Liquid purification or separation – Plural distinct separators – Filters
Patent
1986-07-28
1989-01-31
Fisher, Richard V.
Liquid purification or separation
Plural distinct separators
Filters
210346, 210486, 55484, B01D 2916, B01D 2926
Patent
active
048013820
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a filter means for filtering gases, liquids or similar filtering media, preferably for process engineering plants, e.g. those of the foods and drinks industries, such as for compressed air preparation, particularly in sterile operation, optionally under overpressure conditions and/or at high temperatures.
Very high demands are made on filter means for a field of use of the aforementioned type. Apart from an assured complete fulfilment of the necessary filtering requirements, it is necessary to ensure a reliable, troublefree operation, because a failure of the filter means not only leads to unusable products, but also to enormous stoppage losses in the plants in question.
Particularly during the production of foods and drinks, such as in breweries, apart from the above requirements, it is frequently also necessary to ensure that the filtering agents are absolutely sterile after passing through the filter means. If the filter means fails in sterile operation, which is not always immediately detectable, considerable production quantities can be rendered unusable.
In general, such filter means have a very wide range of application and apart from use for filtering out fuels from gases, e.g. for separating oil from compressed air, (oil separators), they are used e.g. for deionizing water, removing microorganisms from drinks, nutrient broths from fermenters and the like. Such filter means must withstand temperatures up to 200.degree. C. and in part up to 300.degree. C. and pressures in the range of 16 to 20 or even 30 bar. They must also not fail if the design capacity is under certain circumstances briefly exceeded, even by double or even treble.
A filter means of the aforementioned type and for the aforementioned purposes is e.g. described in DE-OS No. 3,125,001. As can be gathered therefrom, such a filter means essentially comprises a tubular, normally vertically positioned filter material, which is held in an inner and outer tube, which is e.g. constructed in screen-like manner. At the top and bottom, the filter material, which is also referred to as filter cartridge, is held by a cover plate. In order to ensure a reliable seal between the filter material and the cover plate, for reliably preventing filter perforation, the filter material is bonded to both the upper and lower cover plate (cf e.g. U.S. Pat. No. 4,157,968). In additiona, it is also known to weld the filter cartridges to the corresponding covers. Replacement is necessary at regular intervals because after a certain operating period there is increasing clogging of the filter material and the filtering capacity decreases, or an unacceptably high pressure drop occurs. As a result of the aforementioned bonding or welding, in the case of the known filter means, it is necessary to replace the complete filter element, including the upper and lower covers, as well as the inner and outer tubes supporting the filter material, said parts generally being made from a high-grade material, particularly stainless steel. Quite apart from a not inconsiderable labour time, such a replacement involves considerable costs, because the parts to be replaced in the known filter means are made from a very high-grade material, e.g. stainless steel, so that they have a very value compared with the actual part which is subject to wear, i.e. the filter material. However, for the aforementioned fields of application, only the aforementioned filter means have hitherto been used. Onlly in the motor vehicle field is an air filter known, which comprises a segmentally constructed filter element, in which filter material in disk-like form is maintained in spaced manner by spacer rings (cf German Patent No. 681,303). These spacer rings in each case comprise tube portions with different diameters, having alternatley inwardly and outwardly directed webs. The spacer rings are superimposed in a regularly alternating sequence with interposed filter material. Thus, air sucked in its deflected upwards or downwards by the spacer ring with the outwardly direc
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patent: 4321140 (1982-03-01), Luthi
patent: 4391709 (1983-07-01), Schmidt, Jr.
patent: 4601826 (1986-07-01), Christophe et al.
patent: 4626351 (1986-12-01), Fuhring
patent: 4637876 (1987-01-01), Dosoudil
Fisher Richard V.
Millard Wanda L.
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