CN109323227A - 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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- CN109323227A CN109323227A CN201710827153.7A CN201710827153A CN109323227A CN 109323227 A CN109323227 A CN 109323227A CN 201710827153 A CN201710827153 A CN 201710827153A CN 109323227 A CN109323227 A CN 109323227A
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- Prior art keywords
- steam generator
- electric heating
- heating tube
- insulating plate
- steam
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B1/00—Methods of steam generation characterised by form of heating method
- F22B1/28—Methods of steam generation characterised by form of heating method in boilers heated electrically
- F22B1/284—Methods of steam generation characterised by form of heating method in boilers heated electrically with water in reservoirs
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B37/00—Component parts or details of steam boilers
- F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
- F22B37/36—Arrangements for sheathing or casing boilers
Abstract
The present invention provides a kind of steam generators of heat conductivity of vacuum insulation panel variation, the steam generator includes cabinet, electric heating tube, cold water inlet and steam (vapor) outlet, the cabinet 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 coefficient of the vacuum heat-insulating plate is different, along the short transverse of vertical portion, the thermal coefficient of vacuum heat-insulating plate 11 is constantly reduced.Steam generator of the invention can reduce the cost of evaporator while realizing essentially identical insulating efficiency by the design of the variation of heat conductivity of vacuum insulation panel in short transverse.
Description
Technical field
The present invention relates to boiler technology field more particularly to a kind of steam generators of Novel structure.
Background technique
Steam generator is the mechanical equipment for water being heated as using the thermal energy of fuel or other energy steam.Steam hair
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 mostly uses combustion gas or fuel Heating, and heating efficiency is low, and currently used electricity
Hot steam generator is directly heated and is generated to the water in water tank to the bottom of storage tank using electrothermal tube setting mostly
Steam.There is heating slowly, the low problem of the thermal efficiency in this electric heating steam generator.
As Chinese patent literature CN2071061U disclose it is a kind of for beauty, health care the effects of steam generating appliances, packet
It includes metal electrode board and the shell made of heat resistant plastice, go out vapour cover board, interior panelling, flexible handle, metal electrode board is necessary
Power on through power supply line, there are internal baffles in shell, it is suitable for reading to have vapour cover board out, there is socket slot that can insert with band outside shell bottom
The flexible handle of mouth is connected.For another example a kind of improved electric-heating steam generation disclosed in Chinese patent literature CN2651594Y
Device, for generating steam, including body cavity and electric heater, electric heater are placed in body cavity, are equipped in body cavity
Partition separates cavity above and below, and upper cavity is vapor cavity, and lower chamber is heating water cavity, and partition is equipped with steaming hole；Partition
There are 2-6 layers, form transition chamber between partition, the steaming hole on adjacent partition, which misplaces, to be arranged.Electric heater will heat in water cavity
Water heating, steam is entered spare in vapor cavity by the transition chamber of partition 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 shell, 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.So particularly important as steam generator heat-preserving wall using light-duty material.
Vacuum heat-insulating plate (VIP plate), is one of vacuum thermal insulating material, is answered by filling core material and vacuum protection surface layer
It closes, it is effectively prevented from the transmitting of heat caused by cross-ventilation, therefore thermal coefficient can be greatly lowered, and is less than 0.003w/
Mk, and without containing any ODS material, there is environmental protection and energy-efficient characteristic, be state-of-the-art efficient in the world at present
Thermal insulation material.And also has at present and vacuum heat-insulating plate is applied to water tank heat preserving, such as CN202339023A for 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 coefficient difference and use
The cost requirement of vacuum heat-insulating plate caused by the reasons such as vacuum heat-insulating plate quantity is not also high.Vacuum insulation plate thickness is bigger, heat preservation
Effect is better, but increased costs are also very much, and thermal coefficient 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 present invention provides a kind of new steam generator, come
While reaching completion heat insulation effect, have the function that save cost.
Summary of the invention
It is exhausted by vacuum the purpose of the present invention is to provide a kind of steam generator of heat conductivity of vacuum insulation panel variation
Hot plate thermal coefficient changes to reach saving cost, improves heat insulation effect.
To achieve the above object, the present invention adopts the following technical scheme:
A kind of steam generator, the steam generator include cabinet, electric heating tube, cold water inlet and steam (vapor) outlet, the case
Body includes vertical portion and horizontal component, and the vertical portion includes inner and outer wall, is arranged between the inner and outer wall true
Empty heat-insulating shield, thermal insulation material is filled in space between vacuum heat-insulating plate, inner and outer wall, and the thermal coefficient of the vacuum heat-insulating plate is not
Together, along the short transverse of vertical portion, the thermal coefficient of vacuum heat-insulating plate 11 is constantly reduced.
Preferably, the amplitude that heat conductivity of vacuum insulation panel constantly reduces is continuous along the short transverse of vertical portion
Increase.
Preferably, the thermal coefficient 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 setting is on the side wall of the box body, exhaust outlet is arranged in the cabinet top, described
Electric heating tube is arranged in cabinet, and the electric heating tube includes outer tube and the electric heater that is arranged in outer tube, the electric heating
Pipe is that vertical direction is arranged, and intake tunnel is arranged in the electric heating tube lower part, guarantee the water of cabinet be able to enter electric heating tube into
The top of row heating, electric heating tube connects steam (vapor) outlet.
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 cabinet be it is rectangular, the cross section of the electric heating tube is round.
Preferably, the middle position of cabinet is arranged in the electric heating tube.
Preferably, the outer diameter of the outer tube of the electric heating tube is 0.3-0.45 times of the internal diameter of cabinet.
Preferably, intake tunnel is strip slot.
Preferably, 50% or less cabinet water level is arranged in the intake tunnel.
Preferably, the center setting center electrically heated rod axially of the electric heating tube and along center
Electrically heated rod is arranged more from radial electrically heated rod on the radial direction electrically heated rod to the more root diameters radially extended to electrically heated rod
Outwardly extending triangle cooling fin.
Preferably, the triangle cooling fin is right angled triangle cooling fin, shape short side at right angle is located at radial
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 side length 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 require:
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 °, preferably 8 < M < 25 °
0.18< S/L <0.38。
The present invention has the advantage that
1) heat conductivity of vacuum insulation panel of steam generator of the present invention changes along short transverse, by thermal coefficient variation come
Reach saving cost, heat insulation effect is turned up.
2) by the present invention in that using vacuum heat-insulating plate cooperation polyurethane as library plate thermal insulation material, cabinet is substantially increased
Thermal insulation property, the more energy conservation and environmental protection compared with conventional steam generator.
3) steam generator that the present invention devises a kind of Novel structure can pass through a device by such structure
Can be realized quickly provide steam, and the steam generator have heating rapidly, uniformity of temperature profile, safe and reliable function
Can, improve heating efficiency.
4) present invention is by the aperture of setting electric heating tube bottom along the distribution density in short transverse, area and more
The setting of the spacing variation of rows of openings, further improves heating efficiency, improves the security performance of steam generator.
5) present invention devises new-type vertical tubular electric heating tube, and electric heating tube top is directly connected to steam (vapor) outlet,
By such mechanism, heating efficiency can be further improved.
6) present invention devises electrical heating efficiency along the variation of short transverse, can further increase the safety of device
Energy and heating properties.
7) present invention devises the electric heating tube of new-type interior heat radiating fin structure, passes through the triangle of Novel structure electric heating tube
Cooling fin increases the disturbance of heating surface (area) (HS and fluid, improves heating effect.
8) present invention passes through numerical simulation and many experiments, it is determined that the optimal relationship of interior cooling fin further increases
Heating effect, is also related to providing an optimal reference frame for the electric heating tube of such structure.
Detailed description of the invention:
Fig. 1 is the structural schematic diagram of steam generator casing of the invention；
Fig. 2 is steam generator casing vertical portion thickness change preferred embodiment schematic diagram of the present invention；
Fig. 3 is that steam generator casing vertical portion spacing of the present invention changes preferred embodiment schematic diagram；
Fig. 4 is the steam generator preferred structure schematic diagram that the present invention generates hot water and steam.
Fig. 5 is the steam generator preferred structure schematic diagram for only generating steam of the invention.
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- cabinet；2- electric heating tube；3- cold water inlet；4- hot water outlet；5- steam (vapor) outlet；6- exhaust outlet；
11- vacuum heat-insulating plate；12- hard polyurethane foam；
21- outer tube；22- radial direction electrically heated rod；23- triangle cooling fin；The center 24- electrically heated rod；25- aperture
41- vertical portion, 42- horizontal component, 411- inner wall, 412- outer wall.
Specific embodiment
Fig. 1-8 illustrates a kind of steam generator.As shown in figure 4, the steam generator includes cabinet 1, electric heating tube
2, cold water inlet 3, hot water outlet 4 and steam (vapor) outlet 5.
Cabinet 1 includes vertical portion 41 and horizontal component 42, as shown in Figure 1, the vertical portion 41 includes 411 He of inner wall
Vacuum heat-insulating plate 11, vacuum heat-insulating plate 11, inner wall 411 and outer wall is arranged in outer wall 412 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 (i.e. from the bottom up) of part 41, the thickness of vacuum heat-insulating plate 11 constantly increase.By thickness difference, so that edge
In short transverse, total heat transfer coefficient of cabinet 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 make 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 lower 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 present invention is directed to this case, by the way that vacuum is arranged
Heat-insulating shield is different in the thickness of different height, so that the heat insulation effect of different location taken is different.It is arranged on top thick
Heat-insulating shield, targetedly increase top heat insulation effect.By so set, making in the feelings for realizing essentially identical heat preservation
Under condition, 15% or more cost can be saved.Meanwhile in the case where spending identical cost, 13% or more heat preservation can be improved
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.
Temperature change can be met well by numerical simulation and experiment discovery, the setting changed by amplitude
The regularity of distribution, so that further reaching reduces the technical effect that cost improves 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, the optimum efficiency of cost savings can be realized.
Preferably, the material of different vacuum heat-insulating plates is identical.
Preferably, the thermal coefficient of different vacuum heat-insulating plates is identical.
Preferably, the spacing between adjacent vacuum heat-insulating plate is identical along short transverse.
As second preferred embodiment, preferably, the thermal coefficient of the vacuum heat-insulating plate 11 is different, along perpendicular
The short transverse (i.e. from the bottom up) of straight part 41, the thermal coefficient of vacuum heat-insulating plate 11 constantly reduce.Pass through thermal coefficient
Difference, so that total heat transfer coefficient of cabinet is lower and lower along in short transverse, so that cabinet insulation effect is increasingly
It is good.
Because the low water of temperature is walked downwards in a vapor generator, because the water that density reasons make temperature high is walked upwards,
Therefore the temperature of the water of steam generator lower part will be lower 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 present invention is directed to this case, by the way that vacuum insulation is arranged
Plate is different in the thermal coefficient of different height, so that the heat insulation effect of different location taken is different.On top, setting is led
The low heat-insulating shield of hot coefficient targetedly increases the heat insulation effect on top.By so set, making essentially identical in realization
In the case where heat preservation, 15% or more cost can be saved.Meanwhile in the case where spending identical cost, can be improved 13% with
On heat insulation effect.
Further preferably, the width constantly reduced along the short transverse of vertical portion 41,11 thermal coefficient of vacuum heat-insulating plate
Degree is continuous to be increased.
Temperature change can be met well by numerical simulation and experiment discovery, the setting changed by amplitude
The regularity of distribution, so that further reaching reduces the technical effect that cost improves heat preservation.
Further preferably, the thermal coefficient 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 insulation board thermal coefficient, the optimum efficiency of cost savings can be realized.
Preferably, the thickness of different vacuum heat-insulating plates is identical.
Preferably, the spacing between adjacent vacuum heat-insulating plate is identical along short transverse.
As third preferred embodiment, as shown in figure 3, preferably, between adjacent vacuum heat-insulating plate 11
Spacing is different, the spacing along the short transverse (i.e. from the bottom up) of vertical portion 41, between adjacent vacuum heat-insulating plate 11
Constantly become smaller.By spacing difference, so that along in short transverse, vacuum heat-insulating plate distribution is closer and closer, cabinet it is total
Heat transfer coefficient is lower and lower, so that cabinet insulation effect is become better and better.
Because the low water of temperature is walked downwards in a vapor generator, because the water that density reasons make temperature high is walked upwards,
Therefore the temperature of the water of steam generator lower part will be lower 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 present invention is directed to this case, by the way that vacuum insulation is arranged
Plate is different in the adjacent spacing of different height, so that the heat insulation effect of different location taken is different.It is arranged on top
Insulation plate spacing is small, targetedly increases the heat insulation effect of lower part.By so set, realizing essentially identical heat preservation
In the case where, 13% or more cost can be saved.Meanwhile in the case where spending identical cost, 12% or more can be improved
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.
Temperature change can be met well by numerical simulation and experiment discovery, the setting changed by amplitude
The regularity of distribution, so that further reaching reduces the technical effect that cost improves 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, the optimum efficiency of cost savings can be realized.
Preferably, the thickness of different vacuum heat-insulating plates is identical.
Preferably, the thermal coefficient of different vacuum heat-insulating plates is identical.
Preferably, three above-mentioned embodiments can be combined.
As shown in figure 4, the lower part of cabinet 1 is arranged in the cold water inlet 3, 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 cabinet, and the electric heating tube 2 is that vertical direction setting (is set perpendicular to water tank bottom plane
Set), electric heating tube 2 includes outer tube 21 and the electric heater being arranged in outer tube 21, and 2 lower part of the electric heating tube setting water inlet is logical
Road guarantees that the water of cabinet 1 is able to enter electric heating tube 2 and is heated, and the top of electric heating tube 2 connects steam (vapor) outlet 5.
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 guarantee to steam in this way
The vapour velocity of discharge.
Cold water enters cabinet by cold water inlet 3.When being worked, electric heating tube 2 is arranged in cabinet 1, in cabinet 1
Water enters electric heating tube 2 by the aperture 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 generating steam, while the intracorporal water of heater box, produces 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 there are many steam generating appliances,
Its range utilized is expanded, and the steam generated is directly discharged by the steam (vapor) outlet connecting with electric heating tube, because being
Heat the water outside electric heating tube by outer tube 21, thus external water will not explosive evaporation, also ensure the safety of heating
Property.
The present invention is vertical direction setting by electric heating tube 2, can to heat water in the vertical direction, so that water exists
Continuous heating in uphill process, the electric heating tube being arranged relative to horizontal direction, further improves heating efficiency.
It is improved as one, 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, exhaust outlet 6 is arranged in 1 top of cabinet.By the way that exhaust outlet 6 is arranged, 1 internal pressure of cabinet is avoided
It is excessive, it is ensured that safety.
Preferably, the cross section of the cabinet is rectangular, preferred cube.
Preferably, the cross section of the electric heating tube 2 is round.
Preferably, the middle position of cabinet is arranged in the electric heating tube 2.By so set, guaranteeing 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 cabinet 1.Further
Preferably 0.35-0.40 times.
Preferably, intake tunnel is strip slot.
Preferably, intake tunnel is aperture 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 for only showing setting in right Fig. 8 between adjacent electrically heated rod 22, actually not only limit to
In one perhaps a row can be arranged on the upper and lower position between adjacent electrically heated rod 22 it is multiple or multiple rows of.
Preferably, 25 shape of aperture can be circle or rectangular.
Preferably, 50% or less 1 water level of cabinet is arranged in the aperture 25.By so set, can guarantee water energy
Enough electric heating tubes 2 that timely enters are internally heated, while also avoiding aperture 25 from being arranged excessively high causes steam to overflow from aperture 25
Out, it avoids pressure in entire cabinet excessive, while the water of eminence also being 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 (i.e. direction from the bottom up, appear below along short transverse, if do not had
Specified otherwise all refers to direction from the bottom up), the aperture 25 is set as multiple rows of.
It is multiple rows of by being arranged, 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, the distribution density of the aperture 25 is smaller and smaller along short transverse.The density that aperture 25 is distributed is got over
It is next smaller, that is, mean the fewer and fewer of aperture distribution, the area of aperture is also just smaller and smaller.
By a large amount of numerical simulation and its experimental studies have found that, by setting aperture distribution density it is smaller and smaller, mainly
The reason is that guaranteeing that most of water is heated in lower part, becomes constantly there is water to enter electric heating tube 2 in steam uphill process in water, hold
Continuous heating.If lower part water inlet is few, lower part water fast vaporizing may cause, cause in electric heating tube 2 that pressure is excessive, cause
The water in portion is also because pressure considerations cannot be introduced into electric heating tube.Reduce the dry of electric heating tube, while improving heating efficiency.
Further preferably, along short transverse, the amplitude that the distribution density of the aperture 25 is smaller and smaller constantly increases.
By largely testing and numerical simulation is by the variation of above-mentioned aperture distribution density to further increase
Heating efficiency improves the output efficiency of steam, while can reduce dry in electric heating tube.
Preferably, the area of single aperture 25 is smaller and smaller along short transverse.Further preferably, along height side
To the amplitude that the area of single aperture 25 is smaller and smaller constantly increases.Specific reason referring to 25 distribution density of aperture variation.
Preferably, the sum of area of every rows of openings 25 is smaller and smaller along short transverse.Preferably, along
Short transverse, the smaller and smaller amplitude of the sum of area of every rows of openings 25 are continuously increased.Specific reason is divided referring to aperture 25
The variation of cloth density.
Preferably, the spacing between every rows of openings 25 is increasing along short transverse.Preferably, along
Short transverse, the increasing amplitude of spacing between every rows of openings 25 are continuously increased.Specific reason is divided referring to aperture 25
The variation of cloth density.
Preferably, the center electrically heated rod 24 of 2 center of electric heating tube setting axially.
Preferably, the heating power of the unit length of electrically heated rod 24 is constantly reduced along short transverse.By setting
The heating power for setting electrically heated rod 24 is constantly reduced, and guarantees that the fluid of lower part quickly heats, and then hot fluid passes through nature pair
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 increase heating
Efficiency.By largely testing and numerical simulation is by the variation of above-mentioned electric heater for heating power to further increase
10% or so heating efficiency saves heating time.
Preferably, along short transverse, the amplitude of the continuous reduction of the heating power of the unit length of electrically heated rod 24
It is continuous to increase.
By largely testing and numerical simulation can by the variation of above-mentioned 24 heating power amplitude of electrically heated rod
5% heating efficiency is further increased, 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 is constantly reduced.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 further such that being simple to manufacture conveniently.
The electric heating tube 2 is along center electrically heated rod 24 to the more root diameters radially extended to electrically heated rod 22, the diameter
More are arranged on electrically heated rod 22 from the outwardly extending triangle cooling fin 23 of radial electrically heated rod 22.
The present invention is by being arranged radial electrically heated rod 22 and dissipating along the outwardly extending triangle of radial electrically heated rod 22
Backing 23 can be further improved heating efficiency, while increase heating surface (area) (HS, improve heating effect, and because setting triangle
Shape cooling fin, by the triangular tip of the similar acicular texture of triangle cooling fin, so that the vapor bubbles generated are rising
In the process, flow-disturbing can be further increased, bubble is cut, so that air pocket turns to smaller bubble, further promotes vapour-liquid
Fusion, the heat exchange for promoting vapour-liquid are sufficiently mixed fluid, improve heating effect.
Further preferably, radial electrically heated rod cross section is rectangle, is preferably square.
Further preferably, radial electrically heated rod cross section is circle.
Preferably, the heating power of the radial electrically heated rod in unit length is 0.3-0.5 times of center electrically heated rod,
Preferably 0.4 times.
Preferably, the radial electrically heated rod 22 is shaft, electric heating is extended to from the center of circle along radial
The inner wall of pipe 21.
Preferably, multiple triangle cooling fins 23, multiple triangles are arranged 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 side length of triangle cooling fin 23
Or area is smaller and smaller.
Preferably, 22 two sides distribution triangle cooling fin 23 of radial electrically heated rod, triangle cooling fin 23 is along radial direction
The center line of electrically heated rod 22 is symmetrical.
Preferably, adjacent the distance between the triangle cooling fin 23 of radial electrically heated rod 22 remains unchanged.
Preferably, from the center of electric heating tube 21 to radial direction, adjacent 22 triangle of radial electrically heated rod radiates
Spacing between piece 23 constantly increases.
Constantly increased by the spacing between adjacent 22 triangle cooling fin 23 of radial electrically heated rod, can be made outer
Fluid amount of flow big local fluid circulation space in portion's is big, can further decrease flow resistance, heating effect is kept not substantially
Become.
Preferably, the triangle cooling fin 23 is right angled triangle cooling fin, shape short side at right angle is located at diameter
To on electrically heated rod, long side extends outwardly from radial 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 plate
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, and the resistance for causing steam to flow in pipe 2 is too big, and similarly, the apex angle of triangle cooling fin cannot be too
Greatly, also will affect flow resistance if too big, and it is too big if to will lead to flow-disturbing effect bad, but can not be too small, too
Heating surface (area) (HS is too small if small, also will affect heating effect.Therefore the present invention is come in terms of heating effect and flow resistance two
It accounts for, therefore the present invention is through a large number of experiments, is preferentially meeting normal flow resistance (total pressure-bearing is 8Mpa or less)
In the case where, so that being optimal of heating effect, has arranged the optimal relationship of parameters.
The opposite acute angle of the short side at the right angle is M, and the side length 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 require:
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, 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 for being located at the midpoint on the side at place of axial cooling fin 22 from 2 center of circle of electric heating tube to right angled triangle.
Wherein adjacent distance S is between being located between the side at the place of axial cooling fin 22 with adjacent triangle cooling fin
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 electrically heated rod 22 is set as 7-9 root, the angle formed between adjacent radial electrically heated rod 22
It is equal.Further preferably 8.
The side length L of the long side at right angle chooses being averaged for the side length 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 the diameter that resistance is arranged
The variation of the heating power of degree.
Preferably, the distance between neighbouring radial electrically heated rod 22 is increasing along short transverse.Into one
Preferably, along short transverse, the increasing amplitude of the distance between adjacent radial electrically heated rod 22 constantly increases step.
Preferably, the heating power of the unit length of different radial electrically heated rods 22 is increasingly along short transverse
It is small.Further preferably, the smaller and smaller amplitude of different 22 unit length heating powers of radial electrically heated rod constantly increases.
By be arranged electrically heated rod 22 heating power in the height direction constantly reduce or the distance between it is more next
It is bigger, guarantee 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, heating efficiency can be further increased.By largely testing and Numerical-Mode
It is quasi-, by the variation of above-mentioned electric heater for heating power, 8-10% heating efficiency can be further increased, when saving heating
Between.
Although the present invention has been disclosed in the preferred embodiments as above, present invention is not limited to this.Any art technology
Personnel can make various changes or modifications, therefore protection scope of the present invention is answered without departing from the spirit and scope of the present invention
When being defined by the scope defined by the claims..
Claims (9)
1. a kind of steam generator of heat conductivity of vacuum insulation panel variation, the steam generator include cabinet, electric heating tube,
Cold water inlet and steam (vapor) outlet, the cabinet 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 coefficient 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 coefficient constantly reduces constantly increases.
3. steam generator as described in claim 1, which is characterized in that the thermal coefficient 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 the box body,
Exhaust outlet is arranged in the cabinet top, and the electric heating tube is arranged in cabinet, and the electric heating tube includes outer tube and setting
Electric heater in outer tube, the electric heating tube are vertical direction setting, and intake tunnel is arranged in the electric heating tube lower part, are protected
The water of card cabinet is able to enter electric heating tube and is heated, and the top of electric heating tube connects steam (vapor) outlet.
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 cabinet 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 center setting of the electric heating tube is axially square
To center electrically heated rod and along center electrically heated rod to the more root diameters radially extended to electrically heated rod, the radial electricity plus
More are arranged on hot pin from the outwardly extending triangle cooling fin of radial 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, shape short side at 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 side length 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 require:
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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| Application Number | Priority Date | Filing Date | Title |
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| CN201710827153.7A CN109323227B (en) | 2017-09-14 | 2017-09-14 | Steam generator with variable heat conductivity coefficient of vacuum insulation panel |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710827153.7A CN109323227B (en) | 2017-09-14 | 2017-09-14 | Steam generator with variable heat conductivity coefficient of vacuum insulation panel |
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| Publication Number | Publication Date |
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| CN109323227A true CN109323227A (en) | 2019-02-12 |
| CN109323227B CN109323227B (en) | 2020-03-24 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117109346A (en) * | 2023-10-25 | 2023-11-24 | 国网江苏省电力有限公司常州供电分公司 | Steam heat storage tank and heat preservation device thereof |
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| CN207539876U (en) * | 2017-09-14 | 2018-06-26 | 山东交通学院 | A kind of steam generator of heat conductivity of vacuum insulation panel variation |
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| CN103485429A (en) * | 2013-10-11 | 2014-01-01 | 广东电白建设集团有限公司 | HD-STP building outer wall ultra-thin vacuum insulated panel and construction process thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117109346A (en) * | 2023-10-25 | 2023-11-24 | 国网江苏省电力有限公司常州供电分公司 | Steam heat storage tank and heat preservation device thereof |
| CN117109346B (en) * | 2023-10-25 | 2024-01-02 | 国网江苏省电力有限公司常州供电分公司 | Steam heat storage tank and heat preservation device thereof |
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| CN109323227B (en) | 2020-03-24 |
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