Fin tube type heat exchanger

Abstract

The invention provides a fin tube type heat exchanger, which comprises heat exchange tubes, fins, tube plates, a larger end cover and small end covers, wherein the fins are closely contacted with the heat exchange tubes; the tube plates and the large and small end covers are respectively positioned at the two end parts of the fins; an oil storage cavity I and oil storage cavities II are respectively formed between the large and small end covers and the two tube plates; a liquid inlet and a liquid outlet are arranged in the small end covers; stepped holes are manufactured in the tube plates; the heat exchange tubes are inserted into the stepped holes and are in clearance fit with small hole ends of the stepped holes; copper sleeves are arranged in large hole ends of the stepped holes; the thicknesses of the lower end parts of the copper sleeves are greater than the thicknesses of the upper end parts of the copper sleeves; the lower ends of the copper sleeves are closely propped against steps at the bottoms of the large hole ends of the stepped holes to position the copper sleeves; and clearances for braze welding materials to flow into are reserved between the upper end parts of the copper sleeves and the heat exchange tubes as well as between the tube plates and the heat exchange tubes. The fin tube type heat exchanger has the advantages that the evenness of the welding clearances is guaranteed when the copper tubes are welded with the tube plates, the welding materials are fully filled, the welding strength is greatly increased, and meanwhile, working products cannot leak or have other defects in a high-frequency vibration environment.

Description

technical field [0001] The invention belongs to the technical field of heat exchange equipment, and in particular relates to a finned tube heat exchanger. Background technique [0002] Conventional fin-tube heat exchangers are mostly used in static state and normal temperature working environment, but in high-temperature, high-frequency vibration working environments, the reliability requirements of products are higher, and conventional fin-tube heat exchangers are difficult to meet such requirements . The copper tubes of traditional finned tube heat exchangers are generally thin-walled copper tubes of 0.35-0.50 mm, and the tube sheets are sheet metal parts of 1.5-2 mm. When the copper tubes and tube sheets are welded, traditional welding methods cannot Ensure that the brazing material is evenly filled on the circumference of the copper tube (see attached Figure 6 ). The solder flow and solder filling during brazing are affected by the concentricity of the copper tube and...

AI Technical Summary

Problems solved by technology

[0002] Conventional fin-tube heat exchangers are mostly used in static state and normal temperature working environment, but in high-temperature, high-frequency vibration working environments, the reliability requirements of products are higher, and conventional fin-tube heat exchangers are difficult to meet such requirements

The copper tubes of traditional finned tube heat exchangers are generally thin-walled copper tubes of 0.35-0.50 mm, and the tube sheets are sheet metal parts of 1.5-2 mm. When the copper tubes and tube sheets are welded, traditional welding methods cannot Ensure that the brazing material is evenly filled on the circumference of the copper tube (see attached Image 6 )

The solder flow and solder filling during brazing are affected by the concentricity of the copper tube and the tube sheet, and the consistency is poor. The fillability of the weld cannot be measured, the quality of the weld cannot be judged, and the reliability and fatigue life of the weld cannot be evaluated. The service life of the tube cannot be guaranteed. When the product is working under high-frequency vibration or the tube is inflated for air tightness test, the contact part between the copper tube and the tube sheet will be squeezed due to the small area, causing deformation and leakage of the copper tube. , so it is necessary to improve

Images