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
  • G01F23/36—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 electrically actuated indicating means
  • G01F23/363—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 electrically actuated indicating means using electromechanically actuated indicating means

Definitions

• the invention relates to a level sensor for a
• Fuel tanks are bent to compensate for assembly tolerances.
• a disadvantage of the known level sensor is that a burr at the end of the angling of the lever wire can damage the bores of the bracket and the carrier, so that the movement of the float deviates from a circular path.
• the free end of the bend must be deburred.
• the angle of the bend is usually only 89 ° or less instead of 90 ° in order to generate a preload on the bearing. Preloading the bearing enables little play. This however also leads to a deviation of the movement of the float from a circular path.
• the level sensor is therefore very difficult to calculate and calibrate.
• the invention is based on the problem of developing a level sensor of the type mentioned at the outset in such a way that it can be manufactured and calibrated as inexpensively as possible.
• the bracket is mounted on the carrier regardless of the assembly of the lever wire. Therefore a burr at the end of the lever wire does not damage the bearing of the lever arm. Since the bracket wire is not affected by the lever wire, it can be particularly flat and short. Deburring of the lever wire can be avoided thanks to the invention.
• the angle provided for fastening the lever wire to the carrier can also be 90 °, which leads to an easy-to-calculate circular arc of the movement of the float.
• the bracket and the carrier can each be manufactured with a high degree of accuracy from plastic, which enables the level sensor according to the invention to be easily calibrated.
• the introduction of vibrations and fluctuations of the float into the signal transmitter can be kept particularly low according to an advantageous development of the invention if the bracket has two legs protruding from the bearing and if the free end of the lever wire is arranged on a first leg and the second leg is designed to control the signal generator. Lifting of sliding contacts of a signal transmitter designed as a potentiometer from sliding tracks is thus avoided.
• Another advantage of this design is that the arrangement of the sig- nalgebers on the carrier can be freely selected by an appropriate angling of the legs regardless of the pivoting range of the lever wire. This simplifies the calculation and calibration of the level sensor.
• the signal transmitter can be, for example, a magnetically active position sensor or a potentiometer.
• the lever wire can be easily attached to the bracket if an angled portion of the free end of the lever wire penetrates into a recess in the first leg of the bracket and if the recess is arranged at the end facing away from the bracket mounting.
• a vibration damper is arranged in the recess. This enables at least a slight relative movement of the lever wire relative to the bracket. This prevents vibrations or slight fluctuations in the lever wire from being introduced into the bracket and influencing the signal transmitter. Such vibrations or fluctuations often lead to a lifting of sliding contacts of the signal transmitter designed as a potentiometer. In the case of signal transmitters designed as magnetically active position sensors, fluctuations in the distance of a magnet above a thick-film measuring mechanism are thereby reduced.
• a second vibration tion damper is arranged on a section of the first leg of the bracket which is guided in parallel with the lever wire.
• FIG. 1 shows a fill level sensor according to the invention fastened on a wall
• FIG. 2 shows a sectional view through the wall from FIG. 1 with the fill level sensor according to the invention
• FIG. 1 shows a level sensor 2 mounted on a vertical wall 1 within a fuel tank.
• the level sensor 2 has a float 4 attached to a lever arm 3.
• the lever arm 3 is pivotably mounted on a support 6 with a bracket 5 made of plastic and has one The lever wire 7 fastened to the bracket 5 for holding the float 4.
• the float 4 follows a fuel level in the fuel tank and pivots the lever arm 3.
• the pivoting angle of the lever arm 3 is detected by a signal transmitter 8 designed as a potentiometer.
• the signal generator 8 has two sliding tracks 9 arranged on the carrier 6 and a sliding contact 10 fastened to the bracket 5.
• the sliding contact 10 is designed as a double contact for bridging the sliding tracks 9 and is resiliently biased against them.
• the bracket 5 has a bearing 11 with a bearing axis running perpendicular to the plane of the drawing.
• Two legs 12, 13 of the bracket 5 lead away from the bearing 11.
• a first leg 12 is connected to the lever wire 7, while the second leg 13 holds the sliding contact 10 on the side of the carrier 6 facing away from the lever wire 7.
• An angled portion 14 of the lever wire 7 is inserted into a recess 15 in the first leg 12.
• the first leg has 12 a clip connection 16 with two vibration dampers 17 for holding the lever wire 7.
• FIG. 2 shows in a sectional view through the wall 1 and the fill level sensor 2 from FIG. 1 along the line II-II that the bearing 11 has a bearing pin 18 pressed into the bracket 5 and penetrating the carrier 6.
• the bearing pin 18 can be made of metal.

Landscapes

• Physics & Mathematics (AREA)
• Fluid Mechanics (AREA)
• General Physics & Mathematics (AREA)
• Level Indicators Using A Float (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=33103497

Family Applications (1)

Country Status (6)

Families Citing this family (6)

Family Cites Families (15)

• 2003
  • 2003-04-16 DE DE10317809A patent/DE10317809A1/de not_active Ceased
• 2004
  • 2004-03-17 JP JP2006500065A patent/JP4109306B2/ja not_active Expired - Fee Related
  • 2004-03-17 WO PCT/EP2004/002780 patent/WO2004092691A2/de active Application Filing
  • 2004-03-17 CN CNB2004800101030A patent/CN100370233C/zh not_active Expired - Fee Related
  • 2004-03-17 US US10/552,924 patent/US7251999B2/en not_active Expired - Lifetime
  • 2004-03-17 EP EP04721182A patent/EP1613931A2/de not_active Withdrawn

Non-Patent Citations (1)

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