Patent ID: 8128824
Filing Date: 2012-03-06
Classification: B01D

Abstract:
1. A filter module comprising: a plurality of filter layers, each filter layer including a filtrate surface, an opposite non-filtrate surface, a first end region and a first periphery, and a second end region and a second periphery and further including a filter medium; a plurality of draining spacer elements including filtrate spacer elements and non-filtrate spacer elements, each filtrate spacer element including a filtrate sealing element at a first edge region of the filtrate spacer element, a filtrate flow element at a second edge region of the filtrate spacer element, and a filtrate drainage element intermediate the filtrate sealing element and the filtrate flow element and each non-filtrate spacer element including a non-filtrate flow element at a first edge region of the non-filtrate spacer element, a non-filtrate sealing element at a second edge region of the non-filtrate spacer element, and a non-filtrate drainage element intermediate the non-filtrate flow element and the non-filtrate sealing element; wherein the plurality of filter layers and draining spacer elements are stacked on one another in an axial direction of the filter module, the stack having an outer circumference and comprising a non-filtrate spacer element, a filter layer, a filtrate spacer element, a filter layer, a non-filtrate spacer element, a filter layer, and a filtrate spacer element and the stack defining a filtrate chamber adjacent the filtrate surface of each filter layer and a non-filtrate chamber adjacent the non-filtrate surface of each filter layer; wherein each filter layer is positioned between a non-filtrate spacer element and a filtrate spacer element, each non-filtrate drainage element is positioned between and fluidly communicates with the non-filtrate surfaces of adjacent filter layers, and each filtrate drainage element is positioned between and fluidly communicates with the filtrate surfaces of adjacent filter layers; wherein the non-filtrate sealing element and the non-filtrate flow element of each non-filtrate spacer element are thicker in the axial direction than the intermediate non-filtrate drainage element, and the non-filtrate drainage element extends along a space between the non-filtrate surfaces of adjacent filter layers; wherein the first end region of each filter layer is compressed and sealed along the first periphery between a non-filtrate flow element of a non-filtrate spacer element and a filtrate sealing element of a filtrate spacer element, the non-filtrate flow element fluidly communicating between the non-filtrate drainage element of the non-filtrate spacer element and one of an exterior chamber and an interior chamber while the filtrate sealing element seals the filtrate drainage element of the filtrate spacer element from said one of the exterior and interior chambers, and the second end region of each filter layer is compressed and sealed along the second periphery between a non-filtrate sealing element of the non-filtrate spacer element and a filtrate flow element of the filtrate spacer element, the filtrate flow element fluidly communicating between the filtrate drainage element of the filtrate spacer element and the other of the exterior and the interior chambers while the non-filtrate sealing element seals the non-filtrate drainage element of the non-filtrate spacer element from said other of the exterior and interior chambers; and wherein at least some of the draining spacer elements comprise connecting means around the outer circumference to compress and seal off the filter layers and wherein the connecting means of one draining spacer element first cooperates with the connecting means of another draining spacer element.