Heat transfer pipe with radiating fin parts

Abstract

It is an object of this invention to obtain a heat conduction pipe superior in corrosion resistance as well as heat exchange efficiency between fluid flowing respectively through an inside and an outside for great heat radiation property and endothermic characteristics. It is also object of this invention to form the heat conduction pipe superior in the corrosion resistance as well as the heat radiation property and endothermic characteristics at inexpensive price. To achieve the above, at least single resin coating layer is formed on an outer circumferential surface of a metal pipe, a metal fin member is spirally wound on an outer circumferential surface of the resin coating layer with a side end surface the metal fin member in contact. The winding contact portion is made to encroach a surface of the resin coating layer to form the heat conduction pipe.

Description

technical field [0001] The present invention relates to heat transfer pipes that can be used in fluid cooling pipes for automobiles and construction machinery, air conditioners that adjust the temperature and humidity of residential spaces, and other equipment, and have corrosion resistance that can be used in corrosive environments. The heat transfer tube obtained by the invention not only has good corrosion resistance, but also can perform effective heat exchange with high heat dissipation and heat absorption characteristics. Background technique [0002] Conventionally, as heat transfer tubes having corrosion resistance, there have been heat transfer tubes as described in the following Patent Documents 1 and 2, and metal tubes such as steel tubes or aluminum tubes that have been coated with corrosion-resistant coatings such as galvanized or chromate coatings have been used. The outer peripheral surface of the tube is provided with a thermoplastic resin film layer such as ...

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Problems solved by technology

[0012] However, in the heat transfer tubes provided with the resin coating layer of Patent Documents 1 and 2, the thick resin coating layer formed in order to improve impact resistance and corrosion resistance has problems in heat dissipation and heat absorption characteristics, and it is difficult to improve the heat transfer performance. The heat exchange efficiency between the fluids flowing inside and outside the heat pipe

[0013] On the other hand, the protrusions of Patent Documents 3 to 5 are provided with heat transfer tubes made of metal material fin parts, which increases the heat transfer area and can obtain higher heat exchange performance, but the anti-corrosion coating on the surface of the metal tube is easily damaged by flow stone There is a problem in corrosion resistance due to damage due to waiting

In addition, since the fin member formed of a flat metal material and the contact portion of the metal tube are provided with corrugations, etc., and formed into a helical shape and wound on the metal tube, the spiral is generated due to the restoring force of the metal material. Twisted, the contact part of the heat sink part and the outer peripheral surface of the metal tube cannot be well bonded, and a gap is generated so that good heat transfer between the metal tube and the heat sink part cannot be obtained

[0014] In order to prevent this twisting, the two ends of the spiral fin member are fixed to the metal tube by clip fixing or screw fixing, etc., but in the manufacturing process, not only it takes a lot of man-hours, but also the gap between the fin member and the metal tube The fixation alone is not sufficient for contact

Therefore, it is necessary to close the gap between the heat sink member and the metal pipe by painting or brazing, and the work process is cumbersome, and it is difficult to improve production efficiency.

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