Heat exchanger, method of manufacturing a heat exchanger and air conditioner with the heat exchanger

Abstract

The present invention provides a heat exchanger, which is improved in terms of heat transfer efficiency and space saving, which can be manufactured with simplified steps and at a reduced cost, and which ensures improved reliability when used, a method for manufacturing the heat exchanger, and an air conditioner including the heat exchanger. The heat exchanger includes: a plurality of plate fins, made of an aluminum alloy, subjected to a hydrophilic film forming treatment, and stacked at predetermined intervals to allow air to flow therebetween; and a flat heat transmission tube, made of an aluminum alloy and provided with a plurality of refrigerant flow paths arranged in a major axis direction of the tube so as to extend in a longitudinal direction of the tube; wherein the heat transmission tube is fitted into grooves provided in the plate fins, and a solder layer provided on an outer surface of the heat transmission tube at a front edge thereof is melted such that the heat transmission tube is fixedly secured to the plate fins by the solder.

Description

technical field [0001] The present invention relates to a heat exchanger composed of plate fins and heat transfer tubes, a manufacturing method thereof, and an air conditioner equipped with the heat exchanger, wherein the plate fins are stacked at predetermined intervals so that air flows between them. The heat transfer tubes are formed of flat tubes provided with a plurality of refrigerant flow paths and incorporated into plate-shaped fins. Background technique [0002] In the conventional manufacturing method of heat exchangers using flat tubes made of aluminum alloy, the flat tubes are welded to the flat tubes with aluminum alloy brazing filler metal to prevent the flat tubes from not joining the corrugated fins during the brazing process. (For example, refer to Patent Document 1). [0003] In addition, there is also a method of manufacturing a heat exchanger in which, on the surface of a flat heat exchange tube formed by extrusion of aluminum alloy, forming The formed ...

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Problems solved by technology

[0006] According to the technology described in Patent Document 1, the fin pitch is large, and there is a problem that the heat exchanger needs to be enlarged in order to obtain a predetermined heat exchange performance.

[0007] In addition, although the heat exchanger described in Patent Document 2 has high heat exchanging performance, since the flat heat exchange tubes are brazed to the plate-shaped fins at high temperature, it is necessary to carry out heat transfer for the plate-shaped fins after molding the heat exchanger. Hydrophilic treatment, in this way, there is a problem that the production cost increases due to the addition of expensive surface treatment processing steps

[0008] Moreover, when inserting the flat heat exchange tubes coated with brazing material in advance into the grooves of the plate fins, since the gap between the grooves of the plate fins and the flat heat exchange tubes is small, there is Problems such as deformation of the plate heat sink when inserted, or solder solder adhering to the surface treatment coating of the plate heat sink, reducing the hydrophilic effect of the plate heat sink, etc.

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