Multi-condition replaceable throttling element differential pressure flowmeter

Abstract

This invention discloses a multi-condition replaceable throttling element differential pressure flowmeter, relating to the field of differential pressure flow measurement technology. The multi-condition replaceable throttling element differential pressure flowmeter includes a measuring tube body and a throttling cylinder assembly. The measuring tube body has an axially extending mounting cavity in its middle. The mounting cavity includes two symmetrically separated tubes at opposite ends, with the measuring tube body fixed to one end of each tube, and the throttling cylinder assembly mounted on the other end. The throttling cylinder assembly includes an outer cylinder and an inner cylinder. The tubes, corresponding to the outer cylinder, sequentially have an inlet section, a centering cone section, a mounting straight cylinder section, and a positioning platform stage. The mounting straight cylinder section integrates a ring chamber pressure equalization and tapping structure. A full-circle pressure equalization groove is formed at the pressure tapping position on the outer wall of the inner cylinder, corresponding to the ring chamber pressure equalization and tapping structure. The use of a full-circle ring chamber pressure equalization and tapping structure in conjunction with the full-circle pressure equalization groove at the pressure tapping position on the outer wall of the inner cylinder achieves high-precision, high-stability measurement and improves anti-interference capabilities.

Description

Technical Field

[0001] This invention relates to the field of differential pressure flow measurement technology, specifically to a differential pressure flow meter with a multi-condition replaceable throttling element. Background Technology

[0002] Differential pressure flow meters are among the most widely used flow measurement devices in the industrial field. They are extensively used in process industries such as petrochemicals, power, metallurgy, water treatment, and heating networks. They are mainly based on Bernoulli's principle and the fluid continuity equation for flow measurement: when fluid flows through a throttling element in a closed pipe, the flow cross-section contracts locally, the fluid velocity increases, and the static pressure decreases accordingly. A stable static pressure difference is formed between the upstream and downstream of the throttling element. The square root of this differential pressure value has a corresponding functional relationship with the volumetric flow rate of the fluid in the pipe. By collecting the differential pressure signals from the upstream and downstream and combining them with the fluid medium parameters, the real-time flow rate of the medium inside the pipe can be obtained.

[0003] Traditional differential pressure flowmeters typically employ an integrated, fixed welded or bolted assembly structure for the throttling element and measuring tube body. The throttling element's installation position is not adjustable and cannot be quickly replaced on-site. The throttling element parameters and orifice ratio of a single flowmeter are factory-preset, only suitable for specific media, specific flow ranges, and fixed process conditions. Once on-site adjustments occur, such as changes in production processes, media composition, significant fluctuations in flow range, or changes in media temperature and pressure conditions, the original throttling element no longer meets the metering requirements. In most cases, the entire flowmeter must be removed and replaced with a brand new one. This approach not only results in high equipment procurement costs but also requires shutting off the pipeline medium, depressurizing, and disassembling pipe flanges, causing prolonged downtime and significant production losses for continuous industrial plants. Furthermore, on-site pipeline disassembly and reassembly involve welding and re-pressure testing, making the overall modification project substantial.

[0004] To address the shortcomings of traditional integrated differential pressure flowmeters, such as poor adaptability and high retrofit costs, the industry has developed differential pressure flowmeters with replaceable throttling elements. These throttling elements are designed as detachable components, allowing replacement without disassembling the entire flowmeter. However, currently available and practically applied differential pressure flowmeters with replaceable throttling elements generally employ a single-hole point-to-point pressure tapping mode. This means that individual pressure taps are made on both the measuring tube and the throttling element cylinder, relying on manual alignment during assembly to collect pressure. After repeated disassembly and replacement, the throttling element inevitably experiences slight axial movement and circumferential angular offset, which can easily cause misalignment of the two sets of pressure taps, altering the actual effective pressure tapping flow area. This directly leads to drift in the acquired differential pressure signal, significantly degrading the repeatability of the flowmeter measurement. Furthermore, most throttling elements are installed using a simple clearance fit, lacking a reliable centering and limiting structure. After the throttling element is installed in the pipe, coaxiality is difficult to guarantee, and excessive coaxiality deviation directly worsens the flowmeter's measurement accuracy. After repeated disassembly and reassembly, wear will occur at the mating points, resulting in significant accuracy drift.

[0005] Therefore, in view of the shortcomings of the existing technology, there is an urgent need to develop a differential pressure flow meter with replaceable throttling components that has high assembly and positioning accuracy, stable pressure tapping and anti-interference, convenient disassembly and assembly operation, and can be adapted to a variety of complex process conditions. Summary of the Invention

[0006] The purpose of this invention is to provide a multi-condition replaceable throttling element differential pressure flow meter to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a multi-condition replaceable throttling element differential pressure flow meter, comprising a measuring tube body and a throttling cylinder assembly replaceably assembled in the middle of the measuring tube body; The measuring tube body has connecting flanges at both ends for connecting to process pipelines, and an axially extending mounting cavity in the middle of the measuring tube body; The mounting cavity includes two symmetrically separated tubes at both ends. The opposite ends of the tubes are fixed to the main body of the measuring tube, and the opposite ends of the tubes are equipped with a throttle cylinder assembly. The throttle cylinder assembly includes an outer cylinder and an inner cylinder with two symmetrically separated ends. The outer cylinder is located between the two tubes, and a quick-release locking mechanism is provided between the outer cylinder and the tubes. The inner cylinder is inserted into the outer cylinder in an axially slidable manner. A standardized throttling element is integrated between the two inner cylinders; The cavity tube is provided with an inlet section, a centering cone section, an installation straight cylinder section, and a positioning platform stage in sequence corresponding to the direction of the outer cylinder. The inner cylinder is provided with a conical surface that matches the centering conical section of the cavity tube. After the inner cylinder is inserted into the cavity tube, radial centering is achieved through the engagement of the conical surface. The cavity tube is installed with a straight cylindrical section integrating an annular chamber pressure equalization and tapping structure; the pressure tapping position on the outer wall of the inner cylinder is provided with a full circle of pressure equalization grooves, and the pressure equalization grooves correspond to the annular chamber pressure equalization and tapping structure; The quick-release locking mechanism includes a fixed assembly piece installed on the cavity tube mating surface and a movable assembly piece installed on the outer cylinder mating surface. The fixed assembly piece is evenly and equidistantly fitted with elastic pins; the elastic pins are used to engage with the pin holes on the movable assembly piece to achieve initial positioning; Locking rods are screwed onto the moving assembly piece at equal and even intervals; the locking rods pass through the elastic pins and are screwed onto the fixed assembly piece to achieve complete locking.

[0008] As a preferred embodiment of the present invention, axially extending operating grooves are respectively provided on both sides of the outer cylinder wall; The inner cylinder has connecting rods fixedly connected to the two sides of the cylinder wall at opposite ends, corresponding to the operating slots. The ends of the connecting rods are fixedly connected to operating handles that can cover the outer ports of the operating slots; the operating handles on the same side are staggered. The throttling element and the inner cylinder are connected by a flexible cylinder that shields the inner port of the control slot.

[0009] As a preferred embodiment of the present invention, the annular chamber pressure equalization and tapping structure includes an annular pressure equalization cavity corresponding to the pressure equalization groove. The pressure equalization cavity is completely circumferentially connected along the inner wall of the cavity tube, and has a rectangular cross-section with rounded corners. The pressure equalization cavity has radial channels uniformly opened in the circumferential direction. One end of the radial channel is connected to the bottom of the pressure equalization cavity, and the other end converges to the external pressure tapping interface. A pressure tapping ring is fitted on the outer wall of the cavity corresponding to the pressure tapping interface. A pressure tapping valve with a series pressure tapping interface is fitted on the upper part of the pressure tapping ring, and a drain valve with a series pressure tapping interface is fitted on the lower part of the pressure tapping ring. The pressure tapping valves of the two mounting cavities are used to assemble the flow meter assembly.

[0010] As a preferred embodiment of the present invention, radial pressure tapping holes are uniformly opened at the bottom of the pressure equalization tank along the circumference, and the radial pressure tapping holes are inclined in the direction of the flow.

[0011] As a preferred embodiment of the present invention, the inner wall of the straight section of the cavity tube is provided with an eccentric guide groove; The outer wall of the inner cylinder is provided with a guide key that is adapted to the eccentric guide groove. The guide key and the eccentric guide groove cooperate to achieve circumferential anti-rotation. The end face of the positioning stage of the cavity tube is overlaid with hard alloy as an axial positioning reference for the inner cylinder.

[0012] As a preferred embodiment of the present invention, the end face of the inner cylinder is provided with a first sealing element that cooperates with the positioning stage of the cavity tube to form a main seal; the conical surface of the inner cylinder is provided with a second sealing element that cooperates with the centering conical section of the cavity tube to form an auxiliary seal, thus constituting a dual-stage redundant sealing system.

[0013] As a preferred embodiment of the present invention, the outer wall of the movable assembly piece is movably sleeved with a ring that engages with the end of the locking rod, and the ring is used to synchronously drive the locking rod; The two rings are connected by a common pin to form a self-locking mechanism.

[0014] As a preferred embodiment of the present invention, a retaining frame with a fitting ring is fixedly connected between the two fixed assembly pieces, and the retaining frame is located below the throttle cylinder assembly; The blocking frame is equipped with a locking block for locking the axial position of the operating handle after assembly.

[0015] Compared with the prior art, the beneficial effects of the present invention are: A multi-condition replaceable throttling element differential pressure flowmeter employs a full-circle annular chamber pressure equalization and tapping structure, combined with a full-circle pressure equalization groove on the pressure tapping position on the outer wall of the inner cylinder. This ensures that assembly errors do not affect the pressure tapping flow area and pressure acquisition effect. Combined with the radial centering of the inner cylinder's conical surface, the circumferential anti-rotation of the guide key and eccentric guide groove, and the axial limiting of the positioning platform end face of the cavity tube, a triple high-precision positioning assembly system is formed, improving the stability of measurement signal deviation after disassembly and assembly. Simultaneously, the annular chamber pressure equalization and tapping structure possesses an independent volumetric filtering effect, achieving high-precision and high-stability measurement and improving anti-interference capabilities.

[0016] A multi-condition replaceable throttling element differential pressure flow meter, by setting up an annular chamber pressure equalization and tapping structure, allows operators to quickly complete the disassembly and replacement of the throttling cylinder assembly, greatly improving the efficiency of operation and maintenance. At the same time, the annular chamber pressure equalization and tapping structure has no precision vulnerable parts, and has excellent overall wear resistance and deformation resistance. It can still maintain high-precision pressure tapping performance after multiple disassembly and assembly, significantly reducing manual operation and maintenance costs and greatly improving practicality and economy.

[0017] A multi-condition replaceable throttling differential pressure flow meter features a blocking frame that supports and mounts the throttling cylinder assembly, freeing up manual lifting. During assembly of the throttling cylinder assembly, the elastic pin and pin hole are used to achieve quick alignment and initial locking. Then, an external ring can synchronously drive the locking rod on the same side to complete the locking operation, simplifying the locking steps, significantly shortening the replacement and disassembly time of the throttling cylinder assembly, and significantly improving the efficiency of maintenance and replacement work.

[0018] A multi-condition replaceable throttling element differential pressure flow meter is disclosed. The throttling cylinder assembly is initially positioned by an elastic pin, and the locking rod is screwed through the elastic pin to the fixed assembly piece to achieve complete locking, forming a two-stage locking constraint to ensure stable flow meter measurement accuracy. In addition, the pins are simultaneously inserted into the two side rings to form a mechanical self-locking structure, which improves the safety and reliability of the equipment in long-term operation.

[0019] A multi-condition replaceable throttling differential pressure flow meter allows the inner cylinder to be retracted and stored inside the outer cylinder during replacement operations, while the outer cylinder is adapted to the reserved gap between the two mounting cavities. After the connection between the outer cylinder and the mounting cavity is disconnected, the outer cylinder can be pulled out directly without overcoming the obstruction caused by the precise fit between the inner cylinder and the mounting cavity, thereby simplifying the disassembly process, reducing the difficulty of on-site disassembly and assembly operations, and improving on-site maintainability.

[0020] A multi-condition replaceable throttling element differential pressure flow meter relies on the inner cylinder to block the mating gap between the mounting cavity and the outer cylinder, forming a physical barrier to the connection gap between the two, reducing the intrusion of the medium into the gap, assisting in achieving a sealing effect, and further improving the overall sealing reliability in conjunction with other sealing structures.

[0021] A multi-condition replaceable throttling element differential pressure flow meter, after the inner cylinder is pushed into place, the operating handle can cover and block the operating groove, further blocking the passage of the operating groove; then, the operating handle is limited and fixed by the locking block on the blocking frame, which can constrain the axial position of the inner cylinder, ensure that the inner cylinder is always kept in the working position, ensure the barrier sealing effect and the assembly accuracy of the throttling element, and improve the operation sealing and assembly stability.

[0022] A multi-condition replaceable throttling element differential pressure flow meter can be adapted to various differentiated industrial conditions, such as clean liquids and gases, dirty and high-viscosity media, high-temperature and high-pressure steam, insufficient straight pipe sections on site, and large flow and low pressure loss requirements, by quickly replacing the throttling cylinder assembly with different standardized throttling elements. This greatly improves the versatility of the flow meter equipment and its adaptability to changing field conditions. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the control slot of the present invention; Figure 3 This is a schematic diagram of the pin of the present invention; Figure 4 This is a schematic diagram of the throttle tube assembly of the present invention; Figure 5 This is a schematic diagram of the control handle of the present invention; Figure 6 For the present invention Figure 5 Enlarged view of point B; Figure 7This is a schematic diagram of the throttling element of the present invention; Figure 8 This is a schematic diagram of the assembly of the present invention; Figure 9 This is a schematic diagram of the cavity of the present invention; Figure 10 For the present invention Figure 9 Enlarged view of point A; Figure 11 This is a schematic diagram of the quick-release locking mechanism of the present invention; Figure 12 This is a schematic diagram showing the position of the locking block in this invention; Figure 13 This is a schematic diagram of the mounting cavity of the present invention; Figure 14 This is a schematic diagram of the drain valve of the present invention.

[0024] In the picture: 101. Measuring tube body; 102. Connecting flange; 103. Flow meter assembly; 2. Throttling cylinder assembly; 3. Mounting cavity; 301. Cavity tube; 302. Pressure equalizing cavity; 303. Radial channel; 304. Pressure tapping interface; 305. Pressure tapping ring; 306. Pressure tapping valve; 307. Drain valve; 308. Eccentric guide groove; 401. Outer cylinder; 402. Control slot; 501. Inner cylinder; 502. Pressure equalizing groove; 503. Connecting rod; 504. Operating handle; 505. Radial pressure tapping hole; 506. Guide key; 507. First sealing element; 508. Second sealing element; 601. Throttling element; 602. Flexible cylinder; 7. Quick-release locking mechanism; 701. Fixed assembly piece; 7011. Elastic pin; 702. Moving assembly piece; 7021. Pin hole; 7022. Locking rod; 7023. Ring; 7024. Insert pin; 703. Block; 7031. Locking block. Detailed Implementation

[0025] 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.

[0026] Example: Please refer to Figures 1-14 A multi-condition replaceable throttling element differential pressure flow meter includes a measuring tube body 101 and a throttling cylinder assembly 2 that can be replaced and assembled in the middle of the measuring tube body 101. The measuring tube body 101 has connecting flanges 102 at both ends for connecting to process pipelines, and an axially extending mounting cavity 3 in the middle of the measuring tube body 101. The mounting cavity 3 includes two symmetrically separated cavity tubes 301. The opposite ends of the cavity tubes 301 are fixedly connected to the measuring tube body 101, and the opposite ends of the cavity tubes 301 are equipped with a throttle tube assembly 2. The throttle tube assembly 2 includes an outer cylinder 401 and an inner cylinder 501 with two symmetrically separated ends. The outer cylinder 401 is located between the two cavity tubes 301, and a quick-release locking mechanism 7 is provided between the outer cylinder 401 and the cavity tubes 301. The inner cylinder 501 is inserted into the outer cylinder 401 in an axially slidable manner. A standardized throttling element 601 is integrated between the two inner cylinders 501; The cavity tube 301 is provided with an inlet section, a centering cone section, an installation straight tube section and a positioning platform stage in sequence in the direction corresponding to the outer cylinder 401; The inner cylinder 501 is provided with a conical surface that matches the centering conical section of the cavity tube 301. After the inner cylinder 501 is inserted into the cavity tube 301, radial centering is achieved through the conical surface fit. The straight section of the cavity tube 301 is integrated with an annular chamber pressure equalization and tapping structure; the pressure tapping position on the outer wall of the inner cylinder 501 is provided with a full circle of pressure equalization grooves 502, which correspond to the annular chamber pressure equalization and tapping structure. The quick-release locking mechanism 7 includes a fixed assembly piece 701 installed on the mating surface of the cavity tube 301 and a movable assembly piece 702 installed on the mating surface of the outer cylinder 401. Elastic pins 7011 are evenly and equidistantly installed on the fixed assembly piece 701; the elastic pins 7011 are used to cooperate with the pin holes 7021 on the movable assembly piece 702 to achieve initial positioning. Locking rods 7022 are screwed onto the moving assembly piece 702 at equal and even intervals; the locking rods 7022 pass through the elastic pins 7011 and are screwed onto the fixed assembly piece 701 to achieve complete locking.

[0027] The outer cylinder 401 has axially extending operating grooves 402 that are respectively opened through both sides of the cylinder wall; The inner cylinder 501 has connecting rods 503 fixedly connected to the two sides of the cylinder wall at one end, respectively, which are inserted into the control slot 402. The end of the connecting rod 503 is fixedly connected to the control handle 504 that can cover the outer port of the control slot 402; the control handles 504 on the same side are staggered. The throttling element 601 includes a standard orifice plate, a V-cone throttling element, a long-neck nozzle, a multi-hole rectifier orifice plate, and a venturi structure. Different throttling elements 601 correspond to different measurement requirements under different operating conditions. A flexible cylinder 602 is connected between the throttling element 601 and the inner cylinder 501, covering the inner port of the control groove 402.

[0028] The annular pressure equalization and pressure tapping structure includes an annular pressure equalization cavity 302 corresponding to the pressure equalization groove 502. The pressure equalization cavity 302 is completely circumferentially connected along the inner wall of the cavity tube 301, and has a rectangular cross-section with rounded corners. Radial channels 303 are evenly opened in the circumferential direction of the pressure equalization cavity 302. One end of the radial channel 303 is connected to the bottom of the pressure equalization cavity 302, and the other end converges to the external pressure tapping interface 304. A pressure tapping ring 305 is assembled on the outer wall of the cavity tube 301 corresponding to the pressure tapping interface 304. A pressure tapping valve 306 connected in series with the pressure tapping interface 304 is assembled on the upper part of the pressure tapping ring 305, and a drain valve 307 connected in series with the pressure tapping interface 304 is assembled on the lower part of the pressure tapping ring 305. The pressure tapping valves 306 of the two mounting chambers 3 are used to assemble the flow meter assembly 103.

[0029] The axial width of the pressure equalization groove 502 of the inner cylinder 501 is smaller than the axial width of the pressure equalization cavity 302; radial pressure tapping holes 505 are uniformly opened at the bottom of the pressure equalization groove 502 along the circumference, and the radial pressure tapping holes 505 are inclined in the direction of the flow.

[0030] The inner wall of the straight section of the cavity tube 301 is provided with an eccentric guide groove 308; The outer wall of the inner cylinder 501 is provided with a guide key 506 that is adapted to the eccentric guide groove 308. The guide key 506 and the eccentric guide groove 308 cooperate to achieve circumferential anti-rotation. The end face of the positioning stage of the cavity tube 301 is overlaid with hard alloy as an axial positioning reference for the inner cylinder 501.

[0031] The end face of the inner cylinder 501 is provided with a first sealing element 507, which works with the positioning platform of the cavity tube 301 to form a main seal; the conical surface of the inner cylinder is provided with a second sealing element 508, which works with the centering conical section of the cavity tube 301 to form an auxiliary seal, thus forming a dual-stage redundant sealing system.

[0032] The outer wall of the movable assembly piece 702 is movably sleeved with a ring 7023 that engages with the end of the locking rod 7022. The ring 7023 is used to synchronously drive the locking rod 7022. The two rings 7023 are connected together by a pin 7024, forming a self-locking mechanism.

[0033] A blocking frame 703 with a fitting ring 7023 is fixedly connected between the two fixed assembly pieces 701. The blocking frame 703 is located below the throttle cylinder assembly 2. The stop frame 703 is provided with a locking block 7031, which is used to lock the axial position of the operating handle 504 after assembly.

[0034] The working principle of this invention is as follows: The ring-shaped pressure equalization and tapping structure, combined with the ring-shaped pressure equalization groove 502 on the outer wall of the inner cylinder 501, is compatible with the axial displacement of the throttling cylinder assembly 2 and any slight circumferential offset. This ensures that assembly errors will not affect the pressure tapping flow area and pressure acquisition effect. The triple high-precision positioning and assembly system, formed by the radial centering of the inner cylinder 501's conical surface, the circumferential anti-rotation of the guide key 506 and the eccentric guide groove 308, and the axial limiting of the positioning platform end face of the cavity tube 301, improves the stability of measurement signal deviation after disassembly and assembly, and reduces system measurement errors. Simultaneously, the ring-shaped pressure equalization and tapping structure has an independent volumetric filtering effect, which can effectively buffer and homogenize the pressure pulsation and instantaneous velocity disturbances in the pipeline, filter measurement noise and instantaneous interference signals, and output a stable and continuous static pressure acquisition signal. This significantly improves the flowmeter's measurement accuracy and long-term operational stability under complex conditions of high flow velocity and strong flow field disturbances, achieving high-precision and high-stability measurement and improving anti-interference capabilities.

[0035] By setting up a ring-shaped pressure equalization and tapping structure, precise alignment of the pressure tapping orifice 505 is not required when assembling the throttle cylinder assembly 2. Operators can quickly complete the disassembly and replacement of the throttle cylinder assembly 2 without the need for professional calibration equipment, which greatly improves the efficiency of operation and maintenance. At the same time, the ring-shaped pressure equalization and tapping structure has no precision vulnerable parts, and has excellent overall wear resistance and deformation resistance. It can maintain high-precision pressure tapping performance even after multiple disassemblies and reassemblies, which significantly reduces the cost of manual operation and maintenance, equipment maintenance, and economic losses caused by production downtime. It effectively extends the overall service life of the equipment and greatly improves its practicality and economy.

[0036] The quick-release locking mechanism 7's blocking bracket 703 can support and place the throttle cylinder assembly 2, freeing up manual lifting. When assembling the throttle cylinder assembly 2, the elastic pin 7011 and pin hole 7021 are used to achieve quick alignment and initial locking. After the initial locking is completed, the outer cylinder 401 can still rotate to finely adjust the angle, which is convenient for further circumferential alignment without repeated insertion and removal to adjust the positioning. Then, the external ring 7023 can synchronously drive the locking rod 7022 on the same side to complete the locking operation, pressing the fixed assembly piece 701 and the moving assembly piece 702, thereby simplifying the locking operation steps, greatly shortening the replacement and disassembly time of the throttle cylinder assembly 2, and significantly improving the work efficiency of maintenance and replacement.

[0037] The throttle cylinder assembly 2 is initially positioned by the elastic pin 7011, and the locking rod 7022 is screwed onto the mounting plate 701 through the elastic pin 7011 to achieve complete locking, forming a two-stage locking constraint. This ensures that the axial and circumferential positions of the throttle cylinder assembly 2 are reliably fixed after assembly, preventing fluid impact from causing the assembly 2 to loosen and shift, and ensuring the stability of the flow meter's measurement accuracy. In addition, since the two rings 7023 rotate in opposite directions when unlocking, the two rings 7023 are simultaneously inserted by the pin 7024, forming a mechanical self-locking structure. This can prevent the rings 7023 from accidentally rotating and unlocking due to external factors such as fluid vibration and pipeline vibration during operation, prevent the locking rod 7022 from loosening and failing, avoid the risks of leakage and measurement failure caused by the loosening of the throttle cylinder assembly 2, and improve the safety and reliability of the equipment in long-term operation.

[0038] The throttle cylinder assembly 2 is configured with an outer cylinder 401 and an inner cylinder 501 that can slide relative to each other. During replacement, the inner cylinder 501 can be retracted and stored inside the outer cylinder 401, while the outer cylinder 401 is adapted to the reserved gap between the two mounting cavities 3. After the connection between the outer cylinder 401 and the mounting cavity 3 is disconnected, the outer cylinder 401 can be pulled out directly without overcoming the obstruction caused by the precise fit between the inner cylinder 501 and the mounting cavity 3, thereby simplifying the disassembly process, reducing the difficulty of on-site disassembly and assembly operations, and improving on-site maintainability.

[0039] After the outer cylinder 401 is placed into the mounting cavity 3, the inner cylinder 501 is pushed into the mounting cavity 3 by moving the operating handle 504 along the operating groove 402. The inner cylinder 501 blocks the mating gap between the mounting cavity 3 and the outer cylinder 401, forming a physical barrier to the connection gap between the two, reducing the intrusion of the medium into the gap, assisting in the sealing effect, reducing the risk of medium seeping into the assembly gap and causing dirt accumulation and leakage of the medium, and further improving the overall sealing reliability in conjunction with other sealing structures.

[0040] The movement of the inner cylinder 501 is controlled by the operating handle 504 passing through the operating groove 402 of the outer cylinder 401. The operating handle 504 and the operating groove 402 are sealed together, and the flexible cylinder 602 can prevent the medium from leaking out of the operating groove 402. After the inner cylinder 501 is pushed into place, the operating handle 504 can cover and block the operating groove 402, further blocking the passage of the operating groove 402. The locking block 7031 on the blocking frame 703 limits and fixes the operating handle 504, which can constrain the axial position of the inner cylinder 501, prevent the inner cylinder from sliding backward due to the impact and vibration of the pipeline fluid, ensure that the inner cylinder 501 always stays in the working position, ensure the barrier sealing effect and the assembly accuracy of the throttling element 601, avoid measurement deviation caused by the displacement of the inner cylinder 501, and improve the operation sealing and assembly stability.

[0041] Without disassembling or replacing the main body 101 of the measuring pipe already connected to the process pipeline, the flow meter assembly 2, which is pre-installed with different standardized throttling elements 601, can be adapted to various differentiated industrial conditions, such as clean liquids and gases, dirty and high-viscosity media, high-temperature and high-pressure steam, insufficient straight pipe sections on site, and requirements for large flow and low pressure loss. There is no need to process or modify the flow meter assembly 103, nor is there a need to reselect and purchase a complete set of flow measurement equipment according to the differences in operating conditions. When the on-site production process conditions change, the corresponding throttling cylinder assembly 2 can be flexibly switched to match the new measurement scenario, realizing rapid change of measurement mode, thereby significantly reducing purchase costs, reducing on-site pipeline installation work, and greatly improving the versatility of the flow meter equipment and the adaptability to changing on-site conditions.

[0042] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A multi-condition replaceable throttling element differential pressure flow meter, comprising a measuring tube body (101) and a throttling cylinder assembly (2) replaceably assembled in the middle of the measuring tube body (101). The measuring tube body (101) has connecting flanges (102) at both ends for connecting to process pipelines, and the measuring tube body (101) has an axially extending mounting cavity (3) in the middle. The mounting cavity (3) includes two symmetrically separated cavity tubes (301), one end of which is fixed to the measuring tube body (101), and the other end of which is fitted with a throttle tube assembly (2); characterized in that: The throttle tube assembly (2) includes an outer tube (401) and an inner tube (501) symmetrically separated at both ends; the outer tube (401) is located between two cavity tubes (301), and a quick-release locking mechanism (7) is provided between the outer tube (401) and the cavity tubes (301); the inner tube (501) is inserted into the outer tube (401) in an axially slidable manner. A standardized throttling element (601) is integrated between the two inner cylinders (501). The cavity tube (301) is provided with an inlet section, a centering cone section, an installation straight tube section and a positioning platform stage in sequence in the direction corresponding to the outer cylinder (401); The inner cylinder (501) is provided with a conical surface that is adapted to the centering conical section of the cavity tube (301). After the inner cylinder (501) is inserted into the cavity tube (301), radial centering is achieved through the conical surface. The cavity tube (301) is installed with a straight section integrated with an annular chamber pressure equalization and tapping structure; the pressure tapping position on the outer wall of the inner cylinder (501) is provided with a full circle of pressure equalization grooves (502), and the pressure equalization grooves (502) correspond to the annular chamber pressure equalization and tapping structure. The quick-release locking mechanism (7) includes a fixed assembly piece (701) installed on the mating surface of the cavity tube (301) and a movable assembly piece (702) installed on the mating surface of the outer cylinder (401). The fixed assembly piece (701) is evenly and equidistantly mounted with elastic pins (7011); the elastic pins (7011) are used to cooperate with the pin holes (7021) on the movable assembly piece (702) to achieve preliminary positioning; Locking rods (7022) are screwed evenly at equal intervals onto the moving assembly piece (702); the locking rods (7022) pass through the elastic pins (7011) and are screwed onto the fixed assembly piece (701) to achieve complete locking.

2. The differential pressure flow meter with a multi-condition replaceable throttling element according to claim 1, characterized in that: The outer cylinder (401) has axially extending operating grooves (402) that pass through both sides of its cylinder wall. The inner cylinder (501) has connecting rods (503) that are respectively fixedly connected to the two sides of the cylinder wall at one end, and corresponding to the operating slots (402). The end of the connecting rod (503) is fixedly connected to an operating handle (504) that can cover the outer port of the operating slot (402); the operating handles (504) on the same side are staggered. The flexible cylinder (602) that shields the inner port of the control groove (402) is connected between the throttling element (601) and the inner cylinder (501).

3. The differential pressure flow meter with a multi-condition replaceable throttling element according to claim 1, characterized in that: The annular pressure equalization and tapping structure includes an annular pressure equalization chamber (302) corresponding to the pressure equalization groove (502). The pressure equalization chamber (302) is completely circumferentially connected along the inner wall of the cavity tube (301), with a rectangular cross-section and rounded corners. The pressure equalization chamber (302) has radial channels (303) evenly distributed around its circumference. One end of the radial channel (303) is connected to the bottom of the pressure equalization chamber (302), and the other end converges to the external pressure tapping interface (304). The outer wall of the cavity tube (301) is fitted with a pressure tapping ring (305) corresponding to the pressure tapping interface (304). The upper part of the pressure tapping ring (305) is fitted with a pressure tapping valve (306) connected in series with the pressure tapping interface (304), and the lower part of the pressure tapping ring (305) is fitted with a drain valve (307) connected in series with the pressure tapping interface (304). The pressure tapping valves (306) of the two mounting cavities (3) are used to assemble the flow meter assembly (103).

4. A multi-condition replaceable throttling element differential pressure flowmeter according to claim 3, characterized in that: The bottom of the equalizing groove (502) is uniformly provided with radial pressure tapping holes (505) along the circumference, and the radial pressure tapping holes (505) are inclined in the direction of the flow.

5. A multi-condition replaceable throttling element differential pressure flowmeter according to claim 1, characterized in that: The inner wall of the straight section of the cavity tube (301) is provided with an eccentric guide groove (308). The outer wall of the inner cylinder (501) is provided with a guide key (506) that is adapted to the eccentric guide groove (308). The guide key (506) and the eccentric guide groove (308) cooperate to achieve circumferential anti-rotation. The end face of the positioning stage of the cavity tube (301) is overlaid with hard alloy as an axial positioning reference for the inner cylinder (501).

6. A multi-condition replaceable throttling element differential pressure flowmeter according to claim 1, characterized in that: The end face of the inner cylinder (501) is provided with a first sealing element (507) which works with the positioning stage of the cavity tube (301) to form a main seal; the conical surface of the inner cylinder is provided with a second sealing element (508) which works with the centering conical section of the cavity tube (301) to form an auxiliary seal, thus constituting a dual-stage redundant sealing system.

7. A multi-condition replaceable throttling element differential pressure flowmeter according to claim 2, characterized in that: The outer wall of the movable assembly piece (702) is movably sleeved with a ring (7023) that engages the end of the locking rod (7022), and the ring (7023) is used to synchronously drive the locking rod (7022). The two rings (7023) are connected by a common pin (7024) to form a self-locking mechanism.

8. A multi-condition replaceable throttling element differential pressure flowmeter according to claim 7, characterized in that: A blocking frame (703) with a fitting ring (7023) is fixedly connected between the two fixed assembly pieces (701), and the blocking frame (703) is located below the throttle cylinder assembly (2); The stop frame (703) is provided with a locking block (7031) for locking the axial position of the operating handle (504) after assembly.

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