Liquid purification or separation – Magnetic – With additional separator
Patent
1983-10-25
1985-07-16
Adee, John
Liquid purification or separation
Magnetic
With additional separator
B03C 102
Patent
active
045295174
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an arrangement for separating out particles which are present in a liquid containing particles and particularly to an arrangement for the separation and removal of particles or objects, capable of attraction by magnetic fields, which are contained in the liquid. Examples of such particles and objects are magnetite, iron shavings, rust and the like.
The invention relates particularly to such arrangements where the liquid is guided so as to traverse a magnetic field produced by a magnet, the magnet being isolated from the liquid. However at least one body which distributes the magnetic field in the liquid is provided in or near the flow path of the liquid.
BACKGROUND
Several arrangements of the type described above are already known.
For the removal of objects made of magnetisable material such as metal shavings, rust flakes and the like from liquids, e.g. heat exchangers in steam boilers and in lubrication systems, the method is already known of using bodies contained in the liquid in the form of plugs made of permanent magnetic material. Here the plugs are so arranged that they project slightly into the flow path of the liquid, or are in a sump, and here create a magnetic field which attracts the magnetisable foreign bodies. Otherwise these would be entrained by the liquid in the liquid flow. Also other arrangements for this purpose are already known.
Thus mention can be made of the fact that by virtue of U.S. Pat. No. 2,798,611 the method is already known of providing two permanent magnets to the underside of an attraction surface and to locate both these magnets in a container.
In German patent specification as filed No. 1 012 87l the method is already known of utilising a number of bodies which distribute the magnetic field in the liquid and which interact with an electromagnet so that the liquid flows through and past a number of magnetisable discs. Here the electromagnetic unit forms one section whilst the container for cleaning the liquid forms the second section, the sections interacting with each other.
The method is already known from British patent specification No. 1 311 794 of cleaning liquid by allowing the liquid to traverse a narrow gap in connection with a strong magnetic field.
Finally it could be mentioned that arrangements of the relevant type are illustrated and described in Danish patent specification No. 82 001, U.S. Pat. No. 1,673,837 and Swedish patent specification No. 111 582.
DESCRIPTION OF THE INVENTION
Technical Problem
However technical problems are involved with the majority of the arrangements known hitherto. Particularly in the case of the plugs made of permanent magnetic material employed earlier, the strength of the magnetic fields is dependent on the size of the magnet and of the air gap. This signifies that relatively constricted flow paths for the liquid must be provided close to the magnet, so as to assure that all the attractable particles are separated out and adhere to the magnet.
With certain applications this involves a disadvantage. Obviously the passage of the liquid through the constricted flow path is rendered difficult by the fact that the particles or objects attracted by the magnetic field become stuck in the flow path and as a result give rise to a further constriction of the flow path.
It has also proved to be a disadvantage that permanent magnetic plugs are difficult to remove when particles and objects attracted by the magnetic field have collected on these. Furthermore it can be a problem to remove accumulated particles on the one hand from the plug and secondly from the immediate vicinity in the liquid container.
Hence it is a difficult technical problem within this technical field to create an arrangement for cleaning a liquid containing particles so as to remove particles in accordance with the conditions specified above where on the one hand the arrangement is simple and practical in design and secondly to ensure that the magnetic field which is to attract the particles does really extend
REFERENCES:
patent: 1673837 (1928-06-01), Lotz
patent: 2798611 (1957-07-01), Prevost
patent: 2800230 (1957-07-01), Thoma
patent: 4422935 (1983-12-01), Mattingly
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