenna is running, the signal unit on the base 1 will generate heat. When the train runs at high speed, high-speed airflow will flow through the surface of the cover 2. When the airflow flows along the transition portion 23 on the side of the cover 2 and merges to the leeward side 22, the airflow will form a negative pressure area on the leeward side 22. Therefore, through the design of the negative pressure area, the heat inside the entire cover 2 will be brought out through the heat dissipation holes 31, thereby achieving heat reduction inside the cover 2 to ensure the stability of the operation of the internal signal unit.

[0052] Of course, since the air inlet duct 32 is designed on the bottom of the base 1, the negative pressure effect is relatively small. Therefore, after the above-mentioned negative pressure area takes out the heat from the heat dissipation hole 31, the external airflow will enter the inner side of the cover shell 2 along the air inlet duct 32, and so on to achieve heat dissipation inside the cover shell 2.

[0053] The design of the heat dissipation structure 3 does not increase the wind resistance of the entire antenna, and thus does not interfere with the working stability of the antenna.

[0054] Embodiment 2

[0055] Reference Figure 3 , Figure 6 Specifically, the similarities between this embodiment and embodiment 1 are not repeated here, and the difference lies in that: in this embodiment, the windward surface 12 of the base includes two inclined surfaces 121, and the two inclined surfaces 121 are distributed on the base 1 in an eight-shaped structure, wherein the two inclined surfaces 121 transitionally cooperate with the windward surface 21, and preferably, the inclined surface 121 described in this embodiment is set as an arc surface.

[0056] Specifically, in this embodiment, two inclined surfaces 121 with an "eight-shaped" structure are formed on the base 12 to achieve wind breaking, so as to cooperate with the windward surface 21 to reduce wind resistance.

[0057] In some embodiments, a wind guide structure 26 is formed on the surface of the transition surface 23 of the present invention, and the wind guide structure 26 is provided to guide and accelerate the gas on the separated flows on both sides.

[0058] On the basis of the above-mentioned embodiment, the wind guide structure 26 in the embodiment of the present invention includes ribs formed on the smooth transition portion 24;

[0059] Two ribs are horizontally arranged on the smooth transition portion 24 on each side, and the line shape of the ribs is an arc curve with a low middle portion and high ends.

[0060] Specifically, in this embodiment, the height of the antenna cover is lowered on the original basis. Due to the limited space inside the antenna vibrator, the front and rear shapes are asymmetric structures, and smooth transition treatments are performed on the surfaces of both sides of the cover 2 and the windward side 12 and leeward side 22 of the base. Furthermore, rib knots are added to the surfaces of both sides of the antenna to respectively guide and accelerate the gas on the separated flows on both sides.

[0061] Specifically, in this embodiment, two rib structures are added at the same time after the surfaces on both sides of the original model are changed into streamlined structures. The front and rear ends of the ribs are located in the flow separation areas on the front and rear sides of the antenna. The overall line shape presents an arc curve with "low in the middle and high at both ends". At the design wind speed, the forward wind resistance is 8.13N and the reverse wind resistance is 9.12N, which is a year-on-year drag reduction of about 75.3%.

[0062] Embodiment 3

[0063] Reference Figure 4 In this embodiment, the same points as those in the first and second embodiments are not described in detail, and the difference is that: in this embodiment, the air guide structure 26 is an air guide cover;

[0064] The air guide cover is sleeved on the outer side of the housing 2 and forms an air guide space with the outer wall of the housing 2 . The front end of the air guide cover is located at the smooth transition portion 24 .

[0065] Specifically, the wind guide cover described in this embodiment is connected to the main structure through the bottom joint, and the rest of the parts are hollowed out. The front and rear end openings of the wind guide cover are roughly located in the separation area of ​​the main antenna flow. Under the design wind speed, the forward wind resistance of this type of antenna is 14.93N, and the reverse wind resistance is 16.10N, which is a year-on-year drag reduction of about 57%.

[0066] In summary, the streamlined antenna structure designed in the present invention further optimizes its aerodynamic shape based on the original antenna model, and has a significant drag reduction effect under the designed wind speed, thus solving the problem that the current antenna can no longer meet the overall wind resistance requirements of high-speed trains. At the same time, the present invention also designs a heat dissipation structure 3 for the antenna, so that while ensuring that the entire antenna reduces wind resistance, it can also achieve heat dissipation for the internal components of the entire antenna to further ensure the stability of the operation.

[0067] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

[0068] Further, the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0069] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

Claims

1. A high-speed train multi-service vehicle-mounted low wind resistance antenna, characterized in that: include: A base (1), a signal unit mounted on the base (1), and a cover (2); The cover shell (2) comprises a windward surface (21) formed at the front end and a leeward surface (22) formed at the rear end, transition surfaces (23) are also formed on both sides of the cover shell (2), and smooth transition portions (24) are formed on the surfaces of the transition surface (23) and the leeward surface (22); A wind-breaking ridge (25) is formed between the tops of the two transition surfaces (23), and the wind-breaking ridge (25) extends along the windward surface (21) to the leeward surface (22).

2. A high-speed train multi-service onboard low wind resistance antenna according to claim 1, characterized in that: The base (1) and the cover shell (2) are connected via fasteners, and mounting portions (11) are formed on both sides of the base (1); Wherein, the front end of the base (1) has a base windward surface (12).

3. A high-speed train multi-service vehicle-mounted low wind resistance antenna according to claim 2, characterized in that: The windward surface (12) of the base comprises two inclined surfaces (121), the two inclined surfaces (121) are symmetrically distributed along the center line of the base (1) and form a pointed mouth (122); An air guide portion (123) is also formed above the pointed mouth portion (122) and is transitionally matched with the windward surface (21).

4. The high-speed train multi-service onboard low wind resistance antenna according to claim 2, characterized in that: An air guide structure (26) is also formed on the surface of the transition surface (23).

5. The high-speed train multi-service vehicle-mounted low wind resistance antenna according to claim 4, characterized in that: The wind guide structure (26) comprises ribs formed on the smooth transition portion (24); Two ribs are horizontally arranged on the smooth transition portion (24) on each side, and the line shape of the ribs is an arc curve with a low middle part and high ends.

6. The high-speed train multi-service vehicle-mounted low wind resistance antenna according to claim 4, characterized in that: The air guide structure (26) is an air guide cover; The air guide cover is sleeved on the outside of the housing (2) and is spaced apart from the outer wall of the housing (2) to form an air guide space, and the front end of the air guide cover is located at the smooth transition portion (24).

7. A high-speed train multi-service onboard low wind resistance antenna according to any one of claims 4 to 6, characterized in that: The windward surface (12) of the base comprises two inclined surfaces (121), and the two inclined surfaces (121) are distributed on the base (1) in an eight-shaped structure, wherein the two inclined surfaces (121) are transitionally matched with the windward surface (21).

8. The high-speed train multi-service onboard low wind resistance antenna according to claim 1, characterized in that: A heat dissipation structure (3) is also formed between the base (1) and the cover shell (2).

9. A high-speed train multi-service onboard low wind resistance antenna according to claim 8, characterized in that: The heat dissipation structure (3) comprises a heat dissipation hole (31) formed in the middle of the leeward surface (22), wherein the heat dissipation hole (31) is connected to the inner side of the housing (2) and is used to dissipate heat from the signal unit; An air inlet duct (32) is formed on the rear end side of the base (1); the air inlet duct (32) is in an L-shaped structure and extends along the back end of the base (1) to its upper surface; a circulating air duct is formed between the air inlet duct (32) and the heat dissipation hole (31); and a spoiler (33) is also fixedly mounted on the inner side of the cover shell (2).

10. The high-speed train multi-service onboard low wind resistance antenna according to claim 1, characterized in that: Two inwardly contracted inclined surfaces (13) are formed on both sides of the rear end of the base (1), the two inwardly contracted inclined surfaces (13) are in an eight-shaped structure, and the inwardly contracted inclined surfaces (13) are connected and transitioned to the leeward surface (22).

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