Marine electromagnetic flowmeter

Abstract

The utility model discloses a marine electromagnetic flowmeter, including electrode assembly parts, pole shoe, magnetic yoke, fender, fixed plate, coil assembly, side plate, and coil assembly is wound on the coil skeleton by enameled wire and is fixed with glass fiber adhesive tape, install pole shoe on the fixed stud of electrode assembly parts, assemble coil assembly on pole shoe, install magnetic yoke on coil assembly and fix with nut. Pole shoe, coil assembly and magnetic yoke are two, and symmetrically install. Fix with screw on magnetic yoke in horizontal direction with fixed plate, and there is one in left and right, and finally fix magnetic yoke on electrode assembly parts. Weld annular fender on two side plates, form protective housing. The mode of mould frame cooperation magnetic pole shoe is adopted to solve, and enameled wire is wound on cylindrical mould, and the fixing of glass fiber adhesive tape is facilitated, can guarantee the long -term stability of enameled wire, also through the addition of pole shoe, enhance the magnetic field intensity and directionality.

Description

Technical Field

[0001] This utility model relates to electromagnetic induction and material corrosion protection technology, and in particular to a marine electromagnetic flowmeter. Background Technology

[0002] Electromagnetic flow meters are instruments that measure the flow rate of conductive fluids based on the principle of electromagnetic induction, specifically the electromotive force induced when the fluid passes through an external magnetic field. They are widely used in water treatment, water supply, and drainage. Because they have no obstructing or moving parts, electromagnetic flow meters can operate stably for extended periods in various environments. However, marine applications, due to the special nature of their environment—operating for extended periods in high-salt-spray conditions and constantly oscillating—can cause conventional electromagnetic flow meters to exhibit the following issues:

[0003] Firstly, traditional electromagnetic flowmeters use carbon steel protective plates and flanges to form a closed and stable magnetic circuit. The product surface is coated with anti-corrosion paint, such as epoxy paint or polyurethane paint, which provides good anti-corrosion in most cases. However, in marine applications, salt spray corrosion is more severe, and the corrosive environment is always present. Therefore, the surface coating peels off severely, ultimately leading to product damage.

[0004] Secondly, the coil fixing method is traditionally designed using fiberglass tape in conjunction with a positioning frame for coil positioning and fixing. However, the directionality and stability of the magnetic circuit are easily affected, and the coil is prone to loosening during long-term operation, resulting in a decrease in accuracy.

[0005] Based on the above reasons, the design fundamentally solves the problems of product corrosion resistance, coil fixing, and stability, which can greatly improve the product's usability and long-term stability.

[0006] In view of the above, this utility model is hereby proposed. Utility Model Content

[0007] The purpose of this invention is to provide a marine electromagnetic flowmeter to solve the aforementioned technical problems in the prior art.

[0008] The objective of this utility model is achieved through the following technical solution:

[0009] The marine electromagnetic flowmeter of this utility model includes an electrode assembly, an electrode shoe 2, a magnetic yoke 3, a protective plate 4, a fixing plate 5, a coil assembly, and a side plate. The coil assembly is made of enameled wire wound on a coil frame 1 and fixed with fiberglass tape.

[0010] Install the pole shoe 2 onto the fixing stud of the electrode assembly component;

[0011] Assemble the coil assembly onto the pole shoe 2;

[0012] Install the yoke 3 onto the coil assembly and secure it with a nut.

[0013] Compared with the prior art, the marine electromagnetic flowmeter provided by this utility model allows the enameled wire to be wound on a cylindrical mold, which facilitates the fixing of the glass fiber tape and ensures the long-term stability of the enameled wire. Furthermore, the addition of pole shoes enhances the magnetic field strength and directionality. Attached Figure Description

[0014] Figure 1 A partial sectional view of the side of the marine electromagnetic flowmeter provided in this embodiment of the utility model;

[0015] Figure 2 A schematic diagram of the cross-sectional structure of the end face of the marine electromagnetic flowmeter provided in this embodiment of the utility model;

[0016] Figure 3 is a schematic diagram of the coil frame of an embodiment of this utility model;

[0017] Figure 4 is a schematic diagram of the pole shoe of an embodiment of this utility model;

[0018] Figure 5 is a schematic diagram of the magnetic yoke of an embodiment of this utility model;

[0019] Figures 6 and 7 are schematic diagrams of the side and end faces of the converter housing according to an embodiment of the present invention, respectively.

[0020] Figure 8 is a schematic diagram of the electrode assembly components according to an embodiment of the present invention;

[0021] Figure 9 is a schematic diagram of the fixing plate in an embodiment of this utility model;

[0022] In the picture:

[0023] 1-Coil frame; 2-Pole shoe (carbon steel); 3-Magnetic yoke (carbon steel); 4-Sheath (316L material); 5-Fixing plate (carbon steel); 6-Conduit (316L); 7-Flange (316L); 8-Liner (PTFE); 9-Electrode holder; 10-Isolation ring; 11-Threaded joint; 12-Butterfly spring; 13-Electrode. Detailed Implementation

[0024] 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, which do not constitute a limitation on the present utility model. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0025] First, the following explanations are provided for the terms that may be used in this article:

[0026] The terms "comprising," "including," "containing," "having," or other similar semantic descriptions should be interpreted as non-exclusive inclusion. For example, including a technical feature element (such as raw material, component, ingredient, carrier, dosage form, material, size, part, component, mechanism, device, step, process, method, reaction conditions, processing conditions, parameter, algorithm, signal, data, product or article of manufacture, etc.) should be interpreted as including not only the expressly listed technical feature element, but also other technical feature elements that are not expressly listed and are well-known in the art.

[0027] The term "composed of" excludes any technical features not expressly listed. When used in a claim, it closes the claim to exclude all technical features other than those expressly listed, except for associated conventional impurities. If the term appears only in a clause of a claim, it limits the claim to the elements expressly listed in that clause; elements recited in other clauses are not excluded from the overall claim.

[0028] Unless otherwise explicitly specified or limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this document according to the specific circumstances.

[0029] The terms “center,” “longitudinal,” “lateral,” “length,” “width,” “thickness,” “upper,” “lower,” “front,” “back,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” “outer,” “clockwise,” and “counterclockwise” indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience and simplification of description and do not imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this document.

[0030] The contents not described in detail in the embodiments of this utility model are existing technologies known to those skilled in the art. Where specific conditions are not specified in the embodiments of this utility model, they shall be performed according to conventional conditions in the art or conditions recommended by the manufacturer. Reagents or instruments used in the embodiments of this utility model whose manufacturers are not specified are all conventional products that can be purchased commercially.

[0031] The marine electromagnetic flowmeter of this utility model includes an electrode assembly, an electrode shoe 2, a magnetic yoke 3, a protective plate 4, a fixing plate 5, a coil assembly, and a side plate. The coil assembly is made of enameled wire wound on a coil frame 1 and fixed with fiberglass tape.

[0032] Install the pole shoe 2 onto the fixing stud of the electrode assembly component;

[0033] Assemble the coil assembly onto the pole shoe 2;

[0034] Install the yoke 3 onto the coil assembly and secure it with a nut.

[0035] The pole shoe 2, coil assembly and magnetic yoke 3 are all in pairs, installed symmetrically from top to bottom.

[0036] Fix the fixing plate 5 horizontally to the magnetic yoke 3 with screws, one on each side, and finally fix the magnetic yoke 3 to the electrode assembly component.

[0037] The annular protective plate 4 is welded to the two side plates to form a protective shell.

[0038] The coil assembly adopts a saddle-shaped structure.

[0039] The thickness of the anti-corrosion paint on the outside of the protective shell is 100µm.

[0040] In summary, the marine electromagnetic flowmeter of this utility model, including coil fixing and magnetic circuit modification, ultimately solves the problems of corrosion prevention and stability. Magnetic circuit induction is guided by Ampere's law (right-hand screw law), and signal generation and acquisition are completed through magneto-electric conversion.

[0041] To more clearly demonstrate the technical solution and effects provided by this utility model, the following detailed description of the embodiments of this utility model is provided with reference to specific examples.

[0042] Example 1

[0043] like Figure 1 As shown in Figure 9:

[0044] 1. Coil Design

[0045] Electromagnetic flowmeter coils typically employ a saddle-shaped design. During winding, the enameled wire is wound into a regular rectangle using tooling, and then fiberglass tape is used to wrap and fix the rectangular coil to prevent the enameled wire from loosening.

[0046] To address the directional and instability issues caused by this type of coil design, a mold structure combined with magnetic pole shoes is used in the design. With this design, the enameled wire is wound on a cylindrical mold, which facilitates the fixation of the fiberglass tape and ensures the long-term stability of the enameled wire. Furthermore, the addition of pole shoes enhances the magnetic field strength and directionality.

[0047] 2. Corrosion-resistant design

[0048] Marine electromagnetic flowmeters operate in a salt spray environment. The salt spray corrodes the anti-corrosion paint on the product surface. The thickness of the anti-corrosion paint is generally around 100µm. Increasing or decreasing the thickness will not bring about a significant improvement in anti-corrosion performance and may even reduce the anti-corrosion performance.

[0049] Therefore, this solution considered the corrosion resistance of the material itself and ultimately selected SUS316L material through data query. This change in material had a significant negative impact on the sensor's magnetic circuit because carbon steel has high magnetic permeability, which can effectively protect the coil's magnetic field, preventing magnetic field exposure and interference from external magnetic fields. SUS316L material has lower magnetic permeability and cannot achieve the same effect as carbon steel.

[0050] To address this, a magnetic yoke with better magnetic permeability was added for protection, thus achieving the desired effect.

[0051] like Figure 1 , Figure 2 The structural diagram shows the function of each component:

[0052] 1-Coil frame: The enameled wire is wound in a circular shape, which facilitates fixation with fiberglass tape and ensures stability during long-term use;

[0053] 2-Pole shoe (carbon steel): Positions the coil and enhances the magnetic field;

[0054] 3-Magnetic yoke (carbon steel): Forms a loop in the magnetic circuit, stabilizing the magnetic field;

[0055] 4-Protective plate (316L material): Used to protect internal electrical wiring and provide internal and external isolation.

[0056] 5-Fixing plate (carbon steel): Fixes the magnetic yoke, using screw fastening.

[0057] 6-Cavity (316L): Used for fluid channels.

[0058] 7-Flange (316L): Flange for connecting field pipelines.

[0059] 8- Lining (PTFE): Used to isolate the medium from the conduit, providing insulation.

[0060] 9-Electrode holder: Used to position the electrodes and shield them from external interference.

[0061] 10-Isolation ring: Used for electrical isolation of electrodes, isolating the disc spring from the electrode holder.

[0062] 11-Threaded connector: Used for electrical isolation of electrodes, isolating the electrode from the electrode holder.

[0063] 12-Butterfly spring: Used to prevent electrodes from loosening and to compensate for the thermal expansion and contraction of the lining caused by high and low temperature media.

[0064] 13-Electrode: Used to collect the induced electromotive force generated by electromagnetic fields.

[0065] Specifically, the assembly process for the relevant parts is as follows:

[0066] 1) As shown in Figure 8, the electrode assembly component consists of the coil frame 1, pole shoe 2, magnetic yoke 3, and protective plate 4 without the parts installed.

[0067] 2) First, wind 980 turns of enameled wire around coil bobbin 1 according to the design requirements, and fix it with fiberglass tape. Test and record the corresponding DC resistance value, which is approximately 25Ω@25℃. Wind two coil assemblies for later use.

[0068] 3) Install the pole shoe 2 onto the electrode assembly component in Figure 8, with one on the top and one on the bottom of the electrode assembly component.

[0069] 4) Assemble the wound coil assembly onto the pole shoe 2.

[0070] 5) Install the magnetic yoke 3 onto the coil assembly and secure it with a nut. All parts, including the pole shoe, coil assembly, and magnetic yoke, are installed symmetrically from top to bottom.

[0071] 6) Fix the fixing plate 5 to the magnetic yoke 3 in the horizontal direction with screws, one on each side. Finally, fix the magnetic yoke 3 to the electrode assembly to complete the magnetic field circuit assembly.

[0072] 7) Weld the guard plate 4 to the side plate to provide protection.

[0073] The performance tests of the molded products are shown in Table 1:

[0074]

[0075] The above description is merely a preferred embodiment of this utility model, but the scope of protection of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this utility model should be included within the scope of protection of this utility model. Therefore, the scope of protection of this utility model should be determined by the scope of the claims. The information disclosed in the background section is intended only to enhance the understanding of the overall background technology of this utility model and should not be construed as an admission or implication in any way that such information constitutes prior art known to those skilled in the art.

Claims

1. A marine electromagnetic flowmeter, characterized in that, It includes electrode assembly components, pole shoes (2), magnetic yoke (3), protective plate (4), fixing plate (5), coil assembly, and side plate. The coil assembly is made of enameled wire wound on the coil frame (1) and fixed with glass fiber tape. Install the pole shoe (2) onto the fixing stud of the electrode assembly component; The coil assembly is mounted on the pole shoe (2); Install the yoke (3) onto the coil assembly and secure it with a nut.

2. The marine electromagnetic flowmeter according to claim 1, characterized in that, The pole shoe (2), coil assembly and magnetic yoke (3) are all in pairs, installed symmetrically on top and bottom.

3. The marine electromagnetic flowmeter according to claim 2, characterized in that, Fix the fixing plate (5) to the magnetic yoke (3) in the horizontal direction with screws, one on each side, and finally fix the magnetic yoke (3) to the electrode assembly component.

4. The marine electromagnetic flowmeter according to claim 3, characterized in that, The annular protective plate (4) is welded to the two side plates to form a protective shell.

5. The marine electromagnetic flowmeter according to claim 4, characterized in that, The thickness of the anti-corrosion paint on the outside of the protective shell is 100µm.

6. The marine electromagnetic flowmeter according to any one of claims 1 to 5, characterized in that, The coil assembly adopts a saddle-shaped structure.

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