Multi-phase flow metering device based on air pressure sensor

Abstract

The invention discloses a multiphase flow metering device based on a baroceptor.The multiphase flow metering device comprises a spiral separator, a connecting pipe is fixedly installed at one end of the spiral separator, a detection pipe is fixedly connected to one end of the connecting pipe, a sealing ring is fixedly installed in the detection pipe, and the sealing ring is fixedly connected to the other end of the spiral separator; a flow dividing pipe is fixedly installed outside the detection pipe, the input end and the output end of the flow dividing pipe are close to the two sides of the sealing ring respectively, an air outlet hole is formed in the top of the airflow box, a first water-permeable molecular film is fixedly installed at one end in the airflow box, and a sealing plate is fixedly installed at the other end in the airflow box; according to the multiphase flow metering device based on the gas pressure sensor, after gas separation, liquid makes contact with the adsorption pipe along the bottom of the gas flow box, then the liquid makes contact with the overflowing ring in the adsorption pipe and drives the magnet to rotate after penetrating through the overflowing ring, and gravel particles are adsorbed when the magnet rotates.

Description

Technical Field

[0001] The invention relates to the technical field of multiphase flow metering, and in particular to a multiphase flow metering device based on an air pressure sensor. Background Art

[0002] The multiphase flow metering device can accurately detect the amount of pipeline flow and estimate the internal environment of the pipeline. It is used in production inspections of various industries and provides a highly stable and clean processing environment for the processing and treatment of various industrial fields and devices. The industrial supporting device includes a system that is mainly composed of vacuum components, including spiral separators, vacuum booster pumps, vacuum valves, vacuum seals, pressure gauge observation windows, and environmental protection equipment. The multiphase flow metering device is a core component for accurately controlling and detecting fluid flow.

[0003] Although the multiphase flow device can separate oil, gas and liquid in advance, when separating liquids such as crude oil, the oil well crude oil contains a large amount of gas. The fluid in the oil well contains corrosive media and solid particles, such as CO2 and sand. Some gases can be transported through pipelines for recycling, and some gases become waste gases such as impurity waste gases such as CO2 and sand. They are extracted by the pump along with the crude oil and contained in the crude oil. The existing multiphase flow device works according to physical principles. A retaining ring is installed inside the multiphase flow device. The function of the retaining ring is to block the fluid at the input end of the pipeline, thereby forming a pressure difference between the input end and the output end of the pipeline, so as to display the flow rate of the fluid inside the pipeline on the instrument. However, during the use process, CO2 and sand will accumulate too much, and the erosion of the retaining ring by sand will affect the judgment of the pressure gauge and produce harmful sources. The excessive content of CO2 will be transformed into carbonic acid after contact with water, which will cause corrosion or erosion to the sensor and probe, resulting in sensor count drift, thereby affecting the measurement accuracy. For this reason, we propose a multiphase flow metering device based on a pressure sensor. Summary of the invention

[0004] The object of the present invention is to provide a multiphase flow metering device based on an air pressure sensor to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a multiphase flow metering device based on an air pressure sensor, comprising a spiral separator, a connecting tube is fixedly installed at one end of the spiral separator, a detection tube is fixedly connected to one end of the connecting tube, a sealing ring is fixedly installed inside the detection tube, a shunt tube is fixedly installed outside the detection tube, the input end and the output end of the shunt tube are respectively close to the two sides of the sealing ring, an air flow box is fixedly connected to the shunt tube, an air outlet is opened on the top of the air flow box, a first water-permeable molecular membrane is fixedly installed at one end of the air flow box, and the air flow box A sealing plate is fixedly installed at the other end, an adsorption tube is fixedly connected to the bottom of the airflow box, a flow ring is fixedly installed on one side of the adsorption tube, and a magnet is rotatably connected inside the flow ring; a first pressure differential tube is fixedly connected to one end of the top of the detection tube, and a second pressure differential tube is fixedly connected to the other end of the detection tube, and flow detection meters are fixedly installed on the top of the first and second pressure differential tubes. When pressure is generated inside the detection tube, the fluid inside the detection tube is introduced into the airflow box and the adsorption tube through one end of the shunt tube, and then re-lead out to the inside of the detection tube through the other end of the airflow box.

[0006] Preferably, baffles are fixedly installed at both ends of the inner circle of the detection tube, and a limiting plate is fixedly connected between the two baffles. The limiting plate divides the interior of the detection tube into two areas, a gas part and a liquid part. A pair of connecting holes are opened on the limiting plate, and the first pressure differential tube and the second pressure differential tube are fixedly connected to each connecting hole respectively. An installation tunnel is opened on the top of the detection tube, and an integrated diversion box is detachably connected to the installation tunnel.

[0007] Preferably, a second water-permeable molecular membrane is fixedly installed at one end of the limiting plate, a solenoid valve is fixedly connected inside the integrated diversion box, a valve head is fixedly connected to the bottom of the solenoid valve, a limiting plate is fixedly installed on one side of the valve head, the limiting plate and the sealing ring are movably connected, a first connecting pipe is fixedly installed on one side of the integrated diversion box, the second pressure differential tube and the first connecting pipe are detachably connected together, a detection sensor is fixedly installed on the other side of the integrated diversion box, a flow channel through which gas can pass is formed around the detection sensor and between the limiting plate, a second connecting pipe is opened between the solenoid valve and the detection sensor, an air pressure detection gauge is fixedly connected to the top of the second connecting pipe, and the air pressure detection gauge and the flow detection gauge are fixed together.

[0008] Preferably, a first spring is fixedly connected to the bottom of the second connecting pipe, a seating block is fixedly connected to the bottom of the first spring, a pair of air outlet holes are provided on one side of the seating block, a docking hole is provided inside the integrated diversion box, and the docking hole is located between the seating block and the detection sensor.

[0009] Preferably, a connecting plate is fixedly connected to the other side of the valve head, one end of the connecting plate is located at the top of the seating block, an air hole is opened at the top of the seating block, the gas part in the detection tube is connected to the air pressure detection gauge through the air hole, when the solenoid valve is powered off and drives the valve head to descend, the connecting plate drives the seating block to descend, the air outlet and the docking hole located at the top of the seating block are separated, and the air outlet located at the lowest point of the seating block descends to the inside of the gas part in the detection tube.

[0010] Preferably, the side of the detection sensor facing the second water-permeable molecular membrane is a heating section, and the side facing the docking hole is a cooling section.

[0011] Preferably, a baffle ring is fixedly installed on one side of the sealing ring, a second spring is fixedly connected to one side of the inner part of the baffle ring, one end of the second spring is fixedly connected to the first movable ring, a fixed plate is fixedly installed on one side of the first movable ring, and one side of the fixed plate is fixedly connected to the second movable ring. When the limit plate descends, the other side of the first movable ring is blocked, and when the valve head is energized to rise and the limit plate and the first movable ring separate the liquid passing through the liquid part of the detection tube, the second movable ring is flush with one end of the baffle ring.

[0012] Preferably, one end of the diverter pipe is located between the sealing ring and the retaining ring, and the area of ​​the sealing ring is twice that of the retaining ring.

[0013] Preferably, the first water-permeable molecular membrane is arc-shaped, and the inner circle of the first water-permeable molecular membrane is connected to the input end of the detection tube, and the side surface of the adsorption tube covers half of the top area of ​​the flow ring.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] In the process of the liquid passing through the first water-permeable molecular membrane of the present invention, the liquid produces a top-up phenomenon on the first water-permeable molecular membrane. As the internal pressure of the shunt tube increases, the gas inside the liquid penetrates the first water-permeable molecular membrane. After the gas is separated, the liquid contacts the adsorption tube along the bottom of the airflow box. Then, the liquid contacts the flow ring inside the adsorption tube. After passing through the flow ring, the magnet is driven to rotate. The magnet adsorbs sand and gravel particles when rotating. Finally, the liquid passes through the other end of the airflow box and flows out to the output end of the detection tube. At the same time, when the liquid flows inside the detection tube, the flow detection meter detects the liquid flow. The sensors inside the first differential pressure tube and the second differential pressure tube can be extended close to the inside of the detection tube, thereby reducing the influence of corrosive gas on the sensor probe and preventing the problem of excessive impurities in the crude oil interfering with the sensor device.

[0016] When the solenoid valve is energized, the valve on the shunt pipe opens, the valve head rises, and the first movable circle is released from the restriction. Then, the liquid in the internal part of the detection tube can flow normally. During the circulation of the liquid in the detection tube, the liquid drives the second movable circle to move toward the retaining ring, compressing the second spring, so that the first movable circle is gathered on one side of the retaining ring. During this process, the second movable circle and the inner circle of the sealing ring fit together to form a seal, so that the liquid can only pass through the shunt pipe, thereby improving the efficiency of the gas flow box in processing gas. After the liquid circulates, it contacts the first movable circle at the other end of the shunt pipe, so that the first movable circle and the retaining ring form resistance to the liquid, allowing the flow meter to identify the internal flow of the detection tube, thereby improving the service life of the flow meter and the sensitivity of the sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0018] Figure 2 It is a schematic diagram of the overall internal structure of the present invention;

[0019] Figure 3 This is a schematic diagram of the internal structure of the detection tube of the present invention;

[0020] Figure 4 It is a schematic diagram of the internal structure of the flow distribution tube, the air flow box and the adsorption tube of the present invention;

[0021] Figure 5 For the present invention Figure 2 A schematic diagram of the enlarged structure at A in the middle;

[0022] Figure 6 It is a schematic diagram of the connection structure of the gear ring and the second movable ring of the present invention;

[0023] Figure 7 It is a schematic diagram of the structure of the solenoid valve and the seating block of the present invention;

[0024] Figure 8 It is a schematic diagram of the planar structure of the solenoid valve and the seating block of the present invention.

[0025] In the figure: 1- spiral separator; 2- connecting pipe; 3- detection pipe; 4- flow detection meter; 401- first differential pressure pipe; 402- second differential pressure pipe; 5- integrated shunt box; 6- air pressure detection meter; 601- first connecting pipeline; 7- shunt pipe; 8- air flow box; 801- first water permeable molecular membrane; 802- sealing plate; 9- adsorption tube; 901- flow ring; 902- magnetite; 10- current limiting plate; 11- sealing ring; 12-second water-permeable molecular membrane; 13-connecting hole; 14-installation tunnel; 15-baffle; 16-solenoid valve; 17-valve head; 18-limiting plate; 19-detection sensor; 20-second connecting pipeline; 21-first spring; 22-seating block; 2201-air outlet; 23-connecting plate; 24-docking hole; 25-stop ring; 26-second spring; 27-first movable circle; 28-fixed plate; 29-second movable circle. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] See also Figure 1-8The present invention provides a technical solution: a multiphase flow metering device based on an air pressure sensor, comprising a spiral separator 1, a connecting pipe 2 is fixedly installed at one end of the spiral separator 1, a detection tube 3 is fixedly connected to one end of the connecting pipe 2, a sealing ring 11 is fixedly installed inside the detection tube 3, a shunt tube 7 is fixedly installed outside the detection tube 3, the input end and the output end of the shunt tube 7 are respectively close to the two sides of the sealing ring 11, an air flow box 8 is fixedly connected to the shunt tube 7, an air outlet is opened on the top of the air flow box 8, a first water-permeable molecular membrane 801 is fixedly installed at one end of the air flow box 8, and a sealing ring 11 is fixedly installed at the other end of the air flow box 8. Plate 802, an adsorption tube 9 is fixedly connected to the bottom of the airflow box 8, a flow ring 901 is fixedly installed on one side of the adsorption tube 9, and a magnet 902 is rotatably connected inside the flow ring 901; a first pressure difference tube 401 is fixedly connected to one end of the top of the detection tube 3, and a second pressure difference tube 402 is fixedly connected to the other end of the detection tube 3, and a flow detection meter 4 is fixedly installed on the top of the first pressure difference tube 401 and the second pressure difference tube 402; the first water-permeable molecular membrane 801 is in an arc shape, and the inner circle of the first water-permeable molecular membrane 801 is connected to the input end of the detection tube 3, and the side of the adsorption tube 9 covers half of the top area of ​​the flow ring 901;After the pressure is generated inside the detection tube 3, the fluid inside the detection tube 3 is introduced into the airflow box 8 and the adsorption tube 9 through one end of the shunt tube 7, and then re-lead out to the inside of the detection tube 3 through the other end of the airflow box 8. First, one end of the spiral separator 1 is connected to the pump pipe to extract the crude oil in the oil well. Then, the other end of the spiral separator 1 is connected to the three-way valve to pre-separate the oil, gas and liquid. The three-way valve port is connected to the connecting tube 2, and then the connecting tube 2 and the detection tube 3 are connected. When the liquid passes through the inside of the detection tube 3, the shunt tube 7 performs a shunt operation on the inside of the detection tube 3, and part of the liquid enters the airflow box 8 through the input end of the shunt tube 7. When the liquid passes through the first water-permeable molecular membrane 801 inside the airflow box 8, the first water-permeable molecular membrane 801 separates the liquid and the carbon dioxide gas. The first water-permeable molecular membrane 801 is a polymer structure with certain strength and resistance. When the liquid passes through the first water-permeable molecular membrane 801, the liquid The water molecule membrane 801 produces a top-up phenomenon. As the internal pressure of the shunt tube 7 increases, the gas inside the liquid penetrates the first water-permeable molecule membrane 801. After the gas is separated, the liquid contacts the adsorption tube 9 along the bottom of the airflow box 8. Then, the liquid contacts the flow ring 901 inside the adsorption tube 9. After passing through the flow ring 901, the magnet 902 is driven to rotate. Since the sand and gravel contain metal materials, they have certain magnetism. The magnet 902 adsorbs the sand and gravel particles when rotating. Finally, the liquid passes through the other end of the airflow box 8 and flows out to the output end of the detection tube 3. At the same time, when the liquid flows inside the detection tube 3, the flow detection meter 4 detects the liquid flow. The first differential pressure tube 401 and the second differential pressure tube 402 can extend the sensor close to the inside of the detection tube 3. In this way, the influence of corrosive gas on the sensor probe is reduced, and the problem of excessive impurities in the crude oil interfering with the sensor device is prevented. ;

[0028] Furthermore, baffles 15 are fixedly installed at both ends of the inner circle of the detection tube 3, and a limiting plate 10 is fixedly connected between the two baffles 15. The limiting plate 10 divides the inside of the detection tube 3 into two areas, a gas part and a liquid part. A pair of connecting holes 13 are opened on the limiting plate 10, and the first pressure difference tube 401 and the second pressure difference tube 402 are fixedly connected to each connecting hole 13 respectively. An installation tunnel 14 is opened on the top of the detection tube 3, and an integrated diversion box 5 is detachably connected to the installation tunnel 14; the limiting plate A second water-permeable molecular membrane 12 is fixedly installed at one end of 10, a solenoid valve 16 is fixedly connected inside the integrated diverter box 5, a valve head 17 is fixedly connected to the bottom of the solenoid valve 16, a limit plate 18 is fixedly installed on one side of the valve head 17, the limit plate 18 and the sealing ring 11 are movably connected, a first connecting pipe 601 is fixedly installed on one side of the integrated diverter box 5, the second pressure difference pipe 402 and the first connecting pipe 601 are detachably connected together, and a detection sensor is fixedly installed on the other side of the integrated diverter box 5 Sensor 19, a flow channel through which gas can pass is formed around the detection sensor 19 and between the flow limiting plate 10, a second connecting pipe 20 is opened between the solenoid valve 16 and the detection sensor 19, and a pressure detection gauge 6 is fixedly connected to the top of the second connecting pipe 20, and the pressure detection gauge 6 and the flow detection gauge 4 are fixed together; a stop ring 25 is fixedly installed on one side of the sealing ring 11, and a second spring 26 is fixedly connected to one side of the stop ring 25, and a first movable ring 27 is fixedly connected to one end of the second spring 26, and a fixed plate 28 is fixedly installed on one side of the first movable ring 27, and a second movable ring 29 is fixedly connected to one side of the fixed plate 28. When the limit plate 18 descends, the other side of the first movable ring 27 is blocked, and when the valve head 17 is energized and the limit plate 18 and the first movable ring 27 separate the liquid from the liquid part of the detection tube 3, the second movable ring 29 and one end of the stop ring 25 are flush; the side of the detection sensor 19 facing the second water-permeable molecular membrane 12 is a heating section, and the side facing the docking hole 24 is a cooling section;In order to detect the content of crude oil liquid gas and confirm whether the crude oil can be directly extracted and utilized so as not to reduce the sensitivity of the sensor, the solenoid valve 16 can be powered off. When the solenoid valve 16 is powered off, the valve head 17 descends and drives the limit plate 18 to descend, so that the limit plate 18 contacts one side of the first movable circle 27. When the position of the first movable circle 27 is locked, the liquid inside the detection tube 3 cannot pass through the sealing ring 11. At the same time, the valve on the diversion pipe 7 is closed. After the liquid inside the detection tube 3 does not circulate and generates high pressure, the gas in the liquid inside the detection tube 3 is subjected to high pressure, and the volume of the liquid molecules inside the detection tube 3 becomes smaller, so that the gas passes through the second water-permeable molecular membrane 12, and the heating function on one side of the detection sensor 19 is turned on. The gas contacts the detection sensor 19 in the gas part inside the detection tube 3. The detection sensor 19 detects the content of the circulating gas through thermal induction, and the displayed value is located on the air pressure detection gauge 6. Then, through the second connecting pipe The liquid flows out of the pressure detection meter 6 through the channel 20. When the value displayed by the pressure detection meter 6 is low and below the normal threshold, the electromagnetic valve 16 can be energized, the valve on the shunt tube 7 is opened, the valve head 17 rises, and the first movable circle 27 is released. Then, the liquid in the liquid part of the detection tube 3 can flow normally. During the liquid circulation in the detection tube 3, the liquid drives the second movable circle 29 to move in the direction of the stop ring 25, so that the second spring 26 is compressed, so that the first movable circle 27 is gathered on one side of the stop ring 25. In this process, the second movable circle 29 and the inner circle of the sealing ring 11 are matched to form a seal, so that the liquid can only pass through the shunt tube 7, and the efficiency of the gas treatment of the gas flow box 8 is improved. After the liquid circulates, it contacts the first movable circle 27 at the other end of the shunt tube 7, so that the first movable circle 27 and the stop ring 25 form resistance to the liquid, so that the flow detection meter 4 can identify the internal flow of the detection tube 3, improve the service life of the flow detection meter 4, and improve the sensitivity of the sensor. ;

[0029] Furthermore, a first spring 21 is fixedly connected to the bottom of the second connecting pipe 20, a seating block 22 is fixedly connected to the bottom of the first spring 21, a pair of air outlet holes 2201 are provided on one side of the seating block 22, a docking hole 24 is provided inside the integrated shunt box 5, and the docking hole 24 is located between the seating block 22 and the detection sensor 19; a connecting plate 23 is fixedly connected to the other side of the valve head 17, one end of the connecting plate 23 is located at the top of the seating block 22, an air vent is provided on the top of the seating block 22, the gas in the detection tube 3 is connected to the air pressure detection gauge 6 through the air vent, and when the solenoid valve 16 is powered off and drives the valve head 17 to descend, the connecting plate 23 drives the seating block 22 to descend, and the sensor 19 is located at the bottom of the valve head 17. The air outlet 2201 and the docking hole 24 at the top of the seating block 22 are separated, and the air outlet 2201 located at the lowest point of the seating block 22 descends to the gas portion of the detection tube 3. As the detection sensor 19 generates high temperature over time, the sensitivity of the detection sensor 19 itself will be reduced. Therefore, when the detection sensor 19 is not in use, it is necessary to cool it quickly. When the valve head 17 rises, the connecting plate 23 and the seating block 22 are separated, the first spring 21 is reset, the air outlet 2201 and the docking hole 24 are docked, and the gas flowing out of the seating block 22 flows into the detection sensor 19 for contact, and the side of the detection sensor 19 is cooled and blown, thereby improving the sensitivity of the detection sensor 19.

[0030] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0031] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A multiphase flow metering device based on an air pressure sensor, comprising a spiral separator (1), one end of the spiral separator (1) being fixedly mounted with a connecting pipe (2), one end of the connecting pipe (2) being fixedly connected with a detection pipe (3), characterized in that: A sealing ring (11) is fixedly installed inside the detection tube (3), and a shunt tube (7) is fixedly installed outside the detection tube (3). The input end and the output end of the shunt tube (7) are respectively close to the two sides of the sealing ring (11). The shunt tube (7) is fixedly connected to an air flow box (8), and an air outlet hole is opened on the top of the air flow box (8). A first water-permeable molecular membrane (801) is fixedly installed at one end of the air flow box (8), and a sealing plate (802) is fixedly installed at the other end of the air flow box (8). An adsorption tube (9) is fixedly connected to the bottom of the air flow box (8), and a flow ring is fixedly installed on one side of the adsorption tube (9). (901), a magnet (902) is rotatably connected inside the flow ring (901); a first pressure differential tube (401) is fixedly connected to one end of the top of the detection tube (3), and a second pressure differential tube (402) is fixedly connected to the other end of the detection tube (3); a flow detection meter (4) is fixedly installed on the top of the first pressure differential tube (401) and the second pressure differential tube (402); when pressure is generated inside the detection tube (3), the fluid inside the detection tube (3) is introduced into the airflow box (8) and the adsorption tube (9) through one end of the shunt tube (7), and then re-lead out to the inside of the detection tube (3) through the other end of the airflow box (8).

2. A multiphase flow metering device based on an air pressure sensor according to claim 1, characterized in that: Baffles (15) are fixedly installed at both ends of the inner circle of the detection tube (3), and a limiting plate (10) is fixedly connected between the two baffles (15). The limiting plate (10) divides the interior of the detection tube (3) into two areas, a gas part and a liquid part. A pair of connecting holes (13) are provided on the limiting plate (10), and the first differential pressure tube (401) and the second differential pressure tube (402) are respectively fixedly connected to each connecting hole (13). An installation tunnel (14) is provided on the top of the detection tube (3), and an integrated flow dividing box (5) is detachably connected to the installation tunnel (14).

3. A multiphase flow metering device based on an air pressure sensor according to claim 2, characterized in that: A second water-permeable molecular membrane (12) is fixedly installed at one end of the flow-limiting plate (10); a solenoid valve (16) is fixedly connected inside the integrated flow-dividing box (5); a valve head (17) is fixedly connected to the bottom of the solenoid valve (16); a limit plate (18) is fixedly installed on one side of the valve head (17); the limit plate (18) and the sealing ring (11) are movably connected; a first connecting pipe (601) is fixedly installed on one side of the integrated flow-dividing box (5); the second pressure difference pipe (402) and the first connecting pipe (601) are fixedly installed on one side of the integrated flow-dividing box (5); The connecting pipes (601) are detachably connected together, a detection sensor (19) is fixedly installed on the other side of the integrated flow dividing box (5), a flow channel through which gas can pass is formed around the detection sensor (19) and between the flow limiting plate (10), a second connecting pipe (20) is opened between the solenoid valve (16) and the detection sensor (19), an air pressure detection meter (6) is fixedly connected to the top of the second connecting pipe (20), and the air pressure detection meter (6) and the flow detection meter (4) are fixed together.

4. A multiphase flow metering device based on an air pressure sensor according to claim 3, characterized in that: The bottom of the second connecting pipe (20) is fixedly connected to a first spring (21), the bottom of the first spring (21) is fixedly connected to a seating block (22), one side of the seating block (22) is provided with a pair of air outlet holes (2201), the inside of the integrated diverter box (5) is provided with a docking hole (24), and the docking hole (24) is located between the seating block (22) and the detection sensor (19).

5. The multiphase flow metering device based on air pressure sensor according to claim 3 is characterized in that: The other side of the valve head (17) is fixedly connected to a connecting plate (23), one end of the connecting plate (23) is located at the top of the seating block (22), and an air vent is provided at the top of the seating block (22). The gas portion in the detection tube (3) is connected to the air pressure detection gauge (6) through the air vent. When the solenoid valve (16) is powered off and drives the valve head (17) to descend, the connecting plate (23) drives the seating block (22) to descend, and the air outlet (2201) and the docking hole (24) at the top of the seating block (22) are separated, and the air outlet (2201) at the lowest point of the seating block (22) descends to the inside of the gas portion in the detection tube (3).

6. The multiphase flow metering device based on air pressure sensor according to claim 5, characterized in that: The side of the detection sensor (19) facing the second water-permeable molecular membrane (12) is a heating section, and the side facing the docking hole (24) is a cooling section.

7. The multiphase flow metering device based on air pressure sensor according to claim 3 is characterized in that: A retaining ring (25) is fixedly mounted on one side of the sealing ring (11), a second spring (26) is fixedly connected to one side of the retaining ring (25), one end of the second spring (26) is fixedly connected to a first movable ring (27), a fixed plate (28) is fixedly mounted on one side of the first movable ring (27), and a second movable ring (29) is fixedly connected to one side of the fixed plate (28). When the limit plate (18) descends, the other side of the first movable ring (27) is blocked. When the valve head (17) is energized to rise and the limit plate (18) and the first movable ring (27) separate the liquid passing through the liquid portion of the detection tube (3), the second movable ring (29) is flush with one end of the retaining ring (25).

8. The multiphase flow metering device based on air pressure sensor according to claim 7, characterized in that: One end of the flow diverter pipe (7) is located between the sealing ring (11) and the retaining ring (25), and the area of ​​the sealing ring (11) is twice that of the retaining ring (25).

9. The multiphase flow metering device based on air pressure sensor according to claim 1, characterized in that: The first water-permeable molecular membrane (801) is arc-shaped, and the inner circle of the first water-permeable molecular membrane (801) is connected to the input end of the detection tube (3), and the side surface of the adsorption tube (9) covers half of the top area of ​​the flow ring (901).

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