CN207539876U - A kind of steam generator of heat conductivity of vacuum insulation panel variation - Google Patents
A kind of steam generator of heat conductivity of vacuum insulation panel variation Download PDFInfo
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- CN207539876U CN207539876U CN201721178160.0U CN201721178160U CN207539876U CN 207539876 U CN207539876 U CN 207539876U CN 201721178160 U CN201721178160 U CN 201721178160U CN 207539876 U CN207539876 U CN 207539876U
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- steam generator
- electric heating
- heating tube
- insulating plate
- babinet
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Abstract
The utility model provides a kind of steam generator of heat conductivity of vacuum insulation panel variation, the steam generator includes babinet, electric heating tube, cold water inlet and steam (vapor) outlet, the babinet includes vertical portion and horizontal component, the vertical portion includes inner and outer wall, vacuum heat-insulating plate is set between the inner and outer wall, thermal insulation material is filled in space between vacuum heat-insulating plate, inner and outer wall, the thermal conductivity factor of the vacuum heat-insulating plate is different, along the short transverse of vertical portion, the thermal conductivity factor of vacuum heat-insulating plate 11 constantly reduces.The steam generator of the utility model while essentially identical insulating efficiency is realized, can reduce the cost of evaporator by the design of the variation of heat conductivity of vacuum insulation panel in short transverse.
Description
Technical field
The utility model is related to boiler technology field more particularly to a kind of steam generators of Novel structure.
Background technology
Steam generator is the mechanical equipment for water being heated as using the thermal energy of fuel or other energy steam.Steam is sent out
Raw device application field is extensive, is widely used in clothing factory, drycleaner's, restaurant, steamed bun shop, dining room, dining room, factories and miness, Bean Products Factory etc.
Place.
Current steam generator is mostly using combustion gas or fuel Heating, and the efficiency of heating surface is low, and the electricity used at present
Hot steam generator is to be arranged on using electrothermal tube to the bottom of storage tank mostly, directly heats and generate to the water in water tank
Steam.There is the problem of heating is slow, and the thermal efficiency is low in this electric heating steam generator.
As Chinese patent literature CN2071061U discloses a kind of steam generating appliances for the effects that being used for beauty, health care, packet
It includes metal electrode board and the housing made of heat resistant plastice, go out vapour cover board, interior panelling, flexible handle, metal electrode board is necessary
Power on through power cord, there are internal baffles in housing, it is suitable for reading to have vapour cover board, there is socket slot that can be inserted with band outside housing bottom
The flexible handle of mouth is connected.For another example a kind of improved electric-heating steam occurs disclosed in Chinese patent literature CN2651594Y
Device, for generating steam, including body cavity and electric heater, electric heater is placed in body cavity, is equipped in body cavity
Partition board separates cavity above and below, and upper cavity is vapor cavity, and lower chamber is heating water cavity, and partition board is equipped with steaming hole；Partition board
There are 2-6 layers, form transition chamber between partition board, the steaming hole dislocation arrangement on adjacent partition board.Electric heater will be heated in water cavity
Water heats, and steam is entered spare in vapor cavity by the transition chamber of partition board and its formation.Disclosed in above-mentioned two patent document
Electric heating steam generator, belong to such product.
Steam generator is more demanding to the heat insulation of housing, common material be used as steam generator wall every
Thermal effect is poor, and in order to reach preferable heat insulation, the heat-barrier material thickness used is larger so that steam generator consumable quantity is too
Greatly, construction cost is virtually increased.It is so particularly important as steam generator heat-preserving wall using light-duty material.
Vacuum heat-insulating plate (VIP plates), is one kind in vacuum thermal insulating material, is answered by filling core material and vacuum protection surface layer
It closes, heat caused by it is effectively prevented from cross-ventilation is transmitted, therefore thermal conductivity factor can be greatly lowered, less than 0.003w/
Mk, and any ODS materials are not contained, there is environmental protection and energy-efficient characteristic, be state-of-the-art efficient in the world at present
Thermal insulation material.And also have at present and vacuum heat-insulating plate is applied to water tank heat preserving, such as CN202339023A by vacuum heat-insulating plate
It is kept the temperature applied to solar water container, CN104180534A is applied to water heater heat preservation.
But the cost requirement of vacuum heat-insulating plate is very high, and because of thickness difference, thermal conductivity factor difference and use
The cost requirement of vacuum heat-insulating plate is not also high caused by the reasons such as vacuum heat-insulating plate quantity.Vacuum insulation plate thickness is bigger, heat preservation
Effect is better, but cost increase is also very much, and thermal conductivity factor more minimum living temp effect is better, but cost is higher, vacuum heat-insulating plate
Distributed quantity is more, and heat insulation effect is better, but cost is also high.Therefore the utility model provides a kind of new steam generation
Device while completing heat insulation effect to reach, has the function that save cost.
Utility model content
The purpose of this utility model is to provide a kind of steam generator of heat conductivity of vacuum insulation panel variation, by true
Empty heat-insulating shield thermal conductivity factor changes to reach saving cost, improves heat insulation effect.
To achieve the above object, the utility model adopts the following technical solution：
A kind of steam generator, the steam generator include babinet, electric heating tube, cold water inlet and steam (vapor) outlet, institute
It states babinet and includes vertical portion and horizontal component, the vertical portion includes inner and outer wall, set between the inner and outer wall
Vacuum heat-insulating plate is put, thermal insulation material, the heat conduction system of the vacuum heat-insulating plate are filled in space between vacuum heat-insulating plate, inner and outer wall
Number is different, and along the short transverse of vertical portion, the thermal conductivity factor of vacuum heat-insulating plate 11 constantly reduces.
Preferably, along the short transverse of vertical portion, the amplitude that heat conductivity of vacuum insulation panel constantly reduces is continuous
Increase.
Preferably, the thermal conductivity factor of the vacuum heat-insulating plate of lowest part is the heat conductivity of vacuum insulation panel of topmost
1.18-1.39 again.
Preferably, the thickness of the vacuum heat-insulating plate of lowest part is 1.29 times of the vacuum insulation plate thickness of topmost.
Preferably, the thermal insulation material is polyurethane.
Preferably, the cold water inlet is arranged on the side wall of babinet, setting exhaust outlet in the babinet top is described
Electric heating tube is arranged in babinet, and the electric heating tube includes outer tube and the electric heater being arranged in outer tube, the electrical heating
Manage and set for vertical direction, the electric heating tube lower part sets intake tunnel, ensure babinet water can enter electric heating tube into
Row heating, the top connection steam (vapor) outlet of electric heating tube.
Preferably, the outer diameter of steam (vapor) outlet pipeline is less than the outer diameter of the outer tube of electric heating tube.
Preferably, the cross section of the babinet is rectangular, the cross section of the electric heating tube is round.
Preferably, the electric heating tube is arranged on the centre position of babinet.
Preferably, the outer diameter of the outer tube of the electric heating tube is 0.3-0.45 times of the internal diameter of babinet.
Preferably, intake tunnel is strip slot.
Preferably, the intake tunnel is arranged on less than 50% babinet water level.
Preferably, the centrally disposed center electrically heated rod axially of the electric heating tube and along center
Electrically heated rod sets more from radial direction electrically heated rod to the more radial direction electrically heated rods radially extended on the radial direction electrically heated rod
Outwardly extending triangle cooling fin.
Preferably, the triangle cooling fin is right angled triangle cooling fin, the short side for forming right angle is located at radially
On bar, long side extends outwardly from radial bars；Multiple triangle cooling fins are set on each radial direction electrically heated rod, described multiple three
Angle radiator piece is similar figures；
The opposite acute angle of the short side at the right angle is M, and the length of side of the long side at right angle is L, phase on same radial direction electrically heated rod
The adjacent distance of adjacent triangle cooling fin is S, then meets following requirement：
tan(M)=a*tan(S/L)3-b*(S/L)2+ c* (S/L)-d, wherein tan is trigonometric function, and a, b, c, d are ginsengs
Number；
61.0<a<61.5,
60.0<b<60.5,
21<c<22,
2.2<d<2.3,4<M<35 °, preferably 8<M<25°
0.18< S/L <0.38。
The utility model has the following advantages that：
1）The heat conductivity of vacuum insulation panel of the utility model steam generator changes along short transverse, passes through heat conduction system
Number changes to reach saving cost, and heat insulation effect is turned up.
2）The utility model coordinates polyurethane to substantially increase case as library plate thermal insulation material by using vacuum heat-insulating plate
The heat-insulating property of body, the more energy conservation and environmental protection compared with conventional steam generator.
3）The utility model devises a kind of steam generator of Novel structure, by such structure, can pass through one
Device, which can be realized, quick provides steam, and the steam generator has rapid heating, uniformity of temperature profile, safe and reliable
Function improves the efficiency of heating surface.
4）The utility model by set the trepanning of electric heating tube bottom along in short transverse distribution density, area with
And the setting of the spacing variation of multiple rows of trepanning, the efficiency of heating surface is further improved, improves the security performance of steam generator.
5) the utility model devises new-type vertical tubular electric heating tube, and electric heating tube top directly connects steam and goes out
Mouthful, by such mechanism, it can further improve the efficiency of heating surface.
6）The utility model devises variation of the electrical heating efficiency along short transverse, can further improve the peace of device
Full performance and heating properties.
7）The utility model devises the electric heating tube of new-type interior heat radiating fin structure, passes through the three of Novel structure electric heating tube
Angle radiator piece increases the disturbance of heating surface (area) (HS and fluid, improves heating effect.
8）The utility model passes through numerical simulation and many experiments, it is determined that the optimal relationship of interior cooling fin, further
Heating effect is improved, is also related to providing a best reference frame for the electric heating tube of such structure.
Description of the drawings：
Fig. 1 is the structure diagram of the steam generator casing of the utility model；
Fig. 2 is the utility model steam generator casing vertical portion thickness change preferred embodiment schematic diagram；
Fig. 3 changes preferred embodiment schematic diagram for the utility model steam generator casing vertical portion spacing；
Fig. 4 is the steam generator preferred structure schematic diagram that the utility model generates hot water and steam.
Fig. 5 is the steam generator preferred structure schematic diagram for only generating steam of the utility model.
Fig. 6 is electric heating tube Structure of cross section schematic diagram.
Fig. 7 is heat sink sizes schematic diagram in electric heating tube.
Fig. 8 is electric heating tube longitudinal direction section schematic diagram.
In figure：1- babinets；2- electric heating tubes；3- cold water inlets；4- hot water outlets；5- steam (vapor) outlets；6- exhaust outlets；
11- vacuum heat-insulating plates；12- hard polyurethane foams；
21- outer tubes；22- radial direction electrically heated rods；23- triangle cooling fins；24- centers electrically heated rod；25- trepannings
41- vertical portions, 42- horizontal components, 411- inner walls, 412- outer walls.
Specific embodiment
Fig. 1-8 illustrates a kind of steam generator.As shown in figure 4, the steam generator includes babinet 1, electric heating tube
2nd, cold water inlet 3, hot water outlet 4 and steam (vapor) outlet 5.
Babinet 1 includes vertical portion 41 and horizontal component 42, as shown in Figure 1, the vertical portion 41 includes 411 He of inner wall
Outer wall 412 sets vacuum heat-insulating plate 11, vacuum heat-insulating plate 11, inner wall 411 and outer wall between the inner wall 411 and outer wall 412
Thermal insulation material is filled in space between 412.
As first preferred embodiment, as shown in Fig. 2, the thickness of the vacuum heat-insulating plate 11 is different, along vertical
The short transverse of part 41（I.e. from the bottom up）, the thickness of vacuum heat-insulating plate 11 constantly increases.Pass through thickness difference so that edge
It in short transverse, total heat transfer coefficient of babinet is lower and lower, so that cabinet insulation effect is become better and better.
Because in a vapor generator, because the hot water that density reasons cause temperature high is walked upwards, the low cold water of temperature to
Under walk, therefore the coolant-temperature gage of steam generator lower part will be less than steam generator top water temperature.Steam is caused to be sent out in this way
The internal-external temperature difference of raw device lower part is less than the temperature difference on steam generator top.The utility model is directed to this case, passes through setting
Vacuum heat-insulating plate is different in the thickness of different height, so that the heat insulation effect taken of different location is different.It is set on top
Thick heat-insulating shield is put, targetedly increases the heat insulation effect on top.It sets by doing so so that realizing essentially identical heat preservation
In the case of, can save more than 15% cost.Meanwhile in the case where spending identical cost, more than 13% can be improved
Heat insulation effect.
Further preferably, along the short transverse of vertical portion 41, the ever-increasing amplitude of 11 thickness of vacuum heat-insulating plate is not
Disconnected increase.
It is found by numerical simulation and experiment, the setting changed by amplitude can meet temperature change well
The regularity of distribution, so as to further reach the technique effect for reducing cost and improving heat preservation.
Further preferably, the thickness of the vacuum heat-insulating plate of topmost is the 1.2-1.4 of the vacuum insulation plate thickness of lowest part
Times.
Further preferably, the thickness of the vacuum heat-insulating plate of topmost is 1.3 times of the vacuum insulation plate thickness of lowest part.
By the setting of above-mentioned preferred heat preservation plate thickness, it is capable of the optimum efficiency of cost of implementation saving.
Preferably, the material identical of different vacuum heat-insulating plates.
Preferably, the thermal conductivity factor of different vacuum heat-insulating plates is identical.
Preferably, along short transverse, the spacing between adjacent vacuum heat-insulating plate is identical.
As second preferred embodiment, preferably, the thermal conductivity factor of the vacuum heat-insulating plate 11 is different, along perpendicular
The short transverse of straight part 41（I.e. from the bottom up）, the thermal conductivity factor of vacuum heat-insulating plate 11 constantly reduces.Pass through thermal conductivity factor
It is different so that along in short transverse, total heat transfer coefficient of babinet is lower and lower, so that cabinet insulation effect is increasingly
It is good.
Because in a vapor generator, because the water that density reasons cause temperature high is walked upwards, the low water of temperature is walked downwards,
Therefore the temperature of the water of steam generator lower part will be less than the temperature of the water on steam generator top.Lead to steam generator in this way
The internal-external temperature difference of lower part is less than the temperature difference on steam generator top.The utility model is directed to this case, by setting vacuum
Heat-insulating shield is different in the thermal conductivity factor of different height, so that the heat insulation effect taken of different location is different.It is set on top
The low heat-insulating shield of thermal conductivity factor is put, targetedly increases the heat insulation effect on top.It sets by doing so so that basic realizing
In the case of identical heat preservation, more than 15% cost can be saved.Meanwhile it in the case where spending identical cost, can improve
More than 13% heat insulation effect.
Further preferably, the width constantly reduced along the short transverse of vertical portion 41,11 thermal conductivity factor of vacuum heat-insulating plate
Degree is continuous to be increased.
It is found by numerical simulation and experiment, the setting changed by amplitude can meet temperature change well
The regularity of distribution, so as to further reach the technique effect for reducing cost and improving heat preservation.
Further preferably, the thermal conductivity factor of the vacuum heat-insulating plate of lowest part is the heat conductivity of vacuum insulation panel of topmost
1.18-1.39 again.
Further preferably, the thickness of the vacuum heat-insulating plate of lowest part is 1.29 times of the vacuum insulation plate thickness of topmost.
By the setting of above-mentioned preferred thermal insulation board thermal conductivity factor, it is capable of the optimum efficiency of cost of implementation saving.
Preferably, the thickness of different vacuum heat-insulating plates is identical.
Preferably, along short transverse, the spacing between adjacent vacuum heat-insulating plate is identical.
As third preferred embodiment, as shown in figure 3, preferably, between adjacent vacuum heat-insulating plate 11
Spacing is different, along the short transverse of vertical portion 41（I.e. from the bottom up）, the spacing between adjacent vacuum heat-insulating plate 11
Constantly become smaller.It is different to pass through spacing so that along in short transverse, vacuum heat-insulating plate distribution is closer and closer, babinet it is total
Heat transfer coefficient is lower and lower, so that cabinet insulation effect is become better and better.
Because in a vapor generator, because the water that density reasons cause temperature high is walked upwards, the low water of temperature is walked downwards,
Therefore the temperature of the water of steam generator lower part will be less than the temperature of the water on steam generator top.Lead to steam generator in this way
The internal-external temperature difference of lower part is less than the temperature difference on steam generator top.The utility model is directed to this case, by setting vacuum
Heat-insulating shield is different in the adjacent spacing of different height, so that the heat insulation effect taken of different location is different.On top
The adiabatic plate spacing of setting is small, targetedly increases the heat insulation effect of lower part.It sets by doing so so that essentially identical realizing
In the case of heat preservation, more than 13% cost can be saved.Meanwhile in the case where spending identical cost, can improve 12% with
On heat insulation effect.
Further preferably, along the short transverse of vertical portion 41, the ever-reduced amplitude of 11 spacing of vacuum heat-insulating plate is not
Disconnected increase.
It is found by numerical simulation and experiment, the setting changed by amplitude can meet temperature change well
The regularity of distribution, so as to further reach the technique effect for reducing cost and improving heat preservation.
Further preferably, the spacing of the vacuum heat-insulating plate of topmost is the 0.85- of the vacuum insulation plate spacing of lowest part
0.92 times.
Further preferably, the spacing of the vacuum heat-insulating plate of topmost is 0.88 times of the vacuum insulation plate spacing of lowest part.
By the setting of above-mentioned preferred heat preservation plate spacing, it is capable of the optimum efficiency of cost of implementation saving.
Preferably, the thickness of different vacuum heat-insulating plates is identical.
Preferably, the thermal conductivity factor of different vacuum heat-insulating plates is identical.
Preferably, three above-mentioned embodiments can be combined.
As shown in figure 4, the cold water inlet 3 is arranged on the lower part of babinet 1, the hot water goes out 4 mouthfuls and is located at the upper of 1 body of case
Portion.The electric heating tube 2 is arranged in babinet, and the electric heating tube 2 is set for vertical direction（It is set perpendicular to water tank bottom plane
It puts）, electric heating tube 2 includes outer tube 21 and the electric heater that is arranged in outer tube 21, and 2 lower part of the electric heating tube setting water inlet is logical
Road, ensureing the water of babinet 1 can be heated into electric heating tube 2, the top connection steam (vapor) outlet 5 of electric heating tube 2.
Preferably, the outer tube of 5 pipeline of steam (vapor) outlet and electric heating tube 2 is to be tightly connected.
Preferably, the outer diameter of 5 pipeline of steam (vapor) outlet is less than the outer diameter of the outer tube of electric heating tube 2.It can ensure to steam in this way
The vapour velocity of discharge.
Cold water enters babinet by cold water inlet 3.When being worked, electric heating tube 2 is arranged in babinet 1, in babinet 1
Water enters electric heating tube 2 by the trepanning 25 on outer tube 21, is then heated in electric heating tube 2, the steaming generated after heating
Vapour is discharged by steam (vapor) outlet 5.Meanwhile electric heating tube is while steam is generated, while the water in heating compartment, is produced after heating
Raw hot water can be utilized by hot water outlet.
By above-mentioned structure setting, steam and hot water can be generated simultaneously so that function that there are many steam generating appliances,
Its range utilized is expanded, and the steam generated is directly discharged by the steam (vapor) outlet being connect with electric heating tube, because being
Water outside electric heating tube is heated by outer tube 21, thus external water will not explosive evaporation, also ensure the safety of heating
Property.
The utility model is set by electric heating tube 2 for vertical direction, can to heat water in the vertical direction so that
Water continuous heating in uphill process, the electric heating tube set relative to horizontal direction, further improves the efficiency of heating surface.
As an improvement, hot water outlet 4 can be removed, such as shown in figure 5, only using steam generator as one
Generate the simple function evaporator of steam.
Preferably, 1 top of the babinet setting exhaust outlet 6.By setting exhaust outlet 6,1 internal pressure of babinet is avoided
It is excessive, it is ensured that safety.
Preferably, the cross section of the babinet is rectangular, preferred cube.
Preferably, the cross section of the electric heating tube 2 is round.
Preferably, the electric heating tube 2 is arranged on the centre position of babinet.It sets by doing so, ensures hot water heating
Uniformity.
Preferably, the outer diameter of the outer tube 21 of the electric heating tube 2 is 0.3-0.45 times of the internal diameter of babinet 1.Further
Preferably 0.35-0.40 times.
Preferably, intake tunnel is strip slot.
Preferably, intake tunnel is trepanning 25.As shown in Figure 8.It should be noted that be only schematic diagram in Fig. 8, though
1 or a rows of openings 25 of setting are only shown in right Fig. 8 between adjacent electrically heated rod 22, is actually not only limited to
In one either a row can be set on the upper-lower position between adjacent electrically heated rod 22 it is multiple or multiple rows of.
Preferably, 25 shape of trepanning can be round or rectangular.
Preferably, the trepanning 25 is arranged on less than 50% 1 water level of babinet.It sets by doing so, can ensure water energy
It is enough to be timely internally heated into electric heating tube 2, while trepanning 25 is also avoided, which to set, excessively high causes steam excessive from trepanning 25
Go out, avoid pressure in entire babinet excessive, while the water of eminence was also avoided to enter in electric heating tube, the steam generated is caused to take
The moisture of band is too many.
Preferably, along short transverse（That is direction from the bottom up, appear below along short transverse, if do not had
Specified otherwise, all referring to direction from the bottom up）, the trepanning 25 is set as multiple rows of.
It is multiple rows of by setting, it is ensured that different height and position water inlets avoids an independent position from intaking, causes to heat
It is uneven, while the water avoided enter into is evaporated, and causes to dry up in heating tube.
Preferably, along short transverse, the distribution density of the trepanning 25 is less and less.The density that trepanning 25 is distributed is got over
It is next smaller, that is, mean the fewer and fewer of trepanning distribution, the area of trepanning is also just less and less.
By a large amount of numerical simulation and its experimental studies have found that, by setting trepanning distribution density less and less, mainly
The reason is that ensureing that most of water is heated in lower part, constantly there is water to enter electric heating tube 2 in water becomes steam uphill process, hold
Continuous heating.If lower part water inlet is few, lower part water fast vaporizing may be caused, causes in electric heating tube 2 that pressure is excessive, is caused
The water in portion is also because pressure considerations cannot be introduced into electric heating tube.Reduce the dry of electric heating tube, while improve the efficiency of heating surface.
Further preferably, along short transverse, the amplitude that the distribution density of the trepanning 25 is less and less constantly increases.
By largely testing and numerical simulation, by the variation of above-mentioned trepanning distribution density, can further improve
The efficiency of heating surface improves the output efficiency of steam, while can reduce dry in electric heating tube.
Preferably, along short transverse, the area of single trepanning 25 is less and less.Further preferably, along height side
To the amplitude that the area of single trepanning 25 is less and less constantly increases.Specific reason referring to 25 distribution density of trepanning variation.
Preferably, along short transverse, the sum of described area per rows of openings 25 is less and less.Preferably, along
The less and less amplitude of the sum of short transverse, the area per rows of openings 25 is continuously increased.Specific reason is divided referring to trepanning 25
The variation of cloth density.
Preferably, along short transverse, the spacing between every rows of openings 25 is increasing.Preferably, along
Short transverse, the amplitude increasing per the spacing between rows of openings 25 are continuously increased.Specific reason is divided referring to trepanning 25
The variation of cloth density.
Preferably, the centrally disposed center electrically heated rod 24 axially of electric heating tube 2.
Preferably, along short transverse, the heating power of the unit length of electrically heated rod 24 is constantly reduced.By setting
The heating power for putting electrically heated rod 24 is constantly reduced, and ensures that the fluid of lower part quickly heats, then hot fluid passes through naturally right
Top is flowed to, the fluid outside the fluid on top and the electric heating tube 2 of its underpart rapidly enters, and can further improve heating
Efficiency.By largely testing and numerical simulation, by the variation of above-mentioned electric heater for heating power, can further improve
10% or so the efficiency of heating surface saves heating time.
Preferably, along short transverse, the amplitude of the continuous reduction of heating power of the unit length of electrically heated rod 24
It is continuous to increase.
It, can by the variation of above-mentioned 24 heating power amplitude of electrically heated rod by largely testing and numerical simulation
5% efficiency of heating surface is further improved, further saves heating time.
Preferably, electrically heated rod 24 divides for multistage, along short transverse, the heating power of the unit length of different sections is not
Together.Wherein along short transverse, the heating power of the unit length of different sections constantly reduces.Further preferably, reduction
Amplitude constantly increases.
Preferably, every section of length is identical.
Preferably, the heating power of every section of unit length is identical.
Specific reason is as above.
It is segmented by setting, it can be with further such that being simple to manufacture conveniently.
The electric heating tube 2 is along center electrically heated rod 24 to the more radial direction electrically heated rods 22 radially extended, the diameter
More are set on electrically heated rod 22 from 22 outwardly extending triangle cooling fin 23 of radial direction electrically heated rod.
The utility model is by setting radial direction electrically heated rod 22 and along 22 outwardly extending triangle of radial direction electrically heated rod
Shape cooling fin 23 can further improve the efficiency of heating surface, while increase heating surface (area) (HS, improve heating effect, and because setting
Triangle cooling fin passes through the triangular tip of the similar acicular texture of triangle cooling fin so that the vapor bubbles of generation exist
In uphill process, flow-disturbing can be further increased, cuts bubble so that air pocket turns to smaller bubble, further promotes vapour
The fusion of liquid promotes the heat exchange of vapour-liquid so that fluid is sufficiently mixed, improves heating effect.
Further preferably, radial direction electrically heated rod cross section is rectangle, preferably square.
Further preferably, radial direction electrically heated rod cross section is circle.
Preferably, 0.3-0.5 times of electrically heated rod centered on the heating power of radial direction electrically heated rod in unit length,
Preferably 0.4 times.
Preferably, the radial direction electrically heated rod 22 is shaft, from the center of circle along radially extending to electrical heating
The inner wall of pipe 21.
Preferably, multiple triangle cooling fins 23, multiple triangles are set on 22 on each radial direction electrically heated rod
Shape cooling fin 23 is similar figures.Three interior angles in correspondence with each other of i.e. different triangle cooling fins are identical.
Preferably, from the center of electric heating tube 21 to the inside pipe wall of electric heating tube 21, the length of side of triangle cooling fin 23
Or area is less and less.
Preferably, 22 both sides distribution triangle cooling fin 23 of radial direction electrically heated rod, triangle cooling fin 23 is along radially
The center line of electrically heated rod 22 is symmetrical.
Preferably, the distance between adjacent triangle cooling fin 23 of radial direction electrically heated rod 22 remains unchanged.
Preferably, from the center of electric heating tube 21 to radial direction, the heat dissipation of adjacent 22 triangle of radial direction electrically heated rod
Spacing between piece 23 constantly increases.
Constantly increased by the spacing between adjacent 22 triangle cooling fin 23 of radial direction electrically heated rod, can caused outer
Fluid amount of flow big local fluid circulation space in portion's is big, can further reduce flow resistance, heating effect is kept not substantially
Become.
Preferably, the triangle cooling fin 23 is right angled triangle cooling fin, the short side for forming right angle is located at diameter
On electrically heated rod, long side extends outwardly from radial direction electrically heated rod.
Preferably, the radial direction electrically heated rod 22 is round bar, a diameter of 0.6-1.2mm, preferably 0.8mm.
Preferably, triangle cooling fin extends outwardly from the central plane of round bar.The triangle cooling fin is tablet
Structure.The slab construction is perpendicular to center electrically heated rod 24, and slab construction extended surface passes through the center line of round bar.
It is learnt by numerical analysis and experiment, adjacent triangle cooling fin spacing cannot be too big, then can greatly very much
Cause cooling fin heat transfer area too small, augmentation of heat transfer effect is bad, but spacing can not be too small, and spacing is too small, causes in pipe
Fluid circulation space is too small, causes the resistance that steam flows in pipe 2 too big, similarly, the apex angle of triangle cooling fin cannot be too
Greatly, flow resistance can be also influenced very much greatly, and flow-disturbing effect can be caused bad greatly very much, but can not be too small, too
Heating surface (area) (HS is too small if small, can also influence heating effect.Therefore the utility model is from two side of heating effect and flow resistance
Face accounts for, therefore the utility model is through a large number of experiments, is preferentially meeting normal flow resistance（Always pressure-bearing is
Below 8Mpa）In the case of so that being optimal of heating effect has arranged the best relationship of parameters.
The opposite acute angle of the short side at the right angle is M, and the length of side of the long side at right angle is L, on same radial direction electrically heated rod 22
The adjacent distance of adjacent triangle cooling fin is S, then meets following requirement：
tan(M)=a*tan(S/L)3-b*(S/L)2+ c* (S/L)-d, wherein tan is trigonometric function, and a, b, c, d are ginsengs
Number；
61.0<a<61.5, preferably a=61.295,
60.0<b<60.5, preferably b=60.267,
21<c<22, preferably c=21.412,
2.2<d<2.3, preferably d=2.2734
4<M<35 °, preferably 8<M<25°
0.18< S/L <0.38,0.25R<L<0.32 R。
R is the distance at the midpoint on the side at the place for being located at axial cooling fin 22 from 2 center of circle of electric heating tube to right angled triangle.
Wherein adjacent distance S be the place for being located at axial cooling fin 22 with adjacent triangle cooling fin side between
Away from；I.e. triangle cooling fin be located at the place of axial cooling fin 22 side rear end and rear triangular be located at axial cooling fin 22
The distance between the side front end at place.Referring specifically to the mark of Fig. 7.
Preferably, radial direction electrically heated rod 22 is set as 7-9 roots, the angle formed between adjacent radial direction electrically heated rod 22
It is equal.Further preferably 8.
The length of side L of the long side at right angle chooses being averaged for the length of side of the long side at two right angles of adjacent triangle cooling fin
Value.
Further preferably, the internal diameter of electric heating tube is 25-40mm.
Preferably, electric heating tube is straight tube.
Preferably, the heating power of steam generator is 2000-4000W, preferably 2500-3500W.
Preferably, electrically heated rod 24,22 is resistance heater, it is long to change unit by setting the diameter of resistance
The variation of the heating power of degree.
Preferably, along short transverse, the distance between neighbouring radial direction electrically heated rod 22 is increasing.Into one
Step is preferred, and along short transverse, the increasing amplitude of the distance between adjacent radial direction electrically heated rod 22 constantly increases.
Preferably, along short transverse, the heating power of the unit length of different radial direction electrically heated rods 22 is increasingly
It is small.Further preferably, the less and less amplitude of different 22 unit length heating powers of radial direction electrically heated rod constantly increases.
By the heating power of electrically heated rod 22 is set constantly to reduce in the height direction or the distance between it is more next
It is bigger, ensure that the fluid of lower part quickly heats, then hot fluid has arrived top, the fluid on top and its underpart by free convection
Electric heating tube 2 outside fluid rapidly enter, the efficiency of heating surface can be further improved.By largely testing and Numerical-Mode
Intend, by the variation of above-mentioned electric heater for heating power, the 8-10% efficiencies of heating surface can be further improved, when saving heating
Between.
Although the utility model has been disclosed in the preferred embodiments as above, the utility model is not limited to this.Any
Field technology personnel without departing from the spirit and scope of the utility model, can make various changes or modifications, therefore this practicality
Novel protection domain should be subject to claim limited range.
Claims (9)
1. a kind of steam generator of heat conductivity of vacuum insulation panel variation, the steam generator include babinet, electric heating tube,
Cold water inlet and steam (vapor) outlet, the babinet include vertical portion and horizontal component, and the vertical portion includes inner and outer wall,
Vacuum heat-insulating plate is set between the inner and outer wall, thermal insulation material is filled in space between vacuum heat-insulating plate, inner and outer wall,
It is characterized in that, the thermal conductivity factor of the vacuum heat-insulating plate is different, and along the short transverse of vertical portion, vacuum heat-insulating plate 11 is led
Hot coefficient constantly reduces.
2. steam generator as described in claim 1, which is characterized in that along the short transverse of vertical portion, vacuum insulation
The amplitude that plate thermal conductivity factor constantly reduces constantly increases.
3. steam generator as described in claim 1, which is characterized in that the thermal conductivity factor of the vacuum heat-insulating plate of lowest part is most
1.18-1.39 times of the heat conductivity of vacuum insulation panel on top.
4. steam generator as claimed in claim 3, which is characterized in that the thickness of the vacuum heat-insulating plate of lowest part is topmost
1.29 times of vacuum insulation plate thickness.
5. steam generator as described in claim 1, which is characterized in that the cold water inlet is arranged on the side wall of babinet,
The babinet top setting exhaust outlet, the electric heating tube are arranged in babinet, and the electric heating tube includes outer tube and setting
Electric heater in outer tube, the electric heating tube are set for vertical direction, and the electric heating tube lower part sets intake tunnel, are protected
The water of card babinet can be heated into electric heating tube, the top connection steam (vapor) outlet of electric heating tube.
6. steam generator as claimed in claim 5, which is characterized in that the outer diameter of steam (vapor) outlet pipeline is less than electric heating tube
The outer diameter of outer tube.
7. steam generator as claimed in claim 5, which is characterized in that the cross section of the babinet is rectangular, the electricity
The cross section of heating tube is round.
8. steam generator as claimed in claim 5, which is characterized in that the centrally disposed axially side of the electric heating tube
To center electrically heated rod and along center electrically heated rod to the more radial direction electrically heated rods radially extended, the radial direction electricity adds
More are set on hot pin from the outwardly extending triangle cooling fin of radial direction electrically heated rod.
9. steam generator as claimed in claim 8, which is characterized in that the triangle cooling fin is that right angled triangle dissipates
Backing, the short side for forming right angle are located in radial bars, and long side extends outwardly from radial bars；Setting is more on each radial direction electrically heated rod
A triangle cooling fin, multiple triangle cooling fins are similar figures；
The opposite acute angle of the short side at the right angle is M, and the length of side of the long side at right angle is L, adjacent on same radial direction electrically heated rod
The adjacent distance of triangle cooling fin is S, then meets following requirement：
tan(M)=a*tan(S/L)3-b*(S/L)2+ c* (S/L)-d, wherein tan is trigonometric function, and a, b, c, d are parameters；
61.0<a<61.5,
60.0<b<60.5,
21<c<22,
2.2<d<2.3,4<M<35 °,
0.18< S/L <0.38。
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| CN201721178160.0U CN207539876U (en) | 2017-09-14 | 2017-09-14 | A kind of steam generator of heat conductivity of vacuum insulation panel variation |
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|---|---|---|---|
| CN201721178160.0U CN207539876U (en) | 2017-09-14 | 2017-09-14 | A kind of steam generator of heat conductivity of vacuum insulation panel variation |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109323227A (en) * | 2017-09-14 | 2019-02-12 | 山东交通学院 | A kind of steam generator of heat conductivity of vacuum insulation panel variation |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109323227A (en) * | 2017-09-14 | 2019-02-12 | 山东交通学院 | A kind of steam generator of heat conductivity of vacuum insulation panel variation |
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