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
  • G01F23/64—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 of the free float type without mechanical transmission elements
  • G01F23/72—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 of the free float type without mechanical transmission elements using magnetically actuated indicating means

Definitions

• Another system is to make a hole in the bottom of the container and attach a union elbow, which may also have a tap; a transparent pipe made of glass or plastic is connected to the union, and the pipe is raised vertically outside the tank, up to the top thereof.
• a union elbow which may also have a tap
• a transparent pipe made of glass or plastic is connected to the union, and the pipe is raised vertically outside the tank, up to the top thereof.
• the magnet To make the magnet float on the level of the liquid, it will be enough to put it in a float chamber whose volume has been calculated and which will be able to float, carrying the magnet and possibly some ballast to balance the weight of the magnet which will be located in the float chamber.
• the float chamber will have to have thin walls at the point where the magnet rests and will have to be made of a material which is not sensitive to the magnetic flux.
• Variations in the level of the liquid in the tank will also entail movements of the float chamber floating inside, and therefore of the magnet; and outside the container the spherical body made of light latten will also be displaced on the wall.
• the fly When it has been attracted by the magnet, the fly will follow the movements thereof from the outside, and will also hold the magnet as close as possible and therefore also as close as possible to the inner wall of the tank (unless the liquid undergoes strong turbulence or mixing) . If the float chamber with the magnet, inside the tank, does not have a guide, its movements on the level of the liquid can be not only vertical but also horizontal and it can then happen that the fly, even though it may still be on - 4 -
• Fig. 1 shows a tank for liquids provided with the device according to the invention
• Fig. 2 shows an enlarged, sectioned detail of the device according to the invention
• Fig. 3 shows a first variant of the device according to the invention
• Fig. 4 shows an enlarged, sectioned detail of the device shown in Fig . 3
• Fig. 5 shows a second variant of the device according to the invention.
• Fig. 1 shows a tank 1 with a liquid 2 inside which arrives about half-way up the tank; a float chamber 3 floats on the liquid 2 and carries a permanent magnet 4 inside; at the bottom of the float chamber there is some ballast 5.
• the float chamber 3 can move up and down, and vice versa, with the level of the liquid 2, guided by a rod 7 attached vertically inside the tank 1. - 5 -
• a spherical element 8 of ferromagnetic material which will indicate the position of the permanent magnet 4 and, since it is floating on the liquid 2, it will also indicate the level of the liquid 2 itself .
• the device according to the invention can comprise a guide rod 7 for the float chamber 3 and an elastic element 6 or feather, suitable to hold the float chamber 3 adherent to the inner wall of the tank.
• the vertical guide 7 is arranged inside the tank 1.
• the guide 7, which is a rod which can have different sections according to how the float chamber 3 has to be constrained, vertically breaks the smooth inner surface of the tank 1 and for this reason may sometimes cause a problem.
• the guide will be welded vertically outside the tank and will consist of a band or strip 9 of ferrous material sensitive to magnetic flux.
• the float chamber 3 containing the permanent magnet 4 rests on the liquid 2, and is directed into the zone where, on the outside, the vertical band or strip 9 made of ferrous material is positioned.
• the strip 9 can be applied on the tank after it has been made, or it can be incorporated in the outer wall thereof when the tank is actually manufactured.
• the permanent magnet 4 perceives the presence of the ferrous material and is attracted in correspondence with the strip 9.
• the outer ferrous guide 9 will absorb part of the magnetic flux, but there will always be a residual part to attract the element 8 onto the wall and keep it there; since this element 8 is free to move, it will follow the displacement, up or down, of the permanent magnet 4 and will therefore indicate the level of the liquid 2 inside the tank 1.
• the magnet in order to be able to slide along the wall of the tank 1, the magnet will have to have a wheel shape 10 (Fig. 5), because it would not be able to slide if it were of another shape, since it is strongly attracted by the ferrous material .
• the magnet 10 and the float chamber 3 will thus take on the approximate shape of a wheelbarrow.
• This shape of the magnet 10, like a wheel, can also be used on any tank 1.
• the difference between the inner guide 7 and the outer guide 9 is that the first must be made of non-magnetic material, while the second, in order to fulfil its function as a guide, must be made of ferromagnetic material so as to be able to attract the permanent magnet 4 located inside the tank and to keep it attracted.
• the permanent magnet 4 need not necessarily be located inside the float chamber 3; it may also be located on the level of the liquid 2 in another manner, such as for example, in the case of "ever full” tanks, it can be anchored to the floating cover and will thus follow the level of the liquid 2.
• the flux emitted by the permanent magnet 4, apart from attracting the element 8, may be used to act on a icro- switch, for a light or bell, of a known type and which is not shown in the drawings .

Landscapes

• Physics & Mathematics (AREA)
• Fluid Mechanics (AREA)
• General Physics & Mathematics (AREA)
• Level Indicators Using A Float (AREA)
• Control Of El Displays (AREA)
• Devices For Indicating Variable Information By Combining Individual Elements (AREA)
• Amplifiers (AREA)

Applications Claiming Priority (3)

Publications (1)

Family

ID=11422606

Family Applications (1)

Country Status (4)

Families Citing this family (3)

Family Cites Families (3)

• 1998
  • 1998-03-11 IT IT98UD000038A patent/IT1299752B1/it active IP Right Grant
• 1999
  • 1999-03-08 EP EP99905129A patent/EP1062484A1/en not_active Withdrawn
  • 1999-03-08 WO PCT/IB1999/000384 patent/WO1999046567A1/en not_active Application Discontinuation
  • 1999-03-08 AU AU25414/99A patent/AU2541499A/en not_active Abandoned

Non-Patent Citations (1)

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