Bernoulli visualization demonstration device

Abstract

The present application relates to the technical field of scientific demonstration, in particular to a Bernoulli visual demonstration device, which comprises a wing arranged horizontally in normal state and a fan arranged beside one end of the wing, the inside of the wing is provided with airflow channels vertically distributed, the airflow channels can be seen through from the outside of the wing, and the airflow channels are communicated with the top surface and the bottom surface of the wing, the inner cavities of the airflow channels are provided with light small balls which can make ascending movement under the action of pressure difference between the top surface and the bottom surface of the wing, and the Bernoulli visual demonstration device can intuitively show the generation of the lift of the wing without moving the whole wing upward during the demonstration process, and effectively reduces the requirement for the blowing range of the fan in the large Bernoulli principle demonstration device.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of scientific demonstration, and particularly relates to a Bernoulli visual demonstration device. BACKGROUND

[0002] The Bernoulli principle is a basic principle in fluid mechanics, and its essence is the mechanical energy conservation of ideal fluid. The most famous inference is that when the flow is isohypse, the greater the flow rate, the smaller the pressure.

[0003] The Bernoulli principle demonstration device is commonly used for teaching or science and technology exhibition popularization. As recorded in the text of a Bernoulli principle demonstration device with publication number CN215007135U, the wing is arranged to slide and rotate on the base. When the high-speed airflow passes through the upper and lower surfaces of the wing, the wing is rotated to a certain angle, which causes the flow rate difference between the upper and lower surfaces of the wing, thereby pushing the wing to slide on the base, and more directly demonstrating the generation process of the lift. In the demonstration process, the generation of lift is shown by the movement of the wing. This requires that the high-speed airflow completely covers the moving stroke of the wing in the whole lifting process. This structure is suitable for small teaching demonstration devices, but when used for large demonstration devices, the requirement for the blowing range of the fan is too large, and a large Bernoulli principle demonstration device cannot be formed, so it is urgent to be solved. SUMMARY

[0004] In order to avoid and overcome the technical problems existing in the prior art, the present application provides a Bernoulli visual demonstration device, which can directly show the generation of wing lift without the whole lifting movement of the wing, and effectively reduces the requirement for the blowing range of the fan in the large Bernoulli principle demonstration device.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical scheme:

[0006] A Bernoulli visual demonstration device, comprising a wing arranged horizontally in a normal state and a fan arranged beside one end of the wing, an airflow channel vertically distributed is arranged in the interior of the wing, the airflow channel is visible from the outside of the wing, and the airflow channel is in communication with the top surface and the bottom surface of the wing, a light small ball is arranged in the inner cavity of the airflow channel, and the light small ball can move upward under the action of the pressure difference between the top surface and the bottom surface of the wing.

[0007] As a further scheme of the present application, the wing comprises an upper top plate and a lower bottom plate, the upper top plate is an elastic steel plate, a hollow chamber is arranged between the upper top plate and the lower bottom plate, a transparent tube fixed to the lower bottom plate and vertically distributed is arranged in the hollow chamber, a transparent sleeve is slidably arranged on the transparent tube, the transparent sleeve and the inner cavity of the transparent tube jointly form the airflow channel, the transparent sleeve is driven to lift by an electric cylinder, and the elastic deformation of the upper top plate can be pushed.

[0008] As a further scheme of the present application, the top of the transparent sleeve is fixed with a push head, the push head is fixed with the upper top plate, and the top surface of the push head is arc-shaped to be attached to the bottom surface of the upper top plate after the elastic deformation of the upper top plate.

[0009] As a further scheme of the present application, the outer periphery of the upper top plate and the lower bottom plate is wrapped with a silica gel cloth.

[0010] As a further scheme of the present application, the wing further comprises transparent side plates arranged on both sides of the upper top plate and the lower bottom plate, the transparent side plates are fixed with the lower bottom plate, and the inner wall of the transparent side plate is attached to the upper top plate.

[0011] As a further scheme of the present application, the cabinet body is further provided with a mounting slot in the front wall, a tempered glass is mounted at the slot opening of the mounting slot, the fan and the wing are mounted in the mounting slot, and a atomizer is further arranged between the fan and the wing.

[0012] As a further scheme of the present application, the mounting slot is internally provided with a rectifier communicated with the outside of the cabinet body, and the rectifier is arranged beside the end of the wing away from the fan.

[0013] As a further scheme of the present application, the wing is rotatably connected to the cabinet body through a horizontal rotating shaft, the horizontal rotating shaft is perpendicular to the length direction of the wing, and the rotating angle of the wing is adjustable.

[0014] As a further scheme of the present application, the wing is arranged on both sides of the horizontal rotating shaft with equal weight to keep the wing horizontal in normal state, a rotating handle is fixed on the wing and penetrates the tempered glass, and an arc-shaped long hole is arranged on the tempered glass for the sliding of the rotating handle.

[0015] As a further scheme of the present application, the slot bottom of the mounting slot is provided with a display screen.

[0016] Compared with the prior art, the present application has the following beneficial effects:

[0017] 1. The air flow channel is arranged in the wing, the air flow is blown to the wing by the fan, and the lifting force is generated on the light balls after the pressure difference is formed on the top surface and the bottom surface of the wing, so that the light balls make lifting movement in the air flow channel. The light balls are lifted in the air flow channel, so that the generation of the lifting force of the wing is directly displayed, the whole wing does not need to be lifted and slid, and the demand for the blowing range of the fan in the large Bernoulli principle demonstration device is effectively reduced.

[0018] 2、The upper top plate adopts a deformable elastic material, and the air flow channel is jointly formed by the inner cavity of the transparent tube and the transparent sleeve inner cavity of the sliding sleeve on the transparent tube, so that the air flow channel forms a floating structure with adjustable length. When the transparent sleeve is driven by the electric cylinder and makes a lifting motion to push the elastic deformation of the upper top plate, the curvature of the upper top plate changes, thereby changing the pressure difference between the upper surface and the lower surface of the wing, and adjusting the upward force of the light small ball in the air flow channel, thereby improving the diversity of the Bernoulli principle display.

[0019] 3、The upper top plate is deformed by the pushing head, and the arc surface structure of the top surface of the pushing head is matched with the bottom surface of the elastically deformed upper top plate, so that the top of the upper top plate can form a smooth arc surface structure after extrusion deformation.

[0020] 4、The silica cloth wrapped around the outer periphery of the upper top plate and the lower bottom plate can maintain the integrity of the whole wing after the upper top plate is deformed, and further ensure the integrity of the gas flow lines formed on the surfaces of the upper top plate and the lower bottom plate.

[0021] 5、An atomizer is arranged between the fan and the wing, which facilitates the intuitive display of the flow line condition of the air flow outside the wing.

[0022] 6、The rotation angle of the wing can be adjusted, and the operator can also rotate the wing and watch the air flow direction on both sides of the wing and the movement state of the small ball in the wing, thereby further demonstrating the Bernoulli principle. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is an internal structure diagram of the wing in the application.

[0024] Figure 2 It is a structure diagram of the application.

[0025] Figure 3 It is an internal overhead structure diagram of the cabinet in the application.

[0026] Figure 4 It is an internal overhead structure diagram of the wing in the application.

[0027] In the figure: 10, cabinet; 11, tempered glass; 111, arc-shaped long hole; 12, mounting groove; 20, display screen; 30, wing; 31, lower bottom plate; 32, upper top plate; 33, transparent tube; 34, light small ball; 35, transparent sleeve; 351, pushing head; 36, electric cylinder; 37, transparent side plate; 371, handle; 38, silica cloth; 39, air flow channel; 40, fan; 50, flow regulator; 60, atomizer. DETAILED DESCRIPTION

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] For ease of understanding, the specific structure and operation of the present invention will be further described below with reference to the accompanying drawings:

[0030] The specific structure of this invention is as follows: Figures 1-4 As shown, its main structure includes a horizontally arranged wing 30 under normal conditions and a fan 40 arranged beside one end of the wing 30. The fan 40 blows air at one end of the wing 30 to create a pressure difference between the top and bottom surfaces of the wing 30. Unlike the prior art, the wing 30 of this application has a vertically distributed airflow channel 39 inside. This airflow channel 39 can be seen from the outside of the wing 30, and the viewer can observe the internal state of the airflow channel 39. The airflow channel 39 is connected to both the top and bottom surfaces of the wing 30. A lightweight ball 34 is placed in the inner cavity of the airflow channel 39. After a pressure difference is created between the top and bottom surfaces of the wing 30, the lightweight ball 34 can rise under the action of the pressure difference between the top and bottom surfaces of the wing 30. This application demonstrates the generation of lift on the wing 30 by allowing a lightweight ball 34 to rise within the airflow channel 39, eliminating the need for the entire wing 30 to rise and slide, thus effectively reducing the required blowing range of the fan 40 in large Bernoulli principle demonstration devices. Of course, in practical implementation, traditional demonstration mechanisms that allow the entire wing 30 to rise and slide can also be used in conjunction with the airflow channel 39 and lightweight ball 34 in this application to achieve a dual demonstration effect of both the wing 30 and the lightweight ball 34 rising.

[0031] Based on the above, to demonstrate the effect of different curvatures of the wing 30's top surface on the pressure changes at the top and bottom of the wing 30, the upper top plate 32 in this application is an adjustable curvature structure. Specifically, as shown... Figure 1As shown, the wing 30 comprises an upper roof 32 and a lower floor 31, the upper roof 32 is a flexible steel plate; the upper roof 32 and the lower floor 31 have a hollow chamber therebetween, the hollow chamber is provided with a transparent tube 33 fixed with the lower floor 31 and vertically distributed, the transparent tube 33 is slidingly sleeved with a transparent sleeve 35, the transparent sleeve 35 and the inner cavity of the transparent tube 33 together form an airflow channel 39; the transparent sleeve 35 is driven to lift and descend by an electric cylinder 36, and can push the upper roof 32 to produce elastic deformation. In the present application, the airflow channel 39 adopts a telescopic structure formed by the combination of the transparent tube 33 and the transparent sleeve 35, in addition, the change of the curvature of the upper roof 32 is also realized synchronously by the extension and contraction of the transparent sleeve 35, the adaptability between the curvature of the upper roof 32 and the length of the airflow channel 39 can be realized by driving the transparent sleeve 35 to lift and descend, thereby changing the pressure difference between the upper surface and the lower surface of the wing 30, realizing the adjustment of the upward force of the lightweight small ball 34 in the airflow channel 39, and thereby improving the diversity of the Bernoulli principle display.

[0032] Further, as shown in Figure 1 The top of the transparent sleeve 35 is fixed with a push head 351, the middle part of the push head 351 has a through hole communicated with the inner cavity of the transparent sleeve 35 and the top surface of the upper roof 32. The push head 351 is fixed with the upper roof 32, which can ensure that the inner cavity of the transparent sleeve 35 and the communication part of the upper surface of the wing 30 will not be dislocated when the transparent sleeve 35 lifts and descends. In addition, the top surface of the push head 351 is arc-shaped to match the bottom surface of the upper roof 32 after the elastic deformation, so as to ensure that the top of the upper roof 32 can form a smooth arc-shaped structure after the elastic deformation.

[0033] On the basis of the above, as shown in Figure 1 The outer periphery of the upper roof 32 and the lower floor 31 is wrapped with a silica gel cloth 38, which can keep the whole wing 30 complete after the deformation of the upper roof 32, and further ensure the integrity of the gas flow line formed by the airflow on the surface of the upper roof 32 and the lower floor 31.

[0034] On the basis of the above, as shown in Figure 4 The wing 30 further comprises transparent side plates 37 arranged on both sides of the upper roof 32 and the lower floor 31, the transparent side plates 37 are fixed with the lower floor 31, and the inner wall of the transparent side plates 37 abuts against the upper roof 32. In the present embodiment, the upper roof 32 and the lower floor 31 are sealed by the transparent side plates 37, which can ensure that the airflow channel 39 is visible, and prevent the airflow from entering the inner cavity of the wing 30 from both sides of the upper roof 32 and the lower floor 31 to form turbulence. In addition, the transparent side plates 37 are installed in a manner that the inner wall abuts against the upper roof 32, and the upper roof 32 and the transparent side plates 37 are slidingly fitted when the upper roof 32 deforms, which will not hinder the deformation of the upper roof 32.

[0035] On the basis of the above, as shown in Figure 3As shown, the cabinet body 10 is provided with a mounting groove 12 in the front wall, and a tempered glass 11 is mounted at the opening of the mounting groove 12. The fan 40 and the airfoil 30 are both mounted in the mounting groove 12, and a atomizer 60 is further arranged between the fan 40 and the airfoil 30. In this embodiment, the atomizer 60 is arranged to facilitate the intuitive display of the streamline condition of the airflow outside the airfoil 30. In addition, the airfoil 30, the atomizer 60 and the fan 40 are arranged in the cabinet body 10, so that the demonstration process is less affected by external wind energy.

[0036] Further, as shown in Figure 3 , the inside of the mounting groove 12 is provided with a flow straightener 50 which is in communication with the outside of the cabinet body 10, and the flow straightener 50 is arranged beside the end of the airfoil 30 away from the fan 40. The flow straightener 50 adopts the flow straightening grid in the prior art. Since the airflow at the rear end of the airfoil 30 tends to become chaotic, the arrangement of the flow straightener 50 at the rear end of the airfoil 30 can make the airflow exiting from the rear outlet maintain a parallel airflow direction. It is ensured that the airflow maintains an orderly parallel airflow form in the entire interval between the blowing port of the fan 40 and the outlet of the cabinet body 10, avoiding chaotic airflow at the rear end which leads to the failure of the overall demonstration experiment.

[0037] On the basis of the above, as shown in Figure 3 and Figure 4 , the airfoil 30 is rotatably connected to the cabinet body 10 by a horizontal rotating shaft which is perpendicular to the length direction of the airfoil 30, and the rotating angle of the airfoil 30 is adjustable. With the adjustable rotating angle of the airfoil 30, the operator can further demonstrate the Bernoulli principle by rotating the airfoil 30 and observing the airflow direction on both sides of the airfoil 30 and the movement state of the small balls in the airfoil 30. In this embodiment, the rotating angle adjustment of the airfoil 30 can be realized by a motor with locking function, or by a latch structure.

[0038] Further, in order to increase the interactivity between the angle adjustment of the airfoil 30 and the operator, as shown in Figure 3 and Figure 4 , the airfoil 30 is arranged with equal weight on both sides of the horizontal rotating shaft, so that the airfoil 30 remains horizontal in the normal state, and the end of the airfoil 30 can be aligned with the fan 40 in the normal state, ensuring that the fan 40 can form stable airflow on the top and bottom of the airfoil 30 in the initial state. In addition, a handle 371 is fixed on the airfoil 30 and penetrates the tempered glass 11, and an arc-shaped long hole 111 is arranged on the tempered glass 11 for sliding of the handle 371, so as to facilitate the manual operation of the airfoil 30 by the operator, and improve the interactivity of the demonstration device.

[0039] As shown in Figure 3As shown, the bottom of the installation groove 12 is provided with a display screen 20. The display screen 20 plays a popular science video of Bernoulli's principle in a cycle in a state that the device is not started, so as to deepen the understanding of the Bernoulli's principle of the viewer.

[0040] It is worth mentioning that, in order to further show the streamline of the airflow on the top surface of the wing 30 and the ground, the display screen 20 also has the function of displaying the force streamline diagram of the wing 30 in real time, so as to further deepen the understanding of the Bernoulli's principle of the viewer.

[0041] The specific steps of displaying the force streamline diagram in the display screen 20 are as follows:

[0042] The contour parameters of the wing 30 in the initial state and the airflow velocity on the top surface of the wing 30 and the ground are obtained, a simulation model of the wing 30 is established in the computer, the real airflow direction is simulated through the simulation model, the force streamline diagram of the wing 30 is formed, and is displayed on the display screen 20.

[0043] When the audience rotates the wing 30, the angle of rotation of the wing 30 is obtained, which can be realized through an encoder; according to the obtained angle of rotation information, the computer synchronously rotates the simulation model by the same angle, and then simulates the airflow direction to form the force streamline diagram of the wing 30, which is displayed on the display screen 20.

[0044] When the audience adjusts the camber of the wing 30, since the top curve of the wing 30 is relatively complex, in the demonstration device, the curve of the upper top plate 32 on the wing 30 is simplified as an existing catenary equation for simulation. When the electric cylinder 36 moves upward, the distance that the electric cylinder 36 moves upward is obtained, so that the distance that the vertex of the top curve of the upper top plate 32 moves upward is determined, the camber change of the upper side curve of the upper top plate 32 is calculated, the changed curve camber is synchronously updated to the simulation model in the computer, and then the airflow direction and the force streamline diagram of the changed wing 30 are output and displayed on the display screen 20.

[0045] Of course, for those skilled in the art, the present application is not limited to the details of the above exemplary embodiments, but also includes the same or similar structures that can be realized in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting, and the scope of the present application is defined by the appended claims rather than the above description, and therefore all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0046] In addition, it should be understood that, although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be appropriately combined to form other embodiments that those skilled in the art can understand.

[0047] The technologies, shapes, and structural parts not described in detail in the present application are well-known technologies.

Claims

1. A Bernoulli visualization device, comprising a wing (30) arranged horizontally in normal operation and a fan (40) arranged beside one end of the wing (30), characterized in that, The interior of the wing (30) is provided with vertically distributed airflow channels (39), which can be seen from the outside of the wing (30), and the airflow channels (39) are connected to the top and bottom surfaces of the wing (30). The inner cavity of the airflow channels (39) is provided with a lightweight ball (34), which can move upward under the pressure difference between the top and bottom surfaces of the wing (30). The wing (30) includes an upper top plate (32) and a lower bottom plate (31). The upper top plate (32) is an elastic steel plate. There is a hollow cavity between the upper top plate (32) and the lower bottom plate (31). A transparent tube (33) is fixed to the lower bottom plate (31) and vertically distributed in the hollow cavity. A transparent sleeve (35) is slidably sleeved on the transparent tube (33). The inner cavity of the transparent sleeve (35) and the transparent tube (33) together form an airflow channel (39). The transparent sleeve (35) is driven to rise and fall by an electric cylinder (36) and can push the upper top plate (32) to produce elastic deformation. It also includes a cabinet (10), the front wall of which is provided with an installation groove (12), tempered glass (11) is installed at the groove opening of the installation groove (12), the fan (40) and the wing (30) are both installed in the installation groove (12), and an atomizer (60) is also provided between the fan (40) and the wing (30); The wing (30) is rotatably connected to the cabinet (10) via a horizontal pivot, which is perpendicular to the length direction of the wing (30), and the rotation angle of the wing (30) is adjustable.

2. The Bernoulli visualization device according to claim 1, characterized in that, The top of the transparent sleeve (35) is fixed with a pusher (351), which is fixed to the upper top plate (32). The top surface of the pusher (351) is arc-shaped so as to fit against the bottom surface of the upper top plate (32) after it is squeezed and elastically deformed. The middle part of the pusher (351) has a through hole that communicates with both the inner cavity of the transparent sleeve (35) and the top surface of the upper top plate (32).

3. The Bernoulli visualization device according to claim 1, characterized in that, The outer periphery of the upper top plate (32) and the lower bottom plate (31) is covered with silicone cloth (38).

4. The Bernoulli visualization device according to claim 1, characterized in that, The wing (30) also includes transparent side panels (37) disposed on both sides of the upper top plate (32) and the lower bottom plate (31). The transparent side panels (37) are fixed to the lower bottom plate (31), and the inner wall of the transparent side panels (37) is in contact with the upper top plate (32).

5. A Bernoulli visualization device according to claim 1, characterized in that, The mounting slot (12) is equipped with a rectifier (50) that communicates with the outside of the cabinet (10). The rectifier (50) is arranged on the side of the wing (30) away from the fan (40).

6. The Bernoulli visualization device according to claim 1, characterized in that, The wings (30) are located on both sides of the horizontal pivot with equal weight so that the wings (30) remain horizontal under normal conditions. A throttle (371) that penetrates the tempered glass (11) is fixed on the wings (30). The tempered glass (11) is provided with an arc-shaped elongated hole (111) for sliding the throttle (371).

7. The Bernoulli visualization device according to claim 1, characterized in that, A display screen (20) is provided at the bottom of the mounting slot (12).

Images