A gas-liquid mixed multiphase flowmeter

Abstract

The present invention discloses a multiphase flowmeter for mixed gas and liquid, and relates to the field of flow measurement technology. The present invention includes a measuring chamber, a conductive electrode plate, a permanent magnet and a detection assembly. By arranging multiple measuring temperature plates and a reference temperature measuring plate in the measuring chamber, controlling the temperature with a heating wire, and combining the design of a temperature conducting block and a heat receiving block, accurate measurement of the fluid flow rate is achieved. The device converts temperature changes into resistance changes through mechanical displacement transmission, thereby obtaining the flow rate information of the fluid. By utilizing the combination of the conductive electrode plate and the permanent magnet, electromagnetic induction is used to measure the potential difference generated by the conductive liquid in the magnetic field to determine the volume ratio of gas and liquid in the fluid.

Description

Technical Field

[0001] The present invention relates to the technical field of flow measurement, in particular to a gas-liquid mixed transmission multiphase flowmeter. Background Art

[0002] Gas-liquid two-phase flows are common in industrial production, energy extraction, and chemical processes. Accurately measuring the flow rates of both the liquid and gas is crucial for process optimization and safe operation. However, existing flowmeters, such as turbine flowmeters, ultrasonic flowmeters, and Coriolis mass flowmeters, are primarily designed for single-phase flows and struggle to accurately measure both liquid and gas flow rates simultaneously in mixed gas-liquid flows.

[0003] Ultrasonic flowmeters utilize the propagation characteristics of sound waves in fluids for measurement. However, the interface between gas and liquid phases reflects and scatters sound waves, causing signal attenuation and distortion, making the measurement unreliable. Coriolis mass flowmeters can measure mass flow, but in the presence of gas and liquid, density inhomogeneities and interference from bubbles cause complex variations in the vibration signal, making it difficult to separate the flow rates of liquid and gas. Existing technologies typically only measure total flow and cannot distinguish the ratio of liquid to gas flow. Summary of the Invention

[0004] In order to overcome the defects of the above-mentioned prior art, the present invention provides the following technical solutions: a gas-liquid mixed multiphase flowmeter, comprising a measuring chamber, two symmetrically arranged conductive plates are provided on the inner wall of the measuring chamber, two symmetrically arranged permanent magnets are provided on both sides between the two conductive plates, and the relative positions of the permanent magnets and the conductive plates can be freely adjusted; a detection component is also provided in the measuring chamber, the detection component includes a measuring temperature plate and a reference temperature measuring plate, wherein there are multiple measuring temperature plates, and all of the measuring temperature plates and the reference temperature measuring plates are parallel to the flow direction of the fluid, wherein all of the measuring temperature plates are arranged in an equidistant array perpendicular to the flow direction of the fluid, and one end of all the measuring temperature plates is fixed on a temperature conductive block, and the temperature conductive block is embedded in the inner wall of the measuring chamber.

[0005] Preferably, a heat receiving block is fixedly provided on the temperature conducting block, the heat receiving block is located outside the measuring chamber, the connection between the temperature conducting block and the measuring chamber is fixed and embedded in a sealed manner, a measuring piston tube is fixed in the middle of the surface of the heat receiving block, and an embedded heat receiving piston tube is opened in the middle of the interior of the heat receiving block, which is coaxial with and connected to the measuring piston tube.

[0006] Preferably, the sliding piston embedded in the heated piston tube is equipped with a measuring piston, and a measuring support moving rod is fixed on the measuring piston; the reference temperature measuring plate is fixed on the reference temperature conducting piston tube, and the reference temperature conducting piston tube is embedded on the inner wall of the measuring chamber, and the interior of the reference temperature conducting piston tube is connected to the interior of the reference temperature measuring plate, wherein the connection between the reference temperature conducting piston tube and the measuring chamber is fixed in a sealed manner.

[0007] Preferably, the sliding piston in the reference temperature conducting piston tube is equipped with a reference piston, a vertical resistance sliding rod is fixed on the reference piston, the vertical resistance sliding rod and the measurement support moving rod are both slidably mounted on a sliding frame, and the sliding frame is fixed on the measuring chamber.

[0008] Preferably, a horizontal conductive pointer is fixed to the end of the measuring support moving rod away from the measuring piston, and the horizontal conductive pointer is conductively slidably matched with the vertical resistance sliding rod. A gearbox is also fixed on the sliding frame, and a passive gear is fixed to the input end of the gearbox. A passive rack meshing with the passive gear is fixed to the side of the vertical resistance sliding rod.

[0009] Preferably, an arc-shaped resistor bar support plate is fixed on the sliding frame through an arc-shaped resistor bar support plate bracket, and two concentrically arranged outer arc-shaped resistor bars and inner arc-shaped resistor bars are fixed on the arc-shaped resistor bar support plate. The outer arc-shaped resistor bar and the inner arc-shaped resistor bar have different resistivities, and a conductive rotating pointer is fixed on the output end of the gearbox, which is conductively slidingly matched with the outer arc-shaped resistor bar and the inner arc-shaped resistor bar.

[0010] Preferably, a protective shell is provided on the outer side of the measuring chamber, and end face protection plates are fixed at both ends of the protective shell. An extension tube body is fixed to one end of the measuring chamber, and the extension tube body is fixedly matched with the end face protection plate. The other end of the measuring chamber is fixedly matched with the end face protection plate. Flanges are fixed on both the measuring chamber and the extension tube body for serial connection in the pipeline to be measured.

[0011] Preferably, an adjusting screw bracket is fixed on the outer surface of the measuring chamber, a guide slide is fixed on the adjusting screw bracket, an adjusting screw arranged parallel to the guide slide is rotatably mounted on the adjusting screw bracket, wherein there are two guide slides and two adjusting screws, and the two guide slides and two adjusting screws are symmetrically arranged on both sides of the outer surface of the measuring chamber; a permanent magnet bracket is slidably mounted on the guide slide, the permanent magnet bracket is threadedly coupled with the adjusting screw, and two permanent magnets are fixed on the permanent magnet bracket.

[0012] Preferably, a synchronous gear is fixed at one end of the two adjusting screws, and the two synchronous gears are synchronously transmitted through a synchronous gear ring that rotates with the measuring chamber or the extension tube body. A drive motor is fixed on the outer surface of the extension tube body, and the output shaft of the drive motor is fixedly matched with one of the synchronous gears.

[0013] Preferably, the other ends of the reference temperature measuring plate and all the measuring temperature plates are fixed on the aerogel sheet, so that the reference temperature measuring plate and all the measuring temperature plates are thermally insulated from the inner wall of the measuring chamber by the aerogel sheet; aerogel sheets are provided at the contact positions of the temperature conducting block and the reference temperature conducting piston tube with the measuring chamber; and the surface of the aerogel sheet in contact with the fluid to be measured is provided with an anti-corrosion coating.

[0014] Compared with the prior art, the present invention has the following advantages: (1) The present invention realizes a multi-dimensional measurement method, avoiding the limitations of the traditional single measurement method. In the gas-liquid mixed flow, the presence of bubbles and the inhomogeneity of the fluid are no longer the main factors affecting the accuracy. By accurately detecting the potential difference, resistance change and flow rate, the liquid and gas flow information can be obtained more stably, significantly improving the accuracy and reliability of the measurement; (2) The present invention ensures that the resistance value measured at the same position is the same by designing the outer and inner arc-shaped resistor strips and making them have different resistivities, thereby reducing the measurement error caused by the failure of a single resistor strip. At the same time, the application of aerogel sheets effectively insulates heat, prevents the external environment from interfering with the measurement results, and improves the stability of the device; (3) The present invention realizes the simultaneous measurement of liquid and gas flow in gas-liquid two-phase fluids. Unlike traditional flow meters that can only measure the total flow, the present invention can accurately distinguish the volume ratio of liquid and gas, providing more accurate flow data. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0016] Figure 2 It is a structural schematic diagram of the conductive electrode plate of the present invention.

[0017] Figure 3 For the present invention Figure 2 Schematic diagram of the structure at point A in the middle.

[0018] Figure 4 This is a structural schematic diagram of the reference temperature measuring plate of the present invention.

[0019] Figure 5 For the present invention Figure 4 Schematic diagram of the structure at point B in the middle.

[0020] In the figure: 101 - measuring chamber; 102 - adjusting screw support; 103 - guide slide; 104 - adjusting screw; 105 - permanent magnet support; 106 - driving motor; 107 - synchronous gear; 108 - synchronous gear ring; 109 - extension tube; 110 - flange; 111 - protective housing; 112 - end face protection plate; 113 - permanent magnet; 114 - conductive electrode plate; 115 - sliding frame; 116 - arc-shaped resistor bar support plate; 117 - outer arc-shaped resistor bar; 118 - inner arc-shaped resistor bar; 119 -conductive rotating pointer; 120-gearbox; 121-passive gear; 122-passive rack; 123-vertical resistance slide; 124-horizontal conductive pointer; 125-reference piston; 126-reference temperature-conducting piston tube; 127-reference temperature measuring plate; 128-measuring temperature sheet; 129-aerogel sheet; 130-temperature-conducting block; 131-heating block; 132-embedded heated piston tube; 133-measuring piston; 134-measuring support moving rod; 135-measuring piston tube; 136-arc-shaped resistance strip support disk bracket. DETAILED DESCRIPTION

[0021] The following is combined with Figure 1-5 , and further illustrate the technical solution of the present invention through specific implementation methods.

[0022] The present invention provides a gas-liquid mixed multiphase flowmeter, including a measuring chamber 101, wherein two symmetrically arranged conductive plates 114 are provided on the inner wall of the measuring chamber 101, and two symmetrically arranged permanent magnets 113 are provided on both sides between the two conductive plates 114, and the relative positions of the permanent magnets 113 and the conductive plates 114 can be freely adjusted; a detection component is also provided in the measuring chamber 101, and the detection component includes a measuring temperature plate 128 and a reference temperature measuring plate 127, wherein there are multiple measuring temperature plates 128, and all of the measuring temperature plates 128 and the reference temperature measuring plates 127 are parallel to the flow direction of the fluid, wherein all of the measuring temperature plates 128 are arranged in an equidistant array perpendicular to the flow direction of the fluid, and one end of all of the measuring temperature plates 128 is fixed on a temperature conducting block 130, and the temperature conducting block 130 is embedded in the inner wall of the measuring chamber 101. A heated block 131 is fixedly mounted on the thermal block 130. The heated block 131 is located outside the measurement chamber 101. The connection between the thermal block 130 and the measurement chamber 101 is fixedly embedded in a sealed manner. A measuring piston tube 135 is fixed in the middle of the surface of the heated block 131. An embedded heated piston tube 132 is provided in the middle of the interior of the heated block 131, coaxially with and connected to the measuring piston tube 135. A measuring piston 133 is provided as a sliding piston within the embedded heated piston tube 132. A measuring support movable rod 134 is fixed to the measuring piston 133. A reference temperature measuring plate 127 is fixed to a reference temperature conducting piston tube 126, which is embedded in the inner wall of the measurement chamber 101. The interior of the reference temperature conducting piston tube 126 is connected to the interior of the reference temperature measuring plate 127. The connection between the reference temperature conducting piston tube 126 and the measurement chamber 101 is fixed in a sealed manner. The sliding piston in the reference temperature conducting piston tube 126 is equipped with a reference piston 125, on which a vertical resistance sliding rod 123 is fixed. The vertical resistance sliding rod 123 and the measurement support moving rod 134 are both slidably mounted on the sliding frame 115, and the sliding frame 115 is fixed on the measuring chamber 101.

[0023] A horizontal conductive pointer 124 is fixed to the end of the measuring support movable rod 134 away from the measuring piston 133. This pointer 124 engages with the vertical resistance slide 123 in an electrically conductive and sliding manner. A gearbox 120 is also fixed to the sliding frame 115. A passive gear 121 is fixed to the input end of the gearbox 120. A passive rack 122, which meshes with the passive gear 121, is fixed to the side of the vertical resistance slide 123. An arcuate resistor bar support plate 116 is fixed to the sliding frame 115 via an arcuate resistor bar support plate bracket 136. Two concentrically arranged outer and inner arcuate resistor bars 117, 118 are fixed to the arcuate resistor bar support plate 116. These outer and inner arcuate resistor bars 117, 118 have different resistivities. A conductive rotating pointer 119 is fixed to the output end of the gearbox 120 in an electrically conductive and sliding manner with the outer and inner arcuate resistor bars 117, 118.

[0024] The outer side of the measuring chamber 101 is provided with a protective shell 111, and end face protection plates 112 are fixed at both ends of the protective shell 111. An extension tube body 109 is fixed to one end of the measuring chamber 101, and the extension tube body 109 is fixedly matched with the end face protection plate 112. The other end of the measuring chamber 101 is fixedly matched with the end face protection plate 112. Flanges 110 are fixed on the measuring chamber 101 and the extension tube body 109 for serial connection in the pipeline to be measured. An adjusting screw bracket 102 is fixed on the outer surface of the measuring chamber 101, and a guide slide 103 is fixed on the adjusting screw bracket 102. An adjusting screw 104 arranged parallel to the guide slide 103 is rotatably mounted on the adjusting screw bracket 102, wherein there are two guide slides 103 and two adjusting screws 104, and the two guide slides 103 and the two adjusting screws 104 are symmetrically arranged on both sides of the outer surface of the measuring chamber 101; a permanent magnet bracket 105 is slidably mounted on the guide slide 103, and the permanent magnet bracket 105 is threadedly engaged with the adjusting screw 104, and two permanent magnets 113 are fixed on the permanent magnet bracket 105. A synchronous gear 107 is fixed at one end of each adjusting screw rod 104, and the two synchronous gears 107 are synchronously transmitted through a synchronous gear ring 108 that rotates with the measuring chamber 101 or the extension tube body 109. A drive motor 106 is fixed on the outer surface of the extension tube body 109, and the output shaft of the drive motor 106 is fixedly matched with one of the synchronous gears 107.

[0025] The other ends of the reference temperature measuring plate 127 and all the measuring temperature plates 128 are fixed on the aerogel sheet 129, so that the reference temperature measuring plate 127 and all the measuring temperature plates 128 are thermally insulated from the inner wall of the measuring chamber 101 by the aerogel sheet 129; aerogel sheets 129 are set at the contact positions of the temperature conducting block 130 and the reference temperature conducting piston tube 126 with the measuring chamber 101; the surface of the aerogel sheet 129 in contact with the fluid to be measured is provided with an anti-corrosion coating.

[0026] The working principle of a gas-liquid mixed multiphase flowmeter disclosed in the present invention is as follows: the device as a whole is installed in series in the pipeline to be measured through two flanges 110. When the fluid passes through the inside of the measuring chamber 101, it will pass through the measuring temperature plate 128 and the reference temperature measuring plate 127. The density of the liquid inside the reference temperature measuring plate 127 will change with the temperature of the fluid (liquid is provided in the reference temperature measuring plate 127 and the reference temperature conducting piston tube 126), thereby causing the pressure inside the reference temperature conducting piston tube 126 and the reference temperature measuring plate 127 to change. Since the temperature of the fluid usually does not change much, the pressure inside the reference temperature conducting piston tube 126 remains basically unchanged. As time goes by, the pressure inside the reference temperature conducting piston tube 126 will stabilize to a certain value. At this time, the reference piston 125 will not slide in the reference temperature conducting piston tube 126, and will stay at a certain position. Since the vertical resistance slide rod 123 is fixed on the reference piston 125, the position of the vertical resistance slide rod 123 is also fixed (at the same time, the movement of the vertical resistance slide rod 123 will drive the The movable rack 122 moves, and the driven rack 122 drives the driven gear 121 to rotate. The driven gear 121 drives the input shaft of the gearbox 120 to rotate, and the output shaft of the gearbox 120 drives the conductive rotary pointer 119 to rotate, thereby changing the relative position of the conductive rotary pointer 119 on the outer arc-shaped resistor bar 117 and the inner arc-shaped resistor bar 118 (the different resistivities of the outer arc-shaped resistor bar 117 and the inner arc-shaped resistor bar 118 are set to ensure that when the conductive rotary pointer 119 is in the same position, the resistance values ​​measured between the outer arc-shaped resistor bar 117 and the inner arc-shaped resistor bar 118 and the conductive rotary pointer 119 are the same. The purpose of setting the outer arc-shaped resistor bar 117 and the inner arc-shaped resistor bar 118 is to reduce the failure rate). Different positions result in different resistances. Therefore, by detecting the resistance values ​​between the outer arc-shaped resistor bar 117 and the inner arc-shaped resistor bar 118 and the conductive rotary pointer 119, the pressure inside the reference temperature measuring plate 127 can be determined, thereby determining the temperature of the fluid inside the measuring chamber 101). Then the heating wire is started (the heating wire is set in the measuring temperature plate 128), and the temperature of the heated block 131 is increased through the temperature conducting block 130, and at the same time the density of the liquid embedded in the heated piston tube 132 is increased (liquid is also set in the embedded heated piston tube 132). At this time, the pressure inside the embedded heated piston tube 132 increases, pushing the measuring piston 133 to slide in the measuring piston tube 135 and the embedded heated piston tube 132, and then driving the measuring support moving rod 134 fixed to the measuring piston 133 to move synchronously, and the horizontal conductive pointer 124 on the measuring support moving rod 134 will follow the movement. Since the horizontal conductive pointer 124 slides with the vertical resistance sliding rod 123, the relative position of the horizontal conductive pointer 124 on the vertical resistance sliding rod 123 is changed (such as Figure 5In the example, the user initially slides upward on vertical resistance slider 123. A horizontal conductive pointer 124 and one end of vertical resistance slider 123 are connected in series in a DC circuit. By detecting the current in the circuit (with the voltage remaining constant), the resistance of the loop formed by horizontal conductive pointer 124 and vertical resistance slider 123 can be determined. As fluid flows within measurement chamber 101 (the fluid temperature is lower than the heat generated by heat block 131, for example, at 20°C and 50°C), the flowing fluid absorbs heat from measurement temperature plate 128. Under the premise of ensuring that the heating power of the heating wire in the measuring temperature piece 128 remains unchanged, the faster the flow rate of the fluid in the measuring chamber 101, the more heat can be taken away from the measuring temperature piece 128. Due to the temperature transfer, the temperature on the heat conducting block 130 and the heat receiving block 131 will decrease, thereby causing the pressure of the liquid inside the embedded heated piston tube 132 to decrease, causing the measuring piston 133 to slide in the opposite direction in the embedded heated piston tube 132, and the relative position of the synchronous horizontal conductive pointer 124 on the vertical resistance slide rod 123 to change again (such as Figure 5 , moves downward), at which point the current in the circuit formed by the horizontal conductive pointer 124 and the vertical resistance slider 123 will change. The faster the flow rate of the fluid inside all measuring chambers 101, the lower the pressure of the liquid embedded in the heated piston tube 132, resulting in a greater displacement of the horizontal conductive pointer 124 on the vertical resistance slider 123 (greater displacement of the measuring piston 133 and the measuring support movable rod 134). This, in turn, causes a greater change in the current in the circuit formed by the vertical resistance slider 123 and the horizontal conductive pointer 124. By detecting the magnitude of this current, the flow rate of the fluid inside the measuring chamber 101 can be determined. Since the cross-sectional area of ​​the measuring chamber 101 is known, the flow rate of the fluid inside the measuring chamber 101 can be derived. When the fluid passes between the two conductive plates 114 (the fluid may contain gas, so the proportion of gas and liquid must be calculated), a DC voltage is applied between the two conductive plates 114 and the current in the circuit is measured to determine the resistance of the fluid between the two conductive plates 114. Because the presence of gas in the fluid (gas is non-conductive, so the measured liquid must be conductive), the volume of the liquid between the two conductive plates 114 decreases, which means the cross-sectional area of ​​the fluid decreases (under the influence of gravity, the gas will be located on the top of the inner wall of the measurement chamber 101). Therefore, the larger the volume of the liquid, the lower the resistance in the DC circuit, the greater the current in the circuit, and the smaller the reverse current (the remaining current is the volume of the gas). Combined with the previously measured fluid flow rate, the volume of gas and liquid in the fluid passing between the two conductive plates 114 per unit time can be determined.

[0027] Voltage sensors are set on the two conductive plates 114 to detect the potential difference between the two conductive plates 114. When the liquid passes through the magnetic field between the two permanent magnets 113, it will cut the magnetic lines of force of the permanent magnets 113, thereby generating a potential difference at both ends of the liquid, that is, a potential difference is generated on the two conductive plates 114. The faster the flow rate of the fluid, the greater the potential difference. The flow rate of the liquid can be known by the size of the potential difference and the cross-sectional area inside the measuring chamber 101. This is based on the assumption that there is no gas inside the measuring chamber 101. When there is gas, it means that the liquid is not completely in contact with the two conductive plates 114, which will increase the resistance of the liquid between the two conductive plates 114. Under the same flow rate, the potential difference across the two conductive plates 114 will decrease (equivalent to the internal resistance). Combined with the previously measured flow rate as a benchmark (because when the measuring chamber 101 is full of liquid, the potential difference between the two conductive plates 114 can be known, and the flow rate is known, so it is used as a benchmark. If the potential difference is low, there must be gas), the volume of liquid and gas in the fluid flowing between the two conductive plates 114 per unit time can be obtained. By controlling the rotation of the output shaft of the drive motor 106, the output shaft of the drive motor 106 drives the synchronous gear 107 to rotate, and the two synchronous gears 107 rotate synchronously through the synchronous gear ring 108. The synchronous gear 107 drives the adjusting screw 104 to rotate, and the adjusting screw 104 drives the permanent magnet bracket 105 to slide on the guide slide 103. The permanent magnet bracket 105 drives the permanent magnet 113 to move, that is, the magnetic lines of force of the magnetic field move. When the fluid is stationary, since the fluid cannot move, the volume of the liquid between the two conductive plates 114 (the potential difference between the two conductive plates 114) can be measured by moving the magnetic field. It can be used for calibration when not working.

Claims

1. A gas-liquid mixed multiphase flowmeter, characterized by: The measuring chamber (101) comprises two symmetrically arranged conductive plates (114) provided on the inner wall of the measuring chamber (101), two symmetrically arranged permanent magnets (113) provided on both sides between the two conductive plates (114), and the relative positions of the permanent magnets (113) and the conductive plates (114) can be freely adjusted; A detection assembly is also provided in the measuring chamber (101), and the detection assembly includes a measuring temperature piece (128) and a reference temperature measuring plate (127), wherein the measuring temperature pieces (128) are multiple, and all the measuring temperature pieces (128) and the reference temperature measuring plate (127) are parallel to the flow direction of the fluid, wherein all the measuring temperature pieces (128) are arranged in an equidistant array perpendicular to the flow direction of the fluid, and one end of all the measuring temperature pieces (128) is fixed on a temperature conducting block (130), and the temperature conducting block (130) is embedded in the inner wall of the measuring chamber (101); A heat receiving block (131) is fixedly provided, and the heat receiving block (131) is located outside the measuring chamber (101). The connection between the temperature conducting block (130) and the measuring chamber (101) is fixedly embedded in a sealed manner. A measuring piston tube (135) is fixed in the middle of the surface of the heat receiving block (131). An embedded heat receiving piston tube (132) is provided in the middle of the interior of the heat receiving block (131) and is coaxial with and communicates with the measuring piston tube (135). A measuring piston (133) is provided as a sliding piston embedded in the heat receiving piston tube (132). A measuring support moving rod (134) is fixed on the measuring piston (133). The reference temperature measuring plate (127) is fixed on the reference temperature conducting piston tube (126), the reference temperature conducting piston tube (126) is embedded in the inner wall of the measuring chamber (101), the interior of the reference temperature conducting piston tube (126) is connected to the interior of the reference temperature measuring plate (127), wherein the connection between the reference temperature conducting piston tube (126) and the measuring chamber (101) is fixed in a sealed manner; the sliding piston in the reference temperature conducting piston tube (126) is equipped with a reference piston (125), a vertical resistance sliding rod (123) is fixed on the reference piston (125), the vertical resistance sliding rod (123) and the measuring support moving rod (134) are both slidably mounted on the sliding frame (115), and the sliding frame (115) is fixed on the measuring chamber (101).

2. A gas-liquid mixed multiphase flowmeter according to claim 1, characterized in that: A horizontal conductive pointer (124) is fixed to one end of the measuring support moving rod (134) away from the measuring piston (133), and the horizontal conductive pointer (124) and the vertical resistance sliding rod (123) are conductively slidably matched. A gearbox (120) is also fixed on the sliding frame (115), and a passive gear (121) is fixed to the input end of the gearbox (120). A passive rack (122) meshing with the passive gear (121) is fixed to the side of the vertical resistance sliding rod (123).

3. A gas-liquid mixed multiphase flowmeter according to claim 2, characterized in that: An arc-shaped resistor bar support disk (116) is fixed to the sliding frame (115) via an arc-shaped resistor bar support disk bracket (136). Two concentrically arranged outer arc-shaped resistor bars (117) and an inner arc-shaped resistor bar (118) are fixed to the arc-shaped resistor bar support disk (116). The outer arc-shaped resistor bar (117) and the inner arc-shaped resistor bar (118) have different resistivities. A conductive rotating pointer (119) is fixed to the output end of the gearbox (120) and is conductively slidably matched with the outer arc-shaped resistor bar (117) and the inner arc-shaped resistor bar (118).

4. A gas-liquid mixed multiphase flowmeter according to claim 3, characterized in that: The outer side of the measuring chamber (101) is provided with a protective shell (111), and end face protective plates (112) are fixed to both ends of the protective shell (111). An extension tube (109) is fixed to one end of the measuring chamber (101), and the extension tube (109) is fixedly matched with the end face protective plate (112). The other end of the measuring chamber (101) is fixedly matched with the end face protective plate (112). Flanges (110) are fixed on both the measuring chamber (101) and the extension tube (109) for serial connection in the pipeline to be measured.

5. The gas-liquid mixed multiphase flowmeter according to claim 4, characterized in that: An adjusting screw support (102) is fixed on the outer surface of the measuring chamber (101), a guide slide (103) is fixed on the adjusting screw support (102), and an adjusting screw (104) arranged parallel to the guide slide (103) is rotatably mounted on the adjusting screw support (102), wherein the guide slides (103) and the adjusting screw (104) are two each, and the two guide slides (103) and the two adjusting screws (104) are symmetrically arranged on both sides of the outer surface of the measuring chamber (101); a permanent magnet support (105) is slidably mounted on the guide slide (103), the permanent magnet support (105) and the adjusting screw (104) are threadedly coupled, and two permanent magnets (113) are fixed on the permanent magnet support (105).

6. The gas-liquid mixed multiphase flowmeter according to claim 5, characterized in that: A synchronous gear (107) is fixed to one end of each of the two adjusting screw rods (104), and the two synchronous gears (107) are meshed with a synchronous gear ring (108) that is rotatably matched with the measuring chamber (101) or the extension tube body (109) to synchronize transmission. A driving motor (106) is fixed on the outer surface of the extension tube body (109), and the output shaft of the driving motor (106) is fixedly matched with one of the synchronous gears (107).

7. The gas-liquid mixed multiphase flowmeter according to claim 6, characterized in that: The other ends of the reference temperature measuring plate (127) and all the measuring temperature plates (128) are fixed on the aerogel plate (129), so that the reference temperature measuring plate (127) and all the measuring temperature plates (128) are thermally insulated from the inner wall of the measuring chamber (101) through the aerogel plate (129); the aerogel plate (129) is provided at the contact positions between the temperature conducting block (130) and the reference temperature conducting piston tube (126) and the measuring chamber (101); wherein the surface of the aerogel plate (129) in contact with the fluid to be measured is provided with an anti-corrosion coating.

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