A kind of fluoroplastic condenser welding equipment and its welding process

Abstract

The invention provides fluoroplastic condenser welding equipment, comprising an outer shell, an infrared heater disposed at the inner side of the outer shell, a fan disposed at the upper part of the outer shell, a fixing mold disposed at the lower end of the outer shell, a tube plate disposed below the outer shell through the fixing mold, a tube bundle connected to the tube plate through the fixing mold and a temperature sensor connected to the fixing mold. The tube bundle is provided with a modified PTFE inner core. Besides, the invention also provides a process for welding by using the equipment. The fluoroplastic condenser welding equipment prepared by the welding process provided by the invention is expected to achieve the following technical indexes: (1) a welding depth is larger than 8 mm; a welding surface is flat; and the fluoroplastic condenser welding equipment has no bubble; (2) pressure tests after shaping show that the fluoroplastic condenser welding equipment has no bubble after being kept for 30 minutes at a temperature of 25 DEG C and gas tightness of 0.45 MPa; and hydrostatic test show that the fluoroplastic condenser welding equipment has no leakage after being kept for 30 minutes at a pressure of 0.6 MPa.

Description

technical field [0001] The invention relates to industrial equipment and its application, in particular to a fluoroplastic condenser welding equipment and its welding process. Background technique [0002] Both trichloroacetic acid and hydrogen fluoride are toxic chemical products. If the dust is accidentally inhaled, it will irritate the respiratory tract and cause coughing, chest pain and depression of the central nervous system; direct eye contact can cause serious damage, and severe cases can lead to blindness; skin contact Can cause chemical burns. Therefore, strictly avoid leakage in all links during the production process, especially in the cooling process. Therefore, higher requirements are put forward for the performance technology of the condenser. [0003] The condenser belongs to the heat exchanger, and the fluoroplastic heat exchanger was first successfully manufactured and commercialized by DuPont Company of the United States in 1965. my country has also inv...

AI Technical Summary

Problems solved by technology

[0002] Both trichloroacetic acid and hydrogen fluoride are toxic chemical products. If the dust is accidentally inhaled, it will irritate the respiratory tract and cause coughing, chest pain and depression of the central nervous system; direct eye contact can cause serious damage, and severe cases can lead to blindness; skin contact Can cause chemical burns

However, the current fluoroplastic tube sheet and tube connection process is simple, easy to operate and short process flow, etc., but the labor productivity is low, the process operation is difficult to mechanize, and the material consumption of the tube sheet is high, which makes the fluoroplastic heat exchanger expensive and affects its promotion. application

In addition, the traditional welding process and welding equipment can not control the uniformity of temperature very well, so the welding depth is not enough, and it is easy to cause leakage under long-term use, and the metal core expansion technology is adopted, and the metal core will be tilted under the action of gravity Drooping, when the perfluoroalkoxy resin (PFA) tube-sheet bundle is in the molten state, because the specific gravity of the metal core is 3.5 times greater than that of the fluoroplastic, the welding section is unbalanced, which affects the welding appearance and welding quality. Thermal expansion and contraction lead to deformation of the plastic pipe, resulting in easy leakage during use; and the PFA material will corrode the metal core at a high temperature for a long time, and the bonded core needs to be replaced from time to time, which increases the manufacturing cost

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