A liquid flow rate measuring device

Abstract

The utility model discloses a liquid flow velocity measuring device, including water drop shape pipe body, magnetic circuit component and electrode, magnetic circuit component is constituted by I -beam core and the cylindrical coil of winding on the central column among them, water drop shape pipe body is water drop shape structure, and the upper and lower sides of electrode are equipped with the flange. I -beam core is fixed in the inside of pipe body, and electrode is installed in the pipe wall and is located in the magnetic field range. The utility model adopts I -beam core cooperation cylindrical coil and constitutes closed magnetic circuit, can form the even steady magnetic field in the electrode area, and water drop shape pipe body design is constituted by half ellipse and semicircle, and is combined with the flange structure of the upper and lower sides of electrode, can effectively guide fluid steady pass, reduces the eddy current and turbulence generation, makes the flow velocity distribution more even. The utility model realizes high -precision measurement, and compact structure, cost controllable can be widely used in water treatment, chemical industry, energy and other industries to the flow measurement requirement higher production control and trade settlement scene, has higher popularization value.

Description

Technical Field

[0001] This utility model belongs to the field of liquid flow measurement technology, and specifically relates to a liquid flow velocity (flow) measurement device based on an insertion electromagnetic flow meter. Background Technology

[0002] In the field of liquid flow measurement, insertion electromagnetic flowmeters are widely used for liquid flow monitoring in various pipelines due to their advantages such as convenient installation and relatively low cost. Currently, conventional insertion electromagnetic flowmeters on the market all operate based on Faraday's law of electromagnetic induction. They collect the induced electromotive force generated on the electrodes when the fluid flows in a magnetic field, and then process the data through secondary instruments to finally obtain the fluid's flow velocity and flow rate.

[0003] Structurally, existing insertion electromagnetic flowmeters typically use a cylindrical or elliptical tube. To generate the magnetic field required for measurement, they are mostly equipped with a cylindrical or rectangular coil and an iron core. When energized, they form a closed magnetic field. At the same time, a pair of electrodes are set on the tube wall within the magnetic field range for collecting the induced electromotive force.

[0004] However, existing technologies have the following obvious drawbacks: 1. Non-uniform magnetic field leads to unstable measurement signal: The closed magnetic field generated by the cylindrical or rectangular coil and the iron core exhibits a non-uniform distribution around the electrodes. According to Faraday's law of electromagnetic induction, the magnitude of the induced electromotive force is related to parameters such as magnetic field strength and fluid flow velocity. A non-uniform magnetic field causes the induced electromotive force generated at the electrodes to fluctuate continuously during the measurement process, failing to stably reflect the true flow velocity of the fluid and directly affecting the measurement accuracy.

[0005] 2. Tube shape causes flow turbulence: When using circular or elliptical tubes with similar major and minor axes, turbulence and eddies are easily generated during fluid flow outside the tube. Turbulent flow leads to uneven distribution of fluid velocity outside the tube, further aggravating fluctuations in induced electromotive force, resulting in a large deviation between the velocity (flow rate) data obtained from secondary instruments and the actual value.

[0006] 3. Low overall measurement accuracy: The combination of the above-mentioned problems of uneven magnetic field and turbulent flow state results in the generally low measurement accuracy of existing insertion electromagnetic flowmeters, which is difficult to meet the needs of production control and trade settlement scenarios with high requirements for flow measurement accuracy. Utility Model Content

[0007] This invention aims to overcome the shortcomings of existing insertion electromagnetic flowmeters, which suffer from low measurement accuracy due to uneven magnetic fields and turbulent flow. By innovating the magnetic circuit structure and device shape, it provides a liquid velocity (flow rate) measuring device that can generate a uniform magnetic field and ensure stable fluid flow, thereby significantly improving measurement accuracy, reducing usage costs, and meeting the high-precision measurement needs of production control and trade settlement scenarios.

[0008] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution: This utility model is a liquid flow rate measuring device, including a teardrop-shaped tube, a magnetic circuit assembly, and electrodes. The magnetic circuit assembly includes an I-shaped iron core and a cylindrical coil wound around the central column of the I-shaped iron core. The teardrop-shaped tube has a teardrop-shaped structure and protruding edges on the upper and lower sides of the electrodes. The I-shaped iron core is fixed inside the teardrop-shaped tube, and the electrodes are fixed on the tube wall of the teardrop-shaped tube and are within the magnetic field range generated by the I-shaped iron core.

[0009] In one embodiment, the I-shaped iron core is made of silicon steel sheet or industrial pure iron and adopts a stacked molding structure.

[0010] In one embodiment, the cylindrical coil is made of enameled wire with a wire diameter of 0.1-0.35mm, 600-3500 turns, and a coil resistance of 8-98Ω. The coil is excited by DC excitation with an excitation current of 100-250mA, an excitation supply voltage of 12-36V, and an excitation frequency of 2.5-25Hz.

[0011] In one embodiment, the cross-section of the teardrop-shaped tube is composed of half an ellipse and half a circle, the major axis of the ellipse is 10-100mm, the diameter of the semicircle is 5-50mm, and the total length of the teardrop-shaped tube is 40-90mm; the material of the teardrop-shaped tube is stainless steel or engineering plastic.

[0012] In one embodiment, the height of the convex edge is 2-15mm, the width is 1-6mm, the distance between the two convex edges is 10-60mm, and the center of the electrode is on the same vertical line as the center of the two convex edges.

[0013] In one embodiment, the electrode is made of 316 or 304 stainless steel or a special corrosion-resistant and wear-resistant material, and is fixed to the wall of the teardrop-shaped tube by riveting. The sensing end of the electrode protrudes 0.2-3mm from the tube wall.

[0014] In one embodiment, the I-shaped iron core is fixed inside the teardrop-shaped tube by a polymer adhesive, and the seam of the outer shell of the teardrop-shaped tube is sealed with a polymer adhesive.

[0015] This utility model has the following beneficial effects: 1. Uniform and stable magnetic field, high measurement accuracy: The use of an I-shaped iron core and a cylindrical coil to form a closed magnetic circuit can create a uniform and stable magnetic field in the electrode area, effectively overcoming the signal fluctuation problem caused by uneven magnetic field distribution in traditional insertion electromagnetic flowmeters, and significantly improving the stability and measurement accuracy of induced electromotive force.

[0016] 2. Stable flow and minimal interference: The teardrop-shaped tube design consists of a semi-ellipse and a semi-circle, combined with the convex edge structure on the upper and lower sides of the electrode, which can effectively guide the fluid to pass smoothly, reduce the generation of eddies and turbulence, and make the flow velocity distribution more uniform, thereby reducing the impact of flow disturbance on the measurement.

[0017] 3. Reliable structure and easy installation and maintenance: The I-shaped iron core is made of laminated silicon steel sheets, and the coil parameters and excitation method have been optimized. The teardrop-shaped tube can be made of stainless steel or engineering plastic according to actual needs. The overall structure is sturdy and corrosion-resistant. The electrodes are fixed by riveting process. The assembly process is mature, the sealing is good, the service life is long, and it is suitable for long-term stable use in industrial sites.

[0018] 4. High applicability and cost-effectiveness: While achieving high-precision measurement, this utility model has a compact structure and controllable cost. It can be widely used in production control and trade settlement scenarios with high requirements for flow measurement in industries such as water treatment, chemical industry, and energy, and has high promotion value.

[0019] Of course, any product implementing this utility model does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the overall structure of a liquid flow velocity measuring device; Figure 2 This is a front view of a liquid flow rate measuring device; Figure 3 for Figure 2 Sectional view of AA in the middle; Figure 4 An insertion electromagnetic flowmeter for installing liquid flow rate measurement devices.

[0022] The attached diagram lists the components represented by each number as follows: 1. I-shaped iron core; 2. Cylindrical coil; 3. Teardrop-shaped tube; 4. Electrode; 5. Convex edge. Detailed Implementation

[0023] 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.

[0024] In the description of this utility model, it should be understood that the terms "upper", "middle", "outer", "inner", etc., which indicate orientation or positional relationship, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0025] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0026] Example 1

[0027] Please see Figures 1-4 As shown, this utility model is a liquid flow rate measuring device, including a teardrop-shaped tube 3, a magnetic circuit assembly and an electrode 4. The magnetic circuit assembly includes an I-shaped iron core 1 and a cylindrical coil 2 wound on the central column of the I-shaped iron core 1. The teardrop-shaped tube 3 has a teardrop-shaped structure and protruding edges 5 are provided on the upper and lower sides of the electrode 4 respectively. The I-shaped iron core 1 is fixed inside the teardrop-shaped tube 3, and the electrode 4 is fixed on the tube wall of the teardrop-shaped tube 3 and is within the magnetic field range generated by the I-shaped iron core 1.

[0028] Furthermore, the I-shaped iron core 1 is made of silicon steel sheet or industrial pure iron material and adopts a stacked molding structure.

[0029] Furthermore, the cylindrical coil 2 is made of enameled wire with a wire diameter of 0.1-0.35mm, a coil number of 600-3500 turns, and a coil resistance of 8-98Ω; the coil is excited by DC excitation with an excitation current of 100-250mA, an excitation power supply voltage of 12-36V, and an excitation frequency of 2.5-25Hz.

[0030] Furthermore, the cross-section of the teardrop-shaped tube 3 is composed of half an ellipse and half a circle. The major axis of the ellipse is 10-100mm, the diameter of the semicircle is 5-50mm, and the total length of the teardrop-shaped tube 3 is 40-90mm. The material of the teardrop-shaped tube 3 is stainless steel or engineering plastic.

[0031] Furthermore, the height of the convex edge 5 is 2-15mm, the width is 1-6mm, the distance between the two convex edges 5 is 10-60mm, and the center of the electrode 4 and the center of the two convex edges 5 are on the same vertical line.

[0032] Furthermore, electrode 4 is made of 316 or 304 stainless steel or special corrosion-resistant and wear-resistant materials, and is fixed to the wall of the teardrop-shaped tube 3 by riveting process, with the sensing end of electrode 4 protruding 0.2-3mm from the tube wall.

[0033] Furthermore, the I-shaped iron core 1 is fixed inside the teardrop-shaped tube 3 by a polymer adhesive, and the seam of the outer shell of the teardrop-shaped tube 3 is sealed with a polymer adhesive.

[0034] Example 2

[0035] 1. Component parameter selection I-shaped iron core 1: Made of Baosteel B35A230 silicon steel sheets, the central column is 5mm wide, 36.2mm high and 12.4mm thick. The dimensions of the upper and lower yokes match the central column to ensure that the magnetic circuit is closed and the magnetic field is uniform.

[0036] Cylindrical coil 2: Select self-adhesive enameled wire with a wire diameter of 0.2mm, wind 2350 turns, coil resistance of 46Ω, and wind it on the center column of the I-shaped iron core 1. The two ends of the coil are connected to the external excitation power supply through wires. The excitation current is 100-250mA, the excitation voltage is 12-36V, and the excitation frequency is 2.5-25Hz.

[0037] Teardrop-shaped tube 3: Made of engineering plastic, the cross-section consists of a semi-ellipse (major axis 33mm) and a semi-circle (diameter 16.5mm), with a total length of 72mm and a wall thickness of 3mm, ensuring structural strength and corrosion resistance.

[0038] Electrode 4: Made of 316 or 304 stainless steel or special corrosion-resistant and wear-resistant material, with a diameter of 5mm, it is fixed to the tube wall by riveting process. The electrode sensing end protrudes 0.3mm from the tube wall and is located between two convex edges. The convex edges are 8.8mm high, 3mm wide, and 35mm apart.

[0039] Sealing and fixing: The joints of the outer shell of the pipe are sealed with epoxy resin polymer adhesive, and the I-shaped iron core 1 is fixed inside the pipe with the same type of adhesive to ensure a firm assembly and no liquid leakage.

[0040] 2. Assembly process First, the I-shaped iron core 1 is pre-treated by stacking Baosteel B35A230 silicon steel sheets according to the design dimensions to ensure that the dimensional accuracy of the iron core meets the requirements. A winding machine was used to wind 2350 turns of 0.2mm self-adhesive enameled wire on the center post of the I-shaped iron core 1. During the winding process, the winding tension was controlled to be uniform to avoid the coil from becoming loose. After the winding was completed, the coil resistance was measured to ensure that it was about 46Ω. The teardrop-shaped tube 3 is processed, including tube forming, electrode mounting hole opening, and protrusion edge welding (using laser welding technology to ensure a firm connection between the protrusion edge and the tube body). Electrode 4 is installed at the electrode mounting hole of the tube body by riveting. The riveting pressure is controlled at 1-5MPa to ensure that electrode 4 is tightly connected to the tube body without loosening. An epoxy resin polymer adhesive is used to fix the I-shaped iron core 1 with the assembled coil inside the teardrop-shaped tube 3. The fixed position ensures that the magnetic field generated by the coil can completely cover the electromagnetic induction area. Apply epoxy resin adhesive to the joints of the pipe shell to seal it, and let it cure at 80℃ for 2 hours to ensure a good seal. After assembly, the device undergoes visual inspection, dimensional verification, and sealing test (using water pressure test, test pressure 1.6MPa, pressure held for 30 minutes, no leakage is considered qualified).

[0041] It should be further noted that this device is installed within an insertion-type electromagnetic flowmeter and is connected and debugged with other components of the flowmeter. The electrodes of the liquid flow rate measuring device are reliably connected to the secondary instrument of the flowmeter via wires to ensure stable signal transmission. During connection, attention should be paid to the insulation of the wires to avoid signal interference. Simultaneously, the cylindrical coil is connected to the external excitation power supply, and the connection is checked for secureness to prevent unstable excitation due to poor contact.

[0042] After connection, power on the entire insertion electromagnetic flowmeter for testing. Observe the display of the secondary instrument to check whether it can normally acquire the electromotive force signal induced by the electrodes and accurately calculate the fluid velocity and flow rate. If any abnormality is found in the display, promptly check the connection of each component of the device, the excitation parameters of the coil, and the induction status of the electrodes.

[0043] After successful testing, the insertion electromagnetic flowmeter with the liquid flow rate measurement device installed is then installed on the pipeline where liquid flow monitoring is required. During installation, ensure a tight seal between the device and the pipeline to prevent liquid leakage. Simultaneously, ensure the device is correctly positioned within the pipeline so that the fluid can flow smoothly through the teardrop-shaped tube for optimal measurement results.

[0044] After installation, the device undergoes comprehensive commissioning and calibration again. Based on the actual measured liquid characteristics and pipeline conditions, the parameters of the secondary instruments are adjusted to ensure more accurate and reliable measurement results. Regular maintenance and inspection of the device are also essential, including checking electrode wear, coil insulation performance, and pipe corrosion, to promptly identify and resolve potential problems and ensure long-term stable operation, providing accurate liquid flow measurement data for production control and trade settlement scenarios.

[0045] In the description of this specification, references to terms such as "an embodiment," "example," and "specific example" indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0046] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A liquid flow rate measuring device, comprising a teardrop-shaped tube (3), a magnetic circuit assembly, and electrodes (4), characterized in that: The magnetic circuit assembly includes an I-shaped iron core (1) and a cylindrical coil (2) wound on the central column of the I-shaped iron core (1). The teardrop-shaped tube (3) has a teardrop-shaped structure and protruding edges (5) are provided on the upper and lower sides of the electrode (4). The I-shaped iron core (1) is fixed inside the teardrop-shaped tube (3), and the electrode (4) is fixed on the tube wall of the teardrop-shaped tube (3) and is within the magnetic field range generated by the I-shaped iron core (1).

2. The liquid flow rate measuring device according to claim 1, characterized in that, The I-shaped iron core (1) is made of silicon steel sheet or industrial pure iron material and adopts a stacked molding structure.

3. The liquid flow rate measuring device according to claim 1, characterized in that, The cylindrical coil (2) is made of enameled wire with a wire diameter of 0.1-0.35mm, a coil number of 600-3500 turns, and a coil resistance of 8-98Ω. The coil is excited by DC excitation with an excitation current of 100-250mA, an excitation power supply voltage of 12-36V, and an excitation frequency of 2.5-25Hz.

4. The liquid flow rate measuring device according to claim 1, characterized in that, The cross-section of the teardrop-shaped tube (3) consists of half an ellipse and half a circle. The major axis of the ellipse is 10-100mm, the diameter of the semicircle is 5-50mm, and the total length of the teardrop-shaped tube (3) is 40-90mm. The teardrop-shaped tube (3) is made of stainless steel or engineering plastic.

5. A liquid flow rate measuring device according to claim 1, characterized in that, The height of the convex edge (5) is 2-15mm and the width is 1-6mm. The distance between the two convex edges (5) is 10-60mm. The center of the electrode (4) and the center of the two convex edges (5) are on the same vertical line.

6. The liquid flow rate measuring device according to claim 1, characterized in that, The electrode (4) is made of 316 or 304 stainless steel and is fixed to the wall of the teardrop-shaped tube (3) by riveting process. The sensing end of the electrode (4) protrudes 0.2-3mm from the tube wall.

7. The liquid flow rate measuring device according to claim 1, characterized in that, The I-shaped iron core (1) is fixed inside the teardrop-shaped tube (3) by a polymer adhesive, and the seam of the outer shell of the teardrop-shaped tube (3) is sealed with a polymer adhesive.

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