Luruss flame tube for teaching

Abstract

The utility model relates to a teaching Rubens flame tube comprising a tube body, one end of the tube body is closed and set as a closed end, and the other end of the tube body is open and set as an open end; a plurality of small air outlet holes are formed in the peripheral surface of the top of the pipe body; a plurality of air inlet holes are formed in the peripheral surface of the bottom of the pipe body; the air inlet assembly comprises an air inlet joint and an air supply pipe, and the inner diameter of the air supply pipe is gradually increased; the vibrating membrane is mounted on the open end of the tube body; the sound source is mounted on the sliding rod and directly faces the vibrating diaphragm; according to the gas inlet assembly of the rubelius flame tube for teaching, a divergent tree-shaped distributed pipeline network is adopted for gas supply, branches of a gas pipeline are increased, the inner diameter of the pipeline is gradually increased, gas in the tube body is uniformly distributed and the gas pressure is stable before an experiment, and during the experiment, the gas pressure in the tube body is regularly distributed due to interference, so that the experiment efficiency is improved. The flame size changes regularly, and interference waveforms can be presented accurately.

Description

Technical Field

[0001] This utility model relates to the field of physics teaching demonstration equipment technology, specifically a Rubens flame tube for teaching, used to study the interference phenomenon of sound waves. Background Technology

[0002] The Rubens tube, invented by German physicist Heinrich Rubens in 1905, works based on the principle of sound wave interference. The device consists of a metal tube, closed at both ends, with a row of small holes on its upper surface. When combustible gas is filled into the tube and overflows through the holes, it ignites, forming a row of flames. When sound waves propagate from one end of the tube to the other and are reflected, the incident and reflected waves superimpose inside the tube, producing an interference effect that causes uneven gas pressure distribution. This uneven pressure distribution results in varying flame heights at different holes; holes with higher pressure have higher flames, and vice versa. The flames appear to dance with the sound waves, but this method cannot accurately demonstrate interference waveforms, and the regularity of the flame distribution is not obvious. Therefore, it is not suitable for classroom teaching or quantitative experimental research.

[0003] Current technology cannot perfectly reproduce the waveform of sound wave interference, and the representation of antinodes and nodes is not obvious. This is because the design of gas pipelines in current technology is relatively simple, usually allowing combustible gas to be directly introduced into the pipe from one end or the middle. This design results in significantly higher gas pressure and velocity at the gas inlet than elsewhere, leading to uneven distribution of gas pressure and velocity within the pipe. This uneven distribution affects the sound wave interference effect, preventing the gas pressure within the pipe from exhibiting a regular distribution after interference. Secondly, unevenness of the reflecting surface inside the pipe also affects the sound wave interference effect; and the diaphragm is not sensitive enough to accurately reflect the vibration of the sound source.

[0004] In summary, all of the above factors can lead to distortion of the interference waveform or experimental failure. Therefore, when designing and using Rubens flame tubes, these factors need to be fully considered, and corresponding measures should be taken to improve and optimize the design of the device. Utility Model Content

[0005] The technical problem to be solved by this utility model is to address the shortcomings of the existing technology by providing a divergent air intake assembly with an ever-increasing inner diameter and composed of multiple branches, which reduces the pressure and speed of the gas, uses multiple air intake holes to improve the uniformity of air intake, and uses a polydimethylsiloxane film as a vibrating diaphragm for the flame tube.

[0006] The technical problem to be solved by this utility model is achieved through the following technical solution: a Rubens flame tube for teaching, comprising;

[0007] The tube body has one end closed and is set as a closed end, and the other end open and is set as an open end. The top outer circumferential surface of the tube body has several small air outlet holes, and the bottom circumferential surface of the tube body has several air inlet holes.

[0008] The intake assembly includes an intake connector and an air supply pipe. The intake connector is installed on the intake port. The air supply pipe is connected to the intake connector through a pipe. The pipe connected to the intake connector is the first-stage pipe, and the pipe connected to the air supply pipe is the final-stage pipe. Each stage pipe between the first-stage pipe and the final-stage pipe is connected in parallel with two pipes in the previous stage pipe, forming a divergent tree-like pipe network.

[0009] A vibrating diaphragm is installed on the open end of the tube to seal the open end of the tube.

[0010] The sound source is mounted on the tube and directly opposite the vibrating diaphragm.

[0011] The technical problem to be solved by this utility model can also be achieved through the following technical solution: the Rubens flame tube for teaching described above, wherein the vibrating diaphragm is a polydimethylsiloxane film.

[0012] The technical problem to be solved by this utility model can also be achieved through the following technical solution: the Rubens flame tube for teaching described above has a sliding rod tied to the outer circumference of the open end of the tube body by a steel wire, one end of the sliding rod extending to the open end of the tube body, and the sound source is a horn fixed to the end of the sliding rod.

[0013] The technical problem to be solved by this utility model can also be achieved through the following technical solution: the Rubens flame tube for teaching described above, wherein the tube body is a stainless steel tube with a polished surface.

[0014] The technical problem to be solved by this utility model can also be achieved through the following technical solution: the Rubens flame tube for teaching described above has a polished stainless steel flange fixed at the closed end of the tube body.

[0015] The technical problem to be solved by this utility model can also be achieved through the following technical solution: the Rubens flame tube for teaching described above has an even number of air inlets.

[0016] The technical problem to be solved by this utility model can also be achieved through the following technical solution: the Rubens flame tube for teaching described above has a bracket fixedly provided on the bottom outer circumferential surface at both ends of the tube body, and the bracket is set perpendicular to the tube body.

[0017] Compared with the prior art, the beneficial technical effects of this utility model are as follows:

[0018] (1) The air intake assembly of a Rubens flame tube for teaching uses a divergent tree-like distribution of pipe network for gas supply, which increases the branches of the gas pipeline, so that the gas inside the tube is evenly distributed and the gas pressure is stable, which is conducive to forming a stable interference waveform.

[0019] (2) The diaphragm is made of polydimethylsiloxane film, which has good resilience and is sensitive to vibration, and can transmit the vibration of the speaker in real time;

[0020] (3) The surface of the stainless steel flange is polished and perpendicular to the central axis of the pipe body to ensure that the incident wave is reflected at the same time, and the reflected sound wave and the incident sound wave are better superimposed. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the main structure of this utility model.

[0022] Reference numerals in the attached diagram: 1. Pipe body; 2. Stainless steel flange; 3. Air outlet hole; 4. Air inlet hole; 5. Support; 6. Variable diameter joint; 7. Air supply pipe; 8. Pipe; 9. T-joint; 10. Pagoda elbow; 11. Variable diameter pagoda elbow; 12. Sliding rod; 13. Vibrating diaphragm; 14. Sound source; 15. Steel wire. Detailed Implementation

[0023] The specific technical solutions of this utility model are further described below with reference to the accompanying drawings, so as to enable those skilled in the art to further understand this utility model, without constituting a limitation on its rights.

[0024] Example 1, referring to Figure 1 A Rubens flame tube for teaching purposes, comprising:

[0025] The tube body 1 is a polished stainless steel tube with one end closed and the other end open. A polished stainless steel flange 2 is fixed at the closed end of the tube body 1. The polished stainless steel flange 2 reflects the incident wave simultaneously in different areas, resulting in good interference effect. The top outer circumference of the tube body 1 has several small air outlet holes 3, which are equidistantly arranged. The bottom circumference of the tube body 1 has several air inlet holes 4, which are an even number and are equidistantly arranged. When air is introduced, the gas enters each air inlet hole 4 simultaneously.

[0026] In addition, the end face of the stainless steel flange 2 is perpendicular to the axis of the pipe body 1, so that the incident wave is reflected simultaneously through different areas of the surface of the stainless steel flange 2, resulting in a good interference effect.

[0027] To facilitate the support of the tube body 1, we fix brackets 5 on the bottom outer circumference of both ends of the tube body 1. The brackets 5 are set perpendicular to the tube body 1 and can be constructed from profiles.

[0028] The intake assembly includes an intake connector and an air supply pipe 7. One end of the air supply pipe 7 can be supplied with gas from the outside. The intake connector is installed on the intake port 4. The air supply pipe 7 is connected to the intake connector through a pipe 8. The pipe 8 is a silicone tube. The pipe 8 connected to the intake connector is the first-stage pipe 8, and the pipe 8 connected to the air supply pipe 7 is the final-stage pipe 8. Each stage pipe 8 between the first-stage pipe 8 and the final-stage pipe 8 is connected in parallel with two pipes 8 in the previous stage pipe 8. A tee connector 9 can be installed at the parallel connection point to form a tree-like network of pipes 8 radiating from the air supply pipe 7.

[0029] It should be noted that the inlet connector is a variable diameter butt joint 6. Additionally, we have installed a pagoda elbow 10 and a variable diameter pagoda elbow 11 on pipe 8. The variable diameter pagoda elbow 11 is threaded onto the variable diameter butt joint 6. The primary pipe 8 is connected to the variable diameter pagoda elbow 11. The pagoda elbow 10 is located on pipe 8 away from the primary pipe 8. The inner diameter of the inlet end of the variable diameter butt joint 6 and the variable diameter pagoda elbow 11 is smaller than the inner diameter of the outlet end. This means that the pipe's inner diameter increases as the gas passes through the variable diameter pagoda elbow 11, continues to increase as it enters the variable diameter butt joint 6, and finally increases again when it enters the stainless steel pipe, causing the gas flow velocity to continuously decrease. The number of divergent, tree-like pipe branches increases, further reducing the gas flow velocity.

[0030] A diaphragm 13 is installed on the open end of the tube body 1 to seal the open end of the tube body 1. The diaphragm 13 is a polydimethylsiloxane film. The diaphragm 13 made of this material has high mechanical strength, good resilience, and sensitive vibration, and can transmit the vibration of the speaker with high fidelity.

[0031] The sound source 14 is mounted on the slide bar 12 and faces the diaphragm 13. The sound source 14 can be a Bluetooth speaker, which is a prior art technology.

[0032] To facilitate the movement of the sound source 14, a sliding rod 12 is bound to the outer circumference of the open end of the tube body 1 by a steel wire 15. The sliding rod 12 is formed into a roughly rod-shaped structure, and the sliding rod 12 is parallel to the axis of the tube body 1. One end of the sliding rod 12 extends to the open end of the tube body 1. The sound source 14 is a horn fixed to the end of the sliding rod 12.

[0033] The specific steps of the demonstration of sound wave interference experiment using a Rubens flame tube for teaching in Example 1 are as follows:

[0034] (1) First check the air tightness. Seal all the air outlets 3 on the tube body 1 with a wide tape. Then, fill the tube body 1 with a certain amount of air through the air inlet assembly. You can see the vibrating diaphragm 13 bulging. Observe whether there is any air leakage. If there is any air leakage, use soapy water to check for the leak and repair it.

[0035] (2) Tear off the wide tape on the small hole, introduce gas into the gas supply pipe 7, and ignite the gas overflowing from the gas outlet 3. It can be seen that the flame at each small hole is almost the same size and burns stably.

[0036] (3) Input a certain frequency audio signal to the sound source 14, i.e., the Bluetooth speaker, adjust the speaker volume, and adjust the distance between the sound source 14 and the diaphragm 13. The vibration of the speaker drives the air to vibrate, which in turn drives the diaphragm 13 to vibrate, generating sound waves inside the flame tube, i.e. the tube body 1. When the sound waves propagate to the stainless steel flange 2 inside the flame tube, they are reflected. The reflected wave and the incident wave are superimposed inside the flame tube, i.e. the tube body 1, resulting in interference. This causes the air pressure inside the flame tube to be uneven and to show a regular distribution. The size of the flame in the small hole 3 changes with the air pressure: the flame in some small holes becomes larger, the flame in some small holes becomes smaller, and the flame in some small holes goes out. The position of the small hole where the flame is largest is the antinode, and the position of the small hole where the flame goes out is the node. That is, the flame shows a regular distribution, which can present a stable interference waveform for students.

[0037] (4) Understanding interference phenomena. Recognize the antinodes and nodes in interference waveforms, and analyze the principle of acoustic wave interference;

[0038] (5) Quantitatively study the relationship between frequency, wavelength, and wave speed. By measuring the distance between two adjacent antinodes or nodes, the wavelength can be calculated, and then the wave speed can be determined;

[0039] (6) Qualitatively displaying interference waveforms. When a song is played through speaker 14, the flames jump with the rhythm of the music, presenting a variety of beautiful and ever-changing waveforms, rising and falling in an instant;

[0040] (7) Analyze the factors affecting the interference effect. Analyze the specific effects of gas pipeline design, the flatness of the internal reflective surface, and the sensitivity of the vibrating diaphragm 13 on the experimental results;

[0041] (8) After the experiment, first turn off the gas and ensure that the flame is completely extinguished. Then turn off the sound source 14, disconnect all connecting pipes 8, restore the device to its initial state, and finally clean and maintain the device as necessary for the next use.

[0042] Through the above steps, a Rubens flame tube for teaching can intuitively demonstrate the interference waveform of sound waves, analyze the principle of interference, recognize antinodes and nodes, quantitatively study the relationship between wavelength, wave speed and frequency for classroom teaching, qualitatively display the waveform when playing songs for popular science activities, and analyze the factors that affect the interference effect.

Claims

1. A Rubens flame tube for teaching purposes, characterized in that: It includes; The tube body has one end closed and is set as a closed end, and the other end open and is set as an open end. The top outer circumferential surface of the tube body has several small air outlet holes, and the bottom circumferential surface of the tube body has several air inlet holes. The intake assembly includes an intake connector and an air supply pipe. The intake connector is installed on the intake port. The air supply pipe is connected to the intake connector through a pipe. The pipe connected to the intake connector is the first-stage pipe, and the pipe connected to the air supply pipe is the final-stage pipe. Each stage pipe between the first-stage pipe and the final-stage pipe is connected in parallel with two pipes in the previous stage pipe, forming a divergent tree-like pipe network. A vibrating diaphragm is installed on the open end of the tube to seal the open end of the tube. The sound source is mounted on the tube and directly opposite the vibrating diaphragm.

2. The Rubens flame tube for teaching purposes according to claim 1, characterized in that: The vibrating diaphragm is a polydimethylsiloxane film.

3. The Rubens flame tube for teaching purposes according to claim 1, characterized in that: A sliding rod is bound to the outer circumference of the open end of the tube by a steel wire. One end of the sliding rod extends to the open end of the tube. The sound source is a horn fixed to the end of the sliding rod.

4. A Rubens flame tube for teaching purposes according to claim 1, characterized in that: The tube body is a stainless steel tube with a polished surface.

5. A Rubens flame tube for teaching purposes according to claim 1, characterized in that: A polished stainless steel flange is fixed at the closed end of the pipe.

6. A Rubens flame tube for teaching purposes according to claim 1, characterized in that: The number of air inlets is an even number.

7. A Rubens flame tube for teaching purposes according to claim 1, characterized in that: Supports are fixed on the bottom outer circumference of both ends of the tube, and the supports are set perpendicular to the tube.

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