CN201828177U - Flat pipe and fin structure of parallel flow heat exchanger - Google Patents

Abstract

The utility model discloses a flat pipe and fin structure of a parallel flow heat exchanger. A plurality of flat pipes are inserted onto collecting pipes at two ends; and a fin is arranged between adjacent flat pipes; the sections of the flat pipes are wedge-shaped, and correspondingly, the fin between adjacent flat pipes has a tapered structure with one narrow end and one wide end. After assembly braze welding is finished, the fins can be kept fixed on the transverse direction, so that the falling off the fins can be effectively avoided due to transverse displacement of the fins; the contact faces between the fins and the flat pipes change from large to small along the narrow end to the wide end of the fins, and the welding spots between both make the same change, so that residual solder after melting during braze welding can be smoothly discharged along the wedge-shaped slopes of the flat pipes, therefore, the possibility of corroding products is reduced; and during use, condensing water on the fins and the flat pipes can be smoothly drained along the wedge-shaped slopes of the flat pipes, therefore, the possibility of corroding the products is reduced.

Description

The flat tube of parallel-flow heat exchanger and fin structure

Technical field

The utility model relates to a kind of parts of parallel-flow heat exchanger, specifically relates to a kind of flat tube and fin structure of parallel-flow heat exchanger.

Background technology

Parallel-flow heat exchanger is an equipment of realizing that heat transmits between cold fluid and hot fluid, is widely used in fields such as HVAC.Parallel-flow heat exchanger generally comprises two headers that are parallel to each other, and is provided with some parallel substantially heat radiating flat tubes between two headers, and soldering has the heat transmission fin between adjacent flat tube.Fin is processed by aluminium matter sheeting, is wave structure more, and the lateral surface of its crest and trough supports and is located on the two sides up and down of flat tube, and final soldering is fixed.Mostly existing heat radiating flat tube is the flat structure of consistency of thickness; like this because fin and flat tube just are abutted against the frictional force of touching; the phenomenon that some fins come off takes place in regular meeting in welding process or after the welding; particularly at some large-scale heat exchangers; go sticking fixing or the secondary welding etc. of mending all can occur welding unreliable and the stifled more high defective of product weldering again; the fraction defective of product is higher relatively, also makes the corresponding increase of manufacturing cost.After heat exchanger was using for many years, the solder joint of fin and flat tube is corroded or the quilt vibrations are ftractureed etc. can make all that also fin comes off in addition.These all can reduce the heat exchange efficiency of whole heat exchanger.

Summary of the invention

The utility model mainly is to solve above-mentioned existing in prior technology technical problem, and a kind of flat tube and fin structure of parallel-flow heat exchanger is provided.

Above-mentioned technical problem of the present utility model is mainly solved by following technical proposals: a kind of flat tube of parallel-flow heat exchanger and fin structure, some flat tubes are plugged on the header at two ends, be provided with fin between adjacent flat tube, the cross section of described flat tube is wedge shape, fin between adjacent accordingly flat tube is the wide grading structure of the narrow end of an end, and wherein the cross section waveform of fin satisfies:

In the formula, L is the length of run of fin cross section waveform one-period, and R is the radius of curvature of fin cross section waveform, and H is the height of fin cross section waveform, and α is the slanted angle of fin cross section waveform main body.

As preferably, the slanted angle α of fin cross section waveform main body is very little usually, even is 0 degree, and the cross section waveform of fin just can satisfy approx like this: L=R π+H-2R.

Described cross section is in the flat tube of wedge shape, and along flat tube gradual change direction from narrow to wide, the cross section in hole, microchannel is ascending; And ascending along hole, microchannel cross section, the wall thickness of flat tube increases gradually.

As preferably, the wall thickness of described flat tube increases satisfied gradually

In the formula, k is the breakdown strength value of design, and δ is the wall thickness in hole, the corresponding microchannel of flat tube, and d is the diameter in this hole, microchannel, and σ is the intensity of material.

The utility model is designed to the structure that cross section is wedge shape with flat tube, fin between adjacent accordingly flat tube is the wide structure of the narrow end of an end, after assembling and soldering is finished, can be so that fin be maintained fixed in the horizontal, can avoid fin laterally to move effectively and come off; Along fin by narrow end to wide end, contact-making surface between fin and flat tube is descending, solder joint between the two also is descending variation, and the excess solder after the fusion can emit smoothly along the wedge shape inclined-plane of flat tube in brazing process like this, reduces the possibility of its corrode product; In the use, the condensed water on the fin and on the flat tube can emit smoothly along the wedge shape inclined-plane of flat tube, reduces the possibility of its corrosion products.These can both guarantee that fin can not come off and product leakage, keep the heat exchange efficiency of whole heat exchanger, and whole processing and manufacturing is also convenient a lot, can improve the acceptance rate of the assembling processing of heat exchanger.Have characteristics such as simple in structure, reasonable in design.

Description of drawings

Fig. 1 is a kind of structural representation of the utility model heat exchanger;

Fig. 2 is a kind of structural representation of the utility model flat tube and fin;

Fig. 3 is a kind of structural representation of the utility model fin;

Fig. 4 is a kind of structural representation of the utility model fin cross section waveform.

The specific embodiment

Below by embodiment, and in conjunction with the accompanying drawings, the technical solution of the utility model is described in further detail.

Embodiment: referring to Fig. 1 and Fig. 2, the utility model heat exchanger comprises some flat tubes 2 that are plugged on the two ends header 1, and 2 of adjacent flat tubes are provided with fin 3, and the microchannel 4 on the flat tube 2 is communicated with the header 1 at two ends.Wherein the cross section of flat tube 2 is wedge shape, and the fin 3 that adjacent accordingly flat tube is 2 is the wide structure of the narrow end of an end, and wherein the cross section waveform of fin satisfies:

In the formula, L is the length of run of fin cross section waveform one-period, and R is the radius of curvature of fin cross section waveform, and H is the height of fin cross section waveform, and α is the slanted angle of fin cross section waveform main body.Normally the slanted angle α of fin cross section waveform main body is very little, even is 0 degree, and the cross section waveform of fin just can satisfy approx like this: L=R π+H-2R.Bad phenomenon such as crooked or fan-shaped can not appear in the whole high conformity of the fin of machine-shaping like this.Cross section is in the flat tube of wedge shape, and along flat tube gradual change direction from narrow to wide, the cross section in hole, microchannel is ascending; And ascending along hole, microchannel cross section, the wall thickness of flat tube increases gradually, and the wall thickness of flat tube increases satisfied gradually

In the formula, k is the breakdown strength value of design, and δ is the wall thickness in hole, the corresponding microchannel of flat tube, and d is the diameter in this hole, microchannel, and σ is the intensity of material.Taking into full account on the basis of radiating efficiency, guaranteed the mechanical strength of flat tube again.

The utility model is designed to the structure that cross section is wedge shape with flat tube, fin between adjacent accordingly flat tube is the wide structure of the narrow end of an end, after assembling and soldering is finished, can be so that fin be maintained fixed in the horizontal, can avoid fin laterally to move effectively and come off; Along fin by narrow end to wide end, contact-making surface between fin and flat tube is descending, solder joint between the two also is descending variation, and the excess solder after the fusion can emit smoothly along the wedge shape inclined-plane of flat tube in brazing process like this, reduces the possibility of its corrode product; In the use, the condensed water on the fin and on the flat tube can emit smoothly along the wedge shape inclined-plane of flat tube, reduces the possibility of its corrosion products.These can both guarantee that fin can not come off and product leakage, keep the heat exchange efficiency of whole heat exchanger, and whole processing and manufacturing is also convenient a lot, can improve the acceptance rate of the assembling processing of heat exchanger.

At last, should be pointed out that above embodiment only is the more representational example of the utility model.Obviously, the utility model is not limited to the foregoing description, and many distortion can also be arranged.Every foundation technical spirit of the present utility model all should be thought to belong to protection domain of the present utility model to any simple modification, equivalent variations and modification that above embodiment did.

Claims (4)

1. the flat tube of a parallel-flow heat exchanger and fin structure, some flat tubes are plugged on the header at two ends, be provided with fin between adjacent flat tube, the cross section that it is characterized in that described flat tube is wedge shape, fin between adjacent accordingly flat tube is the wide grading structure of the narrow end of an end, and wherein the cross section waveform of fin satisfies:

In the formula, L is the length of run of fin cross section waveform one-period, and R is the radius of curvature of fin cross section waveform, and H is the height of fin cross section waveform, and α is the slanted angle of fin cross section waveform main body.

2. the flat tube of parallel-flow heat exchanger according to claim 1 and fin structure is characterized in that the cross section waveform of described fin satisfies: L=R π+H-2R.

3. the flat tube of parallel-flow heat exchanger according to claim 1 and fin structure is characterized in that described cross section is in the flat tube of wedge shape, and along flat tube gradual change direction from narrow to wide, the cross section in hole, microchannel is ascending; And ascending along hole, microchannel cross section, the wall thickness of flat tube increases gradually.

4. the flat tube of parallel-flow heat exchanger according to claim 3 and fin structure is characterized in that the wall thickness of described flat tube increases satisfied gradually

In the formula, k is the breakdown strength value of design, and δ is the wall thickness in hole, the corresponding microchannel of flat tube, and d is the diameter in this hole, microchannel, and σ is the intensity of material.

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