Heat exchanger

Abstract

The invention discloses a kind of heat exchanger which some U shaped pipes possessing two parallel straight pipe and includes some fin array disposed at certain distance along the vertical direction of the straight pipe. U shaped pipes connect each other with elbow and other connecting pieces which are made of aluminium or A-alloy material, overburden of copper is set on the outside wall. Overburden can be also set on the inside wall of elbow or other connecting pieces. Compared with existing technology, the heat exchanger making use of elbow compounded by and aluminium reduces wastage of copper and debases manufacturing cost of heat exchanger; it has a good compatibility with fluids such as refrigerant and anti-friction material; the connecting joints is welded by same kinds of metal. It is simple to weld the craft and the quality is reliable.

Description

technical field [0001] The invention relates to the technical field of air conditioners, in particular to the manufacturing technology using an air-cooled tube-fin heat exchanger. Background technique [0002] At present, the condensers and evaporators of many air conditioner refrigeration systems use air-cooled tube-fin heat exchangers. This heat exchanger includes several U-shaped tubes with two parallel straight tube parts and a plurality of fin groups arranged at certain intervals along the longitudinal direction of the straight tube part, and the U-shaped tubes are connected by elbows or tees. and other connectors are connected. Copper tubes and copper parts are usually used for the U-shaped tubes of the existing heat exchanger and the elbows or tees connecting the U-shaped tubes. [0003] The price of copper is high, and the use of copper pipes and copper parts as the pipeline of the refrigeration system makes the cost of the air conditioner very high. The specific ...

AI Technical Summary

Problems solved by technology

However, there are also some technical difficulties and shortcomings in the manufacture of air conditioners using aluminum refrigeration pipelines: 1. Aluminum tubes are difficult to process, and they are prone to wrinkles when bending the tubes, making the tubes scrapped or reducing the compressive strength; 2. Aluminum tube welding Difficult, easy to burn through the pipeline or weld leakage; 3. The connection between the aluminum tube and the copper parts in the refrigeration pipeline will cause galvanic corrosion due to the potential difference between the contact surfaces of different metals; 4. The aluminum tube and its contained The impurities in the refrigerant have poor compatibility with the refrigerant and lubricating oil in the refrigeration pipeline, and there are potential safety hazards in long-term use

Images