An anti-corrosion throttling flowmeter suitable for corrosive medium

Abstract

The utility model belongs to flowmeter technical field especially a kind of anticorrosive throttling flowmeter suitable for corrosive medium, including flowmeter body, the flowmeter body includes upstream measuring section, downstream measuring section and round plate, by setting throttling mechanism, the efficient conversion of fluid kinetic energy and pressure energy is realized, the both ends surface of round plate is all sleeved with sealing ring, and the side surface of one end of sealing ring is closely contacted with the side surface of flange, forms sealing structure, prevents medium from leaking from flange connecting place, multiple through holes are set up on round plate, and through hole adopts the structure design of gradually reducing gradually expanding, gradually reducing section is inlet section, through hole diameter gradually reduces, fluid flow rate increases, gradually expanding section is outlet section, through hole diameter gradually increases, fluid flow rate reduces, pressure recovers, gradually expanding structure makes flow field more stable, reduces eddy current and turbulent flow noise, further balances flow field by multi-hole design, improves signal stability and repeatability.

Description

Technical Field

[0001] This utility model relates to the field of flow meter technology, and in particular to a corrosion-resistant throttling flow meter suitable for corrosive media. Background Technology

[0002] A flow meter is an instrument used to measure the flow rate of fluid in pipes or open channels. It can indicate the measured flow rate or the total amount of fluid within a selected time interval. It is widely used in industrial production, scientific research, national defense construction and other fields. The two ends of the flow meter are usually connected to the equipment and pipeline by means of flange, clamp, threaded connection or welding connection. The specific choice depends on the working conditions, such as pressure, temperature and medium characteristics.

[0003] In existing technologies, a single orifice is used for throttling. However, when measuring fluid flow, eddies and uneven flow fields are easily formed at the throttling element, resulting in high signal noise and low measurement accuracy. Furthermore, the flow meter uses a polytetrafluoroethylene coating for corrosion protection, but its wear resistance is poor, and it is easily worn in high-speed fluids or media containing particles. Long-term use will cause the coating to peel off, affecting the corrosion protection effect. Therefore, a corrosion-resistant throttling flow meter suitable for corrosive media is proposed to solve the above-mentioned problems. Utility Model Content

[0004] To address the technical problems in existing technologies where single-hole throttling easily creates eddies and uneven flow fields at the throttling element when measuring fluid flow, and where the PTFE coating has poor wear resistance and is easily worn in high-speed fluids or media containing particles, leading to coating peeling after long-term use, this application provides a corrosion-resistant throttling flow meter suitable for corrosive media.

[0005] This utility model proposes a corrosion-resistant throttling flow meter suitable for corrosive media, comprising a flow meter body, which includes an upstream measuring section, a downstream measuring section, and a circular plate.

[0006] The outer surface of the circular plate is provided with a throttling mechanism, which includes a through hole. The through hole achieves efficient conversion of fluid kinetic energy and pressure energy through its structural design.

[0007] Preferably, a flange is welded to one end of the upstream measuring section and one end of the downstream measuring section, and a pressure tapping pipe is provided on the curved surface of the flange.

[0008] The above technical solution involves welding flanges to both the upstream and downstream measuring sections, placing a circular plate in the middle, and clamping the two flanges together with bolts to fix the circular plate and form a complete flowmeter body. This facilitates the subsequent installation, disassembly, and maintenance of the flowmeter body. The centered installation of the circular plate ensures that the throttling mechanism is coaxial with the upstream and downstream measuring sections, avoiding eccentricity that could lead to uneven flow fields. Pressure taps are installed on the flanges, located in the upstream and downstream measuring sections respectively. The upstream pressure tap measures the pressure before throttling, and the downstream pressure tap measures the pressure after throttling. The pressure taps are connected to the high-pressure and low-pressure ends of the differential pressure sensor via stainless steel or flexible pressure-resistant tubing. The pressure taps are typically equipped with valves, such as needle valves or ball valves, to isolate the pressure signal during debugging and maintenance. The differential pressure sensor measures the pressure difference between the upstream and downstream sections in real time and calculates the flow rate using formulas such as Bernoulli's equation or the flowmeter calibration curve. The upstream and downstream measuring sections, flanges, and pressure taps are all made of stainless steel, which has excellent mechanical strength and corrosion resistance, making it suitable for various corrosive media.

[0009] Preferably, threaded pipes are welded to the other end of the upstream measuring section and the other end of the downstream measuring section, and bolt holes are opened on the curved surface of the threaded pipes.

[0010] The above technical solution involves welding threaded pipes to both the upstream and downstream measuring sections, facilitating the connection between the flowmeter body and the internal thread of the equipment pipeline via the external thread of the threaded pipe. Bolt holes are provided on both the threaded pipe and the equipment pipeline. After the two bolt holes are rotated and overlapped, they are further secured with bolts to prevent loosening due to vibration or medium pressure, thus enhancing the reliability of the connection. Thread sealant is applied to the interface between the external thread of the threaded pipe and the internal thread of the equipment pipeline. Fluororubber O-rings are installed at the bolt hole mating surfaces of the threaded pipe and the equipment pipeline to prevent medium leakage. The threaded pipe is also made of stainless steel, which facilitates thread processing and bolt hole preparation while ensuring dimensional accuracy and surface finish.

[0011] Preferably, the inner wall of the threaded pipe, the inner wall of the upstream measuring section, the inner wall of the downstream measuring section, the inner wall of the pressure tapping pipe, and the outer surface of the circular plate are all coated with a protective layer, and the material of the protective layer is a high-entropy alloy coating.

[0012] The above technical solution involves coating the inner walls of the threaded pipe, the upstream measuring section, the downstream measuring section, the pressure tapping pipe, and the outer surface of the circular plate with a protective layer for corrosion protection, achieving comprehensive corrosion protection. The protective layer is made of a high-entropy alloy coating, which is an alloy system composed of five or more main elements in equal or near-equal atomic ratios. It has extremely high corrosion resistance, excellent wear resistance, good high-temperature stability, and strong oxidation resistance. Its hardness can typically reach HRC60 or higher, effectively resisting fluid erosion and particle wear, extending the service life of the throttling device and measuring section, and reducing maintenance frequency. The protective layer is prepared using processes such as thermal spraying, supersonic flame spraying, or physical vapor deposition, and is tightly bonded to the substrate, thus ensuring long-term protective effects. These processes are existing technologies and will not be described in detail here.

[0013] Preferably, the throttling mechanism further includes a sealing ring, which is slidably fitted onto the arcuate surface of the circular plate.

[0014] With the above technical solution, sealing rings are fitted on both ends of the circular plate, and one side of the sealing ring is in close contact with the side of the flange to form a sealing structure, preventing the medium from leaking from the flange connection and ensuring the sealing performance and safety of the flow meter body. The sealing ring can be made of fluororubber, which has excellent high temperature resistance and oil resistance, is suitable for high temperature or oil-containing media, and has high mechanical strength and stable sealing performance.

[0015] Preferably, a plurality of the through holes are formed on the outer side of the circular plate, and the through holes adopt a gradually narrowing and expanding structure design.

[0016] The above technical solution involves opening multiple through holes on a circular plate, with the through holes adopting a gradually narrowing and expanding structure design. The narrowing section is the inlet section, where the diameter of the through hole gradually decreases and the fluid velocity increases. The expanding section is the outlet section, where the diameter of the through hole gradually increases and the fluid velocity decreases and the pressure recovers. The narrowing and expanding structure makes the flow field more stable, reduces eddy and turbulent noise, and the multi-hole design further balances the flow field, improving signal stability and repeatability.

[0017] The beneficial effects of this utility model are as follows:

[0018] 1. The flow meter consists of an upstream measuring section, a downstream measuring section, and a circular plate. Flanges are welded to both the upstream and downstream measuring sections. The circular plate is placed in the middle, and the two flanges are clamped together with bolts to fix the circular plate and form a complete flow meter body. The upstream pressure tap measures the pressure before throttling, and the downstream pressure tap measures the pressure after throttling. Threaded pipes are welded to the other ends of both the upstream and downstream measuring sections, facilitating the connection between the flow meter body and the internal threads of the equipment pipeline via the external threads of the threaded pipes. Bolt holes are provided on the threaded pipes, and bolt holes are also provided on the equipment pipeline. The bolt holes are further secured by bolts after the two bolt holes are rotated and overlapped, preventing the threads from loosening due to vibration or medium pressure. The inner walls of the threaded pipe, the upstream measuring section, the downstream measuring section, the pressure tapping pipe, and the outer surface of the circular plate are all coated with a protective layer for corrosion protection, thus achieving comprehensive corrosion protection. This solves the technical problem in the existing technology where flowmeters use polytetrafluoroethylene coating for corrosion protection, but its wear resistance is poor, it is easily worn in high-speed fluids or media containing particles, and long-term use will cause the coating to fall off, affecting the corrosion protection effect.

[0019] 2. By setting a throttling mechanism, efficient conversion of fluid kinetic energy and pressure energy is achieved. Both ends of the circular plate are fitted with sealing rings, and one side of the sealing ring is in close contact with the side of the flange to form a sealing structure, preventing the medium from leaking from the flange connection. Multiple through holes are opened on the circular plate, and the through holes adopt a gradually narrowing and expanding structure design. The narrowing section is the inlet section, where the diameter of the through hole gradually decreases and the fluid velocity increases. The expanding section is the outlet section, where the diameter of the through hole gradually increases, the fluid velocity decreases, and the pressure recovers. The gradually narrowing and expanding structure makes the flow field more stable, reduces eddy and turbulent noise, and the multi-hole design further balances the flow field, improves signal stability and repeatability, and solves the technical problem in the existing technology that uses a single hole for throttling, but when measuring fluid flow, eddy currents and uneven flow fields are easily formed at the throttling device, resulting in large signal noise and low measurement accuracy. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of a corrosion-resistant throttling flow meter suitable for corrosive media proposed in this utility model;

[0021] Figure 2 This is a perspective view of the sealing ring structure of a corrosion-resistant throttling flowmeter suitable for corrosive media proposed in this utility model;

[0022] Figure 3 This is a perspective view of the upstream measuring section structure of a corrosion-resistant throttling flowmeter suitable for corrosive media proposed in this utility model;

[0023] Figure 4This is a perspective view of the pressure tapping tube structure of a corrosion-resistant throttling flowmeter suitable for corrosive media proposed in this utility model.

[0024] Figure 5 This is a perspective view of the through-hole structure of a corrosion-resistant throttling flowmeter suitable for corrosive media proposed in this utility model.

[0025] In the diagram: 1. Flowmeter body; 2. Upstream measuring section; 21. Downstream measuring section; 22. Flange; 23. Pressure tapping pipe; 3. Threaded pipe; 31. Bolt hole; 4. Circular plate; 41. Protective layer; 5. Sealing ring; 6. Through hole. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0027] Reference Figures 1-5 A corrosion-resistant throttling flow meter suitable for corrosive media includes a flow meter body 1, which includes an upstream measuring section 2, a downstream measuring section 21, and a circular plate 4.

[0028] To fix the circular plate 4, flanges 22 are welded to one end of the upstream measuring section 2 and one end of the downstream measuring section 21. Pressure taps 23 are provided on the curved surface of the flanges 22. The circular plate 4 is placed in the middle through the flanges 22 welded to the upstream measuring section 2 and the downstream measuring section 21. The two flanges 22 are clamped together with bolts to fix the circular plate 4 and form a complete flowmeter body 1 for subsequent installation, disassembly and maintenance of the flowmeter body 1. The circular plate 4 is installed in the center to ensure that the throttling mechanism is coaxial with the upstream and downstream measuring sections 21, avoiding eccentricity that would cause uneven flow field. Pressure taps 23 are provided on the flanges 22, located in the upstream measuring section 2 and the downstream measuring section 21 respectively. The upstream pressure tap 23 is used to measure the pressure before throttling, and the downstream pressure tap 23 is used to measure the pressure after throttling. The pressure tap 23 is connected to the high-pressure end and low-pressure end of the differential pressure sensor through a stainless steel pressure tap or a flexible pressure-resistant hose. The pressure tap is usually equipped with a valve, such as a needle valve or a ball valve, to isolate the pressure signal during debugging and maintenance. The differential pressure sensor measures the pressure difference between the upstream and downstream in real time and calculates the flow rate through formulas, such as Bernoulli's equation or the flow meter calibration curve. The upstream measuring section 2, the downstream measuring section 21, the flange 22, and the pressure tap 23 are all made of stainless steel, which has excellent mechanical strength and corrosion resistance and is suitable for a variety of corrosive media.

[0029] To prevent loosening of the threads due to vibration or medium pressure, threaded pipes 3 are welded to the other end of the upstream measuring section 2 and the other end of the downstream measuring section 21. Bolt holes 31 are opened on the curved surface of the threaded pipe 3. The threaded pipe 3 is welded to the other end of the upstream measuring section 2 and the other end of the downstream measuring section 21, which facilitates the connection of the flowmeter body 1 to the internal thread of the equipment pipeline through the external thread of the threaded pipe 3. Bolt holes 31 are opened on the threaded pipe 3 and the equipment pipeline. After the two bolt holes 31 are rotated and overlapped, they are further fixed by bolts to prevent loosening of the threads due to vibration or medium pressure and enhance the reliability of the connection. Thread sealant is applied to the interface between the external thread of the threaded pipe 3 and the internal thread of the equipment pipeline. Fluororubber O-rings are applied to the mating surface of the threaded pipe 3 and the bolt hole 31 of the equipment pipeline to prevent medium leakage. The threaded pipe 3 is also made of stainless steel, which is easy to process threads and open bolt holes 31, while ensuring dimensional accuracy and surface finish.

[0030] To achieve comprehensive corrosion protection, a protective layer 41 is applied to the inner walls of the threaded pipe 3, the upstream measuring section 2, the downstream measuring section 21, the pressure tapping pipe 23, and the outer surface of the circular plate 4. The protective layer 41 is made of a high-entropy alloy coating. This protective layer 41 provides comprehensive corrosion protection for the inner walls of the threaded pipe 3, the upstream measuring section 2, the downstream measuring section 21, the pressure tapping pipe 23, and the outer surface of the circular plate 4. Alloy systems composed of one or more main elements in equiatomic or near-equiatomic ratios possess extremely high corrosion resistance, excellent wear resistance, good high-temperature stability, and strong oxidation resistance. Their hardness typically reaches HRC60 or higher, effectively resisting fluid erosion and particle wear, extending the service life of throttling devices and measuring sections, and reducing maintenance frequency. The protective layer 41 is prepared by processes such as thermal spraying, supersonic flame spraying, or physical vapor deposition, and is tightly bonded to the substrate, thereby ensuring long-term protective effects. These processes are all existing technologies, so they will not be described in detail here.

[0031] By setting up an upstream measuring section 2, a downstream measuring section 21, and a circular plate 4, both the upstream and downstream measuring sections 21 are welded with flanges 22. The circular plate 4 is placed in the middle, and the two flanges 22 are clamped together with bolts, thereby fixing the circular plate 4 and forming a complete flowmeter body 1. The upstream pressure tap 23 is used to measure the pressure before throttling, and the downstream pressure tap 23 is used to measure the pressure after throttling. The other end of the upstream measuring section 2 and the other end of the downstream measuring section 21 are both welded with threaded pipes 3, which facilitate the connection of the flowmeter body 1 to the internal thread of the equipment pipeline through the external thread of the threaded pipe 3. Bolt holes 31 are opened on the threaded pipe 3. Similarly, bolt holes 31 are provided. After the two bolt holes 31 are rotated and overlapped, they are further fixed by bolts to prevent the threads from loosening due to vibration or medium pressure. The inner wall of the threaded pipe 3, the inner wall of the upstream measuring section 2, the inner wall of the downstream measuring section 21, the inner wall of the pressure tapping pipe 23, and the outer surface of the circular plate 4 are all coated with a protective layer 41 to protect them from corrosion. This achieves comprehensive corrosion protection and solves the technical problem in the prior art where flowmeters use polytetrafluoroethylene coating for corrosion protection, but its wear resistance is poor, it is easy to wear in high-speed fluids or media containing particles, and long-term use will cause the coating to fall off, affecting the corrosion protection effect.

[0032] In order to achieve efficient conversion of fluid kinetic energy and pressure energy, a throttling mechanism is provided on the outer side of the circular plate 4. The throttling mechanism includes a through hole 6, which achieves efficient conversion of fluid kinetic energy and pressure energy through its structural design.

[0033] To ensure the sealing and safety of the flow meter body 1, the throttling mechanism also includes a sealing ring 5. The sealing ring 5 is slidably fitted onto the arc surface of the circular plate 4. Both ends of the circular plate 4 are fitted with sealing rings 5, and one side of the sealing ring 5 is in close contact with the side of the flange 22 to form a sealing structure, preventing the medium from leaking from the flange 22 connection and ensuring the sealing and safety of the flow meter body 1. The sealing ring 5 can be made of fluororubber, which has excellent high temperature resistance and oil resistance, is suitable for high temperature or oil-containing media, and has high mechanical strength and stable sealing performance.

[0034] To reduce eddy and turbulent noise, multiple through holes 6 are formed on the outer surface of the circular plate 4. The through holes 6 adopt a gradually narrowing and expanding structure design. The narrowing section is the inlet section, where the diameter of the through hole 6 gradually decreases and the fluid velocity increases. The expanding section is the outlet section, where the diameter of the through hole 6 gradually increases, the fluid velocity decreases, and the pressure recovers. The gradually narrowing and expanding structure makes the flow field more stable, reduces eddy and turbulent noise, and the multi-hole design further balances the flow field, improving signal stability and repeatability.

[0035] By setting a throttling mechanism, efficient conversion of fluid kinetic energy and pressure energy is achieved. Both ends of the circular plate 4 are fitted with sealing rings 5, and one side of the sealing ring 5 is in close contact with the side of the flange 22 to form a sealing structure, preventing the medium from leaking from the flange 22 connection. Multiple through holes 6 are opened on the circular plate 4, and the through holes 6 adopt a gradually narrowing and expanding structure design. The narrowing section is the inlet section, where the diameter of the through hole 6 gradually decreases and the fluid velocity increases. The expanding section is the outlet section, where the diameter of the through hole 6 gradually increases, the fluid velocity decreases, and the pressure recovers. The narrowing and expanding structure makes the flow field more stable, reduces eddy and turbulent noise, and the multi-hole design further balances the flow field, improves signal stability and repeatability, and solves the technical problem in the prior art that when using a single hole for throttling, eddy currents and uneven flow fields are easily formed at the throttling device when measuring fluid flow, resulting in large signal noise and low measurement accuracy.

[0036] Working principle: When assembling the flow meter body 1, slide the sealing ring 5 onto the arc surface of the circular plate 4, ensuring that the sealing ring 5 is tightly fitted with the circular plate 4 and that the sealing ring 5 is correctly positioned. Place the circular plate 4 between the upstream measuring section 2 and the downstream measuring section 21, ensuring that the circular plate 4 is centered and that the throttling mechanism is coaxial with the upstream and downstream measuring sections 21. At the same time, ensure that one side of the sealing ring 5 will contact the flange 22. Use bolts to clamp the two flanges 22 to fix the circular plate 4, forming a complete flow meter body 1. Check whether the sealing ring 5 is in tight contact with the side of the flange 22 to ensure that there is no risk of leakage.

[0037] When installing the flow meter body 1, align the threaded tube 3 of the flow meter body 1 with the interface of the equipment pipeline. Connect the external thread of the threaded tube 3 with the internal thread of the equipment pipeline. Rotate the threaded tube 3 until the bolt hole 31 on the threaded tube 3 is completely aligned with the bolt hole 31 on the equipment pipeline. After the bolt hole 31 is aligned, insert the bolt and tighten it to prevent the thread from loosening due to vibration or medium pressure. Apply thread sealant to the interface between the threaded tube 3 and the equipment pipeline to enhance the sealing performance. Place a fluororubber O-ring on the mating surface of the bolt hole 31 of the threaded tube 3 and the equipment pipeline to further prevent medium leakage. Finally, confirm that the bolt is tightened and the threaded connection is not loose. Check that the sealant and O-ring are installed in place to ensure there are no leaks.

[0038] When a differential pressure sensor needs to be installed, connect the upstream pressure tapping pipe 23 to the high-pressure end of the differential pressure sensor through a stainless steel pressure tapping pipe or a flexible pressure-resistant hose, and connect the downstream pressure tapping pipe 23 to the low-pressure end of the differential pressure sensor. Ensure that the pressure tapping pipes are securely connected and leak-free. Equip the pressure tapping pipes with valves to isolate the pressure signal during commissioning and maintenance. During initial installation, keep the valves open to ensure normal transmission of the pressure signal. Fix the differential pressure sensor in a suitable position to ensure its stability and ease of reading. Calibrate the differential pressure sensor to ensure that its measurement accuracy meets the requirements.

[0039] When using the flow meter body 1, start the fluid system to ensure normal medium flow. The differential pressure sensor measures the pressure difference between the upstream pressure tap 23 and the downstream pressure tap 23 in real time.

[0040] Based on the measurements from the differential pressure sensor, the flow rate is calculated using Bernoulli's equation or the flow meter calibration curve. The differential pressure and flow rate data are recorded for subsequent analysis and monitoring, ensuring the normal operation of the data acquisition system and real-time monitoring of flow rate changes.

[0041] Regularly check the integrity of each component of the flowmeter body 1, especially the sealing ring 5, pressure tapping pipe 23 and threaded pipe 3. Check the protective layer 41 for wear or detachment, and repair it if necessary. When it is necessary to repair or replace the components, close the valve on the pressure tapping pipe, isolate the pressure signal, and ensure that there is no pressure in the system before disassembling and repairing. If the sealing ring 5 is found to be aged or damaged, remove the flange 22 and replace it with a new sealing ring 5. If the circular plate 4 or through hole 6 is severely worn, replace it with a new circular plate 4 to ensure the performance of the throttling mechanism.

[0042] After the maintenance is completed, the flow meter body 1 is reassembled and installed and debugged according to the aforementioned process. A pressure test is then conducted to ensure there are no leaks before resuming normal operation.

[0043] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A corrosion-resistant throttling flow meter suitable for corrosive media, comprising a flow meter body (1), characterized in that: The flow meter body (1) includes an upstream measuring section (2), a downstream measuring section (21), and a circular plate (4); The inner wall of the threaded pipe (3), the inner wall of the upstream measuring section (2), the inner wall of the downstream measuring section (21), the inner wall of the pressure tapping pipe (23), and the outer surface of the circular plate (4) are all coated with a protective layer (41), and the material of the protective layer (41) is a high-entropy alloy coating. The outer side of the circular plate (4) is provided with a throttling mechanism, which includes a through hole (6). The through hole (6) achieves efficient conversion of fluid kinetic energy and pressure energy through its structural design. Multiple through holes (6) are formed on the outer side of the circular plate (4), and the through holes (6) adopt a gradually shrinking and expanding structure design.

2. The corrosion-resistant throttling flow meter suitable for corrosive media according to claim 1, characterized in that: Flanges (22) are welded to one end of the upstream measuring section (2) and one end of the downstream measuring section (21), and pressure tapping pipes (23) are provided on the arc surface of the flanges (22).

3. The corrosion-resistant throttling flow meter suitable for corrosive media according to claim 2, characterized in that: The other end of the upstream measuring section (2) and the other end of the downstream measuring section (21) are both welded with threaded pipes (3), and bolt holes (31) are opened on the arc surface of the threaded pipes (3).

4. A corrosion-resistant throttling flow meter suitable for corrosive media according to claim 3, characterized in that: The throttling mechanism also includes a sealing ring (5), which is slidably fitted onto the arcuate surface of the circular plate (4).

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