CN207674410U - A kind of steam generator that upper and lower box vacuum insulation plate spacing is different - Google Patents

Abstract

The utility model provides a kind of steam generator that upper and lower box vacuum insulation plate spacing is different, the steam generator includes babinet, electric heating tube, cold water inlet and steam (vapor) outlet, the babinet includes inner and outer wall, vacuum heat-insulating plate is set between the inner and outer wall, vacuum heat-insulating plate, thermal insulation material is filled in space between inner and outer wall, the babinet includes upper box body, the vertical babinet of lower part box and connection upper box body and lower part box, the upper box body vacuum insulation plate spacing adjacent with lower part box is different, the wherein spacing of the adjacent vacuum heat-insulating plate for being smaller than upper box body of the adjacent vacuum heat-insulating plate of lower part box.The steam generator of the utility model can submit insulating efficiency by the different design of vacuum insulation plate spacing in upper and lower box while realizing essentially identical heat insulation effect, in the case of the cost or the identical cost that reduce evaporator.

Description

A kind of steam generator that upper and lower box vacuum insulation plate spacing is different

Technical field

The present invention relates 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 mostly uses 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 to the bottom of storage tank using electrothermal tube mostly, directly heats and generate to the water in water tank Steam.There is heating slowly, the low problem of the thermal efficiency 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 shell 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 shell, it is suitable for reading to have vapour cover board, there is socket slot that can be inserted 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 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, forms transition chamber between partition board, the steaming hole dislocation arrangement on adjacent partition board.Electric heater will heat 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 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 plates), is one kind in vacuum thermal insulating material, is answered by filling core material and vacuum protection surface layer It closes, it is effectively prevented from heat transmission caused by cross-ventilation, therefore thermal coefficient can be greatly lowered, and is less than 0.003w/ Mk, and without containing any ODS materials, there is environmental protection and energy-efficient characteristic, it is 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 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 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 cost increase is 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 generators, come While reaching completion heat insulation effect, have the function that save cost.

Invention content

The purpose of the present invention is to provide a kind of steam generators of upper and lower box vacuum insulation plate spacing variation, by true Empty thermal insulation plate spacing changes to reach saving cost, improves heat insulation effect.

To achieve the above object, the present invention adopts the following technical scheme that：

A kind of steam generator of heat conductivity of vacuum insulation panel variation, the steam generator includes babinet, electrical heating Pipe, cold water inlet and steam (vapor) outlet, the babinet include inner and outer wall, and vacuum insulation is arranged between the inner and outer wall Plate, between vacuum heat-insulating plate, inner and outer wall space fill thermal insulation material, the babinet include upper box body, lower part box and The adjacent vacuum insulation plate spacing of the vertical babinet of connection upper box body and lower part box, upper box body and lower part box is not Together, the wherein spacing of the adjacent vacuum heat-insulating plate for being smaller than upper box body of the adjacent vacuum heat-insulating plate of lower part box.

Preferably, the spacing of the vacuum heat-insulating plate of lower part box is the 0.88- of the vacuum insulation plate spacing of upper box body 0.94 times.

Preferably, the spacing of the vacuum heat-insulating plate of lower part box is 0.9 times of the vacuum insulation plate spacing of upper box body.

Preferably, the thermal insulation material is polyurethane.

Preferably, the cold water inlet is arranged on the side wall of babinet, exhaust outlet is arranged in the babinet top, described Electric heating tube is arranged in babinet, and the electric heating tube includes outer tube and the electric heater that is arranged in outer tube, the electrical heating Pipe is that vertical direction is arranged, and intake tunnel is arranged in the electric heating tube lower part, ensure the water of babinet can 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 babinet is rectangular, the cross section of the electric heating tube is round.

Preferably, the electric heating tube is arranged in 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 the 50% or less of babinet water level.

Preferably, the centrally disposed center electrically heated rod axially of the electric heating tube and along center Electrically heated rod is arranged more from radial electrically heated rod to the more root diameters radially extended to electrically heated rod 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 radial direction 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 acute angle that the short side at the right angle is opposite 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 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 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 invention has the advantages that：

1）The different design of the upper and lower box vacuum insulation plate spacing of evaporator of the present invention reaches section by spacing variation Heat insulation effect is turned up, or insulating efficiency is improved in identical cost in cost-saving.

2）By the present invention in that vacuum heat-insulating plate is used to coordinate polyurethane as library plate thermal insulation material, babinet is substantially increased Heat-insulating property, the more energy conservation and environmental protection compared with conventional steam generator.

3）The present invention devises a kind of steam generator of Novel structure, by such structure, can pass through a device It can realize and steam is quickly provided, and the steam generator has that heating is rapid, uniformity of temperature profile, safe and reliable work( Can, improve the efficiency of heating surface.

4）The present invention is by being arranged the trepanning of 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 the efficiency of heating surface, 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, the efficiency of heating surface can be further improved.

6）The present invention devises variation of the electrical heating efficiency along short transverse, can further increase the safety of device Energy and heating properties.

7）The 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）The 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 a best reference frame for the electric heating tube of such structure.

Description of the drawings：

Fig. 1 is the structural schematic diagram of the steam generator casing of the present invention；

Fig. 2 is steam generator casing upper and lower box thickness change preferred embodiment schematic diagram of the present invention；

Fig. 3 is that steam generator casing upper and lower box 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 present 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- 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；The centers 24- electrically heated rod；25- trepannings

41- vertical portions, 42- horizontal components, 411- inner walls, 412- outer walls.

Specific implementation mode

Fig. 1-8 illustrates a kind of steam generator.As shown in figure 4, the steam generator includes babinet 1, electric heating tube 2, cold water inlet 3, hot water outlet 4 and steam (vapor) outlet 5.

The babinet 1 includes inner wall 411 and outer wall 412, and vacuum heat-insulating plate is arranged between the inner wall 411 and outer wall 412 11, between vacuum heat-insulating plate 11, inner wall 411 and outer wall 412 space fill thermal insulation material, the babinet include upper box body 421, The vertical shell 41 of lower part box 422 and connection upper box body and lower part box.

It should be noted that the thickness change of the vacuum heat-insulating plate in order to illustrate upper and lower box, Fig. 2 do not show vertical portion The vacuum heat-insulating plate divided, it is not intended that vertical portion does not have vacuum heat-insulating plate.

As first preferred embodiment, as shown in Fig. 2, the vacuum heat-insulating plate of upper box body 411 and lower part box 412 11 thickness is different, and wherein 11 thickness of vacuum heat-insulating plate of upper box body 411 is less than 11 thickness of vacuum heat-insulating plate of lower part box 412 Degree.So that the integral heat insulation effect of lower part box is higher than upper box body.

Because in a vapor generator, although because the density reasons water that makes temperature high is upward inside steam generator It walks, the low water of temperature is walked downwards, therefore the coolant-temperature gage of steam generator lower part will be less than the temperature of the water on steam generator top, But because general between the water surface and upper box body on top all have a certain distance, and there is steam between this distance, And lower part water is directly contacted with lower part box, the thermal coefficient of gas is well below water, therefore lower part is easier heat conduction, Er Qieyin Also to be exposed in air outside upper box body, and lower part box is generally directly contacted with ground, or is not an exposure to air In, and the thermal coefficient of air is less than ground, therefore lower part box is easier to radiate relative to upper box body.The present invention is directed to this One situation, it is different with the thickness of lower part box in upper box body by the way that vacuum heat-insulating plate is arranged, so that upper box body is under The heat insulation effect of portion's babinet taken is different.In the thick heat-insulating shield of lower part box setting, targetedly increase upper box body Heat insulation effect.Pass through such setting so that in the case where realizing essentially identical heat preservation, 12% or more cost can be saved.Together When, in the case where spending identical cost, 12% or more heat insulation effect can be improved.

Preferably, the vacuum insulation plate thickness of lower part box is the 1.1-1.3 of the vacuum insulation plate thickness of upper box body Times.

Preferably, the vacuum insulation plate thickness of lower part box is 1.15 times of the vacuum insulation plate thickness of upper box body.

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 all vacuum heat-insulating plates.

Preferably, the thermal coefficient of all vacuum heat-insulating plates is identical.

Preferably, the vacuum heat-insulating plate that spacing between the adjacent vacuum heat-insulating plate of upper box body is adjacent with lower part box Between spacing it is identical.

As second preferred embodiment, the heat conduction system of the vacuum heat-insulating plate 11 of upper box body 411 and lower part box 412 Number is different, and wherein 11 thermal coefficient of vacuum heat-insulating plate of lower part box 411 is less than 11 heat conduction of vacuum heat-insulating plate of upper box body 412 Coefficient.So that the integral heat insulation effect of lower part box is higher than upper box body.

Because in a vapor generator, although because the density reasons water that makes temperature high is upward inside steam generator It walks, the low water of temperature is walked downwards, therefore the coolant-temperature gage of steam generator lower part will be less than the temperature of the water on steam generator top, But because general between the water surface and upper box body on top all have a certain distance, and there is steam between this distance, And lower part water is directly contacted with lower part box, the thermal coefficient of gas is well below water, therefore lower part is easier heat conduction, Er Qieyin Also to be exposed in air outside upper box body, and lower part box is generally directly contacted with ground, or is not an exposure to air In, and the thermal coefficient of air is less than ground, therefore lower part box is easier to radiate relative to upper box body.The present invention is directed to this One situation, it is different with the thermal coefficient of lower part box in upper box body by the way that vacuum heat-insulating plate is arranged, so that upper box body It is different with the heat insulation effect of lower part box taken.In the low heat-insulating shield of lower part box setting thermal coefficient, targetedly increase Add the heat insulation effect of upper box body.Pass through such setting so that in the case where realizing essentially identical heat preservation, 12% can be saved Above cost.Meanwhile in the case where spending identical cost, 12% or more heat insulation effect can be improved.

Further preferably, the thermal coefficient of the vacuum heat-insulating plate of lower part box is the vacuum heat-insulating plate heat conduction system of upper box body Several 0.85-0.95 times.

Further preferably, the thermal coefficient of the vacuum heat-insulating plate of lower part box is the vacuum heat-insulating plate heat conduction system of upper box body Several 0.9 times.

By the setting of above-mentioned preferred thermal insulation board thermal coefficient, it is capable of the optimum efficiency of cost of implementation saving.

Preferably, the thickness of all vacuum heat-insulating plates is identical.

Preferably, the vacuum heat-insulating plate that spacing between the adjacent vacuum heat-insulating plate of upper box body is adjacent with lower part box Between spacing it is identical.

As third preferred embodiment, preferably, as shown in figure 3, upper box body 411 and lower part box 412 Adjacent 11 spacing of vacuum heat-insulating plate is different, and the wherein adjacent vacuum heat-insulating plate 11 of lower part box 411 is smaller than top The spacing of the adjacent vacuum heat-insulating plate 11 of babinet 412.So that the integral heat insulation effect of lower part box is higher than upper box body.

Because in a vapor generator, although because the density reasons water that makes temperature high is upward inside steam generator It walks, the low water of temperature is walked downwards, therefore the coolant-temperature gage of steam generator lower part will be less than the temperature of the water on steam generator top, But because general between the water surface and upper box body on top all have a certain distance, and there is steam between this distance, And lower part water is directly contacted with lower part box, the thermal coefficient of gas is well below water, therefore lower part is easier heat conduction, Er Qieyin Also to be exposed in air outside upper box body, and lower part box is generally directly contacted with ground, or is not an exposure to air In, and the thermal coefficient of air is less than ground, therefore lower part box is easier to radiate relative to upper box body.The present invention is directed to this One situation, it is different with the spacing of lower part box in upper box body by the way that vacuum heat-insulating plate is arranged, so that upper box body is under The heat insulation effect of portion's babinet taken is different.In the low heat-insulating shield of lower part box setting thermal coefficient, targetedly in increase The heat insulation effect of portion's babinet.Pass through such setting so that in the case where realizing essentially identical heat preservation, 12% or more can be saved Cost.Meanwhile in the case where spending identical cost, 12% or more heat insulation effect can be improved.

Further preferably, the spacing of the vacuum heat-insulating plate of lower part box is the vacuum insulation plate spacing of upper box body 0.88-0.94 times.

Further preferably, the spacing of the vacuum heat-insulating plate of lower part box is the 0.9 of the vacuum insulation plate spacing of upper box body Times.

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 all vacuum heat-insulating plates is identical.

Preferably, the thermal coefficient of all 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 in 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 arranged for vertical direction（It is set perpendicular to water tank bottom plane It sets）, electric heating tube 2 includes outer tube 21 and the electric heater that is arranged in outer tube 21, and the setting water inlet of 2 lower part of the electric heating tube is logical Road ensures that the water of babinet 1 can be heated into electric heating tube 2, 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 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 generating steam, while the water in heating compartment, it 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 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 arranged by electric heating tube 2 for vertical direction, 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 the efficiency of heating surface.

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 babinet.By the way that exhaust outlet 6 is arranged, 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 in the centre position of babinet.By so set, ensureing 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 for only showing setting in right Fig. 8 between adjacent electrically heated rod 22, actually not only limit to In one either 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 the trepanning can be round or rectangular.

Preferably, the trepanning 25 is arranged the 50% or less of 1 water level of babinet.By so set, can ensure water energy It is enough to be timely internally heated into electric heating tube 2, while also avoiding trepanning 25 from being arranged excessively high causes steam excessive from trepanning 25 Go out, avoid pressure in entire babinet 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（That is 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 trepanning 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, along short transverse, the distribution density of the trepanning 25 is smaller and smaller.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 smaller and smaller.

By a large amount of numerical simulation and its experimental studies have found that, by be arranged trepanning distribution density it is smaller and smaller, 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 improving the efficiency of heating surface.

Further preferably, along short transverse, the amplitude that the distribution density of the trepanning 25 is smaller and smaller constantly increases.

By largely testing and numerical simulation can be further increased by the variation of above-mentioned trepanning distribution density 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 smaller and smaller.Further preferably, along height side To the amplitude that the area of single trepanning 25 is smaller and smaller constantly increases.Specific reason referring to 25 distribution density of trepanning variation.

Preferably, along short transverse, it is described smaller and smaller per the sum of the area of rows of openings 25.Preferably, along Short transverse, it is described to be continuously increased per the smaller and smaller amplitude of the sum of the area of rows of openings 25.Specific reason is divided referring to trepanning 25 The variation of cloth density.

Preferably, along short transverse, it is described increasing per the spacing between rows of openings 25.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 setting 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 increase heating Efficiency.By largely testing and numerical simulation can be further increased by the variation of above-mentioned electric heater for heating power 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.

By largely testing and numerical simulation can by the variation of above-mentioned 24 heating power amplitude of electrically heated rod 5% efficiency of heating surface 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 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 being arranged, 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 root diameters radially extended to electrically heated rod 22, the diameter More are arranged on electrically heated rod 22 from 22 outwardly extending triangle cooling fin 23 of radial electrically heated rod.

The present invention is by being arranged radial electrically heated rod 22 and being dissipated along 22 outwardly extending triangle of radial electrically heated rod Backing 23 can further increase the efficiency of heating surface, while increase heating surface (area) (HS, improve heating effect, and because setting triangle Shape cooling fin passes through the triangular tip of the similar acicular texture of triangle cooling fin so that the vapor bubbles of generation 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 make fluid be sufficiently mixed, 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, 0.3-0.5 times of electrically heated rod centered on the heating power of radial electrically heated rod in unit length, Preferably 0.4 times.

Preferably, the radial electrically heated rod 22 is shaft, electrical 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 length of side of triangle cooling fin 23 Or area is smaller and smaller.

Preferably, 22 both 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, the short side for forming 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 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 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 of so that being optimal of heating effect has arranged the best relationship of parameters.

The acute angle that the short side at the right angle is opposite 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 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 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 electrically heated rod 22 is set as 7-9 roots, the angle formed between adjacent radial 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 the diameter that resistance is arranged The variation of the heating power of degree.

Preferably, along short transverse, the distance between neighbouring radial electrically heated rod 22 is increasing.Into one Step is preferred, and along short transverse, the increasing amplitude of the distance between adjacent radial electrically heated rod 22 constantly increases.

Preferably, along short transverse, the heating power of the unit length of different radial electrically heated rods 22 is increasingly 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, 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 increased.By largely testing and Numerical-Mode It is quasi-, by the variation of above-mentioned electric heater for heating power, the 8-10% efficiencies of heating surface 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 subject to claim limited range.

Claims (6)

1. a kind of steam generator that upper and lower box vacuum insulation plate spacing is different, the steam generator include babinet, electricity plus Heat pipe, cold water inlet and steam (vapor) outlet, the babinet include inner and outer wall, and vacuum insulation is arranged between the inner and outer wall Plate, between vacuum heat-insulating plate, inner and outer wall space fill thermal insulation material, the babinet include upper box body, lower part box and Connect the vertical babinet of upper box body and lower part box, which is characterized in that the adjacent vacuum of upper box body and lower part box is exhausted Hot plate spacing is different, wherein the adjacent vacuum insulation for being smaller than upper box body of the adjacent vacuum heat-insulating plate of lower part box The spacing of plate；The cold water inlet is arranged on the side wall of babinet, and exhaust outlet, the electric heating tube is arranged in the babinet top It is arranged in babinet, the electric heating tube includes outer tube and the electric heater that is arranged in outer tube, and the electric heating tube is vertical Direction is arranged, and intake tunnel is arranged in the electric heating tube lower part, ensures that the water of babinet can be heated into electric heating tube, electricity The top of heating tube connects steam (vapor) outlet；Intake tunnel is trepanning, and from the bottom up along short transverse, the distribution of the trepanning is close It spends smaller and smaller.

2. steam generator as described in claim 1, which is characterized in that the spacing of the vacuum heat-insulating plate of lower part box is top 0.88-0.94 times of the vacuum insulation plate spacing of babinet.

3. steam generator as claimed in claim 2, which is characterized in that the spacing of the vacuum heat-insulating plate of lower part box is top 0.9 times of the vacuum insulation plate spacing of babinet.

4. steam generator as described in claim 1, 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.

5. steam generator as described in claim 1, which is characterized in that the cross section of the babinet is rectangular, the electricity The cross section of heating tube is round.

6. steam generator as described in claim 1, 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 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.