CN203112889U - Heating furnace - Google Patents
Heating furnace Download PDFInfo
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- CN203112889U CN203112889U CN 201320061243 CN201320061243U CN203112889U CN 203112889 U CN203112889 U CN 203112889U CN 201320061243 CN201320061243 CN 201320061243 CN 201320061243 U CN201320061243 U CN 201320061243U CN 203112889 U CN203112889 U CN 203112889U
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Abstract
The utility model provides a heating furnace which comprises a furnace cover, a furnace base plate, a heater, a fan arranged below the furnace cover, and a bearing supporting piece arranged on the furnace base plate, wherein the furnace cover is connected with the furnace base plate, so that an airtight heating cavity is formed and used for heating a bearing arranged on the bearing supporting piece; and a closed heat insulation cylinder is arranged in the middle of the furnace base plate. According to the heating furnace, the problems of poor 'synergy degree' of an air flow field and an air temperature field inside a conventional heating furnace is solved, axial height-symmetrical heating and heat exchange at a high heat transport rate are realized, and the requirement that radial swelling rates of heating surfaces of an inner ring and an outer ring of a large-mass and large-dimension bearing component along an axial height tend to be consistent is guaranteed.
Description
Technical field
The utility model relates to a kind of heating installation, relates in particular to a kind of process furnace for the heating bearing.
Background technology
It is the common method that realizes the installation between bearing and the axle that hot jacket is installed, and mainly contains medium heating and two kinds of type of heating of electrically heated.In the hot jacket installation process, make bearing add thermal expansion earlier, the swell increment of bearing inner race internal diameter is greater than after the shrink range, and bearing can be assembled on the axle.Bearing for large components such as aerogenerators often adopts " oil bath " mode, electromagnetic induction heater, warm air as the heat-transfer medium type of heating at present.
" oil bath " method of bearing heating namely belongs to the medium heating.Before the installation, bearing is put into the mineral oil sump, Heating temperature is 80 ℃～100 ℃, can determine according to material, quality, the characteristic dimension of bearing heat-up time.But, making in this way, bearing is contaminated easily, has fire hazard.These consider also need consider environment the item except health and safety, and to the oil handling problem, expense is all very high.For new bearing, bearing oil bath meeting damages the effect of protection oil.Therefore, join use " oil bath " method of no longer recommending for the big scale of Large-scale Wind Turbines, big quality bearing hot charging.
Induction heating belongs to electrical heating method, has the characteristics of high-quality rapid heating.For the bearing of different size, need to be equipped with the yoke of different size, bearing maximum heating temperature is 100 ℃～120 ℃, need to guarantee to be heated bearing with spool between the temperature difference at 80 ℃～90 ℃, must carry out demagnetization to bearing, still, there is the thoroughly difficulty of demagnetization of the degree of depth in this kind heating means.And, because to big scale, big quality bearing, when using the induction heater heating, also there is the surface action phenomenon, maximum current density appears at the top layer of bearing, temperature distributing disproportionation on the cross section is even, and " penetration of current layer " following bearing materials only can obtain heat with heat conducting mode transferring heat energy from zone of heating.On the other hand, when using induction heater to cause bearing surface " heat production " easily, bearing also constantly dispels the heat to installation environment by the surface.Therefore, the samming weak effect of bearing " eddy current heat production " own, the bearing section temperature is difficult to homogenization.Be difficult to make the bearing samming except above-mentioned, also have proximity effect.To big quality, when the big scale bearing carries out induction heating, inductor block and bearing must arranged concentric.Because symmetrical placement, distribution of current could be symmetrically and evenly in the bearing.But, if there is not the frock of symmetrical placement, only place with suit personnel visual sense feeling, then be difficult to accomplish arranged concentric, therefore can cause electric current distribution inhomogeneous, finally cause heat production inhomogeneous, thermal expansion is inhomogeneous naturally.In addition, for induction heating device more than tens kilowatts, the expense of the power electronics induction heating power of required manufacturing is more than 2-3 times of air dielectric heat transfer process furnace expense.
Resistance furnace heating is that the warm air that circulates is as a kind of heating unit of heat-transfer medium, when air-flow is surperficial by electrical heating element, in the convective heat exchange mode heat is taken away, with convection type heat is passed to bearing again, employing be to be major-minor complex method with radiative transfer as heat-transfer medium to the bearing surface transmission of heat by convection with warm air.In order to reduce the temperature difference of airflow inlet end and exit end, and rationally arrange electrical heating element equably, adopt the stove of rounded section comparatively favourable.
Fig. 1 shows the schematic cross-section of traditional process furnace.As shown in Figure 1, heating furnace body is divided into 3 two portions at the bottom of bell 1 and the stove basin.Heating furnace body is welded by shaped steel and steel plate, and furnace lining 8 uses the aluminum silicate fiber rock wool to be filled between inner bag and the protective case by the method for tiling and lay-up, is used for adiabatic heat-insulation.Bell 1 top center position arranges stove with motor 2, can adopt flange to fix.Stove drives centrifugal blower 4 as the power of air flowing with motor 2.Centrifugal blower 4 belows are provided with baffle upper plate 11, and baffle upper plate 11 comprises the vertical part of circular horizontal component and annular, are suspended in the downside of process furnace bell 1 by flow deflector pull bar 14.Form the loam cake spoke circulation road part of air flow channel between the horizontal component of baffle upper plate 11 and bell 1 inwall.3 interior vertical parts with baffle upper plate 11 are coaxially arranged with the chin spoiler 7 of annular at the bottom of the stove basin, baffle upper plate 11 and chin spoiler 7 form in inside at bell 1 and furnace bottom 3 and seam back and dock, thereby form annular air-flow path between the vertical part of baffle upper plate 11 and chin spoiler 7 and stove inwall.The furnace bottom 3 inner channel-section steels that adopt are made underframe 12 steady bearings 5, and are used for wind-guiding, to strengthen temperature uniformity.Leave contour gap at chin spoiler 7 and furnace bottom 3 inwalls, be heated bearing region (see Fig. 1 arrow shown in) for flowing into from the furnace bottom gap through annular gap from the air-flow of loam cake.Air-flow washes away along the lower surface of bearing 5, and horizontal race ring parts, the bearing upper surface of plunderring is to being flowed to the air suction inlet of centrifugal blower 4 after the parts of bearings surface heat release.Usually the electrical heating element 6 that in loam cake spoke circulation road some amount is set is as the heater heats fluidizing air, and electrical heating element 6 evenly distributes along circumference.Be heated large size bearing parts 5 and 3 supporting with the coaxial multiple spot faces that equidistantly are placed on of ring diversion plate 7 at the bottom of the stove basin, particularly, by the lower surface that is arranged at the bottom of the stove basin channel-section steel current-sharing strut member 12 steady bearings 5 in 3.
Heat-processed utilizes sensor 9 to measure the hull-skin temperature of bearing 5, and sensor 10 is measured air themperature, thereby recirculated hot air temperature, parts of bearings surface temperature are carried out real-time follow-up, and subregion control is adopted in the work of well heater electrical heating element.
The horizontal bearing convective heat exchange of plunderring of warm air, surface heat transmission criterion equation: Nu=CRe
nPr
0.33, " Nu " is the Nu-number of convective heat exchange, and " Re " is the Reynolds number of fluid, and " Pr " is the Prandtl number of fluid.Coefficient C and constant n in the noncircular cross section cylinder empirical correlation formula are listed as follows:
| Re | C | n |
| 5x10 3-1.95x10 4 | 0.16 | 0.638 |
| 1.95x10 4-10 5 | 0.0385 | 0.782 |
Just can heat bearing to process furnace according to these relational expressions and carry out heat analysis and thermal design.From the angle of each parameter field, the performance of convective heat exchange not only depends on speed and the rerum natura of fluid (warm air), and the temperature difference of fluid and solid (parts of bearings) wall, but also depends on the collaborative degree between fluid velocity field and fluid thermal flow field.Under identical speed and temperature boundary condition, their collaborative degree better, then heat transfer intensity is just high.
Yet when the process furnace that adopts Fig. 1 heated large size bearing, warm air passed through between furnace bottom and ring diversion plate, though also have artificial air channel, " being horizontal plunderring " parts of bearings on the forced-convection heat transfer mode.In stove under the ordering about of centrifugal blower 4, air-flow is whole extensive flowing in whole space, therefore lack specific aim, directivity and axial symmetry during airflow scouring parts of bearings contact surface, rotational symmetry is not accomplished in the outer ring, inner ring heating surface that causes parts of bearings height radial swelling speed vertically, does not accomplish that finishing the maximum heat that the planner is concerned about at the bearing existing structure transports speed.In addition, the relation of lumped parameter (the feature temperature difference of Tathagata flow velocity degree, fluid and wall etc.) with convection transfer rate h only discussed in the design of process furnace of the prior art, and do not consider the influence of its convection transfer rate of design h from the angle of each parameter " field ".Therefore, go to weigh from the angle of the field analysis of enhancement of heat transfer convective heat exchange problem physical mechanism, find that velocity field and the heat flow field " synergetic property " in the process furnace of the prior art is bad, a collaborative degree is poor, brings on the bearing axial height thermal stresses asymmetric.
In addition, when the process furnace that utilizes Fig. 1 heats large size bearing, all the time receive heating apart from the air in the large size bearing heating surface space at a distance, this space is big, air flow quantity is big, the temperature sluggish inertia that rises is big unloading phase of causing, the cold wind that the centrifugal blower actuation temperature is lower and bearing heat exchange, and stove is extremely low with the utilization ratio of motor, the acting of centrifugal blower power consumption.This stage lost centrifugal blower is set effect should be arranged.On the other hand, because the existence of the large space of bearing inside, the air-flow that enters furnace hearth plate can be walked around the path that bearing is walked the circulating resistance minimum, namely, be inhaled into centrifugal blower from the bearing center position, the result is that the air-flow that washes away bearing is fallen by " bypass ", bearing does not obtain directly the washing away of whole warm airs of flow process high speed flow area, and heat exchange efficiency reduces.
Various problems such as therefore, process furnace of the prior art exists to the heating of the big quality bearing of big scale that a collaborative degree is poor, bearing temperature rise is slow, and non-homogeneous expansion, heat exchange efficiency are low.
The utility model content
The purpose of this utility model is to solve at least a part of technical problem of the prior art.
One side of the present utility model is, a kind of process furnace is provided, in this process furnace, the structure stream splitter, make outer ring, inner ring, upper surface, the lower surface of parts of bearings all be subjected to the winding-up heating of hot gas flow, thereby make the quick homogenization of parts of bearings end face temperature.
Of the present utility modelly be on the other hand, a kind of process furnace is provided, in this process furnace, be provided with high efficient heat exchanging insulating energy-saving chamber, solidify sealing centrifugal blower below, bearing inner race with inner compartment, limited the air flowing away from the bearing heating surface, thereby restriction has been contained in the unnecessary space of bearing surface heat exchange, the heat transfer space that the streamlined solid that structure is heated with parts of bearings surface symmetry surrounds.
According to a side of the present utility model, a kind of process furnace is provided, described process furnace comprises bell, furnace hearth plate, well heater, be arranged on the blower fan of bell below and be arranged on bearing supports on the furnace hearth plate, bell and furnace hearth plate engage the back and form airtight heating chamber and be arranged on bearing on the bearing supports with heating, described process furnace also comprises flow deflector, described flow deflector comprises horizontal flow deflector and the ring diversion plate that extends straight down from horizontal flow deflector periphery, form the annular flow passage between ring diversion plate and the heating chamber inwall, the ring diversion plate inboard is provided with first splitter, described first splitter comprises the horizontal gas flow passage, a part that enters the total air flow in the annular flow passage is entered in the described horizontal gas flow passage by shunting, winding-up bearing outer ring surface.
Described horizontal gas flow passage can be the multilayer horizontal gas flow passage that is formed by multi-ply wood, wherein at least one horizontal gas flow passage dwindles gradually and has a convergent jet pipe effect along radially inner direction channel cross-sectional area, and the air-flow by described at least one horizontal gas flow passage forms jet at the bearing outer ring place.
The top layer plate of described horizontal gas flow passage may extend into the top of bearing outer ring, below each laminate from top to bottom and the gap between the bearing outer ring surface narrow down gradually, and satisfy the requirement of fluid continuity principle.
Described horizontal gas flow passage radial outer end is provided with first guiding device, enters in the horizontal gas flow passage with guiding gas.
Below first splitter, be provided with first sealed structure, first sealed structure contacts with the first splitter lower end and the sealing of bearing outer ring lower end, and and furnace hearth plate between form predetermined gap, the air-flow of flowing through behind the annular flow passage enters furnace hearth plate by this predetermined gap, wherein a part of air-flow enters in the space of bearing lower surface, and passes the bolt hole of bearing outer ring under the ejector action of described jet.
Described first sealed structure comprises the ring-type panel that flexibly is supported on the furnace hearth plate and is arranged on elastic sealing ring on the ring-type panel.
Described bearing inner race lower edge can be provided with second sealed structure, and the radial outside of second sealed structure can be provided with second guiding device, enters bolt hole with directing air flow.
Described bearing inboard can be provided with second splitter, and second splitter can comprise at least one level winding-up passage, after the remaining whole air-flows that enter furnace hearth plate can enter level winding-up passage from radially inner side, and winding-up bearing inner race surface.
The described second splitter inlet place can be provided with compensating heater.
Described level winding-up passage can be a plurality of, and the radial outer end of level winding-up passage and the gap between the bearing inner race surface from top to bottom diminish gradually, satisfy principle of continuity requirement.
The radial inner end of described level winding-up passage can be provided with the 3rd guiding device, and directing air flow enters described level winding-up passage in the mode of centrifugal motion.
Described second guiding device can be a plurality of water conservancy diversion arcs, and described a plurality of water conservancy diversion arcs are followed concentric(al) circles, the unequal shunting principle of arc length spacing.
Described second guiding device can be a plurality of water conservancy diversion arcs, the cross section of outermost water conservancy diversion arc can be semicircle in a plurality of water conservancy diversion arcs in described second guiding device, the upper end in the cross section of described semicircular water conservancy diversion arc connects the top of the superiors' level winding-up passage, and the lower end connects furnace hearth plate.
The middle part of described furnace hearth plate can be provided with the adiabatic cylinder of sealing.The adiabatic cylinder of described sealing can be the adiabatic cavity of sealing.The outside surface of the adiabatic cylinder of described sealing can be fairing ace.
According to another aspect of the present utility model, a kind of process furnace is provided, described process furnace comprises bell, furnace hearth plate, well heater, be arranged on the blower fan of bell below and be arranged on bearing supports on the furnace hearth plate, bell and furnace hearth plate engage the back and form airtight heating chamber and be arranged on bearing on the bearing supports with heating, it is characterized in that the middle part of described furnace hearth plate is provided with the adiabatic cylinder of sealing.
The outside surface of the adiabatic cylinder of described sealing can and be heated between the inner peripheral surface of bearing and keeps predetermined gap.The outside surface of the adiabatic cylinder of described sealing can be provided with the arc flow-guiding surface.The adiabatic cylinder of described sealing can be cylindrical cavity or Polygons column cavity.
The inboard of described bearing inner race can be provided with director, and described director will guide to the bearing inner race surface along the air-flow that the arc flow-guiding surface is moved.
In according to process furnace of the present utility model, created " a collaborative heat transfer space symmetry winding-up runner ", solved the poor problem of air flow field and air themperature field " collaborative degree " in traditional process furnace, realized that the axial height symmetry is heated, transports the speed heat exchange with high calorie, guaranteed the requirement that reaches unanimity of height radial swelling speed vertically of big quality, big scale parts of bearings inner ring, outer ring heating surface.
Description of drawings
By below in conjunction with the detailed description of accompanying drawing to exemplary embodiment, above-mentioned and other purposes of the present utility model and characteristics will become apparent, wherein:
Fig. 1 is the sectional view of process furnace of the prior art;
Fig. 2 is the sectional view according to the process furnace of the utility model exemplary embodiment.
Embodiment
The purpose of this utility model be to solve big quality, big scale (diameter, wall thickness) parts of bearings (bearing inner race, outer ring, retainer, rolling body) based on the enhancement of heat transfer problem of warm air as heat-transfer medium.So-called enhancement of heat transfer technology is the technology that increases convective heat-transfer coefficient.The enhancement of heat transfer technology can be set about or fluid side is set about from the solid side, can start with from the surface tissue/shape that changes solid, also can change the kinestate of fluid or suffered external force field and start with.Be the large size bearing surface based on being subjected to heat target, the utility model is selected to set about and carry out enhancement of heat transfer by characteristics such as bearing symmetrical structure and bolts hole from the fluid thermal air side.
Based on the mentality of designing of above-mentioned enhancement of heat transfer, the utility model provides a kind of process furnace that can the enhancement of heat transfer effect, to solve at least a portion technical problem of the prior art.
Fig. 2 shows the sectional view according to the process furnace of the utility model preferred implementation.In process furnace shown in Figure 2, being heated object is bearing 16, and this bearing 16 has " T " font bearing cross section, and the axial circumference of bearing outer ring is provided with the through hole (bolt hole) of equally spaced quite a lot of quantity.
As shown in Figure 2, described process furnace comprises bell 1, furnace hearth plate 2, and bell 1 and furnace hearth plate 2 dock the airtight heating space that the back forms general cylindrical up and down.Bell 1 and furnace hearth plate 2 include the bottom parts of sub-circular and the sidewall sections that vertically extends from the base plate periphery.Enter furnace hearth plate for the ease of operator and carry out operation, can make the upright side walls of furnace hearth plate 2 have lower height, operator need not lift the leg leap and can enter in the furnace hearth plate 2.In addition, process furnace of the present utility model and the design of traditional heating stove are gone up different, and the heating flue uses stainless steel, has significantly reduced impurity in the stove, and the impurity that causes that comes off that has reduced zone of oxidation under other heating surface high temperature enters bearing.
Stove is installed in the middle part of bell 1 with motor 4, and centrifugal blower 3 is arranged on stove with the below of motor 4, drives centrifugal blowers 3 by stove with motor 4, thereby orders about air flowing.
A plurality of well heaters 14 are evenly arranged in the downside of bell 1 along the circumferential direction of bell 1.Well heater 14 can be selected the electrothermal tube of stainless steel for use, but stainless steel electrothermal tube hot jacket stainless steel helical fin, as the means of extended surface enhancement of heat transfer.But fin surface perforate own presents corrugated, plays the growth in blocking-up fin surface hot gas flow frictional belt, the effect of attenuate boundary layer thickness; The helical corrugation fin has the effect by " centrifugal force " enhancement of heat transfer; Simultaneously, the chatter of helical corrugation fin in air-flow can produce disturbance, thus the attenuate frictional belt.Spiral fin relies on the electrothermal tube body construction, and electrothermal tube is arranged vertical with air flow line in stove, realizes the higher enhancement of heat transfer effect of the collaborative degree in field between airflow and the electrothermal tube.Alternatively, aspect the selecting for use of well heater, the electrothermal tube fin also can only be spiral type corrugated type, does not have perforate.The fixing position of well heater also not the reheating furnace inner bag lead the arc place, also can be fixed on the horizontal flow deflector in the heating furnace cover, perhaps be fixed in the vertical annular flow passage of heating furnace cover.
Be provided with splitter fluidic device 15 in the inboard of ring-type flow deflector 18, to go out a part from the airflow diversion that air-flow spoke circulation road 17 enters annular flow passage 24, in splitter fluidic device 15, be ejected on the surface, outer ring of bearing 16 along radially inner direction.Splitter fluidic device 15 comprises the horizonally projected jet passage that is formed by multi-ply wood, described multilayer fluidic channel can be the variable cross-section tapered channels, path clearance dwindles gradually along radially inner direction, effect with convergent jet pipe, thereby the exit at the variable cross-section passage forms jet, just as an ejector.Simultaneously, under the suction function of the air suction inlet of centrifugal blower 3, the exit of splitter fluidic device 15 obtains high velocity air, high velocity air winding-up bearing outer ring surface, and the bearing upper surface of flowing through then enters the air suction inlet of centrifugal blower 3.In described a plurality of horizonally projected jet passages, will all not be designed to the variable cross-section tapered channels by all horizonally projected jet passages, be the variable cross-section tapered channels as long as a passage is arranged, have convergent jet pipe effect and get final product, other passages can be straight horizontal run.Because the suction function of described at least one convergent variable cross-section passage, at gas channel exit air-flow velocity height and local pressure reduces, thereby the air-flow that drives other runners accelerates to flow out.In the exemplary embodiment, the superiors' passage in the described multilayer horizonally projected jet passage can be the convergent nozzle passage, and the runner of lower floor is straight runner.
In order to guide air-flow into centrifugal blower better, rather than vertically blow to horizontal flow deflector, top layer plate in the multi-ply wood reaches the bearing outer ring top, so that near the bearing outer ring screw, form negative pressure, thereby the air-flow that drives in the bearing outer ring screw flows out, and this will elaborate below.Following each laminate medial extremity (being the exit of horizonally projected jet passage) of top layer plate and the annular gap between the bearing outer ring surface diminish from the top down gradually, and the rule that makes the annular area in the gap that forms between horizonally projected jet passage and the bearing outer ring surface increase gradually from the bottom to top satisfies principle of continuity requirement.Like this, make lower floor winding-up air-flow upwards compile according to the fluid continuity principle, avoid air-flow to collect in the bearing outer ring upper area and produce " phenomenon of being jammed ".
Alternatively, structure as the splitter fluidic device 15 of splitter and ejector is not limited to example shown in Figure 2, also can only have one or more horizontal channels, and do not have the variable cross-section tapered channels, as long as distributed hot air flow can be gone out a part, blow then and be mapped on the bearing outer ring surface, still can improve heat-transfer effect.
In order to make air-flow be entered in the horizonally projected jet passage of splitter fluidic device 15 by shunting easily, air flow inlet place in the outboard end of the outside of ring diversion plate 18, every layer of horizonally projected jet passage can be provided with water conservancy diversion arc 13, obtains the part hot gas flow to help shunting and enters in the horizonally projected jet passage.Multilayer water conservancy diversion arc 13 can be elongated gradually from top to bottom.The air-flow of shunting can be the 1/5-1/3 of general gas flow, and in the example of present embodiment, the air-flow of shunting is 1/4, and all the other 3/4 warm airs enter furnace hearth plate.Be provided with 45 ° of circular arcs in the edge of furnace hearth plate 2 corner, be convenient to hot blast and enter in the furnace hearth plate.
The basal surface of furnace hearth plate 2 is provided with a plurality of bearing supports 6, and bearing 16 is by the support of bearing supports 6 and keep predetermined distance between the basal surface of furnace hearth plate 2.On the basal surface of furnace hearth plate 2, splitter fluidic device 15 below, be provided with annular panel 11, annular panel 11 is supported by elastic support structure 25.The periphery of annular panel 11 contacts with the lower end sealing of ring-type flow deflector 18, and feasible air-flow by annular flow passage 24 all enters in the furnace hearth plate 2.For example, between annular panel 11 and ring-type flow deflector 18, can constitute sealing by elastic sealing ring 12 soft contacts.In example shown in Figure 2, annular panel 11 and elastic sealing ring 12 also can be integrative-structures, that is, be an elastic sealing ring on the whole.Described elastic sealing ring can be arranged on the furnace hearth plate, also can be wholely set with the lower end of splitter fluidic device 15.
In addition, in lower end, bearing outer ring edge, lower end, bearing inner race edge (for example is respectively arranged with containment member, elastic sealing ring 23 and elastic sealing ring 9), thereby after bearing 16 falls in the stove on the chassis strut member 6, the encirclement of the containment member by being positioned at lower end, edge, outer ring and lower end, inner ring edge forms annular heat exchange air chamber 26 at bearing lower surface downside.A part (for example, 1/4 of total air flow) that enters the air-flow in the furnace hearth plate 2 is introduced in annular heat exchange air chamber 26.For directing air flow better enters in the annular heat exchange air chamber 26, be provided with water conservancy diversion arc 27 in the whole ring week of the elastic sealing ring 9 that is positioned at the bearing inner race lower rim, water conservancy diversion arc 27 can with elastic sealing ring 9 tangent drawing.Enter hot gas flow and the bearing convective heat exchange of the annular heat exchange air chamber 26 that is positioned at the bearing lower surface, heating bearing face, retainer, rolling body etc.Then, air-flow enters heated mandrel bearing outer-ring in the bearing outer ring through hole 10, equivalent attenuate bearing outer ring thickness (that is equivalent depth).
For the convective heat exchange at place, intensified bearing lower surface, must in time the air-flow that flows into outer ring through hole 10 be drawn up.In process furnace shown in Figure 2, because the horizontal channel of splitter fluidic device 15 has high speed variable cross-section passage, therefore formed injector.In order to utilize the ejector action of injector better, make the top layer plate of the horizonally projected jet passage of splitter fluidic device 15 reach the top of through hole 10, to drive the air-flow in the through hole 10 better.Because the injection suction function of injector, above through hole 10, form low local pressure, between bearing upper surface and lower surface, produce pressure reduction, therefore, air-flow in the bearing outer ring through hole 10 can accelerate to flow out the upper surface under the high velocity air of injector drives and under the pressure reduction promotion, with in the horizonally projected jet passage that enters splitter fluidic device 15 and the air-flow of the bearing outer ring of jetting converge, form the horizontal bearing inner race upper surface of plunderring, interflow.Therefore, air-flow not only merely relies on the pushing of air-flow at lower surface place in annular heating chamber 26 and the bearing outer ring through hole 10, but under the effect of injector, is accelerated and draws up, thereby has strengthened the convective heat exchange at place, bearing lower surface.
Entering remaining whole air-flows in the furnace hearth plate 2 (in the exemplary embodiment for total air flow 1/2) walks around elastic sealing ring 9 and enters bearing inner race.Be provided with water conservancy diversion blowing device 28 in the bearing inner race inboard, behind remaining whole airflow passes water conservancy diversion blowing devices 28, winding-up bearing inner race surface.Water conservancy diversion blowing device 28 comprises multilayer horizontal gas flow passage.Enter the horizontal gas flow passage of water conservancy diversion blowing device 28 for directing air flow, radially inner side at every layer of horizontal gas flow passage is provided with inboard water conservancy diversion arc 8, the sectional view of the water conservancy diversion arc 29 of the outmost turns in the inboard water conservancy diversion arc 8 can be " semicircle " shape, the furnace hearth plate air-flow is made circumferential motion after entering the water conservancy diversion arc, can reduce the flow path resistance loss.The water conservancy diversion runner that the water conservancy diversion arc of water conservancy diversion blowing device 28 forms and water conservancy diversion arc can be followed concentric(al) circles, the unequal shunting principle of arc length spacing, reduce gradually along the circular arc radial spacing.Therefore, the inboard water conservancy diversion arc 8 that adopts is not impartial gap.Because air-flow makes centrifugal motion in water conservancy diversion blowing device 28, therefore, air-flow can be under action of centrifugal force runout level gas channel fast, winding-up bearing inner race surface.Can in inner ring water conservancy diversion arc 29 compensating heater 7 be set, compensation is because flow velocity reduces the minimizing of the convective heat exchange efficient of bringing.
Simultaneously, the annular gap between horizontal gas flow passage and the bearing inner race from bottom to top increases gradually, and the rule that the annular area in gap increases gradually satisfies principle of continuity requirement, produces " phenomenon of being jammed " to avoid air-flow at the bearing inner race upper area.
In addition, water conservancy diversion blowing device 28 also can be similar with splitter fluidic device 15, the path clearance that is configured to a plurality of horizontal gas flow passages reduces gradually along radially outer direction, has convergent jet pipe effect, and under the suction function of the air suction inlet of centrifugal blower 3, form jet in the exit, thereby have better enhanced heat exchange effect.
Converge with outer ring air-flow, three strands of air-flows of outer ring through hole air-flow after entering the air flow blowing bearing inner race surface, release of heat of water conservancy diversion blowing device 28, together suck the blast inlet of centrifugal blower 3, form the source of confluxing in the air suction inlet of centrifugal blower.Ring-type on the bearing upper surface entad effect of injection air-flow has been adjusted being heated of upper and lower end face, thereby the asymmetric thermal stresses that causes of being heated up and down in heat-processed reduces.The reciprocation cycle of hot gas flow has realized the reciprocation cycle of air dielectric heat absorption, heat release.In this reciprocation cycle, the radial symmetry that race ring needing to have obtained expands.
According on the other hand of the present utility model, in order to realize energy-efficient design philosophy, be provided with " the energy-conservation chamber of high efficient heat exchanging " at the process furnace middle part.That is, be provided with adiabatic enclosed cavity 5 at the furnace hearth plate middle part, the inwall of cavity attaches thermal insulation material, is used for isolated cavity hot outside by air heat exchange in cavity wall and the chamber.Because energy-conservation chamber 5 has occupied bearing inner race with interior zone, restriction is contained in the space that the bearing surface heat exchange is unnecessary, these spaces are solidified into thermal insulator, and the outside surface in energy-conservation chamber 5 can be made streamlined wall, the heat transfer space that the streamlined solid wall surface that the bearing surface symmetry is heated with structure surrounds.For example, water conservancy diversion arc 29 can be that outside surface by energy-conservation chamber 5 forms.In other words, the cross-sectional shape in energy-conservation chamber is arc.Alternatively, the form in energy-conservation chamber is not limited to cylindrical cavity, also can be Polygons column cavity, can certainly be the solid cylinder structure of filling up thermal insulation material.
Because the existence in energy-conservation chamber 5, high velocity air can not taken a shortcut by short circuit in process furnace as shown in Figure 1 like that, but shown in the arrow among Fig. 2, and bearing is jetted enters the next round circulation after the heat exchange.In addition because the existence in energy-conservation chamber 5, arteface the finite space of convective heat exchange, make bearing obtain directly the washing away of whole hot gas flows of flow field high speed flow area.Simultaneously, flow velocity increases, and Reynolds number increases, Nu-number increases, and makes convection transfer rate increase.In addition, owing to reducing of fluid heat transfer space, the volume number reduces, and the rated flow of blower fan reduces, and makes power of motor reduce, thereby reaches purpose of energy saving.
Comprehensive above-mentioned many aspects have following beneficial effect according to the process furnace of the utility model preferred embodiment:
Aspect enhancement of heat transfer, a raising collaborative degree, process furnace according to exemplary embodiment of the present utility model is guidance with the field synergistic principle, jetting by heating unit with jet injection warm air is measure, by the air-flow of bearing outer ring axis hole for afterflow passage acceleration bearing lower surface, the transmission of heat by convection passage is worked in coordination with in the arteface field.This design has taken full advantage of three usefulness of bearing outer ring axis hole: first is to draw auxiliary passage as the lower surface air-flow, the process air-flow of " drawing " simultaneously at the passage internal heating outer ring bore surface, equivalent attenuate outer ring thickness (thermal design feature); Second effect is to provide a passage to bearing lower surface air-flow " recovery ", the speed of accelerated passage air-flow, and enhanced heat exchange outer ring axis hole arranges the injection air-flow above the axis hole of outer ring; The 3rd effect is that derivative hot gas flow continues the horizontal bearing upper surface of plunderring, and heated the bearing upper surface.
Whole bearing lower surface obtains 1/4th air-flows of heat, and the upper surface obtains 1/2nd air-flows of total flux.Other 1/4th hot gas flow heats bearing inner race pass through bearing inner race injector winding-up bearing inner race surface by compensating heater heating back.This type of heating is given needs the big scale that expands, big quality bearing to create " a collaborative degree " higher convective heat exchange field, not only improved surface film thermal conductance, played the effect of enhancement of heat transfer, and make bearing inner race, outer ring, upper surface and lower surface all be subjected to washing away of hot gas flow, be heated as far as possible equably, make the parts of bearings heating surface vertically height radial swelling speed reach unanimity.Therefore, solved that the planner is concerned about to big scale, unequal, the asymmetric problem of being heated of big quality bearing heating expansion heating surface.
Aspect energy-efficient, the utility model is by arranging a cylindricality enclosed cavity in furnace hearth plate central authorities, and most of spaces in the process furnace that accounts for are with the adiabatic curing of space sealing that the unwanted negative pressure of heat exchange is confluxed.As the special construction that obtains high velocity air, the ingenious redundant space that accounts for of insulation chambers makes air-flow flow in the artificial finite space of making, and has obtained the high reynolds number of bearing heat-transfer surface regional gas stream.Non-flow channel space air-flow in the insulation chambers does not participate in centrifugal blower fan blade wheel and drives, does not participate in heat absorption, do not participate in heat exchange.After insulation chambers is set, there is not the air-flow that is detained the dead angle outside the gas channel, avoided the part air-flow in heat absorption, also to participate in being driven wasted work by centrifugal blower fan blade wheel, do not have unnecessary interference in air flow main flow yet.Therefore, the utility model has improved rate of heat transfer by insulation chambers is set, and has solved that bearing process furnace space before this is big, flow velocity is low, Reynolds number is low, can't obtain the problem obstacle of high reynolds number and high surface coefficient of heat transfer.
Because process furnace of the present utility model is with the foundation of " field is collaborative " principle as the reinforcement convective heat exchange, the heat exchange rate of air and electrical heating element is improved in the centrifugal blower air channel, and process furnace starts the back air themperature and doubles than device airflow temperature rise rate shown in Figure 1.Simultaneously, stable " temperature rise " under the rated output of electrothermal tube own obtained effective control (having descended 15%), protected electrical heating element (it is overheated to prevent).
At the well heater work initial stage, full power drops into, be equal in the time, the temperature rate-of-rise on bearing enclose surface is improved, (time of the described process furnace of Fig. 1 65%) bearing surface temperature reaches predetermined temperature value in the short relatively time, thereby finish " informal situation stage " ahead of time, enter " regular thermal conditions stage ".Subsequently, control electrical heating element work according to permanent wall temperature mode, the electrical heating element watt consumption is minimum.Actual device is used and is confirmed: owing to equipment, element heat accumulation in the process furnace, cause no longer power consumption work of electrical heating element.Therefore, the minimum swell increment of bearing convective heat exchange that determines according to permanent wall temperature mode final condition time of needing is by " control indirectly ".
Therefore, according to process furnace of the present utility model have that collaborative degree is high, heat exchange efficiency is high, be heated evenly, many-sided beneficial effect such as energy-efficient.
Though with reference to preferred implementation design of the present utility model is described above, but, in practice, do not require the feature of the each side that possesses the process furnace in above-described embodiment simultaneously, but the characteristics on the one hand of can using for reference are wherein improved heats.For example, the insulating energy-saving chamber redundant space that accounts for can only be set at the middle part of traditional heating stove, avoid the hot gas flow short circuit.For example, bearing outer ring splitter fluidic device can only be set, also can bearing inner race only be set and divide flow jet device, also above-mentioned many aspects can be chosen combination arbitrarily.In addition, above-mentioned splitter fluidic device also can only possess the shunting function and not possess jet function, still can obtain the effect of enhancement of heat transfer, temperature homogenization.
In addition, technical conceive of the present utility model is not limited only to the heating large bearing, and heat etc. inner ring heating or the outer ring that also can be used for the various central portions of heating or central portion.
In the exemplary embodiment, though the heated object bearing is ring-type, process furnace also is designed conglobate, but, when the hollow body of the non-toroidal of heating, the shape of process furnace can change along with the shape of heated object, so long as adopted design concepts such as the separator fluidic device in the exemplary embodiment, axis hole airflow injection, insulation chambers all to belong to replacement or the modification of being equal to of the present utility model.Therefore, specified shapes such as the annular of mentioning in the claims only are for convenience of description, and unintentionally process furnace and heated object are defined as specified shape.
Though described the utility model with reference to preferred embodiment, it should be appreciated by those skilled in the art, under the situation that does not break away from spirit of the present utility model and principle, can make various changes and modification.These change and modification all falls within the protection domain of the present utility model.
Claims (5)
1. process furnace, comprise bell, furnace hearth plate, well heater, be arranged on the blower fan of bell below and be arranged on bearing supports on the furnace hearth plate, bell and furnace hearth plate engage the back and form airtight heating chamber and be arranged on bearing on the bearing supports with heating, it is characterized in that the middle part of described furnace hearth plate is provided with the adiabatic cylinder of sealing.
2. process furnace as claimed in claim 1 is characterized in that, the outside surface of the adiabatic cylinder of described sealing and be heated between the inner peripheral surface of bearing and keep predetermined gap.
3. process furnace as claimed in claim 2 is characterized in that, the outside surface of the adiabatic cylinder of described sealing is provided with the arc flow-guiding surface.
4. as the described process furnace of each claim among the claim 1-3, it is characterized in that the adiabatic cylinder of described sealing is cylindrical cavity or Polygons column cavity.
5. process furnace as claimed in claim 3 is characterized in that, the inboard of described bearing inner race is provided with director, and described director will guide to the bearing inner race surface along the air-flow that the arc flow-guiding surface is moved.
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| CN 201320061243 CN203112889U (en) | 2012-12-31 | 2013-02-01 | Heating furnace |
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| CN201210592883 | 2012-12-31 | ||
| CN201210592883.0 | 2012-12-31 | ||
| CN 201320061243 CN203112889U (en) | 2012-12-31 | 2013-02-01 | Heating furnace |
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| CN 201320061243 Expired - Lifetime CN203112889U (en) | 2012-12-31 | 2013-02-01 | Heating furnace |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103629838A (en) * | 2013-11-10 | 2014-03-12 | 西安航天化学动力厂 | Aerodynamic heating furnace |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103725863B (en) * | 2013-12-26 | 2015-12-16 | 北京金风科创风电设备有限公司 | A kind of heating unit of annular element and annular housing thereof |
| CN104152663B (en) * | 2014-07-18 | 2015-10-21 | 新疆金风科技股份有限公司 | The process furnace of annular element |
| CN105618999B (en) * | 2016-03-13 | 2018-04-10 | 广西南宁市中高糖机设备制造有限公司 | The method that cane sugar manufacture pressure roller shell hot jacket squeezes roll shaft |
| CN107435090B (en) * | 2016-05-25 | 2019-01-01 | 新疆金风科技股份有限公司 | A kind of energy-saving vibration-damping device and heating furnace for heating furnace |
| CN107436038B (en) * | 2016-05-25 | 2019-12-13 | 新疆金风科技股份有限公司 | Heating control method and heating control system for annular part |
| CN107435095B (en) * | 2016-05-25 | 2019-01-01 | 新疆金风科技股份有限公司 | A kind of support device of heating furnace and its annular heated object |
| CN107436613B (en) * | 2016-05-25 | 2020-01-31 | 新疆金风科技股份有限公司 | Control method and control system for simultaneously heating at least more than two annular parts |
| CN106282527B (en) * | 2016-09-29 | 2018-04-13 | 北京金风科创风电设备有限公司 | A kind of heating furnace for annular element heating |
| CN106435138B (en) * | 2016-11-14 | 2018-12-14 | 广东坚美铝型材厂（集团）有限公司 | A kind of beam wind circulating-heating aging furnace and the method using beam wind heating aluminium |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| RU1788981C (en) * | 1991-03-07 | 1993-01-15 | Магнитогорский металлургический комбинат им.В.И.Ленина | Bell-type furnace |
| AT399164B (en) * | 1992-12-04 | 1995-03-27 | Ebner Ind Ofenbau | DEVICE FOR SUPPLYING PLANNER WORKPIECE SURFACES WITH A GAS, IN PARTICULAR THE FACE SURFACES OF A TAPE BAND IN A CHAMBER OVEN |
| CN2517750Y (en) * | 2002-01-14 | 2002-10-23 | 张民苏 | Heat exchanging forced cooling appts. for copper tube continuous polishing and annealing furnace |
| CN101993990A (en) * | 2010-11-29 | 2011-03-30 | 苏州中门子科技有限公司 | Strong convection structure on heat treatment furnace |
| CN102080151B (en) * | 2010-12-15 | 2012-12-05 | 中国科学院合肥物质科学研究院 | Pit type Nb3Sn coil thermal treatment furnace system under conditions of vacuum and aeration protection |
| CN201971859U (en) * | 2010-12-27 | 2011-09-14 | 苏州新长光热能科技有限公司 | Efficient air circulation flow guiding device applicable to thermal treatment furnaces |
-
2013
- 2013-02-01 CN CN201310042831.0A patent/CN103088200B/en active Active
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103629838A (en) * | 2013-11-10 | 2014-03-12 | 西安航天化学动力厂 | Aerodynamic heating furnace |
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| CN103088200B (en) | 2014-08-13 |
| CN103088200A (en) | 2013-05-08 |
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Granted publication date: 20130807 |