CN202304544U

CN202304544U - Heat transfer fin for plate-fin heat exchanger

Info

Publication number: CN202304544U
Application number: CN2011203843896U
Authority: CN
Inventors: 强载炎; 王明志
Original assignee: Hangzhou Hangyang Co Ltd
Current assignee: Hangzhou Oxygen Plant Group Co Ltd
Priority date: 2011-10-11
Filing date: 2011-10-11
Publication date: 2012-07-04
Anticipated expiration: 2021-10-11

Abstract

The utility model discloses a heat transfer fin for a plate-fin heat exchange and the manufacture of the heat transfer fin. The flow channel curve of the heat transfer fin is sine-shaped, namely the flow channel curve of the heat transfer fin is a continuous function curve which is consistent with a curve functional expression, wherein the flow velocity, heat transfer performance and resistance of fluid can be changed only by changing amplitude A or a period T. The heat transfer fin is manufactured by punching an aluminum foil. The width direction of the punched aluminum foil is taken as the direction of an independent variable x, and the functional expression of the flow channel curve of the heat transfer fin can be obtained. The heat transfer fin has height H of 9.5, pitch P of 1.0 and material thickness t of 0.15. The period of the sine curve y=Asinx is 2phi. The heat transfer fin has the characteristics of simple structure, convenience for manufacture, operational reliability and the like, and the heat transfer area and flow resistance of the heat transfer fin are between those of the two conventional heat transfer fins, and can be selected according to design.

Description

A kind of thermofin of plate-fin heat exchanger

Technical field

The utility model relates to a kind of thermofin of plate-fin heat exchanger, belong to the manufacturing technology field of heat transmission equipment.

Background technology

Core part in the plate-fin heat exchanger---thermofin roughly has two big types of forms at present at home: a kind of is square flute profile (J) thermofin (seeing shown in Figure 1); Another kind is that flat type (P) comprises porous type (D) thermofin (seeing shown in Figure 2), and the porous type fin is the hole of the certain percent opening of punching out on the paper tinsel material in advance before punching out is shaped, and then punching out becomes fin shape shown in Figure 2.Square flute profile (J) is though its heat transfer area of thermofin is bigger, and its circulating resistance is also bigger; And flat type (P) comprises porous type (D) though its circulating resistance of thermofin is less, and its heat transfer area is also less.Among Fig. 1

Figure 2011203843896100002DEST_PATH_IMAGE002

.

Summary of the invention

The purpose of the utility model is to overcome the deficiency that prior art exists, and provides a kind of heat transfer area and circulating resistance between existing two quasi-tradition type thermofins, also can supply the thermofin of the plate-fin heat exchanger of design alternative.

The purpose of the utility model is accomplished through following technical scheme; The passage curve of described thermofin is a sinusoidal waveform, is the continuous function curve that satisfies following curvilinear function formula:

Figure 2011203843896100002DEST_PATH_IMAGE004

; Wherein, just can change flow rate of fluid, heat transfer property and resistance as long as change amplitude A or cycle T.

Described thermofin is to form with the aluminium foil punching out; Width with the punching out aluminium foil is an independent variable x direction, and the functional expression of the passage curve of thermofin is:

.

Described thermofin height H=9.5, pitch P=1.0, expect thick t=0.15; Waveform is the sine curve of y=Asinx, and the cycle is 2 π.

The described sinusoidal waveform thermofin of the utility model has following manufacturability advantage and design advantage,

One, the manufacturability advantage of sinusoidal waveform thermofin is:

1. can improve effectively and prevent under the condition of high temperature of vacuum brazing because the rigidity of fin is not enough, cause the fin unstability and after causing vacuum brazing product recessed phenomenon takes place easily;

If the higher aluminium foil of the fin height in the plate-fin heat exchanger is thinner again, recessed phenomenon takes place in product easily after vacuum brazing.This is because the rigidity of fin is not enough, unstability under the condition of high temperature, cause that fin subsides due to.From recessed in the past product; And the square flute profile (J) of equal height, same pitch, same material thickness and straight porous type (D) fin done the contrast of cold conditions compression test; Can find out: for the anti-unstability performance of fin, square flute profile (J) is better than straight porous type (D); This is because square flute profile (J) fin is bigger than porous type (D) at actual compression area when receiving resistance to compression, and the compression area of sinusoidal waveform fin according to the invention is bigger than square flute profile (J), so has better anti-unstability performance;

2. can make full use of modern CNC processing technology and make the mould of fin,

The mould of sinusoidal waveform thermofin can utilize " cutting of the gesture of being careful line " CNC processing technology to realize.Add man-hour as long as, import " cutting of the gesture of being careful line " numerical control machine tool, just can process the mould of sine wave curve by procedure of mould design mathematical model establishment.And the roughness of mould can reach 0.8 after " cutting of the gesture of being careful line " processing, does not need to process through grinding machine again, can satisfy the requirement of punching out fin fully.

3. the fin surface quality behind the punch forming is better,

The forming technology of sinusoidal waveform thermofin is to force foil under the state that percentage elongation allows, the technical process of the plastic deformation through three-dimensional bending.In plastic history, fin material receives unidirectional tension and bi-directional compression stress, and this is quite favourable to plastic deformation, so forming process is controlled easily, the fin residual deformation amount after the moulding is little, thereby springback capacity is minimum.In addition, because sine wave is a continuous function curve, knee of curve changes relatively slowly and is level and smooth.Therefore, material is difficult for arching and wrinkling in the process, and the fin surface quality behind the punch forming is better.

Two, the design advantage of sinusoidal waveform thermofin is: the fin specification that the present invention designs and develops is preferably: 95B10015/ π, promptly fin height H=9.5, pitch P=1.0, expect thick t=0.15; Waveform is the sine curve of y=Asinx, and the cycle is 2 π; This fin is through simulated test, and effect is better.

The sinusoidal waveform thermofin has following design advantage at least:

1. the runner damping is little, so energy loss is few;

2. the amplitude A of adjustment SIN function just can change the turbulent flow of fluid in runner.Therefore when amplitude A increased, the heat transfer efficiency of fin can increase thereupon, and flow resistance also can increase; Otherwise when amplitude A reduced, the heat transfer efficiency of fin can descend, and flow resistance also can reduce thereupon;

3. when increasing the cycle T of SIN function, flow rate of fluid has tangible quickening; Flow resistance also can obviously reduce;

4. through changing the amplitude A and the cycle T of SIN function, can develop the sinusoidal waveform fins of series, supply design Selection.

Description of drawings

Fig. 1 is existing square flute profile fin sectional view;

Fig. 2 is existing straight porous type fin sectional view;

Fig. 3 is the sketch map of the said sinusoidal waveform fin of the utility model;

Fig. 4 is the oscillogram of the said sinusoidal waveform fin of the utility model;

The specific embodiment

To combine accompanying drawing that the utility model is done detailed introduction below: shown in Figure 3; The passage curve 1 of the described thermofin of the utility model is a sinusoidal waveform, is the continuous function curve that satisfies following curvilinear function formula: ; Wherein, just can change flow rate of fluid, heat transfer property and resistance as long as change amplitude A or cycle T.Concrete sine-shaped oscillogram is seen shown in Figure 4.

Thermofin shown in Fig. 3 is to form with the aluminium foil punching out; Specifically the width with the punching out aluminium foil is an independent variable x direction, and the functional expression of the passage curve of thermofin is:

.

The letter that is marked in the accompanying drawing 1,2,3,4 is the conventional dimensioning symbol of thermofin except explanation is arranged, by those skilled in the art are familiar with also on top of.

Shown in the figure is preferred version, and promptly the thermofin of described plate-fin heat exchanger is characterized in that described thermofin height H=9.5, pitch P=1.0, expects thick t=0.15; Waveform is the sine curve of y=Asinx, and the cycle is 2 π.

The preparation of the described thermofin of the utility model; This preparation technology is: the mould that at first utilizes existing " cutting of the gesture of being careful line " CNC processing technology processing sinusoidal waveform thermofin; As long as promptly add man-hour according to procedure of mould design mathematical model establishment, input " cutting of the gesture of being careful line " numerical control machine tool is processed the moulding mould special of sinusoidal waveform thermofin; Next selects foil for use; Through the plastic deformation process of described moulding mould special through three-dimensional bending; Promptly in plastic history; Foil receives unidirectional tension and bi-directional compression stress, processes the passage curve that a continuous function curve and knee of curve change slower and level and smooth thermofin.

The innovative point of the utility model is:

1. the 95B10015/ π sinusoidal waveform thermofin of the utility model development and Design; Tooth Shape Design becomes sine curve; Width with the punching out aluminium foil is an independent variable x direction, the functional expression of curve:

is continuous function.Therefore, be very beneficial for mould and on Digit Control Machine Tool, process, thus the machining accuracy of assurance mould.

2. for seeking a kind of fin: compare some heat transfer efficiencys of suitable reduction with serrated fin and reduce its circulating resistance.The 95B10015/ π sinusoidal waveform thermofin of development and Design of the present invention shows through the result that performance test draws:

1.. the heat transfer factor j of this fin is average littler by 13% than serrated fin, but resistance coefficient f is little by about 35%.

2.. the heat transfer factor j of this fin is bigger by 25% ~ 30% than porous type fin, but about resistance coefficient f is twice.

3. suitably increase or reduce the variation that the amplitude A in the curvilinear function formula can be brought the j factor and the f factor, this provides bigger design alternative space just for the design alternative fin.

4. through the preferred 95B10015/ π of the utility model sinusoidal waveform thermofin and 95J1202/30 square serrated fin being made the compression test contrast of cold conditions, result: the anti-pressure stable average out to of 95B10015/ π 11775N; The anti-pressure stable average out to of 95J1202/30 8120N.So, adopt the 95B10015 wave-shaped fins can effectively prevent the technology difficult problem that brazing filler metal is recessed.

Claims

1. the thermofin of a plate-fin heat exchanger; The passage curve that it is characterized in that described thermofin is a sinusoidal waveform, is the continuous function curve that satisfies following curvilinear function formula:

Figure 2011203843896100001DEST_PATH_IMAGE002

2. require the thermofin of 1 described plate-fin heat exchanger according to claim; It is characterized in that described thermofin is to form with the aluminium foil punching out; Width with the punching out aluminium foil is an independent variable x direction, and the functional expression of the passage curve of thermofin is:

.

3. the thermofin of plate-fin heat exchanger according to claim 1 and 2 is characterized in that described thermofin height H=9.5, pitch P=1.0, expects thick t=0.15; Waveform is the sine curve of y=Asinx, and the cycle is 2 π.