Coaxial heat exchanger

Abstract

The invention provides a coaxial heat exchanger. The coaxial heat exchanger comprises an outer tube and an inner tube which are sleeved coaxially; the main body section of the inner tube is a multi-head spiral tube with a plurality of parallel spiral slot structures; both ends of the inner tube are used as a first fluid inlet and a first fluid outlet respectively; both ends of the outer tube are used as a second fluid inlet and a second fluid outlet respectively; a first fluid passageway is formed in the inner tube; a second fluid passageway consisting of a plurality of parallel spiral slots is formed between the outer tube and the inner tube; the second fluid passageway uniformly encircles the first fluid passageway; first fluid flows into the inner tube and flows out of the inner tube through the first fluid passageway; second fluid flows in the second fluid passageway; and the two kinds of fluid flows reversely so as to exchange heat through the tube wall of the inner tube. The coaxial heat exchanger provided by the invention has a large heat exchange area and high heat exchange efficiency; and the metal consumption of unit heat exchange area is low and the volume of the heat exchanger can be reduced, so the whole structure is compact and rational, and the coaxial heat exchanger is easy and convenient to operate and install.

Description

technical field [0001] The invention relates to a heat exchange device, in particular to a coaxial heat exchanger for water source / ground source and heat pump water heater. Background technique [0002] The coaxial heat exchanger has excellent heat transfer performance and is a general-purpose equipment widely used in refrigeration and air conditioning, chemical industry, power and other fields. At present, the casing heat exchangers used in the market have a simple structure and are easy to process, but the heat exchange metal consumption per unit area is large, and the manufacturing cost is relatively high. Some casing heat exchangers are made of knurled or Fin design, although the heat exchange metal consumption per unit area has been reduced, but the manufacturing cost is still high. Therefore, effectively reducing the metal consumption per unit area has become a key technology in the manufacture of heat exchangers. [0003] In addition, the heat exchanger is also a ma...

AI Technical Summary

Problems solved by technology

At present, the casing heat exchangers used in the market have a simple structure and are easy to process, but the heat exchange metal consumption per unit area is large, and the manufacturing cost is relatively high. Some casing heat exchangers are made of knurled or Fin design, although the heat transfer metal consumption per unit area has been reduced, but the manufacturing cost is still high

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