Short-circuit-proof heat-exchanger with helical baffles

Abstract

The present invention relates to a short-circuit-proof heat-exchanger with helical baffles, which comprises a housing, helical baffles and heat exchange tubes extending through the helical baffles, wherein two straight sides of the sector baffles with a projection of 360°/4 are respectively widened and overlap in turn, and the heat exchange tubes pass through the overlapping parts. The present invention is characterized in that the short-circuit-proof heat-exchanger with helical baffles also comprises pull rods, wherein one pull rod is positioned on the central axis of the housing and extends through the widened overlapping parts of the helical baffles, and the other pull rods extend through both end areas of the central line of the projection of the widened overlapping parts of the helical baffles; one end of each pull rod is fixed to the internal surface of a tube sheet arranged at one end of the housing, and the other end is fixed to the last corresponding helical baffle; distance tubes are segmentally sheathed on the pull rods. The present invention has the advantages of reasonable structure, increased heat exchange efficiency, enhanced integral rigidity and shockproof performance, simplified assembly technology, saved cost and increased work efficiency. The shell-tube heat exchanger with helical baffles can be extensively used in the technical processes of petroleum industry, chemical industry, power generation industry, metallurgical industry, food industry, pharmaceutical industry, etc.

1 . A short-circuit-proof heat-exchanger with helical baffles, comprising:
 a housing ( 1 ),   helical baffles ( 4 ) arranged in the housing;   heat exchange tubes ( 5 ) extending through the helical baffles, wherein two straight sides of the sector baffles ( 4 ) with a projection of 360°/4 are respectively widened and overlap in turn, and the heat exchange tubes ( 5 ) pass through widened overlapping parts; and   pull rods ( 2 ), wherein one pull rod is positioned on the central axis of the housing ( 1 ) and extends through the widened overlapping parts of the helical baffles ( 4 ), and the other pull rods extend through both end areas of the central line of the projection of the widened overlapping parts of the helical baffles; wherein one end of each pull rod ( 2 ) is fixed to the internal surface of a tube sheet arranged at one end of the housing ( 1 ), and the other end is fixed to the last corresponding helical baffle ( 4 ); distance tubes ( 3 ) are segmentally sheathed on the pull rods ( 2 ).   
     
     
         2 . The short-circuit-proof heat-exchanger with helical baffles of  claim 1 , also comprising:
 connecting positioning tubes ( 6 ) and pull rods ( 2 ), extending through the intermediate area of the central line of the projection of the widened overlapping parts of the helical baffles ( 4 ); wherein both ends of each connecting positioning tube ( 6 ) have a distance away from the tube sheets arranged at both ends of the housing ( 1 ) and are fixed to the corresponding baffles arranged at the ends; wherein one end of each pull rod ( 2 ) is fixed to the internal surface of the tube sheet arranged at one end of the housing ( 1 ), and the other end is fixed to the last corresponding helical baffle ( 4 ); and distance tubes ( 3 ) are segmentally sheathed on the pull rods ( 2 ).   
     
     
         3 . The short-circuit-proof heat-exchanger with helical baffles of  claim 1 , wherein the widened overlapping parts of the helical baffles ( 4 ) have a width of 10 mm to 100 mm. 
     
     
         4 . The short-circuit-proof heat-exchanger with helical baffles of  claim 2 , wherein the widened overlapping parts of the helical baffles ( 4 ) have a width of 10 mm to 100 mm.