EP4264194A1 - Capteur pour détecter des variations de pression dans un fluide en écoulement et système de mesure formé dudit capteur - Google Patents

Capteur pour détecter des variations de pression dans un fluide en écoulement et système de mesure formé dudit capteur

Info

Publication number
EP4264194A1
EP4264194A1 EP21840843.3A EP21840843A EP4264194A1 EP 4264194 A1 EP4264194 A1 EP 4264194A1 EP 21840843 A EP21840843 A EP 21840843A EP 4264194 A1 EP4264194 A1 EP 4264194A1
Authority
EP
European Patent Office
Prior art keywords
sensor
deformation body
compensating
deformation
connecting sleeve
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP21840843.3A
Other languages
German (de)
English (en)
Inventor
Christian Lais
Pierre Ueberschlag
Achim Wiest
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Endress and Hauser Flowtec AG
Original Assignee
Endress and Hauser Flowtec AG
Flowtec AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Endress and Hauser Flowtec AG, Flowtec AG filed Critical Endress and Hauser Flowtec AG
Publication of EP4264194A1 publication Critical patent/EP4264194A1/fr
Pending legal-status Critical Current

Links

Classifications

    • 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
    • G01F1/05—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 using mechanical effects
    • G01F1/20—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 using mechanical effects by detection of dynamic effects of the flow
    • G01F1/32—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 using mechanical effects by detection of dynamic effects of the flow using swirl flowmeters
    • G01F1/325—Means for detecting quantities used as proxy variables for swirl
    • G01F1/3259—Means for detecting quantities used as proxy variables for swirl for detecting fluid pressure oscillations
    • 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
    • G01F1/05—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 using mechanical effects
    • G01F1/20—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 using mechanical effects by detection of dynamic effects of the flow
    • G01F1/32—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 using mechanical effects by detection of dynamic effects of the flow using swirl flowmeters
    • G01F1/325—Means for detecting quantities used as proxy variables for swirl
    • G01F1/3259—Means for detecting quantities used as proxy variables for swirl for detecting fluid pressure oscillations
    • G01F1/3266—Means for detecting quantities used as proxy variables for swirl for detecting fluid pressure oscillations by sensing mechanical vibrations
    • 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
    • G01F1/05—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 using mechanical effects
    • G01F1/20—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 using mechanical effects by detection of dynamic effects of the flow
    • G01F1/32—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 using mechanical effects by detection of dynamic effects of the flow using swirl flowmeters
    • G01F1/3209—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 using mechanical effects by detection of dynamic effects of the flow using swirl flowmeters using Karman vortices
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
    • G01F15/006—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus characterised by the use of a particular material, e.g. anti-corrosive material

Definitions

  • the invention relates to a sensor formed for detecting pressure fluctuations in a flowing fluid and a measuring system formed therewith.
  • Examples of such measuring systems are, inter alia, from US-A 2006/0230841, US-A 2008/0072686, US-A 2011/0154913, US-A 2011/0247430, US-A 2016/0123783, the US-A 2017/0284841, US-A 2019/0094054, US-A 60 03 384, US-A 61 01 885, US-B 63 52 000, US-B 69 10 387 or US B 69 38 496 and are also offered by the applicant itself, for example under the product name "PROWIRL D 200", “PROWIRL F 200", “PROWIRL O 200", “PROWIRL R 200" (http://www.de .endress.eom/#products/prowirl).
  • the measuring systems shown each have a bluff body protruding into the lumen of the respective pipeline, for example designed as a system component of a heat supply network or a turbine circuit, or into a lumen of a measuring tube inserted in the course of that pipeline, and thus against which the fluid flows, for generating a so-called Kärmänschen vortex street lined up vortices within the partial volume of the fluid stream flowing immediately downstream of the bluff body.
  • the vortices are generated at the bluff body with a shedding rate (1/fvtx) that is dependent on the flow velocity.
  • the measuring systems have a sensor integrated into the bluff body or connected to it or downstream thereof, namely in the area of the Karman vortex street in the flow, thus in the lumen of the protruding sensor, which serves for pressure fluctuations in the Karman vortex street formed in the flowing fluid and to convert it into a sensor signal representing the pressure fluctuations, namely to supply a - for example electrical or optical - signal which corresponds to a pressure prevailing within the fluid and which is subject to periodic fluctuations as a result of vortices running in opposite directions downstream of the bluff body, or which corresponds to the separation rate the vortex has the corresponding signal frequency ( ⁇ fvtx).
  • the senor has a deformation body and a mostly rod-shaped, plate-shaped or wedge-shaped - sensor vane, and is set up to detect pressure fluctuations in the Karman vortex street, namely to convert them into movements of the deformation body that correspond to the pressure fluctuations.
  • the deformable body has an outer edge segment - usually in the shape of a circular ring - which is set up to be connected to a socket serving to hold the deformable body on a wall of a pipe in a hermetically sealed manner, for example materially, such that the deformable body has a the opening provided in the tube is covered or hermetically sealed and that the surface of the deformation body carrying the sensor vane faces the fluid-carrying lumen of the measuring tube or pipeline, and the sensor vane therefore protrudes into the same lumen.
  • the deformation body is typically designed as a thin membrane and is shaped in such a way that at least one membrane thickness, measured as a minimum thickness of an inner membrane segment delimited by the aforementioned outer edge segment, is very much smaller than a membrane diameter, measured as a largest diameter is an area bounded by the outer edge segment.
  • a membrane thickness measured as a minimum thickness of an inner membrane segment delimited by the aforementioned outer edge segment
  • a membrane diameter measured as a largest diameter is an area bounded by the outer edge segment.
  • sensors of the type in question can occasionally combine with one another starting from a surface of the deformation body facing away from the surface of the deformation body that is mostly rod-, plate- or sleeve-shaped, which is used in particular to compensate forces or moments resulting from movements of the sensor assembly, for example as a result of vibrations in the pipeline to compensate or to avoid the resulting undesired movements of the sensor vane.
  • each of the sensors also includes a (mechanical-to-electrical) converter element, which is typically set up to detect movements of the deformation body and to convert them into an electrical sensor signal.
  • a (mechanical-to-electrical) converter element typically set up to detect movements of the deformation body and to convert them into an electrical sensor signal.
  • the same transducer element is formed by means of a piezoceramic, for example in the form of a piezo disc.
  • the senor On a side facing away from the fluid-carrying lumen, the sensor is also connected to converter electronics—typically encapsulated in a pressure and impact-resistant manner and possibly also hermetically sealed to the outside.
  • Converter electronics typically have a corresponding digital measuring circuit, which is electrically connected to the converter element via connection lines, if necessary with the interposition of electrical barriers and/or galvanic isolation points, for processing the at least one sensor signal generated by the converter element and for generating digital measured values for the measured variable to be recorded in each case, namely the flow velocity, the volume flow and/or the mass flow.
  • the converter electronics usually housed in a protective housing made of metal and/or impact-resistant plastic, of measurement systems suitable for industry or established in industrial measurement technology also usually provide external interfaces for communication with higher-level systems that conform to an industry standard, for example DIN IEC 60381-1 , Measuring and/or control systems formed, for example, by means of programmable logic controllers (PLC).
  • PLC programmable logic controllers
  • Such an external interface can be designed, for example, as a two-wire connection that can be integrated into a current loop and/or be designed to be compatible with established industrial fieldbuses.
  • US-A 2016/0123783 shows, for example, a support device for the deformation body which is arranged on the transducer element side and is therefore not in contact with the fluid to be measured during operation, against which the deformation body presses at a static pressure above a predetermined limit value of, for example more than 40 bar is partially applied, such that mechanical stresses established therein can be kept below a specified maximum allowable stress even at higher pressures of up to 250 bar.
  • a disadvantage of this solution is that the sensitivity of the sensor is abruptly reduced when the above limit value is exceeded, so that the sensor has a pressure-dependent and non-linear sensitivity to the flow rate or volume flow.
  • one object of the invention is to improve sensors with a transducer element positioned on the deformation body in such a way that, even with a comparatively simple mechanical structure, they have a high compressive strength or can also be used in superheated steam applications with steam temperatures of over 200 °C and pressure peaks of over 100 bar enable the pressure resistance to be dependent on the operating temperature.
  • the sensor should be able to be assembled from individual components in a simple manner, for example also in order to be able to easily replace a defective converter element with a new, intact converter element.
  • the invention consists in a sensor, in particular a sensor for detecting pressure fluctuations in a Karman vortex street formed in a flowing fluid, which sensor comprises:
  • an at least partially flat, for example membrane-like or disc-shaped, deformation body for example made of a metal, with a flat first surface and an opposite flat second surface;
  • a sensor flag for example rod-shaped or plate-shaped or wedge-shaped, extending starting from the first surface of the deformation body
  • connection sleeve for example made of a metal, which extends from the deformation body and is electrically conductively connected thereto, for example;
  • a transducer element for example disk-shaped and/or piezoceramic, arranged within the connecting sleeve and contacting the second surface of the deformation body with a first contact surface, for example electrically conductive, for generating a time-changing, for example at least temporarily periodic, movement of the sensor vane and/or time-changing , for example at least temporarily periodic, deformations of the deformation body representing electrical sensor signal;
  • the fastening means comprise a spring assembly, for example cylindrical, formed by means of at least two plate springs layered on top of one another, and the plate springs are also elastically deformed while exerting a contact pressure force that keeps the transducer element pressed against the deformation body, for example in such a way that a minimum surface pressure acting on the transducer element is greater than 1 MPa and/or a maximum surface pressure acting on the converter element is less than 20 MPa and/or such that a non-positive connection is formed between the converter element and the deformation body.
  • a spring assembly for example cylindrical, formed by means of at least two plate springs layered on top of one another, and the plate springs are also elastically deformed while exerting a contact pressure force that keeps the transducer element pressed against the deformation body, for example in such a way that a minimum surface pressure acting on the transducer element is greater than 1 MPa and/or a maximum surface pressure acting on the converter element is less than 20 MPa and/or such that a non-positive connection is
  • the invention also consists in a measuring system for measuring at least one flow parameter, for example a flow parameter that changes over time, for example a Flow velocity and/or a volumetric flow rate, of a fluid flowing in a pipeline, which measuring system also has measuring electronics which are electrically connected to the converter element of the sensor and are set up to receive and process the sensor signal from the sensor, for example namely the at least one flow parameter to generate representative measured values.
  • the measuring system according to the invention can also be used, in particular, to measure a flow parameter - for example a flow velocity and/or a volume flow rate and/or a mass flow rate - of a temperature flowing in a pipeline, for example at least at times a temperature of more than 200° C. and/or at least at times with a Pressure of more than 100 bar acting on the deformation body and / or the sensor vane of the sensor, fluid, such as a vapor, can be used.
  • the fastening means comprise an (internal) screw sleeve having an external thread and the connecting sleeve has an internal thread in a distal end remote from the deformation body, and that the (internal) screw sleeve forms a Abutment for the spring assembly is screwed into the internal thread.
  • the fastening means comprise an (internal) circlip and the connecting sleeve has an (internal) groove in an area remote from the deformation body, and that the (internal) circlip forms an abutment for the spring assembly is inserted into the (inner) groove.
  • the deformation body and the sensor flag are connected to one another in a materially joined manner, for example by being welded or soldered to one another.
  • the transducer element and the deformation body are not connected to one another in a materially bonded manner.
  • the converter element and the spring assembly are not connected to one another in a materially bonded manner.
  • the fastening means comprise a ring-shaped insulating disk, for example made of a ceramic and/or a plastic, and that the insulating disk is positioned between the converter element and the spring assembly to form an insulating disk.
  • the cup springs are made of a metal, for example a high-grade steel or a nickel-based alloy.
  • the plate springs and the deformation body consist of the same material.
  • the deformation body consists at least partially, for example predominantly or completely, of a metal, for example a high-grade steel or a nickel-based alloy.
  • the sensor vane consists at least partially, for example predominantly or completely, of a metal, for example a high-grade steel or a nickel-based alloy.
  • the connecting sleeve consists at least partially, for example predominantly or completely, of a metal, for example stainless steel or a nickel-based alloy.
  • the deformation body and the sensor flag for example the connecting sleeve, deformation body and sensor flag, consist of the same material.
  • the deformation body and the sensor flag are components of one and the same monolithic molded part.
  • a minimum surface pressure acting on the converter element is more than 1 MPa, for example more than 3 MPa.
  • a maximum surface pressure acting on the converter element is less than 20 MPa, for example less than 15 MPa.
  • the transducer element electrically conductively contacts the deformation bodies and/or the connecting sleeve.
  • the senor also includes a metal foil, for example a silver foil.
  • the senor also includes a rod-shaped, plate-shaped or sleeve-shaped compensating body extending from the second surface of the deformation body to compensate for forces and/or moments resulting from joint movements of the deformation body and sensor vane.
  • the compensating body extends through the spring assembly, for example in such a way that a main axis of inertia (for example a longitudinal axis) of the compensating body and a main axis of inertia (for example a longitudinal axis) of the spring assembly are parallel to one another run, namely, for example, are coincident, and / or such that the spring assembly and compensating body do not contact each other.
  • the deformation body and the compensating body are connected to one another in a cohesive manner, for example by being welded or soldered to one another.
  • the sensor vane and compensating body are arranged in alignment with one another.
  • the compensating body and the deformation body are positioned and aligned with one another such that a main axis of inertia of the deformation body extends parallel to a main axis of inertia of the compensating body, for example coincident with it.
  • the deformation body and compensation body are components of one and the same monolithic molded part, for example in such a way that the sensor flag, deformation body and compensation body and/or that the connecting sleeve, deformation body and compensation body are components of the same molded part.
  • the compensating body consists at least partially, for example predominantly or completely, of a metal, for example stainless steel or a nickel-based alloy.
  • the deformation body and compensating body are made of the same material, for example in such a way that the sensor flag, deformation body and compensating body and/or that the connecting sleeve, deformation body and compensating body are made of the same material.
  • the measuring system also includes a tube that can be inserted into the course of the same pipeline and has a lumen that is designed to guide the fluid flowing in the pipeline.
  • the senor is inserted in the same tube in such a way that the first surface of the deformation body faces the lumen of the tube and that the sensor flag protrudes into the same lumen.
  • an opening is formed, especially a socket serving to hold the deformation body on the wall, and that the sensor is inserted in the same opening in such a way that the deformable body covers the opening, esp. Hermetically seals it, and that the first surface of the deformable body faces the lumen of the tube, so that the sensor flag protrudes into the same lumen.
  • the sensor flag has a length, measured as the minimum distance between a proximal end of the sensor flag, namely the end adjacent to the deformation body, and a distal end, namely the end remote from the deformation body or its surface Has sensor vane, which length corresponds to less than 95% of a caliber of the tube and / or more than half the same caliber.
  • the measuring system also has a bluff body in the lumen of the tube, for example upstream, namely in the (main) direction of flow in front of the sensor, which is set up to Karman vortex street, the sensor being set up to detect periodic pressure fluctuations in the Karman vortex street and to convert them into a sensor signal, for example in such a way that the sensor signal has a signal frequency that corresponds to a shedding rate of the vortices forming the Karman vortex street on the bluff body.
  • a basic idea of the invention is the desired high nominal compressive strength for sensors, not least also at high operating temperatures of over 200° ö, or the desired improvement in the dependence of the compressive strength of the sensor assembly on the operating temperature (pressure-temperature curve of the sensor assembly) thereby bring about by a arranged on the deformation body transducer element by means of a Disc springs formed spring assembly is held pressed against the deformation body.
  • An advantage of the invention is, inter alia, that not only can a significant improvement in the nominal compressive strength or the pressure-temperature curve of sensors of the type in question be achieved in a very simple manner, but that this is achieved without the Sensitivity, namely to significantly reduce the sensitivity of the sensor to the actual pressure fluctuations to be detected.
  • a further advantage of the invention can also be seen in the fact that defective components in the sensor according to the invention, for example the converter element or the fastening means, can be replaced very easily, for example also on site.
  • 1, 2 schematically in different views an embodiment of a measuring system--designed here as a vortex flowmeter--with a sensor and measuring electronics for measuring at least one flow parameter of a fluid flowing in a pipeline;
  • FIG. 3 is a schematic, sectional side view of an exemplary embodiment of a sensor that is particularly suitable for use in a measuring system according to FIGS. 1 and 2;
  • FIG. 1 and 2 show an embodiment of a measuring system for measuring at least one flow parameter, possibly also a flow parameter that changes over time, such as a flow velocity v and/or a volume flow V', of a fluid flowing in a pipeline, for example a hot, esp. gas which is at least temporarily at a temperature of more than 200°C and/or at least temporarily under a high pressure, in particular of more than 100 bar.
  • the pipeline can, for example, as a system component Formed heat supply network or a turbine circuit, thus the fluid can be, for example, steam, esp.
  • the fluid can also be (compressed) natural gas or biogas, for example, so the pipeline can also be a component of a natural gas or biogas plant or a gas supply network, for example.
  • the measuring system has a sensor 1--shown again enlarged in FIG to convert electrical or optical sensor signal s1.
  • the measuring system also includes measuring electronics 2, housed for example in a pressure- and/or impact-resistant protective housing 20, which is connected to sensor 1 or during operation of the measuring system communicates with sensor 1.
  • the measuring electronics 2 are set up in particular to receive and process the sensor signal s1, for example to generate measured values XM ZU representing at least one flow parameter, for example the flow velocity v or the volume flow rate V'.
  • the measured values XM can, for example, be visualized on site and/or transmitted--wired via the connected field bus and/or wirelessly by radio---to an electronic data processing system, such as a programmable logic controller (PLC) and/or a process control station.
  • PLC programmable logic controller
  • the protective housing 20 for the measuring electronics 2 can be made, for example, from a metal, such as stainless steel or aluminum, and/or by means of a casting process, such as an investment casting or a die casting process (HPDC); however, it can also be formed, for example, by means of a plastic molded part produced in an injection molding process.
  • the sensor 1 comprises a deformation body 111, especially a membrane-like or disc-shaped one, and a first side face on the left and a second side face on the right Sensor vane 112, which extends from a first surface 111+ of the deformation body 111 to a distal end, namely the (free) end remote from the deformation body 111 or its surface 111+.
  • the deformation body 111 also has a second surface 111# opposite the first surface 111+, for example at least partially parallel to the first surface 111+.
  • the deformation body 111 and the sensor flag 112 can, for example, be components of one and the same monolithic molded part, which is cast, for example, or produced by a generative method, such as 3D laser melting;
  • the deformation body and the sensor flag can also be designed as individual parts that are initially separate from one another or only subsequently connected to one another in a material-to-material manner, for example welded or soldered to one another, and consequently from materials that can be connected to one another in a material-to-material manner be manufactured.
  • the deformation body 111 can consist at least partially, for example predominantly or completely, of a metal such as stainless steel or a nickel-based alloy.
  • the sensor flag can also consist at least partially of a metal, for example a stainless steel or a nickel-based alloy;
  • the deformation body 111 and the sensor flag 112 can also be made from the same material.
  • the deformation body 111 and the sensor vane 112 are also set up in particular for - typically forced - to be excited to vibrate around a common static rest position, such that the sensor vane 112 elastically deforms the deformation body 111 pendulum movements in a - essentially transverse to the aforementioned flow direction running - detection direction performs.
  • the sensor vane 112 has a width, measured as a maximum extent in the direction of flow, which is significantly greater than a thickness of the sensor vane 112, measured as a maximum lateral extent in the direction of detection.
  • the sensor vane 112 can also, as is quite usual with such sensors, be designed, for example, in the shape of a wedge or also as a relatively thin, flat plate.
  • the sensor 1 also has a connecting sleeve 113, which extends from a peripheral edge segment, for example circular, of the second surface 111# of the deformation body.
  • the sensor also has at least one converter element 12, in particular disk-shaped and/or piezoceramic, arranged inside connecting sleeve 113 and contacting surface 111+ of the deformation body with a first contact surface, in order to generate a time-varying, in particular At least temporarily periodic movements of the sensor vane or an electrical sensor signal representing deformations of the deformation body 111 that change over time, especially at least temporarily periodic, deformations of the deformation body 111, for example with an electrical (AC) voltage corresponding to the aforementioned movements.
  • AC electrical
  • the senor 1 or the measuring system formed therewith is also intended in particular to be used in such measuring points where in the fluid to be measured, for example due to condensation-induced water hammer (CIWH), briefly extremely high hydrostatic, namely pressures of more than 100 bar acting perpendicularly against the wall 3* of the pipe, thus also acting against the sensor, can occur, for example in superheated steam applications with fluid temperatures of more than 200°C.
  • CIWH condensation-induced water hammer
  • fastening means 13 are positioned within the connecting sleeve 112 and are mechanically connected thereto, especially releasably.
  • the fastening means 13 comprise a spring assembly 131 (spring stack), for example cylindrical, formed by means of two or more disc springs stacked on top of one another, the disc springs (in the built-in state) are elastically deformed under the exertion of a contact pressure force that keeps the transducer element pressed against the deformation body, as a result of which a non-positive connection is formed between the transducer element and the deformation body; this in particular in such a way that a minimum surface pressure acting on the transducer element 12 is more than 1 MPa, especially more than 3 MPa, and/or a maximum surface pressure acting on the transducer element 12 is less than 20 MPa, especially less than 15 MPa , amounts to.
  • spring assembly 131 spring stack
  • the disc springs in the built-in state
  • the cup springs and the deformation body consist of the same material.
  • the cup springs can advantageously be made of a metal, for example a stainless steel or a nickel-based alloy such as X7 CrNiAl 17-7 (WsNr 1.4568, EN 10027-2:1992-09).
  • the connecting sleeve 113 and the converter element 12 can advantageously also be designed in such a way that an inner diameter of the connecting sleeve 113 in the area of the installed position of the converter element is essentially one thus corresponds to the corresponding outer diameter of the converter element, for example, namely only by a positioning converter element 12 on the deformation body 111 is just greater amount.
  • the connecting sleeve can also be designed in such a way that in an area above the converter element 12 (positioned in the installation position) it has a (smallest) inner diameter which is larger - for example by more than 1 mm. as a (largest) outer diameter of the transducer element.
  • the converter element 12 and the connecting sleeve 113 can also be shaped in such a way that the converter element 12 and the connecting sleeve 113 have mutually complementary outer and inner contours which nevertheless prevent an incorrect installation position of the converter element, for example in such a way that, as shown in Figs. 4a and 4b, viewed together, the converter element 12 has an outer contour with one or more straight sections 12a and that the connecting sleeve has an inner contour with the straight sections of the converter element 12 corresponding to the aforementioned straight sections.
  • the fastening means 13 comprise an (internal) circlip 132 and the connecting sleeve 113 has a corresponding annular or circumferential (internal) groove 113a in an area remote from the deformation body 111, the (internal) circlip forming a Abutment for the spring assembly is inserted into the (inner) groove.
  • the fastening means 13 can also have an externally threaded (internal) screw sleeve and the connection sleeve can have an internal thread in a distal end remote from the deformation body 111, such that the (internal) screw sleeve forms an abutment for the spring assembly 131 is screwed into the internal thread.
  • the spring assembly 131 and the converter element 12 can also be connected to one another non-materially, namely avoiding a material connection that binds the spring assembly and converter element to one another, so the use of adhesives can also be dispensed with here accordingly.
  • spring pack 131 also easily enables a connection between converter element 12 and deformation body 111 to be brought about with good electrical conductivity between converter element 12 and deformation body 111 and/or to bring about mechanical contact between converter element 12 and deformation body 111 that is as uniform as possible Metal foil, for example namely a silver foil to position.
  • fastening means 13 between converter element 12 and spring assembly 131, for example electrically and/or thermally insulating insulating disks and/or a contact disk for electrically connecting an electrical connecting line leading to the converter element, for example in such a way that the contact disks make electrically conductive contact with a second contact surface of the converter element that is opposite the aforementioned first contact surface of the converter element.
  • the fastening means accordingly comprise an insulating disk, for example an annular one, in particular made of ceramic and/or plastic, which is positioned between the converter element 12 and the spring assembly 131, and/or the fastening means comprise a contact disk 133 with an electrically conductively connected electrical connection line 14.
  • the measuring system also comprises a tube 3 which can be inserted in the course of the aforementioned pipeline and has a lumen 3' which is encased by a - for example metallic - wall 3* of the tube and which extends from an inlet end 3+ to an outlet end 3#. extends and which is adapted to guide the fluid flowing in the pipeline.
  • the sensor 1 is also inserted in the same tube in such a way that the first surface of the deformation body 111 faces the lumen 3' of the tube, and the sensor flag therefore projects into the same lumen.
  • a flange connection is provided at the inlet end 3+ and at the outlet end 3# to produce a leak-free flange connection with a corresponding flange on an inlet or outlet line segment of the pipeline.
  • the tube 3, as shown in FIG. 1 or 2 can be designed essentially straight, for example as a hollow cylinder with a circular cross-section, such that the tube 3 has an imaginary straight longitudinal axis connecting the inlet end 3+ and the outlet end 3# L In the exemplary embodiment shown in Fig.
  • the sensor 1 is inserted from the outside through an opening 3" formed in the wall into the lumen of the tube and for example also detachable again - fixed from the outside to the wall 3* in such a way that the surface 111+ of the deformation body 111 faces the lumen 3' of the tube 3, and consequently the sensor flag 112 protrudes into the same lumen.
  • the sensor 1 is inserted into the opening 3" in such a way that the deformation body 111 covers or hermetically closes the opening 3".
  • This opening can, for example, be designed in such a way that--as is quite usual in measuring systems of the type under discussion--it has an (internal) diameter which lies in a range between 10 mm and approx. 50 mm.
  • a socket 3a serving to hold the deformation body 111 or the sensor 1 formed with it on the wall 3* is formed in the opening 3′′.
  • the sensor 1 can be fixed to the tube 3, for example, by cohesively connecting, in particular by welding or soldering, the deformation body 111 and the wall 3*; it can, for example, also be detachably connected to the tube 3, for example screwed or screwed on.
  • at least one sealing surface for example also a circumferential or circular ring-like sealing surface, can be formed in the socket 3a, which is set up to seal the opening 3" accordingly in interaction with the deformation body 111 and a sealing element that may be provided, for example ring-shaped or annular disk-shaped.
  • the sensor 1 and the tube 3 are dimensioned in such a way that a length of the sensor flag 112, measured as the minimum distance between a proximal end of the sensor flag 112, namely one that borders on the deformation body 111, to the distal end of the sensor flag 112 is longer corresponds to a half of a caliber DN of the tube 3 or less than 95% of the same caliber DN.
  • the length of the sensor vane 112 can, for example--as is quite usual with a comparatively small caliber of less than 50 mm--also be chosen such that the same distal end of the sensor vane 112 has only a very small minimum distance from the wall 3* of the tube 3.
  • the sensor vane 112 - as is quite usual in measuring systems of the type in question and as can also be seen from FIG Rohrs 3.
  • the measuring system is specifically designed as a vortex flowmeter with a lumen of the tube 3--in this case upstream of the sensor 1, specifically in front of the sensor seen in the (main) flow direction--arranged to effect Dam body 4 serving as a Karman vortex street in the flowing fluid is formed.
  • the sensor and bluff body are in particular dimensioned and arranged in such a way that the sensor flag 112 protrudes into the lumen 3* of the tube or the fluid conducted therein in an area which is regularly occupied by a (steady-state) Karman vortex street during operation of the measuring system so that the pressure fluctuations detected by the sensor 1 are periodic pressure fluctuations caused by vortices shed at the bluff body 4 at a shedding rate ( ⁇ 1/fvtx) and the sensor signal s1 is one with the shedding rate that vortex has the corresponding signal frequency ( ⁇ fvtx).
  • the vortex flowmeter is also designed as a compact measuring system in which the measuring electronics 2 are housed in a protective housing 20 held on the pipe, for example by means of a neck-shaped connecting piece 30 .
  • the sensor 1 also has a compensating body 114 which extends from the second surface 111# of the deformation body 111 and is, for example, in the form of a rod, plate or sleeve.
  • the compensating body 114 can, for example, consist of the same material as the deformation body and/or the sensor flag, for example a metal.
  • the compensating body 114 can be made of stainless steel or a nickel-based alloy.
  • the deformation body 111 and the compensation body 114 are integrally connected to one another, for example welded or soldered to one another.
  • deformation body 111 and compensating body 114 can also be components of one and the same monolithic molded part, for example such that sensor flag 111, deformation body 112 and compensating body 114 are components of the same molded part.
  • Compensating bodies 114 can also be arranged in alignment with one another--as can be seen from a combined view of FIGS.
  • the compensating body 114 and the deformation body 111 can also be positioned and aligned with one another such that a main axis of inertia of the deformation body 111 coincides with a main axis of inertia of the compensating body 114 in an extension.
  • the compensating body and the spring assembly are designed and arranged in such a way that the compensating body extends through the spring assembly, for example also in such a way that a main axis of inertia, for example a longitudinal axis, of the compensating body and a main axis of inertia, for example a longitudinal axis , of the spring assembly run parallel to one another, especially coincidentally, and/or in such a way that the spring assembly and compensating body do not contact one another.

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  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Fluid Pressure (AREA)

Abstract

Capteur comprenant un corps de déformation (111) plat au moins par endroits ayant une surface (111+) plane et une surface (111#) plane située à l'opposé, une languette de détection (112) s'étendant à partir de la première surface (111+) du corps de déformation, une cosse de raccord (113) s'étendant à partir du corps de déformation, un élément transducteur (12) monté à l'intérieur de la cosse de raccord (113) et établissant le contact entre la surface (111+) du corps de déformation et une surface de contact, ledit élément transducteur étant destiné à générer un signal de capteur électrique représentant des mouvements variables dans le temps de la languette de détection et/ou des déformations variables dans le temps du corps de déformation, ainsi que des moyens de fixation positionnés à l'intérieur de la cosse de raccord (113) et liés mécaniquement à celle-ci, lesquels sont destinés à fixer l'élément transducteur (12) dans la cosse de raccord (113). Les moyens de fixation (13) du capteur selon l'invention comprennent un bloc-ressort (131) composé d'au moins deux rondelles ressort empilées l'une sur l'autre, les rondelles ressort étant déformées sous l'effet d'une force d'application qui maintient l'élément transducteur plaqué contre le corps de déformation.
EP21840843.3A 2020-12-18 2021-12-17 Capteur pour détecter des variations de pression dans un fluide en écoulement et système de mesure formé dudit capteur Pending EP4264194A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102020134264.0A DE102020134264A1 (de) 2020-12-18 2020-12-18 Sensor zum Erfassen von Druckschwankungen in einem strömenden Fluid sowie damit gebildetes Meßsystem
PCT/EP2021/086361 WO2022129447A1 (fr) 2020-12-18 2021-12-17 Capteur pour détecter des variations de pression dans un fluide en écoulement et système de mesure formé dudit capteur

Publications (1)

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EP4264194A1 true EP4264194A1 (fr) 2023-10-25

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Country Status (5)

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US (1) US12498259B2 (fr)
EP (1) EP4264194A1 (fr)
CN (1) CN116615635A (fr)
DE (1) DE102020134264A1 (fr)
WO (1) WO2022129447A1 (fr)

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DE102022105199A1 (de) 2022-03-04 2023-09-07 Endress+Hauser Flowtec Ag Sensor sowie damit gebildetes Meßsystem

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Also Published As

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DE102020134264A1 (de) 2022-06-23
US12498259B2 (en) 2025-12-16
US20240295422A1 (en) 2024-09-05
CN116615635A (zh) 2023-08-18
WO2022129447A1 (fr) 2022-06-23

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