Heat exchanger tube with tumbling toy-shaped passages and heat exchanger using the same

Abstract

The invention provides a pipe for a heat exchanger having a multi-cylindrical combined flow path and a heat exchanger using the pipe. For the method of increasing the heat transfer area as one of the methods of improving the performance of the heat exchanger, the present invention can maintain a certain pipe wall thickness even if a small hydraulic diameter is formed, thereby reducing the weight of the pipe and the unit cost of manufacture, Moreover, the operating pressure of the heat exchange medium is not concentrated on a part of the refrigerant flow path, but it is uniformly distributed to ensure sufficient compressive strength, and carbon dioxide can be used to fully replace the heat exchange medium, and, in the When the pipe is used in the condenser, the film thickness of the condensate is reduced by the turbulent flow promoting structure facing each other in the refrigerant flow path, and the heat transfer efficiency can be improved. In addition, since the turbulent flow promoting structure is Since the top faces are opposed to each other, the turbulent flow of the refrigerant passing through the refrigerant flow path can be further promoted, and the heat transfer performance can be improved. The pipe for heat exchanger has: a flat body having a certain length in the directions of length, height, and width; and a refrigerant flow path passing through the body along the length direction. a plurality of inner channels formed by a curved portion and a second curved portion, and a plurality of outer channels located at the outermost ends of the inner channel, wherein the first curved portion causes a predetermined curve to exhibit at least one curvature change, A curvature change point protruding in the width direction of the main body is formed, and a turbulence promoting structure is formed by using the curvature change point, the second curved portion is symmetrical to the first curved portion in the width direction, The first curved parts are smoothly connected to form a closed curved surface.

Description

technical field [0001] The present invention relates to a tube for a heat exchanger having a combined multi-cylindrical surface flow path and a heat exchanger using the tube. Background technique [0002] Generally, the components of the air conditioner for automobiles include a heat exchanger, for example, a condenser that liquefies the high-temperature and high-pressure refrigerant sent from the compressor by exchanging heat with outside air, and a condenser that converts the refrigerant into Low temperature gas state, evaporator used to cool the surrounding air, etc. [0003] These condensers and evaporators are equipped with: a refrigerant flow pipe through which the refrigerant passes, a corrugated fin provided on the pipe, and a radiator arranged to communicate with both ends of the pipe. A header tank, and inflow and outflow pipes provided on the upper and lower radiator tanks for inflow and outflow of the refrigerant. [0004] However, some of the condensers in the...

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Problems solved by technology

[0012] However, the above-mentioned prior art has the problem that the heat transfer efficiency cannot be improved.

[0013] Moreover, in the above-mentioned prior art, in the manufacturing process of the pipe, when the extrusion process is carried out, when the extrusion speed is increased beyond a certain value, micropores (pinholes) will be generated on the outer surface of the pipe. During the brazing process of the heat exchanger, the pores cannot be blocked, so a bad heat exchanger will be produced

[0014] Therefore, since the extrusion speed of the pipe cannot be increased beyond a certain value in order to manufacture a high-quality heat exchanger, there is a problem of low production efficiency.

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