DE1812584A1 - Drying device - Google Patents

Description

November 30, 1968 D 1619 - real

Dr. Ing.Kurt Zenkner, - Φ

happy mood

The invention relates to a! Proüknungsvorriehtung for! Drouknen of piece goods, fiber goods, etc., which a Sebläae for conveying yoil fresh air * a combustion chamber in which hot Sase are extracted, a heat exchange in which the Frison air conveyed by the fan with that coming from the combustion chamber hot oases are brought into heat-exchanging cooperation, and contains a froekenkammer in which the heated air is brought to act on the dried material.

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1812884

The present invention is used in drying technology The often occurring task of supplying long and narrow air ducts with air and heat evenly. The previously known solutions »e.g. the use of sit several end to end on a common axis ^ - the üirommellrunners have the material part. that the speed distribution and in the same way also the temperature distribution is uneven, so that there are overheating zones show that the combustion chamber is badly pressurized and that sensitive files of the overall arrangement in the hot air flow lie, etc. The aim of the present invention is in creating a remedy here.

According to the Brfindusag, the new arrangement provides for the above-mentioned 2wecjfc, that a so-called highly stable cross-flow fan is used to convey the air. an impeller and, in association with this impeller, a guide wall and a 'vortex tongue, i.e. a cross-flow fan of the type in which the guide wall immediately moves away from the impeller circumference in the direction of flow behind the inlet and changes into a spiral shape and the angle between the Tangent at the start of the wheel and the tangent at the end of the wheel is less than 90 °, the rays from the center of the wheel to the Beruiiriiiagspiinkten of the laageatea include an angle of about 180 ° - two see ^ at which the suction side area of the

00982S / 0S3S

fceilf örmigeri and only the smallest possible area of the Vortex tongue covering the impeller circumference with the impeller circumference a gap that widens in the direction of rotation of the impeller forms with the effective surface on the pressure side the vortex tongue encloses an acute angle and in which the vortex tongue finally forms one with the impeller circumference Channel forms through which a partial flow of the conveyed air is returned from the pressure side approximately in a tangential direction to the impeller circumference to the impeller that also the The axial length of the impeller of the fan is significantly greater than, e.g. three to ten times as large as the impeller diameter is that furthermore the impeller of the fan, the combustion chamber and the heat exchanger in one low, However, wide, elongated guide channel forming housing are included, the width of which is about the length of the Fan impeller corresponds, and that finally the Storage and drive units associated with the impeller of the fan are located in the area surrounding the impeller Housing. The device according to the invention has the advantage that. now because of the special form of the Fan prevents the formation of dead water areas, which can easily lead to overheating zones, and pressure losses can be bridged. In addition, you can now build lower without having to take into account the high Druok losses that would otherwise be expected. The temperature distribution and the speed distribution is of an almost ideal uniformity, the flow conditions

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1812184

The sneeze and the heat efficiency are optimal »Also the parts of the arrangement can be accommodated in such a way that that they are well protected from hot air.

In the drawing, exemplary embodiments of the subject matter of the invention are shown. Show it

Fig. 1 a device according to the invention in a schematic representation in plan view,

■ '■ Fig. 1a the fan of the arrangement according to FIG. 1 in

perspective view from the side,

Fig. 1b shows the combustion chamber with the exhaust pipes of the heat exchanger seen in perspective from the side,

1c and 1d show two embodiments of the arrangement 1 to be used blower in a side view in a schematic representation,

Fig. 2, 3 and 4 show various examples of the allocation of the individual parts of the advantages of the present invention riuhtvng each other respectively in a side view in schematisoher representation,

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5, 6, 7 and 8 further variants of the invention on the other hand Stand also in a side view in a thematic representation,

ig. 9 an example of assembling two

Units of the device according to the invention in a plan view in a schematic representation,

10a shows a further embodiment of the object

of the invention in a side view in section and

10b shows the arrangement according to "Pig. 10a in a front view

view also in a vertical cut.

The dressing arrangement shown in FIG. 1 should be followed ^; i £ 'W "ne 1 -. to convey v -: - ^v i ΐ: -.-. ϊ ·. :: Λύΐ * ;, -Jtrt: B ^ er -: =». ;;:! ■. r 2, Ii: dr: τ hot -iase erse-w- ¹ "wera ^ r, ^ u ^ ¹ J : l ^c ·". t: » ⁰ -.)? ^ e- i-t'V i ^ mjuxüvmeT der Öl- ouer -'.'- iif:.; -.! .-. ·. ν ^% ■ ,,, _ ^ ..- r-.iu- - i ^: t lind a heat exchanger 4, in α em The fresh air ordered from the Tetiä ^ e _t > f according to the arrows o with the hot grass coming from the combustion chamber, which is then passed through the exhaust pipes 8, in ^ Srideauetauscnenden Ziisammonffekteri gsbiaoit ^ riw * a; 3: * ieb "iUa> € int als sogöitantit ^ b ho- h ^ tnnj les ·?! ϊΐ-ΐίί.: - rυ:.".? · «ϊί / ί-ν--, anBgsbllclet, es be ^ ic.?; e>n; ^ 'u't-ad -.; .- ;; .- ?: Ια

g behind a

tongue 11. Bas cross-flow impeller 9 is driven by a motor and is contained at both axial ends between closed or Tollen wall sections or end plates. The impeller circumference is assigned the Leitwand.10, which encompasses the impeller so far that the rays from the center of the impeller to the contact points of the elongated elements 11a, 11b at the start of the guide wall and the end of the guide wall enclose an angle of about 180 ° and the tangent 11a with the tangent 11b Forms an angle of less than 90 ° * In addition to the guide wall gradually changing into a spiral shape, the vortex tongue 11 is also provided, which is wedge-shaped and at a point approximately diametrically opposite the guide wall separates the pressure side from the suction side and pushes these sides apart the suction-side effective surface 12a with the impeller circumference forms a gap that widens in the direction of rotation and forms an acute angle with the pressure-side effective surface 12b? Sighting to the impeller part »This vortex tongue only covers the fclein as possible area of the impeller circumference from «In the embodiment nacö. In figc 1c, the walls of the wedge-shaped whirlwinds, designed as hollow bodies, have inlet openings with water. . _ΛΛη::;... -.- ϊΚ * ■ /> £ ai (ig - !; rittsüffm3ngei i, When Ausfiliirungaform ίϊ'-ι ^ .. Id IEFE as feitilförmige lirbelssnxigs ψοϊι open

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Channels 15 traversed. However, the arrangement can also be so be taken so that the wedge-shaped vertebral tongue dea Cross-flow fan is assigned a baffle that is with the vortex tongue forms a channel which is used to return a partial flow from the pressure side to the suction side. Such a baffle is shown at 14 in FIG. 1a. According to the invention, the arrangement is made so that the axial length of the impeller of the fan is essential is larger than the impeller diameter, e.g. it can be three to ten times that of its diameter. The impeller of the fan, the combustion chamber 2 and the heat exchanger are also in one low, however wide, elongated! guide channel forming housing included, the width of which corresponds approximately to the length of the fan impeller. The ones assigned to the impeller of the blower Storage and drive units, e.g. the bearings 16, the protruding part 17 of the burner and the protruding part Part 18 of the exhaust pipe system is located outside the housing surrounding the impeller. Also owns the device according to the invention still has a drying chamber in which the heated air to act on the material to be dried is brought.

In the embodiment according to FIG. 2, the feed section 21 leading the conveying air to the fan 20 forms of the air duct representing the air duct

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with the remaining part 22 of the channel, which is the combustion chamber 23 and the heat exchanger 24 contains an angle of about 90 ° · However, the arrangement can also according to Fig. 4 be made so that the conveying air from the entry into the device housing 25 to the point of impact the goods to be dried along a straight line without deflection Railway is guided. In this arrangement, the combustion chamber 26b is the impeller as seen in the flow direction of the fan 26a and the heat exchanger 26c are connected downstream of the combustion chamber 26d, the air guiding means the conveying air without diversion from the fan to the combustion chamber and from there to the heat exchanger. The order can however also be made according to FIG. 3 so that the the conveying air from the heat exchanger 27c to the material to be dried in the space 28 leading discharge section 29c of the air duct with the part 29b of the duct, which apart from the heat exchanger also contains the combustion chamber 27b and the fan 27a, forms an angle of approximately 90 ° and runs parallel to the feed section 29a, so that overall an arrangement results in which the feed section 29a, the discharge section 29c and the middle section 29b of the Air duct surrounding the chamber 28 containing the material to be dried on three sides and contained between them. The discharge section 29c of the air duct extends here along the space 28 which contains the material to be dried, the wall 29d of the

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Air duct is provided with nozzles 30 for the conveying air to pass through.

In general, as in Flg. 5 and b , the heat exchanger 30c or 31c is connected to a channel section 32 or 33, the wall of which facing the material to be dried has nozzles distributed over its entire length. In the arrangement according to FIG. 6, the fan 31a is preceded by the combustion chamber 31b with the heat exchanger on the one hand, and on the other hand two parallel duct sections 33a, 33b are connected downstream of the fan 31a, which contain between them the space 34 carrying the drying material and its walls 34a facing the drying material , 34b have nozzles 35 distributed over their entire length and width, the walls containing the nozzles containing a long, narrow space between them through which the material to be dried is guided by resting it on a belt, etc. So, for example, ceramic moldings can be dried, etc. In the arrangement according to FIG. 6, the two parallel duct sections 33a, 33b are preceded by an approximately triangular deflecting body 36 which introduces part of the conveying air coming from the fan into one duct section and the other part of the conveying air coming from the fan into the other duct section. In the arrangement according to FIG. 5, the fan 30a has, on the one hand, the combustion chamber 30b with the heat exchanger 30c and, on the other hand, a duct section 32

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naoftwitched, those on the one containing the Trooknungsgut Room leads along and their facing towards the drying material Wall nozzles distributed over its entire length and width 37 owns. Also in Fig.10a and 10b is a variant of the Subject of the invention shown, in which the air coming from the fan 40a of the combustion chamber 40b to the heat exchanger 40q after a deflection by 90 and then by a further 90 ° is introduced through nozzles 41 into the space containing the material to be dried contains. In particular from Fig. 10b it can be seen that the nozzles in a row arrangement in itself over the entire The nozzle inserts 4-2 extending along the length of the corresponding duct section are included in the direction of the width of the channel part lie next to each other and between which here Duruhlätze 43 are left free, through which part of the air blown onto the material to be dried, into which the nozzles can get back.

The use of the above-described highly stable Querstromgebläaes has the advantage SiCN _s that now on the one hand preventing the formation of dead water zones and on the other hand, the pressure losses can be bridged, so that one can also build low "One can now axially parallel the combustion chamber than to the impeller of the cross flow fan langpriamatisehen Form body, whose length L is much greater ZoB. three "to ten times as big

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like the Iiaufraddurohmeeser d, where "at the length of the Combustion chamber can correspond to the width of the housing forming the guide channel. That way you can get the Make optimal use of the sewer from a heat-economical point of view, one generates a low but long heat. The distance a behaves between the combustion chamber and the heat exchanger compared to the combustion chamber diameter D as 1: 4 to 1: 2, in this way it is achieved that the flow after the combustion chamber can close again. The cross-flow fan flow is very turbulent, which has the consequence that the combustion chamber surrounded by the conveying air is very can be effectively cooled. In addition, the cross-flow blower also brings the gate part with it that the his usual deflection of the air by 93 ° in many applications brings a considerable saving of space with it. To ensure the flow is as uniform as possible over the entire course you can stop at the control points for the conveying air several approximately across the width of the duct Provide evenly spaced baffles 37a, 37b, 38, 39 which are curved according to a convex curve. The pipes of the heat exchanger carrying the exhaust gases can also expediently cover a large part of their inside Length-extending turbulence elements 45 contain, as an elongated helix or as a spiral wound in itself Sheet metal are formed and are used to

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Contribute equalizing the GeschwindigkeitsYerteilung and the temperature distribution. "One can auuh between the side wall of Torrichtungsgehäuses or air guide channel and the facing axial end of the heat exchanger Stralilungsschutsblech switch _$ as Z ,, is shown in phantom at 46 in Fig. 1 ₀ B? The spaced to the housing or duct wall and to the heat exchanger and is flushed and cooled on both sides τοη of the conveying air.

In particular from Fig. 7? 8 and 9, another important feature of the invention can be seen. The arrangement can namely be made so that the fan, the combustion chamber and the heat exchanger are contained in the one inlet for the hairdressing air and one outlet for the hot air air duct, which with suitable housing walls forms an independent and self-contained unit, said me'hrere such units in the longitudinal direction and / or in the width direction are assemble _β such a unit Z is shown as ₀ in FIG 7 _0, here are the fan 47a and the combustion chamber 47b to the heat exchangers 47c = in a housing 48 containing ^ from which the heated air passes through the nozzles 49 onto the conveyor belt 50, the drying material ₉ is on the. These housings can, for example, turn in the longitudinal direction according to arrow 51 "in FIG." 8 is an arrangement similar to sin®

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shown, here the fan 52a with the combustion chamber 52b and the heat exchanger 52c is contained in the housing 53, whereby it forms a self-contained, independent unit with this housing. Within such a self-contained, independent unit, at least the drive of the blower, the burner and the heat exchanger bore carrying the exhaust gases are accessible from the outside and expediently from the same side. In Pig. 9 shows an embodiment in which the housing 55 of the unit has on one side a narrow, elongated compartment 5b, which strives over the entire length of the unit and in which the drive 57 for the U-blower if. 8, the a ^ s i. sv combustion chamber 59 steheiiüe part of Brummers 60 vrnd α · ^r of iv.szen ^ he zv glxci-ie Till M aer iibg ^^ r ^ ar ^ t ^ Ue ° - W; lrrK: ■■■■ ^... it ^; iii ^

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are offset. This results in a particularly advantageous one space-saving construction »

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Claims (22)

Expectations 1. Drying device for drying piece goods, Fiber material, etc., which have a fan for conveying fresh air, a combustion chamber in which hot gases are generated, a Heat exchanger in which the fresh air conveyed by the fan is mixed with the hot gases coming from the combustion chamber heat-exchanging interaction are brought, and a drying chamber in which the heated air to act is brought to the material to be dried, contains, characterized in that a so-called for conveying the air Highly stable cross-flow fan with an impeller and, in association with this impeller, a guide wall and a vortex tongue, So a cross-flow fan is provided of the type in which the baffle is in Strömtmgsriohtung behind the Inlet immediately removed from the circumference of the impeller in a bulbous shape and merges into a spiral shape and the angle between the tangent at the start of the stator and the tangent at the end of the stator is less than 90 °, with the rays coming from the center of the impeller enclose an angle of about 180 ° between them to the points of contact of the tangents, and at the furthermore the effective surface of the wedge-shaped surface on the suction side and only cover the smallest possible area of the impeller circumference. - 16 009825/0936 covering vortex tongue forms with the impeller circumference a gap that widens in the direction of rotation of the impeller and with the pressure-side effective surface of the vertebral tongue encloses an acute angle and with which finally the vortex tongue forms a channel with the impeller circumference, through which a partial flow of the conveyed air from the pressure side is returned approximately in the tangential direction to the impeller circumference to the impeller that also the axial The length of the impeller of the blower is significantly greater than, e.g. 3 to 10 times as large as the impeller diameter, that still the impeller of the fan, the combustion chamber and the heat exchanger in one low, however wide, elongated guide channel forming housing are included, the width of which is approximately the length of the fan impeller corresponds, and that finally the storage and drive units assigned to the impeller of the fan are located outside of the housing surrounding the impeller. 2. Drying device according to claim 1, characterized in that that, seen in the direction of flow of the conveying air, the combustion chamber, the impeller of the fan and the heat exchanger downstream of the combustion chamber, where expediently: \ gerweise the air guiding means without deflection from the fan to the combustion chamber and from this to the heat exchanger to lead. - 17 - 0098 2 5/0936 3 · Drying device according to claim 1 or 2, characterized characterized in that the conveying air from the entry into the device housing until it hits the material to be dried is guided along a straight path without deflection. 4. Drying device according to claim 1 or 2, characterized in that the conveying air leading to the fan Feed section of the air guiding means representing Air duct forms an angle of about 90 ° with the rest of the duct. 5. Drying device according to claim 4, characterized in that that the feed section of the air duct is the fan and / or the combustion chamber and / or the heat exchanger contains. 6. Drying device according to claim 1 or 2, characterized in that the conveying air from the heat exchanger Discharge fiartie of the air duct leading to the material to be dried forms an angle of about 90 ° with the rest of the channel. 7. drying device according to one of claims 4 to 6, gekennzeiuhnet that the discharge section and the feed section run approximately parallel to each other. - 18 009825/0936 8. Trouknungsvorrichtung according to any one of claims 5 to 7, characterized in that the discharge section of the air duct is located on one containing the material to be dried Space extends along and the wall of the air duct facing the material to be dried with nozzles for passing through the conveying air is provided. 9. Drying device according to one of claims 4 to 8, characterized in that the feed section, the discharge section and a conveyor fan, the combustion chamber and the The middle part of the air duct containing the heat exchanger is the chamber containing the material to be dried three sides surrounded and contained between them. 10. Drying device according to one of claims 1 to 3, characterized in that the heat exchanger is followed by a duct section, the section of which faces the material to be dried Wall has nozzles distributed over its entire length. 11. Trouknungsvorrichtung according to claim 1, characterized in that the fan on the one hand with the combustion chamber upstream of the heat exchanger and on the other hand, two parallel duct sections are connected downstream, which contain the space leading to the drying material between them and their walls facing the material to be dried over their -19- 009825/093 6 Have nozzles distributed over the entire length and width. 12. Drying device according to claim 11, characterized in that that the walls containing the nozzles contain an elongated narrow space between them which the trouknungsgut is passed through. 15 drying device according to claim 11 or 12, characterized in that the two mutually parallel duct sections are preceded by a, for example, triangular deflection body, which feeds part of the conveying air coming from the blower into one section of the duct and the other part of the conveying air coming from the blower into the other section of the duct. 14. Drying device according to claim 1, characterized in that that the fan on the one hand the combustion chamber with the heat exchanger and on the other hand a duct section connected downstream which leads along the space containing the material to be dried and which faces the material to be dried Wall nozzles distributed over its entire length and width, 15 · drying device according to one of claims 10 to 14 »characterized in that the nozzles are arranged in rows over the entire length of the corresponding Nozzle inserts extending through the duct section are included, - 20 - 009825/0936 which lie next to one another in the direction of the width of the duct section and leave passages between them are through which part of the on the Trouknungsgut inflated air can get back into the duct section containing the nozzles. 16. Drying device according to one of claims 1 to 15, characterized in that the combustion chamber than with the Impeller of the cross-flow fan is formed axially parallel long prismatic body, the length of which is much greater as, e.g. i3. 5 to 10 times as large as the impeller diameter. 17. Drying device according to claim 16, characterized in that that the length of the combustion chamber corresponds to the width of the housing forming the guide channel. 18. Drying device according to one of claims 15 to 17, characterized in that the distance between the Combustion chamber and the heat exchanger behave in relation to the combustion chamber diameter as .1: 4 to 1s2. 19. Drying device according to one of claims 1 to 13, characterized in that at the TTmlenkstellen for the conveying air approximately several over the channel side Evenly spaced Leitbleohe provided - 21 - 009825/0936 which are curved according to a convex curve. 20 · Drying device according to one of the claims 1 to 19 »characterized in that between the side wall of the Yorrichtungsgehäuses or air duct and the facing axial end of the heat exchanger Radiation protection sheet is switched, which is at a distance from the housing or duct wall and the heat exchanger and is flushed and cooled by the conveying air on both sides. "■ 21 · drying device according to one of claims 1 to 20, characterized in that the leading the exhaust gases Drill a turbulence element expediently over a large part of its length in the heat exchanger which are designed as an elongated helix or as an apiral-shaped twisted sheet metal 22. Trotfknungsvorrielitung according to one of claims 1 to 21, characterized in that the fan, the combustion chamber and the heat exchanger in dea an inlet for the fresh air and an outlet for the hot air air duct are included, which is an independent and self-contained unit with suitable Urehäusewwall forms, with several egg units in the longitudinal direction and / or can be assembled in the width direction. - 22 - 009825/0936 23 drying device according to spoke 22, characterized in that that within the self-contained, / independent unit at least the drive of the fan, the burner and the heat exchanger bore leading the exhaust gases from the outside and in this case from the outside are accessible from the same side. 24 · Drying device according to claim 23 »characterized in that that the housing of the unit on one side extends over the entire length of the unit Has niche-like elongated compartment mag, in which is the drive of the fan, which is the combustion chamber protruding part of the burner, the one accessible from arasseii Part of the exhaust pipes etc. are housed 25- drying apparatus of claim 24 _w characterized in that the housings of two in Judr & ung the width juxtaposed assembled! Each anhexten one the drives, the above burner parts and from the outside accessible exhaust pipe portions having both units receiving common niche-like section, said joint Hisehe associated Units are offset from each other both with reference to the length of the longitudinal axis and to the direction of the width of the area © each offset by 180 ° 009825/0936