Gas separation: apparatus – Magnetic separating means
Patent
1998-06-23
2000-06-20
Smith, Duane S.
Gas separation: apparatus
Magnetic separating means
95 28, 210222, 210695, B01D 3506
Patent
active
060773332
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a device for removing magnetizable parts from a liquid, dry substance or gas, comprising a housing which defines a space through which the substance to be treated or the gas can be passed, as well as at least one magnet whose magnetic field extends into the space in order to attract magnetizable parts contained in the substance or the gas, each magnet being situated in a magnet holder which has an interface with the space.
2. Description of the Related Art
Such devices are known, e.g. from GB-A-850233, U.S. Pat. No. 5,043,063 and WO-A-8705536. They are commonly used in those fields in which the presence of iron particles in liquids is very undesirable, as in the application of paint in the automobile industry. In particular, in the case of the priming coat to be applied first to the metal, very high requirements have to be met since any iron particles give rise to rust formation.
According to these known devices, the magnetizable material accumulates on the outside of the magnet holder, as a result of which it is no longer necessary to clean the magnet itself. In addition, as a result of removing the magnet, the magnetic field in the liquid space is removed so that the magnet holder can be cleaned in quite a simple manner.
SUMMARY OF THE INVENTION
However, despite the removal of the magnets, iron particles may still, nevertheless, remain behind on the holder wall. The aim of the invention is to provide a device by means of which the metallic particles can be removed reliably. This aim is achieved in that a sprinkling or spraying member for cleaning the outside of each tube is situated near the top of each tube. Said sprinkling or spraying member may comprise an annular pipe provided with a plurality of sprinkling or spraying nozzles which can be fed with a fluid, such as a liquid or gas.
Each magnet holder may comprise, for example, a tube which is sealed at its end projecting into the housing and is attached at its other end to the top wall. In that case, a rod-shaped magnet is provided which is received in the tube with little clearance and with an air gap being left free.
The housing has a top wall from which each tube extends downwards into the liquid space. In order, nevertheless, to be able to manipulate the magnets easily despite the strong magnetic field, they are each attached to a yoke which can be moved up and down by means of two or more piston-and-cylinder devices.
When the magnets are raised out of their holder, the magnetic field decreases considerably at the position of the liquid space, as a result of which the material accumulated on the outside of the holders can easily be removed. In order to ensure that the material does not enter the cleaned liquid again, the bottom wall of the holder (filter housing) is provided with a discharge for removing magnetizable parts which accumulate on the outside of each tube.
The nozzles can be sited in various ways. According to a first possibility, the nozzles are situated near the top of the tubes, and are directed downwards along the tubes. In this case, the annular pipe may be situated outside the space for the substance to be treated, and the nozzles or their feed pipe routed through the holder wall, such as the lid.
This design is suitable, in particular, for larger versions of the device. The nozzles may, nevertheless, be sited at a small distance from the tubes via the lid, as a result of which the cleaning effect is excellent.
As an alternative, the nozzles can be directed horizontally towards the tubes. In this case, the annular pipe may also be situated in the holder.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will be explained in greater detail below by reference to an exemplary embodiment shown in the figures.
FIG. 1 shows a vertical view, partly in cross section, of the device according to the invention in the operating state.
FIG. 2 shows a view as in FIG. 1, in the cleaning state.
FIG. 3 shows a plan view of the device according to the invention.
F
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