A sensor and electromagnetic flowmeter

Abstract

The utility model discloses a sensor and electromagnetic flowmeter, sensor includes pipeline department still includes: two coils, is saddle -shaped structure, symmetrically sets up the circumferential surface of pipeline department, magnetic yoke, including the arc section of being attached to the surface of pipeline department, the cooperation department of being located arc section one end, the transition part of being located cooperation department one end and the connecting portion being connected with the pipeline department, the arc section with cooperation department is located the coil inside, the transition part covers at least part coil, at least one cooperation department of magnetic yoke with a coil uses, through the magnetic yoke of covering at the coil surface makes between two saddle -shaped coils and forms the uniform magnetic field.

Description

Technical Field

[0001] This utility model relates to the field of flow meter technology, specifically to a sensor and an electromagnetic flow meter. Background Technology

[0002] Electromagnetic flow meters are flow measurement instruments that operate based on the Faraday principle of electromagnetic induction. They work by applying a magnetic field perpendicular to the fluid flow direction, which induces an electromotive force in the fluid that is proportional to the flow velocity, thereby calculating the flow rate. The sensor, as the core component of the electromagnetic flow meter, directly determines the stability of the induced electromotive force and the accuracy of the measurement through the uniformity of its magnetic field distribution.

[0003] In existing technologies, the magnetic circuit system of traditional electromagnetic flowmeter sensors typically employs a simple structural design: the excitation coil is often a regular shape, such as a ring or rectangle, wound around the outside of the measuring tube. The magnetic field generated by such coils is acceptable in the central region of the pipe, but near the pipe wall, especially near the electrode mounting location, the magnetic field strength attenuates significantly and becomes unevenly distributed, resulting in inconsistent induced electromotive force signals. Furthermore, the magnetic yoke is usually made of magnetically conductive materials (such as ordinary silicon steel) and is often a simple semi-circular sheet structure, primarily serving to guide magnetic lines of force. However, due to its simple shape and imperfect magnetic circuit design, its ability to concentrate and shape the magnetic field is limited, making it difficult to effectively constrain the magnetic lines of force, leading to partial magnetic flux leakage and preventing the formation of an ideal uniform magnetic field across the pipe cross-section.

[0004] Defects and shortcomings of existing technology: Due to the limitations of the coil shape and magnetic yoke structure mentioned above, existing electromagnetic flowmeter sensors generally suffer from the following problems: Non-uniform magnetic field distribution: Inside the pipe, especially at the measuring section where the electrodes are located, the magnetic field strength gradient is large, making it impossible to form a stable and uniform working magnetic field. This causes the induced electromotive force signal to be affected not only by the flow velocity but also by the fluid's position within the pipe, introducing nonlinear errors. Utility Model Content

[0005] To solve the above technical problems, this utility model provides a sensor and an electromagnetic flowmeter, which uses a magnetic yoke covering the surface of the coil to create a uniform magnetic field between two saddle-shaped coils.

[0006] The present invention adopts the following technical solution: A sensor, including a pipe section, further includes: Two coils, saddle-shaped structures, are symmetrically arranged on the circumferential surface of the pipe section; The magnetic yoke includes an arc-shaped portion that fits against the surface of the pipe section, a mating portion located at one end of the arc-shaped portion, a transition portion located at one end of the mating portion, and a connecting portion that connects to the pipe section. The arc-shaped portion and the mating portion are located inside the coil, the transition portion covers at least a portion of the coil, and at least one of the magnetic yokes is used in conjunction with one of the coils; By employing a symmetrically arranged saddle-shaped coil and magnetic yoke structure, the magnetic field is effectively guided and concentrated, resulting in a more uniform magnetic field distribution within the pipe, thereby improving the stability and measurement accuracy of the induced voltage signal.

[0007] Preferably, the coil has a receiving hole in the middle, and at least one of the arcuate portions of the magnetic yoke is located in the receiving hole and connected to the pipe portion by mounting bolts.

[0008] Preferably, the mating portion and the transition portion cover the coil surface, and the mating arc portion further constrains the magnetic field path, reduces magnetic field leakage, and enhances the uniformity and intensity of the magnetic field in the measurement area.

[0009] Preferably, the connecting part is provided with a positioning hole and a receiving groove; the positioning hole is provided with a positioning bolt connected to the pipe part, which facilitates the accurate positioning and installation of the magnetic yoke.

[0010] Preferably, at least some of the positioning holes of the connecting parts of the adjacent magnetic yokes overlap, and the overlapping parts are connected to the pipe part by positioning bolts passing through the positioning holes, so as to ensure that the installation positions of multiple magnetic yokes are consistent and to enhance the structural stability and magnetic field uniformity of the magnetic circuit.

[0011] Preferably, the pipeline section also includes flanges at both ends. The inner wall of the pipeline body and the flanges are provided with liners. The flanges facilitate the connection between the sensor and the external pipeline, and the liners protect the inner wall of the pipeline, prevent fluid corrosion, and extend the service life of the sensor.

[0012] Preferably, the pipe section is provided with a housing to accommodate the coil and the yoke. The housing includes two parallel third housings and a first housing and a second housing located between the two third housings. The housing adopts a split design, which facilitates production, assembly and maintenance, and at the same time provides a stable protective environment for the internal components.

[0013] Preferably, the system also includes an electrode section, which includes two measuring electrodes disposed on the pipe section and a grounding electrode, with the two measuring electrodes disposed opposite to each other.

[0014] Preferably, the two measuring electrodes and the grounding electrode are disposed on the same vertical axis section of the pipe section, which facilitates the drilling of holes in the pipe section, while ensuring the symmetry and consistency of the measurement signal acquisition, and further improving the accuracy of flow calculation.

[0015] An electromagnetic flow meter includes a sensor and a converter mounted on a housing in the pipeline section. It features a more uniform magnetic field distribution and a more stable signal output, significantly improving overall measurement performance and making it suitable for high-precision flow monitoring scenarios.

[0016] Compared with the prior art, the present invention has the following advantages: 1. By employing symmetrically arranged saddle-shaped coils and combining them with a matching magnetic yoke of a specific shape (including arc-shaped sections, mating sections, transition sections, and connecting sections), an optimized magnetic circuit structure is constructed. This structure effectively guides, concentrates, and confines magnetic field lines, greatly reducing magnetic field leakage and distortion, thereby forming a highly uniform and stable working magnetic field in the central measurement area of ​​the pipeline. This fundamental improvement directly enhances the quality of the induced electromotive force signal, making the flow measurement results more accurate and reliable, especially improving the ability to measure small flow rates and resist flow interference.

[0017] 2. The magnetic yoke is made of laminated silicon steel sheets and is precisely fixed using positioning bolts through connecting parts with positioning holes and receiving grooves. In particular, the design of overlapping positioning holes of adjacent magnetic yokes ensures strict consistency in the installation positions of multiple magnetic yokes and overall structural rigidity. This design not only simplifies assembly, but more importantly, ensures the consistency of magnetic circuit parameters, resulting in good repeatability and stability of the magnetic field performance of each sensor, thus improving product quality.

[0018] 3. The sensor housing adopts a split structure composed of a first housing, a second housing, and two third housings. This design allows the third housing to be welded to the pipeline first, and then the first and second housings to be assembled. This greatly facilitates the installation, positioning, and subsequent maintenance and replacement of complex components such as internal coils, magnetic yokes, and electrodes, and reduces the difficulty of the production process and manufacturing costs.

[0019] 4. Two horizontally opposed measuring electrodes were set up, and a grounding electrode was arranged vertically opposite each other, with all electrodes located on the same cross-section. This symmetrical layout, combined with a uniform magnetic field, enables the acquisition of higher quality differential signals.

[0020] 5. Integrated flanges at both ends of the piping section facilitate direct connection to industrial pipelines. Optimized internal magnetic circuitry and housing design enable the sensor to achieve superior performance while maintaining a compact external size, making it easy to deploy and use in various space-constrained environments. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the sensor structure.

[0022] Figure 2 This is the front view of the sensor.

[0023] Figure 3This is a partial structural diagram of the sensor.

[0024] Figure 4 This is a schematic diagram of the main components of the sensor.

[0025] Figure 5 This is a schematic diagram of the internal structure of the sensor.

[0026] Figure 6 This is a schematic diagram of the magnetic yoke mechanism.

[0027] Figure 7 This is a schematic diagram of the assembly structure of the coil and the yoke.

[0028] In the figure, the components are: pipe section 1, flange 1-1, liner 1-2, first housing 1-3, transmitter connection hole 1-3-1, second housing 1-4, third housing 1-5, coil 2, receiving hole 2-1, magnetic yoke 3, arc-shaped part 3-1, mating part 3-2, transition part 3-3, connecting part 3-4, positioning hole 3-4-1, receiving groove 3-4-2, measuring electrode 4, grounding electrode 5, mounting bolt 6, and positioning bolt 7. Detailed Implementation

[0029] To facilitate understanding of the technical solution of this utility model, the following detailed description is provided in conjunction with the accompanying drawings and specific embodiments.

[0030] Firstly, such as Figures 1-7 As shown, this application discloses a sensor, including a pipe section 1, a coil 2, a magnetic yoke 3, and an electrode section.

[0031] The pipeline section 1 has a through cylindrical pipe body, including flanges 1-1 at both ends. The inner wall of the pipeline section 1 and the flanges 1-1 are provided with liners 1-2. The pipeline section 1 has a housing that accommodates the electrode section, coil 2, and magnetic yoke 3. The housing is a hollow cylindrical structure, including two parallel third housings 1-5 and a first housing 1-3 and a second housing 1-4 located between the two third housings 1-5. Additionally, the first housing 1-3 has a transmitter connection hole 1-3-1 for connecting a transmitter.

[0032] The coil 2 has a saddle-shaped structure with an arc-shaped upper surface, and is symmetrically arranged on the circumferential surface of the pipe section 1. The coil 2 has a receiving hole 2-1 in the middle.

[0033] The magnetic yoke 3 is made of silicon steel sheet and includes an arc-shaped part 3-1 that fits against the surface of the pipe section 1, a mating part 3-2 located at one end of the arc-shaped part 3-1, a transition part 3-3 located at one end of the mating part 3-2, and a connecting part 3-4 connected to the pipe section 1. The mating part 3-2 is a plate-like structure that fits against the inner wall of the receiving hole 2-1 of the coil 2, and the transition part 3-3 is an arc-shaped structure that fits against the arc-shaped surface of the coil 2. The arc-shaped part 3-1 is located inside the receiving hole 2-1 and is connected to the pipe section 1 by mounting studs 6. The specific shapes of the arc-shaped part 3-1, the mating part 3-2, and the transition part 3-3 further constrain the magnetic field and reduce magnetic leakage, making the magnetic field intensity distributed in the pipe section 1 more uniform and closer to a uniform magnetic field, thereby improving the accuracy of flow measurement.

[0034] Each coil 2 is provided with a set of magnetic yokes 3, and each set of magnetic yokes 3 is provided with at least two layers; in one embodiment, each set of magnetic yokes 3 is two layers, and the two sets of magnetic yokes 3 are stacked on each other; there are two stacking methods, the first method is that one set of magnetic yokes 3 is stacked on another set of magnetic yokes 3, and the second method is that four magnetic yokes 3 are stacked interlaced.

[0035] The connecting part 3-4 is provided with a positioning hole 3-4-1 and a receiving groove 3-4-2; the positioning hole 3-4-1 is provided with a positioning bolt 7 for connecting to the pipe part 1, and at least part of the positioning holes 3-4-1 on the connecting parts 3-4 of adjacent magnetic yokes 3 overlap, and the positioning bolt 7 passes through the overlapping part of the positioning holes 3-4-1 and is connected to the pipe part 1. The receiving groove 3-4-2 has a semi-racetrack-shaped structure. After adjacent magnetic yokes 3 are connected, the two receiving grooves 3-4-2 cooperate to form a circular structure for accommodating the measuring electrode 4.

[0036] The electrode section is disposed on the circumferential surface of the pipe section 1, including two measuring electrodes 4 disposed opposite to each other on the pipe section 1 and a grounding electrode 5 located between the two measuring electrodes 4. The grounding electrode 5 is disposed opposite to the mounting stud 6. The two measuring electrodes 4, the grounding electrode 5 and the mounting stud 6 are disposed on the same vertical axial section of the pipe section 1.

[0037] After the external circuit inputs an AC excitation signal to coil 2, coil 2 generates an alternating magnetic field, which induces a voltage in the fluid flowing in the pipe. The measuring electrode collects the induced voltage generated by the fluid and outputs it to the external signal processing circuit to calculate the flow rate of the fluid in the pipe. By adopting a structure in which the symmetrically arranged saddle-shaped coil 2 and magnetic yoke 3 are matched, the magnetic yoke 3 is attached to the surface of coil 2, which effectively guides and concentrates the magnetic field, so that a more uniform magnetic field distribution is formed in the pipe, improving the stability and measurement accuracy of the induced voltage signal.

[0038] Secondly, this application discloses an electromagnetic flowmeter, including a sensor and a converter mounted on a housing of the pipe section 1, wherein the circuit board assembly of the converter is electrically connected to the electrode section of the sensor.

[0039] The above are merely preferred embodiments of this utility model. The scope of protection of this utility model is defined by the scope of the claims. Any improvements and modifications made by those skilled in the art without departing from the spirit and scope of this utility model should also be considered as protection within the scope of this utility model.

Claims

1. A sensor, characterized in that, Including the piping section (1), it also includes: Two coils (2) are saddle-shaped structures and are symmetrically arranged on the circumferential surface of the pipe section (1); The magnetic yoke (3) includes an arc-shaped portion (3-1) that fits against the surface of the pipe portion (1), a mating portion (3-2) located at one end of the arc-shaped portion (3-1), a transition portion (3-3) located at one end of the mating portion (3-2), and a connecting portion (3-4) connected to the pipe portion (1). The arc-shaped portion (3-1) and the mating portion (3-2) are located inside the coil (2), and the transition portion (3-3) covers at least a portion of the coil (2). At least one of the magnetic yokes (3) is used in conjunction with one of the coils (2).

2. The sensor according to claim 1, characterized in that, The coil (2) has a receiving hole (2-1) in the middle, and at least one of the arc-shaped portions (3-1) of the magnetic yoke is located in the receiving hole (2-1) and is connected to the pipe portion (1) by a mounting bolt (6).

3. The sensor according to claim 1, characterized in that, The mating part (3-2) and the transition part (3-3) cover the surface of the coil (2).

4. The sensor according to claim 1, characterized in that, The connecting part (3-4) is provided with a positioning hole (3-4-1) and a receiving groove (3-4-2); the positioning hole (3-4-1) is provided with a positioning bolt (7) connected to the pipe part (1).

5. The sensor according to claim 4, characterized in that, At least a portion of the positioning holes (3-4-1) on the connecting part (3-4) of the adjacent magnetic yoke (3) overlap, and the positioning bolt (7) passes through the overlapping portion of the positioning holes (3-4-1) and is connected to the pipe part (1).

6. The sensor according to claim 1, characterized in that, The pipe section (1) also includes flanges (1-1) located at both ends, and the inner wall of the pipe body of the pipe section (1) and the flanges (1-1) are provided with liners (1-2).

7. The sensor according to claim 1, characterized in that, The pipe section (1) is provided with a housing for accommodating the coil (2) and the magnetic yoke (3). The housing includes two parallel third housings (1-5) and a first housing (1-3) and a second housing (1-4) located between the two third housings (1-5).

8. The sensor according to claim 1, characterized in that, It also includes an electrode section, which includes two measuring electrodes (4) disposed on the pipe section (1) and a grounding electrode (5), with the two measuring electrodes (4) disposed opposite to each other.

9. The sensor according to claim 8, characterized in that, The two measuring electrodes (4) and the grounding electrode (5) are disposed on the same vertical axis section of the pipe section (1).

10. An electromagnetic flowmeter, characterized in that, Includes the sensor as described in any one of claims 1-9 and the converter mounted on the housing of the pipe section (1).

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