CN104019492B - Heat exchanger with height of inner fins changing in flowing direction - Google Patents
Heat exchanger with height of inner fins changing in flowing direction Download PDFInfo
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- CN104019492B CN104019492B CN201410208276.9A CN201410208276A CN104019492B CN 104019492 B CN104019492 B CN 104019492B CN 201410208276 A CN201410208276 A CN 201410208276A CN 104019492 B CN104019492 B CN 104019492B
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Abstract
The invention relates to a heat exchanger with the height of inner fins changing in the flowing direction and provides a finned tube heat exchanger. The heater exchanger comprises an upper header, a lower header and a finned tube used for connecting the upper header and the lower header. The finned tube comprises the inner fins. The height of the inner fins is gradually increased along with the flowing direction of fluid. According to the heat exchanger, the structure of the finned tube is optimized to enable the heat exchange efficiency to be maximized so that the purposes of saving energy and protecting environment can be achieved.
Description
The present invention is application number is 201310483171.X, and denomination of invention is the divisional application of the patent of invention of " a kind of inner-finned-tube heat exchanger ".
Technical field
The invention belongs to field of heat exchangers, particularly relate to a kind of heating heat exchanger.
Background technology
The terminal device of Home Heating, thermal source is generally city central heating, self-built boiler room, community, Domestic wall stove etc., by heat transfer, radiation, convection current heat spreader out, allows the temperature in room get a promotion.
In heat exchanger; be suitable for finned tube exchanger widely at present; area of dissipation can be expanded by fin; strengthen heat transfer effect; but the quality of the setting of the heat exchanger types of finned tube and finned tube parameter all influencer's radiating effect; and at present when energy crisis; urgent need wants economize energy; meet the sustainable development of society; therefore need to develop a kind of new finned tube, need the structure of finned tube to be optimized simultaneously, make it reach maximum heat exchange efficiency; with economize energy, reach the object of environmental protection and energy saving.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of new linear pattern closed finned tube heat exchanger.
To achieve these goals, technical scheme of the present invention is as follows: a kind of finned tube exchanger of enclosed construction, comprise the finned tube of upper header, lower collector pipe and connection upper header and lower collector pipe, described finned tube comprises circular base tube and the first fin, the second fin, first fin and the second fin are arranged on the outside of base tube and the extended line of the first fin and the second fin intersects at the central axis of the base tube at the place, the center of circle of base tube, and the first fin and the second fin are along the first plane specular by base tube central axis; Described finned tube comprises the 3rd fin and the 4th fin, described 3rd fin, the 4th fin along the second plane respectively with the first fin and the second fin specular, described second plane and the first plane orthogonal and the central axis through base tube; Arrange the first brace between described first fin and the second fin, arrange the second brace between described 3rd fin and the 4th fin, the first brace and the second brace are circular arc type metallic plate; Second fin and the 4th fin of the first fin, the 3rd fin and adjacent fins pipe form space; The central axis at place, the center of circle of described circular arc-shaped metal plate and the central axes of base tube; Described base tube is straight tube, and the central axis of described adjacent base tube is parallel to each other; First fin of adjacent base tube is parallel to each other.
Angle between described first fin and the second fin is A, and the length of the first fin and the second fin is L, and the outer radius of base tube is R, and along base tube fin height H axially, the relation of above-mentioned four meets following formula:
Sin(A/2)=a×(L/R)
2+b×(L/R)+c，
H/(R×10)=e×Sin(A/2)
2-f×Sin(A/2)+h，
Wherein, A unit is angle, 60 ° of <A<110 °,
L is of a size of mm, 12mm<L<80mm,
The unit of R is mm, 10mm<R<80mm,
The unit of H is mm, 800mm<R<1200mm,
A, b, c, e, f, h are coefficient, and the scope of the scope of the scope of a to be the scope of 0.04-0.042, b be 0.266-0.28, c to be the scope of 0.36-0.37, e be 21-23, f is 44-45, h is 23-25.
The optimum of parameter is: a is 0.0412, b be 0.02715, c be 0.03628, e be 22, f be 44.37, h is 23.86.
As one preferably, the distance between adjacent base tube central axis is S=d × (L+R) × sin (A/2), and wherein d is 1.1-1.2.
The optimum results of d is 1.118.
The material of described base tube and fin is aluminium alloy, and the mass percent of the component of described aluminium alloy is as follows: 3.0%Cu, 1.9%Mg, 1.6%Ag, 0.6%Mn, 0.25%Zr, 0.3%Ce, 0.23%Ti, 0.38%Si, and all the other are Al.
The pipe inside of described base tube arranges anticorrosive coat, and the outside of base tube is coated with coating rubbing-layer, and the thermal coefficient of expansion of anticorrosive coat, base tube and wearing layer increases successively.
Described heat exchanger also comprises control system, and described control system controls according to indoor temperature the flow velocity entering water in heat exchanger.
Described control system comprises: temperature sensor, flow controller and central controller, and flow controller controls the flow velocity entering heat exchanger, described temperature sensor is for measuring indoor temperature, when indoor temperature reaches the first temperature, central controller controls flow controller reaches the first flow velocity, when indoor temperature reaches the second temperature higher than the first temperature, central controller controls flow controller reaches the second flow velocity lower than the first flow velocity, when indoor temperature reaches the 3rd temperature higher than the second temperature, central controller controls flow controller reaches the 3rd flow velocity lower than the second flow velocity, when indoor temperature reaches the 4th temperature higher than the 3rd temperature, central controller controls flow controller reaches the 4th flow velocity lower than the 3rd flow velocity, when indoor temperature reaches the 5th temperature higher than the 4th temperature, flow controller cuts out by central controller, stops water to enter heat exchanger.
Described anticorrosive coat is become to be grouped into by following:
Zinc flake 8.3%, aluminium oxide is 8%, and boric acid is 7.3%, and acrylic acid is 0.7%, and wetting dispersing agent is 0.4%, and thickener is 0.15%, and defoamer is 0.23%, the water of surplus.
Described wetting dispersing agent is the SA-20 in peregal series, and hydroxyethylcellulose selected by described thickener, and tributyl phosphate selected by described defoamer.
Axially fin is not had near the part of upper header and lower collector pipe at base tube.
Base tube is greater than the length not having finless parts of close upper fin near the length of the part of fin that do not have of the part of lower collector pipe.
The circulation area of upper header inner fluid reduces gradually along fluid flow direction.
The inside of upper header arranges deflector, and the lower tilt of described deflector from the position of heat exchanger entrance pipe to upper header extends.
The top wall of the upper header lower tilt from the position of heat exchanger entrance pipe to upper header extends.
The shape of flow deflector is the shape of straight plate shape or arc.
Compared with prior art, the present invention has following advantage:
1) the invention provides a kind of new finned tube, and because the extension line of fin of finned tube overlaps with the center of circle of base tube, thus make heat transfer effect reach best;
2) the present invention is by test of many times, devise different tube diameters, differing heights, angle fin test, thus obtain an optimum fin optimum results, and verified by test, thus demonstrate the accuracy of result;
3) by the reasonable distribution to the mass percent of the component of aluminium alloy, high-fire resistance and the high-termal conductivity of finned tube is improved;
4) thermal coefficient of expansion of anticorrosive coat, base tube and wearing layer increases successively, ensures that when logical hot water, the expansion rate of each layer is identical, ensures combining closely of each layer, prevents from coming off;
5) by control system, automatically control the flow velocity entering the water of heat exchanger, maintenance room temperature reaches a stable numerical value;
6) by axially there is no fin near the part of upper header and lower collector pipe at base tube, ensure that the air of base tube bottom can carry out in the space of finned tube smoothly, the suction effect reached, also can ensure simultaneously air technique to top convection current, increase the effect of heat convection;
7) be greater than the length not having finless parts of close upper fin by base tube near the length of the part of fin that do not have of the part of lower collector pipe, can convection effects be increased;
8) reducing gradually by the circulation area of upper header inner fluid, makes fluid flow flow velocity keep maximum, augmentation of heat transfer;
9) by the Based Intelligent Control of electric heater, realize energy-conservation.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of heat exchanger of the present invention.
Fig. 2 is the cross sectional representation of finned tube.
Fig. 3 is the schematic diagram of Heat Exchanger Control System.
Fig. 4 is that Fig. 3 is from the schematic diagram viewed from left side.
Fig. 5 is the heat exchanger schematic diagram with deflector.
Fig. 6 is the heat exchanger schematic diagram that upper header sectional area shrinks gradually.
Fig. 7 is the sectional drawing of second embodiment of the invention.
Fig. 8 is the schematic diagram of base tube inner fin.
Reference numeral is as follows:
1 upper header, does not have the part of fin in 2 base tubes, 3 lower collector pipe, 4 finned tubes, 5 base tubes, 6 water first fins, 7 gaps, 8 first braces, 9 second fins, 10 the 4th fins, 11 the 3rd fins, 12 second braces, 13 central controllers, 14 flow controllers, 15 temperature sensors, 16 temperature sensors, 17 heat exchangers, 18 inlet tubes, 19 outlets, 20 deflectors, 21 upper header upper surfaces, 22 vacuum-pumping tubes, 23 temperature controllers, 24 fins, 25 heating rods, 26 inner fins, 27 otch, 28 projections.
Detailed description of the invention
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail.
A kind of finned tube exchanger 17 of enclosed construction, comprise upper header 1, lower collector pipe 3 and be connected the finned tube 4 of upper header 1 and lower collector pipe 3, described finned tube 4 comprises circular base tube 5 and the first fin 6, second fin 9, first fin 6 and the second fin 9 are arranged on the outside of base tube 5 and the extended line of the first fin 6 and the second fin 9 intersects at the central axis of the base tube at the place, the center of circle of base tube 5, and the first fin 6 and the second fin 9 are along the first plane B specular by base tube central axis; Described finned tube comprises the 3rd fin 11 and the 4th fin 10, described 3rd fin 11, the 4th fin 10 along the second plane C respectively with the first fin 6 and the second fin 9 specular, described second plane C is vertical with the first plane B and through the central axis of base tube 5; Between described first fin 6 and the second fin 9, first brace 8 is set, the second brace 12, first brace 8 is set between described 3rd fin 11 and the 4th fin 10 and the second brace 12 is circular arc type metallic plate; The central axis of described circular arc-shaped metal plate and the central axes of base tube 5; Described base tube is straight tube, and the central axis of described adjacent base tube is parallel to each other.
Preferably, the first fin of adjacent base tube is parallel to each other, represents that the second fin of adjacent base tube is also parallel to each other, and in like manner, the 3rd fin, the 4th fin are also parallel to each other.This feature shows that finned tube arranges according to equidirectional.
It is to be understood that as shown in Figure 2, the central axis of base tube is exactly the line that the set of centre point on the cross section of base tube 5 is formed, and the central axis of circular arc-shaped metal plate is exactly the line that the set of the centre point of circular arc-shaped metal plate on cross section is formed.The central axis of described circular arc-shaped metal plate and the central axes of base tube 5 just refer on cross section, and circular arc-shaped metal plate and base tube are concentric circles.
Preferably, the size of all finned tubes is all identical.
By above-mentioned setting, make to form a gap 7 between fin and brace, when heat convection, gap 7 just defines a kind of chimney effect, can strengthen heat exchange.
Second fin and the 4th fin of the first fin, the 3rd fin and adjacent fins pipe form space, and this space forms certain space, can form chimney effect, add strong convection, augmentation of heat transfer.
Angle between described first fin 6 and the second fin 9 is A, and the length of the first fin 6 and the second fin 9 is L, and the outer radius of base tube is R, and certainly, because specular, the length of the 3rd fin 11 and the 4th fin 10 is also L naturally.But find in practice, if in heat transfer process. fin angle is too small, then heat exchange can be hindered, because the words that fin angle is too small, cause the first fin, the distance of the second fin is too near, then temperature boundary layer in closed area along with the direction of base tube height starts overlap, gas temperature moves closer to heat close to tube wall temperature saturated, flow resistance increases, finally worsen heat exchange on the contrary, the advantage of outer fin plays not out, same reason, along with the constantly increase of angle, make the distance of brace distance base tube original nearer, make temperature boundary layer equally in closed area along with the direction of base tube height starting overlap, gas temperature moves closer to heat close to tube wall temperature saturated, flow resistance increases, finally worsen heat exchange on the contrary, therefore angle has an optimum value.
For finned length, if oversize, even if then because the heat of base tube cannot arrive the end of fin in time or be effective also not obvious, if too short, then expand heat exchange area too little, cannot reach a good heat transfer effect, therefore the height of fin also has an optimum value.
For the distance between two finned tubes, if first distance is too near or completely close, then the space (see Fig. 1) of the spacing of the brace of two finned tubes is too little, then air cannot enter the space formed between finned tube by the gap between fin, heat exchange now can only rely on and enter air from exchanger base, good heat convection effect cannot be reached, same reason, if the distance is too far, then the one the second the 3 4th fins of finned tube cannot form the space of effective chimney effect, thus cause heat transfer effect to be deteriorated, therefore a suitable numerical value is also needed for the distance between two finned tubes.
As shown in Figure 4, for fin along base tube 5 height H axially, also need to have a suitable numerical value, if fin height is too high, then on the top of fin, because boundary layer in closed area along with the direction of base tube height starts overlap, cause the deterioration of heat exchange, in like manner, highly too low, then heat exchange does not give full play to, thus affects heat transfer effect.
Therefore, the present invention is the size relationship of the finned tube of the heat exchanger of the best summed up by the test data of the heat exchanger of multiple different size.Because finned tube also has included angle A, these three variablees of finned length L, fin height H, therefore, introduce two characteristic sin (A/2), L/R, H/R, R is the radius of base tube here, from the heat dissipation capacity maximum in heat transfer effect, calculate nearly 200 kinds of forms.Described size relationship is as follows:
Angle between described first fin and the second fin is A, and the length of the first fin and the second fin is L, and the outer radius of base tube is R, and along base tube fin height H axially, the relation of above-mentioned four meets following formula:
Sin(A/2)=a×(L/R)
2+b×(L/R)+c，
H/(R×10)= e×Sin(A/2)
2-f×Sin(A/2)+h，
Wherein, A unit is angle, 60 ° of <A<110 °,
L is of a size of mm, 12mm<L<80mm,
The unit of R is mm, 10mm<R<80mm,
The unit of H is mm, 800mm<R<1200mm,
A, b, c, e, f, h are coefficient, and the scope of the scope of the scope of a to be the scope of 0.04-0.042, b be 0.266-0.28, c to be the scope of 0.36-0.37, e be 21-23, f is 44-45, h is 23-25.
By testing after result of calculation, by the numerical value of computation bound and median, the result of gained matches with formula substantially, and error is substantially within 4%, and maximum relative error is no more than 6%, and mean error is 2% again.
The optimum of coefficient optimization is: a is 0.0412, b be 0.02715, c be 0.03628, e be 22, f be 44.37, h is 23.86.
Preferably, the distance between adjacent base tube central axis is S=d × (L+R) × sin (A/2), and wherein d is 1.1-1.2.
As shown in Figure 2, the distance between adjacent base tube central axis is exactly the distance on cross section between two base tube centers of circle.
The optimum results of d is 1.118.
The material of base tube and fin is aluminium alloy, and the mass percent of the component of described aluminium alloy is as follows: 3.0%Cu, 1.9%Mg, 1.6%Ag, 0.6%Mn, 0.25%Zr, 0.3%Ce, 0.23%Ti, 0.38%Si, and all the other are Al.
The manufacture method of aluminium alloy is: adopt vacuum metallurgy melting, and argon for protecting pouring becomes circle base, through 600 DEG C of Homogenization Treatments, at 400 DEG C, adopts and is hot extruded into bar, and then after 580 DEG C of solution hardening, carry out artificial aging process at 200 DEG C.Thermal conductivity factor is for being greater than 250W/ (m*k).
Base tube and fin can be integrally manufactured, also can split manufacture, and base tube and fin also can be different materials, and such as base tube is above-mentioned aluminium alloy, and fin then can adopt other alloys, and wherein other alloys are composed as follows:
Mass percent is as follows: Ni 30%; Cr 20%; Al 6%; C 0.03%; B 0.016%; Co 2%; Ti 3%; Nb 0.1%; La 0.2%; Ce 0.2%; Fe surplus.
The manufacture method of alloy is: become ingot by the composition smelting and pouring according to electrothermal alloy in vaccum sensitive stove, then at 1200-900 DEG C, alloy pig forge hot is become bar, be rolled into dish material at 1200-900 DEG C, then becomes the silk material of different size in room temperature cold-drawn.
After tested, above-mentioned alloy has very high thermal conductivity factor.
The pipe inside of described base tube 5 arranges anticorrosive coat, and the outside of base tube is coated with coating rubbing-layer, and the thermal coefficient of expansion of anticorrosive coat, base tube and wearing layer increases successively.Why so arranging is because in the process of heat supply, the anticorrosive coat of the inside of finned tube is first heated, first expand, then be outwards the second layer, third layer expanded by heating successively, therefore from inside to outside three layers of expansion number of times increase successively and can ensure that expansion rate is consistent substantially, ensure the compactness that each layer connects and stability.
As shown in Figure 3, described heat exchanger also comprises control system, and described control system controls according to indoor temperature the flow velocity entering water in heat exchanger.
Described control system comprises: temperature sensor (not illustrating in Fig. 3), flow controller 14 and central controller 13, and flow controller 14 controls the flow velocity entering the water of heat exchanger, described temperature sensor is for measuring indoor temperature, when indoor temperature is lower than the first temperature, flow controller is all opened, when indoor temperature reaches the first temperature, central controller controls flow controller reaches the first flow velocity, first flow velocity will lower than the flow velocity all opened, when indoor temperature reaches the second temperature higher than the first temperature, central controller controls flow velocity reaches the second flow velocity lower than the first flow speed controller, when indoor temperature reaches the 3rd temperature higher than the second temperature, central controller controls flow controller reaches the 3rd flow velocity lower than the second flow velocity, when indoor temperature reaches the 4th temperature higher than the 3rd temperature, central controller controls flow controller reaches the 4th flow velocity lower than the 3rd flow velocity, when indoor temperature reaches the 5th temperature higher than the 4th temperature, flow controller cuts out by central controller, stops water to enter heat exchanger.
5th temperature is exactly for very high temperature, and such as more than 25 DEG C, the first temperature is exactly lower temperature, such as less than 15 DEG C.By above-mentioned setting, can control the more heat of heat exchanger according to temperature, reach the effect of economize energy, especially next step will develop according to heat charging, therefore will inevitably receive an acclaim.
In addition, can be used for measuring and enter and go out the temperature of water of heat exchanger by set temperature sensor 15,16.
Described control system can be a single-chip microcomputer, can arrange control panel, and control panel is arranged on top or the bottom of heat exchanger, also can be arranged on and enter on the pipeline of heat exchanger.
Described anticorrosive coat is generated by coating anticorrosive paint, and anticorrosive paint is become to be grouped into by following: zinc flake 8.3%, aluminium oxide is 8%, and boric acid is 7.3%, and acrylic acid is 0.7%, and wetting dispersing agent is 0.4%, and thickener is 0.15%, and defoamer is 0.23%, the water of surplus.
Prepare a method for above-mentioned water-based anticorrosive paint, the method is implemented according to following steps,
A, by coating gross mass percentage, take a certain amount of water, the wetting dispersing agent of 0.4% and the defoamer of 0.23% respectively, then admixed together, abundant stirring makes it dissolving and makes coating mixed liquor A 1, add in mixed liquor A 1 again account for coating gross mass 8.3% flake metal powder, stir and make coating mixed liquor A 2;
B, by coating gross mass percentage, take 7.3% boric acid, composition mixed liquor, join in the water of 20-40% fully to dissolve and make inorganic acid mixed liquid B 1, then add the oxidate powder of 8% in mixed liquid B 1, be stirred to and make inorganic acid mixed liquid B 2 without precipitation;
C, by coating gross mass percentage, take the acrylic acid of 0.7%, join in the water of 5-15%, stir and make reducing agent mixed liquor C;
D, by coating gross mass percentage, take the thickener hydroxyethylcellulose of 0.15%, join in the water of 2.5-15%, be stirred to be translucent shape and gel-free of dissolving and occur namely stopping stirring making thickener mixed liquor D;
E, the inorganic acid mixed liquid B 2 of preparation is joined in coating mixed liquor A 2, then the 1/5-1/2 of reducing agent mixed liquor C amount of preparation is added, add thickener mixed liquor D while stirring, add the water of surplus again, continue stirring 30 ~ 90 minutes, until coating mixed liquor uniformity soilless sticking particle, finally add remaining reducing agent mixed liquor C again, stir 10-40 minute again, to obtain final product.
This kind of coating is applied over finned tube surface by spraying, brushing, dip-coating, dries 10-60 minute for 80 ± 10 DEG C, and 280 ± 40 DEG C of solidification sintering 30-60 minute, form good anti-corrosion coating.
Described wetting dispersing agent is the SA-20 in peregal series, and hydroxyethylcellulose selected by described thickener; Tributyl phosphate selected by described defoamer.
As shown in Figure 1, axially fin is not had near the part of upper header and lower collector pipe at base tube 5.Can ensure that the air of bottom can enter in the space formed between fin like this, out from air top, strengthen convection effects simultaneously.
As shown in Figure 4, base tube 5 is greater than the length not having finless parts of close upper fin near the length of the part of fin that do not have of the part of lower collector pipe.Main because be that lower air surface density is large, can ensure entering of more air, upper air density is little, and air more easily rises, and air therefore can be kept to enter and go out finned tube amount and be substantially consistent.
Preferably, bottom does not have the length of the part of fin to account for 5% of the length of base tube 5, and top does not have the length of the part of fin to account for 3% of the length of base tube 5.
As shown in Figure 8, the inwall of base tube 5 can arrange fin 26, such as, can arrange straight fins or helical fin, and the height of described fin can increase gradually along with on the direction of fluid flowing, and the highest fin height is minimum 1.05-1.1 times.Main cause is the direction along with fluid flowing, the temperature of fluid declines gradually, and its heat transfer effect is reduced gradually, arranges difference by the height increasing inner fins, can heat exchange on enhance fluid flow direction, thus heat transfer effect is consistent on the whole along fluid flow direction.
As shown in Figure 8, along the direction that inner fin extends, the top of inner fin 26 is arranged at intervals with otch 27.
Preferably, the degree of depth of otch 27 is 0.2-0.4 times of inner fin 26 height.The width of otch is the 30-60% of inner fin total length.
Preferably, along with the direction of fluid flowing, the degree of depth increase gradually of otch 27.Preferably, bosom is the most shallow place 1.05-1.15 times.
Preferably, along with the direction of fluid flowing, the density increase gradually of otch 27.Preferably, thickness is the thinnest place 1.03-1.12 times.
Preferably, inner fin is spiral inner fin, is 30-60 ° with the helical angle of the central axis of base tube 5.
Because along on the flow direction of fluid in upper header, the flowing pressure of fluid is more and more less, thus the maldistribution of fluid in the finned tube made, rate of flow of fluid in the finned tube of rear portion is declined, therefore in order to ensure that the pressure of the fluid in upper header remains unchanged, the present invention devises and the circulation area of upper header 1 inner fluid is reduced gradually along fluid flow direction, what the flow velocity of the fluid entered in finned tube can be made like this to keep is large as far as possible, especially the finned tube of fluid flow downstream is positioned at, thus augmentation of heat transfer.
As a preferred embodiment, as shown in Figure 5, the inside of upper header 1 arranges deflector 20, described deflector 20 is inclined, extend to the bottom of upper header 1 from the top of upper header 1, the fluid flow area of upper header is reduced gradually from heat exchanger entrance pipe 18, can ensure that upper collecting chamber keeps consistency along the pressure on fluid flow direction like this, thus the flow velocity of the fluid entered in finned tube is kept as far as possible large, thus augmentation of heat transfer.
Flow deflector 20 is connected with two, the left and right wall of upper header, and wherein at left wall, the position that heat exchanger entrance pipe 18 is connected with upper header 1, deflector 20 is positioned at the top of inlet tube and heat collector junction.
As the embodiment that can replace, flow deflector can be cancelled, directly the top wall 21 of upper header 1 is set to skewed, as shown in Figure 6, lower tilt from the position of inlet tube towards upper header 1 extends, thus make in upper header 1, along the flow direction of fluid, fluid flow area reduces gradually from heat exchanger entrance pipe 18.
The top of upper header can be straight tabular, also can be arcuate structure.
As another one embodiment, as shown in Figure 7, described heat exchanger 17 can be electric heating heat exchanger.
The base tube at Fig. 7 heat exchanger both ends only arranges the fin of inner side, for outside, fin is not set, main cause makes full use of heat-dissipating space, can make to form suction channel between the fin of adjacent finned tube, for the fin in outside because inner side arranges fin, suction channel cannot be formed, therefore outside fin is deleted and can be saved space, space is fully left for inner side fin simultaneously, can augmentation of heat transfer.This feature is equally also applicable to embodiment above.
The upper header 1 of heat exchanger, lower collector pipe 3 and finned tube 4 constitute the passage of fluid circulation.Upper header is provided with vacuum-pumping tube 22, vavuum pump is by vacuum orifice pipe 22, and be evacuated by the inner chamber of upper header 1, lower collector pipe 3 and finned tube 4, then pour into appropriate superconducting fluid by vacuum-pumping tube 22, superconducting fluid finally flow in lower collector pipe 3.After the injection rate of superconducting fluid reaches normal capacity, then vacuum-pumping tube 22 is sealed.
As superconducting fluid atomization when 50-60 DEG C of heat transfer medium, its heat conduction is fast, energy-conservation, safety, and superconducting fluid itself is nontoxic, tasteless, atomization at the pipeline closed, repeats itself, does not need to use pipeline to circulate.The sidewall operating pressure of superconducting fluid to finned tube is little, and non-corrosiveness, "dead", reaches long service life, the object of safe handling.
Heating rod 25 is set in lower collector pipe 3, and at an end set temperature controller 23 of lower collector pipe 3, for controlling the temperature of heat exchanger.During use, plug in, the button on twisting temperature controller 23 is to suitable temperature, and heating rod 25 electrified regulation, superconducting fluid rapid atomization under vacuum conditions after being heated, riddles each finned tube, upper lower collector pipe, reaches the object of Fast Persistence heating.When reaching the temperature of temperature controller 23 setting, temperature controller controls heating rod and stops heating, and when the temperature arranged lower than temperature controller 23, temperature controller 23 controls heating rod and heats.
The outer setting fin 24 again of heating rod 25, for increasing heat exchange area, augmentation of heat transfer.
Certainly, as replacement, the heat exchanging fluid in heat exchanger can be set to water, making water atomization when 50-60 DEG C, preventing from, because the temperature of water is too high, causing heat exchanger outer wall too hot by vacuumizing.
In order to reach better heating effect, can control system being set, automatically controlling the heating power of heating rod 25 according to indoor temperature.Described control system comprises: temperature sensor and central controller, and described temperature sensor is for measuring indoor temperature, and central controller adjusts heating power automatically according to the numerical value of indoor temperature.Detailed description of the invention is as follows:
When indoor temperature is lower than the first temperature, heating rod 25 heats with the first power, when indoor temperature reaches the first temperature, central controller heating rod 25 heats with the second power being less than the first power, when indoor temperature reaches the second temperature higher than the first temperature, central controller controls heating rod 25 heats with the 3rd power being less than the second power, when indoor temperature reaches the 3rd temperature higher than the second temperature, central controller controls heating rod 25 heats with the 4th power being less than the 3rd power, when indoor temperature reaches the 4th temperature higher than the 3rd temperature, central controller controls heating rod 25 heats with the 5th power being less than the 4th power, when indoor temperature reaches the 5th temperature higher than the 4th temperature, control heating rod 25 is stopped heating by central controller.
For detailed description of the invention content described above, the material of such as finned tube, coating, be equally also applicable to the embodiment of Fig. 7.
Although the present invention discloses as above with preferred embodiment, the present invention is not defined in this.Any those skilled in the art, without departing from the spirit and scope of the present invention, all can make various changes or modifications, and therefore protection scope of the present invention should be as the criterion with claim limited range.
Claims (1)
1. the finned tube exchanger of an enclosed construction, comprise the finned tube of upper header, lower collector pipe and connection upper header and lower collector pipe, described finned tube comprises circular base tube and the first fin, the second fin, first fin and the second fin are arranged on the outside of base tube and the extended line of the first fin and the second fin intersects at the central axis of the base tube at the place, the center of circle of base tube, and the first fin and the second fin are along the first plane specular by base tube central axis; Described finned tube comprises the 3rd fin and the 4th fin, described 3rd fin, the 4th fin along the second plane respectively with the first fin and the second fin specular, described second plane and the first plane orthogonal and the central axis through base tube; Arrange the first brace between described first fin and the second fin, arrange the second brace between described 3rd fin and the 4th fin, the first brace and the second brace are circular arc type metallic plate; Second fin and the 4th fin of the first fin, the 3rd fin and adjacent fins pipe form space; The central axis at place, the center of circle of described circular arc-shaped metal plate and the central axes of base tube; Described base tube is straight tube, and the central axis of described adjacent base tube is parallel to each other, and the inwall of base tube arranges inner fin, along the direction that inner fin extends, the head clearance of inner fin otch is set; It is characterized in that, the degree of depth of otch is 0.2-0.4 times of inner fin height, and the width of otch is the 30-60% of inner fin total length; The direction that the height of described inner fin flows along with fluid increases gradually;
Angle between described first fin and the second fin is A, and the length of the first fin and the second fin is L, and the outer radius of base tube is R, and along base tube fin height H axially, the relation of above-mentioned four meets following formula:
Sin(A/2)=a×(L/R)
2+b×(L/R)+c
H/(R×10)= e×Sin(A/2)
2-f×Sin(A/2)+h；
Wherein, A unit is angle, 60 ° of <A<110 °,
L is of a size of mm, 12mm<L<80mm,
The unit of R is mm, 10mm<R<80mm,
The unit of H is mm, 800mm<H<1200mm,
A, b, c, e, f, h are coefficient, and the scope of the scope of the scope of a to be the scope of 0.04-0.042, b be 0.266-0.28, c to be the scope of 0.36-0.37, e be 21-23, f is 44-45, h is 23-25.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410208276.9A CN104019492B (en) | 2013-10-16 | 2013-10-16 | Heat exchanger with height of inner fins changing in flowing direction |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410208276.9A CN104019492B (en) | 2013-10-16 | 2013-10-16 | Heat exchanger with height of inner fins changing in flowing direction |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310483171.XA Division CN103591828B (en) | 2013-10-16 | 2013-10-16 | Heat exchanger with internal finned tubes |
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| Publication Number | Publication Date |
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| CN104019492A CN104019492A (en) | 2014-09-03 |
| CN104019492B true CN104019492B (en) | 2015-06-03 |
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| CN201410208276.9A Expired - Fee Related CN104019492B (en) | 2013-10-16 | 2013-10-16 | Heat exchanger with height of inner fins changing in flowing direction |
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| CN109631357B (en) * | 2016-01-12 | 2020-04-07 | 山东理工大学 | Intelligent control solar heat storage system with variable through hole area |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2478063Y (en) * | 2001-01-06 | 2002-02-20 | 营口港信铝材有限公司 | Fin hollowed aluminium alloy energy saving radiator |
| CN1403779A (en) * | 2002-10-11 | 2003-03-19 | 西安交通大学 | Internal thread heat-transferring pipe |
| CN1308642C (en) * | 2002-12-10 | 2007-04-04 | 松下电器产业株式会社 | Double-layer tube type heat exchanger |
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2013
- 2013-10-16 CN CN201410208276.9A patent/CN104019492B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2478063Y (en) * | 2001-01-06 | 2002-02-20 | 营口港信铝材有限公司 | Fin hollowed aluminium alloy energy saving radiator |
| CN1403779A (en) * | 2002-10-11 | 2003-03-19 | 西安交通大学 | Internal thread heat-transferring pipe |
| CN1308642C (en) * | 2002-12-10 | 2007-04-04 | 松下电器产业株式会社 | Double-layer tube type heat exchanger |
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| CN104019492A (en) | 2014-09-03 |
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