Gas-liquid two-phase flowmeter

Abstract

The invention belongs to the technical field of gas-liquid two-phase fluid metering, and particularly relates to a gas-liquid two-phase flowmeter which comprises a metering pipe, an auxiliary pipeline and a valve part used for controlling opening and closing of the auxiliary pipeline and a main pipeline. The bracket is fixedly connected to the outer side of the main pipeline; the rotating shaft is rotationally arranged on the bracket; the pore plate assemblies are arranged on the rotating shaft; by arranging the metering pipe and the auxiliary pipeline, when the pore plate assembly needs to be replaced due to the problems of abrasion, leakage and the like, the main pipeline is closed, the auxiliary pipeline is opened, fluid flows normally through the auxiliary pipeline, and the rotating shaft is rotated, so that the positions of the new pore plate assembly and the old pore plate assembly are changed, and the replacement work of the pore plate assembly can be rapidly completed without shutdown; compared with a method for replacing the pore plate assembly after shutdown in the prior art, the working efficiency is improved. In the process of replacing the pore plate assembly, the main pipeline is in a temporary closed state, fluid does not enter the main pipeline any more, and replacement work of the pore plate assembly is facilitated.

Description

Technical Field

[0001] This invention belongs to the field of gas-liquid two-phase fluid metering, specifically a gas-liquid two-phase flow meter. Background Technology

[0002] In systems such as petroleum refining and wastewater treatment, gas-liquid two-phase flow meters are frequently used to measure the amount of gas and liquid in a fluid. A gas-liquid two-phase flow meter is an instrument used to measure the simultaneous presence of gas and liquid in a fluid. It utilizes the different characteristics generated by the gas and liquid phases during the flow process to achieve accurate measurement of the gas-liquid two-phase flow rate.

[0003] A patent application with publication number CN209745461U discloses an integrated dual differential pressure tapping eccentric orifice plate gas-liquid two-phase flow measurement device, including an integrated dual differential pressure transmitter and an eccentric orifice plate. The eccentric orifice plate is located inside the measuring pipe. The gas and liquid are throttled by the circular through-hole on the eccentric orifice plate. Pressure is taken through the first pressure tapping point, the second pressure tapping point and the third pressure tapping point respectively to realize the measurement of two different differential pressure values. Based on these two different differential pressure values, the relevant flow parameters of the gas phase and liquid phase in the gas-liquid two-phase flow are calculated.

[0004] The above technical solution still has some problems in practical application. The orifice plate used in the instrument plays a throttling role. During the operation, the orifice plate is always in contact with the flowing fluid. The fluid impacts the orifice plate. After long-term operation, the orifice plate will have problems such as wear and leakage, and needs to be replaced. However, when replacing the orifice plate, it is necessary to shut down the fluid system related to the orifice plate to prevent fluid leakage and other dangerous accidents. This leads to the need to stop the machine for replacement, which directly affects the metering work and results in low work efficiency.

[0005] Therefore, the present invention provides a gas-liquid two-phase flow meter. Summary of the Invention

[0006] In order to overcome the shortcomings of the prior art, at least one technical problem raised in the background art is solved.

[0007] The technical solution adopted by the present invention to solve its technical problem is as follows: The present invention provides a gas-liquid two-phase flow meter, including a metering tube, the metering tube including a main pipe, the two ends of the main pipe being respectively provided with an inlet pipe and an outlet pipe, the main pipe being provided with a detection unit and a pressure transmitter, the detection unit including a temperature detection unit, a pressure detection unit and a flow rate detection unit, and further including: a secondary pipe, the two ends of the secondary pipe being respectively connected to the inlet pipe and the outlet pipe; a valve for controlling the opening and closing of the secondary pipe and the main pipe; a bracket fixed to the outside of the main pipe; a rotating shaft rotatably provided on the bracket; and a plurality of orifice plate assemblies provided on the rotating shaft, one of the orifice plate assemblies being located inside the main pipe, the main pipe having a notch for the orifice plate assembly to move.

[0008] Preferably, the bracket includes two parts located on the upper and lower sides of the notch, and the bracket has space for the perforated plate assembly to rotate.

[0009] Preferably, it further includes a sealing part, which includes a sealing ring that is slidably sleeved on the outside of the main pipe, and the sealing ring covers the outside of the notch after it moves down.

[0010] Preferably, the sealing part further includes: a sealing gasket disposed on the inner sidewall of the sealing ring; two fastening plates slidably disposed inside the sealing ring; a rotating ring disposed rotatably inside the sealing ring; and a wedge fixed to the rotating ring, the end of the wedge having a bevel, and the fastening plate having a through groove corresponding to the wedge. After the rotating ring rotates, it drives the fastening plate to move through the wedge.

[0011] Preferably, it further includes a control unit, the control unit comprising: a toothed segment fixed to the rotating ring; a turntable rotatably disposed on the bracket, the turntable being meshed with the toothed segment; a slide seat slidably disposed on the bracket; and a rotatable pawl rotatably disposed on the slide seat, wherein after the pawl is meshed with the toothed segment, the pawl and the toothed segment form a unidirectional rotation structure.

[0012] Preferably, the control unit further includes: a drive wheel rotatably mounted on the bracket; a convex plate fixed to the sealing ring; and two arc plates fixed to the drive wheel, the ends of which are provided with ramps for pushing the convex plate to move. After the drive wheel rotates, the convex plate moves up and down through the cooperation of the two arc plates and the convex plate.

[0013] Preferably, the control unit further includes: a spring member for pushing the slide block closer to the tooth segment; a push plate fixed to the drive wheel, the end of the push plate having a ramp, and after the drive wheel rotates, the push plate pushes the slide block away from the spring member.

[0014] Preferably, the control unit further includes: a driven wheel rotatably mounted on the bracket, the driven wheel meshing with the driving wheel; lever assemblies respectively mounted at the bottom of the driving wheel and the driven wheel; and a plurality of grooves on the turntable corresponding to the lever assemblies, the grooves being evenly distributed in a ring, wherein after the driving wheel and the driven wheel rotate, the two sets of lever assemblies sequentially contact the grooves and drive the turntable to reciprocate.

[0015] Preferably, the push plate is staggered from the driven wheel and the turntable, and the top of the slide is provided with an extension section, which extends upward to be flush with the push plate.

[0016] Preferably, the control unit further includes: an incomplete gear fixed to the driven wheel; and a driven gear fixed to the rotating shaft. After the driven wheel rotates, the rotating shaft is intermittently driven to rotate through the cooperation of the incomplete gear and the driven gear.

[0017] The beneficial effects of this invention are as follows: 1. The gas-liquid two-phase flow meter of this invention, by setting up a metering tube and a secondary pipe, allows for rapid replacement of the orifice plate assembly when wear and leakage occur. The main pipe is closed and the secondary pipe is opened, allowing fluid to flow normally through the secondary pipe. Rotating the shaft changes the position of the old and new orifice plate assemblies, enabling quick replacement without shutting down the system. This ensures continuous flow measurement and improves efficiency compared to existing methods that require shutdown before replacement. During orifice plate assembly replacement, the main pipe is temporarily closed, preventing fluid from entering and facilitating the replacement process.

[0018] 2. The gas-liquid two-phase flow meter of the present invention seals the gap in the main pipeline by setting a sealing ring. Through the cooperation of the fastening plate and the sealing gasket, the sealing performance of the main pipeline can be further improved, which improves the problem of fluid leakage through the gap and ensures the smooth operation of the metering work.

[0019] 3. The gas-liquid two-phase flow meter of the present invention, through the cooperation of the control unit and the sealing unit, can realize the automatic replacement and sealing of the orifice plate assembly by simply controlling the rotation of the drive wheel, which has a high degree of automation and is easy to operate. Attached Figure Description

[0020] The invention will now be further described with reference to the accompanying drawings.

[0021] Figure 1 This is an overall perspective view of Embodiment 1 of the present invention; Figure 2 This is an exploded view of the metering tube, sealing part, and control part of the present invention; Figure 3This is an exploded view of the sealing ring, fastening plate, and swivel ring; Figure 4 This is a front view of the metering tube and its support; Figure 5 This is a 3D view of the shaft and perforated plate assembly; Figure 6 It is an exploded view of the driving wheel, driven wheel, and turntable; Figure 7 This is a bottom view of the structure of the drive wheel, driven wheel, and turntable. Figure 8 This is a schematic diagram of the drive gear and its gear segments; Figure 9 This is a schematic diagram of the slide and the anti-return pawl; Figure 10 It is a 3D diagram of the meshing structure of the driving wheel, driven wheel, turntable, and gear segment; In the diagram: 1. Metering tube; 11. Main pipe; 12. Inlet pipe; 13. Outlet pipe; 100. Detection section; 200. Pressure transmitter; 2. Notch; 3. Secondary pipe; 4. Valve component; 5. Support; 6. Rotary shaft; 7. Orifice plate assembly; 8. Sealing section; 81. Sealing ring; 82. Sealing gasket; 83. Fastening plate; 84. Rotary ring; 85. Wedge block; 9. Control section; 91. Gear segment; 92. Turntable; 921. Groove; 93. Slide seat; 931. Check pawl; 932. Spring component; 94. Drive wheel; 941. Arc plate; 942. Push plate; 95. Protruding plate; 96. Driven wheel; 961. Incomplete gear; 97. Lever assembly; 98. Driven gear. Detailed Implementation

[0022] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0023] Example 1: As Figure 1-5 As shown in the figure, a gas-liquid two-phase flow meter according to an embodiment of the present invention includes a metering tube 1, which includes a main pipe 11. The two ends of the main pipe 11 are respectively provided with an inlet pipe 12 and an outlet pipe 13. The main pipe 11 is provided with a detection unit 100 and a pressure transmitter 200. The detection unit 100 includes a temperature detection unit, a pressure detection unit and a flow rate detection unit. It also includes: a secondary pipe 3, the two ends of which are respectively connected to the inlet pipe 12 and the outlet pipe 13; a valve 4 for controlling the opening and closing of the secondary pipe 3 and the main pipe 11; a bracket 5 fixed to the outside of the main pipe 11; a rotating shaft 6 rotatably provided on the bracket 5; and a plurality of orifice plate assemblies 7 provided on the rotating shaft 6, one of which is located inside the main pipe 11. A notch 2 is provided in the main pipe 11 for the orifice plate assembly 7 to move.

[0024] Specifically, the detection unit is equipped with a computer for analyzing and calculating monitoring data. The combination of metering tube 1, detection unit 100, and pressure transmitter 200 can adopt the existing structure of a gas-liquid two-phase flow meter. The detection unit uses an integrated instrument, with pressure and differential pressure as current signals and temperature as a resistance signal. The instrument is powered internally, and the differential pressure is acquired internally. The instrument's measurement data includes real-time pressure, real-time temperature, instantaneous gas flow rate, cumulative gas volume, instantaneous liquid flow rate, cumulative liquid volume, gas density, instantaneous differential pressure, and differential pressure noise. With the pressure transmitter 200, the flow rates of the two media, gas and liquid, can be calculated based on the average value and variance of the differential pressure measurement. It should be noted that, in order to further improve the accuracy of the detection results, a rectifier can also be installed on metering tube 1. The rectifier can uniformly and simplify the flow pattern to improve the measurement results affected by factors such as uneven liquid velocity distribution and swirling flow in the pipeline.

[0025] Taking the installation of two orifice plate assemblies 7 on the rotating shaft 6 as an example, initially, the orifice plate assembly 7 on the left is located inside the main pipe 11 and blocks the notch 2. The orifice plate assembly 7 on the left is in working condition, and the orifice plate assembly 7 on the right is in standby condition. Of course, depending on the specific situation, a cover plate can also be set on the bracket 5 to protect the standby orifice plate assembly 7. Both the upper and lower ends of the main pipe 11 are in an open state, and both the upper and lower ends of the secondary pipe 3 are in a closed state. After the fluid flows in through the inlet pipe 12, it can only flow along the main pipe 11 and the outlet pipe 13 in sequence.

[0026] When measuring the flow rate of gas-liquid two-phase fluids in systems such as petroleum refining and wastewater treatment, the metering tube 1 is fixedly installed in the detection area. The fluid to be detected enters the main pipeline 11 through the inlet pipe 12. After the flow rate of the gas-liquid two-phase fluid is detected by the cooperation of the detection unit 100 and the pressure transmitter 200, the fluid flows out through the outlet pipe 13.

[0027] During operation, the orifice plate assembly 7 is always in contact with the fluid. After a period of operation, the orifice plate assembly 7 may experience wear and leakage, requiring replacement. When replacement is needed, valve 4 is operated to close both ends of the main pipe 11 and open both ends of the secondary pipe 3. The fluid flowing in from the inlet pipe 12 can only flow sequentially along the secondary pipe 3 and the outlet pipe 13. The rotating shaft 6 is then activated to remove the old orifice plate assembly 7 from the main pipe 11 and insert the new one. Then, valve 4 is operated again to open the main pipe 11 and close the secondary pipe 3, allowing the fluid to re-enter the main pipe 11 for continued metering. This allows for rapid replacement of the orifice plate assembly 7 without shutting down the system, enabling continuous flow metering. Compared to existing methods that require shutdown before replacement, this method significantly improves efficiency. During the replacement process, the main pipe 11 is temporarily closed, preventing further fluid entry and facilitating the replacement.

[0028] like Figure 1-4 As shown, the bracket 5 includes two parts located on the upper and lower sides of the notch 2, and the bracket 5 has space for the perforated plate assembly 7 to rotate.

[0029] like Figure 1-3 As shown, it also includes a sealing part 8, which includes a sealing ring 81 that is slidably sleeved on the outside of the main pipe 11. After the sealing ring 81 moves down, it covers the outside of the notch 2.

[0030] Specifically, during the metering process, the sealing ring 81 is at the bottom of its range of motion and covers the notch 2, further improving the sealing performance of the main pipeline 11 ring sidewall.

[0031] like Figure 2-8 As shown, the sealing part 8 also includes: a sealing gasket 82 disposed on the inner side wall of the sealing ring 81; two fastening plates 83 slidably disposed inside the sealing ring 81; a rotating ring 84 rotatably disposed inside the sealing ring 81; and a wedge 85 fixedly connected to the rotating ring 84. The end of the wedge 85 is provided with a bevel, and the fastening plate 83 is provided with a through groove corresponding to the wedge 85. After the rotating ring 84 rotates, the fastening plate 83 is moved by the wedge 85.

[0032] Specifically, the height of the sealing gasket 82 is greater than the height of the notch 2, and the fastening plate 83 is semi-circular. During the movement of the fastening plate 83, the movement towards the center of the main pipe 11 is considered inward movement, and the movement away from it is considered outward movement. After the rotating ring 84 rotates back and forth, it drives the fastening plate 83 to move inward and outward through the wedge block 85. After the fastening plate 83 moves inward, it compresses the sealing gasket 82, causing the sealing gasket 82 to adhere to the outer wall of the main pipe 11, thereby sealing the upper and lower sides of the notch 2 and further improving the sealing effect of the ring side wall of the main pipe 11. After the fastening plate 83 moves outward, it no longer presses against the sealing gasket 82, so that the sealing ring 81 can move smoothly up and down on the outside of the main pipe 11.

[0033] like Figure 3-10 As shown, it also includes a control unit 9, which includes: a toothed segment 91 fixed to the rotating ring 84; a turntable 92 rotatably mounted on the bracket 5, the turntable 92 being engaged with the toothed segment 91; a slide block 93 slidably mounted on the bracket 5; and a rotatable pawl 931 mounted on the slide block 93. After the pawl 931 is engaged with the toothed segment 91, the pawl 931 and the toothed segment 91 form a unidirectional rotation structure.

[0034] Specifically, the slide 93 moves in the lateral direction, and the anti-return pawl 931 is a unidirectional rotating structure. The anti-return pawl 931 is used to prevent the tooth segment 91 from rotating. After the turntable 92 rotates back and forth, it drives the rotating ring 84 to rotate back and forth through the tooth segment 91.

[0035] The rotating ring 84 rotates, causing the fixed plate to move inward. After the sealing gasket 82 is attached to the outer wall of the main pipe 11, the check pawl 931 can prevent the rotating ring 84 from rotating back, thereby ensuring the stability of the seal.

[0036] like Figure 3-8 As shown, the control unit 9 also includes: a drive wheel 94 rotatably mounted on the bracket 5; a protruding plate 95 fixed to the sealing ring 81; and two arc plates 941 fixed to the drive wheel 94. The ends of the arc plates 941 are provided with ramps for pushing the protruding plate 95 to move. After the drive wheel 94 rotates, the two arc plates 941 and the protruding plate 95 cooperate to drive the protruding plate 95 to move up and down.

[0037] Specifically, the bracket 5 is equipped with a motor for driving the drive wheel 94 to rotate. There is a gap between the two arc plates 941, and the width of the gap is greater than the width of the convex plate 95 so that the convex plate 95 can move up and down. After the drive wheel 94 rotates, the sealing ring 81 is driven to move up and down through the cooperation of the two arc plates 941 and the convex plate 95.

[0038] like Figure 6-10As shown, the control unit 9 also includes: a spring member 932 for pushing the slide 93 closer to the tooth segment 91; a push plate 942 fixed to the drive wheel 94, the end of the push plate 942 being provided with a ramp, and after the drive wheel 94 rotates, the push plate 942 pushes the slide 93 away from the spring member 932.

[0039] Specifically, the two ends of the spring 932 are connected to the slide 93 and the bracket 5 respectively. The inner wall of the push plate 942 is arc-shaped. During the rotation of the drive wheel 94, the push plate 942 contacts the slide 93 and drives the slide 93 to move, so that the anti-return pawl 931 separates from the tooth segment 91.

[0040] like Figure 3-10 As shown, the control unit 9 also includes: a driven wheel 96 rotatably mounted on the bracket 5, which meshes with the driving wheel 94 for transmission; lever assemblies 97 respectively mounted on the bottom of the driving wheel 94 and the driven wheel 96; and a plurality of grooves 921 on the turntable 92 corresponding to the lever assemblies 97, the grooves 921 being evenly distributed in a ring. After the driving wheel 94 and the driven wheel 96 rotate, the two sets of lever assemblies 97 sequentially contact the grooves 921 and drive the turntable 92 to reciprocate.

[0041] Specifically, a gear 1 is fixedly connected to the driven wheel 96, and a gear 2 is fixedly connected to the driving wheel 94. The gear 2 meshes with the gear 1. After the driving wheel 94 rotates, it drives the driven wheel 96 to rotate synchronously in the opposite direction. During the rotation of the driving wheel 94 and the driven wheel 96, the two sets of lever assemblies 97 contact the groove 921 in sequence, thereby driving the turntable 92 to rotate back and forth. The turntable 92 drives the rotating ring 84 to rotate back and forth, and the rotating ring 84 drives the fastening plate 83 to move in and out.

[0042] like Figure 2-7 As shown, the push plate 942 is staggered from the driven wheel 96 and the turntable 92. The top of the slide 93 is provided with an extension section, which extends upward to be flush with the push plate 942.

[0043] Specifically, the slide 93 is located between the toothed segment 91 and the driving wheel 94, and the orifice plate assembly 7 is located below the driving wheel 94 and the driven wheel 96. The staggered arrangement ensures that the rotation of the driving wheel 94, the driven wheel 96, the turntable 92, and the orifice plate assembly 7 does not interfere with each other, so that these structures can move normally.

[0044] Example 2: Figure 7 As shown in the first embodiment, another embodiment of the present invention is as follows: the control unit 9 further includes: an incomplete gear 961 fixed to the driven wheel 96; and a driven gear 98 fixed to the rotating shaft 6. After the driven wheel 96 rotates, the rotating shaft 6 is intermittently driven to rotate through the cooperation of the incomplete gear 961 and the driven gear 98.

[0045] Specifically, during the rotation of the driven wheel 96, the incomplete gear 961 comes into contact with the driven gear 98, which can drive the rotating shaft 6 to rotate, thereby driving the orifice plate assembly 7 to rotate, and thus performing the replacement of the orifice plate assembly 7.

[0046] Working principle: When measuring the flow rate of gas-liquid two-phase fluids in systems such as petroleum refining and wastewater treatment, the metering tube 1 is fixedly installed in the detection area. The fluid to be detected enters the main pipeline 11 through the inlet pipe 12. After the flow rate of the gas-liquid two-phase fluid is detected by the cooperation of the detection unit 100 and the pressure transmitter 200, the fluid flows out through the outlet pipe 13.

[0047] When the orifice plate assembly 7 needs to be replaced due to wear and leakage after working for a period of time, the valve 4 is operated so that both the upper and lower ends of the main pipe 11 are closed and both the upper and lower ends of the secondary pipe 3 are open. The fluid flowing in from the inlet pipe 12 can only flow along the secondary pipe 3 and the outlet pipe 13 in sequence. The drive wheel 94 is started to rotate by a motor or other device. After the drive wheel 94 rotates, the push plate 942 on the drive wheel 94 contacts the slide 93 and drives the slide 93 to move, so that the anti-return pawl 931 separates from the tooth segment 91. After the drive wheel 94 rotates, it drives the driven wheel 96 to rotate synchronously in the opposite direction. During the rotation of the drive wheel 94 and the driven wheel 96, one of the lever assemblies 97 contacts the groove 921, which drives the turntable 92 to rotate. The turntable 92 drives the rotating ring 84 to rotate. The rotating ring 84 drives the fastening plate 83 to move outward. After the fastening plate 83 moves outward, it no longer presses against the sealing gasket 82, so that the sealing ring 81 can move up and down smoothly on the outside of the main pipe 11. The drive wheel 94 continues to rotate, and one of the arc plates 941 contacts the convex plate 95 and drives the convex plate 95 and the sealing ring 81 to move upward, so that the sealing ring 81 moves above the notch 2 and the notch 2 is opened; After the gap 2 is opened, the incomplete gear 961 on the driven wheel 96 rotates until it contacts the driven gear 98, which drives the rotating shaft 6 to rotate, so that the old orifice plate assembly 7 is moved out of the main pipe 11 and the new orifice plate assembly 7 is moved into the main pipe 11. As the drive wheel 94 continues to rotate, another arc plate 941 contacts the convex plate 95 and drives the convex plate 95 and the sealing ring 81 to move down, re-sealing the notch 2; The driving wheel 94 and the driven wheel 96 continue to rotate, and another set of lever assembly 97 contacts the groove 921, driving the turntable 92 to rotate. The turntable 92 drives the rotating ring 84 to rotate, and the rotating ring 84 drives the fastening plate 83 to move inward. After the fastening plate 83 moves inward, it squeezes the sealing gasket 82, causing the sealing gasket 82 to adhere to the outer wall of the main pipe 11, thereby sealing the upper and lower sides of the notch 2 and further improving the sealing effect of the ring side wall of the main pipe 11. The push plate 942 separates from the slide 93. The slide 93 moves inward under the push of the spring 932. The check pawl 931 contacts the tooth segment 91 to prevent the rotating ring 84 from rotating, thereby ensuring the stability of the seal. Then, the valve 4 is operated again to open the main pipe 11 and close the secondary pipe 3, allowing the fluid to re-enter the main pipe 11 and continue the metering work. The entire device returns to its initial state. In this way, the replacement of the orifice plate assembly 7 can be completed quickly without stopping the machine, so as to continuously perform flow metering. When using this flow meter, only the rotation of the drive wheel 94 needs to be controlled to realize the replacement and sealing of the orifice plate assembly 7. It has a high degree of automation and is easy to operate.

[0048] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A gas-liquid two-phase flow meter, comprising a metering tube (1), the metering tube (1) comprising a main pipe (11), the two ends of the main pipe (11) being respectively provided with an inlet pipe (12) and an outlet pipe (13), the main pipe (11) being provided with a detection unit (100) and a pressure transmitter (200), the detection unit (100) comprising a temperature detection unit, a pressure detection unit and a flow rate detection unit, characterized in that: Also includes: A secondary pipe (3) is connected at both ends to the inlet pipe (12) and the outlet pipe (13), respectively. Valve (4) for controlling the opening and closing of the secondary pipeline (3) and the main pipeline (11); A bracket (5) is fixed to the outside of the main pipe (11); Rotate the shaft (6) mounted on the bracket (5); A plurality of orifice plate assemblies (7) are provided on the rotating shaft (6), one of the orifice plate assemblies (7) being located inside the main pipe (11), and the main pipe (11) having a notch (2) for the orifice plate assembly (7) to move.

2. The gas-liquid two-phase flow meter according to claim 1, characterized in that: The bracket (5) comprises two parts located on the upper and lower sides of the notch (2), and the bracket (5) has space for the perforated plate assembly (7) to rotate.

3. The gas-liquid two-phase flow meter according to claim 2, characterized in that: It also includes a sealing part (8), which includes a sealing ring (81) that is slidably sleeved on the outside of the main pipe (11), and the sealing ring (81) covers the outside of the notch (2) after it moves down.

4. A gas-liquid two-phase flow meter according to claim 3, characterized in that: The sealing part (8) further includes: A sealing gasket (82) is provided on the inner side wall of the sealing ring (81); Two fastening plates (83) are slidably disposed inside the sealing ring (81); Rotate the rotating ring (84) located inside the sealing ring (81); A wedge (85) is fixed to the rotating ring (84). The end of the wedge (85) is provided with a bevel. A through groove corresponding to the wedge (85) is opened in the fastening plate (83). After the rotating ring (84) rotates, the fastening plate (83) is moved by the wedge (85).

5. A gas-liquid two-phase flow meter according to claim 4, characterized in that: It also includes a control unit (9), which includes: The tooth segment (91) is fixed to the rotating ring (84); Rotate the turntable (92) mounted on the bracket (5), and the turntable (92) engages with the toothed segment (91): Sliding seat (93) mounted on the bracket (5); Rotate the anti-return pawl (931) provided on the slide (93). After the anti-return pawl (931) and the tooth segment (91) are engaged, the anti-return pawl (931) and the tooth segment (91) form a unidirectional rotation structure.

6. A gas-liquid two-phase flow meter according to claim 5, characterized in that: The control unit (9) further includes: Rotate the drive wheel (94) mounted on the bracket (5); A protruding plate (95) is fixed to the sealing ring (81); Two arc plates (941) are fixed to the drive wheel (94). The ends of the arc plates (941) are provided with ramps for pushing the convex plate (95) to move. After the drive wheel (94) rotates, the convex plate (95) is driven to move up and down through the cooperation of the two arc plates (941) and the convex plate (95).

7. A gas-liquid two-phase flow meter according to claim 6, characterized in that: The control unit (9) further includes: A spring (932) for pushing the slide (93) closer to the toothed segment (91); A push plate (942) is fixed to the drive wheel (94). The end of the push plate (942) is provided with a ramp. After the drive wheel (94) rotates, the push plate (942) pushes the slide (93) away from the spring (932).

8. A gas-liquid two-phase flow meter according to claim 7, characterized in that: The control unit (9) further includes: Rotate the driven wheel (96) mounted on the bracket (5), and the driven wheel (96) meshes with the driving wheel (94) for transmission; A lever assembly (97) is respectively provided at the bottom of the driving wheel (94) and the driven wheel (96). A number of grooves (921) corresponding to the lever assembly (97) are provided on the turntable (92). The grooves (921) are evenly distributed in a ring. After the driving wheel (94) and the driven wheel (96) rotate, the two sets of lever assemblies (97) contact the grooves (921) in sequence and drive the turntable (92) to rotate back and forth.

9. A gas-liquid two-phase flow meter according to claim 8, characterized in that: The push plate (942) is staggered from the driven wheel (96) and the turntable (92). The top of the slide (93) is provided with an extension section, which extends upward to be flush with the push plate (942).

10. A gas-liquid two-phase flow meter according to claim 9, characterized in that: The control unit (9) further includes: An incomplete gear (961) fixed to the driven wheel (96); The driven gear (98) is fixed on the rotating shaft (6). After the driven gear (96) rotates, it intermittently drives the rotating shaft (6) to rotate through the cooperation of the incomplete gear (961) and the driven gear (98).

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