CN111289042A - A soap film flowmeter for measuring large flow - Google Patents

Abstract

The invention belongs to the technical field of measuring fluid flow continuously passing through an instrument, and discloses a soap film flowmeter for measuring large flow, comprising an upper cavity, a soap film tube, a soap pool, a film lifting ring and a lifting device for the film lifting ring. The cavity is sealedly connected to the upper part of the outer wall of the soap film tube, and the film lifting ring is connected to the lifting device of the film lifting ring. In this technical scheme, by setting up multiple soap film tubes, the capacity of large flow for each soap film tube is dispersed, so that the measurement accuracy of large flow is the same as that of each soap film tube; Under the action of the membrane column, the soap membrane formed by the outer wall of the soap membrane tube and the inner wall of the membrane ring is torn or vibrated, thereby successfully breaking the membrane, avoiding the generation of double membranes, and solving the precise measurement of large flow and the avoidance of double membranes. problem, idealize the measurement situation, and make the inspection data precise.

Description

A soap film flowmeter for measuring large flow

technical field

The invention belongs to the technical field of measuring fluid flow continuously passing through an instrument, in particular to a soap film flowmeter for measuring large flow.

Background technique

The People's Republic of China Metrology and Verification Regulations JJG586-2006 "Soap Film Flowmeter" has a detailed description of the working principle and structure of the soap film flowmeter. In the prior art, the structure of the soap film flowmeter is a soap film tube with a scale. The upper part of the outer wall of the soap film tube is provided with an upper infrared pair tube, and the lower part of the outer wall of the soap film tube is provided with a lower infrared pair tube. The lower opening is the air inlet. The lower part of the soap film tube is provided with a film lifting ring, and the soap film liquid is arranged under the film lifting ring. The working principle is: the gas to be measured enters the soap film through the lower opening of the soap film tube, that is, the air inlet. Tube, the film-forming ring generates soap film from the soap film liquid, and then moves upward, and the soap film rises along the soap film tube. When the soap film rises to the lower infrared opposite tube on the outer wall of the soap film tube, the timer starts to count, and when the soap film rises to the upper infrared opposite tube of the outer wall of the soap film tube, the timer stops timing. The volume between the upper infrared pair tube and the lower infrared pair tube can calculate the instantaneous flow through the soap film flowmeter. The electronic soap film flowmeter is in the process of soap film rising, when it passes the lower limit and upper limit of a pair of sensors installed on the outer wall, the display instrument directly displays the instantaneous flow, which makes the measurement data more accurate.

However, in practical work, there are often problems that the theory is not suitable to solve. According to the above theory, if a large flow rate needs to be measured, the larger the flow rate needs to pass through the larger volume of the soap film tube, which can keep the diameter of the soap film tube within the same range. Change, increase the height of the soap film tube, but the large flow rate is very fast, and the soap film is easy to break. To take a step back, even if it does not break, the time for the soap film to go from the lower photoelectric pair to the upper photoelectric pair is very short. The soap film goes from the bottom photoelectric tube to the top photoelectric tube in an instant. The smaller the time difference, the greater the timing error, and the final measured flow error will be very large; another method is to thicken the soap film tube. , so that the diameter of the soap film tube becomes larger, the diameter of the soap film required for the large diameter soap film tube becomes larger, and the greater the influence of the airflow pressure and gravity, the soap film will present a concave surface toward the airflow direction, and the concave surface is in the airflow direction. It will bulge to a certain height, so the appearance of the concave surface will affect the measurement of the photoelectric tube, and at the same time cause the soap film to be unstable and easy to break. It brings errors to the flow measurement and cannot be measured accurately. People realize that the measurement of large flow, the soap film flowmeter cannot be achieved, so they have to give up the soap film flowmeter, the most accurate measurement method, and use other indirect methods to measure the flow. Therefore, in the prior art, the field of soap film flowmeter for large flow measurement is blank.

In addition, assuming the above problem is solved, during the measurement process, after the film release button is pressed for the first time, an annular soap film will be formed on the outer wall of the soap film tube and the inner wall of the film release ring. When the film lifting button is pressed for the second time, when the film lifting ring falls to the lower mouth of the soap film tube, a new film will form and cover the soap film tube. The membrane ring moves upward under the elastic force of the spring. When the membrane ring is released from the liquid surface of the soap film, a membrane will be formed again. In this way, two membranes will be formed in the process of pressing the membrane button once, so it is necessary to record the two membranes respectively. The time point when passing through the two sets of sensors, and calculate the time difference of each membrane passing through the two sets of sensors, and calculate the average value, that is, the time difference × the volume of the soap film tube between the known sensor cross-section = unit time The flow rate through the soap film tube (unit L/min). Such a solution is not only computationally cumbersome and interferes with calculating the flow rate, but also causes measurement failures if either membrane ruptures during motion, resulting in data loss.

Therefore, it is necessary to provide a soap-film flowmeter that can measure large flow rates, ensure accuracy, and avoid double-film formation.

SUMMARY OF THE INVENTION

The soap film tube has an upper scale line and a lower scale line. The upper scale line on the outer wall of the soap film tube is provided with an upper infrared pair tube, and the lower scale line on the outer wall of the soap film tube is provided with a lower infrared pair tube.

There is no soap film flowmeter for large flow measurement in the prior art, it is unavoidable that the soap film flowmeter has a double film, and other methods cannot ensure the measurement accuracy. In view of the above defects of the prior art, this scheme is proposed, and the purpose is to provide a large amount of The soap film flowmeter of the whole process can avoid the large-flow soap film flowmeter with double membranes, which is realized by the following scheme.

A soap film flowmeter for measuring large flow, comprising an upper cavity, a soap film tube, a soap liquid pool, a film lifting ring and a lifting device for the film lifting ring. The lifting device of the film lifting ring is connected, there are at least two soap film tubes, and the upper part and the lower part of the outer wall of each soap film tube are respectively provided with infrared pair tubes.

Further, the soap film tubes share a film-lifting ring. It is easy to operate by sharing a film lifting ring, which is convenient to check whether the film is lifted without checking them one by one.

Further, the film-lifting ring is not a perfect circle. If multiple soap film tubes are lined up, a very large soap film will be formed by using a perfectly circular film-forming ring. From the aforementioned knowledge, the large soap film is unstable and is also greatly affected by gravity, which may also lead to The uneven surface of the soap film makes the time when the lower nozzle of the soap film tube receives the soap film not synchronized, and the volume of the gas flowing through the soap film tube will change, which will cause errors in the measurement results. The soap film tubes lined up in a row can be used for long oval soap film tubes. The short axis of the ellipse is slightly larger than the outer wall of the soap film tube, and the long axis of the ellipse is slightly larger than all the soap film tubes lined up in a row. total length. In this way, due to the short short axis of the ellipse, it is difficult to form a concave and convex surface due to the influence of gravity, so that the measurement accuracy is higher.

Further, the soap film tubes are evenly distributed. Even distribution can also stabilize the soap film at the bottom of each soap film tube, making each soap film more stable, which is conducive to accurate measurement of large flow.

Further, the lifting ring is connected with two lifting devices of the lifting ring. The film lifting rod passes through the film lifting spring, one end is connected with the film lifting button, and the other end is connected with the film lifting ring. The film lifting ring is connected with a lifting device of the lifting ring. If there are too many soap film tubes, the lifting ring will be very large, and the side connected to the lifting device of the film lifting ring may be higher than the other side, causing the soap film of each soap film tube. The membrane is not synchronized, which affects the measurement accuracy.

Further, the film lifting ring is provided with a slit. In order to prevent double film, the soap film between the outer wall of the soap film tube and the film ring is torn by the crack of the film ring.

Further, a membrane breaking column is arranged in the movement direction of the membrane lifting ring. Pressure is applied to the vicinity of the crack on the pull-up ring with the film-breaking column, causing the crack to become larger, and finally tearing the soap film between the outer wall of the soap film tube and the pull-up ring.

Further, the outer wall of the soap film tube is provided with a soap film tube support, and the soap film tube support is provided with a membrane breaking column. The outer wall of the soap film tube and the soap film tube bracket are sealed and connected.

Further, the film-lifting ring is broken along the crack by the force of the film-breaking column in the moving direction of the film-lifting ring.

Further, the film-lifting ring is subjected to the force of the film-breaking column in the direction perpendicular to the film-lifting ring and the movement direction, so that the film-lifting ring is broken along the crack.

In this technical scheme, by setting up multiple soap film tubes, the capacity of large flow for each soap film tube is dispersed, so that the measurement accuracy of large flow is the same as that of each soap film tube; Under the action of the membrane column, the soap membrane formed by the outer wall of the soap membrane tube and the inner wall of the membrane ring is torn or vibrated, thereby successfully breaking the membrane, avoiding the generation of double membranes, and solving the precise measurement of large flow and the avoidance of double membranes. problem, idealize the measurement situation, and make the inspection data precise.

Description of drawings:

Figure 1: Structure diagram of a prior art soap film flowmeter.

Figure 2: The structure diagram of Example 1 of the soap film flowmeter for measuring large flow of the present invention.

Figure 3: The structure diagram of Example 2 of the soap film flowmeter for measuring large flow of the present invention.

Figure 4: The structure diagram of Example 3 of the soap film flowmeter for measuring large flow of the present invention.

Figure 5: A schematic diagram of the positional relationship between the soap film tube and the film-lifting ring in Example 3 of the present invention.

Fig. 6: The structure diagram of Embodiment 4 of the soap film flowmeter for measuring large flow of the present invention.

Fig. 7: Schematic diagram of the positional relationship between the soap film tube and the film lifting ring in Example 4 of the present invention.

Figure 8: The structure diagram of Embodiment 5 of the soap film flowmeter for measuring large flow of the present invention.

Fig. 9 is a structural diagram of Example 6 of the soap film flowmeter for measuring large flow of the present invention.

Figure 10: The structure diagram of Example 7 of the soap film flowmeter for measuring large flow of the present invention.

FIG. 11 is a structural diagram of Embodiment 8 of the soap film flowmeter for measuring large flow of the present invention.

Among them: 1. Upper cavity; 2. The first upper sealing ring; 3. The first upper infrared tube; 4. The first soap film tube; 5. The first lower infrared tube; 6. The film button; 7. 8. Film ring and film ring pull rod; 9. Soap pool; 10. The second soap film tube; 11. The second upper infrared pair tube; 12. The third soap film tube; 13. The third Upper infrared pairing tube; 14. The second lower infrared pairing tube; 15. The third lower infrared pairing tube; 16. The third lower sealing ring; 17. The film ring; 18. The soap film liquid; 21. The second lower sealing ring; 22. The first lower sealing ring; 23. The second upper sealing ring; 24. The third upper sealing ring; 25. The crack; 26. The membrane breaking column.

Detailed ways

The technical solution is described in detail according to the accompanying drawings.

Figure 1 shows the principle of the soap film flowmeter in the prior art. The soap film tube is connected to the upper cavity 1. The upper cavity 1 is provided with an air suction port 19, and a seal is provided between the upper cavity 1 and the soap film tube. Circle, the upper part of the soap film tube is provided with an upper infrared transmitting tube and an upper infrared receiving tube, the lower part of the soap film tube is provided with a lower infrared transmitting tube and a lower infrared receiving tube, and a soap liquid pool 9 is arranged under the soap film tube, and the soap liquid pool 9 contains soap film liquid 18, the soap film liquid 18 is immersed with a film lifting ring 17, the film lifting ring 17 pulls up the soap film to cover the lower mouth of the soap film tube, the air suction port 19 starts to pump air, and the soap film is in the soap film tube. After rising through the lower infrared emitting tube and the lower infrared receiving tube of scale B, it continues to rise. After a period of time, the soap film passes through the upper infrared generating tube and the upper infrared receiving tube of scale A, and records the time and gas of the soap film from scale B to scale A. volume, the flow rate of the gas can be known. The existing soap film flowmeter can only measure the flow below 10L, the diameter of the soap film tube is 30mm, and the accuracy of each soap film flowmeter is 0.5, that is, the error is 0.5%. If you need to measure a large flow, then you need to change to a large diameter soap film tube. However, the larger the flow rate, the larger the volume of the soap film pipe needs to be, the diameter of the soap film pipe can be kept unchanged, and the height of the soap film pipe can be increased, but the large flow rate is very fast, and the soap film is easy to break. , even if it is not broken, the time of the soap film from the lower photoelectric pair to the upper photoelectric pair is very short. It may be that the soap film goes from the bottom photoelectric pair to the top photoelectric pair in an instant. The smaller the time difference, the greater the timing error. , the final measured flow error will also be very large; another method, it is necessary to make the soap film tube thicker, so that the diameter of the soap film tube becomes larger, and the diameter of the soap film required for the large diameter soap film tube becomes larger. The greater the influence of airflow pressure and gravity, the soap film will present a concave surface facing the airflow direction, and the concave surface will bulge to a certain height in the airflow direction, so the appearance of the concave surface will affect the measurement of the photoelectric tube, and the diameter of the soap film will change. If the soap film is too large, the soap film will be unstable, and the soap film will be easily broken and the page will be dented. These all bring errors to the flow measurement and cannot be measured accurately. For example, measuring 30L and using a 60mm soap film tube, the error will reach 1%. If the flow rate is measured again, the above-mentioned various problems will occur. Taking a step back, even if the above-mentioned problems do not occur, the measured error will be very large, and the meaning of the measurement will be lost.

The large-flow soap film flowmeter of the present invention includes a soap film tube 10, a soap liquid pool 9, a film lifting ring 17 and a lifting device for the film lifting ring 17. The film lifting ring 17 is connected with the lifting device of the film lifting ring 17, and is provided with at least one soap In the membrane tube 10, the upper part and the lower part of each soap membrane tube 10 are respectively provided with infrared pair tubes. By using at least two small soap film flow tubes, this technical solution solves the technical problem that the soap film flowmeter cannot be used to measure large flow in the prior art, and avoids various problems caused by the measurement of large diameter soap films. The error of a single soap film flowmeter is 0.5%, and the error of a soap film tube measuring 10L flow is 0.05. To measure the flow of 100L, use 10 soap film tubes to measure 10L, the total error is 10*0.05=0.5, and the total flow is 100L, then the total error measured is 0.5 divided by 100, which is still 0.5%. It can be seen that no matter how much flow is measured, the error is unchanged, and the error of each soap film tube is still 0.5%.

Example 1

As shown in Figure 2, the soap film flowmeter for measuring large flow of this embodiment is provided with an upper cavity 1, three soap film tubes, a soap liquid pool 9, a film lifting ring 17 and a lifting device for the film lifting ring 17, three The soap film tubes are respectively the first soap film tube 4, the second soap film tube 10 and the third soap film tube 12. They are placed according to the positions of the three vertices of an equilateral triangle. Each soap film tube has a diameter of 30mm and an upper cavity. 1 is sealed with the outer walls of the three soap film tubes, the upper cavity 1 is sealed with the outer walls of the three soap film tubes, the upper mouths of the three soap film tubes are in the upper cavity 1, and the upper cavity 1 is connected with the first soap film tube. 4. The first upper sealing ring 2 is used to seal, the upper chamber 1 and the second soap film tube 10 are sealed with the second upper sealing ring 23, and the upper chamber 1 and the third soap film tube 12 are sealed with the third upper sealing ring 24. The upper cavity 1 is provided with an air suction port 19, the upper part of the outer wall of the first soap film tube 4 is provided with a first upper infrared pair tube 3, the lower part of the outer wall of the first soap film tube 4 is provided with a first lower infrared pair tube 5, and the second soap film tube 4 is provided with a first lower infrared pair tube 5. The upper part of the outer wall of the membrane tube 10 is provided with a second upper infrared pair tube 11, the outer lower part of the second soap film tube 10 is provided with a second lower infrared pair tube 14, and the upper part of the outer wall of the third soap film tube 12 is provided with a third upper infrared pair tube 13 , the lower part of the outer wall of the third soap film tube 12 is provided with a third lower infrared pair tube 15 . A soap film tube bracket 20 is provided to fix the lower ends of the three soap film tubes. A first lower sealing ring 22 is arranged between the soap film tube bracket 20 and the first soap film tube 4. The soap film tube bracket 20 and the second soap film tube are provided with a first lower sealing ring 22. A second lower sealing ring 21 is provided between 10 , and a third lower sealing ring 16 is provided between the soap film tube and the third soap film tube 12 . The lifting device of the film lifting ring 17 is arranged on the soap film tube holder 20 . The lifting device of the film lifting ring 17 includes the film lifting ring 7, the film lifting ring pulling rod 8 and the film lifting button 6, the film lifting ring pulling rod 8 passes through the film lifting yellow 7, and one end is connected with the film lifting button 6 , and the other end is connected with the film ring 17 . The film lifting ring 17 is a separate area for each soap film tube, and the plane where the film lifting ring 17 is located is parallel to the plane where the lower nozzle of the soap film pipe is located. The film-lifting ring is connected to the film-lifting ring pull rod 8 perpendicular to the plane where the film-lifting ring 17 is located.

During the measurement, press the button of the film release ring 17 and release it. The film release ring 17 is individually stained with soap film liquid 18 for the area set for each soap film tube to form a soap film. The film release ring 17 acts as a film elastic yellow 7 When it goes up, when it reaches the lower nozzles of the three soap film pipes, the soap film is covered under the nozzles. Under the action of the air suction port 19 of the upper chamber 1, the gas flows, so that the soap film in the soap film pipe moves upwards. When the soap film in the soap film tube reaches the infrared pairing tube at the lower part of the soap film tube, the infrared pairing tube records the moment. time. The difference between the above two moments is the time for the fluid to pass through the soap film tube, and the large flow to be measured can be obtained by matching the volume of the soap film tube between the upper and lower infrared pairs of tubes.

Example 2

As shown in FIG. 3 , on the basis of Embodiment 1, the film lifting ring 17 is adjusted in this embodiment, instead of setting a separate soap film area for each soap film tube, the same soap film is used as a whole. Other structures are the same as those in Embodiment 1, and are not repeated here. Sharing a film lifting ring 17 is convenient to operate, and it is convenient to check whether the film is lifted without checking them one by one. Avoid accidental rupture of the soap film in individual areas causing measurement failures.

When measuring, press the button of the film lifting ring 17 and release it, and the film lifting ring 17, which is stained with the soap film liquid 18 to form the soap film, rises under the action of the film elastic yellow 7, and when it reaches the lower nozzle of the soap film tube, the The soap film is covered under the mouth of the pipe, and under the action of the air suction port 19 of the upper chamber 1, the gas flows, so that the soap film in the soap film pipe moves upward. When the tube is on, the infrared pair tube records the moment, and when the soap film in the soap film tube continues to rise to the infrared pair tube on the upper part of the soap film tube, the moment is recorded. The difference between the above two moments is the time for the fluid to pass through the soap film tube, and with the volume of the soap film tube between the upper and lower infrared pairs of tubes, the large flow rate to be measured can be obtained.

Example 3

As shown in FIGS. 4 and 5 , the difference between this embodiment and Embodiment 2 is that the three soap film tubes are arranged in a straight line, and the soap film tubes are long and oval. Other structures are the same as those in Embodiment 2, and are not repeated here. The soap film tubes are lined up in a row, and a large soap film will be formed with a perfectly circular film-forming ring 17. From the aforementioned knowledge, the large soap film is unstable, and is also greatly affected by gravity, which may also bring about a soap film. The uneven surface makes the time when the lower nozzle of the soap film tube receives the soap film not synchronized, and the volume of gas flowing through the soap film tube will change, which will cause errors in the measurement results. The soap film tubes lined up in a row can be used for long oval soap film tubes. The short axis of the ellipse is slightly larger than the outer wall of the soap film tube, and the long axis of the ellipse is slightly larger than all the soap film tubes lined up in a row. total length. In this way, due to the short short axis of the ellipse, it is difficult to form a concave and convex surface due to the influence of gravity, so that the measurement accuracy is higher.

During measurement, press the button 17 and release it, and the ellipse-shaped film ring 17 is stained with the soap film liquid 18 to form a soap film. When the soap film is placed under the nozzle, under the action of the suction port 19 of the upper chamber 1, the gas flows, so that the soap film in the soap film tube moves upward. When the soap film in the soap film tube reaches the lower part of the soap film tube When the infrared pairing tube is in 100°C, the infrared pairing tube records the time, and when the soap film in the soap film tube continues to rise to the infrared pairing tube on the upper part of the soap film tube, the time is recorded. The difference between the above two moments is the time for the fluid to pass through the soap film tube, and with the volume of the soap film tube between the upper and lower infrared pairs of tubes, the large flow rate to be measured can be obtained.

Example 4

As shown in FIG. 6 and FIG. 7 , compared with Example 2, this embodiment adds two soap film tubes, totaling five soap film tubes, which are placed according to the positions of the five vertices of a regular pentagon. Other structures are the same as those in Embodiment 2, and are not repeated here. The uniform distribution can stabilize the soap film at the lower part of the five soap film tubes, making each soap film more stable, which is conducive to the accurate measurement of large flow.

During measurement, press the button of the film lifting ring 17 and release it, and the soap film ring that is stained with the soap film liquid 18 to form a soap film rises under the action of the film elastic yellow 7, and when it reaches the lower nozzle of the five soap film tubes, The soap film is covered under the nozzle, and under the action of the suction port 19 of the upper chamber 1, the gas flows, so that the soap film in the five soap film pipes moves upward. When the soap film in the five soap film pipes reaches the soap film When the infrared tube at the bottom of the tube is aligned with the tube, the time is recorded by the infrared tube, and when the soap film in the five soap film tubes continues to rise to the infrared paired tube at the upper part of the soap film tube, the moment is recorded. The difference between the above two moments is the time for the fluid to pass through the soap film tube, and with the volume of the soap film tube between the upper and lower infrared pairs of tubes, the large flow rate to be measured can be obtained.

Example 5

As shown in FIG. 8 , the difference between this embodiment and Embodiment 4 is that a set of lifting devices for the lifting ring 17 is added on the opposite side of the lifting device for the original lifting ring 17 . Ensure that the heights on both sides of the film lifting ring 17 are the same, and ensure that the film lifting ring 17 moves smoothly. Other structures are the same as those in Embodiment 4, and are not repeated here.

Example 6

As shown in FIG. 9 , the difference between this embodiment and the second embodiment is that the film-lifting ring 17 has a slit 25 penetrating the film-raising ring 17 diagonally downward, so that the two sides of the film-raising ring 17 at the slit 25 overlap each other. , can also be separated from each other. Other structures are the same as those in Embodiment 2, and are not repeated here.

During measurement, press the lifting device of the membrane lifting ring 17 once, the membrane lifting ring 17 is immersed in the soap bath 9, remove the force exerted on the lifting device of the membrane lifting ring 17, and the membrane lifting ring 17 is lifted by the membrane lifting rod 8 Connected and bounced up under the action of the film spring 7, the soap film contacts the lower surface of the soap film tube, the lower surface of the soap film tube is covered with a soap film, and the annular inner wall between the outer wall of the soap film tube and the film ring 17 There are also circular soap films. Before the second measurement, press down the pull rod quickly and forcefully, and the end of the film ring pull rod 8 near the edge of the crack 25 drops rapidly under the action of force, while the other end of the crack 25 is under the action of inertia , but also maintain the original position, so that the film ring 17 has a relative motion at both ends of the crack 25, relying on the relative motion brought by this inertia, tearing the outer wall of the soap film tube and the ring between the film ring 17. soap film.

When the film ring 17 is immersed in the soap bath 9 for the second time, the force on the pull rod 8 of the film ring is removed, and the film ring 17 is connected to the pull rod 7 by the pull rod 8 of the film ring Bounce up under the action of the film ring 17, because the film ring 17 is provided with a crack 25 at the connection between the film ring pull rod 8 and the film ring 17 and the crack 25 is in the direction of the slash "/", so near the edge of the crack 25 The end connected to the film ring pull rod 8 is at the right end of the slash "/", and the other end of the crack 25 is at the left end of the slash "/". When moving upward under the action of the slash, the part of the film lifting ring 17 at the right end of the slash "/" will move up together with the part of the film lifting ring 17 at the left end of the slash "/", so there is no relative movement problem caused by inertia, and the The membrane ring 17 is integrally connected by the membrane ring pull rod 8 and bounces up under the action of the membrane spring 7, the soap film contacts the lower surface of the soap film tube, and the lower surface of the soap film tube is covered with a soap film to complete the first step. secondary measurement.

Each time the measurement is completed, the time for the soap film to pass through the upper and lower pairs of infrared tubes is recorded respectively, and the time difference is obtained. The unit is L/min), if it is not in the standard environment, use the known compensation formula for conversion.

Example 7

As shown in FIG. 10 , the difference between this embodiment and Embodiment 6 is that a membrane breaking column 26 is provided on the movement track of the membrane lifting ring 17 and the soap membrane tube support 20 . Other structures are the same as those in Embodiment 6, and are not repeated here.

The film lifting ring 17 has a crack 25, the direction of the crack 25 is inclined downward, the crack 25 cuts off the film lifting ring 17, the outer wall of the soap film tube is provided with a soap film tube support 20, and the soap film tube is above the crack 25 of the film lifting ring 17. The stent 20 is provided with a membrane-breaking column 26 . The membrane-breaking column 26 is a cylindrical structure. When the membrane-breaking ring 17 moves below the membrane-breaking column 26, the membrane-breaking column 26 presses the membrane-breaking ring 17 to give it a downward force, and because of the crack 25 on the membrane-breaking ring 17. Existing, the crack 25 of the film lifting ring 17 gradually increases, thereby tearing the soap film downward. The film lifting spring 7, the film pulling rod and the film lifting button 6 are used as the lifting device of the film lifting ring 17. The film pulling rod passes through the film elastic yellow 7 , one end is connected with the film pulling button 6 , and the other end is connected with the film pulling ring 17 . The plane where the film lifting ring 17 is located is parallel to the plane where the lower nozzle of the soap film tube is located. The film-lifting ring is connected to the film-lifting ring pull rod 8 perpendicular to the plane where the film-lifting ring 17 is located.

Example 8

As shown in FIG. 11 , the difference between this embodiment and Embodiment 7 is that the shape of the membrane-breaking column 26 is not cylindrical, but a columnar structure with thinner upper and lower ends and a thicker middle. Other structures are the same as those of Embodiment 7. This will not be repeated.

The film lifting ring 17 has a crack 25, the direction of the crack 25 is vertical downward, the crack 25 cuts the film lifting ring 17, the outer wall of the soap film tube is provided with a soap film tube support 20, and the soap film is above the crack 25 of the film lifting ring 17. The tube holder 20 is provided with a membrane-breaking column 26 . The membrane-breaking column 26 is of a structure that is thick at the top and narrow at the bottom. When the membrane-breaking ring 17 moves below the membrane-breaking column 26, the narrow opening of the membrane-breaking column 26 enters the membrane-breaking ring 17. The membrane column 26 becomes thicker gradually, and the membrane breaking column 26 gives the membrane ring 17 an outward supporting force, and because of the existence of the crack 25 on the membrane lift ring 17, the crack 25 of the membrane lift ring 17 gradually increases, thereby tearing outward. Cracked soap film. The film lifting spring 7, the film pulling rod and the film lifting button 6 are used as the lifting device of the film lifting ring 17. The film pulling rod passes through the film elastic yellow 7 , one end is connected with the film pulling button 6 , and the other end is connected with the film pulling ring 17 . The plane where the film lifting ring 17 is located is parallel to the plane where the lower nozzle of the soap film tube is located. The film-lifting ring is connected to the film-lifting ring pull rod 8 perpendicular to the plane where the film-lifting ring 17 is located.

Although the specific embodiments of the present invention are described above, those skilled in the art should understand that these are only examples, and the present invention is not limited to the above-mentioned best embodiments. Products of various forms, but any changes in their shape or structure, all have the same or similar technical solutions as the present application, all fall within the protection scope of the present invention.

Claims (10)

1. The utility model provides a measure large-traffic soap film flowmeter, includes cavity, soap film pipe, soap lye pond, plays membrane ring sum skinning ring elevating gear, goes up cavity and soap film pipe outer wall upper portion sealing connection, and skinning ring is connected its characterized in that with skinning ring elevating gear: the soap film tube has at least two, and the upper part and the lower part of the outer wall of each soap film tube are respectively provided with an infrared pair tube.

2. The soap film flowmeter for measuring high flow rate according to claim 1, wherein: the soap film pipe shares one film forming ring.

3. The mass flow soap film flowmeter of claim 2, characterized by: the film forming ring is non-perfect circle.

4. A high flow soap film flowmeter according to claims 1-3, characterized by: the soap film pipes are evenly distributed.

5. The mass flow soap film flowmeter of claim 4, wherein: the film forming ring is connected with the two film forming ring lifting devices.

6. A soap film flow meter according to claims 1-3, wherein: the film-forming ring is provided with a crack.

7. The soap film flowmeter of claim 6, wherein: the film breaking column is arranged in the moving direction of the film forming ring.

8. The mass flow soap film flowmeter of claim 7, wherein: the soap film pipe outer wall is provided with a soap film pipe support, and the soap film pipe support is provided with a film breaking column.

9. The mass flow soap film flowmeter of claim 8, wherein: the film forming ring is subjected to the force of the film breaking column in the moving direction of the film forming ring to break the film forming ring along the crack.

10. The mass flow soap film flowmeter of claim 8, wherein: the film forming ring is subjected to the force of the film breaking column in the direction perpendicular to the movement direction of the film forming ring, so that the film forming ring is broken along the crack.

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