Large-bore electromagnetic flowmeter

Abstract

The utility model discloses a big pipe diameter electromagnetic flowmeter relates to electromagnetic flowmeter technical field, including flowmeter pipe mechanism, the outside screw of flowmeter pipe mechanism is connected with electromagnetic flow measurement mechanism, and the outer end welding of electromagnetic flow measurement mechanism is provided with electromagnetic flow display mechanism, the utility model solves the big pipe diameter electromagnetic flowmeter of existing and adopts the mode of double electrode to gather potential signal, under the condition that big pipe diameter internal flow rate is uneven, signal accuracy is poor, and needs optimization to ensure the problem of uniformity of magnetic field, the utility model through the whole surrounding setting of excitation coil subassembly and seal pressure ring in electromagnetic flow measurement mechanism, makes the magnetic field concentrate in the pipeline center area, and the edge effect is smaller, through the opposite setting of four groups of electrode subassembly two two, respectively located in the vertical plane range, covers the pipeline diameter direction, realizes multi -parameter measurement, and the measurement deviation brought by asymmetric flow field is coped with, and through multidimensional capture flow field information improves flow calculation accuracy.

Description

Technical Field

[0001] This utility model relates to the field of electromagnetic flowmeter technology, specifically a large-diameter electromagnetic flowmeter. Background Technology

[0002] With the acceleration of industrialization and the rapid development of large-scale industrial projects such as petrochemicals, power, water treatment, steel, and metallurgy, the demand for flow measurement is constantly increasing, and higher requirements are being placed on the accuracy and stability of the measurement. Under the same flow rate, the larger the pipe diameter, the lower the flow velocity of electromagnetic flowmeters. Furthermore, the flow velocity profile is easily asymmetrical due to pipe bends, valves, and other components, which in turn affects the uniformity of the induced electromotive force.

[0003] The large-diameter electromagnetic flowmeter with authorization announcement number CN223091338U includes a monitoring component, which includes a flow guide tube, magnetic poles, an inner liner, and electrodes. The inner liner is provided on the inner side of the flow guide tube, and magnetic poles are uniformly arranged on the outer side of the inner liner. Electrodes are uniformly fixed inside the flow guide tube outside the inner liner. Existing large-diameter electromagnetic flowmeters use a dual-electrode method to collect potential signals. When the flow velocity inside the large-diameter pipe is uneven, the signal accuracy is poor. In addition, the cross-section of the measuring tube in a large-diameter pipe is larger, making it more difficult to generate a magnetic field. Optimization is needed to ensure a uniform magnetic field.

[0004] To address the aforementioned issues, a large-diameter electromagnetic flowmeter is proposed. Utility Model Content

[0005] The purpose of this invention is to provide a large-diameter electromagnetic flowmeter that solves the problems of existing large-diameter electromagnetic flowmeters in the background art, which use a dual-electrode method to collect potential signals, resulting in poor signal accuracy when the flow velocity inside the large-diameter pipe is uneven. Furthermore, the cross-section of the measuring pipe in a large-diameter pipe is larger, making it more difficult to generate a magnetic field, and optimization is needed to ensure a uniform magnetic field.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a large-diameter electromagnetic flowmeter, comprising a flowmeter tube mechanism, an electromagnetic flow measurement mechanism connected by screws to the outer side of the flowmeter tube mechanism, an electromagnetic flow display mechanism welded to the outer end of the electromagnetic flow measurement mechanism, the flowmeter tube mechanism including a measuring pipe, a central isolation ring fixedly disposed in the middle of the measuring pipe, two sets of electromagnetic flow measurement mechanisms arranged side by side, the two sets of electromagnetic flow measurement mechanisms being orthogonally perpendicular, each electromagnetic flow measurement mechanism including two sets of excitation coil assemblies symmetrically arranged and sleeved on the side of the measuring pipe, a sealing ring pressed onto the outer side of the excitation coil assembly, an electrode assembly inserted into the side end of the sealing ring, the sealing ring pressing and fixing the electrode assembly from both sides, a total of four sets of electrode assemblies are provided in the two sets of orthogonally perpendicular electromagnetic flow measurement mechanisms, the four sets of electrode assemblies forming a vertical double-plane four-electrode configuration.

[0007] Preferably, the flow meter tube mechanism further includes external flanges fixedly disposed on both sides of the measuring pipe, and the inner wall of the measuring pipe is fitted with a lining.

[0008] Preferably, the side end of the measuring pipe is fixedly provided with a magnetic field fixing screw for inserting the excitation coil assembly, and a sealing plate for inserting into the side end of the measuring pipe, and the electrode assembly is inserted into the sealing plate.

[0009] Preferably, the excitation coil assembly includes a silicon steel sheet core inserted into a magnetic field fixing screw, and a saddle-shaped coil is arranged around the silicon steel sheet core.

[0010] Preferably, the sealing ring has pressure grooves on both sides.

[0011] Preferably, the electromagnetic flow measurement mechanism further includes a nut that is screwed to one side of the magnetic field fixing screw.

[0012] Preferably, the electrode assembly includes an electrode measuring rod inserted into a measuring pipe, and one end of the electrode measuring rod is connected to an electric wire.

[0013] Preferably, the electromagnetic flow display mechanism includes a housing welded to the outside of the measuring pipe, a display disposed on one side of the housing, and a component flange provided at the connection between the housing and the display.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. The present invention provides a large-diameter electromagnetic flowmeter, which, through the complete encirclement of the excitation coil assembly and the sealing ring in the electromagnetic flow measurement mechanism, allows for a relatively long straight pipe length at both ends of the measuring pipe. The excitation coil assembly is tightly attached to the outer wall of the measuring pipe, and the sealing ring is used to press the excitation coil assembly, so that the magnetic field is concentrated in the central area of ​​the pipe with less edge effect. This solves the problem that existing large-diameter electromagnetic flowmeters have large cross-sections of measuring pipes, making magnetic field generation more difficult and requiring optimization to ensure magnetic field uniformity.

[0015] 2. The large-diameter electromagnetic flowmeter provided by this utility model uses four sets of electrode assemblies arranged in pairs, located in the vertical plane, covering the pipe diameter direction, to achieve multi-parameter measurement, cope with the measurement deviation caused by asymmetric flow fields, and improve the flow calculation accuracy by capturing flow field information in multiple dimensions. It solves the problem of poor signal accuracy in existing large-diameter electromagnetic flowmeters that use dual electrodes to collect potential signals when the flow velocity inside the large-diameter pipe is uneven. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall side view structure of this utility model; Figure 2 This is a schematic diagram of the overall structure of the present invention. Figure 1 ; Figure 3 This is a schematic diagram of the overall structure of the present invention. Figure 2 ; Figure 4 This is a schematic diagram of the electromagnetic flow measurement mechanism of this utility model; Figure 5 This is a schematic diagram showing the disassembled structure of the electromagnetic flow measurement mechanism of this utility model.

[0017] In the diagram: 1. Flow meter tube mechanism; 11. Measuring pipe; 111. Magnetic field fixing screw; 112. Sealing plate; 12. External flange; 13. Lining; 14. Centered isolation ring; 2. Electromagnetic flow measurement mechanism; 21. Excitation coil assembly; 211. Silicon steel sheet core; 212. Saddle-shaped coil; 22. Sealing ring; 221. Pressure groove; 23. Nut; 24. Electrode assembly; 241. Electrode measuring rod; 242. Wire; 3. Electromagnetic flow display mechanism; 31. Housing; 32. Display; 33. Component flange. Detailed Implementation

[0018] 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.

[0019] To further understand the content of this utility model, a detailed description of this utility model will be provided in conjunction with the accompanying drawings.

[0020] Combination Figure 1 This utility model discloses a large-diameter electromagnetic flowmeter, including a flowmeter tube mechanism 1. An electromagnetic flow measurement mechanism 2 is screwed to the outside of the flowmeter tube mechanism 1. An electromagnetic flow display mechanism 3 is welded to the outer end of the electromagnetic flow measurement mechanism 2. The flowmeter tube mechanism 1 includes a measuring pipe 11. A central isolation ring 14 is fixedly installed in the middle of the measuring pipe 11. Two sets of electromagnetic flow measurement mechanisms 2 are arranged side by side and are orthogonally perpendicular. The electromagnetic flow measurement mechanism 2 includes two sets of excitation coil assemblies 21 that are symmetrically arranged on the side of the measuring pipe 11. A sealing ring 22 is pressed onto the outside of the excitation coil assembly 21. An electrode assembly 24 is inserted into the side end of the sealing ring 22. The sealing ring 22 presses and fixes the electrode assembly 24 from both sides. A total of four sets of electrode assemblies 24 are arranged in the two sets of orthogonally perpendicular electromagnetic flow measurement mechanisms 2, which constitute a vertical double-plane four-electrode configuration.

[0021] Specifically, the measuring pipe 11 and the central isolation ring 14 are fixed to each other, with the central isolation ring 14 positioned in the center. The straight pipe lengths of the front and rear sections of the measuring pipe 11 are reserved to be relatively long. The excitation coil assembly 21 is tightly attached to the outer wall of the measuring pipe 11, so that the magnetic field is concentrated in the central area of ​​the pipe, with a small edge effect. The sealing ring 22 is used to press the excitation coil assembly 21 and simultaneously engage the pressing electrode assembly 24. The four sets of electrode assemblies 24 are arranged in pairs opposite each other, located in the vertical plane, covering the pipe diameter direction, to realize multi-parameter measurement and cope with the measurement deviation caused by the asymmetric flow field. By capturing flow field information in multiple dimensions, the accuracy of flow calculation is improved. This electromagnetic flowmeter integrates an electromagnetic flow calculation system. The electromagnetic flow calculation system first extracts the effective flow velocity component through preprocessing, and then selects an appropriate algorithm based on the flow field characteristics such as symmetry, asymmetry, and vortex, such as arithmetic mean, weighted average, and vector synthesis, to finally obtain the average flow velocity that reflects the real flow field, and then calculates the flow rate.

[0022] The present invention will be further described below with reference to the embodiments.

[0023] Example 1: Combination Figures 2-5The flow meter tube mechanism 1 also includes external flanges 12 fixedly installed on both sides of the measuring pipe 11. The inner wall of the measuring pipe 11 is fitted with a lining 13. The external flanges 12 are used to connect external pipes. The lining 13 is made of polytetrafluoroethylene material to increase corrosion resistance.

[0024] A magnetic field fixing screw 111 for inserting the excitation coil assembly 21 is fixedly provided on the side end of the measuring pipe 11. A sealing plate 112 is inserted into the side end of the measuring pipe 11. The electrode assembly 24 is inserted into the sealing plate 112. The magnetic field fixing screw 111 is used to fix and position the excitation coil assembly 21. The sealing plate 112 and the sealing ring 22 are used to position and sleeve the electrode assembly 24.

[0025] The excitation coil assembly 21 includes a silicon steel sheet core 211 inserted into the magnetic field fixing screw 111. A saddle-shaped coil 212 is arranged around the silicon steel sheet core 211. The silicon steel sheet core 211 is used to concentrate magnetic lines of force and reduce eddy current losses. Under the sleeve action of the silicon steel sheet core 211, the saddle-shaped coil 212 forms a saddle shape, which facilitates the concentration of the magnetic field in the central area of ​​the pipe.

[0026] The sealing ring 22 has pressure grooves 221 on both sides. The pressure grooves 221 are used to position and fix the electrode assembly 24, keeping the electrode assembly 24 on the diameter line of the pipe.

[0027] The electromagnetic flow measurement mechanism 2 also includes a nut 23 screwed to one side of the magnetic field fixing screw 111. The nut 23 is screwed along the sealing plate 112 and is used to press the sealing ring 22.

[0028] The electrode assembly 24 includes an electrode measuring rod 241 inserted into the measuring pipe 11. One end of the electrode measuring rod 241 is connected to a wire 242. The probe at one end of the electrode measuring rod 241 has a larger diameter. The electrode measuring rod 241 is inserted into the sealing plate 112 and is sleeved and fixed with the pressure groove 221. The nut 23 is screwed to the electrode measuring rod 241 to achieve side-end fixation. The wire 242 is connected to the electromagnetic flow display mechanism 3.

[0029] Example 2: Combination Figure 2 and Figure 3 The electromagnetic flow display mechanism 3 includes a housing 31 welded to the outside of the measuring pipe 11, a display 32 disposed on one side of the housing 31, a component flange 33 provided at the connection between the housing 31 and the display 32, the housing 31 encloses the electromagnetic flow measuring mechanism 2, and the component flange 33 is fixed by screws to realize the mutual connection between the display 32 and the housing 31.

[0030] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0031] Although embodiments of the present 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 present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A large-diameter electromagnetic flowmeter, comprising a flowmeter tube mechanism (1), characterized in that: The outer side of the flow meter tube mechanism (1) is screwed to an electromagnetic flow measurement mechanism (2), and an electromagnetic flow display mechanism (3) is welded to the outer end of the electromagnetic flow measurement mechanism (2). The flow meter tube mechanism (1) includes a measuring pipe (11), and a central isolation ring (14) is fixedly installed in the middle of the measuring pipe (11). Two sets of electromagnetic flow measuring mechanisms (2) are arranged side by side. The two sets of electromagnetic flow measuring mechanisms (2) are orthogonally and vertically arranged. The electromagnetic flow measuring mechanism (2) includes two sets of excitation coil assemblies (21) that are symmetrically arranged on the side of the measuring pipe (11). A sealing ring (22) is pressed onto the outside of the excitation coil assembly (21). An electrode assembly (24) is inserted into the side end of the sealing ring (22). The sealing ring (22) presses and fixes the electrode assembly (24) from both sides. A total of four sets of electrode assemblies (24) are arranged in the two sets of orthogonally and vertically arranged electromagnetic flow measuring mechanisms (2). The four sets of electrode assemblies (24) constitute a vertical double-plane four-electrode.

2. The large-diameter electromagnetic flowmeter according to claim 1, characterized in that: The flow meter tube mechanism (1) also includes external flanges (12) fixedly installed on both sides of the measuring pipe (11), and the inner wall of the measuring pipe (11) is fitted with a lining (13).

3. The large-diameter electromagnetic flowmeter according to claim 1, characterized in that: The side end of the measuring pipe (11) is fixedly provided with a magnetic field fixing screw (111) for inserting the excitation coil assembly (21) and a sealing plate (112) for inserting into the side end of the measuring pipe (11), and the electrode assembly (24) is inserted into the sealing plate (112).

4. The large-diameter electromagnetic flowmeter according to claim 3, characterized in that: The excitation coil assembly (21) includes a silicon steel sheet core (211) inserted into a magnetic field fixing screw (111), and a saddle-shaped coil (212) is arranged around the silicon steel sheet core (211).

5. The large-diameter electromagnetic flowmeter according to claim 1, characterized in that: The sealing ring (22) has pressure grooves (221) on both sides.

6. The large-diameter electromagnetic flowmeter according to claim 3, characterized in that: The electromagnetic flow measurement mechanism (2) also includes a nut (23) that is screwed to one side of the magnetic field fixing screw (111).

7. The large-diameter electromagnetic flowmeter according to claim 1, characterized in that: The electrode assembly (24) includes an electrode measuring rod (241) inserted into the measuring pipe (11), one end of which is connected to an electric wire (242).

8. The large-diameter electromagnetic flowmeter according to claim 1, characterized in that: The electromagnetic flow display mechanism (3) includes a housing (31) welded to the outside of the measuring pipe (11), a display (32) on one side of the housing (31), and a component flange (33) provided at the connection between the housing (31) and the display (32).

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