Classifications

• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
  • G01P5/00—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft
  • G01P5/24—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring the direct influence of the streaming fluid on the properties of a detecting acoustical wave
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
  • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
  • G01F1/66—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by measuring frequency, phase shift or propagation time of electromagnetic or other waves, e.g. using ultrasonic flowmeters
  • G01F1/662—Constructional details

Definitions

• the invention relates to a device for determining and / or
• the measuring medium can be either a gaseous or a liquid measuring medium.
• the flowmeter is either a clamp-on flowmeter or an in-line flowmeter that is installed in the piping.
• Ultrasonic flowmeters of the type described above which determine the volume flow by means of the so-called transit time difference method, are widely used in process and automation technology.
• clamp-on flowmeters have the advantage that they allow the volume flow in a container, e.g. in a pipeline, contactless and without contact with the medium to determine.
• Clamp-on flowmeters are described, for example, in EP 0 686 255 Bl, US Pat. No. 4,484,478, DE 43 35 369 C1, DE 298 03 911 U1, DE 4336370 C1 or US Pat. No. 4,598,593.
• the ultrasonic measurement signals are at a predetermined angle in the container in which the medium is irradiated or emitted from the container.
• the position of the ultrasonic transducers on the measuring tube (inline) or on the piping (clamp-on) depends on the inner diameter of the measuring tube and the speed of sound of the measuring medium.
• An essential component of an ultrasonic transducer is usually a piezoelectric element.
• the ultrasonic measuring signals generated or received by the piezoelectric element are transmitted via a coupling wedge or a flow body and, in the case of a clamp-on flow measuring device, via the pipe wall led into the interior of the pipe or the measuring tube.
• the two ultrasonic transducers are arranged so that the traversed sound paths are passed through the central region of the pipe or the measuring tube.
• the determined flow measurement thus reflects the average flow of the medium in the pipeline or in the measuring tube.
• this averaging is too inaccurate. Therefore, it has also become known in in-line flowmeters to provide a plurality of sensor pairs distributed over the circumference of the measuring tube to the measuring tube, whereby the flow information from different seg ⁇ ment convinced angular ranges of the measuring tube can be provided. It goes without saying that this solution is of course relatively expensive due to the large number of sensor pairs.
• the invention has for its object to provide an ultrasonic flow meter, which provides a segmented, dependent on the inner diameter of the pipe or the measuring tube flow rate available.
• the object is achieved in that at least one reflector element in
• the reflector element has a defined distance from the inner wall of the pipe and that the reflector element is arranged in a running through the pipe sound path of the ultrasonic measurement signals.
• the reflector element is designed and / or arranged such that it interrupts the sound path at points of interest for metrological purposes and deflects the ultrasonic measuring signals.
• the ultrasonic measurement signal carries only information from the traversed spatial area of the measuring tube or the pipeline.
• the solution according to the invention already comes with a pair of sensors to provide information about the flow profile of the measuring medium in the measuring tube. For the first time, it is also possible with the solution according to the invention to realize a multi-path clamp-on flowmeter.
• the reflector element or the reflector elements can be designed completely arbitrary.
• the at least one reflector element is a tubular element.
• the tubular element or the tubular elements are arranged concentrically in the pipeline.
• the tubular element or the tubular elements is fixed by webs on the inner wall of the pipe or the inner wall of the measuring tube is / are.
• This embodiment makes it possible to exclude certain edge areas from the measurement of the flow.
• the web acts as a sound conductor in this embodiment. Again, the sound conductor is broken at metrologically interesting points. This makes it possible, for example, a flow measurement only in the central or core region of the pipe or the measuring tube.
• the reflector element or the reflector elements are disk-shaped. Again, the reflector element or the reflector elements are fixed via one or more webs on the inner wall of the pipe or the measuring tube. In this case, reflector element and web / webs are configured substantially T-shaped.
• An advantageous development of the device according to the invention provides, in turn, for the ultrasound transducers and the webs to be arranged relative to one another such that the ultrasound measuring signals can be coupled in via the webs into the inner region of the tubular element or out of the inner region of the tubular element , With this configuration, the flow can be determined in a desired segment, since in each case the area in which the webs are located, is hidden from the flow measurement.
• the tubular element may also have an n-shaped cross-section, where n is a natural number with n> 3.
• the tubular n-cornered element is aus ⁇ designed so that its outer diameter substantially corresponds to the inner diameter of the pipe and that the tubular element in the region of the corners with the Pipeline is connected.
• the device is in the reflector element or the reflector elements to one or more disc-shaped platelets, which are designed and / or arranged so that they represent a negligible for the flowing medium flow resistance.
• a plurality of plates in the form of spatially offset stages of a conductor are arranged.
• an advantageous embodiment of the device according to the invention provides a control unit, via which the disk-shaped reflector plate or the disk-shaped reflector plate can be moved into the sound path and moved out of the sound path.
• the platelets are arranged either spirally, or they correspond to the rungs of an offset conductor structure.
• the ultrasonic measuring signals are transmitted and received at an opening angle matched to the respective application, a sensor pair is usually sufficient to provide the flow information from different segments of the pipe or of the measuring pipe in accordance with the invention.
• the ultrasonic transducers have a plurality of piezoelectric elements as transmitting and / or receiving elements, the transmitting and / or receiving elements being arranged in an array.
• the transmission and / or reception elements By suitable control of the transmission and / or reception elements, it is possible to realize different emission or reception angles and thus sound paths with different angular orientation.
• FIG. 1 shows a longitudinal section through a first embodiment of the device according to the invention with three ultrasonic sensors and a coupling / decoupling via webs, [0020] FIG.
• FIG. 1 a shows a cross section of the embodiment of the device according to the invention shown in FIG. 1;
• FIG. 2 shows a longitudinal section through a second embodiment of the device according to the invention with two ultrasonic sensors and a coupling / uncoupling via webs
• FIG. 2a shows a cross section of the embodiment of the device according to the invention shown in FIG. 2, FIG.
• FIG. 3 shows a longitudinal section through a third embodiment of the device according to the invention with two ultrasonic sensors and a tubular reflector with a round cross-section
• FIG. 3 a shows a cross section of the embodiment of the device according to the invention shown in FIG. 3, FIG.
• FIG. 4 shows a longitudinal section through a fourth embodiment of the device according to the invention with three ultrasonic sensors and a tubular reflector with a round cross-section, [0026] FIG.
• FIG. 4a shows a cross section of the embodiment of the device according to the invention shown in FIG. 4, FIG.
• FIG. 5 shows a longitudinal section through a fifth embodiment of the inventive device with three ultrasonic sensors and a tubular reflector with triangular cross-section
• FIG. 5a shows a cross section of the embodiment of the device according to the invention shown in FIG. 5, FIG.
• FIG. 6 shows a longitudinal section through a sixth embodiment of the device according to the invention with two ultrasonic sensors and a coupling in / out via webs of a T-shaped reflector
• FIG. 6a shows a cross section of the embodiment of the device according to the invention shown in FIG. 6;
• FIG. 7 shows a longitudinal section through a seventh embodiment of the device according to the invention with four ultrasonic sensors and a coupling in / out via webs of a T-shaped reflector, [0032] FIG.
• FIG. 7a shows a cross section of the embodiment of the device according to the invention shown in FIG. 7;
• FIG. 8 shows a longitudinal section through an eighth embodiment of the device according to the invention with a stationary and a displaceable ultrasound sensor and with reflector plates, [0034] FIG.
• FIG. 8a shows a cross section of the embodiment of the device according to the invention shown in FIG. 8;
• FIG. 9 shows a longitudinal section through a ninth embodiment of the device according to the invention with two ultrasonic sensors and with reflector plates which can be positioned in the sound path
• FIG. 9 a shows a cross section of the embodiment of the device according to the invention shown in FIG. 9.
• FIG. 1 shows a longitudinal section through a first embodiment of the invention according to the device 1 with three ultrasonic sensors 14a, 14b, 14c.
• the control of the ultrasonic transducers 14a, 14b, 14c and the evaluation of the ultrasonic measurement signals via the transit time method takes place in the control / evaluation unit 4.
• the tubular reflector element 5 with a round cross section is arranged concentrically within the pipeline / measuring tube 3.
• the tubular reflector element 5 has four webs 8 on its outer wall 7. About the webs 8, the tubular reflector element 5 is fixed to the inner wall 6 of the pipe / the measuring tube 3.
• the ultrasonic sensors 14a, 14b are arranged so that a part of the ultrasonic measurement signals via the webs 8a, 8c is switched on or coupled.
• the sound path S1 extends between the two ultrasonic transducers 14a, 14b arranged on a line to the longitudinal axis of the pipeline / measuring tube 3; the sound path S2 extends between the two mutually opposite ultrasonic transducers 14a, 14c.
• FIGS. 2 and 2a show different sections of a second embodiment of the device 1 according to the invention.
• This embodiment differs from the embodiment shown in FIG. 1 in that only two ultrasonic sensors 14a, 14b be used.
• the coupling in / out of the ultrasonic measurement signals takes place via webs 8, however, these webs 8 are due to the interrupted sound conduction are better readable measuring signals available. Again, the measurement is limited to the determination of the flow of the measuring medium 2 in the central region 16 of the pipe / the measuring tube.
• edge regions 17 defined in the embodiments illustrated in the FIGS. 1, 2 a, 2 a, 2 a, 2 b are not used in the determination of the flow rate. This is achieved by coupling and uncoupling the ultrasonic measuring signals via the webs 8 -, the solution shown in FIGS. 3 and 3a being limited to a determination of the flow in the edge region 17 In this solution, the ultrasound measurement signals emitted by an ultrasound transducer 14a, 1b are respectively reflected by the tubular reflector element 5 and received by the respective other ultrasound transducer 14b, 14a.
• the solution shown in FIGS. 4, 4a also has an additional, opposite ultrasonic transducer 14c.
• this solution it is possible to independently determine the flow of the measuring medium 2 in the pipeline / in the measuring tube 3, both for the edge region 17 and for the central region 16.
• the embodiment of the device 1 according to the invention shown in FIGS. 5 and 5 differs from the previously described embodiment (FIGS. 4, 4) by the shape of the reflector element 9: the reflector Gate element 9 has a triangular cross-section. The reflector element 9 is dimensioned such that it is fixed to the corner areas on the inner wall 6 of the pipeline / measuring tube 3.
• Figures 6, 6a, 7, 7a show different embodiments of the device 1 according to the invention, wherein it is the same for both that the Reflekto ⁇ rimplantation 10 are designed here T-shaped. The differences lie in the number and arrangement of the ultrasonic transducers 14.
• a plurality of reflector plates 11 are arranged in a ladder-shaped structure.
• the individual reflector plates 11 form the spatially offset rungs of the conductors 12.
• an alternative sees a corresponding one Displacement of at least one ultrasonic transducer 14a, 14b along the connecting line of the two ultrasonic transducers 14a, 14b before.
• a plurality of ultrasonic transducers 14 may also be provided at the marked positions.
• the ultrasonic transducers 14 may have a plurality of piezoelectric elements as transmitting and / or receiving elements, wherein the transmitting and / or receiving elements are arranged in an array.
• the Control / evaluation unit 4 By suitable control of the transmitting and / or receiving elements by the Control / evaluation unit 4, it is possible to realize different emission or Emp ⁇ catch angle and thus sound paths with different angular orientations.
• FIGS. 9 and 9a A final embodiment of the device 1 according to the invention is shown in FIGS. 9 and 9a.
• the reflector plates 11 are here so spaced and strung in a helix 13, that in each case a reflector plate 11 is rotated by turning the helix 13 about its longitudinal axis in the sound path of the ultrasonic transducer 14a, 14b.
• the rotation of the helix can take place either stepwise or continuously.
• FIG. 5 tubular reflector element with round cross section
• FIG. 7 outer wall of the tubular reflector element
• FIG. 9 tubular reflector element with triangular cross-section

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• 2004
  • 2004-11-03 DE DE102004053673A patent/DE102004053673A1/de not_active Withdrawn
• 2005
  • 2005-10-25 WO PCT/EP2005/055553 patent/WO2006048395A1/de active Application Filing
  • 2005-10-25 CN CNA2005800382109A patent/CN101076709A/zh active Pending
  • 2005-10-25 US US11/666,659 patent/US7448282B2/en not_active Expired - Fee Related
  • 2005-10-25 EP EP05808181A patent/EP1807680A1/de not_active Withdrawn
  • 2005-10-25 RU RU2007120505/28A patent/RU2354938C2/ru not_active IP Right Cessation

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