CN200968800Y

CN200968800Y - Fin type heat exchanger

Info

Publication number: CN200968800Y
Application number: CN 200520077438
Authority: CN
Inventors: 吴植仁
Original assignee: Individual
Current assignee: Individual
Priority date: 2005-11-24
Filing date: 2005-11-24
Publication date: 2007-10-31
Anticipated expiration: 2015-11-24

Abstract

The utility model relates to a fin type heat interchanger, which comprises a heat sink, fins, an oil collecting box, a fluid in and out hole, a connecting flange, an air exhaust outlet, a sewage discharge outlet, a press plate, a cover plate, a draw rod etc. the utility model is suitable to be applied as a plurality of air condenser and is characterized in that: while installing the heat sink, a fin is arranged between every two pieces of the heat sink for enhancing the air side heat transmission; to reduce the heat resistance between the fin and the heat sink, the fin and the heat sink should be mutually pressed tightly enough or through soldering. The beneficial effect of the utility model is in that: due to the adopting of fins arranged at the air side strengthening the heat transmitting, the total heat transmitting factor can be improved while the occupying area of the condenser is reduced and costs lowered, can save the quantity of needed heat sinks by 80 percent. Correspondingly, while the utility model is applied as a transformer oil condenser, the needed transformer oil filling quantity can be reduced too.

Description

A kind of fin heat exchanger

Affiliated technical field

The utility model relates to a kind of heat exchanger.It is mainly used in the various aerial coolers, as the cat head air cooler in exhaust steam in steam turbine condenser, the petrochemical enterprise and reactor product cooler, oil-immersed power transformer aerial cooler, the oily aerial cooler of screw compressor, cold and warm air heating radiator and condenser in the refrigeration plant and the evaporimeter in the air-conditioning system.

Background technology

First industrial air cooler is to occur at an oil plant of US West in the twenty's of last century in the world, because effect is undesirable, development do not arranged in the several years.But on the air cooling of the transformer oil of power transformer, obtain urgently big development, the air-cooled oil cooled main method of transformer that become.In development early stage, the cooling element of air blast transformer oil cooler is based on fin-tube type, but eliminated by the better plate-sheet-type radiator of cost performance at present.According to reported in literature, first air cooling vapour condenser is to be initiated in nineteen thirty-nine by German GEA company in the world, so far, is used for the heat exchange element of the air cooling tubes condenser of steam turbines in the world, still adopt the various finned tubes of GEA system, comprise the finned tube of round tube and oval pipe and different wing types.Domestic large-scale air cooling device still adopts fin-tube type as the heat exchange element of cat head air cooler in the petrochemical industry and condenser.

At present, the reactor product cooler in the petrochemical enterprise mainly adopts the shell-and-tube water cooler, does not adopt air cooler basically.This must not be the cooling process that adopts then.(generally has only 150W/M because the overall heat-transfer coefficient K value of conventional air cooler is too low ²⁰About K), make the volume of air cooler too huge, be difficult in device, arrange.This not only will establish a cover circulating water cooling system, the about 40Kg of water consumption more than the product per ton, increase water pump power consumption and operating cost in addition.

Power transformer can produce loss when operation.Their (load loss of large-scale power transformer can reach hundreds of KW) are all changed heat into, make transformer generation temperature rise.And the insulating materials of power transformer all has certain thermal life.By the regulation of GB GB/15164-1994, TRANSFORMER INSULATING MATERIAL is to be benchmark for 98 ℃ by hot(test)-spot temperature, and 6 ℃ of insulating materials ageing rates of the every increase of temperature double.Therefore, in time power transformer being derived because of the heat that loss produces, is the important means that guarantees power transformer safe operation and life-saving.The cooling medium of existing goods power transformer has air-cooled and water-cooled, and air-cooled is topmost cooling medium.The air cooling element of Large and Medium-sized Power Transformer has two kinds of fin-tube type and plate-sheet-types.Because the relation of cost performance, the former is progressively eliminated by the latter.

At present, the screw compression oil cooler mostly adopts the shell-and-tube water cooler, not only wants the water resource of consume valuable, and water is surveyed easy fouling, the influence use.

At present, civilian fan coil and industrial cold and warm air heating radiator all adopt the fin-tube type heat exchange element basically, and they are to wear the aluminium fin that rises outside copper pipe, or outside steel pipe compound aluminium product rolled fin again, the manufacturing process complexity, cost performance is not as fin.

At present, condenser in the civilian refrigeration plant and evaporimeter (off-premises station and indoor set), mostly adopt the copper aluminium flake pipe of wearing, and industrial refrigeration plant mostly adopts the water cooler of shell-and-tube, the former manufacturing process complexity, and cost performance is not as fin, the latter, not only want the water resource of consume valuable, and water is surveyed easy fouling, the influence use.

The cooler engineering practice of Large and Medium-sized Power Transformer proves that than the fin-tube type heat exchange element, the plate-sheet-type heat exchange element has high cost performance, becomes the main heat dissipation element of air-cooled cooler so plate-sheet-type replaces fin-tube type gradually.It is that waveform punching by two thin steel is welded, and fin is assembled into radiator (cooling naturally) or cooler (forcing the blowing cooling) again.Yet be noted that this fin only relies on the heat transfer substrate heat exchange,, make that the cooler volume of Large and Medium-sized Power Transformer is very big so efficient is very low, the manufacturing cost height, account for transformer total cost 1/3, the filling weight of transformer oil is also big.

The Temperature Distribution of the actual measurement each point in the power transformer shows, the numerical value that falls to the ambient air temperature from the winding focus, tank surface falls to the ambient air temperature, account for the 60-70% that whole temperature are fallen, convection heat transfer' heat-transfer by convection between this illustrates from the metal surface to the atmosphere is the controlled process in the whole diabatic process.This shows that the gas of plate is surveyed not reinforcement of surface, is to cause low, the bulky key problem in technology of plate heat interchanger efficient.

Although air cooler has many good qualities, however its development be restricted, its most important reason has three, the one, its Coefficient K value is too little; The 2nd, its compactedness is too low, and this just makes that the volume of air cooler is too huge; The 3rd, the end temperature difference (outlet temperature of the fluid that is cooled and temperature of inlet air poor) is higher, reaches more than 15 ℃.

Summary of the invention

Task of the present utility model is to strengthen the convection heat transfer' heat-transfer by convection of gas side, in the hope of reaching the purpose that improves overall heat-transfer coefficient.As everyone knows, in the gas side fin being set, is to strengthen the effective measures that the gas side is conducted heat.Of the present utility model being characterised in that when the assembly unit fin, is provided with fin between two, for reducing the thermal resistance between fin and fin, should make them compress or impose soldering.

The beneficial effects of the utility model are, can improve overall heat-transfer coefficient, reduce the volume of cooler, reduce manufacturing cost, and water-saving and electricity-saving reduces operating cost, reduces the filling weight of working medium, improves the startability of device.

Description of drawings

Below in conjunction with drawings and Examples the utility model is further described.

Fig. 1 is the horizontal air-supply cooler construction schematic diagram that is provided with the wing formula, Fig. 2 is an A portion enlarged drawing among Fig. 1, Fig. 3 is a kind of fin structure schematic diagram, Fig. 4 is the vertical air-supply cooler construction schematic diagram that fin is set, Fig. 5 is a B portion enlarged diagram among Fig. 4, and Fig. 6 is a kind of structural representation of detachable cooler assembling.Among the figure: 1 fin, 2 fin heat transfer plates, 3 fins, 4 oil collection boxes, 5 connecting flanges, 6 gas vents, 7 sump oil floss holes, 8 heat transfer plate grooves, 9 heat transfer plate boss, 10 pressing plates, 11 pull bars, 12 nuts, 13 pads, 14 metal washers, 15 fluid inlet and outlets, 16 cover plates, the b fin is wide, the L fin is long, h fin height, m spacing of fin.

The specific embodiment

Fig. 1 is the horizontal air-supply cooler construction schematic diagram that is provided with fin, adopts assembly welding that each fin is welded into non-removable cooler.Between fin 1, be provided with fin 3, for guaranteeing closely contact between fin and fin, reducing the thermal resistance between them, employing both sides increased pressure board 10, and compress with pull bar 11 and nut 12, also can adopt soldering, make their seam.Fig. 4 is the vertical air-supply cooler construction schematic diagram that is provided with fin, also is to adopt assembly welding that each fin is welded into non-removable cooler.Between fin 1, be provided with fin 3, equally also can adopt pressing plate, pull bar, nut or soldering to reduce thermal contact resistance, just the installation position difference of fin.When laying fin, should make the airway of fin consistent with air supply direction.Fig. 6 is a kind of structural representation of detachable cooler assembling.

In a lot of occasions, make fin with aluminium, has better technology Ji benefit, this is because good heat conductivity, the proportion of aluminium is little, the corrosion resisting property in water, oil, fluorine Lyons is better than steel, the punch forming process performance is good, die life is long, and power consumption is few, can adopt the efficient height and the low cold welding seam of processing cost.So recommending aluminium is the preferred material of fin.

Some groups of fins are dressed up heat exchanger two kinds of ways, and a kind of is non-removable assembly welding method, as shown in Figure 1 and Figure 4, a kind ofly compresses method for dismountable pad, as shown in Figure 6.At the import and export of fin, pad 13 is set, use pull bar 11 and nut 12 again, make that fin tightens up mutually, static seal.

Embodiment

1. the reactor product cooler in the petrochemical enterprise is in the production procedure of petrochemical enterprise, for cutting down the consumption of energy, high-temperature product will be generally 60-80 ℃ through the product temperature after the heat exchange through heat exchanger to reclaim its sensible heat, through the shell-and-tube water cooler, be cooled to 40-50 ℃ again.Before address, the shell-and-tube water cooler has a series of shortcomings.In view of the applicant already on the large-scale petrochemical commercial plant, after the gas side adopts the technical measures that fin reinforcing conducts heat, obtained the end temperature difference and had only 3 ℃ and overall coefficient of heat transfer K to reach 1000w/m ²The gratifying achievement of (water-gas heat exchange) more than ℃, this just adopts the air-cooled technical possibility that provides for petrochemicals.

2. power transformer cooler chip forced air cooler has successfully replaced pipe wing cooler the sixth of the twelve Earthly Branches, and the oil cooling that is used in power transformer is but gone up, if in the gas side fin is set again, it is bright to have significant effect surely.Theoretical calculate and show in the operation actual effect of the cooler of oil plant tool fin, is the plain fin of (the high 40mm of fin, spacing of fin 3mm, the thick 0.2mm of fin) when adopting structural parameters,, the quantity of the needs of its fin might reduce 80%.In like manner, as the screw compression oil cooler, also can obtain suitable effect.

3. the radiator of cold and warm air heating radiator is equipped with blower fan again with passing to cold (heat) water in the sheet fin heat exchanger, replaces the fin-tube type cold and warm air heating radiator, will have cost performance preferably.

4. condenser in the refrigeration plant and evaporimeter are equipped with blower fan again with passing to fluorine Lyons in the sheet fin heat exchanger, replace the fin-tube type radiator, also will have cost performance preferably.

Claims

1. a sheet fin heat exchanger is characterized in that, when the assembly unit fin, between two fin is set.