• 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:
    In a flow meter, with a Verdrängerzähler (1) to which in a bypass line (2) a pressure difference transducer (3) is connected in parallel, wherein a rotationally connected to the Verdrängerzähler (1) motor (M) depends on one of the pressure difference transducer ( 3) detected differential pressure between inflow and outflow side (4, 5) of the positive displacement counter (1) is driven to the continuous differential pressure compensation, wherein the pressure difference transducer (3) in a cylinder region (6) of the bypass line (2) freely movable piston (7), the deflection (X) of the piston (7) caused by the differential pressure is measured by a magnetic sensor (10) and generates a corresponding sensor signal (S) which via a control unit (11) to a speed adaptation of the motor (M) of the positive displacement counter (1) is used.
    公开号:AT512619A2
    申请号:T504182013
    申请日:2013-06-26
    公开日:2013-09-15
    发明作者:
    申请人:Avl List Gmbh；
    IPC主号:
    专利说明:

    AV-3522 AT
    Flowmeter
    Flow meter, with a Verdrängerzähler, which is connected in parallel in a bypass line, a pressure difference sensor, wherein a rotatably connected to the positive displacement motor depending on a determined by the pressure difference transducer differential-5 pressure between inflow and outflow of Verdrängerzählers driven to the continuous differential pressure compensation is, wherein the pressure difference transducer has a freely movable in a cylinder region of the bypass line piston, which is determined by a differential pressure occurring deflection, and a corresponding sensor signal is generated which uses a control unit to a speed adjustment of the Mo-1 o gate of the positive displacement becomes.
    Such measuring devices are known for example from EP 1644707 B1 and GB 21857Θ5 A and have as central assemblies on a trained example as a gear counter positive displacement and a freely movable in a cylinder region of the bypass line parallel piston as a pressure difference transducer. 15 Liquid medium is discharged from the inflow side coming through the positive displacement in the direction downstream, with a controllable in its speed servomotor drives the positive displacement parallel to the positive displacement is the inlet side space of the cylinder portion of the pressure difference transducer with the inlet of the positive displacement and the drain-side space of this cylinder area connected to the downstream side of the Verdrängerzähters 20. By means of an electronic control system, the piston of the differential pressure sensor is ...... "positioned by means of a differential pressure compensator in its wet-cell furling."
    Each flow change causes a displacement of the piston, which is corrected immediately by means of a speed adaptation of the motor of the displacement counter, whereby the speed of this motor is directly proportional to the monitored flow. It can thus 25 minimal flows or flow changes are determined very accurately, as is very important, for example, for fuel consumption measurement on test benches for internal combustion engines.
    In order to be able to determine the deflection of said piston, a structure is described in EP 1644707 B1 in which the position of the piston is determined by means of an optical sensor which is combined with an additional pressure sensor for correction purposes. Apart from the additional design effort that such a combination of multiple sensors represents, the disadvantages of using optical sensors, such as high sensitivity to contamination of the optical elements and possible measurement errors due to scattering and refraction effects, are due to particulate loading of the sensor surrounding it Media, well known.
    "J® ·
    AV-3522 AT
    In quite similar arrangement, GB 2185785 A shows a position detector which operates on the Moire principle to determine the position of the piston. Thereby, two line patterns of different periods collide, whereby the best aligned line pair is evaluated. Depending on the period, even very small displacements can therefore be determined well. Since this principle is also an optical measuring method, the disadvantages already mentioned also come into play in this design. The higher the required resolution of the displacements to be measured, the smaller the period of the mentioned lines must be chosen, whereby the probability of measurement errors due to contamination increases greatly. Based on the above known devices, the object of the present invention is to determine the deflection of the freely movable piston as accurately as possible, while minimizing the susceptibility to interference and to simplify the structure as possible.
    This object is achieved according to the present invention in a measuring device of the type mentioned in that at least one magnetic element is arranged in the piston 15 whose field lines of at least one, arranged in the cylinder region and fixed relative to the piston, magnetic sensor are measured and in this way the exact deflection of the piston is detected. This allows the simplest possible structure of the measuring device. By avoiding the use of an optical device, there is also no need to provide corresponding input and output windows in the above-mentioned cylinder area. This eliminates the need for a structurally complex seal, while achieving greater pressure resistance. A further advantage when dispensing with optical devices is that there is no undercutting due to the installation of coupling and decoupling windows in the cylinder area, in which cases air bubbles collect and which would also form a disturbing interruption of the sliding surface ,
    The use of a magnetic measuring device allows a precise position determination of the piston, whereby impurities and particle loads in a measuring device of this design do not adversely affect the measurement result. In addition to a high sensitivity of the measurement in connection with a high measuring frequency, which can be up to 1 MHz 30, and the small footprint is to be regarded as advantageous.
    An advantageous embodiment of the invention provides that in the piston a plurality, preferably in the longitudinal direction along the longitudinal axis of the cylinder portion offset magnetic elements are arranged. As a result, the orientation is specified in a simple manner. An advantageous embodiment of the subject invention provides that the at least one magnetic element is arranged in the piston such that its center of gravity with the -2-
    AV-3522 AT
    Center of gravity of the piston coincides, or coincide with the use of multiple magnetic elements whose common center of gravity with the center of gravity of the piston. This avoids possible tilting of the piston within the cylinder area. In the form of a further advantageous embodiment, it is provided that the weight of the piston and the at least one magnetic element arranged therein correspond to the weight of the medium displaced by the piston in the cylinder region. As a result, pressure fluctuations directly and without inertia-related delays lead to a displacement of the piston. The piston can be made of appropriately reinforced 10 plastic which results, with appropriate choice of material, also a high compressive stiffness. Furthermore, this ensures that the piston moves neutrally in the medium and neither floats nor sinks, whereby in both cases the piston would rub against the cylinder walls.
    A further advantageous embodiment of the subject invention provides that a plurality of magnetic sensors 15 are provided for the measurement of the field lines, which are preferably offset from each other along the longitudinal axis and / or arranged offset to one another in the circumferential direction of the cylinder region. Advantageously enough, the magnetic sensors are partially or completely omnipolar magnetic sensors. The measuring device therefore works bidirectionally whereby the polarity of the magnet is irrelevant. In an advantageous manner, the magnetic sensors are positioned in an equidistant arrangement. Under equidistant arrangement, it is understood here that the magnetic sensors have the same distances from one another. The juxtaposition of several such advantageously listed magnetic sensors allows a division of the measuring range into several sections, whereby the position of the piston, for example, an reached end position, can be more accurately assigned 25. Furthermore, by juxtaposing the measuring range can be arbitrarily extended. The more magnetic sensors are used in the desired measuring range, the more accurately the position of the piston can be determined. The measuring range is divided into several sections. As a result, a section-wise linearization of the sensor signal is made possible whereby the linearization approaches the actual curve 30 even better, which in turn allows a more accurate position determination.
    With a single magnetic sensor, the typically required measuring range is already covered. The linearization is realized by means of tables or inversely calculated polynomials. This can already be done within the framework of the production, but is also possible later in the context of a diagnostic run, for example after a piston change. 35 If several magnetic sensors are strung together to form a sensor array, overlapping results in a continuous measuring range, for example, over the entire possible range.
    AV-3522 AT
    Piston travel. This creates the opportunity, for example, to detect the position of a clamping piston. Usually, however, the piston is deflected only slightly during operation.
    Advantageously, a continuous measuring range over the entire possible piston travel is visibly a shot-to-shot application. This leads to a drastic increase in the detectable single shot quantity.
    In a further advantageous embodiment of the subject invention, it is provided that in a sectional plane normal to the longitudinal axis of the cylinder area a plurality of magnetic sensors opposite or at different angles, for example 0 °, 120 ° and 240 ° io, are arranged on the circumference of the cylinder area. Thus, according to this variant, a plurality of, for example, two oppositely disposed magnetic sensors record the movements of the piston.
    Of course, as already described, in these advantageous arrangements, a plurality of magnetic sensors can be strung together to form sensor arrays. Such, before-15-part arrangements of the magnetic sensors additionally allow the determination of a piston offset normal to the longitudinal axis of the cylinder, or even the more accurate detection of a clamping piston.
    An advantageous embodiment of the invention provides that a plurality of such magnetic sensor arrangements are provided in the longitudinal direction of the cylinder region, that is, arrangements 20 with magnetic sensors angularly offset in pairs.
    A further advantageous embodiment of the invention provides that the cylinder area is made of austenitic steel. In addition to the high pressure resistance, this results in the advantage of only slight attenuation of the magnetic field, whereby the position determination is made possible at very low magnetic field strengths. In an advantageous manner, to compensate for the temperature dependence of the magnetic sensors and the magnetic element, a media temperature sensor can be used, which is usually arranged anyway in a volumetric flow meter. By determining the temperature of the medium, therefore, the resulting influence of the magnetic sensors and can be determined and compensated. The subject invention is explained in more detail below with reference to Figures 1 to 6, which shows by way of example, schematically and not limiting advantageous embodiments of the invention
    Fig.1 and Fig.4 different embodiments of the invention. 35
    2 and 3 detail sections of further embodiments in an enlarged view
    u ^ iiaadB
    Hi
    AV-3522 AT
    Fig.5a and Fig.Sb sections along the sectional plane V-V
    6 shows the course of a possible sensor signal
    The flow meter according to FIG. 1 has a positive displacement meter 1, which can be designed, for example, as a known gear meter and to which a pressure difference sensor 3 is connected in parallel in a bypass line 5. A rotatably connected to the positive displacement meter 1 motor M is controlled depending on a detected at the pressure difference transducer 3 differential pressure between inlet 4 and downstream 5 of the positive displacement 1 for continuous differential pressure compensation control unit 11.
    This control unit 11 is supplied both the sensor signal S and the power supply E io for the motor M. As a result, the control unit 11 can regulate the power supply of the motor M as a function of the sensor signal S, wherein the control unit 11, as shown in FIG. 1, for example, can be configured separately or can also be arranged within the motor M or the magnetic sensor 10. The pressure difference transducer 3 has a, in the cylinder region 6 of the bypass line 2, freely movable piston 7, which carries a magnetic element 8 in its center of gravity.
    The deflection -X / + X of the piston 7 from its center position, as shown by a differential pressure occurring, is determined by measuring the field lines 9 of the magnetic element 8 by a magnetic sensor 10 and thus detecting the exact position of the piston 7 , The magnetic sensor (s) 10 are arranged along the circumference of the cylindrical region 6. In the form of the sensor signal S generated by the magnetic sensor 10, the deflection -X / + X is transmitted to the control unit 11, whereby the motor M of the positive-displacement counter 1 is actuated accordingly.
    If, for example, on the downstream side 5 due to reduced consumption to a pressure increase or due to increased consumption to a Druckabnah-25 me, so the piston 7 in the cylinder area 6 to the right or left auswei-chen. As a result of the deflection -X / + X of the piston 7, the position of the field lines 9 generated by the magnetic element 8 changes. To reposition the piston 7 in its zero position (differential pressure = 0), the deflection -X / + X from the magnetic sensor Registered 10 and generates a corresponding sensor signal S which via the control unit 11 leads to a rotational 30-number adaptation of the motor M. The speed of the motor M and thus the displacement counter 1 is thus directly proportional to the flow.
    2 shows a detail of a variant of the invention, wherein a magnetic element 8 is arranged inside the piston 7 and the magnetic sensor 10 is designed as a sensor array by the juxtaposition of several sensors. The sensors of the sensor array 35 are parallel to the longitudinal axis 12 of the cylinder region 6 according to this embodiment hin-5-
    AV-3522 AT arranged one behind the other. As a result, an increased measurement accuracy can be achieved by overlapping measuring ranges.
    3 shows the invention in a further embodiment, wherein within the piston 7 a Magneteiement Θ and in the cylinder region 6 two oppositely arranged Magnetsen sors 10 are shown. The two magnetic sensors 10 are in turn carried out by the juxtaposition of multiple sensors as a sensor array.
    4 shows an advantageous embodiment of the invention, wherein inside the piston 7, two magnetic elements 8 and in the cylinder region 6, two oppositely arranged magnetic sensors 10 are shown. Again, the two magnetic sensors 10 are performed by the 10 series of multiple sensors as a sensor array.
    The two magnetic elements 8 are arranged in the piston 7, that they are offset along the longitudinal axis 12 of the cylinder portion 6 to each other, but their common center of gravity coincides with the center of gravity of the piston 7.
    In principle, other embodiments are possible in which more than two Mag-15 netelemente 8 are provided. Such variants may be necessary if the magnetic field or even weight of only one magnetic element 8 does not meet the requirements, for example, provides an advantageous variant of the invention that the weight of the piston 7 and / or the magnetic element / e 8 therein the weight of corresponds by the piston 7 in the cylinder region 6 displaced medium. In this way, the risk of tilting and thus jamming of the piston 7 in the cylinder region 6 can be reduced.
    The combination of a plurality of magnetic elements 8 in the piston 7 and magnetic systems 10 as an array in the cylinder region 6 allows not only the measurement of the displacement of the piston 7 along the longitudinal axis 12 of the cylinder portion 6 but also the detection of a tilting of the piston 7 in the cylinder region 6. Such tilting Occurs when the longitudinal center axis of the piston 7 is no longer parallel but at an angle to the longitudinal axis 12 of the Zyiinderbereichs 6 comes to rest.
    FIGS. 5a and 3b show, in a sectional view along the line V-V in FIG. 4, possible relative positions of magnetic sensors 10 or sensor arrays according to the described variants in which a plurality of sensors are provided.
    Fig.Sa shows a variant in which magnetic sensors 10 or arrays of magnetic sensors 10 are arranged opposite to each other. Such an embodiment allows in addition to the even more accurate measurement of the deflection of the piston 7 along the longitudinal axis 12 (not shown in Fig.5a) of the cylinder portion 6 in particular also the measurement of movements normal to this longitudinal axis.
    -6-
    AV-3522 AT
    FIG. 5b shows a variant in which three magnetic sensors 10 or three sensor arrays are arranged at different angles on the circumference of the cylinder region 6. In dargestetlten embodiment, the magnetic sensors 10 are each offset by 120 ° to each other. Basically, however, depending on the application, other angle control or 5 versions with a larger number of arrays are possible.
    Any combination of the illustrated embodiment variants is also possible - for example, embodiments according to FIG. 5a may follow one another with embodiments according to FIG. 5b along the longitudinal axis of the cylinder region.
    6 shows a possible sensor signal, as is the case with an arrangement shown in FIG. 2, that is to say when using a magnetic element 8 with a magnetic sensor 10 which results as a sensor array consisting of three equidistantly arranged magnetic sensors 10. The sensor signal S is applied via the position of the piston 7. As can be seen, the measuring range is divided into several sections, for example A to F, whereby a section-wise linearization is made possible. This allows a precise position determination of the piston in the pm range. -7-
    权利要求:
    Claims (5)
    [1]


    sl ·

    AV-3522 AT Claims 5 10 15 20 25 1. Flow meter, with a positive displacement meter (1), in which a pressure difference sensor (3) is connected in parallel in a bypass line (2), wherein a motor rotatably connected to the positive displacement counter (1) ( M) depending on a pressure difference sensor (3) detected differential pressure between inflow and outflow side (4, 5) of the positive displacement counter (1) is driven to the continuous differential pressure compensation, wherein the pressure difference transducer (3) one in a cylinder area ( 6) of the bypass line (2) has freely movable pistons (7) whose deflection (X) is determined by an occurring differential pressure, and a corresponding sensor signal (S) is generated which via a control unit (11) to a speed adaptation of the motor ( M) of the displacement counter (1) is used, characterized in that in the piston (7) at least one magnetic element (8) is arranged, the field lines (9) of at least one m, in the cylinder region (6) and arranged relative to the piston (7) fixed, magnetic sensor (10) are measured and in this way the exact deflection (-X / + X) of the piston (7) is detected. 2. Flowmeter according to claim 1, characterized in that in the piston (7) a plurality, preferably in the longitudinal direction along the longitudinal axis (12) of the cylinder region (6) offset magnetic elements (8) are arranged. 3. Flowmeter according to claim 1 or 2, characterized in that the at least one magnetic element (8) is arranged in such a manner in the piston (7) that its center of gravity coincides with the center of gravity of the piston (7). 4. Flowmeter according to one or more of claims 1 to 3, characterized in that the weight of the piston (7) and arranged therein, at least one, magnetic element (8) the weight of the piston (7) in the cylinder region (6). 5. Flowmeter according to one or more of claims 1 to 4, characterized in that a plurality of magnetic sensors (10) are provided for measuring the field lines (9), preferably along the longitudinal axis (12) offset from each other and / or in Circumferential direction of the cylinder portion (6) are arranged offset from each other. 6. Flowmeter according to claim 5, characterized in that the magnetic sensors (10) are positioned in equidistant arrangement. -8- 30 5 AV-3522 AT
    [2]
    7. Flowmeter according to one or more of claims 1 to 6, characterized in that in a sectional plane normal to the longitudinal axis (12) of the cylinder region (6) a plurality of magnetic sensors (10) opposite or at different angles, for example 0 °, 120 ° and 240th °, are arranged on the circumference of the cylinder region (6).
    [3]
    8. Flowmeter according to claim 7, characterized in that a plurality of such magnetic sensor arrangements are provided in the longitudinal direction of the cylinder region (6). 10 Θ. Flowmeter according to one or more of claims 1 to 8, characterized in that the magnetic sensors (10) are partially or completely omnipolar magnetic sensors.
    [4]
    10. Flowmeter according to one or more of claims 1 to 9, characterized in that the cylinder region (6) is made of austenitic steel. 15
    [5]
    11. Flowmeter according to one or more of claims 1 to 10, characterized in that a media temperature sensor is used to compensate for the temperature dependence of the magnetic sensors and the magnetic element. -9-
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    引用文献:
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    AT504182013A|AT512619B1|2013-06-26|2013-06-26|Flowmeter|AT504182013A| AT512619B1|2013-06-26|2013-06-26|Flowmeter|
    PCT/EP2014/062337| WO2014206767A1|2013-06-26|2014-06-13|Flowmeter|
    DE112014003050.3T| DE112014003050A5|2013-06-26|2014-06-13|Flowmeter|
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