Movable variable-size closed test section suitable for automobile wind tunnel

Abstract

The invention discloses a movable variable-size closed test section suitable for an automobile wind tunnel, belongs to the field of automobile wind tunnels, and aims to solve the problem that the requirements of automobile wind tunnel tests on the effective area of the test section are different. Comprising a movable frame, side wall plates, driving mechanisms and guiding mechanisms, the movable frame is of an n-shaped structure formed by connecting a top frame and two side frames, the two side wall plates are arranged between the two side frames, and the two side frames are each provided with two driving mechanisms and two guiding mechanisms; the driving mechanism comprises two lead screw lifters, the lead screw lifters are fixed to the side walls of the movable frame, and lifting lead screws of the lead screw lifters are arranged perpendicular to the side frames and connected with the side wall plates on the same sides. The driving motors can drive the lifting screw rods of the corresponding screw rod lifters to move axially, and then drive the two side wall plates to move close to or away from each other, so that the opening adjustment of the test section is realized, wind tunnel tests of automobiles or models of different sizes are adapted, the construction of wind tunnels of different specifications is reduced, and the cost is reduced.

Description

Technical Field

[0001] The invention belongs to the field of automobile wind tunnels, and in particular relates to a movable variable-size closed test section suitable for automobile wind tunnels. Background Art

[0002] An automotive wind tunnel is a large-scale test equipment that simulates the external environment in which a car is driving and tests the car's wind resistance, wind noise, thermal management, driving stability, etc. However, due to the limitations on the size of the automotive wind tunnel test section, it is very difficult to simulate all similar parameters at the same time in one wind tunnel.

[0003] The size of the automobile wind tunnel test section determines the size of the automobile or model that can be tested. In order to minimize the impact of the "blocking effect" and accurately simulate the actual situation of road vehicles in the free atmosphere, the effective area of ​​the test section is required to be as large as possible. However, tests in other fields or small automobile models require a smaller effective area of ​​the test section.

[0004] The automobile wind tunnel test section is large in size, high in manufacturing cost, and has a complicated use and replacement process. Designing a mobile variable-size closed test section can well solve the above technical problems. Summary of the invention

[0005] The purpose of the present invention is to provide a mobile variable-size closed test section suitable for an automobile wind tunnel, so as to solve the problem that automobile wind tunnel tests have different requirements for the effective area of ​​the test section. The technical solution adopted by the present invention is as follows: A movable variable-size closed test section suitable for an automobile wind tunnel comprises a movable frame, side wall plates, an upper wall plate, a driving mechanism and a guiding mechanism. The movable frame is a door-shaped structure formed by connecting a top frame and two side frames. Track wheels are respectively arranged at both ends of the bottom of the side frames. The movable frame moves along two tracks through four track wheels. The upper wall plate is fixed on the lower end surface of the top frame. Two side wall plates are arranged between the two side frames. Two sets of driving mechanisms and two sets of guiding mechanisms are arranged on each of the two side frames. The driving mechanism includes a driving motor, two transmission shafts and two screw lifts. The driving motor and the two screw lifts are fixed on the side wall of the movable frame. The two output ends of the driving motor are connected to the input ends of the two screw lifts one by one through the transmission shaft. The lifting screws of the screw lifts are arranged vertically on the side frame and connected to the side wall plate on the same side. The guide mechanism comprises a guide light rod and a guide sleeve, the guide sleeve is vertically fixed on the side frame, the guide light rod is connected to the side wall plate on the same side, and the guide light rod and the guide sleeve are slidably matched; A plurality of rollers are provided at the bottom of the side wall plate, the upper side edge of the side wall plate cooperates with the lower end surface of the upper wall plate, and the two side wall plates are supported and moved by the plurality of rollers; The driving motor can drive the lifting screw of the corresponding screw lift to move axially, and then drive the two side wall plates to move closer or away, so as to adjust the opening of the test section. The guide mechanism is used to provide guidance for the movement of the side wall plates.

[0006] Furthermore, a mounting groove is provided on the ground, and the track is arranged at the bottom of the mounting groove along the length direction of the mounting groove. Guide blocks are provided on both side walls of the mounting groove, and guide rods are provided on both sides of the track wheel. The guide rods are connected to the side frames. When the test section moves to the working position on the wind tunnel, the outer sides of the two guide rods are respectively opposed to the inner sides of the two guide blocks for limiting positions.

[0007] Furthermore, the roller is a resin roller.

[0008] Furthermore, the side wall plate includes a frame body and an acrylic plate, and the acrylic plate is fixed to the inner end surface of the frame body by special screws.

[0009] Furthermore, the frame is composed of a plurality of crisscrossed aluminum profiles connected by special screws and special connectors.

[0010] Furthermore, the upper wall plate has the same structure as the side wall plate.

[0011] Furthermore, the lifting screw of the screw lift is connected to the side wall plate through a first hinge, and the guide light rod is connected to the side wall plate through a second hinge. The first hinge of at least one set of driving mechanisms on the same side frame is a three-section universal joint coupling, and the second hinges of the two sets of guide mechanisms are both three-section universal joint couplings. When the extension lengths of the lifting screws of the two sets of driving mechanisms are inconsistent, a small angle of several degrees can be formed between the side wall plate and the corresponding side frame, so that the two side wall plates can form a diffusion angle, and the diffusion angle can be slightly adjusted.

[0012] Compared with the prior art, the present invention has the following beneficial effects: The driving motor can drive the corresponding screw lifter to move axially, and then drive the two side wall panels to move closer or away, so as to adjust the opening of the test section, which can solve the problem that the automobile wind tunnel test has different requirements for the effective area of ​​the test section, adapt to the wind tunnel test of cars or models of different sizes, reduce the construction of wind tunnels of different specifications, and reduce costs. The guide mechanism is used to provide guidance for the movement of the side wall panels. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a front view of the test section of the present invention; Figure 2 is a side view of a test section of the present invention; Figure 3 yes Figure 1 A magnified image of point A; Figure 4 yes Figure 1 A magnified view of point B; Figure 5 yes Figure 2 Enlarged view of point C; Figure 6 yes Figure 1 Enlarged view of point D.

[0014] In the figure, 1. movable frame, 2. side wall plate, 3. upper wall plate, 4. driving mechanism, 5. guiding mechanism, 6. track wheel, 7. guiding block, 8. guiding rod, 9. track, 10. screw lifter, 11. transmission shaft, 12. driving motor, 13. first hinge, 14. acrylic plate, 15. aluminum profile, 16. special screw, 17. special connecting piece, 18. roller, 19. second hinge, 20. guiding light rod, 21. guiding sleeve, 22. top frame, 23. side frame, 24. frame. DETAILED DESCRIPTION

[0015] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is described below by the specific embodiments shown in the accompanying drawings. However, it should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present invention.

[0016] The connection mentioned in the present invention is divided into fixed connection and detachable connection. The fixed connection is a non-detachable connection including but not limited to conventional fixed connection methods such as folding connection, rivet connection, bonding connection and welding connection. The detachable connection includes but not limited to conventional detachable methods such as bolt connection, snap connection, pin connection and hinge connection. When the specific connection method is not clearly defined, it is assumed that at least one connection method can be found in the existing connection methods to achieve the function, and those skilled in the art can choose according to their needs. For example: welding connection is selected for fixed connection, and bolt connection is selected for detachable connection.

[0017] The present invention will be further described in detail below in conjunction with the accompanying drawings. The following embodiments are provided to explain the present invention, but the present invention is not limited to the following embodiments.

[0018] Example: Figure 1 to Figure 6As shown, a movable variable-size closed test section suitable for an automobile wind tunnel, the test section is 5 meters high, 19 meters long, and has an adjustable width. The corresponding maximum wind speed varies with the effective area of ​​the test section, comprising a movable frame 1, side wall panels 2, an upper wall panel 3, a driving mechanism 4, and a guiding mechanism 5. The movable frame 1 is a gate-shaped structure formed by connecting a top frame 22 and two side frames 23. The movable frame 1 is welded from section steel and has a length of 19 meters. Track wheels 6 are respectively provided at both ends of the bottom of the side frames 23. The movable frame 1 moves along two parallel tracks 9 through four track wheels 6. The upper wall panel 3 is fixed to the lower end surface of the top frame 22 through a special connector. Two side wall panels 2 are provided between the two side frames 23. Two sets of driving mechanisms 4 and two sets of guiding mechanisms 5 are arranged on each of the two side frames 23. The driving mechanism 4 includes a driving motor 12, two transmission shafts 11 and two screw lifts 10. The driving motor 12 and the two screw lifts 10 are fixed on the side wall of the movable frame 1. The two output ends of the driving motor 12 are connected to the input ends of the two screw lifts 10 in a one-to-one correspondence through the transmission shaft 11. The lifting screws of the screw lifts 10 are arranged vertically on the side frame 23 and are connected to the side wall plate 2 on the same side. The guide mechanism 5 includes a guide light rod 20 and a guide sleeve 21. The guide sleeve 21 is vertically fixed on the side frame 23. The guide light rod 20 is connected to the side wall plate 2 on the same side. The guide light rod 20 and the guide sleeve 21 are slidably matched. A plurality of rollers 18 are provided at the bottom of each upright column of the side wall plate 2 , and the upper edge of the side wall plate 2 cooperates with the lower end surface of the upper wall plate 3 , and the two side wall plates 2 are supported and moved by the plurality of rollers 18 .

[0019] The driving motor 12 can drive the corresponding lifting screw of the screw lift 10 to move axially, and then drive the two side wall panels 2 to move closer or away, so as to achieve the opening adjustment of the test section from 5 meters to 7 meters. By adjusting the opening of the test section, the problem of different requirements for the effective area of ​​the test section in the automobile wind tunnel test can be solved, and the wind tunnel test of cars or models of different sizes can be adapted, reducing the construction of wind tunnels of different specifications and reducing costs. The guide mechanism 5 is used to provide guidance for the movement of the side wall panels 2.

[0020] A mounting groove is provided on the ground, and a track 9 is arranged at the bottom of the mounting groove along the length direction of the mounting groove. Guide blocks 7 are provided on both side walls of the mounting groove, and guide rods 8 are provided on both sides of the track wheel 6. The guide rods 8 are connected to the side frame 23. When the test section moves to the working position on the wind tunnel, the outer sides of the two guide rods 8 are respectively abutted against the inner sides of the two guide blocks 7 for limiting. This ensures that the test section does not deviate from the working position. The guide rods 8 are connected to both sides of the bottom of the side frame 23, and the rigidity of the movable frame 1 can be improved at the same time.

[0021] The roller 18 is a resin roller.

[0022] The side wall plate 2 includes a frame body 24 and an acrylic plate 14, and the acrylic plate 14 is fixed to the inner end surface of the frame body 24 by special screws 16. The acrylic plate 14 can be made into a solid wall, a slotted wall or a perforated wall according to test requirements.

[0023] The frame 24 is composed of a plurality of crisscross aluminum profiles 15 connected together by special screws 16 and special connectors 17 .

[0024] The upper wall plate 3 has the same structure as the side wall plate 2 .

[0025] The lifting screw of the screw lift 10 is connected to the side wall plate 2 through the first hinge 13, and the guide light rod 20 is connected to the side wall plate 2 through the second hinge 19. The first hinge 13 of at least one set of driving mechanisms 4 on the same side frame 23 is a three-section universal joint coupling, and the second hinges 19 of the two sets of guide mechanisms 5 are both three-section universal joint couplings. When the extension lengths of the lifting screws of the two sets of driving mechanisms 4 are inconsistent, a small angle of several degrees can be formed between the side wall plate 2 and the corresponding side frame 23, so that the two side wall plates 2 can form a diffusion angle, and the diffusion angle can be slightly adjusted.

[0026] The above embodiments are merely exemplary descriptions of the present invention and do not limit its protection scope. Those skilled in the art may also make partial changes thereto, which are within the protection scope of the present invention as long as they do not exceed the spirit of the present invention.

Claims

1. A mobile variable-size closed test section suitable for an automobile wind tunnel, characterized in that: The movable frame (1) comprises a movable frame (1), a side wall plate (2), an upper wall plate (3), a driving mechanism (4) and a guiding mechanism (5); the movable frame (1) is a door-shaped structure formed by connecting a top frame (22) and two side frames (23); track wheels (6) are respectively provided at both ends of the bottom of the side frames (23); the movable frame (1) moves along two tracks (9) via the four track wheels (6); the upper wall plate (3) is fixed on the lower end surface of the top frame (22); two side wall plates (2) are provided between the two side frames (23); and two sets of driving mechanisms (4) and two sets of guiding mechanisms (5) are respectively arranged on the two side frames (23); The driving mechanism (4) comprises a driving motor (12), two transmission shafts (11) and two screw lifts (10); the driving motor (12) and the two screw lifts (10) are fixed on the side wall of the movable frame (1); the two output ends of the driving motor (12) are connected to the input ends of the two screw lifts (10) in a one-to-one correspondence via the transmission shafts (11); the lifting screws of the screw lifts (10) are arranged vertically on the side frame (23) and are connected to the side wall plate (2) on the same side; The guide mechanism (5) comprises a guide light rod (20) and a guide sleeve (21), wherein the guide sleeve (21) is vertically fixed on the side frame (23), the guide light rod (20) is connected to the side wall plate (2) on the same side, and the guide light rod (20) and the guide sleeve (21) are slidably matched; A plurality of rollers (18) are provided at the bottom of the side wall plate (2), the upper edge of the side wall plate (2) cooperates with the lower end surface of the upper wall plate (3), and the two side wall plates (2) are supported and moved by the plurality of rollers (18); The driving motor (12) can drive the lifting screw of the corresponding screw lift (10) to move axially, thereby driving the two side wall plates (2) to move closer or farther away, thereby achieving the opening adjustment of the test section, and the guide mechanism (5) is used to provide guidance for the movement of the side wall plates (2).

2. The movable variable-size closed test section suitable for an automobile wind tunnel according to claim 1, characterized in that: A mounting groove is provided on the ground, a track (9) is arranged at the bottom of the mounting groove along the length direction of the mounting groove, guide blocks (7) are provided on both side walls of the mounting groove, guide rods (8) are provided on both sides of the track wheel (6), and the guide rods (8) are connected to the side frame (23). When the test section moves to the working position on the wind tunnel, the outer sides of the two guide rods (8) are respectively abutted against the inner sides of the two guide blocks (7) for limiting position.

3. The movable variable-size closed test section suitable for an automobile wind tunnel according to claim 1, characterized in that: The roller (18) is a resin roller.

4. The movable variable-size closed test section suitable for an automobile wind tunnel according to claim 1, characterized in that: The side wall plate (2) comprises a frame body (24) and an acrylic plate (14), wherein the acrylic plate (14) is fixed to the inner end surface of the frame body (24) by means of special screws (16).

5. The movable variable-size closed test section suitable for an automobile wind tunnel according to claim 4, characterized in that: The frame (24) is composed of a plurality of crisscross aluminum profiles (15) connected together by special screws (16) and special connecting pieces (17).

6. The movable variable-size closed test section suitable for an automobile wind tunnel according to claim 5, characterized in that: The upper wall plate (3) has the same structure as the side wall plate (2).

7. A movable variable-size closed test section suitable for an automobile wind tunnel according to any one of claims 1 to 6, characterized in that: The lifting screw of the screw lift (10) is connected to the side wall plate (2) via a first hinge (13), the guide light rod (20) is connected to the side wall plate (2) via a second hinge (19), the first hinge (13) of at least one set of driving mechanisms (4) on the same side frame (23) is a three-section universal joint coupling, and the second hinges (19) of the two sets of guide mechanisms (5) are both three-section universal joint couplings. When the extension lengths of the lifting screws of the two sets of driving mechanisms (4) are inconsistent, a small angle of several degrees can be formed between the side wall plate (2) and the corresponding side frame (23), so that the two side wall plates (2) can form a diffusion angle, and the diffusion angle can be slightly adjusted.

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