CN2144290Y

CN2144290Y - High-efficient fin screw-thread heat transfer pipe

Info

Publication number: CN2144290Y
Application number: CN92235193U
Authority: CN
Inventors: 谭伟雄
Original assignee: Individual
Current assignee: Individual
Priority date: 1992-11-05
Filing date: 1992-11-05
Publication date: 1993-10-20
Anticipated expiration: 2002-11-05

Abstract

The utility model relates to a circular or elliptical screw-shaped heat-transfer pipe with fins, belonging to the technical field of enhanced heat transfer and energy saving. The inner and the outer of the heat-transfer pipe are both rolled into spiral grooves, and meanwhile, a fin band is pressed and welded in the groove of the outer surface of the heat-transfer pipe. The heat-transfer pipe with obvious function of enhanced heat transfer can be used as the heat-transfer pipe on air-cooled heat exchangers, heat pipes, radiators, etc. in the field of petroleum, chemical industry and civil architecture.

Description

High-efficient fin screw-thread heat transfer pipe

The utility model belongs to augmentation of heat transfer and field of energy-saving technology.

At present, be on garden pipe or surface, pipe place, ellipse garden generally at the fin heat transfer pipe that uses on air cooler and the radiator, string overlaps blocks of fin or around the fin band, with the increase heat transfer area, but pipe internal surface still is a light pipe, its augmentation of heat transfer DeGrain.And for example Chinese patent application CN2085050U discloses a kind of " interior ripple screwed pipe heat transfer element ", promptly thread groove is arranged in that pipe surfaces externally and internally in garden is rolling, and wherein the interior ripple of inside pipe wall makes medium disturbance in the pipe, and augmentation of heat transfer is had certain effect.But manage outer non-finned, heat transfer area is little, and incompatibility is used for the heat-transfer pipe on air cooler and the radiator.

The purpose of this utility model is the deficiency that overcomes above-mentioned prior art, obtains a kind of screw thread heat-transfer pipe that has fin garden shape or ellipse garden shape.This pipe can make the medium in the pipe be strengthened, and manages outer heat-transfer area and amasss big.Especially be with shape screw thread heat-transfer pipe pipe outer pressure drop in the ellipse garden of fin can reduce 30%, its heat-transfer effect is more obvious.

To achieve these goals, the utility model is achieved in that the surfaces externally and internally of this heat-transfer pipe is all rolling pitch, the wall scroll that lead angle is identical or many spiral grooves.The cross section of wherein managing the spiral tongue is a garden arc curve, and the cross section of pipe external spiral connected in star is the U-shaped curve, and fin pressure welding simultaneously is in pipe external spiral U-shaped groove, and its movement locus is consistent with heat-transfer pipe outer wall helicla flute movement locus.

Below in conjunction with accompanying drawing the utility model is further described.

Fig. 1 is the utility model garden shape screw thread heat transfer tube configuration schematic diagram.

Fig. 2 is the partial enlarged drawing of I portion among Fig. 1.

Fig. 3 is A-A cutaway view among Fig. 1.

Fig. 4 is for the utility model is used as cold, warm Application Of Radiator example.

As shown in Figure 1, 2, 3, be that the rolling garden pipe that wall scroll or many spiral grooves is arranged or will roll spiral groove again rolls, is pressed into ellipse garden shape on the surfaces externally and internally of garden pipe.With petal type corrugated fin band, the helical groove on garden shape or ellipse garden shape tube outer surface makes the root of fin band press, be welded in the U-lag then.So just having finished band fin garden shape or ellipse garden shape screw thread heat-transfer pipe makes.

As shown in Figure 4, be finned garden shape or the ellipse garden shape screw thread heat-transfer pipe (1) that will make, by the welding or expanded joint to the tube sheet (5) at heat-transfer pipe two ends.Make it constitute a flow cycle back and forth, with taking metal or the nonmetal cover (3) of gas port (2) out of heat-transfer pipe covered then with air intake (4), when cold air or heating installation by in the heat-transfer pipe time, thereby reach efficiently cold, warm purpose.

The utility model band fin screw thread heat-transfer pipe can make fluid be subjected to the guiding of helicla flute line when flowing in pipe, makes the segment fluid flow crossheading of close wall rotate; Part fluid moves vertically along wall, and spiral projection also makes fluid produce periodic disturbance, and preceding a kind of effect helps the attenuate fluid boundary layer; The back is a kind of to act on the disturbance that can cause fluid particle in the boundary layer, thereby can accelerate by the heat transmission of wall to bodies of fluid.The groove depth (e) of this band fin garden shape or ellipse garden shape screw thread heat-transfer pipe is between 0.02 to 0.2 with the scope of the ratio e/d of relative garden bore (d), helical pitch (p) is between 0.1 to 2 with the scope of the ratio p/d of relative garden bore (d), and lead angle α is between 0 °＜30 °.Especially the wall scroll band fin garden shape of minor spiral lift angle (α) or ellipse garden shape screw thread heat-transfer pipe are comparatively favourable.

Compared with the prior art, the utility model is owing to pressure welding in the U-shaped groove outside protruding spiral groove all being arranged at pipe internal surface and managing has petal type corrugated fin band, perhaps corrugated fin band, perhaps petal type fin band, heat-transfer effect is got improve, in same process condition, same model, in the situation of size, improve 2 to 3 times of augmentation of heat transfer coefficients than light pipe finned tube.

Claims

1, high-efficiency fin screw thread heat-transfer pipe is characterized in that:

A, wall scroll or many spiral grooves are arranged in that the surfaces externally and internally of garden shape or ellipse garden metal shape heat-transfer pipe is all rolling;

B, all pressure welding has the fin band in heat-transfer pipe outer surface spiral groove.

2, according to the heat-transfer pipe shown in the claim 1, the groove depth (e) that it is characterized in that heat-transfer pipe is between 0.02 to 0.2 with the scope of the ratio e/d of relative garden bore (d).

3, the heat-transfer pipe that shows according to claim 1, the lead angle α that it is characterized in that heat-transfer pipe is in 0 °＜30 ° scope.

4, according to the heat-transfer pipe shown in the claim 1, the helical pitch (p) that it is characterized in that heat-transfer pipe is between 0.1 to 2 with the scope of the ratio p/d of relative garden bore (d).

5, according to the heat-transfer pipe shown in the claim 1, it is characterized in that the cross section of heat-transfer pipe inner surface convex ripple is the garden arc curve, the cross section of heat-transfer pipe outer surface spill ripple is the U-shaped curve.

6,, it is characterized in that the fin band is a petal type corrugated fin band, corrugated fin band or petal type fin band according to the heat-transfer pipe shown in the claim 1.