Soap film flowmeter

Abstract

The utility model relates to the technical field of flow detection, in particular to a soap film flowmeter. The soap film flowmeter is used for testing the suction capacity of the smoking machine and comprises a liquid soap pool used for bearing liquid soap. At least part of the soap film tube is of a curve structure, a plurality of scale marks are arranged on the soap film tube, the scale marks are arranged at intervals in the extension direction of the soap film tube, the soap film tube is fixedly connected to the soap liquid pool, the soap film tube is provided with an air inlet and an air outlet, the air inlet is inserted into the soap liquid pool, and the air outlet is used for being connected with a smoking machine; the pressing piece is movably connected to the liquid soap pool, and a part of the pressing piece extends into the liquid soap pool; the soap film ring is arranged in the soap liquid pool, the soap film ring is connected to the end, stretching into the soap liquid pool, of the pressing piece, the soap film ring and the air inlet are correspondingly arranged, and the pressing piece drives the soap film ring to move between the air inlet and the soap liquid to form a soap film. At least part of the soap film tube is arranged to be of the curve structure, and the height of the soap film tube can be reduced.

Description

Technical Field

[0001] This application relates to the field of flow detection technology, specifically to a soap film flow meter. Background Technology

[0002] A soap film flow meter is an instrument that measures the flow rate of a gas or liquid by measuring the time it takes for the gas or liquid to flow through a certain volume. Currently, soap film flow meters used for calibrating the suction capacity of smoking machines can typically only calibrate smoking machines of standard capacity and cannot meet the calibration requirements of smoking machines of other capacities.

[0003] In related technologies, to enable soap film flow meters to calibrate smoking machines of different capacities, the metering tube of the soap film flow meter is usually made larger and longer, allowing for calibration of smoking machines with varying capacities. However, making the metering tube larger and longer results in an excessively large overall height of the soap film flow meter, causing inconvenience in its use. Utility Model Content

[0004] This application discloses a soap film flow meter to solve, or at least partially solve, the problem in the related art where the measuring tube of the soap film flow meter is usually made larger and longer so that the soap film flow meter can be calibrated for smoking machines of different capacities, resulting in an excessively large overall height of the soap film flow meter and causing inconvenience in its use.

[0005] To solve the above-mentioned technical problems, this application is implemented as follows:

[0006] This application discloses a soap film flow meter for testing the suction capacity of a smoking machine. The soap film flow meter includes a soap solution tank for holding soap solution; a soap film tube, at least partially curved, with multiple graduation lines spaced apart along its extension direction; the soap film tube is fixedly connected to the soap solution tank and has an air inlet and an air outlet, the air inlet being inserted into the soap solution tank and the air outlet being connected to the smoking machine; a pressing member movably connected to the soap solution tank, with a portion of the pressing member extending into the soap solution tank; and a soap film ring disposed within the soap solution tank, connected to the end of the pressing member extending into the soap solution tank, and corresponding to the air inlet of the soap film tube. The pressing member drives the soap film ring to move between the air inlet and the soap solution to form a soap film.

[0007] In some embodiments, the soap film tube has a zero mark that is flush with the air inlet of the soap film tube.

[0008] In some embodiments, the soap film tube has an enlarged portion disposed near the air inlet.

[0009] In some embodiments, the soap film flow meter further includes a filter element disposed inside the soap film tube and located near the outlet of the soap film tube.

[0010] In some embodiments, the filter element is a porous sand core structure, and the sidewall of the filter element abuts against the inner wall of the soap film tube.

[0011] In some embodiments, the soap film flow meter further includes: a fixing ring, the fixing ring being embedded in the soap solution tank, the pressing member being inserted into the fixing ring and movably connected to the inner wall of the fixing ring; and a spring, the end of the pressing member exposed in the soap solution tank being provided with a stop portion, the spring being sleeved on the pressing member, and one end of the spring abutting against the stop portion and the other end abutting against the fixing ring.

[0012] In some embodiments, the soap film flow meter further includes a baffle, the soap solution pool has a receiving cavity, and the baffle is disposed in the receiving cavity to divide the receiving cavity into a first receiving cavity and a second receiving cavity, the first receiving cavity being used to hold the soap solution.

[0013] In some embodiments, the first receiving cavity has an opening located at the top of the soap solution tank.

[0014] In some embodiments, the soap film flow meter further includes a fixing rod, one end of which is fixedly connected to the soap solution tank and the other end of which is fixedly connected to the outer wall of the soap film tube.

[0015] In some embodiments, the soap film tube is one of an S-type structure, a W-type structure, an M-type structure, or an N-type structure.

[0016] This application discloses a soap film flow meter for testing the suction capacity of a smoking machine. The soap film flow meter includes a soap solution tank for holding soap solution; a soap film tube, at least partially curved, with multiple graduation lines spaced apart along its extension direction; the soap film tube is fixedly connected to the soap solution tank and has an air inlet and an air outlet, the air inlet being inserted into the soap solution tank and the air outlet being connected to the smoking machine; a pressing member movably connected to the soap solution tank, with a portion of the pressing member extending into the soap solution tank; and a soap film ring disposed within the soap solution tank, connected to the end of the pressing member extending into the soap solution tank, and corresponding to the air inlet of the soap film tube. The pressing member drives the soap film ring to move between the air inlet and the soap solution to form a soap film.

[0017] The soap film flow meter disclosed in this application improves the ease of use of the soap film flow meter by reducing the height of the soap film tube by setting at least part of the soap film tube with a curved structure.

[0018] Furthermore, by setting multiple scale lines on the soap film tube, with these scale lines spaced apart along the extension direction of the soap film tube, the soap film flow meter can calibrate the suction capacity of smoking machines of different capacities, thereby meeting the calibration requirements of the suction capacity of smoking machines of different capacities and improving the utilization rate of the soap film flow meter. Attached Figure Description

[0019] Figure 1 This diagram illustrates the structure of the soap film flow meter described in the embodiments of this application. Figure 1 ;

[0020] Figure 2 This diagram illustrates the structure of the soap film flow meter described in the embodiments of this application. Figure 2 .

[0021] Figure label:

[0022] 10: Soap solution tank; 11: First receiving cavity; 111: Opening; 12: Second receiving cavity;

[0023] 20: Soap film tube; 21: Scale line; 22: Zero scale line; 23: Enlarged section; 24: Air inlet; 25: Air outlet;

[0024] 30: Pressing part; 31: Stop part;

[0025] 40: Soap film ring;

[0026] 50: Filter element;

[0027] 60: Retaining ring;

[0028] 70: Spring;

[0029] 80: partition;

[0030] 90: Fixed rod. Detailed Implementation

[0031] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0032] It should be understood that the phrase "one embodiment" or "an embodiment" throughout the specification means that a specific feature, structure, or characteristic related to the embodiment is included in at least one embodiment of this application. Therefore, "in one embodiment" or "in an embodiment" appearing throughout the specification does not necessarily refer to the same embodiment. Furthermore, these specific features, structures, or characteristics can be combined in any suitable manner in one or more embodiments.

[0033] Reference Figure 1 The diagram illustrates the structure of the soap film flow meter described in the embodiments of this application. Figure 1 ;reference Figure 2 The diagram illustrates the structure of the soap film flow meter described in the embodiments of this application. Figure 2 .

[0034] like Figure 1 and Figure 2 As shown in the figure, this application discloses a soap film flow meter for testing the suction capacity of a smoking machine. The soap film flow meter includes a soap solution tank 10 for holding soap solution; a soap film tube 20, at least partially curved, with multiple scale lines 21 spaced apart along the extension direction of the soap film tube 20; the soap film tube 20 is fixedly connected to the soap solution tank 10; and the soap film tube 20 has an air inlet 24 and an air outlet 25. The air inlet 24 is inserted into... Located within the soap solution tank 10, the air outlet 25 is used to connect to the smoking machine; the pressing member 30 is movably connected to the soap solution tank 10, and a portion of the pressing member 30 extends into the soap solution tank 10; the soap film ring 40 is located within the soap solution tank 10, and the soap film ring 40 is connected to the end of the pressing member 30 that extends into the soap solution tank 10, and the soap film ring 40 is correspondingly arranged with the air inlet 24 of the soap film tube 20. The pressing member 30 drives the soap film ring 40 to move between the air inlet 24 and the soap solution to form a soap film.

[0035] This application discloses a soap film flow meter for detecting gas or liquid flow rate. It is understood that the soap film flow meter calculates the flow rate by measuring the time it takes for a gas or liquid to flow through a certain volume. In some embodiments, the soap film flow meter can be used to detect the suction capacity of a smoking machine to calibrate the machine's suction capacity.

[0036] It should be noted that, in the embodiments of this application, the specific application of the soap film flow meter is not limited in many ways. The following will take the detection of the suction capacity of a smoking machine using a soap film flow meter as an example to describe the soap film flow meter disclosed in the embodiments of this application.

[0037] like Figure 1 and Figure 2As shown, the soap film flow meter disclosed in this application includes a soap solution tank 10, a soap film tube 20, a pressing member 30, and a soap film ring 40. The soap solution tank 10 encloses a receiving cavity for holding soap solution. In some embodiments, the soap solution tank 10 has a receiving cavity with an opening, allowing soap solution to be injected into the receiving cavity through the opening, thus carrying the soap solution through the receiving cavity.

[0038] The soap film tube 20 is fixedly connected to the soap solution tank 10. At least a portion of the soap film tube 20 has a curved structure. The soap film tube 20 has an air inlet 24 and an air outlet 25. The air inlet 24 is inserted into the soap solution tank 10, and the air outlet 25 is connected to the smoke extraction electrode. By making at least a portion of the soap film tube 20 curved, the height of the soap film tube 20 is reduced, thereby reducing the overall height of the soap film flow meter and improving its ease of use.

[0039] In some embodiments, the soap film tube 20 can be an S-shaped structure, a W-shaped structure, an M-shaped structure, or an N-shaped structure. By setting the soap film tube 20 to one of the above structures, the height of the soap film tube 20 is reduced, thereby reducing the overall height of the soap film flow meter and improving the ease of use of the soap film flow meter.

[0040] Of course, the above are just individual examples of the specific structure of the soap film tube 20 and are not intended to limit this application. In practical applications, those skilled in the art can also set the specific structure of the soap film tube 20 as needed.

[0041] It should be noted that in this embodiment, the air inlet 24 of the soap film tube 20 can be opposite to the air outlet 25 of the soap film tube 20, and the air inlet 24 of the soap film tube 20 can also face the same direction as the air outlet 25 of the soap film tube 20. In this embodiment, there is no limitation on the specific orientation of the air inlet 24 and the air outlet 25 of the soap film tube 20. In practical applications, technicians can set them as needed.

[0042] In this embodiment, the soap film tube 20 being fixedly connected to the soap solution tank 10 means that there is no relative movement between the soap film tube 20 and the soap solution tank 10. In some embodiments, the outer wall of the soap film tube 20 is fixedly connected to the outer wall of the soap solution tank 10, and the outer wall of the soap film tube 20 is snapped into the soap solution tank 10. In this embodiment, the specific method of fixing the soap film tube 20 to the soap solution tank 10 is not limited in many ways; in practical applications, those skilled in the art can set it as needed.

[0043] like Figure 1 and Figure 2As shown in the embodiment of this application, the soap film tube 20 is a transparent tube, and multiple scale lines 21 are provided on the soap film tube 20. The multiple scale lines 21 are spaced apart along the extension direction of the soap film tube 20. By providing multiple scale lines 21 on the soap film tube 20, and the multiple scale lines 21 being spaced apart along the extension direction of the soap film tube 20, the soap film flow meter can be calibrated for the suction capacity of smoking machines of different capacities, thereby meeting the calibration requirements of the suction capacity of smoking machines of different capacities and improving the utilization rate of the soap film flow meter.

[0044] In this embodiment, the pressing member 30 is movably connected to the soap bath 10. A portion of the pressing member 30 extends into the soap bath 10, while the other portion protrudes outside the soap bath 10. A soap film ring 40 is disposed within the soap bath 10 and is connected to the end of the pressing member 30 that extends into the soap bath 10. The soap film ring 40 is positioned opposite the air inlet 24 of the soap film tube 20 that extends into the soap bath 10. The pressing member 30 drives the soap film ring 40 to move between the air inlet 24 and the soap bath to form a soap film. That is, when the pressing member 30 is pressed down, the soap film ring 40 can come into contact with the soap bath in the soap bath 10, and a soap film will form on the soap film ring 40. When the pressing member 30 moves upward, the soap film ring 40 reaches the air inlet 24 of the soap film tube 20 that extends into the soap bath 10, and the soap film can contact the air inlet 24 of the soap film tube 20. When the smoke extractor is turned on, the soap film will move within the soap film tube 20. The suction capacity of the smoke extractor can be determined by the rise of the soap film within the soap film tube 20.

[0045] It should be noted that before calibrating the suction capacity of the smoking machine using the soap film flow meter, the soap film flow meter needs to be rinsed. The soap film flow meter disclosed in this application embodiment can be rinsed by repeatedly starting the smoking machine and simultaneously pressing down on the pressing element 30 multiple times to generate multiple soap films in the soap film tube 20.

[0046] The soap film flow meter disclosed in this application reduces the overall height of the soap film flow meter by setting at least a portion of the soap film tube 20 to a curved structure, thereby improving the ease of use of the soap film flow meter. Furthermore, by providing multiple scale lines 21 on the soap film tube 20, with the scale lines 21 spaced apart along the extension direction of the soap film tube 20, the soap film flow meter can be calibrated for the suction capacity of smoking machines of different capacities, meeting the calibration requirements of different capacity smoking machines and improving the utilization rate of the soap film flow meter.

[0047] In some embodiments, such as Figure 1 and Figure 2 As shown, the soap film tube 20 has a zero mark 22, which is flush with the air inlet 24 of the soap film tube 20.

[0048] like Figure 1 and Figure 2As shown in the embodiment of this application, the zero mark 22 of the soap film tube 20 is set to be flush with the air inlet 24 of the soap film tube 20. That is, the zero mark 22 of the soap film tube 20 is the end of the air inlet 24 of the soap film tube 20.

[0049] In this embodiment, by setting the zero mark 22 of the soap film tube 20 to be flush with the air inlet 24 of the soap film tube 20, the height of the soap film inside the soap film tube 20 needs to be adjusted when using the soap film flow meter to detect the suction capacity of the smoking machine. This helps to simplify the operation process of the soap film flow meter and make the use of the soap film flow meter more convenient.

[0050] In some embodiments, such as Figure 1 and Figure 2 As shown, the soap film tube 20 has an enlarged portion 23, which is located near the air inlet 24.

[0051] like Figure 1 and Figure 2 As shown, the soap film tube 20 in this embodiment includes a soap film tube body and an enlarged portion 23, also known as a large-bore tube. The diameter of the enlarged portion 23 is larger than the diameter of the soap film tube body, so as to increase the volume of the soap film tube 20 by enlarging the portion 23, further reducing the total height of the soap film tube 20, thereby further reducing the overall height of the soap film flow meter and improving the convenience of using the soap film flow meter.

[0052] It should be noted that in this embodiment, the enlarged part 23 is located near the air inlet 24 of the soap film tube 20 to avoid setting the scale line 21 on the enlarged part 23, which would result in the scale line 21 being not set in a precise position and would affect the accuracy of the soap film flow meter measurement.

[0053] In some embodiments, such as Figure 1 and Figure 2 As shown, the soap film flow meter also includes a filter element 50, which is disposed inside the soap film tube 20 and located near the outlet 25 of the soap film tube 20.

[0054] like Figure 1 and Figure 2 As shown in the embodiment of this application, a filter element 50 is provided inside the soap film tube 20. The filter element 50 is located near the air outlet 25 of the soap film tube 20 to intercept the soap film, protect the smoke extractor, and prevent the soap film from entering the smoke extractor and affecting its service life.

[0055] In some embodiments, such as Figure 1 and Figure 2 As shown, the filter element 50 has a porous sand core structure, and the sidewall of the filter element 50 abuts against the inner wall of the soap membrane tube 20.

[0056] like Figure 1 and Figure 2 As shown, in this embodiment, the filter element 50 is disposed inside the soap film tube 20, and the sidewall of the filter element 50 abuts against the inner wall of the soap film tube 20. It can be understood that the sidewall of the filter element 50 is interference-fitted with the inner wall of the soap film tube 20 so that the filter element 50 can be fixed inside the soap film tube 20.

[0057] It should be noted that the filter element 50 in this embodiment is a porous sand core structure. The filter element 50 is designed as a porous sand core structure so that it can effectively intercept soap film, protecting the smoke extractor and preventing soap film from entering and affecting its service life.

[0058] In some embodiments, such as Figure 1 and Figure 2 As shown, the soap film flow meter also includes a fixing ring 60, which is embedded in the soap solution tank 10. A pressing member 30 is inserted into the fixing ring 60 and movably connected to the inner wall of the fixing ring 60. A spring 70 is provided at the end of the pressing member 30 that is exposed in the soap solution tank 10, and the spring 70 is sleeved on the pressing member 30. One end of the spring 70 abuts against the stopping part 31, and the other end abuts against the fixing ring 60.

[0059] like Figure 1 and Figure 2 As shown in the embodiments of this application, the soap film flow meter also includes a fixing ring 60 and a spring 70. The fixing ring 60 is embedded in the top of the soap solution tank 10. In some embodiments, a through hole is provided in the top of the soap solution tank 10, and the fixing ring 60 is embedded in the through hole, with the outer wall of the fixing ring 60 and the inner wall of the through hole having an interference fit. Alternatively, the fixing ring 60 can be a fixing screw with external threads, and the top of the soap solution tank 10 has a through hole with internal threads on its inner wall; the fixing screw is installed in the through hole, with the internal threads engaging with the external threads.

[0060] In this embodiment, the pressing member 30 is inserted into the fixing ring 60. A portion of the pressing member 30 extends into the soap solution tank 10, while the other portion protrudes from the soap solution tank 10. The pressing member 30 can move up and down relative to the fixing ring 60. A stop portion 31 is provided at the end of the pressing member 30 that protrudes from the soap solution tank 10. A spring 70 is sleeved on the pressing member 30, with one end of the spring 70 abutting against the stop portion 31 and the other end abutting against the fixing ring 60.

[0061] Using a soap film flow meter, pressing down on the pressing member 30 allows the soap film ring 40 to come into contact with the soap solution in the soap solution tank 10, forming a soap film on the ring 40. When pressing down on the pressing member 30 stops, the pressing member 30 moves upward under the force of the spring 70, and the soap film ring 40 reaches the air inlet 24 of the soap film tube 20 where it enters the soap solution tank 10, allowing the soap film to contact the air inlet 24. When the smoke extractor is started, the soap film moves within the soap film tube 20. The suction capacity of the smoke extractor can be determined by the rise of the soap film within the soap film tube 20. In other words, in this embodiment, the fixing ring 60 and the spring 70 provide elasticity to the pressing member 30, enabling the pressing member 30 to move automatically upward under the action of this elasticity.

[0062] In some embodiments, such as Figure 1 and Figure 2 As shown, the soap film flow meter also includes a partition 80. The soap liquid tank 10 has a receiving cavity. The partition 80 is disposed in the receiving cavity to divide the receiving cavity into a first receiving cavity 11 and a second receiving cavity 12. The first receiving cavity 11 is used to hold the soap liquid.

[0063] like Figure 1 and Figure 2 As shown, the soap solution tank 10 disclosed in this application embodiment has a receiving cavity, and a partition 80 is disposed in the receiving cavity. The partition 80 can divide the receiving cavity into a first receiving cavity and a second receiving cavity, and the soap solution is carried through the first receiving cavity.

[0064] The partition 80 in this embodiment reduces the volume of the first receiving cavity, allowing it to hold less soap solution to meet the requirements of the soap film flow meter. In other words, the partition 80 helps reduce the amount of soap solution required by the soap film flow meter, thereby lowering its operating cost.

[0065] In some embodiments, such as Figure 1 and Figure 2 As shown, the first receiving cavity 11 has an opening 111, which is located at the top of the soap solution tank 10.

[0066] like Figure 1 and Figure 2 As shown, in this embodiment of the application, the first receiving cavity 11 has an opening 111, which is located at the top of the soap solution tank 10. The opening 111 can also serve as an air inlet 24 for the first receiving cavity 11 when used as a soap film flow meter. Furthermore, soap solution can also be added into the first receiving cavity 11 through the opening 111.

[0067] In some embodiments, such as Figure 1 and Figure 2As shown, the soap film flow meter also includes a fixing rod 90, one end of which is fixedly connected to the soap solution tank 10, and the other end is fixedly connected to the outer wall of the soap film tube 20.

[0068] like Figure 1 and Figure 2 As shown in the embodiment of this application, one end of the fixing rod 90 is fixedly connected to the top of the soap liquid tank 10, and the other end of the fixing rod 90 is fixedly connected to the outer wall of the soap film tube 20, so as to fix the soap film tube 20 to the soap liquid tank 10 by means of the fixing rod 90.

[0069] In some embodiments, one end of the fixing rod 90 is bonded to the top of the soap solution tank 10, and the other end of the fixing rod 90 is bonded to the outer wall of the soap film tube 20. Of course, in this embodiment, there are no restrictions on the specific connection method between the fixing rod 90 and the soap solution tank 10 and the soap film tube 20. In actual applications, technicians can set it as needed.

[0070] In some embodiments, such as Figure 1 and Figure 2 As shown, the diameter of the soap film ring 40 is greater than or equal to the diameter of the air inlet 24 of the soap film tube 20.

[0071] In this embodiment, the diameter of the soap film ring 40 is set to be greater than or equal to the diameter of the air inlet 24 of the soap film tube 20, so that the soap film generated by the soap film ring 40 can cover the soap film tube 20, avoiding the soap film generated by the soap film ring 40 being too small to cover the entire inner diameter of the soap film tube 20.

[0072] This application discloses a soap film flow meter for testing the suction capacity of a smoking machine. The soap film flow meter includes a soap solution tank for holding soap solution; a soap film tube, at least partly curved, with multiple graduation lines spaced apart along its extension direction; a soap film tube fixedly connected to the soap solution tank; an air inlet and an air outlet, the air inlet inserted into the soap solution tank and the air outlet connected to the smoking machine; a pressing member movably connected to the soap solution tank, with a portion extending into the soap solution tank; and a soap film ring disposed within the soap solution tank, connected to the end of the pressing member extending into the soap solution tank, with the soap film ring corresponding to the air inlet of the soap film tube. The pressing member drives the soap film ring to move between the air inlet and the soap solution to form a soap film.

[0073] The soap film flow meter disclosed in this application improves ease of use by reducing the height of the soap film tube by setting at least a portion of it to a curved structure. Furthermore, by providing multiple graduation lines on the soap film tube at intervals along its extension direction, the flow meter can be calibrated for smoking machines of different capacities to meet the calibration requirements of different smoking machine suction capacities, thereby improving the utilization rate of the soap film flow meter.

[0074] It should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0075] Although optional embodiments of the present application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the optional embodiments as well as all changes and modifications falling within the scope of the embodiments of the present application.

[0076] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used merely to distinguish one entity from another, and do not necessarily require or imply any such actual relationship or order between these entities. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that an article or terminal device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such an article or terminal device. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the article or terminal device that includes that element.

[0077] The technical solutions provided in this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the principles and implementation methods of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A soap film flowmeter for testing the puff volume of a smoking machine, characterized in that, The soap film flowmeter comprises: a soap solution pool (10) for carrying soap solution; a soap film tube (20) having at least a part of a curved structure, a plurality of scale lines (21) being arranged on the soap film tube (20) and spaced along the extension direction of the soap film tube (20), the soap film tube (20) being fixedly connected to the soap solution pool (10), the soap film tube (20) having an air inlet (24) and an air outlet (25), the air inlet (24) being inserted into the soap solution pool (10), and the air outlet (25) being used for connecting the smoking machine; a pressing piece (30) movably connected to the soap solution pool (10), and a part of the pressing piece (30) extending into the soap solution pool (10); a soap film ring (40) arranged in the soap solution pool (10), the soap film ring (40) being connected to the end of the pressing piece (30) extending into the soap solution pool (10), and the soap film ring (40) being arranged in correspondence with the air inlet (24) of the soap film tube (20), the pressing piece (30) driving the soap film ring (40) to move between the air inlet (24) and the soap solution to form a soap film.

2. The meter according to claim 1, wherein The soap film tube (20) has a zero scale line (22) flush with the air inlet (24) of the soap film tube (20).

3. The meter according to claim 1, wherein The soap film tube (20) has an enlarged portion (23) arranged at a position close to the air inlet (24) of the soap film tube (20).

4. The meter according to claim 1, wherein The soap film flowmeter further comprises: a filter (50) arranged in the soap film tube (20) and located at a position close to the air outlet (25) of the soap film tube (20).

5. The meter according to claim 4, wherein The filter (50) is a porous sand core structure, and the side wall of the filter (50) abuts against the inner wall of the soap film tube (20).

6. The meter of claim 1 wherein, The soap film flowmeter further comprises: a fixing ring (60) embedded in the soap solution pool (10), the pressing piece (30) being inserted into the fixing ring (60) and movably connected to the inner wall of the fixing ring (60); a spring (70), the end of the pressing piece (30) exposed to the soap solution pool (10) being provided with a stop portion (31), the spring (70) being sleeved on the pressing piece (30), one end of the spring (70) abutting against the stop portion (31), and the other end abutting against the fixing ring (60).

7. The meter of claim 1 wherein, The soap film flowmeter further comprises a partition plate (80), the soap solution pool (10) having a containing cavity, the partition plate (80) being arranged in the containing cavity to divide the containing cavity into a first containing cavity (11) and a second containing cavity (12), and the first containing cavity (11) being used for carrying soap solution.

8. The meter according to claim 7, wherein The first containing cavity (11) has an opening (111) arranged at the top of the soap solution pool (10).

9. The restrictor according to claim 1, wherein The soap film flowmeter further comprises: A fixed rod (90) is fixedly connected at one end to the soap pool (10) and at the other end to the outer wall of the soap film tube (20).

10. The restrictor according to any one of claims 1 to 9, wherein The soap film tube (20) is in one of S-shaped structure, W-shaped structure, M-shaped structure or N-shaped structure.

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