Today, I will introduce a national invention authorized patent-vortex flowmeter. The patent was applied for by Kroner Measurement Technology Co., Ltd., and the authorization was announced on May 24, 2017.
Content descriptionThe invention relates to a vortex flowmeter with a measuring tube through which a medium can flow, a bluff body (Staukoerper) arranged in the measuring tube for generating vortices in the medium, and a bluff body arranged in the action area of ​​the bluff body Auslenkkoerper (Auslenkkoerper), which can be deflected by the pressure fluctuation accompanying the vortex in the medium.
Background of the inventionVortex flowmeters have always been based on the measurement principle, that is, in a liquid or gaseous medium, a vortex street can be constructed after the bluff body (which is circumvented by the medium), which passes through the bluff body that moves forward with the flow. The separated vortex is formed. The frequency at which the vortex separates from the bluff body depends on the flow velocity, where the relationship is close to linear under certain conditions. In any case, the measurement of the vortex frequency is a suitable means for determining the flow velocity of the medium, so it is possible to determine the volume flow and the mass flow indirectly through the measurement of the vortex frequency with additional consideration of, for example, pressure and temperature. The vortex that appears in the vortex street of the medium causes local pressure fluctuations, which act on the deflector and are detected by it. The deflection body may be a pressure sensor, which is realized for example as a piezoelectric element, or a capacitive pressure sensor, in which the sensor element undergoes deflection even in a small range. It is only important that the deflection body is arranged in the vortex street in such a way that the vortex generated by the bluff body (at least indirectly) passes the deflection body and is therefore detectable. In this regard, the deflector body can be arranged downstream after the bluff body, in which case the bluff body and the deflector body are actually realized separately on the main body. But when, for example, in solutions with pressure sensors known from the prior art, the pressure sensor is arranged above or in the bluff body and in this way the pressure fluctuations of the vortex street are detected indirectly via the pipe, the deflection body itself can also be used. It is the bluff body or is realized in the bluff body; in this case the bluff body and the deflector are realized in one unit on the main body anyway.
For the method for detecting the movement of the deflector from the prior art, the capacitive or inductive effect is used in it, the piezoelectric ceramic is used in it, or the optical fiber is also used in it to detect the deflection, the deflector is Correspondingly, it must be contacted by electrical or optical wires, wherein these wires must be guided from the medium-filled space through the measuring tube wall or the casing of the turbine flowmeter to the medium-free space, usually to the evaluation electronics. (Auswerteelektronik). These leads must be implemented with very complex seals, because (depending on the application) high pressure stability and/or temperature stability (a few 100 bars, a few 100°C) must be achieved.
Summary of the inventionTherefore, the purpose of the present invention is to describe a vortex flowmeter in which the deflection of the deflector can be detected without the need to contact the deflector via electrical and/or optical wires, that is, there is no complicated measuring tube in it. And/or the necessity of housing leads.
The above-mentioned and illustrated purpose is first achieved in the vortex flowmeter from which the present invention is derived. That is, at least one magnetic field generating device arranged outside the measuring tube generates a magnetic field in the area of ​​the deflector, and the deflector has different Because of the permeability of the medium and influence the magnetic field, at least one magnetic field detection device for detecting the magnetic field in the region of the deflector is arranged outside the measuring tube. With the structure of the vortex flowmeter according to the present invention, the line channel to the medium chamber of the vortex flowmeter is no longer required. The only important thing for the vortex flowmeter according to the present invention is that the magnetic field generating device arranged outside the measuring tube generates a magnetic field, which in any case also extends to the area of ​​the deflector, so that the movement of the deflector affects the magnetic field. The influence of the magnetic field is identifiable not only locally in the region of the deflection body but also outside the measuring tube, and there can also be detected and then evaluated by a magnetic field detection device arranged outside the measuring tube. The measuring tube must not be designed in such a way that it shows a magnetic shield; it is preferably composed of a material with a permeability close to 1 (Permeabilitaetszahl).
According to a preferred design solution of the present invention, the magnetic field generating device has at least one first excitation coil surrounding the circumference of the measuring tube, so that the first excitation coil generates a magnetic field oriented in the axial extension of the measuring tube when current is loaded. . Here, the winding of the first excitation coil can be applied directly to the measuring tube, but the winding can also be arranged (for example cast) in a separate tube wall, for example, wherein the tube containing the first excitation coil is then pushed onto the measuring tube on. According to another preferred embodiment, the magnetic field generating device additionally has a second excitation coil surrounding the circumference of the measuring tube adjacent to the first excitation coil, wherein the second excitation coil is also generated in the axial direction of the measuring tube when current is applied. Oriented magnetic field in extension. In particular, the first excitation coil and the second excitation coil are then arranged side by side on the measuring tube without overlapping. The deflection body and the first excitation coil and/or the second excitation coil in the magnetic field are arranged corresponding to each other so that the deflection body can cause as strong an influence as possible on the magnetic field caused by the magnetic field generating device.
In the case that the magnetic field generating device has not only the first excitation coil but also the second excitation coil, they are arranged adjacent to each other, and the magnetic field that is particularly suitable for detecting the deflection of the deflection body can be generated from this, that is, the first excitation coil and the second excitation coil When the coils are loaded with current, they generate magnetic fields that are opposite to each other, in particular, where the deflection device is then arranged in a substantially field-free area between the first excitation coil and the second excitation coil. It is easy to understand that the opposite magnetic fields of the first excitation coil and the second excitation coil weaken each other, especially in the area where the coils are directly adjacent to each other. The coil or the energization (Bestromung) of the coil can be designed in such a way that the magnetic field strength in the region of the deflection body becomes almost or even exactly zero. When the deflection body moves, this sensitive balance is disturbed, wherein this disturbance can be detected again and therefore the deflection of the deflection body can also be detected.
In a preferred design of the present invention, through the first excitation coil and the second excitation coil are electrically connected to each other and have different winding directions, the magnetic fields of the first excitation coil and the second excitation coil in opposite directions can be specially It is produced in a simple way, wherein, preferably, the first excitation coil and the second excitation coil have the same number of turns, so the first excitation coil and the second excitation coil correspondingly cause the same magnetic field strength due to the same forced energization.
According to an advantageous development of the vortex flowmeter according to the invention, the first detector coil is implemented as a separate coil and is arranged concentrically around or in the first excitation coil and/or around or in the second excitation coil. It is also possible to wind the detector coil directly above or below the first excitation coil and/or the second excitation coil under the premise of proper electrical insulation, but it is also possible to consider placing the first detector coil on its own In the wall of the tube. Corresponding to the application of the first excitation coil and the second excitation coil in the magnetic field generation device, in another advantageous design, it is provided that the magnetic field detection device includes another second detector coil, wherein the first detector coil and The second detector coil is arranged coaxially and axially adjacent to the first excitation coil and/or the second excitation coil.
Preferably, in order to generate the magnetic field, an excitation device is provided, which in a development of the invention loads the first excitation coil and/or the second excitation coil with a sinusoidal current of constant frequency and constant amplitude, wherein the frequency used It is preferably in a frequency region far from the vortex frequency to be expected, preferably the frequency of the sinusoidal current is greater than the highest vortex frequency to be expected in the medium by at least the first power of ten, preferably greater than the second power of ten.
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