| 摘要 |
<p>PURPOSE: To reduce fluctuation of performance in flow distribution by a method wherein both ends of a substantial U-shaped pipe are constituted by a bent section which is substantially at right angles against a substantial U-shaped pipe with both the ends being bent in the same direction and a projecting pipe extended from a part near the central part of the substantial U-shaped pipe and protruded in parallel with the bent section. CONSTITUTION: Bent sections 11 are bent at a substantial right angle in respect to a substantial U-shaped pipe 10 and in the same direction. A protrusion pipe 12 is made by pushing out a pipe from a location near the central part of the substantial U-shaped pipe 10 in parallel with the bent sections 11. The ends of the bent sections 11 and the protrusion pipe 12 are inserted into some heat transfer pipes of a heat exchanger and the refrigerant may flow from the protrusion pipe 12 toward the bent sections 11. In the case that the protrusion pipe 12 is formed, lead 14 is enclosed in a straight pipe 10' in the same manner as that of the prior art and then it is pressurized at both ends of the straight pipe 10'. Then, the protrusion pipe 12 is pushed out of a location near the central part of the straight pipe 10'. After this operation, the end part of the protrusion pipe 12 is cut to form a shape as shown in the figure and then the lead is melted. Owing to this fact, the length L2 of the protrusion pipe 12 can be made short, no protrusion part is formed at the inner surface of the pipe, and hence, fluctuation of distribution performance of the flow can be reduced.</p> |
