A multiphase flow meter and method of measuring thereof

Abstract

The application discloses a multiphase fluid flowmeter, which comprises a flowmeter base, at least two pressure sensors and at least one pressure reducing device; the pressure reducing device is arranged in the flowmeter base, and the pressure sensors are arranged at two ends of the pressure reducing device. The flowmeter does not need movable structures such as impellers to calculate flow, so that the flowmeter is simple and exquisite in structure, differential pressure measurement and flow conversion can provide a wider linear region, and the design without movable structures can ensure accuracy and facilitate replacement, so that the flowmeter can not be limited by fluid types and viscosity, and has a wider application range.

Description

A multiphase fluid flow meter and its measurement method Technical Field

[0001] This invention relates to the field of fluid metering and testing technology, and more specifically, to a multiphase fluid flow meter and its measurement method. Background Technology

[0002] A flow meter is an instrument that indicates the measured flow rate and / or the total amount of fluid within a selected time interval. Simply put, it's an instrument used to measure the flow rate of fluid in pipes or open channels.

[0003] Currently, there are several principles used for detecting flow rate; only a few are listed below:

[0004] 1. Coriolis flow meter

[0005] This type of flow meter uses the deflection generated by a vibrating fluid tube to measure the mass flow rate. Coriolis flow meters can be used to measure the mass flow rate of liquids, slurries, gases, or steam. They offer high accuracy. However, regular maintenance of the pipe walls is necessary to prevent corrosion.

[0006] 2. Volumetric flow meter

[0007] Flow meters are used to measure the volumetric flow rate of liquids or gases. They introduce the fluid into a metering space and count the number of rotations. Impellers, gears, pistons, or orifice plates are used to distribute the fluid. PD flow meters offer high accuracy and are one of several methods for measuring viscous liquids. However, they can introduce irreversible pressure errors and require moving parts.

[0008] 3. Turbine flow meter

[0009] When fluid flows through a turbine flow meter, the fluid causes the rotor to rotate. The rotor's rotational speed is related to the fluid velocity. The flow rate or total volume is derived from the average fluid velocity sensed by the rotor. Turbine flow meters can accurately measure clean liquids and gases. Like PD flow meters, turbine flow meters also produce irreversible pressure errors and require moving parts.

[0010] 4. Vortex flow meter

[0011] A vortex flow meter uses a non-streamlined vortex generator placed in a fluid. The velocity of the vortex is proportional to the fluid velocity, allowing for the calculation of the volumetric flow rate. Vortex flow meters are suitable for measuring liquids, gases, or steam. They have no moving parts and are not prone to fouling. However, vortex flow meters can generate noise and require a relatively high fluid velocity to create the vortices.

[0012] In summary, based on their different operating principles, flow meters are only suitable for fluid flow detection within the regions where their principles are clearly defined. Some are structurally complex; some are bulky; some have narrow linear flow detection ranges; some are limited by the type of fluid; and some can only detect low-viscosity flows. Furthermore, movable structures can lead to decreased accuracy and maintenance difficulties. How to reduce or even eliminate the use of moving parts to achieve flow detection, while also being applicable to the measurement of single-phase and multiphase fluids, is a pressing technical problem that needs to be solved. Therefore, it is necessary to propose a flow meter and pressure drop structure suitable for fluid detection to at least partially solve the problems existing in the current technology. Summary of the Invention

[0013] The summary section introduces a series of simplified concepts, which will be further explained in detail in the detailed description section. The summary section of this invention is not intended to limit the key features and essential technical features of the claimed technical solution, nor is it intended to determine the scope of protection of the claimed technical solution.

[0014] To at least partially solve the above problems, the present invention provides a multiphase fluid flow meter, comprising: a flow meter base, at least two pressure sensors and at least one pressure reducing device; the pressure reducing device is disposed within the flow meter base, and the pressure sensors are disposed at both ends of the pressure reducing device.

[0015] Preferably, it also includes a connecting sleeve, which is fitted onto the outer wall of the flow meter base, and the inner wall of the flow meter base is provided with a connecting strip.

[0016] Preferably, the connecting sleeve is provided with a first reading port and a second reading port, both of which are in communication with the interior of the connecting strip. The first reading port and the second reading port are used for circuit connection of the pressure sensor.

[0017] Preferably, the connecting strip is provided with a first detection port and a second detection port at both ends, the first detection port and the second detection port are respectively located at both ends of the pressure reducing device, and a pressure sensor is provided on the first detection port and the second detection port respectively. The first detection port, the second detection port, the first reading port and the second reading port are interconnected.

[0018] Preferably, the pressure-reducing device includes a pressure-reducing channel and a normal channel; the pressure-reducing channel and the normal channel have the same structure, both of which are disposed on the connecting strip, and the pressure-reducing channel and the normal channel are disposed in opposite directions.

[0019] Preferably, the voltage reduction channel includes a first channel, a second channel, a third channel, and a fourth channel; the first channel and the fourth channel are connected in a straight line and pass through both ends of the voltage reduction channel; the second channel is located on the same side as the first channel and is arranged parallel to it; the second channel is connected to the fourth channel through the third channel; and the angle between the third channel and the fourth channel is an acute angle.

[0020] Preferably, there are two pressure-reducing devices, and the interior of the flow meter base is divided into a normal section and a pressure-reducing section by the two pressure-reducing devices.

[0021] Preferably, there are two connecting sleeves and two connecting strips, and the two connecting sleeves and two connecting strips are symmetrically arranged. The two connecting strips are respectively connected to two pressure reducing devices. The two pressure reducing devices are divided into a gas phase device and a liquid phase device. The gas phase device is located above the liquid phase device. The two ends of the gas phase device are provided with screening tubes. The connecting strip connected to the gas phase device is located inside the screening tube. The two ends of the connecting strip connected to the liquid phase device are provided with drainage devices. The drainage devices are located outside the two pressure sensors of the liquid phase device.

[0022] Preferably, one end of the screening tube is connected to the end of the gas phase device, and the other end is a closed port. Several air holes are closely arranged at the bottom of the screening tube, and the diameter of the air holes is no greater than 0.5 mm. The inner bottom of the screening tube is covered with a pad layer, which is made of a breathable but waterproof material. The pressure sensors at both ends of the gas phase device are located above the pad layer.

[0023] Preferably, the drainage device includes a cover plate, a main fin, and two auxiliary fins. The main fin and the auxiliary fins have teardrop-shaped cross-sections with one end curved and the other end conical. The cover plate is triangular, and the main fin and the auxiliary fins are both disposed on the cover plate. The cover plate is connected to the liquid phase device via the main fin and the auxiliary fins. Diverting protrusions are provided on the curved end faces of the main fin and the auxiliary fins. The main fin is located on the center line of the cover plate, and the two auxiliary fins are respectively located on both sides of the main fin. The cover plate is provided with an air groove and a diverting groove. The air groove is located on the same side as the main fin and is disposed between the main fin and the auxiliary fins. The diverting groove is located on the opposite side of the main fin and is located on the side of the cover plate.

[0024] A measurement method for a multiphase fluid flow meter, characterized by the following steps:

[0025] S1: The pressure sensor at the first detection port detects and records the pressure value of the fluid;

[0026] S2: The fluid enters from one end of the pressure reducing device, and after being depressurized by the pressure reducing device, it is discharged from the other end;

[0027] S3: The pressure sensor at the second detection port detects and records the pressure value of the depressurized fluid.

[0028] S4: The terminal compares the pressure values ​​before and after the pressure drop, and calculates the current flow rate value through the relationship between the pressure difference and the flow rate.

[0029] Compared with the prior art, the present invention has at least the following beneficial effects:

[0030] This flow meter does not require a moving structure such as an impeller for flow calculation, so it can be used to measure the flow rate of different types of fluids. When the fluid reaches the flow meter, the pressure sensor at the front end of the pressure reducing device first detects and records the fluid pressure. Then, the fluid flows out from the rear end after being depressurized by the pressure reducing device. The pressure value of the depressurized fluid is detected and recorded by the pressure sensor at the rear end of the pressure reducing device. The pressure difference before and after the pressure reduction can be converted into flow rate using a formula, and the real-time flow rate of the fluid in the flow meter base is displayed at the terminal. Through the above structural design, this flow meter has a simple and compact structure. The pressure difference measurement and flow rate conversion can provide a wide linear range. Furthermore, the absence of a moving structure ensures accuracy and ease of replacement, allowing this flow meter to be used without being limited by the type and viscosity of the fluid, thus having a wider range of applications.

[0031] The multiphase fluid flow meter and its measurement method described in this invention, along with other advantages, objectives, and features of the invention, will be partly apparent from the following description and partly understood by those skilled in the art through study and practice of the invention. Attached Figure Description

[0032] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0033] Figure 1a is a schematic diagram of the structure of the multiphase fluid flow meter of the present invention.

[0034] Figure 1b is a schematic diagram of the circuit connection of the multiphase fluid flow meter of the present invention.

[0035] Figure 2 is a schematic diagram of the internal structure of the multiphase fluid flow meter of the present invention.

[0036] Figure 3 is a cross-sectional view of the multiphase fluid flow meter described in this invention.

[0037] Figure 4 is a cross-sectional view of the pressure reduction channel in the multiphase fluid flow meter of the present invention.

[0038] Figure 5 is a schematic diagram of the flow meter for measuring the flow rate of multiphase fluids.

[0039] Figure 6 is a schematic diagram of a flow meter for measuring the flow rate of multiphase fluids.

[0040] Figure 7 is a cross-sectional view of Figure 5.

[0041] Figure 8 is a cross-sectional view of Figure 5.

[0042] Figure 9 is a diagram showing the gas-liquid flow direction in the sieve tube of the multiphase fluid flowmeter described in this invention.

[0043] Figure 10 is a schematic diagram of the flow diversion device in the multiphase fluid flow meter of the present invention.

[0044] Figure 11 is a top view of the flow diversion device in the multiphase fluid flow meter of the present invention.

[0045] Figure 12 is a schematic diagram of the flow diversion device in the multiphase fluid flow meter of the present invention.

[0046] Figure 13 shows the linear relationship between pressure difference and fluid flow rate (R). 2 >0.9; 2m 3 / h-120m 3 / h).

[0047] Figure 14 shows the linear relationship between pressure difference and fluid flow rate (R). 2 >0.9; 0.1m 3 / h~3m 3 / h).

[0048] Figure 15 shows the linear relationship between pressure difference and fluid flow rate (R). 2 >0.9; 0.001m 3 / h~0.1m 3 / h).

[0049] Figure 16 shows the linear relationship between pressure difference and fluid flow rate.

[0050] In the figure: 1 Flowmeter base, 2 Connecting sleeve, 21 First reading port, 22 Second reading port, 23 First detection port, 24 Second detection port, 3 Pressure sensor, 4 Pressure reducing device, 41 Pressure reducing channel, 411 First channel, 412 Second channel, 413 Third channel, 414 Fourth channel, 42 Normal channel, 5 Connecting strip, 6 Screening pipe, 61 Pad, 7 Drainage device, 71 Cover plate, 72 Main fin, 73 Secondary fin, 731 Diverting protrusion, 74 Air groove, 75 Diverting groove. Detailed Implementation

[0051] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments, so that those skilled in the art can implement it based on the description.

[0052] It should be understood that terms such as “having,” “comprising,” and “including” as used herein do not exclude the presence or addition of one or more other elements or combinations thereof.

[0053] As shown in Figures 1-16, the present invention provides a multiphase fluid flow meter, comprising: a flow meter base 1, at least two pressure sensors 3 and at least one pressure reducing device 4; the pressure reducing device 4 is disposed within the flow meter base 1, and the pressure sensors 3 are disposed at both ends of the pressure reducing device 4.

[0054] The working principle and beneficial effects of the above technical solution: This flowmeter does not require a moving structure such as an impeller for flow calculation, so it can be applied to measure the flow rate of different types of fluids. When the fluid reaches the flowmeter, it first passes through the pressure sensor 3 at the front end of the pressure reducing device 4 to detect and record the fluid pressure. Then, the fluid flows out from the rear end after being depressurized by the pressure reducing device 4. The depressurized fluid is detected and recorded by the pressure sensor 3 at the rear end of the pressure reducing device 4. The pressure difference before and after the fluid pressure reduction can be converted into flow rate by a formula, so that the real-time flow rate of the fluid in the flowmeter base 1 can be displayed at the terminal. Through the design of the above structure, the flowmeter has a simple and compact structure. The pressure difference measurement and flow rate conversion can provide a wide linear range. Furthermore, the design without a moving structure ensures accuracy and easy replacement, allowing the flowmeter to be used without being limited by the type and viscosity of the fluid, thus having a wider range of applications, as shown in Figure 13-16.

[0055] In one embodiment, a connecting sleeve 2 is further included, which is sleeved on the outer wall of the flow meter base 1, and a connecting strip 5 is provided on the inner wall of the flow meter base 1.

[0056] The working principle and beneficial effects of the above technical solution are as follows: A connecting sleeve 2 is fitted outside the flow meter base 1 to connect various circuits of the pressure sensor 3.

[0057] This embodiment provides a flow meter applicable to any fluid. The connecting sleeve 2 is provided with a first reading port 21 and a second reading port 22, both of which are internally connected to the connecting strip 5. The first reading port 21 and the second reading port 22 are used for circuit connection to the pressure sensor 3. The two ends of the connecting strip 5 are respectively provided with a first detection port 23 and a second detection port 24, located at the two ends of the pressure-reducing device 4. A pressure sensor 3 is respectively installed on the first detection port 23 and the second detection port 24. The first detection port 23, the second detection port 24, the first reading port 21, and the second reading port 22 are interconnected. The pressure-reducing device 4 includes a pressure-reducing channel 41 and a normal channel 42; the pressure-reducing channel 41 and the normal channel 42 have the same structure and are both located on the connecting strip 5, but their directions are opposite. The pressure-reducing channel 41 includes a first channel 411, a second channel 412, a third channel 413, and a fourth channel 414. The first channel 411 and the fourth channel 414 are connected in a straight line and pass through both ends of the pressure-reducing channel 41. The second channel 412 is located on the same side as the first channel 411 and is arranged parallel to it. The second channel 412 is connected to the fourth channel 414 through the third channel 413, and the angle between the third channel 413 and the fourth channel 414 is an acute angle. There are two pressure-reducing devices 4, and the interior of the flowmeter base 1 is divided into a normal part and a pressure-reducing part by the two pressure-reducing devices 4.

[0058] The working principle and beneficial effects of the above technical solution: The pressure reducing device 4 consists of two parts, a pressure reducing channel 41 and a normal channel 42, which are arranged in opposite directions. The part that can slow down and reduce the pressure of the fluid is the pressure reducing channel 41. Rotating the pressure reducing channel 41 by 180 degrees will obtain the normal channel 42. When the pressure reducing channel 41 slows down and reduces the pressure of the fluid, the fluid will first enter the first channel 411 and the second channel 412 simultaneously. The fluid in the second channel 412 will flow through the third channel 413 to the intersection of the first channel 411 and the fourth channel 414. Because the angle between the third channel 413 and the fourth channel 414 is an acute angle, the direction of the fluid in the third channel 413 is opposite to the direction of the fluid in the first channel 411, thus allowing the fluid to enter the fourth channel 414. The fluid velocity within channel 414 decreases, resulting in both the flow velocity and pressure at the inlet of the first channel 411 being greater than those at the outlet of the fourth channel 414. The pressure sensors 3 at both ends detect this pressure difference and convert it into flow rate information. When the pressure-reducing channel 41 slows the fluid, it enters from the fourth channel of the normal channel 42 and merges with the first channel. Part of the fluid exits through the first channel, while the remaining fluid is diverted to the third channel and then flows out through the second channel. Because the second and first channels are located on the same side and are parallel, there is no change in flow velocity or pressure. To further reduce the impact of the normal channel 42 on flow velocity and pressure, the first and second channels can also be... Enlarging the opening increases the flow area of ​​the normal channel 42. When only one pressure-reducing device 4 is installed, the space between the bottom of the pressure-reducing device 4 and the inner wall of the flowmeter base 1 can be open (suitable for high-viscosity fluids, as the deceleration and pressure reduction effect of high-viscosity fluids through the pressure-reducing channel 41 is more obvious, thus preventing clogging) or closed (increasing the deceleration and pressure reduction effect of the pressure-reducing channel 41, thereby improving detection sensitivity). Similarly, two pressure-reducing devices 4 can be installed above and below, and the two pressure-reducing channels 41 can be located on the same side (increasing the deceleration and pressure reduction amplitude while ensuring fluid flow rate, thereby improving detection sensitivity) or on different sides (providing comprehensive and uniform deceleration for the fluid within the flowmeter base 1). (To reduce pressure and avoid local high and low pressure situations), by setting up a pressure-reducing channel 41 and a normal channel 42, the flow meter does not need to be adjusted when the liquid in the flow meter base 1 changes flow direction. As the fluid direction changes, the pressure-reducing channel 41 before the change can be used as the normal channel 42 after the change, and the normal channel 41 before the change can be used as the pressure-reducing channel 41 after the change. Thus, the flow meter can be used to detect both forward and reverse fluids. The two pressure sensors 3 are located at both ends of the pressure-reducing device 4, so differential pressure can still be detected when the fluid in the flow meter base 1 changes direction. The flow meter provided in this embodiment can be used to measure single-phase fluids (pure gas phase fluid or pure liquid phase fluid).

[0059] This embodiment provides a flow meter for measuring the gas phase flow rate in a multiphase fluid. The pressure-reducing device 4 in this embodiment is called the gas phase device. The gas phase device has sieve tubes 6 at both ends, and the connecting strip 5, which connects to the gas phase device, is located inside the sieve tubes 6. One end of the sieve tube 6 is connected to the end of the gas phase device, and the other end is a closed port. Several air holes are closely arranged at the bottom of the sieve tube 6, with a diameter not exceeding 0.5 mm. The inner bottom of the sieve tube 6 is covered with a padding layer 61, which is made of a breathable but waterproof material. The pressure sensors 3 at both ends of the gas phase device are located above the padding layer 61.

[0060] The working principle and beneficial effects of the above technical solution are as follows: This embodiment provides a flow meter for measuring the gas phase flow rate in a multiphase fluid (usually a mixture of gas and liquid phases, such as petroleum containing associated gas). When the fluid reaches the flow meter, it impacts the end of the sieve tube 6, thereby changing the flow direction. Through impact and change of direction, the gas in the fluid can be dispersed, thereby increasing the amount of gas entering the sieve tube 6. When the fluid flows under the normal section of the sieve tube 6, the gas enters the interior of the sieve tube 6 through the air holes and fills the internal space. At the bottom of the inner part of the sieve tube 6, there is a permeable but waterproof structure. The pad 61, made of a material (such as non-woven fabric), further prevents liquid from entering the sieve tube 6. Gas entering the sieve tube 6 will pass through the pressure-reducing device 4 to the pressure-reducing section of the sieve tube 6, and finally be carried away by the flowing liquid through the vent. Because the normal section of the sieve tube 6 reduces the flow area of ​​the flowmeter base 1, the liquid flow velocity increases. Therefore, the depressurized gas can flow faster into the interior of the pressure-reducing section of the flowmeter base 1 under the negative pressure created by the rapidly flowing liquid, thus preventing gas accumulation and high pressure in the pressure-reducing section of the sieve tube 6, thereby avoiding affecting measurement accuracy. The presence of sieve tubes 6 at both ends of the gas phase device allows this flowmeter to be used for detecting fluids in both forward and reverse directions without adjusting the flowmeter's direction.

[0061] This embodiment provides a flow meter for measuring the flow rate of the liquid phase in a multiphase fluid. The pressure reducing device 4 in this embodiment is called the liquid phase device. The two ends of the connecting strip 5 connected to the liquid phase device are provided with flow guiding devices 7. The flow guiding devices 7 are located outside the two pressure sensors 3 of the liquid phase device. The drainage device 7 includes a cover plate 71, a main fin 72, and two auxiliary fins 73. The main fin 72 and the auxiliary fins 73 have teardrop-shaped cross-sections with one end curved and the other end conical. The cover plate 71 is triangular. The main fin 72 and the auxiliary fins 73 are both disposed on the cover plate 71. The cover plate 71 is connected to the connecting strip 5 of the liquid phase device through the main fin 72 and the auxiliary fins 73. The arc-shaped end faces of the main fin 72 and the auxiliary fins 73 are provided with diversion protrusions 731. The main fin 72 is located on the center line of the cover plate 71. The two auxiliary fins 73 are respectively located on both sides of the main fin 72. The cover plate 71 is provided with an air groove 74 and a diversion groove 75. The air groove 74 is located on the same side as the main fin 72 and is disposed between the main fin 72 and the auxiliary fins 73. The diversion groove 75 is located on the opposite side of the main fin 72 and is located on the side of the cover plate 71.

[0062] The working principle and beneficial effects of the above technical solution: This embodiment provides a flow meter for measuring liquid phase flow in a multiphase fluid. Because measuring liquid phase flow does not require gas separation, it is only necessary to ensure the continuity of the fluid's impact on the pressure sensor 3. Therefore, a flow guiding device 7 needs to be set before the pressure sensor 3 to guide the fluid and guide the gas. The cover plate 71 is triangular, with the base of the triangle close to the liquid phase device and a buffer slope provided at the base. The fluid is stabilized under the guidance of the main fin 72 and the secondary fin 73. At the same time, some air bubbles mixed in the fluid will accumulate on the gas groove 74 and be guided out during the stabilization process. The fluid after stabilization can be used to pressurize the pressure sensor 3. Force sensor 3 provides relatively stable fluid impact, thereby reducing fluctuations during pressure sensor 3 detection. Diversion protrusions 731 are provided on the arc-shaped end faces of main fin 72 and secondary fin 73 to increase impact resistance and reduce the impact of cavitation on pressure sensor 3, thereby increasing the service life of pressure sensor 3. Several diversion grooves 75 are provided on the top surface of cover plate 71 (the opposite side of main fin 72). The angle between the diversion grooves 75 and the bottom edge of cover plate 71 is an acute angle. Under the action of the diversion grooves 75, the fluid above cover plate 71 can be dispersed to the outside of cover plate 71, thereby reducing the cavitation damage to the liquid phase device caused by bubbles generated when the fluid on the upper and lower sides of cover plate 71 merges.

[0063] This embodiment provides a flow meter capable of separately measuring the gas phase and liquid phase flow rates in a multiphase fluid. There are two connecting sleeves 2 and two connecting strips 5, symmetrically arranged. The two connecting strips 5 are respectively connected to two pressure-reducing devices 4. The two pressure-reducing devices 4 are divided into a gas phase device and a liquid phase device. The gas phase device is located above the liquid phase device, and both ends of the gas phase device are provided with sieve tubes 6. The connecting strips 5 connected to the gas phase device are located inside the sieve tubes 6. Both ends of the connecting strips 5 connected to the liquid phase device are provided with flow-guiding devices 7, located outside the two pressure sensors 3 of the liquid phase device.

[0064] The working principle and beneficial effects of the above technical solution are as follows: When it is necessary to measure the flow rate of liquid phase and gas phase simultaneously, liquid phase device and gas phase device can be set up at the same time, and the gas phase device is ensured to be located above the liquid phase device, so that the gas can smoothly enter the sieve tube 6. Through the design of the above structure, the flow rate of liquid phase fluid and gas phase fluid in the flow meter base 1 can be detected at the same time, and no movable structure is required during the detection process, so that this flow meter can be applied to the flow measurement of multiple types of multiphase fluids.

[0065] This invention provides a measurement method for a multiphase fluid flow meter, comprising the following steps:

[0066] S1: The pressure sensor 3 at the first detection port 23 detects and records the pressure value of the fluid;

[0067] S2: The fluid enters from one end of the pressure reducing device 4, and after being depressurized by the pressure reducing device 4, it is discharged from the other end;

[0068] S3: The pressure value of the depressurized fluid is detected and recorded by the pressure sensor 3 at the second detection port 24;

[0069] S4: The terminal compares the pressure values ​​before and after the pressure drop, and calculates the current flow rate value through the relationship between the pressure difference and the flow rate.

[0070] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0071] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0072] Although embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for the present invention. Other modifications can be easily made by those skilled in the art. Therefore, without departing from the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. A multiphase fluid flow meter, characterized in that, include: The flowmeter base (1), at least two pressure sensors (3), and at least one pressure reducing device (4) are provided; the pressure reducing device (4) is disposed inside the flowmeter base (1), and the pressure sensors (3) are disposed at both ends of the pressure reducing device (4); the flowmeter base (1) is provided with a first reading port (21) and a second reading port (22); the flowmeter base (1) is provided with a first detection port (23) and a second detection port (24), and the first detection port (23) and the second detection port (24) are disposed inside the flowmeter base (1). Inside the pressure reducing device (4), and located at both ends of the pressure reducing device (4), the first detection port (23) and the second detection port (24) are respectively provided with a pressure sensor (3). The first detection port (23) is interconnected with the first reading port (21), the second detection port (24) and the second reading port (22). The first reading port (21) and the second reading port (22) are used for circuit connection of the pressure sensor (3); it also includes a connecting sleeve (2), which is sleeved on the flow meter base (1) On the outer wall of the flowmeter base (1), a connecting strip (5) is provided on the inner wall of the flowmeter base (1). The connecting sleeve (2) is provided with the first reading port (21) and the second reading port (22). The first reading port (21) and the second reading port (22) are both connected to the inside of the connecting strip (5). The two ends of the connecting strip (5) are respectively provided with the first detection port (23) and the second detection port (24). There are two pressure reducing devices (4). The inside of the flowmeter base (1) is divided into a normal part and a non-normal part by the two pressure reducing devices (4). Pressure reduction section; there are two connecting sleeves (2) and two connecting strips (5), and the two connecting sleeves (2) and two connecting strips (5) are symmetrically arranged. The two connecting strips (5) are respectively connected to the two pressure reduction devices (4). The two pressure reduction devices (4) are divided into a gas phase device and a liquid phase device. The gas phase device is located above the liquid phase device. The two ends of the connecting strip (5) connected to the liquid phase device are provided with drainage devices (7). The drainage devices (7) are located outside the two pressure sensors (3) of the liquid phase device.The drainage device (7) includes a cover plate (71), a main fin (72), and two auxiliary fins (73). The main fin (72) and the auxiliary fins (73) have teardrop-shaped cross-sections with one end curved and the other end conical. The cover plate (71) is triangular. The main fin (72) and the auxiliary fins (73) are both disposed on the cover plate (71). The cover plate (71) is connected to the liquid phase device via the main fin (72) and the auxiliary fins (73). The curved ends of the main fin (72) and the auxiliary fins (73) are... The surface is provided with diversion protrusions (731). The main fin (72) is located on the center line of the cover plate (71). The two auxiliary fins (73) are located on both sides of the main fin (72). The cover plate (71) is provided with air grooves (74) and diversion grooves (75). The air grooves (74) are located on the same side as the main fin (72) and are located between the main fin (72) and the auxiliary fins (73). The diversion grooves (75) are located on the opposite side of the main fin (72) and on the side of the cover plate (71).

2. The multiphase fluid flow meter according to claim 1, characterized in that, The pressure reducing device (4) includes a pressure reducing channel (41) and a normal channel (42); the pressure reducing channel (41) and the normal channel (42) have the same structure, and both the pressure reducing channel (41) and the normal channel (42) are set on the inner wall of the flow meter base (1), and the setting directions of the pressure reducing channel (41) and the normal channel (42) are opposite.

3. The multiphase fluid flow meter according to claim 2, characterized in that, The step-down channel (41) includes a first channel (411), a second channel (412), a third channel (413), and a fourth channel (414); the first channel (411) and the fourth channel (414) are connected in a straight line and pass through both ends of the step-down channel (41); the second channel (412) is located on the same side as the first channel (411) and is arranged in parallel; the second channel (412) is connected to the fourth channel (414) through the third channel (413); the angle between the third channel (413) and the fourth channel (414) is an acute angle.

4. The multiphase fluid flow meter according to claim 1, characterized in that, The gas phase device is provided with sieve tubes (6) at both ends, and the connecting strip (5) connected to the gas phase device is located inside the sieve tubes (6).

5. The multiphase fluid flow meter according to claim 4, characterized in that, One end of the sieve tube (6) is connected to the end of the gas phase device, and the other end is a closed port. Several air holes are arranged closely at the bottom of the sieve tube (6), and the diameter of the air holes is no greater than 0.5 mm. The inner bottom of the sieve tube (6) is covered with a pad (61), which is made of a breathable but waterproof material. The pressure sensors (3) at both ends of the gas phase device are located above the pad (61).

6. The measurement method of the multiphase fluid flow meter according to any one of claims 1-5, characterized in that, step include: S1: The pressure sensor (3) of the first detection port (23) detects and records the pressure value of the fluid; S2: The fluid enters from one end of the pressure reducing device (4), and is discharged from the other end after being depressurized by the pressure reducing device (4); S3: The depressurized fluid passes through the pressure sensor (3) of the second detection port (24) to detect and record the pressure value; S4: The terminal compares the pressure values ​​before and after the pressure drop, and calculates the current flow rate value through the relationship between the pressure difference and the flow rate.

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