Excitation module and electromagnetic flowmeter

Abstract

The utility model discloses an excitation module, comprising a coil sleeved on a magnetic pole iron core to form an excitation winding; the pole shoe is in threaded connection with the magnetic pole iron core, the width of the pole shoe is larger than that of the excitation winding, and the pole shoe plays a role in concentrating a magnetic field and adjusting magnetic field distribution in an air gap; the silicon steel sheet wraps the coil and is used for enhancing the inductance of the excitation module. Aiming at the problems that a pole shoe and a magnetic pole iron core of an existing excitation module adopt a welding mode, a bulge exists at a welding part, and a pole shoe plate is easy to deform after welding, the excitation module changes welding into threaded connection, and the connection strength is similar to the welding mode, so that the welding process is saved, the assembly process is compact, the working hours are reduced, and the production efficiency is improved. Conditions are created for batch production, and material processing is more convenient.

Description

Technical Field

[0001] This utility model belongs to the technical field of electromagnetic flowmeters, and particularly relates to an excitation module for electromagnetic flowmeters. Background Technology

[0002] To improve the assembly efficiency of ammeters during mass production, many manufacturers are now gradually adopting the method of combining the four important meter body components—coil, silicon steel sheet, pole shoe, and magnetic pole core—into a single pre-assembled unit.

[0003] Different specifications of parts are different. Among them, the combination of pole shoes and magnetic pole cores is often connected by welding. However, the welded parts often have protrusions, which requires high skills from the operators. The pole shoe plates are also prone to deformation after welding.

[0004] Others use mortise and tenon joints, which are efficient for mass production, but the disadvantages are that the connection is not strong, the connection point has protrusions, and the material processing precision is required. Utility Model Content

[0005] The purpose of this invention is to provide an excitation module that uses a threaded connection between the pole shoe and the magnetic pole core. The connection strength and welding method are similar, which not only saves the welding process and makes the assembly process compact, but also reduces working time and improves production efficiency.

[0006] To solve the above problems, the technical solution of this utility model is as follows:

[0007] An excitation module for an electromagnetic flowmeter includes:

[0008] A coil is wound around a magnetic pole core to form an excitation winding;

[0009] The pole shoe is threaded to the end of the magnetic pole core. The width of the pole shoe is greater than the width of the excitation winding. It serves to concentrate the magnetic field and adjust the magnetic field distribution in the air gap.

[0010] A silicon steel sheet is wrapped around the coil and fixed to the magnetic pole core to enhance the inductance of the excitation module.

[0011] According to one embodiment of the present invention, the coil is made of enameled wire or insulated copper wire.

[0012] According to one embodiment of the present invention, an insulating layer is provided between the coil and the silicon steel sheet to prevent short circuit.

[0013] According to one embodiment of the present invention, the coil is fixed to the magnetic pole core by bolts.

[0014] According to one embodiment of the present invention, the coil and the magnetic pole core are integrated into a single design, which improves the stability of the excitation winding.

[0015] According to one embodiment of the present invention, the pole shoe is lengthened by increasing the thickness of the thread to improve the firmness of the connection with the magnetic pole core.

[0016] An electromagnetic flowmeter includes the above-mentioned excitation module.

[0017] Because of the adoption of the above technical solution, this utility model has the following advantages and positive effects compared with the prior art:

[0018] The excitation module in one embodiment of this utility model includes: a coil sleeved on a magnetic pole core to form an excitation winding; a pole shoe threadedly connected to the magnetic pole core, the width of which is greater than the width of the excitation winding, serving to concentrate the magnetic field and adjust the magnetic field distribution in the air gap; and a silicon steel sheet wrapped around the coil to enhance the inductance of the excitation module. Addressing the problem that existing excitation modules use welding between the pole shoe and the magnetic pole core, resulting in protrusions at the welding points and easy deformation of the pole shoe plate after welding, this embodiment replaces welding with a threaded connection. The connection strength is similar to that of welding, eliminating the welding process, making the assembly process more compact, reducing labor time, creating conditions for mass production, and facilitating material processing. Attached Figure Description

[0019] Figure 1 This is a cross-sectional view of the excitation module in one embodiment of the present invention.

[0020] Explanation of reference numerals in the attached figures:

[0021] 1: Silicon steel sheet; 2: Coil; 3: Washer; 4: Magnetic pole core; 5: Nut; 6: Pole shoe. Detailed Implementation

[0022] The excitation module of this utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. The advantages and features of this utility model will become clearer from the following description and claims.

[0023] Please refer to Figure 1 This embodiment provides an excitation module for an electromagnetic flowmeter, comprising:

[0024] Coil 2 is sleeved on the magnetic pole core 4 to form an excitation winding;

[0025] The pole shoe 6 is threaded to the end of the magnetic pole core 4. The width of the pole shoe 6 is greater than the width of the excitation winding, and it serves to concentrate the magnetic field and adjust the magnetic field distribution in the air gap.

[0026] A silicon steel sheet 1 is wrapped around the coil 2 and fixed to the side of the magnetic pole core 4 to enhance the inductance of the excitation module. The silicon steel sheet 1 is fixed to the magnetic pole core by a washer 3 and a nut 5.

[0027] The excitation module changes the connection between the pole shoe 6 and the magnetic pole core 4 from welding to threaded connection. The connection strength is similar to that of welding, which not only saves welding process and makes assembly more compact, but also reduces working time, creating conditions for mass production and making material processing more convenient.

[0028] In the excitation module of an electromagnetic flowmeter, the connection between coil 2 and magnetic pole core 4 is primarily based on the principles of electromagnetic induction and structural design requirements. One of the following connection methods can be used:

[0029] The coil is wound around the magnetic pole core;

[0030] The excitation coil is typically made of enameled wire or insulated copper wire and is directly wound around a magnetic pole core made of laminated silicon steel sheets. The high permeability and low resistivity of the silicon steel sheets effectively increase the magnetic field strength and reduce losses.

[0031] The setting of the insulation layer;

[0032] To prevent short circuits between the coil and the magnetic core, an insulating layer is typically placed between the coil and the silicon steel sheet. This insulating layer can be insulating varnish or an insulating film, ensuring electrical isolation between the coil and the core.

[0033] Mechanical fixing method

[0034] The connection between the coil and the magnetic pole core relies not only on electromagnetic coupling but also on mechanical fixation. This is typically achieved through the following methods:

[0035] Bolt fixing: The coil and the magnetic pole core are fixed together with bolts to ensure that the coil will not loosen during operation.

[0036] Integrated structural design: In some designs, the coil and magnetic pole core are integrated into a single structure to reduce assembly errors and improve overall stability.

[0037] The integrated design of the coil and magnetic pole core offers several significant advantages in the excitation module of an electromagnetic flowmeter, primarily in terms of structural stability, performance optimization, improved reliability, and cost control. The specific benefits are as follows:

[0038] 1. Improve structural stability

[0039] Reduced component loosening: The integrated design tightly combines the coil and the magnetic pole core, reducing component loosening or displacement caused by mechanical vibration or thermal expansion, thereby ensuring the stability of the excitation module during long-term operation.

[0040] Enhanced overall strength: Through integrated design, the coil and magnetic pole core form a robust integral structure that can better withstand external pressure and internal magnetic field forces.

[0041] 2. Optimize magnetic field distribution

[0042] Reduced magnetic leakage: The integrated design ensures a tight fit between the coil and the silicon steel sheet, reducing the leakage of magnetic lines of force and concentrating the magnetic field in the working area, thereby improving the magnetic field strength and measurement accuracy.

[0043] Uniform magnetic field distribution: Through optimized design, a more uniform magnetic field distribution can be achieved, reducing measurement errors caused by non-uniform magnetic fields.

[0044] 3. Improve electromagnetic properties

[0045] Reduced resistance loss: The integrated design reduces the air gap between the coil and the silicon steel core, lowering the magnetic reluctance of the magnetic circuit, thereby improving the efficiency of the magnetic field and reducing energy consumption.

[0046] Improved response speed: The integrated design reduces mechanical connections and contact resistance, resulting in a faster electromagnetic response speed for the excitation module, which can better adapt to rapidly changing measurement needs.

[0047] 4. Enhance reliability

[0048] Reduce assembly errors: The integrated design avoids errors that may occur in the traditional assembly process, improving the manufacturing precision and consistency of the excitation module.

[0049] Improved durability: The integrated structure reduces friction and wear between components, extending the service life of the excitation module.

[0050] 5. Simplify manufacturing processes

[0051] Reduced production costs: Integrated design reduces the number of parts and assembly steps, thereby reducing manufacturing costs and production cycles.

[0052] Improve production efficiency: Through integrated design, a more efficient production process can be achieved, improving production efficiency and product quality.

[0053] 6. Adaptable to complex working conditions

[0054] Anti-interference capability: The integrated design can better shield external electromagnetic interference, improve the anti-interference capability of the excitation module, and ensure stable operation in complex electromagnetic environments.

[0055] Corrosion resistance: In some designs, the integrated structure can improve the corrosion resistance of the excitation module through surface treatment or material selection, making it suitable for harsh working environments.

[0056] 7. Easy to maintain and replace

[0057] Modular design: While an integrated design reduces the number of components, a modular design makes the excitation module easier to maintain and replace. In case of a problem, the entire module can be replaced without disassembly and reassembly.

[0058] In this embodiment, the pole shoe 3 and the magnetic pole core 4 are connected by threads. In order to strengthen the connection, the pole shoe 3 is lengthened by increasing the thickness of the threads to improve the firmness of the connection with the magnetic pole core 4, thereby improving the performance of the excitation module.

[0059] Based on the excitation module described above, this embodiment also provides an electromagnetic flowmeter, which includes the excitation module to generate a uniform and stable magnetic field, enabling the conductive liquid to cut magnetic lines of force when passing through the measuring pipe, thereby inducing an electromotive force in the liquid. According to Faraday's law of electromagnetic induction, the induced electromotive force is proportional to the liquid's flow velocity, and the liquid flow rate can be calculated by measuring the induced electromotive force.

[0060] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments. Even if various changes are made to the present invention, if these changes fall within the scope of the claims of the present invention and their equivalents, they shall still fall within the protection scope of the present invention.

Claims

1. An excitation module for an electromagnetic flowmeter, characterized by, The application relates to a magnetic excitation module. The application relates to a magnetic excitation module. The application relates to a magnetic excitation module. The application relates to a magnetic excitation module.

2. The field module of claim 1, wherein, The application relates to a magnetic excitation module.

3. The field module of claim 1, wherein, The application relates to a magnetic excitation module.

4. The field module of claim 1, wherein, The application relates to a magnetic excitation module.

5. The field module of claim 1, wherein, The application relates to a magnetic excitation module.

6. The field module of claim 1, wherein, The application relates to a magnetic excitation module.

7. An electromagnetic flowmeter characterized by, The application relates to a magnetic excitation module. The application relates to a magnetic excitation module. The application relates to a magnetic excitation module. The application relates to a magnetic excitation module. The application relates to a magnetic excitation module. The application relates to a magnetic excitation module. The application relates to a magnetic excitation module. The application relates to a magnetic excitation module. The application relates to a magnetic excitation module. The application relates to a magnetic excitation module. The application relates to a magnetic excitation module. The application relates to a magnetic excitation module. The application relates to a magnetic excitation module. The application relates to a magnetic excitation module. The application relates to a magnetic excitation module. The application relates to a magnetic excitation module. The application relates to a magnetic excitation module. The application relates to a magnetic excitation module. The application relates to a magnetic excitation module. The application relates to a magnetic excitation module. The application relates to a magnetic excitation module. The application relates to a magnetic excitation module. The application relates to a magnetic excitation module. The application relates to a magnetic excitation module. The application relates to a magnetic excitation module. The application relates to a magnetic excitation module. The application relates to a magnetic excitation module. The application relates to a magnetic excitation module. The application relates to a magnetic excitation module. The application relates to a magnetic excitation module. The application relates to a magnetic excitation module. The application relates to a magnetic excitation module. The application relates to a magnetic excitation module. The application relates to a magnetic excitation module. The application relates to a magnetic excitation module. The application relates to a magnetic excitation module. The application relates to a magnetic excitation module. The application relates to a magnetic excitation module. The application relates to a magnetic excitation module. The application relates to a magnetic excitation module.

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