Electromagnetic flowmeter with anti-fouling function

Abstract

The utility model discloses an electromagnetic flowmeter with anti -incrustation function, including the casing, the casing top is provided with the sealed joint, the casing is connected with the converter through the sealed joint, the converter place is provided with the display screen, the inside intermediate position electric connection of casing has the electrode, the casing inner wall top and below all are installed with excitation coil, the left side of casing is the inflow port, and the right side of casing is the outflow port, the inflow port installs the antifouling piece, and the outflow port installs the turbine. This scheme is provided with inflow port, antifouling piece, scale -inhibiting membrane, particle, outflow port and turbine, when fluid passes through scale -inhibiting membrane, reduce the risk that particle or incrustation adheres at subsequent electrode, and the turbine installed in the outflow port can accelerate fluid again, make fluid have the change characteristic of continuation, avoid incrustation accumulation at the same time, prevent the influence of flow velocity, improve the anti -incrustation performance of electromagnetic flowmeter in hard water body or chemical corrosive medium.

Description

Technical Field

[0001] This utility model relates to the field of electromagnetic flowmeter technology, specifically to an electromagnetic flowmeter with anti-scaling function. Background Technology

[0002] A flow meter is an instrument used to measure the flow rate of fluids in closed pipes, and it is widely used in water treatment, food, chemical, pharmaceutical, and petroleum industries. Based on different measurement principles, flow meters are classified into various types, including differential pressure, float, electromagnetic, ultrasonic, and vortex flow meters. Among them, electromagnetic flow meters have advantages such as high measurement accuracy, low pressure loss, and suitability for conductive fluids, and are widely used in industrial measurement.

[0003] In practical applications, especially in measuring hardness ions (such as Ca²⁺), 2+ Mg 2+ Electromagnetic flowmeters often face scaling problems when handling media such as groundwater, sewage, or industrial circulating water. As fluid passes through the flowmeter's internal measuring chamber, scale, dirt, and deposits easily form on the inner wall of the measuring tube, the electrode surface, or the flow guide. These deposits can hinder the uniformity of the electric field, cause signal drift, and even lead to measurement failure. Currently, common flowmeters typically prevent scaling through the following methods: 1) regular manual cleaning of the electrodes and measuring chamber; 2) adding a backflushing structure or chemical cleaning channel; and 3) incorporating a periodic zero-point calibration function in the software.

[0004] The most common interception-type anti-scaling structure involves setting up physical filters or scale-inhibiting membranes inside the fluid channel to achieve initial interception of impurities. However, since these structures are usually located within the main fluid channel, they can easily create significant resistance to the fluid, causing a decrease in flow velocity. This is especially problematic in low-pressure pipelines, potentially leading to flow instability, increased measurement errors, or even signal acquisition failure. Therefore, there is an urgent need for an electromagnetic flowmeter with anti-scaling capabilities to overcome these technical shortcomings. Utility Model Content

[0005] The purpose of this invention is to provide an electromagnetic flowmeter with anti-scaling function to solve the problem mentioned in the background art that the scale inhibition structure can easily generate significant resistance to the fluid, resulting in a decrease in flow velocity, which may cause unstable flow, increased measurement error, or even signal acquisition failure.

[0006] To achieve the above objectives, this utility model provides the following technical solution: an electromagnetic flowmeter with anti-scaling function, comprising a housing, a sealing joint at the top of the housing, a converter connected to the housing through the sealing joint, a display screen at the converter, an electrode electrically connected to the middle position inside the housing, excitation coils installed above and below the inner wall of the housing, an inlet on the left side of the housing, an outlet on the right side of the housing, an anti-scaling plate installed at the inlet, and a turbine installed at the outlet.

[0007] As a further technical solution of this utility model, the excitation coil is provided in two sets, the excitation coil is semi-arc, and the two sets of excitation coils are symmetrically distributed about the electrodes.

[0008] As a further technical solution of this utility model, the anti-scaling plate is shaped to match the inner wall of the inlet, a slot is provided in the anti-scaling plate, an anti-scaling membrane is embedded in the anti-scaling plate through the slot, and a wall groove is provided at the top of the inlet.

[0009] As a further technical solution of this utility model, a sealing strip is welded to the top of the scale inhibitor membrane, the arc of the sealing strip fits the outer wall of the inlet, and the sealing strip is fixedly connected to the outer wall of the inlet by screws.

[0010] As a further technical solution of this utility model, the bottom of the scale inhibitor membrane is flat and the interior of the scale inhibitor membrane is filled with particles.

[0011] As a further technical solution of this utility model, a step is processed on the inner wall of the inlet near the excitation coil, and the anti-scalding plate abuts against the step.

[0012] As a further technical solution of this utility model, a locking block is machined in the middle of the inner wall of the outlet, and a locking groove is opened at the top and bottom of the turbine edge, and the locking block is engaged and fixed with the locking groove.

[0013] As a further technical solution of this utility model, the cross-section of the card block is a "T" structure, and the turbine size is adapted to the outlet.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] 1. Primary protective function of scale inhibitors and scale membranes: The scale inhibitor at the inlet is shaped to match the inner wall of the inlet, and the scale membrane embedded inside is filled with particles. When fluid passes through, the particles can create local turbulence, which helps to inhibit the flow of calcium in the water. 2+ Mg 2+ The scale-inhibiting membrane intercepts and disperses scale-forming ions, while also filtering out some particulate matter, significantly reducing the risk of scale formation at subsequent electrodes and minimizing scale buildup at the source.

[0016] 2. Flow velocity compensation and anti-accumulation function of the turbine: The turbine installed at the outlet is adapted to the size of the outlet. When the fluid passes through, the turbine can accelerate it again, maintain the continuous flow characteristics of the fluid, avoid scale accumulation caused by the reduction of flow velocity, and compensate for the flow velocity loss that may be caused by the anti-scaling structure, ensure flow stability and reduce measurement errors.

[0017] 3. Improved magnetic field stability of the excitation coil: The two sets of semi-arc excitation coils are symmetrically distributed about the electrodes, which can form a uniform and stable induced magnetic field in the measurement cavity, ensuring the consistency of electromagnetic signal acquisition. Even when the fluid is slightly disturbed by the anti-scaling structure, it can still maintain high measurement accuracy.

[0018] 4. Convenience of maintenance in structural design: The anti-scaling plate is fixed by step abutment, the anti-scaling membrane is embedded by slot, and the sealing strip at the top is attached to the outer wall of the inlet and fixed by screws. When disassembling, simply loosen the screws to pull out the anti-scaling membrane without disassembling the entire housing; the turbine is fixed by the slot engaging with the T-shaped block of the outlet. Assembly and replacement do not require tools, significantly reducing maintenance costs.

[0019] 5. Enhanced anti-interference and adaptability: The particles in the scale inhibitor membrane are made of modified zirconium silicate material with a silane anti-scale layer on the surface, which has anti-adhesion and anti-corrosion capabilities. Combined with the turbulence effect of the turbine, the flow meter can still maintain stable operation in hard water or chemically corrosive media, thus broadening the applicable scenarios. Attached Figure Description

[0020] Figure 1 This is a frontal cross-sectional view of the present invention.

[0021] Figure 2 This is a schematic diagram of the inlet cross-sectional structure of this utility model;

[0022] Figure 3 For the present utility model Figure 1 Enlarged structural diagram of point A in the middle;

[0023] Figure 4 This is a side view schematic diagram of the turbine structure of this utility model.

[0024] In the diagram: 1. Housing; 2. Sealing joint; 3. Converter; 4. Display screen; 5. Excitation coil; 6. Anti-scaling plate; 7. Inlet; 8. Step; 9. Electrode; 10. Locking block; 11. Locking slot; 12. Turbine; 13. Outlet; 14. Slot; 15. Anti-scaling membrane; 16. Particle; 17. Wall groove; 18. Sealing strip; 19. Screw. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] Please see Figure 1-4This utility model provides an electromagnetic flowmeter with anti-scaling function.

[0027] Example 1

[0028] This solution discloses an electromagnetic flowmeter with anti-scaling function, mainly including a housing 1, a sealing joint 2, a converter 3, a display screen 4, an electrode 9, an excitation coil 5, an inlet 7, an anti-scaling plate 6, an outlet 13, and a turbine 12. The housing 1 has a sealing joint 2 at its top, which connects to the converter 3. The converter 3 has a display screen 4. The electrode 9 is electrically connected to the middle of the housing 1, and the excitation coil 5 is installed on the upper and lower inner walls. The inlet 7 is on the left side of the housing 1, and the outlet 13 is on the right side. The inlet 7 is equipped with the anti-scaling plate 6, and the outlet 13 is equipped with the turbine 12.

[0029] Solution Analysis: This embodiment integrates core functional components to construct an integrated structure of "anti-scaling - measurement - flow rate compensation". The anti-scaling plate 6 at the inlet 7 serves as the first line of defense, intercepting particulate matter and easily scale-forming components in the fluid; the electrodes 9 and symmetrically distributed excitation coils 5 inside the housing 1 form the measurement core, using the principle of electromagnetic induction to collect flow signals; the turbine 12 at the outlet 13 accelerates the fluid to solve the flow rate attenuation problem that may be caused by the anti-scaling structure. All components form a closed measurement chamber through the housing 1, and the sealing joint 2 ensures the airtight connection between the converter 3 and the housing 1, avoiding external environmental interference. The display screen 4 outputs the measurement results in real time, realizing functional integration.

[0030] Technical Effects: This structure is the first to combine the anti-scaling plate 6 with the turbine 12. The anti-scaling plate 6 reduces the source of scaling, while the turbine 12 maintains the hydrodynamic characteristics, solving the problems of reduced flow velocity and unstable flow caused by traditional interception-type anti-scaling structures. In hard water tests, the amount of scale on the electrode 9 surface was reduced by 12% compared to traditional electromagnetic flowmeters. Simultaneously, due to the stable flow, the measurement error was controlled within ±0.5%, significantly improving its applicability in complex media.

[0031] Example 2

[0032] Based on Example 1, this scheme further specifies that the excitation coil 5 is set in two sets, which are semi-arc-shaped and symmetrically distributed about the electrode 9.

[0033] Solution Analysis: The semi-circular design allows the excitation coil 5 to fit snugly against the inner wall of the housing 1, increasing the range of interaction with the fluid. The two sets of coils are symmetrical about the electrode 9, forming a mirror magnetic field on both sides of the electrode 9, ensuring a uniform distribution of magnetic field strength across the cross-section of the measuring cavity. When fluid passes through, regardless of any slight asymmetry in the flow velocity distribution, it can cut through the uniform magnetic field, generating a stable induced electromotive force and avoiding signal fluctuations caused by magnetic field deviation.

[0034] Technical effects: The symmetrically distributed semi-circular excitation coils 5 improve magnetic field uniformity by 8%. In low-flow-velocity (0.5 m / s) and high-flow-velocity (5 m / s) scenarios, the signal fluctuation amplitude acquired by electrode 9 is reduced by 3% and 2.5%, respectively, significantly improving measurement stability under different flow velocity conditions. Simultaneously, the arc-shaped structure reduces the coil's resistance to the fluid, synergizing with the flow velocity compensation effect of turbine 12 to further reduce flow disturbances.

[0035] Example 3

[0036] Based on Example 2, this solution limits the shape of the anti-scaling sheet 6 to match the inner wall of the inlet 7, opens a slot 14 in the anti-scaling sheet 6, and embeds the anti-scaling membrane 15 through the slot 14. The top of the inlet 7 opens a wall groove 17.

[0037] Solution Analysis: The compatibility between the scale inhibitor 6 and the inner wall of the inlet 7 ensures a smooth transition with the inner wall of the pipe after installation, reducing fluid resistance; the slot 14 provides a precise installation position for the scale inhibitor 15, preventing the scale inhibitor 15 from shifting due to fluid impact; the wall groove 17 provides reserved space for the removal of the scale inhibitor 15, and together with the guiding effect of the slot 14, the replacement of the scale inhibitor 15 does not require adjustment of the fixed state of the scale inhibitor 6.

[0038] Technical benefits: This structure increases the utilization rate of the filter area of ​​the scale inhibitor membrane 15 by 15% and reduces the risk of local scaling caused by installation misalignment; at the same time, the cooperation between the wall groove 17 and the slot 14 shortens the replacement time of the scale inhibitor membrane 15 to less than 2 minutes (the traditional structure requires more than 10 minutes), which greatly improves maintenance efficiency.

[0039] Example 4

[0040] Based on Example 3, this solution specifies that a sealing strip 18 is welded to the top of the scale inhibitor membrane 15, the arc of the sealing strip 18 fits the outer wall of the inlet 7, and is fixedly connected to the outer wall of the inlet 7 by screws 19.

[0041] Solution Analysis: The curvature of the sealing strip 18 fits snugly against the outer wall of the inlet 7, preventing fluid leakage from the gap between the anti-scaling plate 6 and the inlet 7. The fixing method of the screw 19 ensures both sealing reliability and easy disassembly—after loosening the screw 19, the sealing strip 18 can pull the anti-scaling membrane 15 out along the slot 14, enabling quick replacement. The sealing strip 18 is made of nitrile rubber, which has chemical corrosion resistance and is suitable for various media.

[0042] Technical benefits: This sealing structure reduces the leakage rate of inlet 7 to 0, while the screw connection method of 19 allows for the replacement of the scale inhibitor membrane 15 without the need for specialized tools, enabling ordinary operators to complete the task, significantly improving maintenance convenience. In corrosive media tests, the service life of the sealing strip 18 reached 12 months, which is 30% longer than that of traditional sealing structures.

[0043] Example 5

[0044] Based on Example 4, this solution defines the scale inhibitor membrane 15 as having a flat bottom and being filled with particles 16 inside.

[0045] Solution Analysis: The flat bottom design of the scale inhibitor membrane 15 ensures a tight fit with the bottom of the slot 14 of the scale inhibitor plate 6, preventing the particles 16 from leaking out. The particles 16 are made of 3-5mm modified zirconium silicate with a silane scale inhibitor layer on the surface. When fluid passes through, the particles 16 can collide to form local turbulence, dispersing scale ions in the water. At the same time, the scale inhibitor layer on its surface can adsorb some Ca. 2+ Mg 2+ This reduces ion deposition at the subsequent electrode 9.

[0046] Technical effects: The turbulence effect of particles 16 increases the turbulence intensity of the fluid at the inlet 7 by 8% and improves the dispersion rate of scale ions by 10%; the flat bottom design makes the particle 16 filling density uniform, avoiding local filtration failure. After 30 days of continuous operation, the scale thickness on the surface of electrode 9 is reduced by 15μm compared with the traditional structure.

[0047] Example 6

[0048] Based on embodiment 5, this solution defines a step 8 on the inner wall of the inlet 7 near the excitation coil 5, and the anti-scalding plate 6 abuts against the step 8.

[0049] Solution Analysis: Step 8 provides axial restraint for the anti-scaling plate 6. When fluid flows in from the inlet 7, the impact force mainly acts on the front end face of the anti-scaling plate 6, while step 8 can offset most of the axial force, preventing the anti-scaling plate 6 from shifting due to long-term impact. The contact surface between step 8 and the anti-scaling plate 6 is polished, which, combined with the tight fit between the anti-scaling plate 6 and the inner wall of the inlet 7, further enhances the structural stability.

[0050] Technical benefits: This design ensures that the anti-scaling plate 6 does not shift significantly even under the impact of a flow rate of 10m / s, improving structural stability by 40%. At the same time, the contact between the step 8 and the anti-scaling plate 6 reduces the risk of fluid leakage from the gaps, ensuring that the filtration efficiency of the anti-scaling plate 6 remains above 95%.

[0051] Example 7

[0052] Based on embodiment 6, this solution specifies that a locking block 10 is machined in the middle of the inner wall of the outlet 13, and a locking groove 11 is opened at the top and bottom of the edge of the turbine 12, and the locking block 10 is engaged and fixed with the locking groove 11.

[0053] Solution Analysis: The engaging structure of the locking block 10 and the locking groove 11 enables the turbine 12 to be quickly positioned and installed without bolts, reducing the resistance of the protruding parts in the outlet 13 to the fluid; the upper and lower locking grooves 11 on the edge of the turbine 12 cooperate with the locking block 10 to limit the axial and radial displacement of the turbine 12, ensuring its stability during high-speed rotation.

[0054] Technical benefits: The snap-fit ​​structure reduces the installation time of turbine 12 to 30 seconds, improving efficiency by 60% compared to bolt connection; at the same time, the design without protruding parts reduces fluid resistance by 5%, improves the rotational stability of turbine 12, and prevents flow rate fluctuations caused by loosening during continuous operation.

[0055] Example 8

[0056] Based on embodiment 7, this solution limits the cross-section of the card block 10 to a "T" structure, and the size of the turbine 12 is adapted to the outlet 13.

[0057] Solution Analysis: The "T"-shaped locking block 10 and the slot 11 work together to form an axial lock, preventing the turbine 12 from moving axially under fluid impact; the size matching between the turbine 12 and the outlet 13 ensures that the gap between its outer circumference and the inner wall of the outlet 13 is less than 0.5mm, which does not affect the rotation of the turbine 12, and also prevents the fluid from short-circuiting through the gap, thus ensuring the acceleration effect of the turbine 12 on the fluid.

[0058] Technical benefits: The "T" structure keeps the axial movement of the turbine 12 within 0.1mm, improving rotational stability by 25%; the size-adaptive design enables the turbine 12 to achieve a flow rate compensation efficiency of 98%, and even when the flow rate drops by 3% due to the anti-fouling sheet 6, it can still restore the flow rate to 99% of the design value, ensuring measurement accuracy.

[0059] Working Principle: This solution achieves flow measurement based on the principle of electromagnetic induction. The core process is as follows: Two sets of semi-arc excitation coils 5 are symmetrically distributed on both sides of the electrode 9 inside the housing 1. After being energized, they generate a uniform and stable magnetic field. The fluid enters from the inlet 7 and is first filtered by the scale-inhibiting membrane 15 in the scale-inhibiting plate 6. The particles 16 in the membrane disperse scale ions through turbulence, reducing scale adhesion at the electrode 9. After the fluid enters the measuring chamber, it cuts the magnetic field, generating an induced electromotive force proportional to the flow velocity at both ends of the electrode 9. The electromotive force is transmitted to the converter 3 through the electrode 9, converted into a flow signal, and output through the display screen 4. When the fluid flows out, the turbine 12 at the outlet 13 rotates under the action of the fluid, accelerating the fluid again, maintaining its flow characteristics, and preventing scale accumulation. At the same time, the scale-inhibiting plate 6 is fixed by the step 8, the scale-inhibiting membrane 15 is fixed to the sealing strip 18 by the screw 19, and the turbine 12 is fixed to the slot 11 by the T-shaped locking block 10, ensuring the overall structure is stable and easy to maintain.

[0060] Technical effects of implementing this solution:

[0061] Significantly improved scale prevention performance: Through the synergistic effect of scale inhibition membrane 15 filtration, particle 16 turbulence and turbine 12 acceleration, after 90 days of continuous operation in hard water, the amount of scale on the surface of electrode 9 is reduced by 42% compared with traditional electromagnetic flowmeters, and the scale thickness on the inner wall of outlet 13 is reduced by 38%.

[0062] Stable measurement accuracy: The symmetrically distributed excitation coils 5 ensure a uniform magnetic field, and the turbine 12 maintains a stable flow state. Within the flow velocity range of 0.5-10m / s, the measurement error is always controlled within ±0.5%, which is 50% higher than the traditional structure (error ±1.0%).

[0063] Reduced maintenance costs: The pull-out replacement of the scale inhibitor membrane 15 and the snap-fit ​​installation of the turbine 12 reduce the single maintenance time from the traditional 60 minutes to 15 minutes, resulting in a 60% reduction in annual maintenance costs.

[0064] Expanded application scope: The corrosion-resistant particles 16 of the scale inhibitor membrane 15 and the chemical-resistant design of the sealing strip 18 enable the flow meter to be used with corrosive media with pH values ​​of 3-11, expanding the application scope by 40% compared to traditional electromagnetic flow meters (pH values ​​of 5-9).

[0065] Specifically, a comparison of relevant test data and practical application data for this solution.

[0066] Test Project Traditional electromagnetic flowmeter This utility model flow meter Increase 90-day electrode surface scale thickness (μm) 40 23 42.5％ Scale thickness on the inner wall of the outlet (μm) 35 22 37.1％ Measurement error (%) at a flow velocity of 0.5 m / s ±1.2 ±0.4 66.7％ Measurement error (%) at a flow velocity of 10 m / s ±0.9 ±0.5 44.4％ Maintenance time per session (minutes) 60 15 75.0％ Corrosion resistance (applicable pH range) 5-9 3-11 40.0％

[0067] Data Description

[0068] The experimental medium was hard water (Ca). 2+ +Mg 2+ Concentration 500 mg / L) and weakly corrosive solutions (sulfuric acid solution with pH = 4);

[0069] The measurement error was calibrated using a standard flow meter, and the average value was taken after 10 repeated measurements.

[0070] The scale thickness was measured using an ultrasonic thickness gauge, and the average value was taken from three different locations.

[0071] Data Validity

[0072] The experimental sample size consisted of 3 conventional flow meters and 3 flow meters of this utility model, and the deviation of the parallel experimental results was less than 5%.

[0073] The ambient temperature (25±2℃) and pressure (0.6±0.05MPa) were kept stable during the test to eliminate environmental interference.

[0074] Maintenance time is performed by professional operators according to standard procedures, and average values ​​are recorded to ensure objectivity.

[0075] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. An electromagnetic flowmeter with anti-scaling function, comprising a housing (1), characterized in that: A sealing joint (2) is provided at the top of the housing (1). A converter (3) is connected to the housing (1) through the sealing joint (2). A display screen (4) is provided at the converter (3). An electrode (9) is electrically connected to the middle position inside the housing (1). Excitation coils (5) are installed above and below the inner wall of the housing (1). The left side of the housing (1) is the inlet (7), and the right side of the housing (1) is the outlet (13). An anti-scaling plate (6) is installed at the inlet (7), and a turbine (12) is installed at the outlet (13).

2. The electromagnetic flowmeter with anti-scaling function according to claim 1, characterized in that: Two sets of excitation coils (5) are provided. The excitation coils (5) are semi-arc-shaped and the two sets of excitation coils (5) are symmetrically distributed about the electrode (9).

3. The electromagnetic flowmeter with anti-scaling function according to claim 2, characterized in that: The anti-scaling plate (6) is shaped to match the inner wall of the inlet (7). A slot (14) is provided in the anti-scaling plate (6). An anti-scaling membrane (15) is embedded in the anti-scaling plate (6) through the slot (14). A wall groove (17) is provided at the top of the inlet (7).

4. An electromagnetic flowmeter with anti-scaling function according to claim 3, characterized in that: The top of the scale inhibitor membrane (15) is welded with a sealing strip (18), the arc of the sealing strip (18) fits the outer wall of the inlet (7), and the sealing strip (18) is fixedly connected to the outer wall of the inlet (7) by screws (19).

5. An electromagnetic flowmeter with anti-scaling function according to claim 4, characterized in that: The scale inhibitor membrane (15) has a flat bottom and is filled with particles (16).

6. An electromagnetic flowmeter with anti-scaling function according to claim 5, characterized in that: The inner wall of the inlet (7) near the excitation coil (5) is machined with a step (8), and the anti-scalding plate (6) abuts against the step (8).

7. An electromagnetic flowmeter with anti-scaling function according to claim 6, characterized in that: A locking block (10) is machined in the middle of the inner wall of the outlet (13), and a locking groove (11) is opened at the top and bottom of the edge of the turbine (12). The locking block (10) is engaged and fixed with the locking groove (11).

8. An electromagnetic flowmeter with anti-scaling function according to claim 7, characterized in that: The cross-section of the card block (10) is a "T" structure, and the size of the turbine (12) is adapted to the outlet (13).

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