A tube-and-tube heat exchanger tube box sealing structure

Abstract

In the tube box sealing structure of the tube-and-tube heat exchanger of the present application, the end of the tube box tube section is provided with a protruding box lip, the flat gasket ring is provided with a protruding gasket lip, and the end of the tube box tube section is provided with a protruding lip. It is tightly connected with the diaphragm sealing disc through the box lip and the gasket lip; or, the flat gasket edge ring is provided with a protruding gasket lip, and the end of the tube box barrel section is tightly and tightly connected with the flat gasket edge ring through the gasket lip; or, the tube A protruding box lip is provided at the end of the box-tube section, and the end of the box-tube section is tightly and sealingly connected with the diaphragm sealing disc through the box lip. Compared with the existing technology, the original direct welding of the end of the pipe box and the flat bead ring is changed to the welding of the lip of the box lip and / or the lip of the backing lip, which avoids the damage of the direct welding to the end of the pipe box and the flat bead ring , and the convex lip can be used repeatedly, which improves the utilization rate. At the same time, the pipe box sealing structure integrates various structural advantages. Its design technology is simple and mature, the sealing performance is good, the structure is simple, the manufacturing cycle is short, and the cost is low. Further improve the assembly quality of the pipe box.

Description

technical field [0001] This application relates to the sealing technology of the shell and tube heat exchanger tube box in equipment engineering, especially to a special heat exchange and energy-saving equipment for petroleum refining and chemical industry, coal chemical industry, chemical fertilizer industry, air conditioning, air cooling, and electric power facilities. The utility model relates to a tube box sealing structure of a tube-and-tube heat exchanger. Background technique [0002] In the prior art, the tube-and-tube heat exchanger is the most widely used heat exchanger, widely used in the fields of chemical industry, petroleum, medicine, food, light industry, metallurgy, coking, etc. Convective heat transfer of "steam-steam" and "steam-liquid" heat exchange, as well as heat exchange and condensation processes such as steam condensation and liquid evaporation heat transfer. [0003] The usual structure of the shell and tube heat exchanger in the prior art is as fo...

AI Technical Summary

Problems solved by technology

[0008] First, the complex structure

Thread locking ring heat exchanger tube box seal, the compression plate, sealing plate and bolts used are all vulnerable parts; when the seal leaks, the bolts need to be manually tightened to adjust and compensate, and the operation is under pressure and temperature. Make operation troublesome and unsafe

[0009] Second, a high level of soldering is required

[0010] Third, the structure is huge

Such as the ordinary large flange type seal, the flange and end cover are very thick, and there is no temperature compensation adjustment

[0011] Fourth, the structure is often cracked, unsafe and difficult to maintain

The elastic metal sealing ring and the sealing ring groove are used for double sealing. The two elastic metal sealing rings can work together with the groove wall of the corresponding sealing ring groove at the same time to produce a small amount of expansion deformation to further clamp the seal. The two cooperate with each other, there is no mutual interference effect and sealing force offset phenomenon, and they have the function of mutual compensation; however, the processing of the sealing ring groove in the above structure is relatively complicated, the manufacturing cost is high, and the manufacturing cycle is long. Moreover, the seal between the simple seal ring groove and the metal seal ring is a dynamic seal, and at least two seal ring grooves are required to match at least two elastic metal seal rings to achieve a better sealing effect.

[0013] Further, the applicant tried to use direct welding between the end of the pipe box barrel section and the flat edge ring to achieve a tight seal connection, but found that the direct welding caused great damage to the end of the pipe box and the flat edge ring, making The service life of the sealing diaphragm is short, and the repair of the end of the pipe box is not convenient for maintenance and use in actual use

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