• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention relates to an ultrasonic flow measuring device (10) comprising a measuring tube (12) with a raw wall (14) having a raw cross-sectional area (16) and a plurality of ultrasonic sensors (28). According to the invention, ultrasound transducers and / or ultrasound radiating elements of the ultrasound sensors (28) are aligned in the vertical direction (58) and arranged in a plurality of steps (30) integrated in the rough wall (14), leading edges of the steps (30) being in a contiguous axial direction Area which comprises at least one axial dimension of the ultrasonic sensor (28) or the ultrasonic sensors (28), parallel to a central axis of the measuring tube (12) extend. A plurality of the integrated steps (30) has at least in the contiguous axial region in a cross-sectional area in each case one of the Rohquerschnittsfläche (16) inwardly projecting surface part and from the Rohquerschnittsfläche (16) outwardly projecting surface part, the surface areas substantially equal in terms of amount ,
    公开号:CH714430A2
    申请号:CH01524/17
    申请日:2017-12-14
    公开日:2019-06-14
    发明作者:Hesse Kilian
    申请人:Stebatec Ag；
    IPC主号:
    专利说明:

    Description TECHNICAL FIELD The present invention relates to an ultrasonic flow measuring device according to the preamble of claim 1, including a measuring tube having a raw wall having a raw cross-sectional area, and a plurality of ultrasonic sensors.
    BACKGROUND OF THE INVENTION In the field of measuring the flow of a flowing medium flowing, for example, in a channel, a partially filled or a completely filled pipeline, the use of flow meters is known in which ultrasonic sensors mounted in a measuring tube are used , For example, according to the known Doppler principle or the principle of the transit time difference, to determine a speed of the flowing medium. From the determined speed and the known geometry of the measuring tube, a flow rate can be calculated after determining a filling level of the medium in the measuring tube.
    In some of the known flowmeters, at least one ultrasonic sensor is positioned in a specially provided recess in an inner wall of the measuring tube, which is in fluid communication with the measuring tube. In such flow meters, it is known that a disturbance in the spatial velocity distribution of the flowing medium, such as through the formation of vortices, is produced by the depression. The disturbance of the spatial velocity distribution leads to a systematic measurement error in the flow measurement, since a speed distribution assumed in the calculation of the flow rate is not exactly maintained.
    In the prior art, various ways of solving this problem have been proposed. In a first approach, an attempt is made to reduce the disturbance of the spatial velocity distribution due to the ultrasonic sensors arranged on the inner wall of the measuring tube by installing suitable devices.
    For example, in the patent DE 19 648 784 C2 proposes a solution in which at least at input openings of the wells equipped with ultrasonic sensors recesses are provided which have meshes, which should lead on the one hand to a reduction of the vertebrae and on the other hand to an increase in the Frequency of the still occurring vortices, which are harmless for the flow measurement.
    In addition, a flow meter is described in the international application WO 2012/084 392 A1, in which at least one baffle is provided in the bore of the measuring tube in a bore of a measuring tube which receives an ultrasonic transducer with ultrasonic windows. The baffle is disposed in front of the ultrasonic window and perpendicular to the ultrasonic window, whereby the formation of flow vortices is hindered at the bore.
    Furthermore, in the published patent application DE 10 2014 004 747 A1, a cylindrical shield is provided on a converter pocket, which is preferably tubular and is intended to reduce the formation of flow vortices without influencing the propagation of the ultrasonic signal.
    In a further known in the prior art approach is trying to reduce the disturbance of the spatial velocity distribution due to the ultrasonic sensors used for flow measurement by a suitable design of the measuring tube and / or a suitable arrangement of the ultrasonic sensors in the measuring tube to a trouble-free flow as possible to reach the medium through the measuring tube.
    For example, Offenlegungsschrift DE 3 539 948 A1 describes an ultrasonic flow measuring device with a tube made of metal, which essentially has a rectangular inner cross section. Ultrasonic waves impinging on sidewalls of the pipe are reflected, resulting in a reduction in the dependence of the measurement result on the airfoil.
    Furthermore, the European patent EP 2172 657 B1 describes a flow straightener for an ultrasonic flowmeter. The flow straightener is arranged to be located at an inlet of a measuring tube and adapted to fluidize a laminar flow at the inlet of the measuring tube while a turbulent flow directs the flow straightener almost unhindered, i. without the known undesirable pressure loss, can happen.
    An ultrasonic flowmeter for fluids with a measuring tube, with which an optimal speed profile is achieved and thus parasitic waves to be reduced, is proposed in the European patent application EP 1096 236 A2. The measuring tube with flat walls has chambers, which are installed in one of these walls. In the chambers ultrasonic transducers and reflectors are arranged. Reflection on the reflectors in the chambers gives the sound field the desired shape.
    In a further known in the prior art approach is proposed to take into account the disturbance of the spatial velocity distribution due to the ultrasonic sensors used for flow measurement by flow velocities measured at different depths of a flow profile and the measured flow velocities are taken into account in determining the flow rate, instead to calculate a mean flow velocity when calculating the flow rate.
    For example, in the patent DE 19 633 558 C2 describes an ultrasonic flow measurement method for flowing media, in which from a Doppler shift of the inhomogeneities contained in the flowing medium along a measurement path reflected ultrasonic pulses and the duration of the reflected ultrasonic pulses, a flow profile the flowing medium is determined and the value for the average flow velocity is corrected on the basis of the flow profile obtained in this way.
    Although the known ultrasonic flowmeters and ultrasonic flow measurement methods for measuring the flow of a flowing medium perform a desired function, the technical field of measuring flow rates of a flowing medium still offers room for improvement.
    OBJECT OF THE INVENTION It is therefore an object of the present invention to provide an ultrasonic flowmeter which has a reduced systematic measurement error in determining the flow rate due to a disturbance in the spatial velocity distribution of the medium in the flowmeter.
    General Description of the Invention According to the invention, the object is achieved by having the features of claim 1. Further, particularly advantageous embodiments of the invention disclose the dependent subclaims.
    The individual features that are listed in this description can also be combined with each other in any technically meaningful way and represent further embodiments of the invention. The description additionally characterizes and specifies the invention, in particular in connection with the figures.
    The inventive ultrasonic flow measuring device includes a measuring tube with a Rohwandung having a Rohquerschnittsfläche, and a plurality of ultrasonic sensors. In this case, ultrasound transducers and ultrasound-emitting elements of the ultrasound sensors are mostly aligned in the vertical direction and arranged in a plurality of steps integrated in the rough wall. Leading edges of the steps extend in a contiguous axial region comprising at least one axial dimension of the ultrasonic sensor or sensors parallel to a central axis of the measuring tube and a plurality of the steps at least in the contiguous axial region in a cross-sectional area one after each other from the raw cross-sectional area inside projecting surface part and one of the raw cross-sectional area outwardly projecting surface part, the surface area substantially equal in terms of amount.
    The term "plurality" should be understood in the context of the invention, in particular a number of at least two. For the purposes of the invention, the term "plurality" is to be understood as meaning, in particular, a proportion of more than 50% of a number.
    The term "ultrasonic sensor" is to be understood in the context of the invention, in particular a sensor which includes at least one ultrasound-converting element and / or at least one ultrasound-emitting element.
    In the sense of the invention, an "axial direction" is to be understood as meaning in particular a direction which is arranged parallel to a central axis of the measuring tube. For the purposes of the invention, an "axial region" is to be understood as meaning in particular an area in the axial direction. In the sense of the invention, an "axial dimension" is to be understood in particular to mean a dimension in the axial direction.
    In this way, an ultrasonic flow measuring device can be provided in which a layer of the medium from a filling level of the flowing medium in the measuring tube, which extends from a foot one of the integrated stages to the upper edge of the same integrated stage, the same cross-sectional area as a layer of the medium at this level in the measuring tube without the presence of the integrated stage. Since this is true for any integrated stage of the plurality of integrated stages, a cross-sectional area of the flowing medium for certain fill levels in the meter tube is equal to a cross-sectional area of the flowing medium at those fill levels without the presence of the plurality of integrated stages. An approximate equality of the cross-sectional areas applies to any fill levels the better, the smaller a height of the steps is formed in the vertical direction.
    This can ensure that a change in a spatial velocity distribution of the medium flowing through the measuring tube compared to a measuring tube without integrated stages and arranged in the stages ultrasonic sensors kept at least very low or even as good as can be avoided and in this way Measurement conditions are achievable, which allow a small systematic error in determining the flow rate.
    Another advantage of the inventive ultrasonic flow measuring device is that in a suitable embodiment, determinations of a flow rate of the flowing medium in the measuring tube, in particular at teilgefülltem measuring tube, are made possible at different heights, the flow velocities in these heights without the presence of the integrated Stages and thus correspond to the ultrasonic sensors. The flow velocities determined at the different heights can be used for plausibility considerations and a reduction in the measurement error of the flow measurement.
    The inventive ultrasonic flow measuring device is particularly advantageous for partially filled, closed pipes applicable.
    Preferably, the raw cross-sectional area is annular. The raw cross-sectional area may generally be delimited by two elliptical boundary lines, the circular ring shape being a special embodiment with two elliptical boundary lines formed by circular lines.
    In preferred embodiments of the ultrasonic flow measuring device, the ultrasound-transmitting and / or ultrasound-radiating elements of the ultrasonic sensors are aligned horizontally on an inner wall of the measuring tube and spaced along a circumferential direction and / or in the axial direction of the measuring tube. In this way, a determination of an undisturbed in spite of the presence of the ultrasonic sensors speed-height profile of the flowing medium in the measuring tube without mutual interference of the ultrasonic sensors can be made possible.
    Preferably, the ultrasound-converting and / or ultrasound-radiating elements of at least one pair of ultrasonic sensors of the plurality of ultrasonic sensors are aligned in a horizontal direction and arranged opposite one another on the inner wall of the measuring tube. In this way, an easily feasible determination of the speed-height profile of the flowing medium in the measuring tube can be achieved according to the principle of the transit time difference.
    When the ultrasound-transmitting and / or ultrasound-radiating elements of the ultrasonic sensors are spaced along the circumferential direction such that adjacent ultrasound-converting and / or ultrasound-radiating elements in the circumferential direction have a predetermined, equal mutual distance in a vertical direction, a determination of a despite the presence of the ultrasonic sensors undisturbed speed-height profile of the medium flowing in the measuring tube are carried out in uniformly spaced heights of the flowing medium.
    In preferred embodiments of the ultrasonic flowmeter, the ultrasound-transmitting and / or ultrasound-radiating elements of the plurality of ultrasonic sensors are arranged in steps of the plurality of integral on the Rohwandung integrated steps in the vertical direction up to a maximum height which is at least 75% of an inner Diameter of the Rohwandung corresponds. In this way, the determination of the undisturbed speed-height profile of the medium flowing in the measuring tube and the flow rate through the proposed ultrasonic flow measuring device in a wide range of flow capacity of the measuring tube is feasible.
    Particularly preferably, the ultrasound-transmitting and / or ultrasound-radiating elements of the plurality of ultrasonic sensors are arranged in stages of the plurality of arranged on the Rohwandung integrated steps in the vertical direction from a lowest point of the measuring tube starting up to the maximum height. Thereby, the determination of the flow rate of the medium flowing in the measuring tube by the proposed ultrasonic flow measuring device is made possible even at very low flow rates.
    The term "very low flow rate" is to be understood in the context of this invention, in particular a flow rate that is less than 20%, preferably less than 15%, and, more preferably, less than 10% of a maximum flow capacity of the measuring tube.
    In preferred embodiments of the ultrasonic flow measuring device, arranged on the Rohwandung, integrated stages have a step depth, which steadily decreases from a maximum step depth at the location of the ultrasonic sensor or the ultrasonic sensors to a minimum step depth at the ends of the measuring tube. In this way, a disturbance of a local velocity distribution within the flowing medium in the measuring tube due to the integrated stages can be counteracted particularly effective.
    Preferably, the minimum step depth at ends of the measuring tube is substantially zero. For the purposes of this invention, "substantially zero" is to be understood in particular to mean that the minimum step depth is less than 20%, preferably less than 15%, and, with particular preference, less than 10% of the maximum step depth. As a result, the medium flowing in the measuring tube can be guided past the integrated stages and thus to the ultrasonic sensors in a particularly trouble-free manner.
    Preferably, the step depth of a maximum step depth at the location of the ultrasonic sensor or the ultrasonic sensors to the minimum step depth at the ends of the measuring tube is formed strictly monotone decreasing. The term "strictly monotone decreasing" should be understood in the mathematical sense, d. H. Whenever a position in the axial direction is changed, the step depth should assume a different value. In this way, the medium flowing in the measuring tube can flow along the integrated stages and thus along the ultrasonic sensors in a particularly low-interference manner.
    For example, the step depth may decrease linearly from the maximum step depth at the location of the ultrasonic sensor or the ultrasonic sensors to the minimum step depth at the ends of the measuring tube. For example, the step depth can also be formed in such a strictly monotonically decreasing manner that the step has a convex or concave curvature from the maximum step depth to the minimum step depth.
    In preferred embodiments of the ultrasonic flow measuring device, the leading edges of the steps in the cross-sectional area of straight and circular arc-shaped sections can be displayed assembled. In this way, the medium flowing in the measuring tube can flow along the integrated stages and thus along the ultrasonic sensors in a particularly low-interference manner.
    Preferably, the Rohwandung of the measuring tube and the plurality of integrated stages to a übenwiegenden share of a plastic material. As a result, these components can be produced in the desired dimensional accuracy and in a material-saving and cost-effective manner. For the purposes of the invention, the term "to a predominant part" is to be understood as meaning in particular a proportion of more than 70% by volume, preferably more than 80% by volume and, with particular preference, more than 90% by volume. In particular, the term should include the possibility that the said objects are completely, i. H. to 100 vol.%, Made of the plastic material.
    In preferred embodiments of the ultrasonic flow measuring device, a ratio of the axial length of the measuring tube to a largest dimension of the measuring tube perpendicular to the axial direction is at least 1.5, and a majority of the plurality of ultrasonic sensors is in the axial direction in a central region of the measuring tube arranged, which has a length in the axial direction corresponding to at most one half of the axial length of the measuring tube. As a result, within the measuring tube an inlet section and an outlet section for decaying in front of the measuring tube in the flowing medium potentially existing interference within the measuring tube desired velocity distribution and to avoid repercussions of potentially occurring after the measuring tube in the flowing medium disturbances on one within the measuring tube desired speed distribution can be provided.
    Brief Description of the Figures Further advantages will become apparent from the following description of the drawings. In the drawing, an embodiment of the invention is shown. The drawing, the description and the claims contain numerous features in combination. The skilled person will conveniently consider the features individually and summarize meaningful further combinations.
    In the drawings: [0041]
    1 is a schematic representation of the ultrasonic flow measuring device in a perspective view,
    2 shows a schematic side view of the ultrasonic flow measuring device according to FIG. 1 in a longitudinal section,
    Fig. 3 is a schematic, sectional front view of the ultrasonic flow measuring device according to the Fig. 1, and
    4 shows a schematic representation of a detail of the sectioned front view of the ultrasonic flow measuring device according to FIG. 1.
    In the different figures, the same parts are always provided with the same reference numerals and are therefore usually described only once.
    DETAILED DESCRIPTION OF THE INVENTION [0043] FIG. 1 shows a schematic representation of a possible embodiment of the ultrasonic flow measuring device 10 according to the invention in a perspective view, and FIG. 2 shows a schematic side view in the form of a longitudinal section. The illustrated embodiment of the ultrasonic flow measuring device 10 is provided in particular for an application with partially filled pipes.
    The ultrasonic flow measuring device 10 includes a cylindrical measuring tube 12 with a Rohwandung 14 (FIG. 3), which has an annular Rohquerschnittsfläche 16. An inner diameter 22 of the existing predominantly of a plastic material raw wall 14 is about 260 mm. A ratio of an axial length 26 of the measuring tube 12 to the inner diameter 22 of the raw wall 14 that is determinable relative to a central axis 18 (FIG. 2) of the measuring tube 12, which represents a largest dimension of the measuring tube 12 perpendicular to an axial direction 60, is more than 1.5, namely about 1.75. FIG. 1 shows a flow direction 20 provided for a medium (not shown) flowing through the measuring tube 12.
    In this particular embodiment of the ultrasonic flow measuring device 10, the cylindrical measuring tube 12 is disposed between two annular flanges 42,44, wherein between each of two end faces of the measuring tube 12 and one of the flanges 42, 44 an elastomeric seal 46, 48 is provided is (Fig. 2). The flanges 42, 44 are in an operational state of the ultrasonic flow measuring device 10 by a plurality of circumferentially uniformly spaced and parallel to the central axis 18 of the measuring tube 12 arranged tie rods 50, which as
    Threaded rods are formed, braced with the elastomeric seals 46, 48 against the two end faces of the measuring tube 12.
    At outwardly facing end faces, the flanges 42,44 are equipped with a plurality of fasteners 52 (Fig. 1). The fastening elements 52 are designed as threaded bores and serve for fastening pipelines to the ultrasonic flow measuring device 10.
    FIG. 3 shows a schematic front view of the ultrasonic flow measuring device 10 according to FIG. 1 in an intended use position relative to the vertical direction 58 and to the horizontal direction 62.
    In the Rohwandung 14 of the measuring tube 12, a plurality of twelve integrated stages 30 is arranged, which are made of the same plastic material as the Rohwandung 14 and in the intended use position each with respect to the vertical direction 58 above and below , Level top 32 and a vertically oriented side surface 34 have.
    The ultrasonic flow measurement device 10 further includes a plurality of twenty ultrasonic sensors 28. Each of the ultrasonic sensors 28 has an ultrasonic-converting and an ultrasonic-radiating element.
    The ultrasound-transmitting and ultrasound-radiating elements of all ultrasonic sensors 28 of the plurality of twenty ultrasonic sensors 28 are aligned in the vertical direction 58 and arranged in one of the 12 integrated in the Rohwandung 14 stages 30. As best seen in FIG. 2, all the ultrasonic sensors 28 of the plurality of twenty ultrasonic sensors 28 are arranged in a central region 24 of the measuring tube 12 when viewed in the axial direction 60, the central region 24 having a length in the axial direction 60 , which corresponds to less than one half, namely about 40%, of the axial length 26 of the measuring tube 12.
    As can be seen from FIG. 3, each integrated stage 30 of the plurality of twelve integrated stages 30 is arranged in the intended use position such that the ultrasound-transmitting and ultrasound-radiating elements of the ultrasonic sensors 28 are aligned in the horizontal direction 62 on an inner wall of the measuring tube 12 and along a circumferential direction 64 of the measuring tube 12 are arranged spaced from each other.
    The spacing of the ultrasound-transmitting and ultrasound-emitting elements of the ultrasonic sensors 28 along the circumferential direction 64 of the measuring tube 12 is selected such that in the circumferential direction 28 adjacent ultrasound-transmitting and ultrasound radiating elements in the vertical direction 58 have a predetermined, equal mutual distance (Fig. 2). The integrated stages 30 of the plurality of twelve integrated stages 30 with the ultrasonic sensors 28 of the plurality of twenty ultrasonic sensors 28 arranged therein are arranged in the vertical direction 58 from a lowest point of the measuring tube to a maximum height which is approximately 100% of the inner diameter 22 the Rohwandung 14 corresponds (Fig. 3).
    In some integrated stages 30 of the plurality of integrated in the Rohwandung 14 stages 30 two of the ultrasonic sensors 28 are arranged (Fig. 2), which are spaced apart in the axial direction 60 of the measuring tube 10 from each other. They can be used, for example, to determine the speed of the medium flowing through the measuring tube 12 according to the principle of the transit time difference.
    The indicated in Fig. 2 ten positions of the ultrasonic sensors 28 are provided on both sides of the inner wall of the measuring tube 12, so that the ultrasonic and ultrasound radiating elements of a plurality of pairs of ultrasonic sensors 28 of the plurality of ultrasonic sensors 28 in the horizontal direction 62 aligned and are arranged opposite one another on the inner wall of the measuring tube 12.
    From the arrangement of the ultrasonic sensors 28 within the measuring tube 12 results in a variety of ways to determine the speed of the medium flowing through the measuring tube 12, for example, according to the principle of the transit time difference or the Doppler principle. Methods known per se for determining the speed of the medium flowing through the measuring tube 12 with the ultrasonic sensors 28 are known in the prior art and therefore need not be described in detail at this point.
    To determine a filling level of the medium within the measuring tube 12, a filling level sensor 54 operating according to the radar principle is provided, which is integrated in the ultrasonic flow measuring device 10. For controlling the ultrasonic sensors 28, for detecting signals from the ultrasonic sensors 28 and for determining velocities of the flowing medium from the signals of the ultrasonic sensors 28, the ultrasonic flow measuring device 10 has a control and evaluation unit 56, which is connected to the ultrasonic sensors 28 in terms of data. The control and evaluation unit 56 is also connected to the level sensor 54 in terms of data and provided to read out data of the level sensor 54. The control and evaluation unit 56 is further provided to calculate from the various specific speeds of the flowing medium and the data of the level sensor 54, a flow rate of the medium flowing through the measuring tube 12.
    In a continuous axial region of each of the integrated stages 30, which includes an axial dimension of the ultrasonic sensor 28 disposed in the respective stage 30 or the ultrasonic sensors 28 disposed in the respective stage 30, leading edges 36 of the respective integrated stage 30 of the plurality of twelve integrated steps 30 parallel to a central axis 18 of the measuring tube 12 (Figures 1 and 4).
    A step depth of the arranged on the Rohwandung 14 integrated steps 30 is given by a dimension of the top 32 of the respective integrated stage 30 in the horizontal direction 62 (Fig. 4). In each of the integrated stages 30, the step depth at the location of the ultrasonic sensor 28 or the ultrasonic sensors 28 is maximum and decreases up to a minimum step depth at the ends of the measuring tube 12 steadily and strictly monotone decreasing, namely linear (Fig. 1), wherein the minimum Step depth has a value of zero, ie the front edge 36 of each of the integrated stages 30 is continuously transferred to the raw wall 14 at the ends of the measuring tube 12.
    As can be seen most clearly in the schematic illustration of a section 3A of the sectional front view of the ultrasonic flowmeter 10 in FIG. 4, each of the integrated stages 30 of the plurality of integrated stages 30 has one in the contiguous axial region in a cross-sectional area from the Rohquerschnittsfläche 16 inwardly projecting surface portion 38 and from the Rohquerschnittsfläche 16 outwardly projecting surface portion 40 on. An area of the inwardly projecting surface portion 38 and an area of the outwardly projecting surface portion 40 agree in terms of amount.
    In this case, the leading edges 36 of the integrated steps 30 in the cross-sectional area of straight and arcuate sections are displayed together, whereby the flowing medium in the measuring tube 12 can flow past the leading edges 36 of the integrated stages 30 particularly low interference.
    A preparation of the measuring tube 12 with the integrated in the Rohwandung 14 stages 30 and arranged in the integrated stages 30 ultrasonic sensors 28 can be done, for example, that in the measuring tube 12 with the Rohwandung 14 equipped with holders for the ultrasonic sensors 28 negative mold is introduced (not shown) of the integrated stages 30 and sealed to one or more filling openings and at least one vent to the outside. Subsequently, for example, a plastic material formed from uncured resin can be introduced into the intermediate space between the raw wall 14 and the negative mold, so that after curing has taken place, a cohesive connection of the introduced plastic material with the raw wall 14 and the holders for the ultrasonic sensors 28 is produced. After curing, the measuring tube 12 can be fitted to the holders provided with the ultrasonic sensors 28.
    Explanation of symbols: [0062] 10 Ultrasonic Flow Measuring Device 12 Measuring Tube 14 Raw Wall 16 Raw Cross Section 18 Central Axis 20 Flow Direction 22 Inner Diameter 24 Middle Section 26 Axial Length 28 Ultrasonic Sensor 30 Integrated Step 32 Top 34 Side Face 36 Leading Edge 38 Inwardly projecting surface portion 40 Outwardly facing surface portion 42 Flange 44 Flange 46 Elastomer seal 48 Elastomer seal 50 Tie rod 52 Fastening element 54 Level sensor 56 Control and evaluation unit 58 Vertical direction 60 Axial direction 62 Horizontal direction 64 Circumferential direction
    权利要求:
    Claims (11)
    [1]
    An ultrasonic flow measuring device (10), comprising - a measuring tube (12) having a raw wall (14), which has a raw cross-sectional area (16), - a plurality of ultrasonic sensors (28), characterized in that - ultrasound-converting and / or ultrasound-emitting Elements of the ultrasonic sensors (28) are aligned in the vertical direction (58) and are arranged in a multiplicity of steps (30) integrated in the rough wall (14), leading edges (36) of the steps (30) being arranged in a continuous axial region at least one axial dimension of the ultrasonic sensor (28) or the ultrasonic sensors (28) parallel to a central axis (18) of the measuring tube (12) extend, and that - a plurality of integrated stages (30) at least in the continuous axial region in one Cross-sectional area in each case one of the Rohquerschnittsfläche (16) inwardly projecting surface portion (38) and one of the Rohquerschnittsfläche (16) nac h outwardly projecting surface part (40), the surface areas substantially equal in terms of amount.
    [2]
    2. Ultrasonic flow measuring device (10) according to claim 1, wherein the ultrasound-transmitting and / or ultrasound-radiating elements of the ultrasonic sensors (28) in a horizontal direction (62) aligned with an inner wall of the measuring tube (12) and along a circumferential direction (64) and / or in the axial direction (60) of the measuring tube (12) are arranged spaced from each other.
    [3]
    The ultrasonic flowmeter (10) according to claim 1 or 2, wherein the ultrasound-transducing and / or ultrasound-radiating elements of at least one pair of ultrasonic sensors (28) of the plurality of ultrasonic sensors (28) are aligned in a horizontal direction (62) and opposed to each other on the inner wall of the measuring tube (12) are arranged.
    [4]
    The ultrasonic flowmeter (10) of any one of the preceding claims, wherein the ultrasound-transmitting and / or ultrasound-radiating elements of the ultrasonic sensors (28) are spaced along the circumferential direction (64) such that adjacent ultrasound-transducing in the circumferential direction (64) and / or ultrasound radiating elements in a vertical direction (58) have a predetermined, equal mutual distance.
    [5]
    The ultrasonic flowmeter (10) of any one of the preceding claims, wherein the ultrasound-converting and / or ultrasound-radiating elements of the plurality of ultrasonic sensors (28) are integrated in the integrated stages (30) of the plurality of integral with the rough wall (14) Stages (30) are arranged in the vertical direction (58) from a lowest point of the measuring tube (12) to a maximum height corresponding to at least 75% of an inner diameter (22) of the Rohwandung (14).
    [6]
    6. Ultrasonic flow measuring device (10) according to one of the preceding claims, wherein the on the Rohwandung (14) arranged, integrated steps (30) have a step depth of a maximum step depth at the location of the ultrasonic sensor (28) or the ultrasonic sensors (28 ) steadily decreases to a minimum step depth at the ends of the measuring tube (12).
    [7]
    The ultrasonic flowmeter (10) of claim 6, wherein the minimum step depth at the ends of the meter tube (12) is substantially zero.
    [8]
    8. Ultrasonic flow measuring device (10) according to claim 6 or 7, wherein the step depth of a maximum step depth at the location of the ultrasonic sensor (28) or the ultrasonic sensors (28) to the minimum step depth at the ends of the measuring tube (12) formed strictly monotone decreasing is.
    [9]
    9. ultrasonic flow measuring device (10) according to any one of the preceding claims, wherein the leading edges (36) of the integrated stages (30) in the cross-sectional area of straight and circular arc-shaped sections are represented assembled.
    [10]
    10. Ultrasonic flow measuring device (10) according to any one of the preceding claims, wherein the Rohwandung (14) of the measuring tube (12) and the plurality of integrated stages (30) consist for the greater part of a plastic material.
    [11]
    11. Ultrasonic flow measuring device (10) according to one of the preceding claims, wherein a ratio of the axial length (26) of the measuring tube (12) to a maximum dimension of the measuring tube (12) perpendicular to the axial direction (60) is at least 1.5 and a majority of the plurality of ultrasonic sensors (28) is arranged in the axial direction (60) in a central region (24) of the measuring tube (12) having a length in the axial direction (60) which is at most one half of the axial length (26 ) of the measuring tube (12) corresponds.
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    同族专利:
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    NO2744977T3|2015-04-14|2018-07-21|
    JP2017015475A|2015-06-30|2017-01-19|パナソニックＩｐマネジメント株式会社|Measuring unit and flow meter|
    KR101833543B1|2017-09-08|2018-03-02|한국환경공단|Sewage flow measurment device for partially filled pipe coinciding low carbon|
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    申请号 | 申请日 | 专利标题
    CH01524/17A|CH714430B1|2017-12-14|2017-12-14|Ultrasonic flow measuring device with flow-optimized measuring tube.|CH01524/17A| CH714430B1|2017-12-14|2017-12-14|Ultrasonic flow measuring device with flow-optimized measuring tube.|
    EP18212468.5A| EP3505875B1|2017-12-14|2018-12-13|Ultrasound flow meter with flow-optimised measuring tube|
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