• 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:
    A density measuring device for determining the density of fluid media has a hollow body (1) for receiving the fluid medium to be examined. The hollow body (1) comprises at least two parallel pipe sections (6, 6a, 7, 7a) and a connecting line (9) at a first end of the at least two parallel pipe sections (6, 6a, 7, 7a), which comprise the at least two parallel sections Pipe sections (6 '6a, 7' 7a) U-shaped interconnects. At a second end of the at least two parallel pipe sections (6, 6a, 7, 7a), the hollow body (1) is provided with a clamping element (2) having at least two clamping tubes (5, 5a) into which clamping tubes (5, 5a) at least two parallel pipe sections (6, 6a, 7, 7a) open. An exciter device comprising a piezoelectric element (4) for exciting a vibration of the pipe sections and a sensor device for detecting an excited vibration characterizing a piezoelectric element (4) are provided in the density measuring device, wherein the piezoelectric element (4) of the excitation device and the piezoelectric element (4a) of the sensor device are fastened to a respective contact region (3, 3a) of the clamping element (2) in a respective plane parallel to the planes defined by the longitudinal axes of the at least two pipe sections (6, 6a, 7, 7a). In this case, the contact regions (3, 3a) of the clamping element (2) are arranged on the proximal end of the clamping element (2) with respect to the at least two tube sections (6, 6a, 7, 7a). Each contact region (3, 3a) extends over both clamping tubes (5, 5a) and each of the piezoelectric elements (4, 4a) also extends over both clamping tubes (5, 5a) in the direction of the extension of its longest side.
    公开号:AT520318A4
    申请号:T429/2017
    申请日:2017-11-06
    公开日:2019-03-15
    发明作者:Diepold Andreas；Edelsbrunner Helmut；Illenberger Johannes；Senn Helmuth
    申请人:Mettler Toledo Gmbh；
    IPC主号:
    专利说明:

    The invention relates to a density measuring device for determining the density of fluid media with a hollow body designed as a bending oscillator for receiving the fluid medium to be examined.
    The density measurement of fluid media with a flexural vibrator is based on the fact that the natural vibrations of a tube filled with the fluid medium change with the density of the medium. By measuring the vibration system characterizing parameters such as amplitude and / or attenuation, quality, loss angle, and / or harmonics, but in particular period or frequency, a natural vibration after excitation with suitable frequencies and determining the response of the vibration system, among other things, determines the density become.
    EP 3015847 A1 discloses a method and a measuring device for density measurement of fluid media. In this case, as a density sensor, a bending vibrator with mass balance, in particular a so-called Faltschwinger or Doppelbugschwinger, is set. Magnetic systems and piezoelectric elements which are arranged in the bending regions of the mutually parallel tubes of the folding oscillator, wherein the bending regions are located on the distal end of the tubes with respect to the end connections of the tubes, are suitable as the exciter device and sensor device. The flexural vibrator with mass balance and the associated measuring and sensor electronics is enclosed with a housing or a cartridge, preferably on all sides. The cartridge is detachably or interchangeably connected to the meter for density measurement.
    The AT 12 626 Ul describes a density measuring device for determining the density of fluid media, which has a hollow body as a bending oscillator, which comprises two parallel pipe sections and is designed as a U-shaped tube. Furthermore, an excitation device and a sensor device are present, which comprise, for example, a piezoelectric element or a magnet system with a coil. The exciter device and the sensor device can, for example, be mounted on the outside of the parallel tube sections forming the U-shaped tube. It can also be provided that the exciter device for vibrational excitation is preferably arranged parallel to the plane formed by the longitudinal axes of the tube sections. There is a vibration excitation parallel to or in the sections formed by the longitudinal axes of the tube. The pipe sections are clamped at one end and are designed as X-swingers, which means that they oscillate in opposite directions in said plane. For density determination at least the period of one of the pipe sections is detected.
    A disadvantage of the embodiments according to the prior art is that the excitation device and the sensor device of the density measuring device - especially when using magnetic systems - can negatively influence the vibration system by their mass and their thermal capacity in sensitivity and response time. This is especially true when the excitation device and the sensor device are attached directly to the oscillating tubes. Further, there may be problems with crosstalk of signals and the excitation of unwanted modes of vibration, which may have a detrimental effect on density measurement.
    The object of the invention is to provide an easily produced density measuring device which has an improved sensitivity and thermal time constant over the prior art. Furthermore, the density measuring device should be subject to little influence by external vibrations.
    These objects are achieved with a density measuring device according to independent claim 1. The dependent claims relate to further advantageous embodiments of the density measuring device for determining the density of fluid media.
    A density measuring device for determining the density of fluid media has a hollow body for receiving the fluid medium to be examined. The hollow body comprises at least two parallel pipe sections, and a connecting line at a first end of the at least two parallel pipe sections, which connects the at least two parallel pipe sections in a U-shaped manner. At a second end of the at least two parallel pipe sections of the hollow body is provided with a clamping element having at least two clamping tubes, in which Einspannrohre the at least two parallel pipe sections open.
    An excitation device comprising a piezoelectric element for exciting a vibration of the tube sections and a sensor device comprising a piezoelectric element for detecting an amplitude characterizing an excited oscillation are provided in the density measuring device, wherein the piezoelectric element of the exciter device and the piezoelectric element of the sensor device are respectively connected to a contact region of the sensor device Clamping element in each one
    Level are mounted parallel to the planes spanned by the longitudinal axes of the at least two pipe sections. In this case, the contact regions of the clamping element are arranged on the proximal end of the clamping element with respect to the at least two tube sections. Each contact region extends over both clamping tubes and each of the piezoelectric elements also extends over both clamping tubes in the direction of the extension of its longest side.
    As a clamping element is the region of the hollow body, which serves to clamp the same in a holder understood. The hollow body is preferably designed in one piece and is preferably made of glass.
    The fact that the piezoelectric elements extend in the extension of their longest side almost over the entire width of a respective contact area, that is in each case with two Einspannrohren in contact, the at least two pipe sections of the hollow body are excited simultaneously and with approximately the same amplitude to vibrate and Accordingly, the signals of the oscillating hollow body are equally detected over two pipe sections, which leads to a one-sided excitation and recording of the vibration signal on each pipe section, as disclosed in the prior art, to a higher amplitude of the exciter and the sensor signal, thus also to a improved sensitivity of the density measuring device for determining the density of fluid media. Furthermore, the arrangement of the piezoelectric elements improves the symmetry of the vibration system.
    The piezoelectric element of the exciter device and the piezoelectric element of the sensor device are arranged on a less sensitive part of the hollow body, namely the clamping element. Therefore, their influence is reduced to the vibrations of the hollow body, that is, the pipe sections can oscillate largely free. In addition, the risk of glass breakage is reduced by a lower mass of the oscillating parts of the hollow body.
    In addition, due to their small mass in comparison to a magnetically based excitation device and / or sensor device, the piezoelectric elements reduce the influence on the oscillations of the hollow body. Mechanically, this lower mass causes increased sensitivity of the sensor. In thermal terms, this lower mass causes a temporally shortened thermal compensation.
    Both the mounting location of the piezoelectric elements, namely the clamping element, and the comparatively low mass of the piezoelectric elements lead to a shortened thermal time constant of the vibration system. The shortening of the thermal time constant and thus the warm-up time of the density measuring device is also further improved by the fact that the use of magnetic coils that can heat the hollow body is eliminated.
    Due to the structurally simplified construction, such a density measuring device is easier and less expensive to produce.
    In a particularly advantageous embodiment, the contact regions of the clamping element are designed as parallel aligned flats of the lateral surfaces of the respective Einspannrohre.
    In a preferred embodiment, the clamping tubes of the clamping element are fused together at their distal end relative to the at least two tube sections and separated by a gap at their proximal end with respect to the at least two tube sections. In this case correspond to the contact areas of the clamping element in its extension parallel to the central longitudinal axis of the Einspannrohre maximum Län ge of the gap. This leads to an increased stability of the area of the vibration excitation.
    With preference, the density measuring device is characterized in that the clamping tubes comprises two conically tapered to the pipe sections, their wall thickness and their outer diameter reducing glass tubes, which are fused at its proximal end to the pipe sections.
    As a result of the fusion of the clamping tubes, which are preferably made of glass, with the tube sections which are likewise preferably made of glass, the inner diameter of the clamping tubes and the inner diameter of the tube sections are the same and also have a smooth and trouble-free inner surface in the region of the transition. This creates a one-piece hollow body. In particular, the wall thickness of the Einspannrohre is at least six times the wall thickness of the pipe sections, whereby a further increase in the stability of the vibration excitation serving area is ensured.
    In a particularly advantageous embodiment of the density measuring device, the clamping tubes of the clamping element at its, with respect to the at least two pipe sections distal end terminals for the supply and discharge of fluid media.
    In a particularly preferred embodiment of the density measuring device, the hollow body is designed as a folding oscillator with four parallel pipe sections, wherein the two connected by the U-shaped connecting pipe sections in a plane parallel to the plane defined by the central longitudinal axes of the Einspannrohre and the central longitudinal axes of the other two pipe sections plane arranged and connected by bending points with these, wherein the U-shaped connecting line facing the proximal end of the clamping element.
    The design of the hollow body as a so-called Faltschwinger with four parallel pipe sections has the advantage that in a relatively small space creates a vibrational structure for the fluid to be examined. A folding transducer is therefore a U-tube, which is bent back at the bending points. It is important that the pipe sections are always parallel to each other and span the central longitudinal axes of two pipe sections of the U-tube two mutually parallel planes. The vibrations take place in opposite directions in the through the central longitudinal axes of the planes defined by the pipe sections.
    The U-shaped connecting line at the first end of the at least two parallel pipe sections can be stiffened by a stabilizing element, in particular a stiffening cross.
    In a specific embodiment of the density measuring device, a holder may comprise the clamping element near its distal end, which holder is connected to a printed circuit board which is connected to the electronics for exciting the piezoelectric element of the exciter device and those for receiving the signal which is detected by the piezoelectric element of the sensor device is, is stocked.
    The symmetry properties of the density measuring device are increased in a special way by the fact that the excitation device and the sensor device comprise identical piezoelectric elements, in particular of piezoelectric ceramic. For the electrical contacting, the piezoelectric element of the exciter device and the piezoelectric element of the sensor device have electrodes in the form of a structured metallic coating of the respective piezoelectric element. In this case, a first electrical lead with a first electrode of a piezoelectric element is attached to the contact region of the clamping element facing away from the surface of the piezoelectric element and a second electrical lead with a second electrode of a piezoelectric element also on the contact region of the clamping element facing away from the piezoelectric element Elements attached, wherein the second electrode is electrically conductively connected by Um-contacting over the end face of the piezoelectric element with a metallic coating on the contact area facing surface of the piezoelectric element. The electrical contacting of the piezoelectric elements can be produced by means of soldering or by means of a conductive adhesive or by a spring contact.
    The invention will be explained below with reference to the highly schematic drawings. Show it:
    1 is a perspective view of the density measuring device for determining the density of fluid media.
    FIG. 2 shows the sealing measuring device from FIG. 1 in a side view; FIG.
    FIG. 3 shows the density measuring device of FIG. 1 in plan view; FIG.
    Figure 4 is a perspective view of the attached in a holder and connected to a circuit board sealing measuring device for determining the density of fluid media.
    Fig. 5 is a block diagram for the connection of the piezoelectric elements.
    The density measuring device is designed in the figures as a so-called folding oscillator. A Faltschwinger is a U-tube, which is bent back at the bending points. It is important that the pipe sections are always parallel to each other and span the central longitudinal axes of two pipe sections of the U-tube two mutually parallel planes.
    The oscillatory movements of the pipe sections or the two U-tube legs, regardless of whether they form a simple U-tube oscillator or whether they are folded back into forming a folding oscillator, take place in opposite directions in or through the central longitudinal axes of the two U-tube legs Level or levels. This results in that a counterweight is not required, since the mass forces cancel each other in the oscillation movement.
    FIG. 1 shows a perspective view of the hollow body 1 of the density measuring device for determining the density of fluid media. For the determination of the density is the fluid medium in the hollow body 1. A clamping element 2 of the hollow body 1 is used for clamping the hollow body 1 in a Hal sion and comprises two parallel aligned clamping tubes 5, 5a.
    The figure 1 also shows each opposite each other - drawn in the figure 1 above and below - arranged on the clamping element 2, depending on a contact area 3, 3a, wherein the contact areas 3, 3a represent flats on the circular lateral surfaces of the clamping element 2. The contact areas 3, 3a each extend over the two clamping tubes 5, 5a. Depending on a piezoelectric elements 4, 4a is attached to one of the respective opposite contact areas 3, 3a, preferably glued. The piezoelectric elements 4, 4a extend over almost the entire width of a respective contact region 3, 3a, that is to say they are in each case in contact with both clamping tubes 5, 5a. The piezoelectric elements 4, 4 are components of an exciter device and a sensor device, which excites the hollow body 1 to vibrate and absorbs the vibrations of the hollow body 1. In this case, the functions of excitation and absorption of vibrations by the wiring of the exciter device and the sensor device are predetermined, but also each of the piezoelectric elements 4, 4a can be acted upon with one, as well as the other function. Preferably, but not necessarily, the piezoelectric elements 4, 4a are configured in the same way. As a preferred material for the piezoelectric elements 4, 4a is a piezoceramic, which is known under the trade name PIC255 PI-Ceramic in Germany, in question.
    Near the contact areas 3, 3 a, the clamping tubes 5, 5 a of the clamping element 2 taper and merge into two parallel tube sections 6, 6 a. The clamping tubes 5, 5a are fused together at their distal end with respect to the two tube sections 6, 6a and separated by a gap at their proximal end with respect to the at least two tube sections 6, 6a (see FIG. 3). The taper of the Einspannrohre 5, 5a is carried out by decreasing the wall thickness, that is, the wall thickness of the Einspannrohre 5, 5a is at least a factor of 6 higher than the wall thickness of the pipe sections 6, 6a. As a result of the fusion of the clamping tubes 5, 5a, which are preferably made of glass, with the pipe sections 6, 6a, which are likewise preferably made of glass, the inside diameter of the clamping tubes 5, 5a and the pipe sections 6, 6a is the same and also has a smooth and trouble-free in the region of the transition Surface on. The length of the gap corresponds at least to the extent of the contact regions 3, 3a in the direction along the central longitudinal axis of the pipe sections 6, 6a (see FIG. 3).
    The two parallel pipe sections 6, 6a are at their end facing away from the clamping element 2 U-shaped - in the figure 1 upwards - bent and set in a plane - in the figure 1 above - parallel to the central longitudinal axes of the pipe sections 6, 6a spanned plane, also parallel to each other and to the pipe sections 6, 6a as pipe sections 7, 7a on. These bending points 8, 8a are each in a plane perpendicular to the plane defined by the pipe sections 6, 6a and 7, 7a levels. At its end facing the clamping element 2, the two pipe sections 7 and 7a are connected to one another by a U-shaped connecting line 9 lying in the plane of the pipe sections 7, 7a facing the proximal end of the clamping element 2, so that starting with the clamping tubes 5, 5a via the pipe sections 6, 6a, the bending points 8, 8a and the pipe sections 7, 7a and the connecting U-shaped connecting line 9, a continuous cavity of the hollow body 1 for receiving the fluid medium is formed.
    Thus, the hollow body 1 forms a so-called Faltschwinger with four parallel pipe sections 6, 6a, 7, 7a. This arrangement has the advantage that in a relatively small space, a vibration structure for the fluid to be examined is formed. The vibrations take place in the opposite direction by the
    Central longitudinal axes of the through the pipe sections 6, 6a and the plane defined by the pipe sections 7, 7a levels.
    A stabilizing element 10 in the bow interior of the U-shaped connecting line 9 serves to stiffen. This stabilizing element 10 is advantageous, but not mandatory.
    FIG. 2 shows the hollow body 1 of the density measuring device from FIG. 1 in a side view and FIG. 3 in a plan view. With A and B, the central longitudinal axes of the pipe sections 6 and 7 are designated in Figure 2. These clamp together with the not visible in Figure 2 central longitudinal axes of the pipe sections 6a, 7a two mutually parallel planes in which the pipe sections 6, 6a, 7, 7a of the folding rocker extend. Likewise, as shown in FIG. 3, the clamping tubes 5, 5a of the clamping element 2 extend in the plane defined by the central longitudinal axes A, A '. This means that the central longitudinal axes A, A' of the tube sections 6, 6a also encompass the central longitudinal axes Clamping tubes 5, 5a form.
    The lateral surfaces of the respective clamping tubes 5, 5a are flattened near their proximal end in relation to the tube sections and form the planar contact regions 3, 3a, which run parallel to the plane formed by the central longitudinal axes A, A '. On these contact areas 3, 3a, one of which can be seen in FIG. 2, one at the top and one at the bottom on the clamping element 2, the piezoelectric elements 4, 4a are fastened, preferably adhesively bonded. The adhesive material is a known from the attachment of strain gauges adhesive material is used. The piezoelectric elements 4, 4a are also arranged in their planar extension in each case one plane parallel to the plane of the central longitudinal axes A, A1 in tensioned plane.
    In the figure 3, the hollow body 1 can be seen in the plan.
    The piezoelectric element 4 attached to the contact region 3 has, on its side facing away from the contact region 3-in FIG. 3 facing the observer-two electrodes 11, 12 on which electrical leads 13, 14 are attached for the purpose of connecting the piezoelectric element 4. The electrodes 11, 12 are a structured metallic coating of the piezoelectric element 4, the electrode 11 representing a partial coating of the surface of the piezoelectric element 4 facing away from the contact region 3, and the electrode 12 having a preferably full-surface metallic coating of the contact region 3 facing surface of the piezoelectric element 4 is electrically connected. This electrically conductive connection continues via one of the end faces of the piezoelectric element 4 to the contact region 12, which covers a section of the surface of the piezoelectric element 4 facing away from the contact region 3, in a so-called re-contacting. The three other side surfaces of the piezoelectric element 4 are not coated. Likewise, an insulating region 16 on the contact region 3 facing away from the surface of the piezoelectric element 4 is uncoated and thus separates the electrode 11 from the electrode 12th
    A solder connection between the electrodes 11, 12 and the electrical leads 13, 14 is preferred. Alternatively, an electrically conductive connection can be made via a spring element or an adhesive bond with a conductive adhesive can be used.
    The supply lines 13, 14 are passed through the gap 15 in the clamping element 2 and guided to a printed circuit board acting as a carrier element (see Figure 4).
    The stabilizing element 10 is arranged in the figure 3 as T-förmi-ges structure in the bow interior of the U-shaped connecting line.
    As can be seen from FIGS. 1 to 3, the hollow body 1 is configured as a vibration structure symmetrically with respect to a symmetry plane S drawn in FIG. This plane of symmetry S is orthogonal to the planes A, A 'of the pipe sections 6, 6a and those of the axes B, B' of the pipe sections 7, 7a planes centered to the hollow body 1. For trouble-free operation of the density measuring device for determining the density Of fluid media, it is of particular importance that in the manufacture of the hollow body 1 and the arrangement of the piezoelectric elements 4, 4a, a high symmetry of the arrangement and the parts with respect to the plane S is maintained. For determining the density of fluid media, the piezoelectric element 4 forming the excitation device is excited in a broadband manner. In this case, the fundamental frequency - that is, the lowest resonance frequency of the vibration structure, which essentially comprises the pipe sections 6, 6a, 7, 7a and the bending points 8, 8a and the connecting line 9 connecting them, is recorded, and one by the filling with fluid medium of the vibration structure detected frequency shift of the resonant frequency detected. The reference measurement used is either the resonant frequency of the unfilled vibration structure or that of a vibration structure filled with a medium of known density, for example water. The frequency for determining the density of a fluid medium is close to 1 kHz with the described and illustrated density measuring devices for determining the density of fluid media.
    FIG. 4 shows in a perspective view the hollow body 1 clamped in a holder 18. The holder 18 surrounds the clamping element 2 of the hollow body 1 as a kind of yoke and is fastened to a printed circuit board 19. This printed circuit board 19 is equipped with the electronics for exciting the piezoelectric element of the excitation device and those for receiving the signal which is detected by the piezoelectric element of the sensor device. The circuit board 19 may also be equipped with a memory element on which the density measuring device for determining the density of fluid media characterizing parameters, in particular calibration data are stored.
    Arrows indicate the connections for filling or emptying the hollow body with the fluid medium to be examined. Of course, the two fluid connections 20 of the clamping element 2 can also be reversed with regard to their function "inlet" and "outlet". Likewise, the determination of the density of a fluid medium can also be carried out in the flow-through mode of the hollow body 1. It is important to avoid the formation of air bubbles.
    FIG. 4 also shows the electrodes 11, 12 and the electrical connections of the piezoelectric element 4. The electrical leads 13, 14 to the piezoelectric element 4 are guided through the gap 15 to the circuit board 19 and contacted there in contact points 21. It can be partially seen in FIG. 4 that the piezoelectric element 4a is also contacted in an analogous manner.
    FIG. 5 shows a diagram for the connection of the piezoelectric elements 4, 4a. The electrical signal of the exciter device is applied to the input side of the amplifier device. The piezoelectric element 4 is here associated with the excitation device and the piezoelectric element 4a of the sensor device.
    A preamplifier unit 22 amplifies the signal taken from the piezoelectric element 4a. This signal characterizes the displacement of the resonant frequency of the oscillating hollow body 1 produced by the fluid medium contained in the hollow body 1 with respect to the resonant frequency of a reference measurement, ie a measurement with an empty hollow body or hollow body 1 filled with a fluid medium of known density.
    The filter device 25 filters out unwanted signal components. These are those signal components which do not coincide with the natural vibration of the hollow body 1 selected for the measurement of the density of a fluid medium and may contain, for example, unused harmonics or crosstalk signals.
    The limiter circuit 24 is responsible for a stable signal with sufficient gain. The output stage 23 adjusts the amplitude to the requirement of the piezoelectric element of the excitation unit and establishes the required phase condition.
    The invention has been shown and described with reference to preferred embodiments. However, other embodiments and refinements of the invention, which are not described here in detail, are to be encompassed by the scope of protection.
    List of Reference Numbers 1 Hollow body of the density measuring device 2 Clamping element 3, 3a Contact areas 4, 4a Piezoelectric elements 5, 5a Clamping tubes 6, 6a Tube sections 7, 7a Tube sections 8, 8a Bending points 9 U-shaped connecting line 10 Stabilizing element 11 Electrode at the piezoelectric element 12 Electrode at the piezoelectric element Element 13 electrical supply line 14 electrical supply line 15 gap 16 isolation area 18 mounting of the hollow body 19 printed circuit board 20 fluid connections 21 contact points 22 preamplifier unit 23 output stage or excitation amplifier 24 limiter or limiter circuit 25 filter A, A1 central longitudinal axis n of the pipe sections 6, 6a B, B 'medial longitudinal axis n of Pipe sections 7, 7a S symmetry plane
    权利要求:
    Claims (15)
    [1]
    A density measuring device for determining the density of fluid media, comprising: a hollow body (1) for receiving the fluid medium to be examined, wherein the hollow body (1) at least two parallel pipe sections (6, 6a, 7, 7a) comprises, and a connecting line (9) at a first end of the at least two parallel pipe sections (6, 6a, 7, 7a), which connects the at least two parallel pipe sections (6, 6a, 7, 7a) U-shaped, and with at least two clamping tubes ( 5, 5a) having clamping element (2) at a second end of the at least two parallel pipe sections (6, 6a, 7, 7a) is provided, in which Einspannrohre (5, 5a) the Minim least two parallel pipe sections (6, 6a, 7th , 7a), wherein a piezoelectric element (4) comprising excitation means for exciting a vibration of the at least two parallel pipe sections (6, 6a, 7, 7a) as a piezoelectric element (4a) comprising sensor means for Erfa Sung of an excited vibration characterizing size is present, characterized in that the piezoelectric element (4) of the exciter device and the piezoelectric element (4a) of the sensor device at each contact area (3, 3a) of the clamping element (2) in each case in a plane parallel are fastened to the plane defined by the central longitudinal axes (A, A ', B, B1) of the at least two parallel pipe sections (6, 6a, 7, 7a), wherein the contact regions (3, 3a) of the clamping element (2) are fixed in relation to on the at least two parallel pipe sections (6, 6a, 7, 7a) proximal end of the clamping element (2) are arranged and each contact region (3, 3a) extends over both clamping tubes (5, 5a), and wherein each of the piezoelectric elements (4, 4a) in the extension of its longest side also extends over both Einspannrohre (5, 5a).
    [2]
    2. Density measuring device according to claim 1, characterized in that the contact regions (3, 3a) of the clamping element (2) are designed as mutually parallel flats of the lateral surfaces of the respective Einspannrohre (5, 5a).
    [3]
    3. Density measuring device according to claim 1 or 2, characterized in that the Einspannrohre (5, 5 a) of the clamping element (2) at its with respect to the at least two parallel pipe sections (6, 6 a, 7, 7 a) distal end merged with each other are and at their with respect to the at least two parallel pipe sections (6, 6a, 7, 7a) proximal end separated by a gap (15).
    [4]
    4. Density measuring device according to claim 3, characterized in that the contact areas (3, 3a) of the clamping elements (2) in their extension parallel to the central longitudinal axis (A, A ') of the Einspannrohre (5, 5a) maximum of the length of the gap (15th ) correspond.
    [5]
    5. Density measuring device according to one of claims 1 to 4, characterized in that the Einspannrohre (5, 5a) comprises two conically tapered to the pipe sections (6, 6a, 7, 7a), their wall thickness and their outer diameter reducing glass tubes comprising at its proximal end with the pipe sections (6, 6a, 7, 7a) are melted ver.
    [6]
    6. Density measuring device according to claim 5, characterized in that the wall thickness of the Einspannrohre (5, 5a) is at least six times the wall thickness of the pipe sections (6, 6a, 7, 7a).
    [7]
    7. Density measuring device according to claim 1, characterized in that the clamping tubes (5, 5a) of the clamping element (2) have fluid connections (in their relation to the at least two tube sections (6, 6a, 7, 7a)). 20) for the supply and discharge of fluid media.
    [8]
    8. Density measuring device according to one of claims 1 to 7, characterized in that the hollow body (1) as Faltschwinger with four parallel pipe sections (6, 6a, 7, 7a) is configured, wherein the two each through the U-shaped connecting line (9 ) connected pipe sections (7, 7a) in a plane parallel to the through the central longitudinal axes (B, B ') of the Einspannrohre (7, 7a) and the other two pipe sections (6, 6a) spanned plane (A, A') are arranged and the U-shaped Verbindungslei device (9) to the proximal end of the clamping element (2) has.
    [9]
    9. Density measuring device according to one of claims 1 to 8, characterized in that the U-shaped connecting line (9) at the first end of the at least two parallel pipe sections, by a stabilizing element (10) is stiffened.
    [10]
    10. Density measuring device according to claim 9, characterized in that the stabilizing element (10) is designed as a stiffening cross.
    [11]
    11. Density measuring device according to one of claims 1 to 10, characterized in that a holder (18) comprises the clamping element (2) near its distal end, which holder (18) is connected to a printed circuit board (19) connected to the electronics for Excitation of the piezoelectric element (4) of the excitation device as well as those for receiving the signal which is detected by the piezoelectric element (4) of the sensor device is equipped.
    [12]
    12. Density measuring device according to one of claims 1 to 11, characterized in that the exciter device and the sensor device gleichgeartete piezoelectric elements (4, 4a), in particular of piezoelectric ceramic include.
    [13]
    13. Density measuring device according to one of claims 1 to 12, characterized in that the piezoelectric element (4) of the exciter device and the piezoelectric element of the sensor device (4a) electrodes (11, 12) in the form of a structured metallic coating of the respective piezoelectric element (4 , 4a).
    [14]
    14. Density measuring device according to claim 13, characterized in that a first electrical supply line (13) having a first electrode (11) of a piezoelectric element (4, 4 a) facing away from the contact region (3, 3 a) of the clamping element A (2) Surface of the piezoelectric element (4, 4 a) is mounted, and a second electrical see feed line (14) with a second electrode (12) of a piezoelectric element (4, 4 a) on the contact region (3, 3 a) of the clamping element (2 ) facing away from the piezoelectric element (4, 4a) is mounted, wherein the second electrode (12) by Um-contacting over the end face of the piezoelectric element (4, 4a) with a metallic coating on the contact region (3, 3a) facing Surface of the piezoelectric element (4, 4a) is electrically connected.
    [15]
    15. Density measuring device according to claims 1 to 14, characterized in that the electrical contacting of the piezoelectric elements (4, 4 a) is produced by means of soldering or by means of a conductive adhesive or by a spring contact.
    类似技术:
    公开号 | 公开日 | 专利标题
    AT520318B1|2019-03-15|Density measuring device for determining the density of fluid media
    DE19520217C2|1997-09-04|Piezoelectric resonance component of the chip type
    DE102004045199B4|2006-08-17|Measuring device and method for determining temperature and / or pressure and use of the measuring device
    DE102006033819A1|2008-01-24|Device for determining and / or monitoring a process variable of a medium
    WO2001075399A2|2001-10-11|Mass flow rate measuring device
    DE2553638A1|1976-08-05|DEVICE FOR MEASURING MASSES
    DE1773815B2|1974-09-12|Device for determining when a predetermined fill level has been reached in a container
    DE102010018223A1|2011-10-27|Coriolis mass flowmeter
    WO2010040582A1|2010-04-15|Device for determining and/or monitoring a process parameter of a medium
    WO2007093197A1|2007-08-23|Vibration limiting switch arrangement and method for correcting a vibration limiting switch switching point
    DE3534288C2|1988-05-05|
    EP1825230B1|2014-03-12|Vibratory measuring sensor
    EP1597545B1|2006-10-11|Protection against the effects of condensate bridges
    DE1648690B2|1978-01-19|TRANSMITTER FOR FLUID PRESSURE
    DE4327052A1|1995-02-16|Device for measuring the mass of liquids and gases
    AT516281B1|2016-04-15|Method for determining the degree of filling of a transducer tube of a bending vibrator and bending vibrator
    DE2434682B2|1976-09-23|ELECTROMECHANICAL TONGUE FILTER WITH HIGH FREQUENCY STABILITY
    DE102014115693A1|2016-05-04|Vibronic sensor
    DE4321949A1|1994-01-05|Vibrator unit using piezoelectric resonator - has coupling between resonator and resonance element attached at oscillation mode
    EP0871017B1|2008-07-30|Coriolis mass flow sensor with a measuring tube
    AT517082B1|2016-11-15|Measuring device for the examination of fluid samples
    DE102005013242B4|2009-04-02|sensor device
    DE10362048B4|2007-08-02|Device for determining and / or monitoring the layer thickness of a liquid medium
    DE4034883A1|1992-05-07|Vibrating tube-type liq. densimeter - has piezoelectric transducers within liq.-tight vibrating tube
    EP0624784B1|1997-07-16|Density sensor
    同族专利:
    公开号 | 公开日
    US10942101B2|2021-03-09|
    CN109752280A|2019-05-14|
    US20190137376A1|2019-05-09|
    AT520318B1|2019-03-15|
    DE102018004220A1|2019-05-09|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    CN201707277U|2010-03-31|2011-01-12|范凯|High-precision fluid density measurement sensor|
    AT12626U1|2011-03-11|2012-09-15|Messtechnik Dr Hans Stabinger Gmbh Lab F|DENSITY MEASURING DEVICE|
    AT514574B1|2013-10-17|2015-02-15|Für Messtechnik Dr Hans Stabinger Gmbh Lab|Density measurement device|
    EP3012612A1|2014-10-20|2016-04-27|Anton Paar GmbH|Method and device for determining the density of a fluid|
    US4655075A|1984-09-26|1987-04-07|University Of Delaware|Vibrating tube densimeter|
    JP2779292B2|1992-09-09|1998-07-23|京都電子工業株式会社|Vibration density meter|
    AT516421B1|2014-10-31|2016-07-15|Anton Paar Gmbh|Method and meter for density measurement of fluid media|
    AT516281B1|2014-11-03|2016-04-15|Anton Paar Gmbh|Method for determining the degree of filling of a transducer tube of a bending vibrator and bending vibrator|DE102019124314A1|2019-09-10|2021-03-11|Truedyne Sensors AG|Measuring device for measuring the density and / or viscosity of a liquid|
    DE102019133459A1|2019-12-06|2021-06-10|Endress+Hauser Flowtec Ag|Sensor of a measuring device for detecting a mass flow rate, a viscosity, a density and / or a variable derived therefrom of a flowable medium|
    WO2021171121A1|2020-02-28|2021-09-02|Precision Planting Llc|Agricultural sampling system and related methods|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    ATA429/2017A|AT520318B1|2017-11-06|2017-11-06|Density measuring device for determining the density of fluid media|ATA429/2017A| AT520318B1|2017-11-06|2017-11-06|Density measuring device for determining the density of fluid media|
    DE102018004220.1A| DE102018004220A1|2017-11-06|2018-05-25|Density measuring device for determining the density of fluid media|
    US16/171,588| US10942101B2|2017-11-06|2018-10-26|Density measuring device for determining the density of fluid media|
    CN201811312644.9A| CN109752280A|2017-11-06|2018-11-06|For determining the density measuring equipment of the density of fluid media |
    [返回顶部]