Multi-row pit heat exchange tube

Abstract

The invention relates to a multi-row pit heat exchange tube, comprising a stainless steel tube body. The multi-row pit heat exchange tube is characterized in that the surface of the stainless steel tube body is provided with a plurality of rows of pits along an axial direction and the positions of adjacent two rows of pits are staggered. The multirow pit heat exchange tube has the advantages that: 1. the diameter of the heat exchange tube can be produced less than 5 mm while the heat exchange tube ensures the heat exchange efficiency and the heat change tube is easy to process for molding; 2. the tube body has small diameter, relatively high heat exchange surface area ratio and larger heat transfer quantity under the condition that the medium temperature and the temperature needed to be displaced are the same; and meanwhile, the pits on the stainless steel are deeper than spiral grooves on a tube body with the same diameter, thus the turbulence phenomenon of gases passing through the heat exchange tube is enlarged, the heat exchange coefficient is greatly improved and the heat exchange effect is intensified; 3. due to the small diameter of the tube body, the installation space can be saved, and compared with common heat exchange tubes, obviously less heat exchange tubes with small diameter are used in a device with same heat exchange requirements; and 4. the service life is prolonged and the pits can reduce the retention and deposition of the impurities of media in the tube compared with the spiral grooves.

Description

technical field [0001] The invention particularly relates to a multi-row dimpled heat exchange tube used in an engine cooler. Background technique [0002] Exhaust gas emitted by engines of various vehicles has become an important factor of air pollution. In order to save energy and reduce emissions, it is necessary to use heat exchange tubes with higher heat exchange efficiency and longer service life in vehicles such as automobiles and airplanes. [0003] At present, the heat exchange tubes in various vehicle engine exhaust gas recirculation coolers mainly use spiral grooved tubes. In order to improve the heat exchange efficiency, this heat exchange tube is provided with one or two spiral grooves on the tube wall. When the tube When the diameter is less than 5.0mm, it is difficult to process and shape, even if it can be formed, it is difficult to meet the process requirements, and the diameter of the pipe is too small to easily cause the precipitation of impurities in the...

AI Technical Summary

Problems solved by technology

[0003] At present, the heat exchange tubes in various vehicle engine exhaust gas recirculation coolers mainly adopt spiral grooved tubes. In order to improve the heat exchange efficiency, this kind of heat exchange tubes is provided with one or two spiral grooves on the tube wall. When the diameter is less than 5.0mm, it is difficult to process and shape, even if it can be formed, it is difficult to meet the process requirements, and the diameter of the pipe is too small to easily produce impurities in the medium in the pipe.

Therefore, the diameter of this kind of heat exchange tube is usually more than 10mm, which takes up a lot of space, and the corresponding engine cooler has a larger overall size.

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