Abstract At preferably circular filter cartridges, where pleated filter material is placed around a centrally arranged perforated tube, this filter material can be sucked to collapse if the pressure gradient through the material becomes large, whereby the advantages having a pleated filter cartridge with a relatively large filter surface and a very little volume are lost. One means for preventing such collapse is using a separator which is arranged in each pleat of the filter material, whereby the separator includes a rigid organic foil formed in a pyramidal pleating, the amplitude of this pleating increasing from zero in the edge of the pleat of the filter material to maximum at the centrally arranged perforated tube constituting the base of the pleat of the filter material. Manufacturing a light construction of a filter cartridge is hereby obtained which is able to resist pressure gradients up to a certain limit without being sucked to collapse. With the separators it is secured that the capacity of the filter is present during the lifetime of the filter independent of the pressure difference between outside and inside of the filter material.
In a separator arrangement for filter cartridges wherein a pleated filter element is disposed around a centrally located perforated tube and wherein separators are located in the pleats of the filter element, the improvement wherein the separators each comprise an elongate member providing substantial rigidity and extending along substantially the entire length of the filter pleat in which the separator is located, said separators each including pyramidal pleats therein which extend generally transverse to the filter pleat in which the separator is located, each separator member extending between the perforated tube at one lateral edge and the apex of the filter pleat in which the separator is located at the other lateral edge and the amplitude of the separator pleats in each separator member increasing from substantially zero at the edge of the separator member adjacent to the apex of the filter element pleat in which the separator member is located to a maximum at the edge adjacent to the perforated tube.
Claim 2
Dependent Claim
162 words
In a separator arrangement for filter cartridges wherein a pleated filter element is disposed around a centrally located perforated tube and wherein separators are located in the pleats of the filter element, the improvement wherein the separators each comprise an elongate member providing substantial rigidity and extending along substantially the entire length of the filter pleat in which the separator is located, said separators each including pyramidal pleats therein which extend generally transverse to the filter pleat in which the separator is located, each separator member extending between the perforated tube at one lateral edge and the apex of the filter pleat in which the separator is located at the other lateral edge and the amplitude of the separator pleats in each separator member increasing from substantially zero at the edge of the separator member adjacent to the apex of the filter element pleat in which the separator member is located to a maximum at the edge adjacent to the perforated tube.
Claim 3
Dependent Claim
16 words
A separator arrangement as claimed in claim 1 wherein said separator member comprises a foil member.
Claim 4
Dependent Claim
16 words
A separator arrangement as claimed in claim 1 wherein said separator member is fabricated of plastic.
Claim 5
Dependent Claim
17 words
A separator member as claimed in claim 3 wherein said separator member is fabricated of a polycarbonate.
Claim 6
Dependent Claim
27 words
A separator arrangement as claimed in claim 1 wherein said filter cartridge is circular in cross section and wherein said perforated tube is circular in cross section.