EP3516347A1 - Füllstandsmessvorrichtung mit einem messrohr und abdeckvorrichtung für die füllstandsmessvorrichtung - Google Patents
Füllstandsmessvorrichtung mit einem messrohr und abdeckvorrichtung für die füllstandsmessvorrichtungInfo
- Publication number
- EP3516347A1 EP3516347A1 EP17768129.3A EP17768129A EP3516347A1 EP 3516347 A1 EP3516347 A1 EP 3516347A1 EP 17768129 A EP17768129 A EP 17768129A EP 3516347 A1 EP3516347 A1 EP 3516347A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- measuring tube
- tube
- measuring
- level
- displacement element
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
- G01F23/28—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring the variations of parameters of electromagnetic or acoustic waves applied directly to the liquid or fluent solid material
- G01F23/296—Acoustic waves
Definitions
- Level measuring device with a measuring tube and cover device for the level measuring device
- the invention relates to a level measuring device, such as may be provided in a motor vehicle in a fuel tank or an oil tank, for example.
- the level measuring ⁇ device has a measuring tube in which a liquid keits level changes according to the level of the container itself. To allow air to escape from the measuring tube, a vent opening is provided at its upper end.
- the invention also includes a covering device for such a measuring tube.
- a level sensor especially for an ultrasound-based level sensor, it is important in a motor vehicle to provide for the measurement a calmed, partially separated from the remaining fluid space measuring volume.
- a measuring tube which is arranged in the tank or container to be monitored and can run from a lower, open pipe end with the liquid.
- the measuring tube is cylindrical in shape and oriented substantially vertically in the container. So that the liquid level within the measuring volume of the measuring tube also corresponds to the level outside, at least one filling opening at the lower end and at least one vent opening at the upper tube end are necessary so that the liquid can rise in the measuring tube according to the principle of communicating tubes.
- the upper tube end of the measuring tube can be closed by a de ⁇ ckenwandung and the required at least one vent to the side, be provided transversely to the longitudinal axis of the measuring tube in an edge region or end portion of the cylindrical measuring tube itself.
- this can lead to the formation of an air bubble at the upper tube end of the measuring tube, which are no longer displaced by the rising liquid can, but is included and thus falsifies the measurement of the level.
- a further outer tube can be arranged around the measuring tube in order to further reduce sloshing of the liquid in the interior of the measuring tube.
- a reason for the inclusion of an air bubble at the upper tube end of the measuring tube may be that the capillary rise height of the liquid in the end region of the tube near the vent may be higher than in the actual measuring volume inside the measuring tube itself and thus the liquid in the upstream volume of the outer tube Ent ⁇ vent opening closes before the air can be completely displaced from the end of the measuring tube.
- the invention is based on the object, with increasing liquid level in a measuring tube, which is closed by a De ⁇ ckenwandung at the pipe end and having a vent, to ensure a reliable escape of the air.
- a level measuring device which may for example be adapted to determine a level of a liquid fuel, for example gasoline or diesel, in a fuel tank or a level of engine oil or water in a reservoir.
- the level measuring device has a measuring tube, which can be arranged in the manner described vertically or obliquely in a tank or container whose level is to be determined. Hereby is at the inside of the measuring tube a measurement volume ready, that is impaired or wave motion on the surface of flues ⁇ ing into the tank or container only to a reduced extent affected.
- the level measuring device further comprises a covering device for covering an edge or tube end of the measuring tube. The covering is provided for the arranged in the ⁇ be written arrangement above the tube end of the measuring tube. By covering the pipe end is closed or covered.
- the covering device may in this case be formed in one piece with the measuring tube, for example by forming the measuring tube with the covering device as
- the cover device can also be designed as an attachment or cover element for the pipe end of the measuring tube and placed or mounted on the measuring tube.
- a vent opening for venting the measuring tube is provided in an end region of the measuring tube adjoining the tube end when the liquid level rises in the measuring tube.
- the air contained in the interior of the tube can flow out of the vent opening, while liquid flows into the measuring tube, for example, from the lower tube end of the measuring tube.
- It can also be provided several vents. In the following, only one vent opening is described for the sake of clarity. So that is now prevented with increasing in the measuring tube liquid level an air bubble below the covering ⁇ device included and thereby the liquid level in the interior of the measuring tube is other than outside of the measuring tube, the invention provides that the waste covering device a Has extension or a displacement element. This displacement element protrudes into the measuring tube, starting from the pipe end, on which the covering device is arranged. Thus, therefore, the displacement ⁇ element is disposed in the end region within the measuring tube. The displacement element provides for better ventilation of the
- the displacement element Due to the body or the material of the displacement element forms to a cross section perpendicular to a longitudinal axis of the measuring tube, as is a clear cross-section, ie the cross ⁇ cut, which can be occupied by air and liquid is smaller in the end portion due to the displacement member as a corresponding light cross-section of the measuring tube beyond the end region, ie, for example in the middle or generally in the region adjacent to the end region, where the displacement element is missing.
- the displacement member may for example be shaped as a hemisphere or as a spherical segment or a cone or a truncated cone or a segment of a paraboloid or ellipsoid or shaped, and extend inwardly projecting from the Ab ⁇ covering device in the measuring tube.
- the shape does not have to be circularly symmetrical, but it can also be provided, for example, the shape of a pyramid.
- the displacement element can thus also be configured in the shape of a pyramid or pyramidal frustum.
- the air displaced by the liquid rising in the meter tube does not collect as a single large bubble in the end portion of the meter tube to flow out through the vent hole, but the displacer projecting into the air bladder forms the same
- the air bubble is first divided into a ring and, as the liquid continues to rise, it divides it into a number of smaller air bubbles, which can be more easily displaced out of the measuring volume through the ventilation opening.
- the air volume in the end region of the measuring tube is reduced by the displacement element, so that in principle less air has to be displaced or vented at all from the end region.
- the invention also includes advantageous developments, the characteristics of which provide additional advantages.
- the displacement element with respect to a longitudinal axis of the measuring tube, that is configured asymmetrically with vertically arranged measuring tube of the intended riser axis of the liquid.
- this asymmetry can be achieved for example by shearing the mold, so that, for example, an oblique cone or truncated cone is obtained.
- It may also be provided a shape of a cylinder with an oblique face or bottom. Due to an asymmetric configuration, there is the advantage that a remaining amount of air can be directed or guided to the vent opening.
- the displacement element does not have to fill the entire length of the measuring tube. Rather, it is preferably provided that the displacement element only in a smaller part of the total length of the measuring tube, in particular only up to a maximum of five times the distance, which has a lower edge of the vent opening facing away from the tube end toward the tube end, projects into the measuring tube. Preferably, the displacement element protrudes into the measuring tube only up to three times this distance. At least, however, preferably provided that the displacement element to the lower edge of the vent opening itself protrudes, ie, along the longitudinal axis to distance between the lower edge of the Ent ⁇ vent itself projects into the measuring tube. In this way, the displacement element can influence or adjust the surface of the liquid in the measuring tube in the manner described.
- the displacement element may be solid
- Injection molded part and thus be designed as part of the cover.
- a top wall of the cover is dented or bent or expressed, so that the displacement element is designed as a bulge of the tube end closing the ceiling wall. This results in no additional material requirement.
- the measuring tube can be surrounded by an outer tube arranged coaxially with respect to the measuring tube, so that a further volume results between the measuring tube and the outer tube, that is, a further cavity in which liquid can rise.
- the vent of the measuring tube then opens into this cavity of the outer tube. From there it can then escape through a further vent opening from the outer tube.
- the further vent opening in the outer tube is arranged in the circumferential direction offset by an offset angle relative to the vent opening of the measuring tube itself.
- the offset angle is in particular greater than 90 degrees and preferably has a value in the range of 170 degrees to 180 degrees and is thus arranged opposite the vent opening of the measuring tube.
- the level measuring device can have an ultrasonic transducer, ie an ultrasonic source which can also be operated as an ultrasonic sensor.
- the ultrasound transducer is arranged at a described the (upper) pipe end (which has the displacement ⁇ element) opposite the other pipe end of the measuring tube, that is the lower end in the intended arrangement pipe end.
- the ultrasonic transducer is accordingly adapted to emit ultrasound into the measuring tube towards the covering device at the other end of the tube. On the surface of the liquid contained in the measuring tube then results in a reflection effect, so by means of
- Ultrasonic transducer is received an ultrasonic echo whose duration or time of receipt depends on the liquid level ⁇ .
- a control device is set up to determine the liquid level in the measuring tube by means of the ultrasound transducer. This can be done in a manner known in the art.
- the displacement element By means of the displacement element, it is now ensured that in the case of a measuring tube completely or more than 95 percent full of liquid, no incorrect level is measured, as could result from a trapped air bubble.
- the displacement element can be used to specifically align the echo by forming and / or aligning a surface of the displacement element facing the ultrasonic transducer.
- the shape of the displacement element is designed such that the ultrasonic measurement signal is reflected back to the ultrasonic transducer by the displacement element, for example, as a truncated cone with the ultrasonic transducer of the surface is configured.
- a reflection of the ultrasonic measuring signal is executed away from the ultrasonic transducer ⁇ by the displacement element, for example, as a pointed cone or with respect to the ultra sound transducer ⁇ obliquely oriented surface is configured.
- the covering device can be designed with the displacement element as an additional component for a measuring tube. Accordingly, the invention also individually provides the cover device for the level measuring device designed in this way.
- This cover can therefore be configured as a lid or cap for the measuring tube.
- the cover device is thus designed as a cover element for placement on a pipe end of a measuring tube of the level measuring device, the cover device having a top wall for covering or closing the pipe end.
- this ceiling wall has the displacement element or is configured as such, which therefore projects into the end region of the measuring tube adjoining the pipe end in the state of the covering device placed on the pipe end.
- the level measuring device is designed in particular for a motor vehicle in order to determine a level of a fuel tank or an oil tank or other liquid container in the manner described.
- FIG. 1 shows a schematic representation of an embodiment of the fill level measuring device according to the invention in the installed state
- Fig. 2 is schematic representation of a longitudinal section of an end portion of a measuring tube of the level measuring ⁇ device of FIG. 1;
- Fig. 3 is a schematic representation of a cross section of the
- FIG. 4 shows a schematic illustration of a longitudinal section of a covering device of the level measuring device of FIG. 1; 5 shows schematic representations of longitudinal sections of possible displacement elements which may be provided in the end region of the measuring tube by the covering device.
- the exemplary embodiment explained below is a preferred embodiment of the invention.
- the described components of the embodiment each represent individual features of the invention that are to be considered independently of one another, which also each independently further develop the invention and thus also individually or in a different combination than the one shown as part of the invention.
- the described embodiment can also be supplemented by further features of the invention already described.
- Fig. 1 shows symbolizes a motor vehicle 10, in which a tank or container 11 may be 12 for a liquid.
- the liquid 12 may be, for example, a fuel or an oil or water.
- a level measuring device 14 may be provided in the container 11, which may have a tube system 15 that may have one or more coaxial tubes which the liquid 12 can flow in, for example through a lower inlet opening 16.
- the level measuring device 14 may further comprise an ultrasonic transducer 17, which may be controlled by a control device 18.
- the control device 18 can have, for example, a microcontroller or microprocessor.
- the ultrasonic transducer 17 may be formed, for example, on the basis of a piezoelectric element.
- the control device 18 a Blast ultrasound into the pipe system 15.
- In the pipe system 15 is a liquid surface of the liquid in the pipe system 15 12 produces an echo which can be detected by means of the ultra sound transducer ⁇ 17th Based on the running time can be determined by the controller 18 of the level 13. For arranging the level measuring device 14 in the container 11, this can in a container bottom 19 a
- FIG. 2 shows a longitudinal section, which is indicated in Fig. 1 by II and passes through a central axis or tube axis or longitudinal axis 22 of the tubes of the pipe system 15.
- FIG. 3 illustrates a cross section which is formed perpendicular to the longitudinal axis 22 and whose course of the sectional axis III in FIG. 1 is shown schematically.
- the pipe system 15 may have a measuring tube 23 and an outer tube 24 arranged coaxially therewith.
- An upper edge or an upper tube end 25 of flow tube 23 may be closed by a covering ⁇ device 26, that is, for example, a lid or end wall of the measuring tube 23.
- the cover 26 may in this case restriction member has a projection or extension, or a positive displacement comprise 27, which protrudes into the measuring tube 23.
- the region of the measuring tube 23 penetrated along the longitudinal axis 22 by the displacement element 27 constitutes an edge region or end region 25 ⁇ of the measuring tube 23.
- a vent 29 is provided which flow the air 28 along a Strö ⁇ tion direction 30 from the measuring tube 23 into the outer tube 24 can.
- the outer tube 24 Located opposite the vent opening 29 of the measuring tube 23, the outer tube 24 can have a further vent opening 31, through which the air can flow out of the outer tube 24 into an environment 33 of the level measuring device 14 along a flow direction 32.
- the offset angle measured with respect to the longitudinal axis 22 is 180 degrees (arrangement opposite) in the example shown.
- the displacement element 27 prevents an air bubble of the air 28 is included in the measuring tube 23 with increasing level 13.
- the displacement element 27 can ensure or cause by a wetting effect or capillary effect that in the illustrated in Fig. 2, first in a region 29 opposite the vent opening 34, the air 28 located there is urged towards the vent opening 29 and only then with increasing liquid ⁇ keits-level suppressed in a region 35 at the vent hole 29, the air located there, the measuring tube 23, or is discharged.
- the displacement element 27 is a clear cross section 36, in which the air 28 can collect in the end portion 25 ⁇ of the measuring tube 23, smaller than in the underlying portion of the measuring tube 23 itself, where the cross section 37 is defined by the entire inner diameter of the measuring tube 23 (see Fig. 3).
- the displacement element 27 may, starting from the pipe end 25 have a penetration depth 38 into the measuring tube 23, which is at most five times compared to a distance 39 of a lower edge 40 of the vent opening 29 from the pipe end 25, so that the measurement of the level 13 at a lower level of 13 the displacement element 27 is unimpaired.
- the lower edge 40 is the edge of the vent ⁇ opening 29 facing away from the tube end 25.
- FIG. 2 further illustrates how ultrasound U can be emitted through the ultrasound transducer 17 into the measuring tube 23 along the longitudinal axis 22 and an echo U x of the ultrasound U back can get to the ultrasonic transducer 17.
- 4 illustrates how the covering device 26 with the displacement element 27 can be provided by a cover element which can be placed or mounted on the measuring tube 23.
- a top wall 41 of the cover element may be dented in such a way that the displacement element 27 results.
- it may be configured in the manner illustrated in FIG. 2 as a solid injection molded part.
- the cover 26 may also be configured as part of the wall of the measuring tube 23 itself.
- FIG. 5 illustrates how different shapes A, B, C, D, E, F of the displacement element 27 can affect the course of the echo of the ultrasonic signal on the one hand and the guidance or displacement of the air 28 on the other hand.
- the views of the longitudinal sections show various, ⁇ playable geometries that may be provided at the upper end of the tube 25 of the measuring tube 23: A cone, B hemisphere, C Ke stump, E cylinder with oblique bottom / front side, E and F oblique cone with different Orientation relative to the vent 29.
- there is no significant difference between a conical shape and a pyramid shape (whether square base or other page number, eg 3, 6 or 8 sides), neither functional nor in manufacture.
- the displacement element 27 can thus also be configured in the shape of a pyramid or truncated pyramid.
- the shapes A, B, C are symmetrical with respect to the longitudinal axis 22, while the shapes D, E, F are asymmetrical with respect to the longitudinal axis 22.
- the displacement behavior can be adjusted.
- the example shows how an inclusion of an air bubble in a measuring tube of a level measuring device can be avoided by the invention.
Landscapes
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Electromagnetism (AREA)
- Thermal Sciences (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102016217926.8A DE102016217926A1 (de) | 2016-09-19 | 2016-09-19 | Füllstandsmessvorrichtung mit einem Messrohr und Abdeckvorrichtung für die Füllstandsmessvorrichtung |
| PCT/EP2017/073405 WO2018050880A1 (de) | 2016-09-19 | 2017-09-18 | Füllstandsmessvorrichtung mit einem messrohr und abdeckvorrichtung für die füllstandsmessvorrichtung |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP3516347A1 true EP3516347A1 (de) | 2019-07-31 |
Family
ID=59887286
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP17768129.3A Withdrawn EP3516347A1 (de) | 2016-09-19 | 2017-09-18 | Füllstandsmessvorrichtung mit einem messrohr und abdeckvorrichtung für die füllstandsmessvorrichtung |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP3516347A1 (de) |
| CN (1) | CN109891202A (de) |
| DE (1) | DE102016217926A1 (de) |
| WO (1) | WO2018050880A1 (de) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102020108718A1 (de) | 2020-03-30 | 2021-09-30 | Bayerische Motoren Werke Aktiengesellschaft | Betriebsmittelbehälter und Betriebsmittelversorgungssystem |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1387672A (en) * | 1971-08-09 | 1975-03-19 | Ulrich H | Liquid level indicators |
Family Cites Families (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4703653A (en) * | 1985-12-02 | 1987-11-03 | Fluidmaster, Inc. | Ballcock float structure |
| JPS63165720A (ja) * | 1986-12-26 | 1988-07-09 | Fujitsu Ltd | 液面レベル警報器付液体貯蔵タンク |
| JPH10318539A (ja) * | 1997-05-20 | 1998-12-04 | Tokai:Kk | 液体燃料用燃焼器具 |
| CN1276170C (zh) * | 2003-02-14 | 2006-09-20 | 雅马哈发动机株式会社 | 发动机的油位检测装置 |
| US7721600B1 (en) | 2006-03-17 | 2010-05-25 | Eastech Flow Controls, Inc. | Flow measurement apparatus and method |
| US20090301187A1 (en) * | 2006-07-18 | 2009-12-10 | Conti Temic Microelectronic Gmbh | Multichamber ultrasonic sensor for determining a liquid level |
| DE102009023211B4 (de) | 2009-05-29 | 2021-09-16 | HELLA GmbH & Co. KGaA | Dämpfungsbecher |
| US8336385B1 (en) * | 2010-03-11 | 2012-12-25 | S.J. Electro Systems, Inc. | Pressure sensor diaphragm system |
| CN201688875U (zh) * | 2010-06-08 | 2010-12-29 | 江苏省农业科学院 | 一种微量气体计量仪 |
| DE102011087981A1 (de) * | 2011-12-08 | 2013-06-13 | Continental Automotive Gmbh | Füllstandssensor zur Erfassung des Füllstands einer Flüssigkeit in einem Behälter |
| US8919194B2 (en) | 2012-09-05 | 2014-12-30 | Simmonds Precision Products, Inc. | Liquid level gauging system with bubble shedding reflectors |
| CN203274850U (zh) * | 2013-04-26 | 2013-11-06 | 四川科强电子技术有限责任公司 | 一种有排污槽的电容式液位传感器 |
| DE102013016164B4 (de) * | 2013-09-30 | 2023-06-15 | HELLA GmbH & Co. KGaA | Vorrichtung zur Bestimmung eines Füllstands sowie Motor und Kraftfahrzeug mit einer derartigen Vorrichtung |
-
2016
- 2016-09-19 DE DE102016217926.8A patent/DE102016217926A1/de not_active Withdrawn
-
2017
- 2017-09-18 EP EP17768129.3A patent/EP3516347A1/de not_active Withdrawn
- 2017-09-18 WO PCT/EP2017/073405 patent/WO2018050880A1/de not_active Ceased
- 2017-09-18 CN CN201780057691.0A patent/CN109891202A/zh active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1387672A (en) * | 1971-08-09 | 1975-03-19 | Ulrich H | Liquid level indicators |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102016217926A1 (de) | 2018-03-22 |
| CN109891202A (zh) | 2019-06-14 |
| WO2018050880A1 (de) | 2018-03-22 |
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