Soap film gas flow standard measuring device and method with automatic foaming and automatic measuring functions

Abstract

The invention provides an automatic foaming and automatic measuring soap film gas flow standard measuring device and method, and belongs to the technical field of gas flow measurement. The device comprises a liquid soap pool, a soap film pipe, a film lifting pipe, a connecting pipe, a pipettor, a single chip microcomputer and the like. The liquid soap pool is used for storing liquid soap, the soap film pipe is installed above the liquid soap pool, the film lifting pipe is used for generating and conveying a soap film, the pipettor is used for accurately controlling the liquid level in the film lifting pipe, and the single-chip microcomputer serves as a control center and is in communication connection with the sensors and the actuator. The specific measurement process comprises the stages of initial preparation, automatic wetting of the pipe wall of the soap film, automatic measurement, continuous measurement and the like, gas flow is accurately measured by automatically controlling generation, movement and breakage of the soap film and combining data of multiple sensors, errors caused by manual operation and foam residues of a traditional soap film flowmeter are avoided, and the measurement accuracy is improved. And high-precision and high-efficiency gas flow measurement is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of gas flow measurement, and particularly relates to a standard soap film gas flow measurement device and method with automatic foaming and automatic measurement. Background Art

[0002] A soap film flowmeter is a soap film tube with upper and lower scales. There is an air inlet at the lower end of the soap film tube, and the lowermost end of the soap film tube is a soap liquid storage device and a film-forming device. An electronic soap film flowmeter is respectively equipped with photoelectric sensors on the outer walls at the upper and lower scales of the soap film tube and is equipped with a display instrument.

[0003] During operation, gas enters the soap film tube from the air inlet at the lower end of the soap film tube, generates a soap film through the film-forming device, and the entering gas medium pushes the soap film to rise uniformly along the soap film tube. When the soap film rises to the lower scale line of the soap film tube, the lower limit photoelectric sensor detects a signal and the timer starts timing. When the soap film rises to the upper scale line of the soap film tube, the upper limit photoelectric sensor detects a signal and the timer stops timing. The instantaneous flow rate through the soap film flowmeter is calculated through data processing based on the measured time and the volume between the two scale lines of the soap film tube, and the display instrument directly displays the instantaneous flow rate.

[0004] In the prior art, the design of a soap film flowmeter usually has gas entering from the bottom of the soap film tube, pushing the soap film to move upward along the soap film tube from bottom to top. This upward movement direction causes the soap film to maintain a certain shape during formation and rising due to the pushing action of the gas and the surface tension of the liquid. However, once the foam breaks or is disturbed by an external force (such as the action of a large-flow air current), they will lose their original shape, become smaller bubbles or droplets, and slide down along the inner wall of the soap film tube. When the foam contacts the inner wall, it may stay on the inner wall due to adhesion. The foam adhering to the inner wall of the soap film tube will change the contact state between the soap film and the inner wall and reduce the volume of the soap film tube, thereby affecting the movement speed and shape of the soap film, resulting in errors when the photoelectric sensor detects the passing of the soap film, and further affecting the accuracy of flow measurement.

[0005] In addition, in the prior art, the processes of film formation, measurement, and data processing of a soap film flowmeter mostly rely on manual operation and cannot achieve automation. The lack of an automated film formation and measurement mechanism results in low efficiency of the measurement process and is easily affected by human operation errors.

[0006] Therefore, it is of great significance to design a standard soap film gas flow measurement device and method with automatic foaming and automatic measurement to solve the above problems. Summary of the Invention

[0007] To solve the problems existing in the background art, the present invention provides a standard measuring device for soap film gas flow with automatic foaming and automatic measurement, which comprises the following structures:

[0008] A soap solution pool, on which a soap film tube is installed and an air outlet is provided;

[0009] A soap film tube installed above the soap solution pool. The soap film tube is a vertical circular pipe, and the bottom of the pipe is communicated with the soap solution pool; upper and lower scale lines are provided on the soap film tube, and a first photoelectric sensor and a second photoelectric sensor are respectively installed on both sides of the upper and lower scale lines to detect the moment when the soap film passes through and transmit the signal to the single-chip microcomputer;

[0010] A film-forming tube for generating and transporting the soap film. In the internal cavity of the film-forming tube, there are a soap film inlet tube, a first air inlet, a liquid level detection tube and a liquid inlet communicating with it; the liquid inlet is arranged at the lower end of the film-forming tube; the liquid level detection tube is communicated with the inside of the film-forming tube and is used to monitor the position of the liquid level; a liquid level sensing device is installed on the liquid level detection tube at the same horizontal position as the soap film inlet to monitor the liquid level position in the film-forming tube; after the gas enters the film-forming tube through the first air inlet, it pushes the soap film to rise from the soap film inlet tube;

[0011] A connecting tube connecting the soap film channels of the film-forming tube and the soap film tube, and transporting the gas and the soap film from the film-forming tube to the soap film tube;

[0012] A pipette, which is a liquid transfer device that can move the liquid level up and down on the film-forming tube or stop the liquid level at a certain position. It is connected with a soap solution bottle at the lower part and is connected with the liquid inlet of the film-forming tube at the upper part. The pipette transports the soap solution in the soap solution bottle to the film-forming tube and enables the liquid level in the film-forming tube to quickly rise to the lower end face of the soap film inlet tube or drop away from the soap film inlet tube, so as to generate a soap film meeting the measurement requirements in the soap film inlet tube;

[0013] A single-chip microcomputer, which is communicatively connected with the pipette, the liquid level sensing device, the first photoelectric sensor and the second photoelectric sensor, controls the start (raising or lowering the liquid level) and stop of the pipette according to the signal of the liquid level sensing device, and receives the signals of the first photoelectric sensor and the second photoelectric sensor to calculate the instantaneous flow rate.

[0014] The above combination of the single-chip microcomputer, the pipette, the film-forming tube and the liquid level sensing device completes the automatic film-forming function.

[0015] In a preferred solution, a liquid discharge port is provided at the bottom of the soap solution pool. The liquid discharge port is connected with the soap solution bottle, and a first valve is provided on the connecting tube; a temperature sensor, a pressure sensor and a moisture content sensor communicatively connected with the single-chip microcomputer are installed above the inside of the soap solution pool; the single-chip microcomputer receives the data of the temperature sensor, the pressure sensor and the moisture content sensor to perform the conversion of flow rate values in different states.

[0016] In a preferred embodiment, the upper end of the film-forming tube is made into a "T" shape, and a second air inlet is provided. A second valve is provided at the second air inlet. When the gas flow rate is large, the second valve is in the "ventilated" state, so that a part of the gas enters the soap film tube from the second air inlet, thereby reducing the gas flow rate through the first air inlet and facilitating the generation of an ideal soap film. When measuring the flow rate, the second valve is in the closed state.

[0017] In a preferred embodiment, the single-chip microcomputer is communicatively connected to a display screen and a keyboard. The display screen displays the measurement results, including the instantaneous flow rate, measurement time, temperature, and pressure data. Input operation instructions and parameter settings are performed through the keyboard.

[0018] A method for measuring the flow rate using an automatic foaming and automatic measuring soap film gas flow standard measuring device includes the following steps:

[0019] S1. Initial preparation stage: Check the film-forming tube to ensure that the liquid level of the soap solution in the film-forming tube remains below the soap film inlet tube and no soap film is formed.

[0020] S2. Automatic wetting of the soap film tube wall stage, including:

[0021] S21. The pipette extracts the soap solution from the soap solution bottle and controls the liquid level in the film-forming tube to quickly rise to the lower end face of the soap film inlet tube.

[0022] S22. The gas enters the film-forming tube through the first air inlet. Under the push of the gas, the soap solution generates a soap film at the soap film inlet tube of the film-forming tube and moves along the film-forming tube.

[0023] S23. Wetting the tube wall stage: The soap film moves in the soap film tube. Initially, it will break successively, but with the continuous supply of the soap solution, the entire inner wall of the soap film tube will gradually be wetted by the soap film (soap solution); until the complete soap film runs to the lower end of the soap film tube and breaks in the soap solution pool, and the foam remains in the soap solution pool. At this point, the inner wall of the soap film tube is completely wet and can enter the normal flow rate measurement stage.

[0024] S3. Automatic measurement stage, including:

[0025] S31. The gas enters the film-forming tube through the first air inlet. The pipette extracts the soap solution from the soap solution bottle and controls the liquid level in the film-forming tube to quickly rise to the lower end face of the soap film inlet tube. After the liquid level sensing device installed on the liquid level detection tube detects the liquid level signal, the single-chip microcomputer controls the pipette to quickly lower the liquid level away from the lower end face of the soap film inlet tube, thereby forming a single complete soap film.

[0026] S32. The gas pushes the complete soap film to move along the film-forming tube, enters the soap film tube through the connecting tube, and the soap film moves downward in the soap film tube until it moves to the lower end of the soap film tube and enters the soap solution pool, and the foam remains in the soap solution pool;

[0027] S33. When the soap film passes through the first photoelectric sensor, the sensor transmits the detected signal to the single-chip microcomputer, and the timer of the single-chip microcomputer starts timing; when the soap film continues to move to the second photoelectric sensor, the sensor transmits the signal to the single-chip microcomputer and the timing stops;

[0028] S34. The single-chip microcomputer calculates the instantaneous flow rate of the gas flowing through the soap film flowmeter according to the movement time of the soap film between the first photoelectric sensor and the second photoelectric sensor and the volume between the two scale lines of the soap film tube;

[0029] S35. The single-chip microcomputer combines the data measured by the temperature sensor, the pressure sensor and the moisture content sensor to perform the conversion of the flow rate in different states; the calculated instantaneous flow rate, temperature and pressure data are displayed on the display screen;

[0030] S4. Continuous measurement, including:

[0031] Repeat steps S31 - S35 to perform continuous flow rate measurement.

[0032] In the preferred solution, the specific process of step S31 is as follows:

[0033] The liquid level sensing device transmits the liquid level information to the single-chip microcomputer, and the single-chip microcomputer controls the pipette to extract the soap solution from the soap solution bottle according to the liquid level information and injects the soap solution into the film-forming tube; the pipette precisely controls the injection amount of the soap solution to raise the liquid level in the film-forming tube to the soap film inlet tube, the liquid level sensing device detects the liquid level change and transmits the signal to the single-chip microcomputer, and the single-chip microcomputer immediately stops the soap solution injection operation of the input device and controls the pipette in the reverse direction to quickly lower the liquid level in the film-forming tube away from the soap film inlet tube. Thus, the gas pushes the soap solution to form a complete soap film in the film-forming tube without continuously generating multiple soap films.

[0034] The beneficial effects achieved by the present invention are as follows:

[0035] Through the collaborative work of the input device and the liquid level sensing device, the present invention changes the method of generating soap films of traditional soap film flowmeters, saves labor, and realizes the functions of automatic film formation and automatic measurement. The input device can precisely control the liquid level in the film-forming tube to quickly rise or fall, thereby generating or stopping the generation of soap films. The liquid level sensing device monitors the liquid level change in real time to ensure that the liquid level is in the appropriate position and avoid continuously generating multiple soap films, which affects the measurement accuracy.

[0036] During the automatic measurement process, the optoelectronic sensor detects the moment when the soap film passes through and transmits the signal to the single-chip microcomputer. The single-chip microcomputer calculates the instantaneous flow rate based on the time for the soap film to pass between the two optoelectronic sensors and the volume of the soap film tube, and performs the conversion of flow rates in different states in combination with the data measured by sensors such as temperature and pressure. Finally, the result is displayed on the display screen. This process is completely automated, reducing human operation errors and improving the measurement accuracy and efficiency.

[0037] Before measurement, the present invention ensures sufficient wetting inside the soap film tube through the stage of automatically wetting the soap film tube wall. The input device controls the liquid level in the film-forming tube to rise rapidly to the soap film inlet tube and maintains the liquid level stable, continuously generating multiple soap films until the entire pipeline is wetted. This process avoids the rupture of the soap film caused by the dryness inside the pipeline, ensuring the integrity and stability of the soap film during the measurement process.

[0038] With the design of the soap film moving from top to bottom in the present invention, the foam accompanying the soap film or the foam formed after the rupture of the soap film can quickly flow into the soap solution pool under the action of gravity and the push of the next soap film, avoiding the formation of a covering layer by the foam staying on the inner wall of the soap film tube and affecting subsequent measurements. This design reduces the waiting time for the foam to slide down and also reduces mismeasurements.

[0039] After the soap film is formed, the input device quickly lowers the liquid level away from the soap film inlet tube to prevent the continuous generation of multiple soap films, further improving the measurement accuracy and efficiency.

[0040] The present invention automatically processes the data of the optoelectronic sensor, temperature sensor, pressure sensor, and moisture content sensor by the single-chip microcomputer, realizes the conversion of flow rates in different states, and displays the result on the display screen in real time, reducing human calculation errors and improving the measurement accuracy and convenience. At the same time, it supports the continuous measurement function, can work continuously for a long time, and is applicable to a variety of measurement scenarios. Brief Description of the Drawings

[0041] Figure 1 is the overall structural schematic diagram of the present invention.

[0042] Reference Numerals in the Figures:

[0043] 1. Soap solution pool; 101. Air outlet; 102. Liquid discharge port; 103. First valve; 2. Soap film tube; 201. First optoelectronic sensor; 202. Second optoelectronic sensor; 3. Film-forming tube; 301. First air inlet; 302. Liquid level detection tube; 303. Liquid level induction device; 304. Soap film inlet tube; 305. Liquid inlet; 4. Connecting tube; 5. Second valve; 6. Second air inlet; 7. Pipette; 8. Soap solution bottle; 9. Single-chip microcomputer; 10. Atmospheric pressure sensor; 11. Ambient temperature sensor; 12. Display screen; 13. Keyboard; 14. Temperature sensor; 15. Pressure sensor; 16. Moisture content sensor. Detailed implementation manners

[0044] The technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the present invention. In addition, the forms of the various structures described in the following embodiments are merely examples, and the present invention is not limited to the various structures described in the following embodiments. All other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0045] Referring to Figure 1 , the detailed structural composition of an automatic foaming and automatic measuring soap film gas flow standard measuring device of the present invention is as follows:

[0046] Soap liquid pool 1, which is used to store soap liquid and provide raw materials for the generation of soap film. A soap film tube 2 is installed on the soap liquid pool 1, and an air outlet 101 is provided for discharging gas. A liquid discharge port 102 is provided at the bottom of the soap liquid pool 1, and the liquid discharge port 102 is connected to a soap liquid bottle 8 to facilitate the replacement or replenishment of soap liquid.

[0047] Soap film tube 2, which is installed above the soap liquid pool 1 and is a vertical circular pipe. Its bottom is connected to the soap liquid pool 1. Upper and lower scale lines are provided on the soap film tube 2 for measuring the rising height of the soap film, so as to calculate the gas flow rate. First photoelectric sensors 201 and second photoelectric sensors 202 are respectively installed on both sides of the upper and lower scale lines for detecting the moment when the soap film passes and transmitting signals to the single-chip microcomputer 9.

[0048] Film forming tube 3, which is used to generate and convey soap film. A soap film inlet tube 304, a first air inlet 301, a liquid level detection tube 302 and a liquid inlet 305 communicating with it are provided in its internal cavity. The liquid inlet 305 is arranged at the lower end of the film forming tube 3 and is connected to a pipette 7 for injecting soap liquid into the film forming tube 3. The liquid level detection tube 302 is internally connected to the film forming tube 3 for monitoring the position of the liquid level. A liquid level sensing device 303 is installed on the liquid level detection tube 302 at the same horizontal position as the soap film inlet for monitoring the liquid level position in the film forming tube 3. After the gas enters the film forming tube 3 through the first air inlet 301, it pushes the soap film to rise from the soap film inlet tube 304.

[0049] The upper end of the film forming tube 3 is made into a "T" shape, and a second air inlet 6 is provided, and a second valve 5 is provided at the second air inlet 6. When the gas flow rate is large, the second valve 5 is in a ventilation state, so that a part of the gas enters the soap film tube 2 from the second air inlet 6, thereby reducing the gas flow rate through the first air inlet 301 and making it easy to generate an ideal soap film. When measuring the flow rate, the second valve 5 is in a closed state.

[0050] When the gas flow rate is relatively large, by opening the second valve 5, part of the gas enters the soap film tube 2 from the second air inlet 6, thereby reducing the gas flow rate through the first air inlet 301. This helps to stabilize the soap film generation process, avoid soap film rupture or instability caused by excessive flow rate, and ensure the accuracy and reliability of the measurement.

[0051] When measuring the flow rate, close the second valve 5 to allow the gas to enter the film-forming tube 3 only through the first air inlet 301, which is convenient for precisely controlling the gas flow rate, generating a soap film that meets the measurement requirements, and improving the measurement accuracy.

[0052] By controlling the opening and closing state of the second valve 5, the gas flow rate entering the film-forming tube 3 can be flexibly adjusted to adapt to different measurement requirements and scenarios. This design enables the device to handle a wider flow rate range, enhancing the applicability and flexibility of the measurement.

[0053] Under large flow rate conditions, the second air inlet 6 can be used for preliminary flow rate adjustment and soap film generation; during normal measurement, close the second valve 5 to ensure the stability and accuracy of the measurement process. This mode switching function improves the measurement efficiency and adaptability of the device.

[0054] By reasonably distributing the gas flow rate, soap film instability and measurement errors caused by excessive flow rate are avoided, improving the accuracy and credibility of the measurement results. Under large flow rate conditions, an ideal soap film is quickly generated through the second air inlet 6, reducing the preparation time before measurement and improving the measurement efficiency.

[0055] Connecting tube 4, which is used to connect the film-forming tube 3 and the soap film tube 2 to form a soap film channel, and convey the gas and soap film from the film-forming tube 3 to the soap film tube 2.

[0056] Pipette 7, which is a liquid transfer device that can move the liquid level up and down on the film-forming tube 3 or stop the liquid level at a certain position; it is connected to a soap solution bottle 8 below and is connected to the liquid inlet 305 of the film-forming tube 3 above, and is used to convey the soap solution in the soap solution bottle 8 to the film-forming tube 3; the pipette 7 can precisely control the liquid level in the film-forming tube 3 to quickly rise to the lower end face of the soap film inlet tube 304 or drop away from the soap film inlet tube 304, thereby generating or stopping the generation of the soap film.

[0057] The microcontroller 9 is the control center of the entire device and is communicatively connected to the pipette 7, the liquid level sensing device 303, the first photoelectric sensor 201, and the second photoelectric sensor 202. The microcontroller 9 controls the start (raising or lowering the liquid level) and stop of the pipette 7 according to the signal of the liquid level sensing device 303. The microcontroller 9 receives the signals of the first photoelectric sensor 201 and the second photoelectric sensor 202, calculates the movement time of the soap film in the soap film tube 2, and calculates the instantaneous flow rate of the gas flowing through the soap film flowmeter in combination with the volume of the soap film tube 2. The microcontroller 9 also receives the data of the temperature sensor 14, the pressure sensor 15, and the moisture content sensor 16, performs the conversion of the flow rate in different states, and displays the results on the display screen 12.

[0058] Above the interior of the soap solution tank 1, a temperature sensor 14, a pressure sensor 15, and a moisture content sensor 16 communicatively connected to the microcontroller 9 are installed, which are used to measure environmental parameters and provide a basis for flow rate conversion.

[0059] The display screen 12 and the keyboard 13. The display screen 12 is used to display the measurement results, including the instantaneous flow rate, the measurement time, the temperature, the pressure data, etc.; the keyboard 13 is used to input operation instructions and parameter settings to facilitate the user's operation.

[0060] In an automatic foaming and automatic measuring soap film gas flow standard measuring device, the connection relationships of the various structures are as follows:

[0061] The soap solution tank 1 is located at the bottom of the device and serves as a storage and supply source of the soap solution. Above the soap solution tank 1, the soap film tube 2 is installed and is communicatively connected to the interior of the soap solution tank 1 through the bottom of the soap film tube 2, allowing the soap film to flow back into the soap solution tank 1 after rupture. A liquid discharge port 102 is provided at the bottom of the soap solution tank 1 and is connected to the soap solution bottle 8 for replenishing or replacing the soap solution. The soap film tube 2 is vertically installed above the soap solution tank 1 and is a circular pipe, and its bottom is directly communicatively connected to the soap solution tank 1. Upper and lower scale lines are provided on the soap film tube 2 for measuring the rising height of the soap film.

[0062] On both sides of the upper and lower scale lines, a first photoelectric sensor 201 and a second photoelectric sensor 202 are respectively installed for detecting the moment when the soap film passes through. The film forming tube 3 is located above the soap film tube 2 and is used for generating and transmitting the soap film. Inside the film forming tube 3, a soap film inlet tube 304, a first air inlet 301, a liquid level detection tube 302, and a liquid inlet 305 are provided. The liquid inlet 305 is located at the lower end of the film forming tube 3 and is connected to the pipette 7, and the pipette 7 transports the soap solution from the soap solution bottle 8 into the film forming tube 3. The liquid level detection tube 302 is communicatively connected to the interior of the film forming tube 3, and a liquid level sensing device 303 is installed thereon for monitoring the liquid level position in the film forming tube 3.

[0063] The gas enters the film-forming tube 3 through the first air inlet 301 and pushes the soap film to rise from the soap film inlet tube 304. The connecting tube 4 connects the film-forming tube 3 and the soap film tube 2 to form a soap film channel, allowing the soap film and the gas to smoothly enter the soap film tube 2 from the film-forming tube 3. The pipette 7 is connected to the soap solution bottle 8 at the bottom and the liquid inlet 305 of the film-forming tube 3 at the top. According to the control of the single-chip microcomputer 9, the pipette 7 extracts the soap solution from the soap solution bottle 8 and injects it into the film-forming tube 3 to accurately control the liquid level in the film-forming tube 3.

[0064] The single-chip microcomputer 9 is the control center of the entire device and is communicatively connected to the pipette 7, the liquid level sensing device 303, the first photoelectric sensor 201, the second photoelectric sensor 202, the temperature sensor 14, the pressure sensor 15, the moisture content sensor 16, the display screen 12, and the keyboard 13. The single-chip microcomputer 9 receives the signal from the liquid level sensing device 303, controls the start and stop of the pipette 7, and the injection volume of the soap solution. The single-chip microcomputer 9 receives the signals from the first photoelectric sensor 201 and the second photoelectric sensor 202, calculates the movement time of the soap film, and calculates the instantaneous flow rate in combination with the volume of the soap film tube 2. The single-chip microcomputer 9 also receives the data from the temperature sensor 14, the pressure sensor 15, and the moisture content sensor 16, performs the conversion of the flow rate in different states, and displays the results on the display screen 12.

[0065] The temperature sensor 14, the pressure sensor 15, and the moisture content sensor 16 are installed above the inside of the soap solution tank 1 and are communicatively connected to the single-chip microcomputer 9 to provide environmental parameter data. The display screen 12 is connected to the single-chip microcomputer 9 and is used to display the measurement results. The keyboard 13 is connected to the single-chip microcomputer 9, allowing the user to input operation instructions and parameter settings.

[0066] The single-chip microcomputer 9 is also connected to the ambient temperature sensor 11 and the atmospheric pressure sensor 10. The volume and density of the gas will change with the change of temperature. According to the ideal gas state equation, at the same volume and pressure, an increase in temperature will cause a decrease in gas density, and vice versa. By measuring the ambient temperature, the single-chip microcomputer 9 can perform temperature compensation on the volume flow rate of the gas, so as to more accurately calculate the true flow rate of the gas. At different ambient temperatures, the formation and movement characteristics of the soap film may change. For example, at a higher temperature, the surface tension and viscosity of the soap solution may decrease, affecting the stability and movement speed of the soap film. The data provided by the ambient temperature sensor 11 can help the single-chip microcomputer 9 adjust the measurement parameters to ensure the accuracy of the measurement results.

[0067] The change in atmospheric pressure will affect the volume and density of the gas. At different atmospheric pressures, the volume flow rate of the gas needs to be compensated accordingly. By measuring the atmospheric pressure, the single-chip microcomputer 9 can correct the gas flow rate according to the actual atmospheric pressure conditions, thereby improving the accuracy of the measurement. The data provided by the atmospheric pressure sensor 10 can help the single-chip microcomputer 9 adjust the measurement parameters to ensure the accuracy of the measurement results.

[0068] The data measured by the ambient temperature sensor 11 and the atmospheric pressure sensor 10 are used to compensate for the influence of temperature and pressure changes on the gas flow rate. The single-chip microcomputer 9 can calculate the true gas flow rate more accurately, thereby improving the accuracy and reliability of the entire measuring device.

[0069] All structures are tightly connected and communicate with each other through pipelines, connecting wires, sensors, the single-chip microcomputer 9, etc., and cooperate with each other to complete the automatic foaming and automatic measurement functions of the soap film gas flow measurement. The working process of a standard measuring device for automatic foaming and automatic measurement of soap film gas flow according to the present invention includes the following parts:

[0070] Initial preparation: Check the film-forming tube 3 to ensure that the soap liquid level and the soap film state meet the requirements.

[0071] Automatic wetting: Through the cooperation of the pipette 7 and the gas, a soap film is generated and the inner wall of the soap film tube 2 is wetted.

[0072] Soap film generation: Precisely control the liquid level to generate a complete soap film that meets the measurement requirements.

[0073] Soap film movement: The gas pushes the soap film to move stably in the soap film tube 2.

[0074] Photoelectric detection: The photoelectric sensor precisely detects the moment when the soap film passes, and the single-chip microcomputer 9 times.

[0075] Flow rate calculation: The single-chip microcomputer 9 calculates the instantaneous flow rate according to the time and volume data.

[0076] Data conversion: Combine the data of sensors such as temperature and pressure to perform flow rate conversion.

[0077] Result display: The measurement results, including data such as instantaneous flow rate, temperature, and pressure, are displayed through the display screen 12.

[0078] Continuous measurement: Repeat the above steps to achieve long-term continuous measurement.

[0079] Through the above series of automated steps, the generation, movement, and rupture of the soap film are realized, and the gas flow rate is accurately measured in combination with multi-sensor data. The following is the detailed and specific working process of the present invention:

[0080] S1. Initial preparation stage; Check the film-forming tube 3 to ensure that the soap liquid level in the film-forming tube 3 is kept below the soap film inlet tube 304 and no soap film is formed. This is to ensure the accuracy of the measurement and avoid initial errors.

[0081] S2, the stage of automatically wetting the wall of the soap film tube 2; Step S21: The pipette 7 extracts soap solution from the soap solution bottle 8, and controls the liquid level in the film forming tube 3 to rapidly rise to the lower end face of the soap film inlet tube 304. This step is to ensure that there is enough soap solution in the film forming tube 3 to generate a soap film.

[0082] Step S22: Gas enters the film forming tube 3 through the first air inlet 301. Under the push of the gas, soap film is generated at the soap film inlet tube 304 of the film forming tube 3 and moves along the film forming tube 3. At this time, the soap film begins to form and move upward.

[0083] Step S23: The stage of wetting the tube wall. When the soap film moves in the soap film tube 2, it may initially break, but with the continuous supply of soap solution, the entire inner wall of the soap film tube 2 will gradually be wetted by the soap solution. Until the complete soap film runs to the lower end of the soap film tube 2 and breaks in the soap solution pool 1, and the foam remains in the soap solution pool 1. Thus, the entire inner wall of the soap film tube 2 is wetted, preparing for the subsequent flow measurement.

[0084] S3, the automatic measurement stage; Step S31: Gas enters the film forming tube 3 through the first air inlet 301 again. The pipette 7 extracts soap solution from the soap solution bottle 8 and controls the liquid level in the film forming tube 3 to rapidly rise to the lower end face of the soap film inlet tube 304. After the liquid level sensing device 303 detects the liquid level signal, the single-chip microcomputer 9 controls the pipette 7 to quickly lower the liquid level away from the lower end face of the soap film inlet tube 304, thereby forming a single complete soap film. This step ensures that only one soap film is generated each time, avoiding measurement errors caused by the simultaneous presence of multiple soap films.

[0085] Step S32: The gas pushes the complete soap film to move along the film forming tube 3, passes through the connecting tube 4 and enters the soap film tube 2. The soap film moves from top to bottom in the soap film tube 2 until it moves to the lower end of the soap film tube 2 and enters the soap solution pool 1, and the foam remains in the soap solution pool 1.

[0086] Step S33: When the soap film passes through the first photoelectric sensor 201, the sensor transmits the detected signal to the single-chip microcomputer 9, and the timer of the single-chip microcomputer 9 starts timing. When the soap film continues to move to the second photoelectric sensor 202, the sensor transmits the signal to the single-chip microcomputer 9, and the timing stops. This step accurately measures the time for the soap film to pass through the soap film tube 2 through the photoelectric sensor.

[0087] Step S34: The single-chip microcomputer 9 calculates the instantaneous flow rate of the gas flowing through the soap film flowmeter according to the movement time of the soap film between the first photoelectric sensor 201 and the second photoelectric sensor 202 and the volume between the two scale lines of the soap film tube 2. This step calculates the instantaneous flow rate by using the moving speed of the soap film in the soap film tube 2 and the volume of the soap film tube 2.

[0088] Step S35: The single-chip microcomputer 9 performs conversion of flow rates in different states in combination with the data measured by the temperature sensor 14, the pressure sensor 15, and the moisture content sensor 16. Since the volume and density of the gas change with temperature, pressure, and moisture content, corresponding conversions are required to obtain accurate flow rate values. The calculated instantaneous flow rate, temperature, and pressure data are displayed on the display screen 12 for the user to view.

[0089] S4. Continuous measurement stage; Steps S31 to S35 are repeated to perform continuous flow rate measurement. This step allows the user to continuously measure the gas flow rate for a long time and is applicable to scenarios where continuous monitoring of the gas flow rate is required.

[0090] The single-chip microcomputer 9 is also connected to an ambient temperature sensor 11 and an atmospheric pressure sensor 10. By measuring the ambient temperature and atmospheric pressure, the single-chip microcomputer 9 can perform temperature and pressure compensation on the gas flow rate, further improving the measurement accuracy. The single-chip microcomputer 9 is communicatively connected to a display screen 12 and a keyboard 13. The user can input operation instructions and set parameters through the keyboard 13, and the measurement results are displayed on the display screen 12 for the user to view and record conveniently.

[0091] An automatic foaming and automatic measuring soap film gas flow rate standard measuring device of the present invention accurately measures the gas flow rate by automatically controlling the generation, movement, and rupture of the soap film and combining multi-sensor data, avoiding errors caused by manual operation and foam residue in traditional soap film flow meters.

[0092] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A standard measuring device for soap film gas flow with automatic foaming and automatic measurement, characterized in that: It includes the following structure: A soap liquid pool (1) is provided with a soap film tube (2) and an air outlet (101); A soap film tube (2) is installed above the soap liquid pool (1), the soap film tube (2) being a vertical circular pipe, the bottom of which is connected to the soap liquid pool (1); an upper scale line and a lower scale line are provided on the soap film tube (2), and a first photoelectric sensor (201) and a second photoelectric sensor (202) are respectively installed on both sides of the upper scale line and the lower scale line to detect the moment when the soap film passes through and transmit the signal to the single chip computer (9); A film-forming tube (3) is used for generating and transmitting a soap film. A soap film inlet tube (304), a first air inlet (301), a liquid level detection tube (302) and a liquid inlet (305) are provided in the internal cavity of the film-forming tube (3) and are in communication with the film-forming tube (3); the liquid inlet (305) is provided at the lower end of the film-forming tube (3); the liquid level detection tube (302) is in communication with the inside of the film-forming tube (3) and is used for monitoring the position of the liquid level; a liquid level sensing device (303) is installed on the liquid level detection tube (302) at the same horizontal position as the soap film inlet to monitor the position of the liquid level in the film-forming tube (3); after the gas enters the film-forming tube (3) through the first air inlet (301), the soap film is pushed up from the soap film inlet tube (304); A connecting tube (4) connects the soap film passage of the film forming tube (3) and the soap film tube (2) to transport the gas and the soap film from the film forming tube (3) to the soap film tube (2); The pipette (7) is a pipetting device that can move the liquid level up or down the film forming tube (3) or stop the liquid level at a certain position. A soap liquid bottle (8) is connected below the pipette, and the pipette (7) is connected to the liquid inlet (305) of the film forming tube (3). The pipette (7) transfers the soap liquid from the soap liquid bottle (8) to the film forming tube (3), and enables the liquid level in the film forming tube (3) to quickly rise to the lower end surface of the soap film inlet tube (304) or to drop away from the soap film inlet tube (304), so that a soap film that meets the measurement requirements can be generated in the soap film inlet tube (304). A single chip microcomputer (9) is connected in communication with a pipette (7), a liquid level sensing device (303), a first photoelectric sensor (201) and a second photoelectric sensor (202), controls the pipette (7) to move up, move down and stop the liquid level according to a signal from the liquid level sensing device (303), and receives signals from the first photoelectric sensor (201) and the second photoelectric sensor (202) to calculate an instantaneous flow rate; The single chip microcomputer (9), the pipette (7), the film forming tube (3) and the liquid level sensing device (303) are combined to complete the automatic film forming process.

2. The automatic foaming and automatic measuring soap film gas flow standard measuring device according to claim 1, characterized in that: The bottom of the soap liquid pool (1) is provided with a liquid discharge port (102), which is connected to a soap liquid bottle (8), and a first valve (103) is provided on the connecting pipe (4); a temperature sensor (14), a pressure sensor (15) and a moisture content sensor (16) which are communicatively connected to a single-chip computer (9) are installed above the inside of the soap liquid pool (1); the single-chip computer (9) receives data from the temperature sensor (14), the pressure sensor (15) and the moisture content sensor (16) to convert flow values ​​in different states.

3. The automatic foaming and automatic measuring soap film gas flow standard measuring device according to claim 1, characterized in that: The upper end of the soap film tube (3) is made into a "T" shape, and a second air inlet (6) is provided, and a second valve (5) is provided at the second air inlet (6); when the gas flow is large, the second valve (5) is placed in a venting state, so that a portion of the gas enters the soap film tube (2) from the second air inlet (6), thereby reducing the gas flow through the first air inlet (301), making it easier to generate an ideal soap film; when measuring the flow, the second valve (5) is placed in a closed state.

4. The automatic foaming and automatic measuring soap film gas flow standard measuring device according to claim 1, characterized in that: The single chip computer (9) is communicatively connected to a display screen (12) and a keyboard (13); the display screen (12) displays measurement results, including instantaneous flow, measurement time, temperature, and pressure data; and operation instructions and parameter settings are input through the keyboard (13).

5. A method for measuring flow rate using an automatic foaming and automatic measuring soap film gas flow standard measuring device as described in any one of claims 1 to 4, characterized in that: It includes the following steps: S1, initial preparation stage, check the film forming tube (3), ensure that the soap liquid level in the film forming tube (3) is kept below the soap film inlet tube (304) and no soap film is formed; S2, the automatic wetting of the soap film tube (2) wall stage, including: S21, the pipette (7) extracts soap liquid from the soap liquid bottle (8) and controls the liquid level in the film tube (3) to rise rapidly to the lower end surface of the soap film inlet tube (304); S22, gas enters the film-forming tube (3) through the first gas inlet (301), and under the impetus of the gas, the soap liquid generates a soap film at the soap film inlet tube (304) of the film-forming tube (3), and moves along the film-forming tube (3); S23, in the tube wall wetting stage, the soap film moves in the soap film tube (2) and initially breaks one after another. However, as the soap liquid is continuously supplied, the entire inner wall of the soap film tube (2) is gradually wetted by the soap film (soap liquid); until the complete soap film runs to the lower end of the soap film tube (2) and breaks in the soap liquid pool (1), and the foam remains in the soap liquid pool (1); at this point, the inner wall of the soap film tube (2) is completely wetted, and the normal flow measurement stage is entered; S3, automatic measurement stage, including: S31, gas enters the film-forming tube (3) through the first air inlet (301), the pipette (7) extracts soap liquid from the soap liquid bottle (8), and controls the liquid level in the film-forming tube (3) so that it rises rapidly to the lower end surface of the soap film inlet tube (304), and after the liquid level sensing device (303) installed on the liquid level detection tube (302) detects the liquid level signal, the pipette (7) is controlled through the single-chip microcomputer (9) so that the liquid level drops rapidly and leaves the lower end surface of the soap film inlet tube (304), thereby forming a single complete soap film; S32, the gas pushes the complete soap film to move along the film-forming tube (3), passes through the connecting tube (4) and enters the soap film tube (2), and the soap film moves from top to bottom in the soap film tube (2) until it moves to the lower end of the soap film tube (2) and enters the soap liquid pool (1), and the foam remains in the soap liquid pool (1); S33, when the soap film passes through the first photoelectric sensor (201), the sensor transmits the detected signal to the single-chip computer (9), and the timer of the single-chip computer (9) starts timing; when the soap film continues to move to the second photoelectric sensor (202), the sensor transmits the signal to the single-chip computer (9), and the timing stops; S34, the single chip computer (9) calculates the instantaneous flow rate of the gas flowing through the soap film flowmeter according to the movement time of the soap film between the first photoelectric sensor (201) and the second photoelectric sensor (202) and the volume between the two scale lines of the soap film tube (2); S35, the single chip computer (9) combines the data measured by the temperature sensor (14), the pressure sensor (15) and the moisture content sensor (16) to convert the flow rates in different states; the calculated instantaneous flow rate, temperature and pressure data are displayed on the display screen (12); S4. Continuous measurement, including: Repeat steps S31-S35 to perform continuous flow measurement.

6. The method according to claim 5, characterized in that The specific process of step S31 is as follows: The liquid level sensing device (303) transmits the liquid level information to the single chip microcomputer (9), and the single chip microcomputer (9) controls the pipette (7) to extract soap liquid from the soap liquid bottle (8) according to the liquid level information, and injects the soap liquid into the film forming tube (3); the pipette (7) precisely controls the injection amount of the soap liquid, so that the liquid level in the film forming tube (3) rises to the soap film inlet tube (304), and the liquid level sensing device (303) detects the liquid level change and transmits a signal to the single chip microcomputer (9), and the single chip microcomputer (9) immediately stops the soap liquid injection operation of the input device, and reversely controls the pipette (7) to make the liquid level in the film forming tube (3) drop rapidly and leave the soap film inlet tube (304), so that the gas pushes the soap liquid to form a complete soap film in the film forming tube (3), and multiple soap films will not be generated continuously.

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