CN2150516Y

CN2150516Y - Metal heat-transfer tube with internal and external heat-exchange surface

Info

Publication number: CN2150516Y
Application number: CN 93238237
Authority: CN
Inventors: 戴礼良
Original assignee: Individual
Current assignee: Individual
Priority date: 1993-02-26
Filing date: 1993-02-26
Publication date: 1993-12-22
Anticipated expiration: 2003-02-26

Abstract

The utility model relates to a metal heat-transfer tube with internal and external heat-exchange surface, which is characterized in that the exterior surface of the metal tube is provided with a helical distributed fin directly cut on exterior surface; the interior surface of the metal tube is provided with a cut groove distributed in straight line or helical mode. The fin at the exterior surface of the heat-transfer tube is cut and processed in the nondestructive material mode; thus, the utility model not only enlarges the heat transfer area maximally, but also saves materials maximally; meanwhile, the heat-dispersing surface at the interior wall of the heat-transfer tube is enlarged to strengthen the heat dispersing in the tube. The utility model can be widely applied to the equipment and industrial fields which need heat dispersing or heat exchanging.

Description

Metal heat-transfer tube with internal and external heat-exchange surface

The utility model relates to a kind of metal heat transfer pipe that is used for industrial heat-exchange apparatus and place, particularly a kind of heat-transfer pipe that increases the internal-external heat exchange face.

Existing heat-transfer pipe has wrap spring type, stacked, spiral groove type and inner rib type etc., wherein spiral groove type is to open the purpose that the dissected valley groove reaches increases heat-exchange surface on tube wall, the patent that is called " bilateral intensify heat transfer pipe " as the CN88216859.2 name promptly belongs to this type of, but its heat-exchange surface is also little, wrap spring type or stacked heat-transfer pipe adopt will dispel the heat spring or the mode of fin to weld, the mode of expanded joint or pressing are wrapped on the tube wall, but because the heat transfer property of scolder and mother metal there are differences and owing to existing the gap therebetween, thereby influenced the heat conductivity of heat-transfer pipe, the patent No. is a kind of gilled tube that is used for heat exchanger of CN90207874.7, it is carved to cut at inside pipe wall and processes groove and fin, can strengthen intraductal heat transfer greatly, but outer heat transfer of pipe can not get strengthening, and is processed with certain limitation.

Directly increasing big heat-transfer area on the metal tube inside and outside wall is the maximum approach that improves metal tube heat-transfer pipe rate of heat exchange, but still finds no the comparatively desirable product of structure at present.

The purpose of this utility model just provides and directly is processed with big heat-transfer area on a kind of outer wall within it, the metal heat transfer pipe that heat transfer efficiency is highly desirable.

The utility model is to constitute like this, and promptly the outer surface machining at metal tube has fin, and fin and caliber are to being 50～90 ° of angles; The inner wall of metal tube machining has shape in the shape of a spiral or linearity to be distributed in the groove of inwall.

Said structure of the present utility model can further specify by the example that accompanying drawing provides.

The utility model has following accompanying drawing:

Accompanying drawing 1 is a front view of the present utility model;

Accompanying drawing 2 is a longitudinal section of the present utility model schematic diagram.

Referring to accompanying drawing, the fin 1 of metal tube outer surface machining and caliber be to vertical and in spiral distribution, fin number weekly, and fin pitch and fin length can be processed as required; Fin length is not less than 3:1 with the ratio of pitch, and fin thickness is looked the radiating surface that its rigidity is determined, fin can make the metal tube outer surface to be increased more than 500%.The inner wall of metal tube machining has the groove 2 of linearity, groove number and groove depth, and the helical angle during spiral distribution is all processed according to needs.When trench bottom corners is 60 °, when groove was arranged continuously, inside pipe wall enlarged heat-exchange surface more than 90%.

The utility model adopts such processing mode to process: promptly inner wall of metal tube is processed with broaching, and the fin of outer wall forms with dedicated tool and process equipment cutting thereof.

The utility model has been owing to adopted the fin outer surface, thereby greatly enlarged outer heat-transfer area; And this fin is that the cutting way processing of lossless material obtains, and economical with materials simultaneously, has increased radiating surface at inner wall of metal tube to greatest extent, when inner surface is the groove of spiral distribution, in the fluid rotation flowing pipe, has strengthened intraductal heat transfer.

The utility model can be widely used in the equipment and the industrial site that need dispel the heat or carry out heat exchange.

Claims

1, a kind of metal heat transfer pipe with internal-external heat exchange face, it is characterized in that: the outer surface of metal tube has the fin (1) that directly cuts out thereon, fin and body surface are 60～90 ° angle, and inner wall of metal tube has the groove (2) of machining.

2, metal heat transfer pipe according to claim 1 is characterized in that: fin (1) is spirally distributed in the metal tube outer surface.

3, according to claim 1,2 described metal heat transfer pipes, it is characterized in that: groove (2) linearly or spiral distribution in inner wall of metal tube.