Header body pressure-bearing type water storage type heat exchanger

Abstract

The invention discloses a header body pressure-bearing type water storage type heat exchanger. A plurality of cold water round pipes are connected between two header bodies, round inner hole reinforcing plates are arranged in pipe orifices, the outer plate edges of the plates are connected with the cold water round pipe orifices through welding, and inner hole plates, cold water round pipes and round inner hole reinforcing plates are welded into a single unit in a close fit mode; in each cold water round pipe, a heating round pipe or a plurality of branched small heating round pipes of a combined heating round pipe are inserted in the holes of each round inner hole reinforcing plate, and the combined heating round pipe comprises short connecting pipes at the two ends and a plurality of branched small heating round pipes arranged at the middle in a connecting mode; the heating round pipes and / or combined heating round pipes are connected through heating connecting round pipes; external plates of the headers surround the heating round pipes or combined heating round pipes and are tightly welded with the internal hole plates of the headers. According to the header body pressure-bearing type water storage type heat exchanger, the round inner hole reinforcing plates enable the cross sectional area of the header hole plate to be increased, the compressive strength and tensile strength of the header hole plate are reinforced, and the fatigue damage to pipe socket fillet weld due to expansion thermal stress and temperature cycling is effectively prevented.

Description

technical field [0001] The invention relates to a heating heat exchanger which can be installed and used on the heating pipe of a family bathing room to provide heating and exchange for hot water for bathing, in particular to a header body pressure storage tank in which a stainless steel tube and a tube plate are welded together. Water heat exchanger. Background technique [0002] The applicant applied for a pressure header heat exchanger on July 10, 2011. The patent number is 201120255532.1, the announcement number is CN202177324U, and the invention name is a pressure header heat exchanger. [0003] On February 8, 2012, the applicant applied for a header welding heat exchanger with double partition walls, the patent number is 201220040302.8, and the announcement number is CN202442615U. device. [0004] The applicant applied again on November 4, 2013 for a multi-tube heat conduction heat exchanger for header, shell and tube water storage and heating. tube heat exchanger. ...

AI Technical Summary

Problems solved by technology

[0006] In the prior art, the inner orifice plate of the header has a cold water pipe installation hole, the cold water pipe is inserted into the orifice plate installation hole and welded to communicate, the edge of the orifice plate is folded outward, and the outer plate of the header and the edge of the orifice plate are pinched The self-fusion welding connection makes the straight side welds of the header body less prone to water leakage; however, because the welds are concentrated on the inner orifice plate of the header, there are many and long welds, and the expansion stress of the cold water is large, causing the orifice plate to be seriously deformed. The expansion stress leads to the destruction of the fillet weld of the orifice plate and the cold water pipe, which makes the crack of the fillet weld of the orifice plate of the header

Moreover, stainless steel materials cannot be welded repeatedly, and the return rate of products after sales is high, the maintenance cost is high, the transportation cost is high, and the scrap rate is high, resulting in header heat exchanger products being eliminated by the market.

[0007] The present invention analyzes the defects (phenomena) of the cracking of the fillet weld of the above-mentioned header pipe seat mainly as follows: the welded structure form (plug-in type) of the cold water pipe is unreasonable, the strength of the root of the welded connection is not guaranteed and the thermal expansion stress has nowhere to be released. The alternation caused by temperature changes constitutes the fatigue damage of the orifice plate. The thermal stress makes the fillet weld on the orifice tube seat of the header restrict the expansion of the base material on the surface of the header. The fixed support on the structure causes the expansion to be hindered. The affected area will be affected by large expansion stress, and the distance between the diameter side of the cold water pipe and the transverse face plate of the orifice plate is too close to cause the stress to be difficult to release, resulting in the cracking of the fillet weld of the cold water pipe seat or the occurrence of pipe wall fracture and leakage defects

[0008] According to the above analysis of the header water storage heat exchanger, the welding connection between the header orifice plate and the cold water pipe has insufficient reliability in use: find out that the cross-sectional area of ​​the cold water pipe inserted into the header orifice plate in the prior art reduces the strength of the orifice plate Or the decrease of compressive capacity, which is the main reason for the cracking of the fillet weld between the cold water pipe and the transverse surface of the orifice plate or the fracture and leakage of the pipe wall

[0009] It can be seen that the welding connection between the pipe and the orifice plate of the existing header water storage heat exchanger does not meet the reliability requirements of use.

Images