• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
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  • 优先权
    • 专利摘要:
    Fluid measuring means (10) having a fluid housing (12), and method of manufacturing the fluid housing (12) which includes a fluid inlet (14), a fluid outlet (16) and a fluid channel (24) which extends between the fluid inlet (14) and the fluid outlet (16) and which is fluidly coupled to the fluid inlet (14) and to the fluid outlet (16), the fluid housing (12) having one side facing the fluid channel (24), with which is associated a fluid measurement module (26) which is in direct contact with a fluid flowing through the fluid channel ( 24) at a separation surface (35) on the fluid side, the fluid measurement module (26) being surrounded by the fluid housing (12), and the fluid measurement module (26) being arranged so as to generate acoustic surface waves (O) which propagate along the separation surface (35) on the fluid side of the fluid measurement module (26).
    公开号:FR3086388A1
    申请号:FR1858705
    申请日:2018-09-25
    公开日:2020-03-27
    发明作者:Yannick Fuchs；Yves Hoog
    申请人:Buerkert Werke GmbH and Co KG；Burkert S A S；
    IPC主号:
    专利说明:

    Fluid measurement means having a fluid housing, and method of manufacturing a fluid housing
    The invention relates to a means for measuring fluid having a fluid housing, and to a method of manufacturing a fluid housing.
    Fluid measurement means are known in the state of the art, which are used in installations for determining the flow rate of a fluid through a fluid measurement channel. In general, the medium used to measure the fluid should be as compact and as robust as possible, thus requiring little mounting space and largely no maintenance. It is also advantageous to be able to use the fluid measuring means as universally as possible and, in particular, to be able to use different fluids or also to be able to determine different properties of the fluids.
    The fluid measuring means can also operate with ultrasonic measuring devices, the fluid measuring means usually having for this purpose parts embedded in the fluid measuring channel. The embedded parts however alter the flow of the fluid through the fluid measurement channel and generate pressure drops, thus disturbing the measurement of the fluid flow rate. In addition, it is difficult to clean the fluid measuring channel due to the inserts, and to clean the inserts themselves.
    The state of the art also discloses fluid measurement means which use surface acoustic waves (SAW) to determine the flow of the fluid through the fluid measurement channel. The surface acoustic waves are therefore excited in an acoustic waveguide, in particular by means of an acoustic signal transducer, then partly decoupled from the fluid flowing through the fluid channel and then again coupled in the waveguide. The frequency of the surface acoustic waves is appropriately chosen for this purpose so that part of the surface waves is decoupled from the waveguide and propagates
    At least by sections in the fluid in the form of a volume wave. The interference between the surface acoustic wave and the recoupled volume wave gives a characteristic signal which is evaluated to determine the properties of the fluid. The variation over time and the intensity of the characteristic signal, in particular the variation of the intensity over time, including the time delay, make it possible for example to draw conclusions on the characteristic properties of the fluid, such as the speed sound, temperature, homogeneity, flow speed, flow rate, concentration or viscosity. Such fluid measurement means based on surface acoustic waves are however very complex to manufacture and therefore expensive. This is due in particular to the fact that the acoustic signal transducer must be isolated from the fluid measurement channel, since it must be placed as close as possible to the fluid to couple the volume wave.
    The object of the invention is to provide an inexpensive and easy-to-manufacture means of measuring fluid, by means of which characteristic properties of the fluid can be determined on the basis of surface acoustic waves.
    To achieve this objective, there is provided according to the invention a fluid measurement means having a fluid housing which comprises a fluid inlet, a fluid outlet and a fluid channel which extends between the fluid inlet and the fluid outlet and which is fluidly coupled to the fluid inlet and the fluid outlet, the fluid housing having one side facing the fluid channel, with which is associated a fluid measurement module which is in direct contact with a fluid flowing through the fluid channel at a fluid side separation surface, the fluid measurement module being surrounded by the fluid housing, the fluid measurement module being arranged so as to generate acoustic surface waves which propagate along the fluid side separation surface of the fluid measurement module.
    According to the invention, there is also provided a method for manufacturing a fluid measurement means, comprising the following steps:
    - the installation of a fluid measurement module in an injection molding mold, and
    -3- the coating of the fluid measurement module by injection to produce a fluid housing of the fluid measurement means having a fluid channel, so that the fluid measurement module is surrounded by the fluid housing.
    The invention is based on the basic idea that it is possible to provide a means of measuring fluid on the basis of surface acoustic waves which is inexpensive and which is produced in a compact and robust manner, since the fluid measurement module is surrounded by the fluid housing, therefore integrated or embedded in the fluid housing. This is ensured in a simple manner by the manufacture of the means for measuring fluid in an injection molding mold, by coating the module for measuring fluid inserted in the injection molding mold so as to form the fluid housing presenting the channel. fluid, which then surrounds the fluid measurement module (by cooperation of materials). This ensures permanent sealing of the fluid measurement module inside the fluid housing. Thanks to the placement of the fluid measurement module directly in the injection molding mold and the coating of the injection fluid measurement module for the realization of the fluid housing, the fluid measurement means is consequently inexpensive to manufacture, since complex sealing of the fluid measurement module is no longer necessary.
    In other words, the fluid measurement module can be an insertion of the fluid measurement module. This is due to the fact that during the manufacture of the fluid measurement means, the fluid measurement module was first placed in the injection mold, then was coated by injection so that the module fluid measurement device is surrounded by the fluid housing thus produced (fluid-tight), that is to say embedded or housed integrally.
    The fluid side separation surface can be formed by one side of the fluid measurement module which faces the fluid channel. In other words, the fluid measurement module is in direct contact with the fluid that flows through the fluid channel from this side.
    In principle, the fluid measurement module which is in direct contact with a fluid which flows through the fluid channel at a fluid side separation surface and which is arranged so as to generate surface acoustic waves , is a module called SAW. The properties of the fluid can be easily measured by means of the fluid measurement module produced under
    - 4 forms of SAW module, since the surface waves propagate on the one hand as surface waves along the separation surface on the fluid side of the fluid measurement module, and on the other hand in the form volume waves through the fluid, as is common with a SAW module. Surface waves along the separation surface and the recoupled volume wave generate a characteristic interference signal which can be evaluated to determine corresponding properties of the fluid.
    According to the invention, it can be provided that the fluid measurement module has at least one acoustic signal transducer which is arranged so as to emit and / or measure the surface wave and a volume wave. Part of the energy of the surface wave is decoupled, and a volume wave is produced, which propagates at least partially through the fluid to be measured. The surface wave and the volume wave excited by it in the fluid are thus generated by the acoustic signal transducer. The acoustic signal transducer allows inexpensive generation and measurement of surface waves and volume waves (recoupled).
    The volume wave has in particular at least one reflection point on an inner wall of the fluid channel, so that the volume wave crosses the fluid at least twice, therefore several times. This makes it possible to lengthen the distance of propagation of the volume wave in the fluid in a corresponding manner. The interference from the surface wave and the volume wave, and therefore the interference signal, can be measured by the acoustic signal transducer. The interference or the interference signal may further be evaluated to determine characteristic properties of the fluid.
    An evaluation unit or electronics may be provided for the evaluation of the interference or the interference signal. The evaluation unit or the electronics may also be provided to excite surface acoustic waves. The evaluation unit or the electronics is housed in an electronics box which is in particular produced separately. The evaluation unit or the electronics is further coupled to said at least one acoustic signal transducer to initiate the excitation of surface acoustic waves via the acoustic signal transducer or to receive the received interference signal. of the acoustic signal transducer, in order to be able to evaluate it.
    -5Electrical interface can also be provided on the electronics box through which it is possible to electrically contact the fluid measurement means. The electrical interface is in particular electrically coupled to the evaluation unit or to the electronics. By means of the electrical interface, it is possible to take the data or signals supplied by the evaluation unit or the electronics appropriately or to receive external control signals.
    The electronic housing can be produced during the manufacture of the fluid housing, the electronic housing and the fluid housing being in particular produced simultaneously. In other words, the electronics housing and the fluid housing can be made in one piece with each other or by cooperation of materials.
    According to one embodiment of the invention, provision is made for the fluid measurement module to have a cavity in which the acoustic signal transducer is arranged. The cavity allows targeted coupling of the surface wave and avoids unnecessary signal losses. The cavity is in particular adjacent to the fluid side separation surface so that it decouples the corresponding associated side of the fluid measurement module from other sides or other walls of the fluid measurement module in terms of vibrations.
    A vacuum / depression may be present in the cavity. The cavity can also be filled with a gas or a mixture of gases, for example air, to provide the desired properties.
    The fluid measurement module can be made in several pieces, in particular in two pieces, so that a cavity is formed during the production of the fluid measurement module. The fluid measurement module includes for example a base body (pot-shaped) and a cover, which form the cavity in the assembled or prefabricated state.
    It is possible to provide that the fluid measurement module, in particular the base body, has a reduced wall thickness in the area of the acoustic signal transducer. In particular, the wall thickness is 40 to 60%, preferably 50%, of the wavelength of the surface acoustic wave. With this wall thickness of the measurement module
    - 6 fluid, the surface waves are particularly well coupled by the acoustic signal transducer. The reduced wall thickness relates to the side or wall of the fluid measurement module associated with the separation surface on the fluid side, therefore the wall of the fluid measurement module which forms the separation surface on the fluid side.
    According to one embodiment of the invention, provision may be made for the fluid measurement module to have a metallic base body. The propagation of the surface wave in the metallic base body has particularly low losses, which makes it possible to use long measurement or propagation distances to measure the properties of the fluid, which increases the accuracy of the measurement. The volume waves in the fluid can also be easily excited by means of the metallic base body.
    The metal body comprises in particular the fluid side separation surface of the fluid measurement module. Consequently, the fluid measurement module is in contact with the fluid which flows through the fluid channel via the metal base body.
    Said at least one acoustic signal transducer is in particular arranged on the metal base body, that is to say on the side of the metal base body which is opposite the separation surface on the fluid side.
    It can be provided that the fluid housing is made of a plastic material and in particular an injection molded part. Plastic parts are particularly inexpensive to manufacture, so the fluid housing can be inexpensively manufactured. It is also possible to produce complex geometries in a simple and economical manner in an injection molding process.
    In a preferred embodiment, it is possible to provide that the fluid measurement module is housed in a fluid-tight manner in the fluid housing and in particular coated by injection. Since the fluid measurement module is housed in a fluid-tight manner, the acoustic signal transducer is protected against damage caused by fluid infiltration. As already explained, the fluid-tight housing of the fluid measurement module is easily achieved by coating the fluid measurement module by injection of the
    -7 plastic material forming the fluid housing, so that the fluid measurement module is embedded in the fluid housing.
    Since the fluid measurement module is in direct contact with the fluid flowing through the fluid channel, a fluid tight housing is important.
    It may further be provided that a reflective insert and / or an additional fluid measurement module is / are provided (s) on the side of the fluid channel opposite the fluid measurement module, the reflective insert and / or the additional fluid measurement module being in particular also surrounded by the fluid housing. The reflective insert reflects the volume wave so that the reflective insert prevents at least partial coupling of the volume wave generated in the fluid housing, which would therefore make the measurement inaccurate. In other words, the reflective insert provides said at least one reflection point for the volume wave. The reflective insert makes it possible to extend the propagation distance of the volume wave, thanks to which it is possible to determine the characteristic properties of the fluid with higher precision. The reflective insert can be made of a metallic material, in particular with a relatively large wall thickness in order to obtain the desired reflection properties.
    The additional fluid measurement module can be made in the form of a receiver and / or transmitter, the additional fluid measurement module cooperating with the fluid measurement module. The characteristic properties of the fluid can also be determined more precisely, since a redundant measurement is possible, in particular from opposite sides of the fluid channel.
    The reflective insert and / or the additional fluid measurement module is / are also surrounded by the fluid housing and in particular embedded (s) in the fluid housing (in a fluid-tight manner). The reflective insert and / or the additional fluid measurement module is / are first installed in the injection molding mold during the manufacture of the fluid measurement means, then coated with the plastic material which forms the fluid housing. On this point, the reflective insert and / or the additional fluid measurement module is / are also integrated in the fluid housing.
    -8II it can be provided that the fluid measurement module forms together with the opposite reflective insert and / or the additional fluid measurement module a channel-shaped insertion unit, the fluid measurement module being in particular connected to the reflective insert and / or to the additional fluid measurement module by two side walls. The channel-shaped insertion unit is therefore made in one piece. The channel-shaped insertion unit is for example placed in the injection molding mold and is then coated by injection of the plastic material which forms the fluid housing. This allows simple and inexpensive manufacture of the fluid measurement means.
    If there is no channel-shaped insertion unit, the fluid measurement module and the reflective insert or additional fluid measurement module can be placed individually in the mold. injection at the places provided and are then simultaneously surrounded by the plastic material forming the fluid housing, therefore coated by injection.
    It may further be provided that the cross section of the fluid channel is angular and / or that the fluid inlet and / or the fluid outlet each have a circular cross section, the fluid channel being in particular formed by a integral with the fluid inlet and / or the fluid outlet. The circular cross section of the fluid inlet and / or the fluid outlet allows simple connection to the external pipes. To this end, provision may be made to associate corresponding fittings or connection geometries with the fluid inlet and / or the fluid outlet, for example that the fluid inlet and / or the fluid outlet have each a thread. The connections or the connection geometries can be formed directly on the fluid inlet and / or the fluid outlet. The angular, in particular rectangular, cross section of the fluid channel allows the reflection of the volume wave preferably between the fluid measurement module and the opposite wall on the fluid side. The angular cross section, in particular rectangular, thus allows precise measurement.
    The fluid housing in particular comprises the fluid channel and the fluid inlet and / or the fluid outlet, so that these components are produced integrally with one another and can therefore be manufactured from way can be expensive. A constant change in the cross section of the fluid housing is in particular obtained in transition zones between the fluid inlet and the channel
    Fluid, or the fluid outlet and the fluid channel. This results in low pressure drops which would adversely affect the measurement.
    Transition zones can be easily produced during the injection molding process.
    In another embodiment, it can be provided that the fluid housing includes a measurement channel section which extends along a recess of the fluid housing in which the fluid measurement module is arranged. The fluid measurement module therefore does not produce embedded elements or edges in the fluid channel which could impede the flow of the fluid. The recess is in particular produced during the manufacture of the fluid housing, since the fluid measurement module has been previously placed in the injection molding mold, so that the fluid housing is produced around the fluid measurement module during injection molding.
    According to one embodiment, a damping element is provided at least at one end of the fluid measurement module. The damping element prevents unwanted coupling of the surface acoustic wave into other components of the fluid measuring means. In addition, the damping element reduces or prevents unwanted reflections, for example unwanted reflections on the fluid housing.
    According to one embodiment, provision is made for the use of a plastic material for the coating of the fluid measurement module by injection and the manufacture of the fluid housing. Plastics are easy-to-handle, inexpensive materials, which is why they are used in injection molding. The use of plastic thus allows the manufacture of an inexpensive fluid housing.
    According to the invention, provision is made in particular for producing the fluid measurement means described above by means of the injection molding method described.
    Other characteristics and advantages of the invention result from the following description of the preferred embodiments and from the drawings to which reference is made. The drawings show:
    -10Figure 1 a first embodiment of a fluid measurement means according to the invention in a perspective view,
    2 is a view in longitudinal section of the fluid measurement means of FIG. 1,
    FIG. 3 a cross-sectional view of the means for measuring the fluid of FIG. 1,
    FIG. 4 is a view in longitudinal section of a part of a channel-shaped insertion unit which can be used in a means for measuring fluid according to the invention, and
    Figure 5 a cross-sectional view of a fluid measuring means according to the invention in a second embodiment.
    In all the figures, the direction of flow is indicated in an exemplary manner by arrows. It is however also conceivable that the direction of flow is directed in the other direction.
    Figure 1 shows a means for measuring fluid 10 according to a first embodiment from the outside, having a fluid housing 12, a fluid inlet 14 and a fluid outlet 16. The fluid housing 12 is made in a plastic and is surrounded by an electronic box 18, also made of a plastic. The fluid housing 12 and the electronics housing 18 can in particular be made in one piece and / or by cooperation of materials with each other, namely in a manufacturing step.
    The electronics housing 18 has on the outside at least one electrical interface 20, for example in order to be able to contact electronics 22 of the fluid measurement means 10 inside the electronics housing 18, as is shown, inter alia, from the FIG. 2. The electronics 22 inside the electronics box 18 can for example be controlled via the electrical interface 20. The electronics 22 is for this purpose connected to the electrical interfaces 20.
    In the embodiment shown, two electrical interfaces 20 are provided on the electronic box 18, as can be seen in FIG. 1.
    It is also conceivable that the electrical interface 20 is produced by wireless technology, that is to say a wireless communication interface.
    The fluid housing 12 includes a fluid channel 24 through which a fluid can flow and whose characteristic property is to be measured by the fluid measuring means 10, as explained below.
    The fluid channel 24 is fluidly coupled to both the fluid inlet 14 and the fluid outlet 16. In other words, the fluid inlet 14 represents the start of the fluid channel 24, and the outlet of fluid 16 the end of the fluid channel 24.
    The fluid measurement means 10 also includes a fluid measurement module 26 with the aid of which it is possible to measure the characteristic property of the fluid, as explained below.
    The fluid measurement module 26 comprises a base body 28, in particular metallic, at least one acoustic signal transducer 30, a cavity 32 and a cover 34. The cavity 32 is formed between the base body 28 and the cover 34 , said at least one acoustic signal transducer 30 being arranged in the cavity 32. A vacuum / depression may be present in the cavity 32. The cavity 32 can also be filled with a gas or a mixture of gas, for example air.
    In the embodiment shown, the fluid measurement module 26 comprises two signal transducers 30 arranged in the cavity 32.
    The base body 28 is in direct contact with the fluid flowing through the fluid channel 24 through one side of a wall associated with the fluid channel 24, so that the side of the wall forms a separation surface 35 fluid side of the fluid measurement module 26, in particular of the base body 28. The fluid measurement module 26 is directly adjacent to the fluid flowing through the fluid channel 24 via the separation surface 35 on the fluid side.
    Said at least one acoustic signal transducer 30 is arranged on the side of the wall of the base body 28 opposite the separation surface 35 on the fluid side, so that it cooperates with the wall of the base body 28 which forms the surface of separation 35 on the fluid side.
    The fluid measurement module 26 is arranged so as to generate surface acoustic waves O which propagate along the separation surface 35 on the fluid side of the fluid measurement module 26, as explained below. Consequently, the fluid measurement module 26 can also be called the SAW module.
    The fluid measurement module 26 is in particular a prefabricated unit.
    FIG. 1 further shows that the fluid measurement module 26 is arranged in a recess 36 in the fluid channel 24, so that the separation surface 35 on the fluid side of the fluid measurement module 26 is aligned with the zones of the channel of fluid 24 between the fluid measurement module 26 and the fluid inlet 14 or the fluid outlet 16, that is to say that the flow section of the fluid channel 24 does not change. It is in particular provided that the fluid measurement module 26 does not cause embedded parts capable of influencing the flow of the fluid in the fluid channel 24.
    The section of the fluid channel 24 with which the fluid measurement module 26 is associated is also called the section of the fluid channel 37, since the measurement of the fluid in the fluid channel 24 is carried out in this section, as explained above. below. The recess 36 thus extends over the length of the measurement channel section 37.
    The fluid channel 24 thus comprises a section of measurement channel 37 and two zones adjacent to the fluid inlet 14 and to the fluid outlet 16, respectively, which extend from opposite ends of the section of the fluid channel. measure 37.
    In the embodiment shown, the fluid measurement means 10 further comprises a reflective insert 38 which is arranged on the side of the fluid channel 24 opposite the fluid measurement module 26, as can be seen in FIG. 2.
    The reflector insert 38 serves to reflect the signals coming from the acoustic signal transducer 30, as explained below during the description of the operation of the fluid measurement means 10.
    To improve the reflectivity, the reflector 38 is for example made of a metal.
    FIG. 3 shows that the reflective insert 38 is connected in one piece to the base body 28 of the fluid measurement module 26 by side walls 39 and forms an insertion unit 40 in the form of a channel.
    The channel-shaped insertion unit 40 has an angular cross section, in particular rectangular.
    The fluid inlet 14 and the fluid outlet 16, on the other hand, have a circular cross section to allow easy connection of the fluid measurement means 10 to external pipes (most often circular), in particular by means of threads. such as threads.
    Between the circular cross sections of the fluid inlet 14 and the fluid outlet 16, respectively, and the angular cross section of the channel-shaped insertion unit 40, there is respectively provided a nozzle 42 and a diffuser 44, which can each also be called transition section, since they cause a corresponding change in the cross section of the fluid channel 24.
    In general, the transition sections, that is to say the nozzle 42 and the diffuser 44, ensure that the different cross sections merge continuously, that is to say that the circular cross sections of the fluid inlet 14 and the fluid outlet 16 merge into the angular cross section of the fluid channel 24. This makes it possible to avoid turbulence and pressure losses associated therewith, which could influence the result of the measurement. The nozzle 42 and the diffuser 44 are preferably opposite one another, but for the rest of the same design.
    FIGS. 2 and 3 also show that the fluid housing 12 surrounds the insertion unit 40 in the form of a channel and therefore also the fluid measurement module 26. In other words, the fluid measurement module 26 or the channel-shaped insertion unit 40 is sealed in a fluid-tight manner by the fluid housing
    12.
    To this end, it is planned to manufacture the fluid housing 12 by the injection coating of the fluid measurement module 26, in particular of the channel-shaped insertion unit 40 comprising the fluid measurement module 26 , so that at least the fluid measurement module 26 is embedded or integrated in the housing
    -14fluid 12 fluid-tight. It is thus ensured that the fluid can only spread in the fluid channel 24 and does not penetrate into the fluid measurement module 26 or into the intermediate spaces.
    For the manufacture of the fluid measurement means 10, the fluid measurement module 26 or the channel-shaped insertion unit 40 comprising the fluid measurement module 26 is first placed in a injection molding mold, the fluid measuring module 26 or the insertion unit 40 then being coated with the plastic material forming the fluid housing 12, so that the fluid measuring module 26 or l the insertion unit 40 is received or integrated in a fluid-tight manner in the fluid housing 12.
    In other words, the fluid measurement module 26 or the insertion unit 40 is coated by injection by the fluid housing 12.
    The fluid measurement module 26 or the insertion unit 40 is then surrounded in a fluid-tight manner by the fluid housing 12 or is integrated therein.
    The operation of the fluid measurement means 10 is explained below with reference to Figure 4, in which the fluid measurement module 26 is shown in detail, in particular as part of the insertion unit 40 shaped like a channel.
    In principle, the base body 28 of the fluid measurement module 26 comprises two zones, namely a coupling and / or decoupling zone 46 and a propagation zone 48, which are produced by a first wall thickness T1 characteristic for the coupling and / or decoupling zone 46 and a second wall thickness T2 characteristic for the propagation zone 48.
    The coupling and / or decoupling zone 46 and the propagation zone 48 are connected to one another by transition zones in the form of ramps 50 or are joined by transition zones in the form of ramps 50, being given that they are produced during injection molding of the fluid housing 12.
    In order to measure the characteristic properties of the fluid inside the fluid channel 24, said at least one acoustic signal transducer 30 excites surface acoustic waves O in the region of the coupling and / or decoupling zone 46, in particular directly below the acoustic signal transducer 30.
    As already explained, two acoustic signal transducers 30 are provided in the embodiment shown. An acoustic signal transducer 30 serves for example as a transmitter and another signal transducer 30 as a receiver.
    However, it is also conceivable that a single acoustic signal transducer 30 is present and that it is simultaneously produced in the form of a transmitter and a receiver, the emitted surface acoustic waves O being correspondingly reflected towards the single signal transducer acoustic 30.
    The surface acoustic waves O propagate along the separation surface 35 on the fluid side of the base body 28. Due to the direct fluid separation surface 35 of the base body 28 of the fluid measurement module 26 relative to the fluid, part of the energy of the surface acoustic waves O is decoupled in the fluid and extends from there at a specific angle of propagation Θ (relative to a normal to the surface of the base body 28) under volume waveform V through the fluid in the fluid channel 24, as shown in Figure 4 schematically.
    If the fluid does not move in the fluid channel 24, the angle of propagation Θ of the volume wave V in the fluid results from the ratio between the speed of sound in the fluid and the speed of sound of the wave of surface c w in the base body 28 so as to obtain
    Θ = arcsin (Cf / c w ).
    The angle Θ therefore results from “the pairing of materials”, the speed of sound Cw in the base body 28 having to be different from the speed of sound Cf in the fluid to obtain a value different from zero, below which the surface wave O is coupled in the fluid and travels a spatial distance in the fluid in the form of a wave of volume V.
    Surface acoustic waves include LAMB waves, Rayleigh waves or Leaky-Rayleigh waves, among others, which can be used here, among others.
    -16On the opposite side of the fluid channel 24, the volume wave V is incident on the reflective insert 38 at a first reflection point 52 and is again reflected there towards the base body 28. There, the wave of volume V is incident on the propagation zone 48 having the second wall thickness T2 which ensures good reflection of the wave of volume V, so that the wave of volume V is again reflected towards the insert reflector 38, etc.
    Thus, the volume wave V propagates in the fluid over a long corresponding propagation distance, which improves the measurement correspondingly.
    As soon as the volume wave V at the base body 28 is again incident on the coupling and / or decoupling zone 46, the volume wave V is again decoupled, that is to say converted in a surface acoustic wave O which is received by at least one acoustic signal transducer 30.
    Said at least one acoustic signal transducer 30 also receives the surface acoustic wave O in order to determine an interference or an interference signal, in particular a delay in the propagation time of the original surface acoustic wave O and of the recoupled surface acoustic wave O.
    The delay in the propagation time between the surface acoustic wave O and the surface acoustic wave O emitted by the acoustic signal transducer 30 makes it possible to draw conclusions about characteristic properties of the fluid, such as its concentration, its viscosity, its speed of sound, its speed of flow, its flow, its temperature and / or its homogeneity.
    For proper operation of the energy transfer in the fluid, the wall thickness of the coupling and / or decoupling zone 46 is within a defined size range, which depends on the wavelength λ of the surface acoustic wave O.
    For this purpose, the wall of the base body 28 which forms the separation surface 35 on the fluid side has the first wall thickness T1 in the region of the coupling and / or decoupling zone 46, which is less than or equal to the wavelength A of the surface acoustic wave O, here preferably 50% of the wavelength A of the surface acoustic wave O. The first wall thickness T1 in the coupling zone and / or decoupling 46 ensures that the generation
    Acoustic waves of surface O and the reconversion of waves of volume V into acoustic waves of surface O at the level of the acoustic signal transducer 30 are particularly effective.
    The wall area of the base body 28 having the first wall thickness T1 extends not only directly below the acoustic signal transducer 30, but also in an area between the acoustic signal transducer 30 and the propagation area 48 .
    This region of the coupling and / or decoupling zone 46 extends over a length L which can correspond to 5 to 10 wavelengths λ of the surface acoustic wave O. In the zone of the acoustic signal transducer 30 , this allows good coupling of the surface acoustic wave O first in the base body 28 and then in the fluid in the form of a volume wave V.
    Conversely, an area having the first wall thickness T1 upstream of the acoustic signal transducer 30 facilitates the conversion of the volume wave V into the surface wave O during decoupling of the volume wave V.
    On the other hand, the propagation zone 48 and the reflective insert 38 have a second wall thickness T2 different from the first wall thickness T1 in the zone of all the reflection points of the volume wave V. It can Also, provision should be made for the reflective insert 38 to have a wall thickness different from that of the propagation zone 48.
    The second wall thickness T2 can be 20% to 95% greater than the first wall thickness T1, in the example shown, it is approximately 50% greater than the first wall thickness T1. In the zone in which the wall thickness T2 is greater, the surface waves O cannot propagate very well in the base body 28 or in the reflective insert 38. It is also more difficult to excite a thicker wall of the base body 28 to generate surface waves O. However, it is also possible to provide that the second wall thickness T2 is less than the first wall thickness T1, provided that the first wall thickness T1 in the coupling and / or decoupling zone 46 is optimized for optimal coupling or decoupling.
    Conversely, this means that better reflection of the volume wave V occurs at the reflection points on the inner face of the separation surface 35 on the fluid side of the propagation zone 48, because the wave coupling is made there. more difficult, at best completely prevented. It is thus possible to improve the intensity of the signal at the level of the acoustic signal transducer 30.
    The number and the position of the reflection points are defined by the dimensions of the fluid channel 24 and the angle Θ. Since the angle Θ depends on the speed of flow of the fluid in the fluid channel 24 and since the volume wave V has a wide wavefront, the zones of second wall thickness T2 have generous dimensions .
    The acoustic signal transducer 30 is preferably produced in the form of a piezoelectric transducer, in particular an interdigitated transducer, the surface waves O in the base body 28 being generated by the application of an alternating voltage.
    It is also possible to provide the mounting of a damping element 54 on the acoustic signal transducer 30. The damping element 54 prevents the surface acoustic wave O from inadvertently coupling into other components of the fluid measuring means 10. In addition, the damping element 54 reduces or prevents undesirable reflections, for example undesirable reflections on the body of the fluid 12.
    Figure 5 shows a second embodiment of the invention which corresponds substantially to the first embodiment, so that only the differences are explained below. Identical and functionally identical components have the same reference numbers.
    In the second embodiment of the fluid measurement means 10, a second fluid measurement module 26 is provided in place of the reflective insert 38. This makes it possible to measure the characteristic properties of the fluid using two modules for measuring fluid, in particular simultaneously or in a redundant manner. Synergistic effects can be obtained since the surface acoustic waves O are formed on either side of the fluid channel 24. It is thus easier to identify incorrect measurements or measurement artifacts and to take them into account. during the evaluation.
    - 19 The fluid housing 12 can in principle have a housing 56 in which it is possible to accommodate other modules such as evaluation electronics modules or the like. A wireless communication unit could for example be housed in the housing 56, by means of which the connection 5 to the acoustic signal transducer 30 could for example be made wirelessly.
    It is for example also conceivable to mount a cover, not shown here, adjacent to the housing 56, in order to create the storage space formed by the housing 56 for other components of the fluid measuring means 10.
    FIG. 5 shows in particular that the fluid housing 12 is made in one piece with the electronic housing 18.
    The various characteristics of the embodiments can of course be combined as desired. The features listed as differences from the second embodiment are in particular independent and may also be provided differently in the first embodiment.
    权利要求:
    Claims (14)
    [1" id="c-fr-0001]
    Claims
    1. Fluid measuring means (10), having a fluid housing (12) which includes a fluid inlet (14), a fluid outlet (16) and a fluid channel (24) which extends between the fluid inlet (14) and fluid outlet (16) and which is fluidly coupled to the fluid inlet (14) and the fluid outlet (16), the fluid housing (12) having a side facing the fluid channel (24), with which is associated a fluid measurement module (26) which is in direct contact with a fluid flowing through the fluid channel (24) to a separation surface (35 ) on the fluid side, the fluid measurement module (26) being surrounded by the fluid housing (12), the fluid measurement module (26) being arranged so as to generate acoustic surface waves (O) which propagate along the separation surface (35) on the fluid side of the fluid measurement module (26).
    [2" id="c-fr-0002]
    2. Fluid measurement means (10) according to claim 1, characterized in that the fluid measurement module (26) has at least one acoustic signal transducer (30) which is arranged so as to transmit and / or to measuring the surface wave (O) and a volume wave (V), in particular at least one reflection point (52) being provided for the volume wave (V) on an interior wall of the fluid channel (24 ).
    [3" id="c-fr-0003]
    3. Fluid measurement means (10) according to claim 2, characterized in that the fluid measurement module (26) has a cavity (32) in which the acoustic signal transducer (30) is arranged.
    [4" id="c-fr-0004]
    4. Fluid measurement means (10) according to claim 2 or 3, characterized in that the fluid measurement module (26) has in the area of the acoustic signal transducer (30) a reduced wall thickness (T1) .
    [5" id="c-fr-0005]
    5. Fluid measuring means (10) according to one of the preceding claims, characterized in that the fluid measuring module (26) comprises a metallic base body (28).
    [6" id="c-fr-0006]
    6. Fluid measuring means (10) according to one of the preceding claims, characterized in that the fluid housing (12) is made of a plastic material and is in particular an injection molded part.
    [7" id="c-fr-0007]
    7. Fluid measurement means (10) according to one of the preceding claims, characterized in that the fluid measurement module (26) is received in the fluid housing (12) in a fluid-tight manner and is in particular coated by injection.
    [8" id="c-fr-0008]
    8. Fluid measurement means (10) according to one of the preceding claims, characterized in that on the fluid channel side (24) which is opposite to the fluid measurement module (26), a reflective insert is provided. (38) and / or an additional fluid measurement module (26), the reflective insert (38) and / or the additional fluid measurement module (26) being in particular also surrounded by the fluid housing (12).
    [9" id="c-fr-0009]
    9. Fluid measuring means (10) according to one of the preceding claims, characterized in that the fluid measuring module (26) forms, together with the opposite reflective insert (38) and / or with the additional fluid measurement (26), a channel-shaped insertion unit (40), the fluid measurement module (26) being in particular connected to the reflective insert (38) and / or to the measurement module additional fluid (26) by two side walls (39).
    [10" id="c-fr-0010]
    10. Fluid measuring means (10) according to one of the preceding claims, characterized in that the cross section of the fluid channel (24) is angular and / or in that the fluid inlet (14) and the fluid outlet (16) each have a circular cross section, the fluid channel (24) being in particular made in one piece with the fluid inlet (14) and / or the fluid outlet (16).
    [11" id="c-fr-0011]
    11. Fluid measurement means (10) according to one of the preceding claims, characterized in that the fluid housing (12) comprises a section of measurement channel (37) which extends along a recess ( 36) of the fluid housing (12) in which the fluid measurement module (26) is arranged.
    [12" id="c-fr-0012]
    12. Fluid measurement means (10) according to one of the preceding claims, characterized in that a damping element (54) is provided at at least one end of the fluid measurement module (26).
    [13" id="c-fr-0013]
    13. Method for manufacturing a fluid measurement means (10), comprising the following steps:
    installation of a fluid measurement module (26) in an injection molding mold, and
    5 - coating of the fluid measurement module (26) by injection to produce a fluid housing (12) of the fluid measurement means (10) which has a fluid channel (24), so that the measurement module of fluid (26) is surrounded by the module housing (12).
    [14" id="c-fr-0014]
    14. Method according to claim 13, characterized in that a material
    10 plastic is used to coat the fluid measurement module (26) by injection and make the fluid housing (12).
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    同族专利:
    公开号 | 公开日
    DE102019124454A1|2020-03-26|
    CN110940385A|2020-03-31|
    US20200096372A1|2020-03-26|
    FR3086388B1|2021-06-04|
    US11204269B2|2021-12-21|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US4735097A|1985-08-12|1988-04-05|Panametrics, Inc.|Method and apparatus for measuring fluid characteristics using surface generated volumetric interrogation signals|
    US4838127A|1986-09-29|1989-06-13|Altometer, Produktiebedrijf Van Rheometron A.G.|Ultrasonic flow meter|
    US6609430B1|2000-05-09|2003-08-26|Shrinivas G. Joshi|Low profile transducer for flow meters|
    US20120272750A1|2009-11-24|2012-11-01|Panasonic Corporation|Ultrasonic fluid-measuring structure and ultrasonic fluid-measuring apparatus|
    DE19729473A1|1997-07-10|1999-02-04|Meinecke Ag H|Ultrasonic flow meter|
    US6418796B1|1999-05-06|2002-07-16|Joseph Baumoel|Sonic flow measurement apparatus for tubes including sonically matched plates|
    DE102004060063B4|2004-12-14|2016-10-20|Robert Bosch Gmbh|Device for flow measurement by means of ultrasound|
    DE102005041288A1|2005-08-31|2007-03-01|GEMÜ Gebr. Müller Apparatebau GmbH & Co. KG|Flow meter for measuring flow rate of a fluid flowing through a conduit using ultrasound|
    CN102147274A|2010-12-27|2011-08-10|吉林市宏远仪表有限责任公司|Compound flow tube for ultrasonic heat meter|
    US9752907B2|2015-04-14|2017-09-05|Joseph Baumoel|Phase controlled variable angle ultrasonic flow meter|
    DE102017006909A1|2017-07-20|2019-01-24|Diehl Metering Gmbh|Measuring module for determining a fluid size|FR3080683A1|2018-04-30|2019-11-01|Buerkert Werke Gmbh|MEANS OF MEASURING FLUID|
    DE102020121678A1|2020-08-18|2022-02-24|Endress+Hauser Flowtec Ag|Ultrasonic measuring device and method of manufacture|
    法律状态:
    2019-09-26| PLFP| Fee payment|Year of fee payment: 2 |
    2020-03-27| PLSC| Publication of the preliminary search report|Effective date: 20200327 |
    2020-09-14| PLFP| Fee payment|Year of fee payment: 3 |
    2021-09-21| PLFP| Fee payment|Year of fee payment: 4 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1858705A|FR3086388B1|2018-09-25|2018-09-25|MEASURING MEANS OF FLUID PRESENTING A FLUID BOX, AND METHOD FOR MANUFACTURING A FLUID BOX|FR1858705A| FR3086388B1|2018-09-25|2018-09-25|MEASURING MEANS OF FLUID PRESENTING A FLUID BOX, AND METHOD FOR MANUFACTURING A FLUID BOX|
    DE102019124454.4A| DE102019124454A1|2018-09-25|2019-09-11|Fluid measuring device with a fluid housing and method for producing a fluid housing|
    CN201910910491.6A| CN110940385A|2018-09-25|2019-09-25|Fluid measuring device with a fluid housing and method for producing a fluid housing|
    US16/581,974| US11204269B2|2018-09-25|2019-09-25|Fluid meter with a fluid housing and method for producing a fluid housing|
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