High-pressure flow meter

Abstract

The invention discloses a high-pressure flow meter, which relates to the technical field of flow detection, and comprises a liquid inlet connecting piece, a liquid inlet shrinkage pipe, a metering pipe, a liquid outlet expansion pipe and a liquid outlet connecting piece which are fixedly connected and communicated in sequence along a first direction, the inner diameter of an inlet of the liquid inlet connecting piece is consistent with the inner diameter of an outlet of a pipeline to be detected, the liquid outlet connecting piece is used for being connected and communicated with the inlet of the pipeline to be detected, the inner diameter of an inlet of the liquid outlet connecting piece is consistent with the inner diameter of the inlet of the pipeline to be detected, and the inner diameter of the liquid inlet shrinkage pipe is gradually shrunk in the first direction; the inner diameter of the liquid outlet expansion pipe is gradually expanded in the first direction, and the liquid inlet shrinkage pipe, the metering pipe and the liquid outlet expansion pipe are integrally formed. According to the high-pressure flow meter, the overall length of a pipeline can be reduced to a certain extent, the number of welding seams is reduced, and the leakage risk is reduced.

Description

Technical Field

[0001] This invention relates to the field of flow detection technology, and in particular to a high-pressure flow meter. Background Technology

[0002] In the engineering design and installation of flow meters, measurement accuracy is one of the core technical indicators. To ensure that the flow meter can accurately capture key parameters such as fluid velocity and flow rate, the industry generally adopts a design approach of reduced diameter installation, where the nominal diameter of the flow meter is usually one to two sizes smaller than the nominal diameter of the fluid pipeline. Such cases of reduced diameter matching are very common in practical applications. For example, when the nominal diameter of the main fluid pipeline is DN40, the nominal diameter of the selected flow meter is usually DN25. To achieve a smooth connection between two pipelines of different diameters, a reducer is needed as a transition component between the flow meter and the main pipeline. This ensures stable fluid flow within the pipeline and avoids eddies and turbulence caused by sudden changes in pipe diameter, which could affect the flow meter's measurement accuracy. However, high-pressure pipelines, due to high welding stress, generally require the welded pipe length to be greater than five times the nominal diameter and not less than 150mm, resulting in an excessively long pipeline structure. The excessive number of welds also increases the risk of leakage. Therefore, a high-pressure flow meter is urgently needed to solve the aforementioned technical problems. Summary of the Invention

[0003] The purpose of this invention is to provide a high-pressure flow meter to solve the problems existing in the prior art, which can reduce the overall length of the pipeline to a certain extent, reduce the number of welds, and reduce the risk of leakage.

[0004] To achieve the above objectives, the present invention provides the following solution: This invention provides a high-pressure flow meter, comprising an inlet connector, an inlet constriction tube, a metering tube, an outlet expansion tube, and an outlet connector that are sequentially fixedly connected and communicated along a first direction. The inlet connector is used to connect and communicate with the outlet of a pipe to be tested, and the inlet inner diameter of the inlet connector is the same as the outlet inner diameter of the pipe to be tested. The outlet connector is used to connect and communicate with the inlet of the pipe to be tested, and the inlet inner diameter of the outlet connector is the same as the inlet inner diameter of the pipe to be tested. The inlet constriction tube gradually contracts along the first direction, and the outlet expansion tube gradually expands along the first direction. The inlet constriction tube, the metering tube, and the outlet expansion tube are integrally formed.

[0005] In some embodiments, an excitation coil is provided inside the metering tube, and the excitation coil is symmetrically wound around both sides of the pipe inside the metering tube for detecting flow rate.

[0006] In some embodiments, an annular countersunk hole is formed on the inner wall of the liquid inlet constriction tube along a first direction, and an annular capsule is fixedly disposed in the annular countersunk hole, the annular capsule being filled with inert gas.

[0007] In some embodiments, a laminar flow assembly is also included, which is disposed at the connection end between the metering tube and the liquid inlet contraction tube, and is used to convert the liquid from a turbulent state to a laminar flow state.

[0008] In some embodiments, the laminar flow assembly includes an outer tube and a plurality of laminar flow plates, the laminar flow plates being fixedly disposed inside the outer tube and distributed along the height direction, the outer tube being fixedly disposed at the end of the metering tube near the liquid inlet contraction tube.

[0009] In some embodiments, the end of the metering tube near the liquid inlet shrink tube is a stepped hole and the larger end is fixedly connected to the liquid inlet shrink tube. The outer tube is fixedly disposed inside the larger end, and the inner diameter of the outer tube is the same as the inner diameter of the pipe inside the metering tube. The thickness of the wall surface of the stepped hole is the same as the thickness of the outer tube.

[0010] In some embodiments, each laminar flow plate includes a plurality of longitudinal strips and a plurality of transverse strips, the longitudinal strips and transverse strips being arranged intersecting to form a mesh structure, and the laminar flow plate being laid flat inside the outer tube.

[0011] In some embodiments, the laminar flow plate has a V-shaped tip at the end near the inlet constriction tube, and the tip is closer to the inlet constriction tube.

[0012] In some embodiments, the metering tube is also equipped with a signal transmitter, which is used to receive and output flow signals.

[0013] In some embodiments, the inlet connector is an inlet flange, the outlet connector is an outlet flange, and the inlet flange, the inlet shrink tube, the metering tube, the outlet expansion tube, and the outlet flange are integrally formed.

[0014] The present invention achieves the following technical effects compared to the prior art: The high-pressure flow meter provided by this invention integrates a small-diameter metering tube, a large-diameter inlet contraction tube, and an outlet expansion tube into a single structure. Through the transition between the inlet contraction tube and the outlet expansion tube, the number of components and welds in the process pipeline is reduced, the structural length of the process pipeline is shortened, installation workload and leakage risk are reduced, and safety is improved without affecting metering accuracy. The inner diameters of the inlet and outlet connectors are consistent with the inlet and outlet inner diameters of the pipeline to be tested, achieving a stepless connection between the flow meter and the process pipeline. This avoids flow field disturbances such as turbulence and eddies caused by sudden changes in pipe diameter, ensuring smooth fluid entry into the metering tube and reducing pressure loss at the interface, thus meeting the low-energy consumption operation requirements under high-pressure conditions. The inlet contraction tube gradually narrows along the fluid direction, uniformly accelerating the fluid and allowing it to enter the metering tube at a stable velocity and in a laminar flow state. The outlet expansion tube gradually expands along the fluid direction, smoothly decelerating the fluid and avoiding metering errors caused by sudden changes in flow velocity. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram illustrating the use of a DN25 high-pressure flow meter for a DN40 pipeline as described in the background section of this invention. Figure 2 This is a cross-sectional view of a high-pressure flow meter in some embodiments of the present invention; Figure 3 for Figure 2 Enlarged view of point A in the middle; Figure 4 This is a schematic diagram of the connection between the liquid inlet shrink tube and the metering tube in some embodiments of the present invention; Figure 5 This is a three-dimensional structural diagram of a high-pressure flow meter in some embodiments of the present invention.

[0017] In the diagram: 1-Metering tube; 2-Inlet connector; 3-Outlet connector; 4-Inlet constriction tube; 401-Annular countersunk hole; 402-Stepped hole; 5-Excitation coil; 6-Signal transmitter; 7-Annular capsule; 8-Laminar flow assembly; 801-Laminar flow plate; 802-Outer tube; 803-V-tip; 9-Outlet expansion tube. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] The purpose of this invention is to provide a high-pressure flow meter to solve the problems existing in the prior art, which can reduce the overall length of the pipeline to a certain extent, reduce the number of welds, and reduce the risk of leakage.

[0020] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] like Figures 2-5 As shown, this invention provides a high-pressure flow meter, comprising an inlet connector 2, an inlet contraction tube 4, a metering tube 1, an outlet expansion tube 9, and an outlet connector 3, which are sequentially fixed and connected along a first direction. The inlet connector 2 is used to connect and communicate with the outlet of the pipeline to be tested, and the inner diameter of the inlet of the inlet connector 2 is consistent with the inner diameter of the outlet of the pipeline to be tested. The outlet connector 3 is used to connect and communicate with the inlet of the pipeline to be tested, and the inner diameter of the inlet of the outlet connector 3 is consistent with the inner diameter of the inlet of the pipeline to be tested. The inner diameter of the inlet contraction tube 4 gradually contracts along the first direction, and the inner diameter of the outlet expansion tube 9 gradually expands along the first direction. The inlet contraction tube 4, the metering tube 1, and the outlet expansion tube 9 are integrally formed. By making the small-sized metering tube 1 and the large-sized inlet contraction tube 4 and outlet expansion tube 9 into an integral structure, and using the inlet contraction tube 4 and outlet expansion tube 9 as a transition, the number of components and welds in the process pipeline is reduced without affecting the accuracy of measurement, the structural length of the process pipeline is reduced, the installation workload and leakage risk are reduced, and safety is improved. The inner diameters of the inlet connector 2 and the outlet connector 3 are consistent with the inlet and outlet inner diameters of the pipeline to be tested, respectively, achieving a stepless connection between the flow meter and the process pipeline. This avoids flow field disturbances such as turbulence and eddies caused by sudden changes in pipe diameter, ensuring that the fluid enters the metering tube 1 smoothly and reducing pressure loss at the interface, thus meeting the low-energy consumption requirements under high-pressure conditions. The inlet contraction tube 4 gradually contracts along the fluid direction, which can uniformly accelerate the fluid, allowing it to enter the metering tube 1 at a stable velocity and in a laminar flow state. The outlet expansion tube 9 gradually expands along the fluid direction, which can smoothly decelerate the fluid and avoid measurement errors caused by sudden changes in flow velocity.

[0022] In a preferred embodiment, the inner walls of both the inlet contraction tube 4 and the outlet expansion tube 9 are frustoconical. The inner diameter of the frustoconical inner wall gradually changes linearly along the fluid direction. The inlet contraction tube 4 guides the fluid to accelerate smoothly, while the outlet expansion tube 9 guides the fluid to decelerate smoothly. Compared to other transitional structures such as stepped or arc-shaped structures, the frustoconical inner wall avoids flow field disturbances such as eddies and turbulence caused by abrupt changes in pipe diameter, ensuring that the fluid entering the metering tube 1 is in a stable laminar flow state. The smooth, gradual structure of the frustoconical inner wall significantly reduces frictional resistance and local resistance during fluid flow. For high-pressure transmission systems, lower pressure loss means lower energy consumption, while avoiding problems such as medium vaporization and cavitation caused by excessive pressure drop, thus adapting to the metering requirements of high-pressure, high-viscosity media.

[0023] In some embodiments, an excitation coil 5 is disposed inside the metering tube 1, and the excitation coil 5 is symmetrically wound around both sides of the pipe inside the metering tube 1 for detecting flow rate. The excitation coil 5 is symmetrically wound around both sides of the metering tube 1, which can form an axially uniform and radially symmetrical magnetic field region inside the metering tube 1. Under high pressure conditions, fluids are prone to unstable flow states such as turbulence and velocity stratification. A uniform magnetic field can ensure that when the conductive medium at any position in the fluid cuts the magnetic field lines, the induced electromotive force generated has a precise linear relationship with the flow velocity, avoiding edge errors caused by unilateral excitation.

[0024] In some embodiments, an annular countersunk hole 401 is formed on the inner wall of the inlet constriction tube 4 along the first direction. An annular capsule 7 is fixedly disposed inside the annular countersunk hole 401 and filled with inert gas. The gas pressure inside the annular capsule 7 can be slightly lower than the design pressure. When the pipeline valve is opened or closed, the fluid velocity will fluctuate violently, which can easily form transient disturbances such as turbulence and water hammer at the front end of the metering tube 1. The annular capsule 7 filled with inert gas can absorb this velocity impact through its own elastic deformation, avoiding the disturbance from being directly transmitted to the stable flow field inside the metering tube 1. This can effectively eliminate the metering deviation caused by transient velocity fluctuations, ensure the metering accuracy of the flow meter under non-steady-state conditions such as start-up, shutdown, and load changes, and make up for the defect that traditional high-pressure flow meters are only suitable for steady-state metering. The internal pressure of the annular capsule 7 is slightly lower than the design pressure. When the flow velocity inside the tube suddenly increases, the capsule contracts under the pressure of the fluid, allowing for fine adjustment of the flow channel cross-section of the liquid inlet contraction tube 4. When the flow velocity suddenly decreases, the capsule elastically resets, and the flow channel cross-section returns to its original shape. This dynamic adjustment ensures that the fluid entering the metering tube 1 remains in a stable laminar flow state, providing a stable flow field basis for the accurate detection of the symmetrical excitation coil 5 and improving the repeatability and consistency of the metering data. The capsule is filled with inert gas to prevent chemical reactions between the gas and the high-pressure medium, and to prevent oxidation and aging inside the capsule. The stability of the inert gas ensures that the elastic performance of the capsule does not decay under long-term high-pressure and temperature fluctuation conditions, extending its service life and reducing the frequency of maintenance and replacement.

[0025] Nitrogen is the preferred inert gas. Nitrogen is readily available and inexpensive. Compared to rare inert gases such as helium and argon, using nitrogen significantly reduces the production cost of the flow meter, as well as the maintenance costs associated with replenishing and replacing the capsule. Furthermore, nitrogen does not negatively affect the elastic material of the annular capsule 7, such as causing swelling or aging, effectively extending the capsule's lifespan. Even in the event of capsule rupture and leakage, nitrogen will not contaminate the medium or cause safety accidents, making it suitable for high-pressure applications involving flammable, explosive, or toxic media in industries such as petroleum and chemical processing.

[0026] In a preferred embodiment, the left end face of the annular capsule 7 (the end closest to the inlet connector 2) is flush with the frustum-shaped annular surface of the inlet contraction tube 4, without protruding from it. Furthermore, the end face of the annular capsule 7 matches the shape of the inner wall of the inlet contraction tube 4, meaning the inner wall of the left end of the annular capsule 7 is also frustum-shaped. The fact that the left end face of the annular capsule 7 is flush with the frustum-shaped annular surface of the inlet contraction tube 4 and does not protrude from the inner wall completely avoids abrupt changes in the flow channel caused by the annular capsule 7's protrusion. When the high-pressure fluid flows through this area, it can smoothly transition along the frustum-shaped inner wall, preventing eddies, turbulence, and other flow field disturbances caused by the protrusion. This ensures that the fluid entering the metering tube 1 maintains a stable laminar flow state, solving the problem of decreased metering accuracy caused by protruding flow channels in traditional buffer components, and achieving dual protection of buffering function and metering accuracy. The frustum-shaped inner wall of the left end of the annular capsule 7 perfectly matches the shape of the inner wall of the inlet contraction tube 4, forming a continuous, stepless, gradually changing flow channel. The acceleration process of the fluid within the inlet contraction tube 4 is more uniform, preventing localized resistance losses caused by the mismatch in the inner wall shape of the annular capsule 7, thus reducing the energy consumption of the high-pressure delivery system. The continuous frustum-shaped flow channel also reduces the accumulation of impurities in the medium, lowering the risk of scaling and clogging. The perfect match between the frustum-shaped shape of the annular capsule 7 and the inner wall of the inlet contraction tube 4 increases the contact area between the two, improving the installation stability of the annular capsule 7 within the annular countersunk hole 401. During high-pressure fluid impact, the annular capsule 7 experiences more uniform stress, preventing displacement and deformation due to localized stress concentration, thus extending its service life. The fitted design also reduces gaps between the annular capsule 7 and the tube wall, preventing media seepage into these gaps and accelerating the aging of the annular capsule 7.

[0027] More specifically, the annular capsule 7 is adhered to the annular countersunk hole 401 using waterproof adhesive. The waterproof adhesive fills all gaps between the annular capsule 7 and the annular countersunk hole 401, forming a seamless sealing layer. Under high-pressure conditions, this sealing structure effectively prevents media from seeping into the contact surface between the capsule and the countersunk hole, avoiding media erosion of the adhesive layer and causing the capsule to detach. Compared to mechanical fixing methods such as clips and bolts, waterproof adhesive bonding offers superior sealing performance and is suitable for applications involving flammable, explosive, or corrosive high-pressure media. Adhesive bonding eliminates the need for bolt holes, clip grooves, or other structures on the frustum-shaped inner wall of the inlet constriction tube 4 or at the annular countersunk hole 401, thus preserving the streamlined flow channel of the constriction tube and avoiding new stress concentration points. It works synergistically with the integrated molding structure of the inlet constriction tube 4, metering tube 1, and outlet expansion tube 9 to ensure overall pressure resistance.

[0028] In some embodiments, the high-pressure flow meter further includes a laminar flow component 8, which is disposed at the connection end between the metering tube 1 and the inlet constriction tube 4. The laminar flow component 8 is used to convert the liquid from a turbulent state to a laminar state. The laminar flow component 8, disposed at the connection end between the metering tube 1 and the inlet constriction tube 4, can perform secondary flow field regulation on the fluid accelerated by the constriction tube. Fluid transported in high-pressure pipelines is easily affected by valve opening and closing, bends, and other pipe fittings, resulting in turbulence. The laminar flow component 8 can transform the turbulent fluid into a stable laminar state through guiding and rectifying actions. This solves the problem of turbulence that cannot be completely eliminated by the gradual change structure of the constriction tube alone, ensuring that the fluid entering the metering tube 1 has a uniform flow velocity and parallel streamlines. The annular capsule 7 absorbs the impact of sudden velocity changes, while the laminar flow component 8 performs fine rectification of the buffered fluid. Together, they form a dual guarantee of impact buffering and flow regulation, covering the flow field requirements of all operating conditions, including high-pressure pipeline start-up and shutdown, variable load, and steady-state operation, avoiding the shortcomings of a single structure in flow field control under extreme conditions. The accurate metering of the symmetrical excitation coil 5 relies on a uniform and stable flow field. Under laminar flow conditions, the fluid cuts the magnetic field lines at a consistent speed, and the induced electromotive force has a strictly linear relationship with the flow rate. Compared to the nonlinear error under turbulent flow conditions, the laminar flow component 8 can significantly improve the repeatability and accuracy of metering, making it suitable for accurate metering scenarios involving high-pressure, low-flow, and high-viscosity media.

[0029] In some embodiments, the laminar flow assembly 8 includes an outer pipe 802 and multiple laminar flow plates 801. The laminar flow plates 801 are fixedly disposed inside the outer pipe 802, preferably welded together, and distributed along the height direction. The outer pipe 802 is fixedly disposed at the end of the metering pipe 1 near the inlet contraction pipe 4. The multiple laminar flow plates 801 are distributed along the height direction of the outer pipe 802, which can perform staged flow guidance of the fluid. When the high-pressure fluid flows through the first laminar flow plate 801, the large-scale eddies are cut and broken up; when it flows through subsequent laminar flow plates 801, the small-scale turbulence is further regulated, and finally transformed into a stable laminar flow state. Compared with a single laminar flow plate 801 structure, the multi-layer design has a more thorough rectification effect, can adapt to more complex turbulent morphologies under high-pressure conditions, and ensures the uniformity of the flow field entering the metering pipe 1. The outer tube 802 serves as the mounting carrier for the laminar flow plate 801. All laminar flow plates 801 can be fixed, assembled, and calibrated before leaving the factory. During on-site installation, the outer tube 802 only needs to be connected to the connection end between the metering tube 1 and the liquid inlet shrink tube 4. There is no need to adjust the position of each laminar flow plate 801 individually, which greatly reduces the assembly difficulty and error.

[0030] In some embodiments, the end of the metering tube 1 near the inlet contraction tube 4 has a stepped hole 402, and the larger end is fixedly connected to the inlet contraction tube 4. The outer tube 802 is fixedly disposed inside the larger end, preferably welded, and the inner diameter of the outer tube 802 is the same as the inner diameter of the inner pipe of the metering tube 1, and the thickness of the wall of the stepped hole 402 is the same as the thickness of the outer tube 802. Since the inner diameter of the outer tube 802 is exactly the same as the inner diameter of the inner pipe of the metering tube 1, after the fluid is rectified by the laminar flow assembly 8, it can smoothly enter the metering tube 1 along a constant diameter flow channel, avoiding local eddies and sudden velocity changes caused by channel narrowing or widening, ensuring that the laminar flow state is not disrupted, and providing a continuous and stable detection flow field for the symmetrical excitation coil 5. The wall thickness of the stepped hole 402 precisely matches the thickness of the outer tube 802, making the inner wall of the outer tube 802 and the inner wall of the metering tube 1 form a continuous, stepless, smooth surface, eliminating flow channel protrusions or depressions caused by thickness differences, avoiding fluid stagnation and turbulence at the connection point, and further improving the repeatability of metering accuracy. The stepped hole 402 at the end of the metering tube 1 can be used as a positioning stop for the installation of the outer tube 802. When the outer tube 802 is embedded in the large end, axial and radial positioning can be quickly achieved through the stepped hole 402, reducing the difficulty of assembly calibration, avoiding the flow field offset problem caused by the misalignment of the outer tube 802, and ensuring that the rectification direction of the laminar flow component 8 is completely consistent with the axis of the metering tube 1.

[0031] In some embodiments, each laminar flow plate 801 includes multiple longitudinal strips and multiple transverse strips, which are arranged in a cross pattern to form a mesh structure. The mesh size can be set according to specific needs. The laminar flow plate 801 is laid flat inside the outer tube 802. The mesh structure formed by the cross pattern of longitudinal and transverse strips can cut large-scale eddies in high-pressure fluid into small eddies, which are then rectified step by step by multiple mesh laminar flow plates 801 and finally transformed into stable laminar flow. Compared with a single-direction guide plate, the mesh structure can simultaneously constrain the axial and radial flow of the fluid, eliminate velocity gradients, and ensure that the fluid streamlines entering the metering tube 1 are parallel and the flow velocity is uniform. When the fluid flows through the mesh, it will generate moderate damping, which can further attenuate the velocity pulsation caused by valve opening and closing and pressure fluctuations. This works in conjunction with the annular capsule 7 in the inlet contraction tube 4 to doubly buffer flow field disturbances and ensure the metering stability of the flow meter under non-steady-state conditions. The mesh size can be designed specifically for the viscosity and flow range of the medium. For media with high viscosity and low flow, a small mesh can be used to enhance the rectification effect; for media with low viscosity and high flow, a large mesh can be used to reduce pressure loss.

[0032] In some embodiments, the laminar flow plate 801 has a V-shaped tip 803 at its end near the inlet contraction pipe 4, with the tip closer to the inlet contraction pipe 4. The V-shaped tip 803 at the end of the laminar flow plate 801 near the inlet contraction pipe 4, with the tip facing the incoming flow direction, can actively divert the high-pressure fluid. When the fluid impacts the V-shaped tip 803, it is divided into multiple streams flowing along the inclined surface of the tip, directly breaking up the large-scale eddies that easily form under high-pressure conditions, reducing the rectification load on the subsequent mesh structure. Compared to a laminar flow plate 801 with a flat end face, the pre-diversion effect of the V-shaped tip 803 can improve the efficiency of converting turbulent flow into laminar flow, ensuring a more stable flow field entering the metering pipe 1.

[0033] In some embodiments, a signal transmitter 6 is also provided on the metering tube 1. The signal transmitter 6 is used to receive and output flow signals. The signal transmitter 6 is directly installed on the metering tube 1, which can receive the flow sensing signal generated by the symmetrical excitation coil 5 at close range, shortening the signal transmission path, avoiding signal attenuation and external electromagnetic interference caused by long-distance wiring, and improving the signal-to-noise ratio. The signal transmitter 6 can perform real-time filtering, amplification, linearization calibration, and other processing on the acquired raw signal. For signal fluctuations under conditions such as high-pressure pipeline start-up and shutdown and load changes, the signal transmitter 6 can quickly respond and correct the data, ensuring the stability and continuity of the output flow value.

[0034] In some embodiments, the inlet connector 2 is an inlet flange, and the outlet connector 3 is an outlet flange. The inlet flange, inlet contraction tube 4, metering tube 1, outlet expansion tube 9, and outlet flange are integrally formed. This integral molding completely eliminates the need for welding or flange connections between components. In high-pressure fluid transport scenarios, welds and flange connections are high-risk areas for pressure failure. This design directly eliminates these risks, significantly improving the overall pressure resistance and structural stability of the flowmeter. The integrated structure ensures that fluid pressure is evenly distributed throughout the flowmeter body, preventing the formation of localized high-pressure zones at connection points. This effectively resists alternating loads and vibration impacts from high-pressure pipelines, reducing the risk of structural fatigue during long-term operation.

[0035] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A high-pressure flow meter, characterized in that: The device includes an inlet connector, an inlet shrink tube, a metering tube, an outlet expansion tube, and an outlet connector, which are sequentially fixed and connected along a first direction. The inlet connector is used to connect and communicate with the outlet of the pipe to be tested, and the inner diameter of the inlet connector is the same as the inner diameter of the outlet of the pipe to be tested. The outlet connector is used to connect and communicate with the inlet of the pipe to be tested, and the inner diameter of the inlet connector is the same as the inner diameter of the inlet of the pipe to be tested. The inlet shrink tube gradually shrinks along the first direction, and the outlet expansion tube gradually expands along the first direction. The inlet shrink tube, the metering tube, and the outlet expansion tube are integrally formed.

2. The high-pressure flow meter according to claim 1, characterized in that: An excitation coil is installed inside the metering tube, and the excitation coil is symmetrically wound on both sides of the pipe inside the metering tube for detecting flow rate.

3. The high-pressure flow meter according to claim 1, characterized in that: An annular countersunk hole is formed on the inner wall of the liquid inlet constriction tube along the first direction. An annular capsule is fixedly installed in the annular countersunk hole and filled with inert gas.

4. The high-pressure flow meter according to claim 1, characterized in that: It also includes a laminar flow assembly, which is disposed at the connection end between the metering tube and the liquid inlet contraction tube. The laminar flow assembly is used to convert the liquid from a turbulent state to a laminar flow state.

5. The high-pressure flow meter according to claim 4, characterized in that: The laminar flow assembly includes an outer tube and multiple laminar flow plates. The laminar flow plates are fixedly disposed inside the outer tube and distributed along the height direction. The outer tube is fixedly disposed at the end of the metering tube near the liquid inlet contraction tube.

6. The high-pressure flow meter according to claim 5, characterized in that: The metering tube has a stepped hole at the end near the liquid inlet shrink tube, and the larger end is fixedly connected to the liquid inlet shrink tube. The outer tube is fixedly installed inside the larger end, and the inner diameter of the outer tube is the same as the inner diameter of the pipe inside the metering tube. The thickness of the stepped hole wall is the same as the thickness of the outer tube.

7. The high-pressure flow meter according to claim 5, characterized in that: Each laminar flow plate includes multiple vertical strips and multiple horizontal strips, which are arranged in a cross pattern to form a mesh structure. The laminar flow plate is laid flat inside the outer tube.

8. The high-pressure flow meter according to claim 5, characterized in that: The laminar flow plate has a V-shaped tip at the end near the liquid inlet shrink tube, and the tip is closer to the liquid inlet shrink tube.

9. The high-pressure flow meter according to claim 1, characterized in that: The metering tube is also equipped with a signal transmitter, which is used to receive and output flow signals.

10. The high-pressure flow meter according to claim 1, characterized in that: The inlet connector is an inlet flange, the outlet connector is an outlet flange, and the inlet flange, the inlet shrink tube, the metering tube, the outlet expansion tube, and the outlet flange are integrally formed.

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