CN2396363Y

CN2396363Y - Heat transfer tube

Info

Publication number: CN2396363Y
Application number: CN 99252547
Authority: CN
Inventors: 钟立新; 范建国
Original assignee: Bailing Copper Material Group Co ltd Shaoxing
Current assignee: Bailing Copper Material Group Co ltd Shaoxing
Priority date: 1999-09-28
Filing date: 1999-09-28
Publication date: 2000-09-13
Anticipated expiration: 2009-09-28

Abstract

The utility model discloses a heat-transfer pipe of carrying out the heat exchange to two kinds of different temperature fluids, it includes a pipe, has many spiral shape on the internal surface of pipe and/or surface and swells, the slot, these are protruding and the slot has increased heat transfer area, have promoted the fluidic turbulent flow of pipe core and/or outside of tubes to heat exchange efficiency has obvious improvement.

Description

Heat-transfer pipe

The utility model relates to the heat-transfer matcrial that a kind of heat exchanger is used, and especially a kind of two kinds of fluid at differing temperatures is carried out the heat-transfer pipe that heat exchange is used.

Evaporimeter in air-conditioning, refrigerator, the refrigeration system, condenser and water heater, cooler all have two kinds of fluid at differing temperatures are carried out heat exchange in heat exchanger a process, and the strength member of heat exchanger is a heat-transfer pipe.Common in the market and heat exchanger domestic production, all adopting the copper pipe of inside and outside smooth surface is heat-transfer pipe.This ganoid heat-transfer pipe, flowing of medium is laminar flow in its pipe, has a boundary-layer at tube wall surface, laminar flow and boundary-layer will influence the heat exchange efficiency of two kinds of different temperatures fluids.Simultaneously, for reaching certain heat exchange effect, heat exchanger just needs to increase the quantity of heat-transfer pipe, causes the increase of heat exchanger volume and the consumption of heat-transfer pipe to increase.

At the problems referred to above, the purpose of this utility model provides a kind of energy enhanced heat exchange process, obviously improves heat transfer property and the little heat-transfer pipe of pipe internal pressure loss.

Heat-transfer pipe provided by the utility model, comprise a pipe, many projections, groove are arranged on this internal surface of bloom and/or outer surface, and these projections, groove have increased the heat transfer area that heat-transfer pipe contacts with fluid, and make the interior and/or mobile turbulent condition that presents of extratubal fluid of pipe of heat-transfer pipe.

Described projection, groove are spiral-shaped along the pipe range direction, and its cross section is trapezoidal or triangle or Arc Cycloid shape, perhaps other analogous shape.

Owing to adopt above-mentioned Rational structure, not only make in the pipe or extratubal fluid mobile becomes irregular turbulent condition, reduced the thickness of boundary-layer, especially spirality projection, groove make tube fluid produce rotation and mix, the temperature convergence unanimity of each the little unit of fluid in the pipe on the cross section has been strengthened heat exchanging process, and because the increase of heat transfer area, quickened the conduction of heat and distributed, thereby made heat transfer property obtain significant raising.Than light face heat-transfer pipe, heat transfer efficiency improves two times at least; The raising of heat exchanger effectiveness has improved the performance of heat exchanger, can dwindle heat exchanger volume, has saved the consumption of heat-transfer pipe, and cost performance further improves; In addition, projection, the degree of depth between groove of tube surface are less, and the pipe internal pressure loss is little.

Concrete structure of the present utility model is provided by following examples and accompanying drawing thereof.

Fig. 1 is the structural representation of the utility model heat-transfer pipe first embodiment.

Fig. 2 be Fig. 1 along A-A to the part section enlarged drawing.

Fig. 3 is the structural representation of the utility model second embodiment.

Fig. 4 be Fig. 3 along B-B to the part section enlarged drawing.

Fig. 5 is the structural representation of the utility model the 3rd embodiment.

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

As shown in Figure 1, heat-transfer pipe has the pipe 1 of a tubular, and having many on internal surface of bloom is spiral projection 2, groove 3 along the pipe range direction, as shown in Figure 2, these projections, the cross section of groove is a trapezoidal shape.When tube fluid flows from left to right, fluid near tube wall moves along spiral groove and projection, so tube fluid produces rotation, the little unit of high temperature fluid of middle region is pushed to the tube wall heat transfer in the pipe under the centrifugal action that rotation is produced, and the little unit of the fluid in tube wall district is by after the heat conductive wall heat radiation, along hand of spiral sinuous movement, tube fluid is mixed automatically, the temperature convergence unanimity of each point fluid in its tube core cross section.Again since the surface area of projection, groove obviously greater than the area of its projection on the pipe inner periphery, promptly strengthened the heat transfer area that contacts with fluid, thereby made the heat exchanger effectiveness of heat-transfer pipe can improve 30% at least than smooth pipe.

As shown in Figure 3, Figure 4, it is spirality projection 4, groove 5 along the pipe range direction that bull is arranged on the outer surface of heat-transfer pipe pipe 1, the cross section of these projections, groove is the Arc Cycloid profile of tooth, its surface area greater than it along radial direction in the outer surface of tube blank projected area, the increase of heat radiation/heat transfer area helps improving heat transfer coefficient.Simultaneously, the fluid at projection and groove place produces turbulent flow, has reduced boundary layer thickness again, help absorbing or distribute heat, thereby the heat exchanger effectiveness of this heat-transfer pipe improves about 30% than light face heat-transfer pipe.

For ease of in heat exchanger, installing, leave light face section 6 respectively at the two ends of pipe 1 outer surface, use for expansion tube process.

As shown in Figure 5, having many on the inner surface of heat-transfer pipe pipe 1 is projection 7, the groove 8 of helix along the pipe range direction, spirality shallow trench 10, projection 9 that coarse pitch is arranged on the outer surface, these shallow trench make the spirality projection on the inner surface rise and fall along helix, make the turbulent flow of tube fluid more abundant.The heat transfer efficiency of this class heat-transfer pipe can reach more than two times of smooth pipe.

Above-mentioned heat-transfer pipe can be according to different operating medium and different operating mode values, the different number of design, helical angle, pitch, the spirality projection of different cross section shape, groove.

Claims

1, the heat-transfer pipe used of a kind of heat exchanger comprises a pipe, and it is characterized in that has many projections, groove on the inner surface of pipe and/or the outer surface.

2,, it is characterized in that spiral-shaped for along the pipe range direction of described projection, groove according to the described heat-transfer pipe of claim 1.

3, according to the described heat-transfer pipe of claim 2, it is characterized in that the spirality projection can be continuous, also can be interrupted.