Liquid purification or separation – Processes – Including controlling process in response to a sensed condition
Patent
1989-07-19
1991-10-01
Dawson, Robert A.
Liquid purification or separation
Processes
Including controlling process in response to a sensed condition
210106, 210110, 210139, 210388, 210408, 210741, 210742, 210785, 210797, C02F 136
Patent
active
050531417
DESCRIPTION:
BRIEF SUMMARY
The present invention concerns a procedure an a means for automatic filtering of liquid substances with a self-cleaning arrangement and possibly simultaneous homogenizing of the liquid that is being filtered. The procedure and means are based on using filter mesh elements, ultrasonics and compressed air.
In a liquid filtering event in which the liquid is passed through filter elements, the elements are soiled down and have to be replaced or cleaned. Since filter element replacing entails many detriments, e.g. the need to keep such elements in stock, the work involved in the replacement operation and possibly interruption of the filtering process, endeavours are generally aimed at performing doing the cleaning during operation if possible.
In the case of oils, for instance, cleaning during operation is usually implemented by conducting part of the flow which is being filtered back in reversed direction in an endeavour to achieve that the woven mesh, which is the type most often employed, will be flushed clean by the filtered liquid itself.
In the foregoing those natural drawbacks have already been described which arise from filter element replacing. The above-mentioned cleaning method during operation, based on reverse flow, also entails a number of drawbacks: the filters mesh fails to be completely cleaned in such a procedure. Secondly, the mesh may suffer damage from the pressure peaks induced by fuel supply pumps. Thirdly, when the liquid quantity required for reverse flushing is large, loss of time is incurred, and unnecessary twice-over purifying of the respective liquid quantity.
With the aid of the means of the invention quite significant improvement is achieved regarding the drawbacks mentioned, among others.
The most important advantages of the invention over other cleaning processes which take place during operation are to be seen in that by the procedure of the invention the filter elements will be more completely cleaned, the risk of damaging the filter mesh is prevented and reciprocating running of liquid is avoided.
The advantages gained as regards replacement of filter elements are obviously the same as those of cleaning during operation, which have already been discussed.
The invention is described in the following, referring in detail to the drawing attached, presenting an embodiment example of the invention. The invention is in no way narrowly confined to the details of said example.
FIG. 1a is an overall view of the invention.
FIG. 1b is a detail thereof.
As depicted in FIG. 1a, the means comprises two identical filter units 1 and 2, these units being alternately one in use and the other in its cleaning cycle, or on conclusion of the cycle in readiness for use, and a switch-over valve assembly 3 with actuating mechanism, and an ultrasonic generator 4.
A filter unit is composed of a filter body 1.1, a filter element 1.2 which is exchangeable according to operating meed, a filtering residue removal valve 1.3, a single-action pneumatic actuator 1.4, a pilot valve 1.5, a float chamber 1.6 for air venting, a float-operated switch 1.7, a shut off valve 1.8, a filling valve 1.9, a restriction 1.10, an ultrasonic oscillator 1.11, a compressed air flushing valve 1.12, a differential pressure switch or differential, pressure pick-up 1.13 and a control unit 5.
Equivalent components of filter unit 2 can be similarly identified as identical components, using reference numerals 2.1 to 2.13, component 2.1 being the equivalent of component 1.1 in filter unit 1, and so on.
The switch-over valve assembly consists of a switch-over valve 3.1 for pure liquid, a switch-over valve 3.2 for impure liquid, a pneumatic actuating means 3.3 common to the foregoing components 3.1 and 3.2, and a pilot valve 3.4 for governing the component 3.3.
It is assumed in the example illustrating the operation of the means that filter unit 1 is operating, while unit 2 is standing by.
The degree of cleanness of the filter elements is monitored with a differential pressure switch, or pick-up, 1.13 installed across the incoming and o
REFERENCES:
patent: 3478883 (1969-11-01), Deluca
patent: 4282100 (1981-08-01), Kunishio et al.
Dawson Robert A.
Drodge Joseph
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