Patent ID: 9707518
Date: 2017-07-18
CPC Classifications: B01D,C02F

Claim:
1. A hollow fiber membrane module including: a cylindrical case having one nozzle at the minimum in a side face thereof; a hollow fiber membrane bundle provided in the cylindrical case; and a flow straightening cylinder provided between the one nozzle at the minimum and an outer periphery of the hollow fiber membrane bundle and having a plurality of flow straightening holes, in which the hollow fiber membrane bundle includes a plurality of hollow fiber membranes, that are open at one end and sealed at the other end, or at least one U-shaped hollow fiber membrane, that is open at opposite ends, and includes a hollow fiber membrane open end fixing member for fixing the open end of each of the hollow fiber membranes, a side peripheral face of the hollow fiber membrane open end fixing member is joined to an inner peripheral face of the cylindrical case, each of the hollow fiber membranes passes through the hollow fiber membrane open end fixing member, each of the open ends is positioned at an outer surface of the hollow fiber membrane open end fixing member, the outer surface positioned outside the cylindrical case, and the flow straightening cylinder is fixed to the hollow fiber membrane open end fixing member, wherein the flow straightening cylinder includes a large inner diameter portion and a small inner diameter portion having a smaller inner diameter than an inner diameter of the large inner diameter portion at least at a part in an axial direction of the flow straightening cylinder, an inner surface of the hollow fiber membrane open end fixing member positioned on an opposite side from the outer surface and inside the cylindrical case is positioned at the small inner diameter portion of the flow straightening cylinder, the flow straightening cylinder has a step between the small inner diameter portion and the large inner diameter portion, and clearance is formed between the flow straightening holes of the flow straightening cylinder and the hollow fiber membrane bundle.