Method of manufacturing heat exchanger and heat exchanger

Patent metadata

Field	Value
Publication number	US-10188781-B2
Application number	US-201615221732-A
Country	US
Kind code	B2
Filing date	Jul 28, 2016
Priority date	Jan 31, 2014
Publication date	Jan 29, 2019
Grant date	Jan 29, 2019

Abstract

A heat exchanger has a hollow fiber membrane layer comprised of a plurality of hollow fiber membrane conduits each of which has a hollow portion allowing a heat medium to pass therethrough. The conduits are derived by winding a base cord of the hollow fiber membrane onto a cylindrical body. The winding follows a generally helical trajectory around the longitudinal axis of the cylindrical body with a plurality of continuous round trips from the first end to the second end and turning back at each respective end, wherein each round trip completes a number of circumferential revolutions N, wherein N is greater than or equal to one, and wherein N is less than two.

First claim

What is claimed is:

1. A method of manufacturing a heat exchanger having a hollow fiber membrane layer and comprised of a plurality of hollow fiber membrane conduits each of which has a hollow portion allowing a heat medium to pass therethrough, the method comprising the steps of:
providing a cylindrical body for supporting the fiber membrane layer, wherein the cylindrical body has an outer surface defining a longitudinal axis and first and second longitudinal ends;
winding a continuous base cord of hollow fiber membrane onto the cylindrical body along a generally helical trajectory around the longitudinal axis with a plurality of continuous round trips from the first end to the second end and turning back at each respective end, wherein each round trip completes a number of circumferential revolutions N, wherein N is greater than or equal to one, wherein N is less than two, wherein an inclination angle of the hollow fiber membrane between turning-back portions ranges from 40° to 70°, and wherein each turning-back portion is folded at an acute angle;
continuously fixing in place each respective turning-back portion at the first end and the second end during the winding of the base cord;
cutting longitudinal end portions from the fiber membrane layer, thereby removing the turning-back portions to introduce open ends for the hollow fiber membrane conduits;
wherein the winding step satisfies an expression Traverse [mm/rotation]×N=traverse oscillation width×2±(outer diameter of hollow fiber membrane+gap between hollow fiber membranes adjacent to each other)×total number of hollow fiber membranes (where N satisfies 1≤N<2).

2. The method of claim 1 wherein N satisfies 1.2≤N≤1.6.

3. The method of claim 1 wherein the step of fixing in place each respective turning-back portion is comprised of continuously winding a respective flexible fixing body at the first and second ends to compress each respective turning-back portion;
wherein the cutting step removes the fixing bodies.

4. The method of claim 3 wherein the fixing bodies are each comprised of a flexible string-like body.

5. The method of claim 3 wherein the fixing bodies are each comprised of a flexible belt-like body.

6. The method of claim 1 wherein the step of fixing in place each respective turning-back portion is comprised of subjecting the turning-back portion to heat-melting.

7. The method of claim 1 wherein the step of fixing in place each respective turning-back portion is comprised of applying an adhesive.

8. The method of claim 1 wherein the base cord of hollow fiber membrane is comprised of a polyolefin-based resin.

9. The method of claim 1 wherein an outer diameter of the base cord of hollow fiber membrane is equal to or less than 1 mm.

Assignees

• Terumo Corp

Inventors

• Saito Takashi

Classifications

• B01D2313/22

  Cooling or heating elements · CPC title

• A61M1/1629

  with integral heat exchanger · CPC title

• B01D2313/90

  Additional auxiliary systems integrated with the module or apparatus · CPC title

• F28D2021/005

  for medical applications · CPC title

• B29C53/665

  Coordinating the movements of the winding feed member and the mandrel · CPC title