Liquid purification or separation – Sectional chamber press type – With repair or assembling means
Patent
1997-08-25
1999-12-28
Savage, Matthew O.
Liquid purification or separation
Sectional chamber press type
With repair or assembling means
210499, B01D 25176
Patent
active
060077174
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a filter fabric apparatus for a filter press and has more particular reference to a barrel neck connection for or between spaced filter cloths in producing a filter fabric for a filter press.
It is known to provide on filter presses and some other filter types filter plates having a slurry feed hole in the filtering area. Both sides of such a filter plate are covered with a layer of filter material and each layer is provided with a feed hole. It is necessary to prevent the slurry from escaping between the filter layers and the filter plate in the region of the feed hole.
In one known arrangement a connecting device consisting essentially of a short cylinder having a flange at one end and threaded at the other is passed through the feed hole of one layer, through the hole in the filter plate and through the hole in the other layer. An annular ring is placed over the projecting cylindrical portion and a nut is screwed onto the threaded portion so pressing the layers of filter material between the flanges and the filter plate to provide a seal. This type of fixing is difficult and time consuming to assemble and often difficult to dismantle when the filter fabric has reached the end of its useful life.
In another known arrangement the two layers of filter material are interconnected at the feed hole by a cylindrical portion made from the filter cloth material which portion is stitched at one end to one layer and at the other end to the other layer to form a so called "barrel neck" filter cloth. The stitching operation is particularly time consuming and installing the filter cloth necessitates passing one layer of the cloth through the feed hole in the filter plate. Furthermore if the filter cloth becomes hardened during use it is often impossible to remove the cloth without cutting. Thus removal for washing is prevented and the useful life of the filter cloth is reduced. Also if one side of the cloth becomes damaged the complete filter cloth must be disregarded.
In order to overcome the problem of stitching a known filter cloth (described in GB Patent Specification No. 1459099) of the "barrel neck" type utilises a hollow plastics cylinder which is secured to the two layers of the filter cloth by heat bonding. However, the problems of fitting and removing the cloth still remain.
In another known arrangement described in German Published Patent Specification No. 2110860 a pair of filter cloths which cover the respective sides of a filter plate are each provided with a connecting device which is semi-circular in cross-section and which is made from an elastic deformable material. The device is secured to the filter cloth and when installed in the press the semi-circular portions of each device lay tightly over one another.
In practice the connections of this type have been found to be difficult to install because the semi-circular section must be deformed substantially. In addition some support is required for the connection to ensure adequate sealing between the two components.
GB 2088231 describes a filter arrangement comprising two filter cloths on opposite sides of a filter press connected by a barrel neck connection. The barrel neck connection comprises two annular members each of which is secured to one of the filter cloths. The ends of the annular members are constructed to connect releasably together with a snap fit. However, such an arrangement is difficult to manufacture in a cost effective manner in that the rings must be made to a close tolerance if they are to fit together correctly. Furthermore if the rings are manufactured to such a close tolerance they are difficult to prise apart and are often damaged in doing so. Hence, they cannot be reused.
The present invention has been made from a consideration of these problems.
According to the present invention there is provided a filter fabric apparatus for a filter press comprising first and second filter cloths, each having a feed opening therein and a feed passage between the feed openings, the apparatus comprising at
REFERENCES:
patent: 4931178 (1990-06-01), Manniso et al.
Hayhurst Peter
Lofts Peter
Savage Matthew O.
Scapa Group PLC
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