Demonstration device for relation between flow velocity and pressure intensity of fluid

Abstract

The utility model provides a fluid flow velocity and pressure relation demonstration device, and belongs to the technical field of experiment teaching aids. The problem that an existing experiment teaching aid cannot be adsorbed on a blackboard is solved. The fluid flow rate and pressure relation demonstration device comprises a U-shaped pipe and an upper cover body, the upper cover body is provided with two through holes for the U-shaped pipe to penetrate through, one through hole is provided with a protruding block, and the U-shaped pipe is provided with a magnetic attraction device used for attracting the U-shaped pipe to a blackboard. The blackboard eraser has the advantages of being capable of being adsorbed on a blackboard, facilitating demonstration of teachers and the like.

Description

Technical Field

[0001] The utility model belongs to the technical field of experimental teaching aids, and particularly relates to a device for demonstrating the relationship between fluid flow rate and pressure. Background Art

[0002] In junior high school physics teaching, we will talk about the relationship between fluid pressure and flow rate. The faster the gas flow rate, the lower the gas pressure; the gas will flow from places with high pressure to places with low pressure, and the flow process will drive objects to move; in order to strengthen teaching, experiments are often used to help students understand. In order to allow students in the back row to see the experiment clearly, the teaching aids need to be raised, and sometimes students need to help lift them, which is more troublesome. Summary of the Invention

[0003] The purpose of the utility model is to provide a device for demonstrating the relationship between fluid flow rate and pressure in order to solve the above problems existing in the prior art.

[0004] The purpose of the utility model can be achieved through the following technical solutions: a device for demonstrating the relationship between fluid flow rate and pressure, characterized in that it includes a U-shaped tube and an upper cover body, the upper cover body is provided with two through holes for the U-shaped tube to pass through, one of the through holes is provided with a protrusion, and the U-shaped tube is provided with a magnetic suction device for adsorbing the U-shaped tube on a blackboard.

[0005] The working principle of the utility model is as follows: when a teacher needs to demonstrate an experiment, he or she first places a lightweight ping-pong ball or a foam ball in the U-shaped tube, adsorbs the U-shaped tube on the blackboard through a magnetic device, and uses a blower to blow air at the outlet of the U-shaped tube. Since a convex block is provided at one of the through holes, the flow velocity at the through hole is accelerated and the pressure is reduced, causing the lightweight ping-pong ball or the foam ball to fly out of the through hole.

[0006] In the above-mentioned fluid flow rate and pressure relationship demonstration device, the magnetic device includes a plurality of magnetic blocks, and the magnetic blocks are detachably connected to the U-shaped tube.

[0007] In the above-mentioned fluid flow rate and pressure relationship demonstration device, three magnetic blocks are provided.

[0008] In the above-mentioned fluid flow rate and pressure relationship demonstration device, the magnetic block includes a connecting block and a magnet, one end of the connecting block is provided with an arc-shaped groove connecting to the U-shaped tube, and the other end of the connecting block is provided with a clearance groove for installing the magnet.

[0009] In the above-mentioned fluid flow rate and pressure relationship demonstration device, the connecting block is provided with a weight-reducing port.

[0010] In the above-mentioned fluid flow rate and pressure relationship demonstration device, a weight-reducing groove is provided on the bottom surface of the upper cover body.

[0011] In the above-mentioned fluid flow rate and pressure relationship demonstration device, reinforcing ribs are provided in the weight-reducing groove.

[0012] In the above-mentioned fluid velocity and pressure relationship demonstration device, the protrusion is in a truncated cone shape.

[0013] Compared with the prior art, the utility model has the advantage of being able to be adsorbed on the blackboard, making it convenient for teachers to demonstrate. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural diagram of the present utility model.

[0015] Figure 2 It is a structural schematic diagram of the weight-reducing trough of the utility model.

[0016] Figure 3 It is a structural schematic diagram of the magnetic attraction block of the utility model.

[0017] In the figure, 1. U-shaped tube; 2. upper cover; 3. through hole; 4. protrusion; 5. magnetic device; 6. magnetic block; 7. connecting block; 8. magnet; 9. arc-shaped groove; 10. clearance groove; 11. weight-reducing opening; 12. weight-reducing groove; 13. reinforcing rib. DETAILED DESCRIPTION

[0018] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0019] like Figure 1-Figure 3 As shown, the fluid flow rate and pressure relationship demonstration device includes a U-shaped tube 1 and an upper cover 2. The upper cover 2 is provided with two through holes 3 for the U-shaped tube 1 to pass through, one of the through holes 3 is provided with a protrusion 4, and the U-shaped tube 1 is provided with a magnetic suction device 5 for adsorbing the U-shaped tube 1 on the blackboard.

[0020] In further detail, the magnetic device 5 includes a plurality of magnetic blocks 6, which are detachably connected to the U-shaped tube 1. By adsorbing the plurality of magnetic blocks 6 on the blackboard, the stability of the U-shaped tube 1 can be ensured.

[0021] To elaborate further, three magnetic blocks 6 are provided, and the three magnetic blocks 6 are respectively located at the bottom of the U-shaped tube 1 and on the side walls of the tube on both sides, thereby increasing the stability of the U-shaped tube 1 when it is adsorbed on the blackboard.

[0022] To elaborate further, the magnetic block 6 includes a connecting block 7 and a magnet 8. One end of the connecting block 7 is provided with an arc-shaped groove 9 for connecting to the U-shaped tube 1, and the other end of the connecting block 7 is provided with a makeshift groove 10 for installing the magnet 8. The magnetic block 6 is detachably connected to the U-shaped tube 1, which is convenient for installation and replacement.

[0023] In further detail, the connection block 7 is provided with a weight-reducing opening 11 , which is used to reduce the weight of the connection block 7 .

[0024] In further detail, a weight-reducing groove 12 is provided on the bottom surface of the upper cover body 2, which is used to reduce the weight of the upper cover.

[0025] In further detail, a reinforcing rib 13 is provided in the weight-reducing groove 12 , which is used to increase the supporting strength of the upper cover body 2 .

[0026] To elaborate further, the protrusion 4 is in a truncated cone shape. Setting the protrusion 4 in a truncated cone shape has the advantage of increasing the flow velocity at the through hole 3, making the experimental phenomenon more obvious.

[0027] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope defined by the appended claims.

[0028] Although a large number of terms are used in this article, the possibility of using other terms is not excluded. These terms are used only to more conveniently describe and explain the essence of the present invention; interpreting them as any additional restrictions is contrary to the spirit of the present invention.

Claims

1. A device for demonstrating the relationship between fluid flow rate and pressure, characterized in that: The invention comprises a U-shaped tube (1) and an upper cover (2), wherein the upper cover (2) is provided with two through holes (3) for the U-shaped tube (1) to pass through, wherein a protrusion (4) is provided at one of the through holes (3), and the U-shaped tube (1) is provided with a magnetic suction device (5) for adsorbing the U-shaped tube (1) on a blackboard.

2. A fluid velocity and pressure relationship demonstration device according to claim 1, characterized in that: The magnetic attraction device (5) comprises a plurality of magnetic attraction blocks (6), and the magnetic attraction blocks (6) are detachably connected to the U-shaped tube (1).

3. A fluid velocity and pressure relationship demonstration device according to claim 2, characterized in that: The number of magnetic blocks (6) is three.

4. A fluid velocity and pressure relationship demonstration device according to claim 3, characterized in that: The magnetic attraction block (6) comprises a connecting block (7) and a magnet (8); one end of the connecting block (7) is provided with an arc-shaped groove (9) for connecting to the U-shaped tube (1); the other end of the connecting block (7) is provided with a clearance groove (10) for installing the magnet (8).

5. A fluid velocity and pressure relationship demonstration device according to claim 4, characterized in that: The connection block (7) is provided with a weight-reducing opening (11).

6. A fluid velocity and pressure relationship demonstration device according to claim 1, characterized in that: The bottom surface of the upper cover body (2) is provided with a weight-reducing groove (12).

7. A fluid velocity and pressure relationship demonstration device according to claim 6, characterized in that: A reinforcing rib (13) is arranged in the weight-reducing groove (12).

8. A fluid velocity and pressure relationship demonstration device according to claim 1, characterized in that: The projection (4) is in the shape of a truncated cone.

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