Patent ID: 9102024
Filing Date: 2015-08-11
Classification: B23Q,F22B,F28D,F28F,Y10T

Abstract:
1. A clearance increasing jig of a heat transfer tube, comprising: a jig main body inserted into a clearance between adjacent heat transfer tubes; an inflow hole provided in the jig main body and configured to allow a fluid to flow into the jig main body; and an increasing unit provided in the jig main body and configured to increase the clearance as the fluid flows into the jig main body, wherein the jig main body includes, a cylinder body having apertures at both longitudinal sides, a front end member which becomes a front end at an insertion side into the clearance while encapsulating one aperture of the cylinder body, and a rear end member with the inflow hole while encapsulating the other aperture of the cylinder body, wherein the cylinder body is a square cylinder body including four sides, the four sides include a pair of contact portions facing each other, which contact the heat transfer tubes, and a pair of non-contact portions facing each other, which do not contact the heat transfer tubes, and rigidity of the square cylinder body at each non-contact portion is larger than that of the square cylinder body at each contact portion, wherein the thickness of the square cylinder body at each non-contact portion is larger than that of the square cylinder body at each contact portion, and wherein the square cylinder body includes, a pair of concave-shaped members having a concave-shaped cross section, and a pair of welding portions provided by welding a groove formed by butting both ends of the pair of concave-shaped members, and the pair of welding portions are provided at the pair of non-contact portions and configured by rib portions that reinforce the pair of non-contact portions.