Novel high-efficiency heat exchange pipe for condenser of electric refrigeration unit

Abstract

The invention discloses a novel high-efficiency heat exchange pipe for the condenser of an electric refrigeration unit. The heat exchange pipe comprises a smooth pipe (7), a fin section (9) and a transition section (8) with a spiral fin. The heat exchange pipe is characterized in that the outside of the pipe body (1) of the fin section is provided with a spiral fin (2) which extends along the outer surface of the pipe body in a spiral manner; the outer diameter of the fin (2) is not more than that of the smooth pipe (7), the top (2B) of the spiral fin (2) is thinner than the root (2A), the upper ends of two side surfaces are smooth surfaces (3), the middle of the each side surface is provided with an inclined fin (4) which is 30-70 degrees to the pipe axis; the upper surface of each inclined fin (4) is a platform or an inclined plane, the side surfaces (4A, 4B) are trapezoidal, and one side surface (4A) is larger than the other opposite side surface (4B). The outside pipe condensation and heat exchange of the invention are reinforced; the discharge space of the condensate liquid is increased so that the condensate liquid can be fast discharged and the condensate liquid film can be expanded easily; and the turbulent flow and heat exchange in the pipe are reinforced so that the overall heat transfer efficiency can be obviously increased.

Description

Technical field: [0001] The invention relates to a heat exchange tube for a condenser of an electric refrigeration unit, in particular to a heat exchange tube for enhancing condensation heat transfer and convective heat transfer, and belongs to the technical field of heat exchange components. Background technique: [0002] In the field of refrigeration and air conditioning, the energy consumption of electric refrigeration units is mainly concentrated on the compressor, condenser and evaporator. The efficiency of the condenser directly affects the energy consumption of the entire system. The most widely used form of condenser is shell-and-tube heat exchange. The refrigerant is condensed outside the tube for heat exchange, and the inside of the tube is convective heat exchange for cooling water. The existing condensing pipes are mainly processed into fins on the outer surface by machining, and gear grooves are rolled on the top of the fins to form sharp points through serrati...

AI Technical Summary

Problems solved by technology

Since the heat exchange tubes of the condenser of the electric refrigeration unit are in the form of film condensation, as the heat flux increases, the thickness of the liquid film increases, especially in the tube bundle arrangement, the upper condensate falls on the lower tube, which seriously increases the retention angle of the liquid film , is not conducive to the drainage of condensate, the heat exchange tube disclosed in Chinese patent 101004337A (application number 200710036470.3), the inter-wing cross fins, because the inter-wing cross fins are on the same straight line and connected to each other, resistance to the flow of condensate is generated, especially It is a refrigerant with high viscosity, and the heat transfer performance is reduced

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