Comprehensive demonstration device based on fluid pressure and flow rate relationship

Abstract

The utility model provides a kind of comprehensive demonstration device based on fluid pressure and flow rate relationship, and the device is mainly composed of four modules integrated on bearing main body: gas pipeline effect demonstration module, gas pressure and flow rate relationship demonstration module, liquid pressure and flow rate relationship demonstration module and wing lift principle demonstration module.Bearing main body includes bottom plate and pedestal fixed thereon, pedestal cross section is triangle, with three sides.Gas pipeline effect, gas pressure and flow rate relationship, liquid pressure and flow rate relationship three demonstration modules are respectively installed on the three sides of pedestal, and wing lift principle demonstration module is built-in in the hollow part on pedestal.The device is integrated with multiple demonstration modules related to fluid pressure and flow rate relationship on different sides of pedestal, forming compact portable whole.This not only facilitates carrying and operation demonstration, but also effectively reduces the burden of teachers, helps students to clearly and comprehensively understand core knowledge, and significantly improves teaching effect.

Description

Technical Field

[0001] This utility model relates to the field of teaching demonstration, and in particular to a comprehensive demonstration device based on the relationship between fluid pressure and flow velocity. Background Technology

[0002] In secondary school physics teaching, the relationship between fluid pressure and flow velocity is an important component of the fundamental theory of fluid mechanics. However, due to the abstract and dynamic nature of fluid pressure, its operating principles (such as lower pressure with higher flow velocity) are difficult to demonstrate intuitively through traditional theoretical lectures or static teaching aids. Current teaching commonly employs discrete demonstration experiments to assist instruction (e.g., demonstrations of aircraft lift, the relationship between hydraulic pressure and flow velocity, and the relationship between air pressure and flow velocity). However, the inventors found in practice that each experiment requires its own independent equipment, resulting in a large variety of equipment, disorganized storage, low transport efficiency, and a significant waste of class time, leading to low experimental efficiency. Utility Model Content

[0003] Therefore, it is necessary to provide a comprehensive demonstration device based on the relationship between fluid pressure and flow velocity, which is easy to carry, simple to operate, and helps to reduce the burden on teachers and improve teaching effectiveness.

[0004] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: A comprehensive demonstration device based on the relationship between fluid pressure and flow velocity includes a supporting body, a gas pipeline effect demonstration module, a gas pressure and flow velocity relationship demonstration module, a liquid pressure and flow velocity relationship demonstration module, and a wing lift principle demonstration module respectively assembled on the supporting body; the supporting body includes a base plate and a base fixedly connected to the base plate, the base plate has a triangular cross-section and has three sides; the gas pipeline effect demonstration module, the gas pressure and flow velocity relationship demonstration module, and the liquid pressure and flow velocity relationship demonstration module are respectively installed on the three sides of the base plate; a hollow part is formed on the side where the gas pressure and flow velocity relationship demonstration module is located, at a position adjacent to the gas pressure and flow velocity relationship demonstration module, and the wing lift principle demonstration module is built into the hollow part.

[0005] In one embodiment, the gas pipeline effect demonstration module includes a first large-diameter air pipe with an inlet end supplied by an external air source, a first small-diameter air pipe connected to the outlet end of the first large-diameter air pipe, two ventilation pipes, and a small ball movably disposed inside the ventilation pipes. The first large-diameter air pipe and the first small-diameter air pipe are fixed on the corresponding sides of the base. One end of one of the ventilation pipes is connected to the first large-diameter air pipe, and one end of the other ventilation pipe is connected to the first small-diameter air pipe.

[0006] In one embodiment, the liquid pressure and flow rate relationship demonstration module includes a liquid storage bottle on a platform mounted on the base plate, a water outlet pipe connected to the liquid storage bottle, a valve mounted on the water outlet pipe, two transparent pipes respectively connected to the liquid storage bottle and the water outlet pipe, and a liquid receiving box mounted on the base plate for collecting the solution discharged from the valve.

[0007] In one embodiment, the liquid pressure and flow rate relationship demonstration module further includes a miniature water pump located below the liquid surface of the receiving box. The miniature water pump is connected to a circulation pipe, the end of which extends to the liquid inlet on the storage bottle.

[0008] In one embodiment, the gas pressure and flow rate relationship demonstration module includes a second large-diameter air pipe supplied with air from an external air source at the air inlet, a second small-diameter air pipe connected to the air outlet of the second large-diameter air pipe, a U-shaped manometer containing dyeing solution, and two conduits. The second large-diameter air pipe, the second small-diameter air pipe, and the U-shaped manometer are all fixed on the corresponding sides of the base. The two ends of one conduit are respectively connected to the first port of the second large-diameter air pipe and the first port of the U-shaped manometer, and the two ends of the other conduit are respectively connected to the second small-diameter air pipe and the second port of the U-shaped manometer.

[0009] In one embodiment, the wing lift principle demonstration module includes a guide on the hollowed-out portion and a wing model that passes through the guide and can move along the length of the guide under the supply of an external air source.

[0010] In one embodiment, the number of guides and wing models is set to two sets, with each set of wing models mounted on the corresponding guides in opposite directions.

[0011] In one embodiment, the guide includes hooks located on the upper and lower sides of the hollowed-out portion and elastic ropes connected to the corresponding hooks at both ends, with the wing model disposed on the elastic ropes.

[0012] In one embodiment, the base is formed by splicing three panels together, and a cavity with an open top is formed inside the base. One of the splicing panels has a through groove on its surface that communicates with the cavity, and the through groove constitutes the hollow part.

[0013] In one embodiment, the base plate and the splicing plate are made of wood or plastic.

[0014] The beneficial effects of this utility model are as follows: This utility model provides a comprehensive demonstration device based on the relationship between fluid pressure and flow velocity. The supporting body is designed as a base plate with a triangular platform on the base plate. One side of the platform has a hollow section for installing a wing lift principle demonstration module. Furthermore, to enhance the device's integration and portability, multiple demonstration modules used in experiments involving the gas pipeline effect, gas pressure and flow velocity relationship, and liquid pressure and flow velocity relationship are integrated and mounted on the corresponding surfaces of the platform to form a unified whole. This makes the entire device structure more compact, not only easy to carry but also simpler to operate, helping to reduce the burden on teachers and thus improve teaching effectiveness. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the supporting structure of the integrated demonstration device based on the relationship between fluid pressure and flow velocity of this utility model;

[0017] Figure 2 This is a schematic diagram of the structure of the integrated demonstration device based on the relationship between fluid pressure and flow velocity of this utility model, which includes a gas pipeline effect demonstration module.

[0018] Figure 3 This is a schematic diagram of the structure of the integrated demonstration device based on the relationship between fluid pressure and flow velocity of this utility model, showing the valve in the open state, including a module demonstrating the relationship between liquid pressure and flow velocity.

[0019] Figure 4 This is a schematic diagram of the structure of the integrated demonstration device based on the relationship between fluid pressure and flow velocity of this utility model, which includes a gas pressure and flow velocity relationship demonstration module and a wing lift principle demonstration module.

[0020] In the attached diagram: 1. Supporting body; 11. Base plate; 12. Base platform; 120. Hollowed-out section; 121. Splicing plate; 122. Cavity; 13. Platform; 2. Gas pipeline effect demonstration module; 21. First large-diameter gas pipe; 22. First small-diameter gas pipe; 23. Ventilation pipe; 24. Small ball; 3. Gas pressure and flow velocity relationship demonstration module; 31. Second large-diameter gas pipe; 32. Second small-diameter gas pipe; 33. U-shaped manometer; 34. Conduit; 4. Liquid pressure and flow velocity relationship demonstration module; 41. Liquid storage bottle; 411. Liquid inlet; 42. Water outlet pipe; 43. Valve; 44. Liquid receiving box; 45. Miniature water pump; 46. Circulation pipe; 47. Transparent pipe; 5. Wing lift principle demonstration module; 51. Guide component; 511. Hook; 512. Elastic rope; 52. Wing model. Detailed Implementation

[0021] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments of the present invention can be combined with each other. The technical solutions of the present invention will be further described below with reference to the accompanying drawings of the embodiments. The present invention is not limited to the specific embodiments described below.

[0022] It should be understood that the same or similar reference numerals in the accompanying drawings of the embodiments correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "front," "rear," "left," "right," "top," and "bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms describing positional relationships in the accompanying drawings are for illustrative purposes only and should not be construed as limiting this patent. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0023] In one embodiment, such as Figures 1-4As shown, a comprehensive demonstration device based on the relationship between fluid pressure and flow velocity includes a supporting body 1, a gas pipe effect demonstration module 2, a gas pressure and flow velocity relationship demonstration module 3, a liquid pressure and flow velocity relationship demonstration module 4, and a wing lift principle demonstration module 5, all assembled on the supporting body 1. The supporting body 1 includes a base plate 11 and a base 12 fixedly connected to the base plate 11. The base 12 has a triangular cross-section and three sides. The gas pipe effect demonstration module 2, the gas pressure and flow velocity relationship demonstration module 3, and the liquid pressure and flow velocity relationship demonstration module 4 are respectively installed on the three sides of the base 12. A hollow portion 120 is formed on the side where the gas pressure and flow velocity relationship demonstration module 3 is located, adjacent to the gas pressure and flow velocity relationship demonstration module 3. The wing lift principle demonstration module 5 is built into the hollow portion 120.

[0024] Compared with the prior art, this utility model has at least the following advantages: The comprehensive demonstration device based on the relationship between fluid pressure and velocity provided by this utility model designs the supporting body 1 as a base plate 11 and a triangular base 12 on the base plate 11. A hollow portion 120 is provided on one side of the base 12 for installing the wing lift principle demonstration module 5. Furthermore, to improve the integration and portability of the device, the demonstration modules used in multiple experiments—the gas pipeline effect demonstration module 2, the gas pressure and velocity relationship demonstration module 3, and the liquid pressure and velocity relationship demonstration module 4—are all integrated and set on the corresponding surfaces of the base 12 to form a whole. This makes the entire device structure more compact, not only convenient to carry but also easier to operate, helping to reduce the burden on teachers and thus improve teaching effectiveness.

[0025] In one embodiment, such as Figure 1 and Figure 2 As shown, the gas pipeline effect demonstration module 2 includes a first large-diameter air pipe 21 with an external air source supplying air at the inlet end, a first small-diameter air pipe 22 connected to the outlet end of the first large-diameter air pipe 21, two ventilation pipes 23, and a small ball 24 movably disposed in the ventilation pipe 23. The first large-diameter air pipe 21 and the first small-diameter air pipe 22 are fixed on the corresponding sides of the base 12. One end of one ventilation pipe 23 is connected to the first large-diameter air pipe 21, and one end of the other ventilation pipe 23 is connected to the first small-diameter air pipe 22.

[0026] In this experimental example, an external air source (such as a blower) supplies air to one end of the first large-diameter air pipe 21, which is connected to the ventilation pipe 23. The air only changes direction, while the flow velocity remains constant, thus generating sufficient thrust to blow the small ball 24 out of the ventilation pipe 23. When the air flows through the first small-diameter air pipe 22, the air velocity increases accordingly due to the reduced pipe diameter, resulting in a decrease in pressure and the formation of suction, which draws the small ball 24 into the ventilation pipe 23 connected to the first small-diameter air pipe 22. This experiment visually demonstrates the relationship between gas pressure and flow velocity to students.

[0027] In practical implementation, both the first large-diameter air pipe 21 and the first small-diameter air pipe 22 are vertically fixed to an outer surface of the base 12 using adhesive. Both ventilation pipes 23 are horizontally connected to the first large-diameter air pipe 21 and the first small-diameter air pipe 22, ensuring that the small ball 24 does not easily fall out when placed inside the ventilation pipe 23. For actual assembly, refer to... Figure 2 As shown, a reducing tee 25 can be used to connect the first large-diameter air pipe 21 (inner diameter Φ30mm) and the first small-diameter air pipe 22 (inner diameter Φ25mm) to achieve a gradual change in pipe diameter. Then, equal diameter tees 26a and 26b with inner diameters of Φ30mm and Φ25mm respectively are connected to the upper and lower ends of the reducing tee 25, and then connected laterally to the ventilation pipe 23 of the corresponding diameter to form an airflow channel.

[0028] In one embodiment, such as Figure 1 and Figure 3 As shown, the liquid pressure and flow rate relationship demonstration module 4 includes a liquid storage bottle 41 mounted on a platform 13 on the base plate 11, a water outlet pipe 42 connected to the liquid storage bottle 41, a valve 43 mounted on the water outlet pipe 42, two transparent pipes 47 respectively connected to the liquid storage bottle 41 and the water outlet pipe 42, and a liquid receiving box 44 mounted on the base plate 11 and located below the valve 43 for collecting the solution discharged from the valve 43.

[0029] In this experimental example, after opening valve 43, the receiving box 44 collects the liquid flowing from the outlet pipe 42. Simultaneously, the storage bottle 41 is connected to the outlet pipe 42, creating water flows at different velocities. The high-speed water flow in the outlet pipe 42 generates low pressure, resulting in a lower liquid level in the connected transparent tube 47; while the low-speed water flow in the storage bottle 41 generates high pressure, resulting in a higher liquid level in the connected transparent tube 47. This experiment visually demonstrates the relationship between liquid pressure and flow velocity to students. In practice, the storage bottle 41 can be made from a regular mineral water bottle, which is simple to manufacture, and it contains a dyed liquid for easy observation.

[0030] In one embodiment, such as Figure 1 and Figure 3As shown, the liquid pressure and flow rate relationship demonstration module 4 also includes a miniature water pump 45 located below the liquid surface of the liquid receiving box 44. The miniature water pump 45 is connected to a circulation pipe 46, and the end of the circulation pipe 46 extends to the liquid inlet 411 on the liquid storage bottle 41.

[0031] In this experimental example, by adding a miniature water pump 45, the liquid in the liquid collection box 44 can be drawn and returned to the liquid inlet 411 on the storage bottle 41 via the circulation pipe 46. This further extends the demonstration time, providing teachers with ample opportunity to explain the experimental phenomena in detail, while also giving students more opportunities to participate in observation and discussion, effectively promoting classroom interaction between teachers and students, and thus enhancing the teaching effect. In practical implementation, the liquid inlet 411 can be made from readily available water bottles, by cutting the appropriate opening and then attaching it to the storage bottle 41.

[0032] In one embodiment, such as Figure 1 and Figure 4 As shown, the gas pressure and flow rate relationship demonstration module 3 includes a second large-diameter air pipe 31 with an external air source supplying air at the inlet end, a second small-diameter air pipe 32 connected to the outlet end of the second large-diameter air pipe 31, a U-shaped pressure gauge 33 containing dyeing solution, and two conduits 34. The second large-diameter air pipe 31, the second small-diameter air pipe 32, and the U-shaped pressure gauge 33 are all fixed on the corresponding side of the base 12. The two ends of one conduit 34 are respectively connected to the first port of the second large-diameter air pipe 32 and the first port of the U-shaped pressure gauge 33, and the two ends of the other conduit 34 are respectively connected to the second small-diameter air pipe 32 and the second port of the U-shaped pressure gauge 33.

[0033] In this experimental example, Figure 4 The illustrated gas pressure and flow velocity relationship demonstration module 3 is in a state where no external air source is supplying gas. When an external air source (such as a blower) supplies gas to one end of the second large-diameter air pipe 31, the second large-diameter air pipe 31 and the second small-diameter air pipe 32 form airflows of different magnitudes. The second small-diameter air pipe 32, with its smaller diameter, generates a high-speed airflow, resulting in low pressure; while the airflow velocity in the second large-diameter air pipe 31 is relatively slow, and the pressure remains relatively stable. Therefore, when the U-shaped manometer 33 is connected to both sides of the second large-diameter air pipe 31 and the second small-diameter air pipe 32 respectively, a pressure difference will be observed, resulting in a significant liquid level difference, that is, the water column on the second port side of the U-shaped manometer 33 is higher than the water column on the first port side. Thus, the above experiment can intuitively demonstrate the relationship between gas pressure and flow velocity to students. In specific implementation, both the second large-diameter air pipe 31 and the second small-diameter air pipe 32 are fixed to an outer surface of the base 12 with adhesive.

[0034] In one embodiment, such as Figure 1 and Figure 4As shown, the wing lift principle demonstration module 5 includes a guide 51 disposed on the hollowed-out part 120 and a wing model 52 that passes through the guide 51 and can move along the length direction of the guide 51 under the supply of an external air source.

[0035] In this experimental example, the wing model 52 adopts an arc-shaped airfoil with one convex surface and the other flat surface. An external air source (such as a blower) directs airflow towards the windward side of the wing model 52. The airflow on the convex side of the wing model 52 is faster than on the flat side, resulting in lower pressure. Conversely, the airflow on the flat side of the wing model 52 is slower, resulting in higher pressure. This pressure difference drives the wing model 52 to move vertically along the guide member 51, thus visually reproducing the lift generation process of the wing model 52.

[0036] In practical implementation, to help students deeply understand the principle of lift generation, this device is also specially equipped with a digital anemometer, which enables a direct display of the difference in airflow velocity. During the experiment, turning on the anemometer allows for rapid measurement of wind speed on the upper and lower surfaces of the wing model 52, displaying the readings in real time, thus paving an intuitive and smooth path for students to understand the principle of lift.

[0037] In one embodiment, such as Figure 4 As shown, the guide 51 and wing model 52 are set in two groups, with each group's wing model 52 installed on the corresponding guide 51 in opposite directions. In this experimental example, by setting the number of guide 51 and wing model 52 to two groups, with one wing model 52 fitted onto each group's guide 51, one group of wing models 52 maintains the conventional installation posture (convex side facing the wind), while the other group is rotated 180° and installed in the opposite direction (convex side facing away from the wind), forming a mirror-like dynamic comparison, the experimental switching time can be reduced, and students' intuitive understanding of the directionality of aerodynamic forces can be enhanced.

[0038] In one embodiment, such as Figure 4 As shown, the guide 51 includes hooks 511 located on the upper and lower sides of the hollowed-out portion 120 and elastic ropes 512 connected to the corresponding hooks 511 at both ends. The wing model 52 is mounted on the elastic ropes 512. In this embodiment, the use of hooks 511 and elastic ropes 512 facilitates the installation of the guide 51, and the components are easy to procure and inexpensive.

[0039] In one embodiment, such as Figure 1As shown, the base 12 is formed by splicing three panels 121 together, and a cavity 122 with an open top is formed inside the base 12. One of the splicing panels 121 has a through groove on its surface that communicates with the cavity 122, and the through groove constitutes the hollow part 120. In this embodiment, the cavity 122 structure is formed by combining three splicing panels 121, and one splicing panel 121 is provided with a through groove that constitutes the hollow part 120. This optimizes the spatial layout, reduces the amount of material used, and achieves structural weight reduction while ensuring the load-bearing capacity of the base 12.

[0040] In one embodiment, such as Figure 1 As shown, the base plate 11 and the splicing plate 121 are made of wood or plastic. In this embodiment, the supporting body is made of wood, which is readily available, inexpensive, and effectively reduces operating costs, making it suitable for widespread use.

[0041] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating this utility model, and are not intended to limit the implementation of this utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A comprehensive demonstration device based on the relationship between fluid pressure and flow velocity, comprising a supporting body, characterized in that, The device further includes a gas pipeline effect demonstration module, a gas pressure and flow velocity relationship demonstration module, a liquid pressure and flow velocity relationship demonstration module, and a wing lift principle demonstration module, all assembled on the supporting body. The supporting body includes a base plate and a platform fixedly connected to the base plate. The platform has a triangular cross-section and three sides. The gas pipeline effect demonstration module, the gas pressure and flow velocity relationship demonstration module, and the liquid pressure and flow velocity relationship demonstration module are respectively installed on the three sides of the platform. A hollow portion is formed on the side where the gas pressure and flow velocity relationship demonstration module is located, adjacent to the gas pressure and flow velocity relationship demonstration module. The wing lift principle demonstration module is built into the hollow portion.

2. The integrated demonstration device based on the relationship between fluid pressure and flow velocity according to claim 1, characterized in that, The gas pipeline effect demonstration module includes a first large-diameter air pipe supplied with air from an external air source at the air inlet end, a first small-diameter air pipe connected to the air outlet end of the first large-diameter air pipe, two ventilation pipes, and a small ball movable inside the ventilation pipes. The first large-diameter air pipe and the first small-diameter air pipe are fixed on the corresponding sides of the base. One end of one of the ventilation pipes is connected to the first large-diameter air pipe, and one end of the other ventilation pipe is connected to the first small-diameter air pipe.

3. The integrated demonstration device based on the relationship between fluid pressure and flow velocity according to claim 1, characterized in that, The liquid pressure and flow rate relationship demonstration module includes a liquid storage bottle on a platform set on the base plate, a water outlet pipe connected to the liquid storage bottle, a valve installed on the water outlet pipe, two transparent pipes respectively connected to the liquid storage bottle and the water outlet pipe, and a liquid receiving box set on the base plate for collecting the solution discharged from the valve.

4. The integrated demonstration device based on the relationship between fluid pressure and flow velocity according to claim 3, characterized in that, The liquid pressure and flow rate relationship demonstration module also includes a miniature water pump located below the liquid surface in the receiving box. The miniature water pump is connected to a circulation pipe, the end of which extends to the liquid inlet on the storage bottle.

5. The integrated demonstration device based on the relationship between fluid pressure and flow velocity according to claim 1, characterized in that, The gas pressure and flow rate relationship demonstration module includes a second large-diameter air pipe supplied by an external air source at the air inlet, a second small-diameter air pipe connected to the air outlet of the second large-diameter air pipe, a U-shaped manometer containing dyeing solution, and two conduits. The second large-diameter air pipe, the second small-diameter air pipe, and the U-shaped manometer are all fixed on the corresponding sides of the base. The two ends of one conduit are respectively connected to the first port of the second large-diameter air pipe and the first port of the U-shaped manometer, and the two ends of the other conduit are respectively connected to the second small-diameter air pipe and the second port of the U-shaped manometer.

6. The integrated demonstration device based on the relationship between fluid pressure and flow velocity according to claim 1, characterized in that, The wing lift principle demonstration module includes a guide on the hollowed-out part and a wing model that passes through the guide and can move along the length of the guide when supplied with air from an external air source.

7. The integrated demonstration device based on the relationship between fluid pressure and flow velocity according to claim 6, characterized in that, The number of guides and wing models is set to two sets, with each set of wing models installed on the corresponding guides in opposite directions.

8. The integrated demonstration device based on the relationship between fluid pressure and flow velocity according to claim 6 or 7, characterized in that, The guide includes hooks located on the upper and lower sides of the hollowed-out portion and elastic ropes connected to the corresponding hooks at both ends, with the wing model placed on the elastic ropes.

9. The integrated demonstration device based on the relationship between fluid pressure and flow velocity according to claim 1, characterized in that, The base is formed by splicing three splicing plates together, and a cavity with an open top is formed inside the base. One of the splicing plates has a through groove on its surface that communicates with the cavity, and the through groove constitutes the hollow part.

10. The integrated demonstration device based on the relationship between fluid pressure and flow velocity according to claim 9, characterized in that, The base plate and the splicing plate are made of wood or plastic.

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