CN201277832Y

CN201277832Y - Asymmetrical fins for reinforced heat transferring

Info

Publication number: CN201277832Y
Application number: CN 200820133807
Authority: CN
Inventors: 林崐; 刘阳; 尤顺义; 张静; 刘凌晓
Original assignee: Guangdong Chigo Air Conditioning Co Ltd
Current assignee: Guangdong Chigo Air Conditioning Co Ltd
Priority date: 2008-08-26
Filing date: 2008-08-26
Publication date: 2009-07-22
Anticipated expiration: 2018-08-26

Abstract

The utility model discloses an asymmetrical fin for strengthening the heat transfer, which comprises a heat exchanger comprising a plurality of internal-thread copper tubes and a plurality of columns of fins vertically and tightly sleeved on the copper tubes, a plurality of tube holes and a plurality of rows of grids are arranged on substrates of the fins along the flowing direction of air outside the tubes, the width of upstream part of each fin is more than that of the downstream part of each fin, and the width of each grid at the upstream part is more than that of each grid at the downstream part. The asymmetrical fin can further utilize the effective space of the fins to reduce the windage resistance of the heat exchangers at the front rows, increase the heat-exchange temperature difference of the heat exchangers at the rear rows, improve the heat exchange efficiency of the fins and reduce the flow resistance and the noise.

Description

The asymmetric fin of augmentation of heat transfer

Technical field

The utility model relates to a kind of fin, particularly is applied to the asymmetric fin of a kind of augmentation of heat transfer of the fin-tube type evaporimeter of refrigeration air-conditioner and condenser.

Background technology

The fin-tube type finned heat exchanger is a heat exchanger structure form the most frequently used in the air-conditioning, refrigeration is sharp in heat exchanger flows in pipe, air flows outside pipe, most of thermal resistance in the diabatic process all concentrates on air side, and the heat exchange of therefore strengthening air side has become the major issue of fin-tube type heat exchanger augmentation of heat transfer.At present in the plain fin that uses, because the direction that flows along air, air can progressive additive in boundary layer that fin surface forms, and the heat exchange effect of fin windward side is better, and then because the reducing of heat transfer temperature difference, effect is relatively poor by the wind side.In order further to improve the heat transfer property of finned heat exchanger, slitted fin is wherein a kind of comparison effective and efficient manner commonly used.If but it is fewer to crack, the disturbance of convection cell and will be smaller to the destruction of the flow boundary layer of air, the field concertedness is improved not enough, can not effectively strengthen heat exchange, many if crack, hindered flowing of air, the resistance of whole heat exchanger is increased often, can not meet the demands.There is the bigger problem of processing difficulties (as the fin of 200720054033,03218964.8 patent disclosure formerly) or flow resistance (as the fin of 200420072527.7 patent disclosures formerly) in the slitted fin of existing augmentation of heat transfer more.

Summary of the invention

The utility model is at the deficiencies in the prior art and defective, and design provides a kind of fin that can strengthen the whole heat exchange effect of heat exchanger.The utility model can further utilize the effective area of fin, reduces the windage at many row's heat exchangers front row, increases back row's heat transfer temperature difference, improves heat exchange efficiency of fins, reduces flow resistance, reduces noise.

The technical solution adopted in the utility model is: a kind of asymmetric fin of augmentation of heat transfer, heat exchanger is formed with the vertical described fin of multiple row that tightly is enclosed within on the copper pipe by containing many inner screw thread copper pipes, described fin is provided with a plurality of pores on substrate, number row grid, flow direction along the pipe outer air, the width of described fin upstream portion is greater than the width of downstream part, and the width of upstream portion grid is greater than the width of downstream grid.

Along the flow direction of pipe outer air, adjacent grid length increases successively or shortens.

Along the flow direction of pipe outer air, the width of the substrate between the adjacent grid is constant or shorten.

Described fin can be a monoblock type fin, also the single fin of two or more rows can be combined.

The characteristics that the utlity model has:

1, reduces fin by the width of wind side, saved material.

2, changed the fin drift of second sheet, the fin drift of redesign, the width that will crack reduces, effective fail temperature boundary layer just, enhanced heat exchange, the constant increase effect of windage that makes of grid quantity weakens, and effectively raises the efficient of heat exchanger integral body.

The utility model is described in further detail below in conjunction with drawings and the specific embodiments.

Description of drawings

Fig. 1 is the utility model structural representation;

Fig. 2 is the utility model fin combination schematic diagram.

D0 is the width of upstream fin among the figure, and D1 is the width of downstream fin, and 1 is the upstream grid width, and 2 is the upstream grid substrate width, and 3 is the downstream grid width, and 4 is the downstream grid substrate width.

The specific embodiment

Embodiment 1

As shown in Figure 1, the utility model heat exchanger is made up of with the vertical fin that tightly is enclosed within on the copper pipe the single many inner screw thread copper pipes that contain cold-producing medium, described fin comprise a plurality of copper pipe through holes and substrate and on grid, the flow direction of heat transferring medium outside refrigerant pipe, the fin width D0 of upstream is greater than the fin width D1 in downstream, the grid width 1 of upstream is greater than the grid width 3 in downstream, and the substrate width 2 of upstream is greater than the substrate width 4 in downstream, and grid quantity is identical.

No matter the utility model heat exchanger still is that condenser uses and all has identical effect and operation principle as evaporimeter.Heat transferring medium enters with certain speed, carries out heat exchange with fin.Because the fin grid width of upstream is relatively large, heat transferring medium through the upstream suffered windage less, make that the wind speed in downstream is bigger, the grid in downstream is narrower, effectively the heat exchange in downstream has been strengthened in the fail temperature boundary layer, and the grid quantity in downstream is constant, the increase of windage is not obvious, thereby has strengthened the whole heat exchange effect of heat exchanger.

Embodiment 2

The difference of present embodiment and embodiment 1 is that embodiment one is the monoblock type fin, and present embodiment is to have two row's fins to combine, and principle is with embodiment 1.

First row's fin still is common fin as shown in Figure 2, the asymmetric fin of the augmentation of heat transfer that second row's fin provides for the utility model, when many rows fin is used in combination, can use the combination of two rows or three row's fins, only on last row's fin in downstream, use the utility model, because of how row's fins set are fashionable, flow process is longer, the influence of windage is comparatively obvious, if many row's fins all use asymmetric fin can cause windage to increase obviously the raising of the heat exchange property that influence is whole.

By overall test, the air-conditioning ability improves 1%-2% under equal situation, and Energy Efficiency Ratio improves 1%-2%.

Above embodiment only is illustrative rather than definitive thereof the technical solution of the utility model.Height and width as grid all can change, the width of substrate also can be different, the size of different row's fin grids also can be different, each arranges the cold-producing medium copper pipe can be non-pipe, and the caliber of each copper pipe can change, but the principle of adhering to all the time is, described fin, the fin width of upstream is greater than the fin width in downstream, and the width of upstream grid is greater than the width of downstream grid, and the quantity of grid remains unchanged.

Claims

1, a kind of asymmetric fin of augmentation of heat transfer, it is characterized in that, form heat exchanger by containing many inner screw thread copper pipes with the vertical described fin of multiple row that tightly is enclosed within on the copper pipe, described fin is provided with a plurality of pores on substrate, number row grid, along the flow direction of pipe outer air, the width of described fin upstream portion is greater than the width of downstream part, and the width of upstream portion grid is greater than the width of downstream grid.

2, the asymmetric fin of augmentation of heat transfer according to claim 1 is characterized in that, along the flow direction of pipe outer air, adjacent grid length increases successively or shortens.

3, the asymmetric fin of augmentation of heat transfer according to claim 1 is characterized in that, along the flow direction of pipe outer air, the width of the substrate between the adjacent grid is constant or shorten.

4, the asymmetric fin of augmentation of heat transfer according to claim 1 is characterized in that, described fin can be a monoblock type fin, also the single fin of two or more rows can be combined.