Tube Type Heat Exchanger and Manufacturing Method of the Same

Abstract

Provided are a tube type heat exchanger and a method of the tube type heat exchanger capable of preventing spiral fins 12 from being deformed. In the tube type heat exchanger and the manufacturing method of the same according to the present invention, the plural spiral fins 12 are disposed in series in the axial direction so as to have edges of the spiral fins 12, 12 spaced apart from each other, and each holder 3 is disposed between the spiral fins 12, 12 and abuts to the outer circumference of the tube body 11.

1 . A tube type heat exchanger comprising plural heat transfer tubes disposed in series so as to set axial directions thereof to be parallel to each other, and holders for holding the heat transfer tubes,
 each of the heat transfer tubes including a tube body for flowing fluid therein, and spiral fins formed by disposing fins spirally around an outer circumference of the tube body,   in each of the heat transfer tubes, the spiral fins being disposed in series in the axial direction so as to have edges of the spiral fins spaced apart from each other, and   each of the holders being disposed between the spiral fins, and abutting the outer circumference of the tube body.   
     
     
         2 . The tube type heat exchanger according to  claim 1 , wherein
 the spiral fins of each of the heat transfer tubes extend between spiral fins of another of the heat transfer tubes adjacently disposed in a radial direction of the heat transfer tube.   
     
     
         3 . The tube type heat exchanger according to  claim 1  or  claim 2 , wherein
 each of the holders includes a plurality of holding members for holding the tube bodies between the holding members. 
 
     
     
         4 . The tube type heat exchanger according to  claim 3 , wherein
 each of the holding members includes a plurality of holding portions for holding the tube bodies between the holding portions, and   each of the holding portions has a recess so as to fit a part of each of the tube bodies in the recess.   
     
     
         5 . The tube type heat exchanger according to  claim 3 , wherein
 each of the holders further includes connecting members for connecting the holding members for holding the tube body between the holding members.   
     
     
         6 . A method of manufacturing a tube type heat exchanger including plural heat transfer tubes disposed in series so as to set axial directions thereof to be parallel to each other, and holders for holding the heat transfer tubes, each of the heat transfer tubes including a tube body for flowing fluid therein, and spiral fins formed by disposing fins spirally around an outer circumference of the tube body,
 the method comprising:   a step of cutting fins of each heat transfer tube so as to form a plurality of the spiral fins in series in the axial direction to have edges of the spiral fins spaced apart from each other; and   a step of disposing each of the holders between the spiral fins and bringing the holder in contact with the outer circumference of each of the tube bodies so as to hold the heat transfer tubes.   
     
     
         7 . The method of manufacturing a tube type heat exchanger according to  claim 6 , wherein
 the step of cutting the fins of each of the heat transfer tubes includes:   rotating each of the heat transfer tubes around an axial center of the heat transfer tube by using a support member for supporting the heat transfer tube; and   moving at least one of a cutting portion for cutting the fins and the support member in the axial direction of the heat transfer tube so as to provide relative displacement in axial direction between the cutting portion and the heat transfer tube.