Heat exchange tube with inner fins and heat exchanger

Abstract

The invention relates to a heat exchange tube with inner fins and a heat exchanger. The heat exchange tube comprises a tube body, wherein the section of the tube body is in a strip rectangular shape. Multiple paired strip-shaped concave portions in the motion direction of fluid in the tube are correspondingly arranged on the upper face and the lower face in the tube body, and the multiple strip-shaped concave portions form strip-shaped protrusions on the outer surface of the tube body. At least one fin with point protrusions or short-line-shaped protrusions is connected in the up-and-down corresponding strip-shaped concave portions. According to the heat exchange tube, by means of the manner of arranging the cooling fins in the heat exchange tube, a heat transfer face is increased, the fins serve as a secondary heat transfer face, hot air flow heats the fins, and heat on the fins is transmitted into cooling liquid through the strip-shaped protrusions while being transmitted to the surface of the heat exchange tube through the strip-shaped protrusions on the heat exchange tube; and the point-shaped or short-line-shaped protrusions arranged on the fins can stir and disturb flowing air, carbon deposition is avoided, and the heat exchange efficiency is improved. Due to the fact that the tube body and the fins can be produced in a stamped manner, on the premise of meeting the heat exchange requirement, fin arrangement can be reduced, the fins are reduced, welding points are few, reliability is improved, welding is quite convenient, the heat exchange tube is suitable for mass production, and the beneficial effect of being low in manufacturing cost is achieved.

Description

technical field [0001] The invention relates to a heat exchange tube and a heat exchanger with inner fins, which are equipment used in automobile engines, equipment used in engine facilities, and heat exchange equipment used in engine EGR systems. equipment. Background technique [0002] For heat exchangers, improving heat exchange efficiency and reducing the volume of heat exchangers has always been the direction and subject of research in the industry, especially for heat exchangers applied to automobile engines, maintaining or increasing heat exchange efficiency as much as possible Under the premise, it is more important to reduce the volume of the heat exchanger. At the same time, it is necessary to consider the technological performance of the product and whether it meets the needs of mass production. [0003] There are basically two types of traditional heat exchangers: plate-fin heat exchangers and shell-and-tube heat exchangers, each of which has its own advantages...

AI Technical Summary

Problems solved by technology

This type of heat exchanger is relatively small in size and high in heat exchange efficiency, but its structure is complex and its manufacturing cost is high

[0006] The traditional plate-fin heat exchanger is usually designed with integral fins, and the fins are straight in the axial direction. With the improvement of the engine's performance requirements for the exhaust gas recirculation cooler, in a limited space, the corrugated heat exchanger can be used Integral fins are used to improve heat exchange efficiency, but the spacing of the fins must be continuously reduced to achieve high performance, which may cause blockage between the fins in the case of carbon deposits, so that the performance of the cooler cannot be effectively improved In addition, because there are many contact points between fins and flat tubes or partitions, that is, there are many welding points, failures are prone to occur. In the case of fins falling off, it will also have a greater impact on heat transfer performance.

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