Magnetic material and electromagnetic flowmeter sensor

Abstract

The present invention relates to the field of magnetic material technology, and specifically discloses an electromagnetic flowmeter sensor, comprising a first flange, a second flange, a flow conduit, and a pole shoe. The first flange and the second flange are respectively fixedly connected to the flow conduit and respectively sleeved on the outer wall of the flow conduit. There are two pole shoes, each fixedly connected to the flow conduit and located on the outer wall of the flow conduit, and the two pole shoes are arranged opposite each other. Integral casting avoids the influence of welds on the electromagnetic flowmeter signal, thereby ensuring the measurement accuracy of the electromagnetic flowmeter. The magnetic material precipitates a fixed phase by controlling the heat treatment temperature, achieving extremely low coercive force and remanence. The remanence of the pole shoe is used for excitation, and the remanence is excited by the magnetic material, greatly reducing the power consumption of the electromagnetic flowmeter.

Description

Technical Field

[0001] The present invention relates to the technical field of magnetic materials, and in particular to a magnetic material and an electromagnetic flowmeter sensor. Background Art

[0002] Currently, electromagnetic flowmeters are widely used in various fluid environments due to their simple structure, wide measuring range, and corrosion resistance. The accuracy of electromagnetic flowmeters is closely related to measurement accuracy. Factors affecting electromagnetic flowmeter accuracy include: the structure of the electromagnetic flowmeter, the excitation method of the electromagnetic flowmeter, and the signal processing method of the electromagnetic flowmeter. The structure and excitation method of the electromagnetic flowmeter are the basis for generating the measurement signal.

[0003] However, in the existing technology, the structure of the electromagnetic flowmeter is mainly composed of a flange guide tube welding assembly, measuring electrodes, and an insulating lining. The symmetry of the measuring electrode hole position and the pole shoe positioning of the flange guide tube welding assembly directly affects the zero point stability of the electromagnetic flowmeter. The magnetism generated by the flange guide tube weld directly affects the stability of the electromagnetic flowmeter signal, thereby affecting the measurement accuracy of the electromagnetic flowmeter. Summary of the Invention

[0004] The purpose of the present invention is to provide a magnetic material and an electromagnetic flowmeter sensor, aiming to solve the technical problems in the prior art that the symmetry of the measuring electrode hole position and the pole shoe positioning of the flange guide tube welding assembly directly affects the zero point stability of the electromagnetic flowmeter, and the magnetism generated by the flange guide tube weld directly affects the stability of the electromagnetic flowmeter signal, thereby affecting the measurement accuracy of the electromagnetic flowmeter.

[0005] To achieve the above-mentioned purpose, the present invention adopts an electromagnetic flowmeter sensor, including a first flange, a second flange, a flow guide tube and a pole shoe. The first flange and the second flange are respectively fixedly connected to the flow guide tube and are respectively sleeved on the outer wall of the flow guide tube. There are two pole shoes, and the two pole shoes are respectively fixedly connected to the flow guide tube and are respectively located on the outer wall of the flow guide tube, and the two pole shoes are arranged opposite to each other.

[0006] The flow guide tube has two electrode measurement holes, which are arranged opposite to each other, and the axial directions of the two electrode measurement holes are perpendicularly passed through between the two pole shoes.

[0007] The first flange, the second flange and the flow guide pipe are all made of austenitic stainless steel, and the first flange, the second flange and the flow guide pipe are integrally cast.

[0008] Wherein, the two pole shoes are both made of magnetic material and are formed by secondary casting with the guide tube.

[0009] The present invention also provides a magnetic material for preparing the electromagnetic flowmeter sensor as described above, comprising the following mass fractions: 25% chromium, 55% iron, 10% cobalt and 10% titanium.

[0010] The beneficial effects of a magnetic material and an electromagnetic flowmeter sensor of the present invention are as follows: the present invention adopts casting molding, and the symmetry of the electromagnetic flowmeter sensor is ensured by the mold. The one-piece casting avoids the influence of the weld on the electromagnetic flowmeter signal, thereby ensuring the measurement accuracy of the electromagnetic flowmeter. The magnetic material precipitates a fixed phase by controlling the heat treatment temperature to achieve extremely low coercive force and remanence. The remanence of the pole shoe is used for excitation, and the remanence is excited by the magnetic material, which greatly reduces the power consumption of the electromagnetic flowmeter. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0012] Figure 1 It is a structural schematic diagram of an electromagnetic flowmeter sensor of the present invention.

[0013] Figure 2 It is a cross-sectional view of the internal structure of an electromagnetic flowmeter sensor of the present invention.

[0014] 1-first flange, 2-second flange, 3-flow guide tube, 4-pole shoe, 5-electrode measuring hole. DETAILED DESCRIPTION

[0015] See also Figure 1 and Figure 2 The present invention provides an electromagnetic flowmeter sensor, including a first flange 1, a second flange 2, a flow guide tube 3 and a pole shoe 4. The first flange 1 and the second flange 2 are respectively fixedly connected to the flow guide tube 3 and are respectively sleeved on the outer wall of the flow guide tube 3. There are two pole shoes 4. The two pole shoes 4 are respectively fixedly connected to the flow guide tube 3 and are respectively located on the outer wall of the flow guide tube 3, and the two pole shoes 4 are arranged opposite to each other.

[0016] Furthermore, the flow guide tube 3 has two electrode measurement holes 5 , the two electrode measurement holes 5 are arranged opposite to each other, and the axial directions of the two electrode measurement holes 5 vertically pass through between the two pole shoes 4 .

[0017] Furthermore, the first flange 1 , the second flange 2 and the flow guide pipe 3 are all made of austenitic stainless steel, and the first flange 1 , the second flange 2 and the flow guide pipe 3 are integrally cast.

[0018] Furthermore, the two pole shoes 4 are both made of magnetic material and are secondary cast with the flow guide tube 3 .

[0019] The present invention also provides a magnetic material for preparing the flange of the electromagnetic flowmeter guide tube 3 as described above, comprising the following mass fractions: 25% chromium, 55% iron, 10% cobalt and 10% titanium.

[0020] In this embodiment, the symmetry of the flange of the electromagnetic flowmeter flow guide tube 3 is ensured by the mold, and the integral casting avoids the influence of the weld on the electromagnetic flowmeter signal, thereby ensuring the measurement accuracy of the electromagnetic flowmeter. The magnetic material is precipitated with a fixed phase by controlling the heat treatment temperature to achieve extremely low coercive force and remanence. The remanence of the pole piece 4 is used for excitation, and the remanence is excited by the magnetic material, which greatly reduces the power consumption of the electromagnetic flowmeter.

[0021] Utilizing the characteristics of the magnetic material, the ultra-low coercive force H c (0.5kA / m) and relatively high remanence Br (2.8T), and utilizing ultra-low coercivity and relatively high remanence for excitation, the power consumption of the electromagnetic flowmeter is greatly reduced. When the magnetic material is heat treated, the heat treatment temperature is 485°C ± 5°C, kept at this temperature for 0.5h, and then slowly cooled to room temperature along with the furnace temperature;

[0022] The effects of heat treating the magnetic material are:

[0023] 1. Reduce casting stress and thus reduce the coercive force of the material: During the casting cooling process, the product will inevitably produce uneven cooling due to differences in product shape, which will inevitably generate residual stress σ. Due to the magnetostrictive effect of the material, the material has magnetoelastic energy Eσ, which is another manifestation of coercive force. Eσ=K*σ. From the above formula, it can be concluded that residual stress and coercive force are proportional. The process of heat treatment and furnace cooling will remove most of the residual stress, thereby reducing the coercive force of the material.

[0024] 2. Stabilize the material structure, eliminate defects in the casting process, and reduce the coercive force of the material: During the casting process, the product will have uneven composition and the microstructure of the material will be disordered. The heat treatment process will complete the transformation of the material from disordered phase to ordered phase. The magnetic material can be regarded as composed of a large number of tiny magnetic regions. Before heat treatment, it is a disordered phase and the magnetic domains are also disordered. After heat treatment, it is an ordered phase and the magnetic domains are also regular. Regular magnetic domains will reduce the coercive force of the material, and the uniform and orderly structure will increase the coercive force of the material.

[0025] 3. Control the phase precipitated during the heat treatment process and the proportion of the precipitated phase to enhance the residual magnetic properties of the material: within the range of 485℃±5℃, the material will precipitate 28% of the σ phase, which is a body-centered cubic structure. The magnetism of the material is related to the movement of electrons. Electrons move and spin around the nucleus, thus having orbital magnetic moment and spin magnetic moment. The molecular magnetic moment of the body-centered cubic is not zero, so it will produce magnetism.

[0026] 4. The addition of titanium stabilizes the σ phase, while controlling the proportion of the σ phase can control the increase in coercive force, thereby ensuring the performance of the magnetic material.

[0027] The above disclosure is only a preferred embodiment of the present invention, and certainly cannot be used to limit the scope of the rights of the present invention. Ordinary technicians in this field can understand that all or part of the processes of the above embodiment and equivalent changes made in accordance with the claims of the present invention are still within the scope of the invention.

Claims

1. An electromagnetic flowmeter sensor, characterized in that: The device comprises a first flange, a second flange, a flow guide tube, and a pole shoe. The first flange and the second flange are respectively fixedly connected to the flow guide tube and are respectively sleeved on the outer wall of the flow guide tube. There are two pole shoes, each of which is fixedly connected to the flow guide tube and is respectively located on the outer wall of the flow guide tube. The two pole shoes are arranged opposite to each other. The first flange, the second flange and the flow guide tube are all made of austenitic stainless steel, and the first flange, the second flange and the flow guide tube are integrally cast; the two pole shoes are made of magnetic material and are secondary cast with the flow guide tube; The flow guide tube has two electrode measurement holes, which are arranged opposite to each other, and the axial directions of the two electrode measurement holes vertically pass through between the two pole shoes.

2. The electromagnetic flowmeter sensor according to claim 1, wherein the magnetic material used comprises the following mass fractions: 25% chromium, 55% iron, 10% cobalt and 10% titanium.

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