Internal and external finned tube inside evaporating and condensing dual-use ladder-shaped grid

Abstract

The invention relates to an internal and external finned tube inside an evaporating and condensing dual-use ladder-shaped grid. The internal and external finned tube comprises a pipe base body, spiraljagged inner fins, spiral jagged outer fins, inter-groove double wedges, grid fins, ladder fins and triangular top teeth. The grid fins are located on both sides of the spiral jagged outer fins, thegrid fins on the two sides of the same spiral jagged outer fins are staggered, the ladder fins are located on both sides of the spiral jagged outer fins and on the outside of the grid fins, the ladderfins on the two sides of the same spiral jagged outer fins are staggered, the ladder fins on the same side are interleaved with the grid fins, the inner side of the grid fins, the spiral jagged outerfins, the pipe base body, and the inter-groove double wedges enclose an evaporation chamber, the outer side of the grid fins, the spiral jagged outer fins, and the ladder fins enclose an enhanced cavity, the evaporation chamber and the enhanced cavity communicate with each other through gaps. The internal and external finned tube can improve heat transfer efficiency of evaporation and condensation and belongs to the technical field of enhanced heat transfer tubes.

Description

technical field [0001] The invention relates to an enhanced heat transfer tube, in particular to a stepped inner and outer finned tube for both evaporation and condensation. Background technique [0002] With the rapid development of the economy, the problem of energy shortage is becoming more and more serious. As an important means of energy saving, enhanced heat transfer technology is of great significance to solve energy problems, and has been widely used in petroleum, chemical industry, electric power, nuclear energy, refrigeration and other fields. Heat exchange tube is the core heat transfer element of enhanced heat transfer technology. Its main feature is that a certain surface structure is processed on the inner and outer surfaces of the tube to expand the heat transfer surface or increase the heat transfer coefficient, thereby improving heat transfer efficiency. [0003] In the field of refrigeration and air conditioning, heat pump units that can realize both cooli...

AI Technical Summary

Problems solved by technology

At present, the enhanced heat transfer technology mainly uses outer finned tubes as heat exchange tubes, but these outer finned tubes can only enhance evaporation or condensation unilaterally. It is lower than the evaporating tube because evaporation and condensation have different structural requirements for enhancing heat transfer surfaces. The evaporating tube requires more boiling cores, while the condensing tube requires the liquid film to be as thin as possible.

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