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
  • G01F23/30—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 floats
  • G01F23/32—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 floats using rotatable arms or other pivotable transmission elements
  • G01F23/38—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 floats using rotatable arms or other pivotable transmission elements using magnetically actuated indicating means
• • 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
  • G01F23/30—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 floats
  • G01F23/32—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 floats using rotatable arms or other pivotable transmission elements

Definitions

• Measuring device for filling level of a container The present invention relates to measuring a level in a
• the invention relates to a measuring device for measuring a level based on a magnetic measuring principle.
• Level gauges are used in many different areas of technology.
• measuring devices can be used, for example, the various liquid levels, such as fuel, coolant, brake fluid or the like, measure.
• the various liquid levels such as fuel, coolant, brake fluid or the like.
• Measurement of levels with low measurement tolerances may be necessary.
• a large number of different requirements can be made of such measuring devices for the technical realization.
• Knife teas are required.
• measuring sensors are known from the prior art in which a change in a level causes rotation of a magnetic element. This change in an angular position of a
• Magnetic element causes a change in an electrical
• a measuring arm connected to, for example, a float element is often designed in the form of a metallic shaft or a metallic pin, which is guided via a bearing into an inner region of a housing and over an entire width of a sensor housing to, for example, one
• the magnetic element is often arranged directly on the measuring arm or on the shaft, wherein the magnetic element rotates together with the measuring arm or the shaft when changing a level.
• the spatial change of the position of the magnetic element generates a change in the magnetic field generated by the magnetic element. This change is detected by a magnetically sensitive element and the corresponding electrical measurement signals are generated.
• the magnetically sensitive element is often arranged outside the axis of rotation of the measuring arm, for example radially spaced from the magnetic element. This non-axial arrangement of magnetic element and
• magnetically sensitive element can compromise on accuracy
• Magnetic element may be arranged for example at one end of the measuring arm or at one end of the shaft. This arrangement is often referred to as end-of-shaft arrangement. For this it is necessary, however, that the
• Magnet element depending on the level together with the measuring arm can perform a rotational movement, wherein the magneto-sensitive sensor is fixedly connected as a reference, for example, with a sensor housing. It is in such solutions, the measuring arm in a single camp in
• a measuring device for measuring a level of a container having a measuring arm, which is designed to change its angular position about an axis of rotation as a function of the filling level.
• the measuring arm has at its first end a float element and at a second end a magnetic element, wherein the magnetic element is rotatably connected to the measuring arm. Furthermore, a magnetically sensitive element is provided, which is executed, depending on the
• the measuring device has a first bearing in which the measuring arm is rotatably mounted.
• the measuring device is characterized in that a second bearing is provided, in which the measuring arm is rotatably mounted, wherein the
• Magnetic element of the measuring arm is arranged in a space between the first bearing and the second bearing.
• a measuring arm can be, for example, a rigid shaft or a rigid wire.
• the measuring arm may have a plurality of subregions which are in an angular arrangement to one another.
• the part of the measuring arm that extends from the surface of the liquid to the housing, opposite to a portion of the measuring arm, which projects into the housing be arranged at an angle to each other.
• the measuring arm is made of a preferably rigid metal wire.
• the first bearing and the second bearing are provided on a housing.
• a housing Under a housing can be understood, for example, a plastic existing support body.
• the housing can be designed, for example, rigid, in order to achieve a mechanical stability against environmental influences and mechanical stress.
• the bearing provided, for example, in one side of the housing may, in one example, be a bore with the cross section approximately equal to or slightly larger than a cross section of the measuring arm.
• the bearing may additionally include a bearing sleeve or other suitable additional
• the first end of the measuring arm can become
• a liquid level of the container for example, at the level of a liquid level of the container.
• a made of plastic and filled with air for example, a made of plastic and filled with air
• a rotationally fixed connection of the magnetic element to the measuring arm can be realized in various ways.
• the magnetic element at the level of its central axis can be fixed directly against rotation on the end of the measuring arm opposite the float element.
• the magnetic element is connected to the measuring arm via a third material, for example, to minimize undesirable magnetic effects resulting from magnetic properties of the magnetic element in conjunction with the magnetic element could yield magnetic properties of a metallic measuring arm, for example.
• the generated electrical signals can then be further processed by, for example, an evaluation unit.
• the connection of the magnetically sensitive element with the housing can serve to provide a fixed local reference position relative to the rotatably mounted magnetic element, thus changing the position of the
• a measurement signal can be understood as an electrical voltage and / or electrical current which is dependent, for example, on the angular position of the magnetic element. Also signals are possible, which is a strength of
• the measuring arm can be indirectly rotatably mounted in the second bearing, for example by means of a connecting piece.
• Measuring arm allows. This allows the magnetically sensitive element
• the measuring device has a local
• Magnetic sensitive element is formed.
• the magnetically sensitive element is provided to the second bearing. According to one embodiment of the invention is on the measuring arm
• the measuring arm is rotatably connected to the connector.
• a torsional strength describes a direct mechanical coupling between the connecting piece and the measuring arm during a rotation of the measuring arm.
• the connector is at the level of the axis of rotation of
• the connector is curved. A second end of the connector can
• the connector is curved.
• An advantage may be seen in that, by a curvature of the connector, a spatial bypass of the gap may be achieved instead of a direct connection.
• the connector can assume different geometric shapes.
• the connector can thereby create the gap in the region of the axis of rotation, which can accommodate the magnetic element and the magneto-sensitive element and at the same time enables a force-based support of the measuring arm at the level of the axis of rotation.
• the connector bridges a distance between the magnetic element and the magnetically sensitive element in order to use a bearing arranged in this region for additional support of the measuring arm.
• the connector has a U-shaped configuration in a cross-section parallel to the axis of rotation.
• the U-shaped configuration of the connecting piece may be a special embodiment of the curved shape of the connecting piece be seen.
• the connector can be constructed symmetrically U-shaped.
• the connector has a
• the measuring arm extends through the recess of the connecting piece in the first section.
• the measuring arm has a first area and a second area, the first area including an angle with the second area.
• a stabilizing element is at one end with the
• Angular position of the measuring arm is reduced.
• An advantage can be seen in that a level-related angular change in the form of a mostly vertical movement, for example of the float element, can be converted into a horizontal rotational movement of the measuring arm.
• Stabilizing element in this case has a support function, the like
• the stabilizing element may be designed as part of the connecting piece or integrally or integrally with the connecting piece.
• the housing has a
• the measuring arm comprises a metal or a metal alloy. An advantage can be seen inter alia in increased stability and durability with relatively low weight of the measuring arm.
• the measuring arm may consist of a steel wire or a steel profile.
• a round cross-sectional shape of the measuring arm can be advantageous.
• the bearing surface of the first and / or second bearing comprises a metal.
• the measuring arm is made of a metallic material and the first and second bearings have metallic bearing surfaces.
• the materials of the first bearing and the second bearing may be different.
• the first bearing is one
• the second bearing is made of a metal.
• the connector has a plastic.
• Magnetically sensitive element can be realized.
• the magnetosensitive element is a Hall effect sensor.
• the so-called Hall effect is used to measure magnetic fields.
• an output voltage is generated by the sensor, for example, proportional to the product of magnetic
• the magnetic element is arranged in or on the connector. In other words, the
• Measuring arm or the end of the measuring arm spatially spaced from the
• the magnetic element may be surrounded by the connecting piece such that a magnetic interaction between the measuring arm and the magnetic element is minimized.
• the magnetic element may be cast in a plastic connector, and the connector is in turn connected to the measuring arm over a spatial distance.
• the measuring arm can be non-rotatably connected to the magnetic element without direct mechanical contact between the measuring arm and the magnetic element.
• Fig. 1A shows a schematic structure of a measuring device according to the invention.
• Fig. 1B schematically shows an alternative construction of a measuring device according to the invention.
• FIG. 2 shows a simplified sectional view of a measuring device according to the invention for measuring a filling level of a container.
• FIG. 1A shows, in a simplified manner, a measuring device 10 for measuring a filling level of a liquid surface 20, for example in a container.
• the measuring device 10 has a measuring arm 12 with a first region 14 and a second region 16.
• the second region 16 of the measuring arm 12 protrudes in the direction of the liquid surface 20. At the far end of the second
• Region 16 of the measuring arm 12 can this example, a
• Float element 18 may be attached, which is a coupling between a height of the liquid surface 20 and a deflection movement of the second
• Range 16 of the measuring arm 12 establishes.
• Liquid surface 20 a movement of the float member 18 is generated, which triggers an angular movement of the second portion 16 of the measuring arm 12.
• the first region 14 of the measuring arm encloses an angle, for example of 90 °, with the second region 16 of the measuring arm 12.
• the first region 14 of the measuring arm 12 is rotatably mounted in a first bearing 22.
• the measuring arm 12 has a magnetic element 24 in its first region 14.
• the magnetic element 24 is rotatably connected to the end of the first portion 14 of the measuring arm 12, so that at a
• Magnetic element 24 takes place. This rotation of the magnetic element 24 is detected by a magnetically sensitive element 26 caused by a change in the magnetic field in the vicinity of the magnetic element 24.
• the magnetically sensitive element 26 thereby generates electrical signals 27, which can be further processed, for example, by a connected evaluation unit (not shown).
• the magnetically sensitive sensor 26 is firmly connected to a housing 28.
• the housing 28 has in the example shown here on a first side 30 of the housing 28, which is a second side 32 of the housing 28th
• the housing 28 forms, with its first side 30 and its second side 32, a gap 34 or a chamber.
• Interspace 34 are the magnetic element 24 and the magnetically sensitive
• the housing 28 has in its construction and by Material a stable, rigid shape. This serves as a support function or
• the first bearing 22 is arranged on the first side 30 of the housing 28, so that the first region 14 of the measuring arm 12 is rotatably mounted. In this way, the end of the first region 14 of the measuring arm 12, to which the magnetic element 24 is attached, is arranged in the intermediate space 34. A second end of the first portion 14 of the measuring arm 12, which is connected to the second portion 16 of the measuring arm 12, is located outside the gap
• second bearing 36 is arranged.
• This second bearing 36 forms with the first bearing 22 a common axis of rotation 38.
• a connecting piece 40 is provided for receiving the supporting forces, which at a first end 42 of the connecting piece 40 is non-rotatably connected to the first region 14 of the measuring arm 12. With a second end 44, the connecting piece 40 is supported in the second bearing 36.
• the connecting piece 40 is curved or U-shaped to spatially bypass the area of the magnetic element 24 and the magnetically sensitive element 26 and a second, from the first bearing by supporting the second end 44 of the connecting piece 40 in the second bearing 36 22 spatially spaced bearing point to
• the second end 44 of the connecting piece 40 has an end region which extends in its extension on the axis of rotation 38 and is mounted in the bearing 36.
• FIG. 1B shows an example of a measuring device 10, which shows an alternative construction variant of the measuring device 10 according to the invention.
• the measuring device 10 shown in this example is similar to the example shown in Fig. 1A.
• the connector 40 is supported on a lateral surface in the bearing 36 from. Furthermore, in the example shown in FIG. 1B
• FIG. 2 shows another embodiment of a measuring device for measuring a level of a container.
• a measuring arm 12 has a 90 °
• a magnetic element 24 is of a
• connector 40 Surrounding connector 40 and is supported by this. This can be achieved for example by pouring or gluing the magnetic element 24 in the connector 40.
• One end of the first area 14 of the connector 40 is provided.
• Measuring arm 12 is rotatably connected to the connecting piece 40 in the region of
• the connecting piece 40 has an approximately U-shaped form and is supported at its second end 44 in a second bearing 36 on an outer side of the second side 32 of the housing 28. This will between the
• a magnetically sensitive element 26 is arranged on or in the second side 32 of the housing 28 in the region and at the level of the axis of rotation 38.
• the magnetically sensitive element 26 may, for example, be a sensor based on the Hall effect.
• a center of the magnetically sensitive element 26 may, for example, be a sensor based on the Hall effect. For example, a center of the
• Magnetic sensitive element 26 a magnetic center of the
• the connecting piece 40 has a third section 50, which in the example shown here is connected to the measuring arm 12 and, for example, may have the stabilizing element 48.
• a second section 54 serves to mount the connecting piece 40 on the second bearing 36.
• Connector 40 has a recess 56 in the region of the first bearing 22.
• the recess 56 is dimensioned so that it surrounds the bearing 22 at a distance.
• the housing 28 is made of a plastic.
• the bearing surface of the first bearing 22 and / or the second bearing 36 comprises a metal.
• this metal sleeves may be mounted inside the bearing, for example, to be able to use various materials for the bearing surfaces and the housing 28.
• the second bearing 36 has a metal on its housing-side bearing surfaces and the connecting piece 40 is, for example in the region of the bearing, from made of a plastic.
• the connecting piece 40 is, for example in the region of the bearing, from made of a plastic.
• Connector 40 in the region of the first bearing 22 and / or in the region of the second bearing 36 on a different material than in the remaining region of the connecting piece 40 may be advantageous to achieve lower tolerances and longer durability in the field of bearings by, for example, harder materials ,

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• Physics & Mathematics (AREA)
• Fluid Mechanics (AREA)
• General Physics & Mathematics (AREA)
• Level Indicators Using A Float (AREA)
• Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=51033156

Family Applications (1)

Country Status (5)

Families Citing this family (12)

Family Cites Families (39)

• 2013
  • 2013-07-31 DE DE102013215015.6A patent/DE102013215015A1/de not_active Withdrawn
• 2014
  • 2014-06-18 BR BR112016001740-4A patent/BR112016001740B1/pt not_active IP Right Cessation
  • 2014-06-18 US US14/908,529 patent/US9885598B2/en not_active Expired - Fee Related
  • 2014-06-18 EP EP14734045.9A patent/EP3028015A1/de not_active Withdrawn
  • 2014-06-18 WO PCT/EP2014/062796 patent/WO2015014534A1/de active Application Filing

Non-Patent Citations (1)

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