Feed spacer and reverse osmosis filter module including same
Provided is a feed spacer, in which angles of strands are differently formed in one feed spacer according to a flow direction of raw water, so that a differential pressure decrease region and a recovery increase region are separated to perform multiple functions, and a reverse osmosis filter module including the feed spacer.
1. A feed spacer, comprising:
an area A and
an area B, and each of area A and area B comprises:
a first set, in which a plurality of strands is positioned in parallel; and
a second set, in which a plurality of strands crosses the plurality of strands of the first set and is positioned in parallel,
wherein:
the strands of each of the first and the second set include a plurality of protruding portions having a diameter W 2 , and the protruding portions of the strands forming the first set cross the protruding portions of the strands forming the second set, thereby determining a thickness of the feed spacer, the strands of the first set and second set in area A include non-protruding portions having a diameter W 1 ,
the strands of the first set and second set in area B include non-protruding portions having a diameter W 1 ′,
a difference between the diameter W 2 of the protruding portions and the diameter W 1 of the non-protruding portions of the strands forming the area A is larger than a difference between the diameter W 2 of the protruding portions and the diameter W 1 ′ of the non-protruding portions of the strands forming the area B,
a crossing angle a 1 of the first set and the second set in area A is less than a crossing angle a 2 of the first set and the second set in area B, and
a cross-sectional area of a flow path in the area B is decreased with respect to a cross-sectional area of a flow path in area A.
2. The feed spacer of claim 1 , wherein a distance between cross points of the first set and the second set in the area B is smaller than a distance between cross points of the first set and the second set in the area A.
3. A reverse osmosis filter module comprising the feed spacer of claim 1 , wherein the area A is in a portion which is in first contact with raw water.
4. The reverse osmosis filter module of claim 3 , wherein the reverse osmosis filter module includes:
a tube including openings for accommodating a permeating liquid in a longitudinal direction; and
one or more reverse osmosis membranes, which are extended from the tube in an outside direction and are wound around a circumference of the tube, and
the feed spacer is in contact with the one or more reverse osmosis membranes and is wound around the circumference of the tube.