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CN-121986252-A - Transducer

CN121986252ACN 121986252 ACN121986252 ACN 121986252ACN-121986252-A

Abstract

A transducer for a mass flow meter, wherein the mass flow meter is arranged inside an outer tube, which outer tube serves as a pressure receiving part of the mass flow meter. The mass flowmeter has a tubular housing. At least one flexible plate is capable of vibrating in a torsional manner 5, said flexible plate being provided with a magnetic or magnetizable material. An electrically conductive material is embedded in the tubular housing or in the outer tube. The electrically conductive material provides a primary current path of the transducer, wherein current in the primary current path induces at least one torque in the flexible plate via the magnetic or magnetizable material. The vibration 10 of the flex plate induces a current in the main current path via the magnetic or magnetizable material, the transducer acting as a pick-up for the mass flow meter. 2 15

Inventors

  • Bjorn Eric Zebgel

Assignees

  • 西格纳斯仪器股份有限公司

Dates

Publication Date
20260505
Application Date
20240826
Priority Date
20230825

Claims (20)

  1. 1. A transducer for a mass flow meter, wherein the mass flow meter is arranged inside an outer tube, which serves as a pressure containment part of the mass flow meter, the mass flow meter comprising a tubular containment and at least one flexible plate capable of vibrating in a torsional manner, the flexible plate being provided with a magnetic or magnetizable material; The transducer includes: An electrically conductive material embedded in the tubular housing or in the outer tube, the electrically conductive material providing a primary current path of the transducer, wherein current in the primary current path induces at least one torque in the flexible plate via the magnetic or magnetizable material.
  2. 2. A transducer for a mass flow meter, wherein the mass flow meter is arranged inside an outer tube, which serves as a pressure receiving part of the mass flow meter, the mass flow meter comprising a tubular receiving part and at least one flexible plate capable of vibrating in a torsional manner, the flexible plate being provided with a magnetic or magnetizable material at a predetermined position, The transducer includes: an electrically conductive material embedded in the tubular housing or in the outer tube, the electrically conductive material providing a primary current path for the transducer, wherein vibration of the flexible plate induces a current in the primary current path via the magnetic or magnetizable material, the transducer acting as a pick-up for the mass flow meter.
  3. 3. Transducer system according to claim 1 or 2, wherein the ratio of the specific conductance of the electrically conductive material embedded in the tubular housing or in the outer tube to the specific conductance of the material of the outer tube is at least 8:1, preferably the ratio of the specific conductance of the electrically conductive material embedded in the tubular housing or in the outer tube to the specific conductance of the material of the outer tube is 10:1, most preferably the ratio of the specific conductance of the electrically conductive material embedded in the tubular housing or in the outer tube to the specific conductance of the material of the outer tube is 20:1.
  4. 4. A transducer system according to one of claims 1 to 3, wherein the ratio of the specific conductance of the electrically conductive material embedded in the tubular housing or embedded in the outer tube to the specific conductance of the material of the tubular housing is at least 8:1, preferably the ratio of the specific conductance of the electrically conductive material embedded in the tubular housing or embedded in the outer tube to the specific conductance of the material of the tubular housing is 10:1, most preferably the ratio of the specific conductance of the electrically conductive material embedded in the tubular housing or embedded in the outer tube to the specific conductance of the material of the tubular housing is 20:1.
  5. 5. The transducer according to one of claims 1 to 4, wherein the magnetic or magnetizable material is a permanent magnet.
  6. 6. The transducer according to one of claims 1 to 5, wherein the current in the main current path is an oscillating current that induces an oscillating torque in the flex plate.
  7. 7. The transducer according to one of claims 1 to 6, further comprising at least one electrical conductor on the outside of the outer tube.
  8. 8. The transducer of claims 1 to 7, wherein the current in the main current path is induced by an external coil.
  9. 9. The transducer according to one of claims 1 to 8, further comprising at least one pair of electrical conductors on the outside of the outer tube.
  10. 10. The transducer according to one of claims 1 to 9, further comprising at least one electrically conductive winding arranged on the outside of the outer tube.
  11. 11. Transducer according to one of claims 1 to 10, wherein the main current path further comprises at least one first stage electrically conductive winding arranged on the outer side of the outer tube, wherein the at least one first stage electrically conductive winding passes through a core of a second stage coil arranged on the outer side of the outer tube, wherein preferably the core is a core of iron.
  12. 12. The transducer according to one of claims 1 to 11, wherein the main current path further comprises a second stage electrically conductive winding arranged on the outside of the outer tube, the second stage electrically conductive winding passing through a common core of a first stage coil.
  13. 13. A transducer according to claim 12, wherein the second stage electrically conductive winding is a single conductor, preferably the second stage electrically conductive winding is an uninsulated conductor.
  14. 14. The transducer of one of claims 11, 12 or 13, wherein the first stage coil and the second stage electrically conductive winding are wound around a common core.
  15. 15. Transducer according to one of claims 1 to 14, wherein the outer tube is provided with holes or through openings in the region of the main current path.
  16. 16. The transducer according to one of claims 1 to 15, wherein the outer tube is made of a metal with low electrical conductivity.
  17. 17. The transducer according to one of claims 1 to 16, wherein the outer tube is made of a magnetic material, a soft magnetic material, magnetic steel, carbon steel or a nickel alloy.
  18. 18. The transducer according to one of claims 1 to 17, wherein the electrically conductive material is made of at least one of Cu, ag, au or Al (copper, silver, gold or aluminum).
  19. 19. The transducer according to one of claims 1 to 18, wherein the first stage electrically conductive winding is made of at least one of Cu, ag, au or Al.
  20. 20. The transducer according to one of claims 1to 19, wherein the second stage electrically conductive winding is made of at least one of Cu, ag, au or Al.

Description

Transducer Background The present invention relates to a transducer. The transducer may be used for a sensor arranged inside the high pressure line. The transducer may be used as an electromagnetic actuator or as a pick-up for a sensor with a tubular housing arranged inside the high-pressure line. The sensor may be a mass flow meter. Introduction to the invention Fluids such as liquid CO 2 for carbon dioxide capture and storage (CCS), fluid petroleum products, natural gas, hydrogen, and water are typically transported through pipelines. Such fluids are typically transported under high pressure. These lines may be located at greater depths on the seafloor or on land. The fluid may also be transported through pipelines in an onshore facility such as a refinery or other processing facility. The fluid has to be transported in large-sized pipelines and the fluid may typically have a low density. For example, liquid H 2 has a low density, while gaseous form H 2 has a very low density. High density fluids, such as liquid CO 2 and natural gas, are typically at higher depths on the seafloor and at 4C is transported/stored at the water temperature, or transported/stored in long pipelines with cooling arrangements. Liquid CO 2 cannot be at atmospheric pressure or above 4C is transported at ambient temperature, since for practical reasons (pipeline thickness etc.) this would require too high a pressure to be transported in the pipeline. At 4C will have a pressure of about 90 bar. Thus, it would be feasible and practical to build a pipeline for transporting liquid CO 2 at the seabed. The mass density of liquid CO 2 is about 1.1 ton per cubic meter. The liquid H 2 has a mass density of about 70 kg per cubic meter. Fluid transport may be monitored in real time by measuring the amount of fluid flowing through the pipeline. Mass flow measurement may be preferred over volumetric flow because mass does not change with pressure or temperature changes. Thus, mass flow measurements may be more accurate. Mass flowmeters based on ultrasonic measurements may also be unsuitable for use with liquids such as, for example, liquid CO 2, because the ultrasonic waves may be attenuated by the liquid. A mass flow meter using conventional coriolis technology may operate by vibrating a conduit carrying a flowing fluid between an inlet and an outlet. This vibration of the pipe provides oscillation, i.e., a change in the measured value (e.g., position) of the pipe around a central value. The inertia of the flowing fluid resists the vibratory motion and causes the conduit to twist. This distortion causes a time lag (phase shift) in the oscillations of the conduit between the inlet side and the outlet side, and this phase shift is directly affected by the mass of fluid passing through the conduit. Conventional coriolis flowmeters divide fluid flow into two conduits to provide a net zero force from the drive. Conventional coriolis direct mass flow measurements may not be suitable for mass flow measurements of high pressure fluids, and in particular for measuring d for low density fluids. Indirect mass flow measurements of high pressure fluids may be made using differential pressure and/or fluid density, but may be inaccurate. For example, the hydrogen and CO 2 transport pipes are of very large size (up to 24 inches or 30 inches in diameter) and typically have pressures of 100 bar to 200 bar. The maximum diameter of the coriolis mass flowmeter currently in existence is 16 inches and may not be used to measure the mass flow of fluid in such large conduits. For fluid transport at very high pressures (e.g., 300 bar), the largest available conventional coriolis meter may be only 6 inches to 7 inches and require a large thickness to withstand the pressure. In order to measure fluids with low density, coriolis flowmeters must have thin tube walls to detect mass flow. Thin tube walls cannot withstand high pressures. Thus, if the line size is not very small, existing coriolis mass flowmeters may not be used for high pressure applications, such as fluids at pressures above 100 bar. Existing coriolis mass flowmeters must be manufactured with a large thickness to withstand these high pressures, which results in a structure that is too rigid to vibrate to detect mass flow. For high operating pressures and/or larger diameter pipelines, the pressure-carrying metal tubing of the coriolis flowmeter may be thick. For such thick lines, it would not be possible to apply a force to the measurement conduit by using an electromagnetic actuator. Conventional coriolis flowmeters may also be unable to measure the mass flow of low density fluids because this would require high speeds of fluid flow to provide a signal, which is not possible. The design of conventional coriolis flowmeters with reduced diameter tubes may also result in a pressure drop across the mass flowmeter due to the venturi effect, as compared to tubing for fluid flow. For H 2, the pressure drop over a co