A soap film flow meter

Abstract

The present invention belongs to the technical field of measuring the flow of fluids continuously passing through an instrument, and discloses a soap film flowmeter, comprising a soap film tube, an upper infrared transmitting tube and an upper infrared receiving tube arranged on the upper part of the outer wall of the soap film tube, a lower infrared transmitting tube and a lower infrared receiving tube arranged on the lower part of the outer wall of the soap film tube, a soap liquid pool and a film-forming ring arranged under the soap film tube, and the film-forming ring is provided with a film-breaking structure. The technical solution tears or vibrates the annular film formed by the outer wall of the soap film tube and the inner wall of the film-forming ring through the crack of the film-forming ring under the action of a film-breaking column and a spring, thereby successfully breaking the film, avoiding the generation of double films, making the measurement condition ideal, and making the detection data accurate.

Description

Technical Field

[0001] The invention belongs to the technical field of measuring the flow of a fluid continuously passing through an instrument, and in particular relates to a soap film flow meter that avoids double films. Background Art

[0002] In the prior art, the structure of the soap film flowmeter is a soap film tube with a scale, an air inlet is provided below the soap film tube, the lower end of the soap film tube is connected to a film ring, and soap film liquid is provided below the film ring. The working principle is as follows: the gas to be measured enters the soap film tube through the air inlet at the lower end of the soap film tube, the film ring generates a soap film from the soap film liquid, and then starts to move upward, and the soap film rises at a uniform speed along the soap film tube. When the soap film rises to the lower scale line of the soap film tube, the timer starts timing, and when the soap film rises to the upper scale line of the soap film tube, the timer stops timing. The instantaneous flow rate flowing through the soap film flowmeter can be calculated from the measured time and the volume between the two scale lines of the soap film tube. In the electronic soap film flowmeter, when the soap film passes through the lower limit and upper limit of a pair of sensors installed on the outer wall during the rising process, the display instrument directly displays the instantaneous flow rate, making the measurement data more accurate.

[0003] However, in actual work, the above theoretical content has defects. In the actual operation, after the film-lifting button is pressed for the first time, a ring-shaped soap film will be formed on the outer wall of the soap film tube and the inner wall of the film-lifting ring. When the film-lifting button is pressed for the second time, the film-lifting ring falls to the lower end of the soap film tube to form a new film that will cover the soap film tube. When the film-lifting ring is immersed in the soap liquid and the film-lifting button is released, the film-lifting ring moves upward under the elastic force of the spring. When the film-lifting ring is separated from the soap film liquid surface, a film will be formed again. In this way, two films will be formed in the process of pressing the film-lifting button once. In this way, it is necessary to record the time points when the two films pass through the two sets of sensors respectively, and calculate the time difference between each film passing through the two sets of sensors, and find the average value, which is the time difference × the volume of the soap film tube between the known sensor cross section = the flow rate per unit time through the soap film tube (unit L / min). Such a solution is not only cumbersome to calculate and interferes with the calculation of flow, but also once any film breaks during the movement, resulting in data loss, it will cause measurement failure.

[0004] Therefore, it is necessary to provide a soap film flowmeter that avoids the generation of double films. Summary of the invention

[0005] As attached Figure 1The figure shows the principle of the soap film flowmeter of the prior art, the soap film tube is connected to the upper cavity, the upper cavity is provided with an exhaust port, a sealing ring is provided between the upper cavity and the soap film tube, an upper infrared transmitting tube and an upper infrared receiving tube are provided on the upper part of the soap film tube, a lower infrared transmitting tube and a lower infrared receiving tube are provided on the lower part of the soap film tube, a soap liquid pool is provided under the soap film tube, the soap liquid pool contains soap film liquid, a film-lifting ring is immersed in the soap film liquid, the film-lifting ring pulls up the soap film to cover the lower end of the soap film tube, the exhaust port starts to exhaust air, the soap film rises in the soap film tube, passes through the lower infrared transmitting tube and the lower infrared receiving tube of scale B, and 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, the time when the soap film goes from scale B to scale A and the volume of the gas are recorded, and the flow rate of the gas can be known.

[0006] In view of the defect of the prior art, this solution is proposed, aiming at providing a soap film flowmeter that avoids double membranes. This is achieved through the following solution.

[0007] The soap film flowmeter comprises a soap film tube, an upper infrared transmitting tube and an upper infrared receiving tube arranged at the upper part of the outer wall of the soap film tube, a lower infrared transmitting tube and a lower infrared receiving tube arranged at the lower part of the outer wall of the soap film tube, a soap liquid pool and a film-lifting ring arranged under the soap film tube, wherein the diameter of the film-lifting ring is not less than the diameter of the soap film tube, the film-lifting ring is connected to a film-lifting ring lifting device, and the film-lifting ring is provided with a film-breaking structure. The film-lifting ring lifting device comprises a film-lifting spring, a film-lifting pull rod and a film-lifting button. The film-lifting pull rod passes through the film-lifting spring, one end of which is connected to the film-lifting button, and the other end is connected to the film-lifting ring. The plane of the film-lifting ring is parallel to the plane where the lower pipe opening of the soap film tube is located.

[0008] The film-lifting ring pull rod is vertically connected to the film-lifting ring plane. Further, the film-breaking structure is a crack of the film-lifting ring.

[0009] Furthermore, the crack runs through the membrane-lifting ring, that is, the crack cuts off the membrane-lifting ring, so that the membrane-lifting ring is overlapped together at the crack.

[0010] Furthermore, the crack direction is obliquely downward.

[0011] Furthermore, a film-breaking column is provided within the movement range of the film-breaking ring crack.

[0012] Furthermore, a soap film tube support is provided on the outer wall of the soap film tube, and a film breaking column is provided on the soap film tube support.

[0013] Furthermore, a membrane breaking column is provided on the membrane removing ring.

[0014] Furthermore, the film-lifting ring is subjected to a force from the film-breaking device in the moving direction of the film-lifting ring, so that the film-lifting ring is broken along the crack.

[0015] Furthermore, the film-lifting ring is subjected to a force from the film-breaking device in a direction perpendicular to the film-lifting ring and the moving direction, so that the film-lifting ring is broken along the crack.

[0016] The technical solution tears or vibrates the annular film formed by the outer wall of the soap film tube and the inner wall of the film-forming ring through the inertia of the film-forming ring or the crack of the film-forming ring under the action of the film-forming column and the spring, thereby successfully breaking the film, avoiding the generation of double films, idealizing the measurement conditions, and making the detection data accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 : Schematic diagram of the structural principle of a standard soap film flowmeter in the prior art.

[0018] Figure 2 : Schematic diagram of the structure of soap film flowmeter embodiment 1 of the present invention.

[0019] Figure 3 : Schematic diagram of the structure of soap film flowmeter embodiment 2 of the present invention.

[0020] Figure 4 : Diagram of the film-forming ring structure of soap film flowmeter embodiment 2 of the present invention.

[0021] Figure 5 : A schematic structural diagram of Example 3 of the soap film flowmeter of the present invention.

[0022] Figure 6 : A schematic structural diagram of Example 4 of the soap film flowmeter of the present invention.

[0023] Wherein: 1. upper cavity, 2. sealing ring, 3. air extraction port, 4. upper infrared transmitting tube, 5. upper infrared receiving tube, 6. soap film tube, 7. lower infrared transmitting tube, 8. lower infrared receiving tube, 9. film removing ring, 10. soap liquid pool, 11. soap film liquid, 12. soap film tube bracket, 13. film removing button, 14. film removing spring, 15. film removing ring pull rod, 16. film breaking column; 17. crack. DETAILED DESCRIPTION

[0024] The technical solution is described in detail according to the accompanying drawings.

[0025] The soap film flowmeter of the present invention comprises a soap film tube 6, an upper infrared emitting tube 4 and an upper infrared receiving tube 5 arranged on the upper part of the outer wall of the soap film tube 6, a lower infrared emitting tube 7 and a lower infrared receiving tube 8 arranged on the lower part of the outer wall of the soap film tube 6, a soap liquid pool 10 and a film-forming ring 9 arranged under the soap film tube 6, the diameter of the film-forming ring 9 is not less than the diameter of the soap film tube 6, the film-forming ring 9 is connected to a film-forming ring lifting device, and the film-forming ring 9 is provided with a film-breaking structure.

[0026] The principle of the soap film flowmeter is to tear the soap film by setting a film breaking structure, destroy the annular soap film between the film ring 9 and the outer wall of the soap film tube 6, so that before the film ring 9 is immersed in the soap liquid pool 10 next time, there is no soap film on the film ring 9.

[0027] Example 1

[0028] This embodiment is under standard conditions (i.e., standard conditions): the temperature is 0°C (273.15K), the pressure is 101.325 kPa (1 standard atmosphere, 760 mmHg), and the upper end of the soap film tube is connected to the measured gas flow interface.

[0029] like Figure 2 As shown, the soap film flowmeter is provided with a soap film tube 6, an upper infrared emitting tube 4 and an upper infrared receiving tube 5 arranged on the upper part of the outer wall of the soap film tube 6, a lower infrared emitting tube 7 and a lower infrared receiving tube 8 arranged on the lower part of the outer wall of the soap film tube 6, a soap liquid pool 10 and a film-lifting ring 9 arranged under the soap film tube 6, the inner diameter of the film-lifting ring 9 is not less than the outer diameter of the soap film tube 6, the film-lifting ring 9 is connected to the film-lifting ring lifting device, and the film-lifting ring 9 is provided with a crack 17 at the connection between the film-lifting ring pull rod 15 and the film-lifting ring 9, the crack is in the direction of the slash " / ", and the two ends of the crack 17 are still joined or overlapped with each other, and the crack 17 can only enable the film-lifting ring 9 to be disconnected.

[0030] When the soap film flowmeter is used to measure flow, the film ring lifting device is pressed once, the film ring 9 is immersed in the soap liquid pool 10, the force applied to the film ring lifting device is removed, the film ring 9 is connected by the film ring pull rod 15 and bounces up under the action of the film spring 14, the soap film contacts the lower surface of the soap film tube 6, the lower surface of the soap film tube 6 is covered with soap film, and there is an annular soap film in the annular space between the outer wall of the soap film tube 6 and the film ring 9. Before the second measurement, the film pull rod 15 is pressed quickly and forcefully, and the end connected to the film ring pull rod 15 near the edge of the crack 17 rapidly drops under the action of force, while the other end of the crack 17 remains in its original position under the action of inertia, so that the film ring 9 has a relative movement at both ends of the crack 17, and the soap film in the annular space between the outer wall of the soap film tube 6 and the film ring 9 is torn by the relative movement brought by this inertia.

[0031] When the film-lifting ring 9 is immersed in the soap liquid pool 10 for the second time, the force on the film-lifting ring pull rod 15 is removed, and the film-lifting ring 9 is connected to the film-lifting spring 14 by the film-lifting ring pull rod 15 and bounces up. Since the film-lifting ring 9 is provided with a crack 17 at the connection between the film-lifting ring pull rod 15 and the film-lifting ring 9 and the crack is in the direction of the slash " / ", the end of the crack 17 connected to the film-lifting ring pull rod 15 near the edge is at the right end of the slash " / ", and the other end of the crack 17 is at the right end of the slash " / ". At the left end of the film-lifting ring, when the film-lifting ring pull rod 15 moves upward under the action of the film-lifting spring 14, the part of the film-lifting ring 9 at the right end of the slash " / " will move upward with the part of the film-lifting ring 9 at the left end of the slash " / ", so there is no relative motion problem caused by inertia, and the film-lifting ring 9 is connected as a whole by the film-lifting ring pull rod 15 and bounces up under the action of the film-lifting spring 14, and the soap film contacts the lower surface of the soap film tube 6, and the lower surface of the soap film tube 6 is covered with soap film, completing the second measurement.

[0032] Each time a measurement is completed, the time it takes 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 time difference × the volume of the soap film tube between the cross sections of the soap film tube = the flow rate passing through the soap film tube per unit time (unit L / min). If it is not under standard conditions, use the known compensation formula for conversion.

[0033] Example 2

[0034] like Figure 3 and Figure 4 As shown, the film-lifting ring 9 has a crack 17, and the direction of the crack 17 is obliquely downward. The crack 17 cuts off the film-lifting ring 9. The outer wall of the soap film tube 6 is provided with a soap film tube support 12, and a film-breaking column 16 is provided on the soap film tube support 12 above the crack 17 of the film-lifting ring 9. The film-breaking column 16 is a cylindrical structure. When the film-lifting ring 9 moves below the film-breaking column 16, the film-breaking column 16 presses the film-lifting ring 9 to give it a downward force. Due to the existence of the crack 17 on the film-lifting ring 9, the crack of the film-lifting ring 9 gradually increases, thereby tearing the soap film downward. The film-lifting spring 14, the film-lifting rod 15 and the film-lifting button 13 serve as a film-lifting ring lifting device. The film-lifting rod 15 passes through the film-lifting spring 14, one end is connected to the film-lifting button 13, and the other end is connected to the film-lifting ring 9. The plane where the film-lifting ring 9 is located is parallel to the plane where the lower tube mouth of the soap film tube 6 is located. The film-lifting ring rod 15 is perpendicular to the plane where the film-lifting ring 9 is located and connected to it.

[0035] Example 3

[0036] like Figure 5 As shown, the film-lifting ring 9 has a crack 17, and the direction of the crack 17 is vertically downward. The crack 17 cuts off the film-lifting ring 9. The outer wall of the soap film tube 6 is provided with a soap film tube support 12, and a film-breaking column 16 is provided on the soap film tube support 12 above the crack 17 of the film-lifting ring 9. The film-breaking column 16 is a thick upper and narrow lower structure. When the film-lifting ring 9 moves below the film-breaking column 16, the narrow mouth of the film-breaking column 16 enters the film-lifting ring 9. As the film-lifting ring 9 continues to move upward, the film-breaking column 16 gradually becomes thicker. The film-breaking column 16 gives the film-lifting ring 9 an outward supporting force. Because of the existence of the crack 17 on the film-lifting ring 9, the crack of the film-lifting ring 9 gradually increases, thereby tearing the soap film outward. The film-lifting spring 14, the film-lifting rod 15 and the film-lifting button 13 serve as the film-lifting ring lifting device. The film-lifting rod 15 passes through the film-lifting spring 14, one end is connected to the film-lifting button 13, and the other end is connected to the film-lifting ring 9. The plane where the film-lifting ring 9 is located is parallel to the plane where the lower pipe opening of the soap film tube 6 is located. The film-lifting ring pull rod 15 is perpendicular to the plane where the film-lifting ring 9 is located and is connected thereto.

[0037] Example 4

[0038] like Figure 6As shown, the film-lifting ring 9 has a crack 17, and the crack 17 is V-shaped. The crack 17 cuts off the film-lifting ring 9. The outer wall of the soap film tube 6 is provided with a soap film tube bracket 12, and the film-lifting spring 14, the film-lifting rod 15 and the film-lifting button 13 serve as a film-lifting ring lifting device. The film-lifting rod 15 passes through the film-lifting spring 14, one end of which is connected to the film-lifting button 13, and the other end is connected to the film-lifting ring 9. The plane where the film-lifting ring 9 is located is parallel to the plane where the lower tube mouth of the soap film tube 6 is located. The film-lifting ring rod 15 is perpendicular to the plane where the film-lifting ring 9 is located and connected to it. When the film-lifting ring 9 moves downward, its upper side contacts the soap film. As the film-lifting ring 9 gradually moves downward, the upper edge of the film-lifting ring 9 is at the V-shaped position, tearing the soap film.

[0039] 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 optimal embodiments. Anyone can derive other various forms of products under the inspiration of the present invention. However, no matter what changes are made in the shape or structure, all technical solutions that are the same or similar to those of the present application fall within the scope of protection of the present invention.

Claims

1. A soap film flow meter, characterized in that: The invention comprises a soap film tube, an upper infrared transmitting tube and an upper infrared receiving tube arranged on the upper part of the outer wall of the soap film tube, a lower infrared transmitting tube and a lower infrared receiving tube arranged on the lower part of the outer wall of the soap film tube, a soap liquid pool and a film-lifting ring arranged under the soap film tube, wherein the film-lifting ring is provided with a film-breaking structure; a film-breaking column is provided in the moving direction of the film-lifting ring; the film-lifting ring is subjected to the force of the film-breaking column in the moving direction of the film-lifting ring so that the film-lifting ring is broken along the crack.

2. A soap film flowmeter according to claim 1, characterized in that: The film-lifting ring is provided with a crack.

3. A soap film flowmeter according to claim 2, characterized in that: The crack runs through the membrane ring.

4. A soap film flowmeter according to claim 3, characterized in that: The crack direction is obliquely downward.

5. A soap film flowmeter according to claim 4, characterized in that: The upper opening of the soap film tube is connected with an upper cavity body, and the upper cavity body is provided with an air extraction port.

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