Compact filter cells

Abstract

Abstract A securing and guiding arrangement for compact filter cells of the type comprising a web of textile material folded into a number of deep, transversely extending folds and having longitudinally extending seams at each fold to provide a predetermined number of mutually and identical passages for purified gas. All of the passages are open in one and the same mutual direction and are closed in the opposite direction (at the bottom of the fold), and each of the passages are provided with a shaping member which imparts thereto a particular cross-sectional shape which may be a square shape. The member has a diagonal which coincides with the direction in which the row of passages extends, and the two remaining corners of the member lie against corresponding corners of passages in adjacent rows of passages, and each of the rows of passages for purified gas is surrounded by rows of mutually parallel crude-gas passages formed between the folds and having the same square cross-sectional shape as the purified-gas passages. The crude-gas passages are open in one and the same mutual direction which is opposite to that of the purified-gas passages, and are closed in the opposite direction in an upper frame which comprises part of a right-angled parallel epipedic filter cassette. This frame is arranged to be brought, through the intermediary of an intermediate packing member into sealing abutment with a connecting frame arranged in a common filter housing suitable for accommodating a plurality of cassettes, the cassettes, in addition to the upper frame, is provided with a corresponding lower frame and with frame portions which connect the upper and lower frames at the corners thereof. The upper frame has the form of an upwardly open U-shaped section, suitably having slightly converging flanges whose edge portion are folded inwardly through an angle of approximately 180*, and which is provided with a number of transverse support stays having rounded upper edges. The stays are securely connected to the upper frame in positions which coincide with a central plane in the crude-gas passages. The lower frame is provided with transverse distance stays arranged in the central plane of the crude-gas passage rows, which distance stays together with the shaping member fix the passages against lateral movement in that the compact filter cell along all side edges at the side where the purified gas passages are open is provided with a fold edge of such width that it can be folded in and shaped along at least the inner flange and the bottom of the Ushaped section of the upper cassette frame and be retained in position by means of a resilient sealing strip which when seen in cross section, is rectangular of frusto-triangular in shape and which has a greater height than the flanges. The sealing strip subsequent to the filter cassette is connected to the connecting frame of the filter housing and arranged to provide sealing between the cassette and the filter housing and between the filter cell and the cassette frame and to increase the securing forces of the folding edges in the U-shaped section so as to provide an operably reliable filter unit.

Inventors

• 👤 Karl-Axel G Gustavsson
• 👤 Holger A Persson

Bibliographic Details