EP0421182A2 - Air mixing device - Google Patents

Air mixing device Download PDF

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Publication number
EP0421182A2
EP0421182A2 EP90117912A EP90117912A EP0421182A2 EP 0421182 A2 EP0421182 A2 EP 0421182A2 EP 90117912 A EP90117912 A EP 90117912A EP 90117912 A EP90117912 A EP 90117912A EP 0421182 A2 EP0421182 A2 EP 0421182A2
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EP
European Patent Office
Prior art keywords
air
air mixer
mixer according
plates
flow
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP90117912A
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German (de)
French (fr)
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EP0421182A3 (en
EP0421182B1 (en
Inventor
Gerold Fleissner
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Truetzschler Nonwovens GmbH
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Fleissner GmbH
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Publication of EP0421182A3 publication Critical patent/EP0421182A3/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/40—Static mixers
    • B01F25/42—Static mixers in which the mixing is affected by moving the components jointly in changing directions, e.g. in tubes provided with baffles or obstructions
    • B01F25/43—Mixing tubes, e.g. wherein the material is moved in a radial or partly reversed direction
    • B01F25/431—Straight mixing tubes with baffles or obstructions that do not cause substantial pressure drop; Baffles therefor
    • B01F25/4315—Straight mixing tubes with baffles or obstructions that do not cause substantial pressure drop; Baffles therefor the baffles being deformed flat pieces of material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/40—Static mixers
    • B01F25/42—Static mixers in which the mixing is affected by moving the components jointly in changing directions, e.g. in tubes provided with baffles or obstructions
    • B01F25/43—Mixing tubes, e.g. wherein the material is moved in a radial or partly reversed direction
    • B01F25/431—Straight mixing tubes with baffles or obstructions that do not cause substantial pressure drop; Baffles therefor
    • B01F25/4316—Straight mixing tubes with baffles or obstructions that do not cause substantial pressure drop; Baffles therefor the baffles being flat pieces of material, e.g. intermeshing, fixed to the wall or fixed on a central rod
    • B01F25/43161—Straight mixing tubes with baffles or obstructions that do not cause substantial pressure drop; Baffles therefor the baffles being flat pieces of material, e.g. intermeshing, fixed to the wall or fixed on a central rod composed of consecutive sections of flat pieces of material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/40—Static mixers
    • B01F25/42—Static mixers in which the mixing is affected by moving the components jointly in changing directions, e.g. in tubes provided with baffles or obstructions
    • B01F25/43—Mixing tubes, e.g. wherein the material is moved in a radial or partly reversed direction
    • B01F25/431—Straight mixing tubes with baffles or obstructions that do not cause substantial pressure drop; Baffles therefor
    • B01F25/4316—Straight mixing tubes with baffles or obstructions that do not cause substantial pressure drop; Baffles therefor the baffles being flat pieces of material, e.g. intermeshing, fixed to the wall or fixed on a central rod
    • B01F25/43163—Straight mixing tubes with baffles or obstructions that do not cause substantial pressure drop; Baffles therefor the baffles being flat pieces of material, e.g. intermeshing, fixed to the wall or fixed on a central rod in the form of small flat plate-like elements

Definitions

  • the invention relates to an air mixer which is arranged in the flow direction of an at least partially heated air stream in front of a heat treatment chamber, e.g. for drying textile webs, and for mixing the air layers present in this air stream with different temperatures, consisting of air deflection and swirling devices arranged in the flow channel.
  • a device for evenly distributing air is known for example from DE-PS 11 53 872.
  • this device is used for the air conditioning of rooms that are to be ventilated with warm heating air without significant drafts.
  • air outlets are provided perpendicular to the flow channel, which open into a swirl chamber, from which the air flow flows out laterally in a spiral.
  • Such constructions are not suitable for achieving a uniform temperature in previously heated air quantities.
  • This also applies to the device according to US Pat. No. 3,854,386, in which webs are arranged vertically on an annular disk comparable to a circular disk, with which the supply air flow can be divided into radial individual jets.
  • pivotable webs could also be provided in the flow channel for the air mixing, but with such webs only the air flows could be divided into individual streams. A satisfactory mixing of the thermal streaks cannot be achieved.
  • the devices according to US Pat. No. 2,791,170 in which the supply air flow is also divided into individual jets by means of radially arranged webs, these also being inclined to produce vortices can be arranged inclined to each other in the air flow.
  • the object of the invention is to develop an air mixer with which hot and cooler air layers can be mixed with one another, e.g. on the way to a heat treatment chamber in which only a uniformly heated amount of air is to be available for the heat treatment of material webs.
  • the invention provides that a plurality of air deflection plates arranged parallel to one another are provided over the entire cross section of the flow channel, that is to say perpendicular to the flow direction, which extend in the flow direction of the air channel and are evenly inclined over the entire cross section of the flow channel. If the inclination of the sheets is advantageously oriented so that the air is blown towards the center of the channel, a large number of individual air jets meet there, which then mix with one another.
  • the air mixer consists of individual parts arranged one behind the other and these air mixer parts each direct the air in a different direction.
  • it is intended to align the plates of the adjacent air mixer parts perpendicular to each other and to direct the air flow into the center of the duct.
  • the air mixer consists of three parts arranged one behind the other, the first part being made of sheets arranged in a circle, which - as said - must be arranged conically in order to direct the air into the center of the duct. Following this, only plates arranged in parallel should be provided in the second part however in turn are aligned towards each other in their inclination. A third part is then arranged in its metal sheets perpendicular to the upstream one, which ultimately results in complete mixing of the air flows without any remaining heat streaks.
  • the air mixer according to the invention has many possible uses. It can be used to mix layers of air with extremely different temperatures.
  • a through-flow dryer is shown, on the basis of which the construction of this air mixer is to be explained in more detail.
  • a through-flow or screen drum dryer consists of a housing 1 which is completely closed and provided with an inlet and outlet and which is subdivided by a vertical wall 2 into a treatment room 3 and a fan room 4.
  • the fan chamber 4 can also be provided independently of this housing 1, with the result that the bearings of the sieve drum 5 rotatably mounted in the treatment chamber 3 do not have to be arranged within the hot atmosphere.
  • a sieve fabric (not shown in the drawing) lies on the sieve drum 5, which is advantageous for a more uniform support of the textile material 6.
  • the sieve drum 5 is on the inside shielded from the suction by a cover 7.
  • the cover is shown here at a point where the textile material also rests on the screening drum, which is contradictory in this respect.
  • the cover should be offset by degrees.
  • a sieve cover 8 is provided in the treatment room 3, which is provided for generating an air backlog to even out the air flows to be flowed onto the sieve drum 5.
  • the radial fan 9 is rotatably mounted, which places the inside of the screen drum 5 under suction and accelerates the treatment air upwards for regeneration in a heating device 10.
  • the treatment air circulated in the circuit must be both accelerated and heated after each flow-through process.
  • a direct gas heater 10 is used.
  • amounts of air that can no longer be heated with a heater inside the housing 1 can be managed here.
  • the temperature required on the textile material 6 being between 120 and 300 ° C.
  • the heating gases that heat this circulating treatment air are between 800 and 900 ° C hot. A considerable effort is therefore necessary to distribute these hot combustion gases evenly with the circulated treatment air.
  • the circulating air accelerated upwards by the fan 9 in the direction of the arrow 11 flows to the combustion tube 12.
  • a certain amount of exhaust air which is represented by the arrow 13
  • the fan 9 is supplied with fresh air 13 '.
  • the combustion gases generated by the burner 14 mix in the tube 12 with the circulating air accelerated by the fan 9. Due to the high temperature differences, special effort is required to mix the air streaks of different temperatures.
  • an air mixer 15 required, which can be arranged at the end of the tube 12 just before the right-angled deflection 16 or afterwards. After this intensive mixing of the individual air components, the uniformly heated air then flows in via a channel 18 to the top of the screen drum or via channel 19 to the bottom of the screen drum.
  • the air mixer 15, according to Figures 2 and 3, consists of several air deflection and swirling devices.
  • a plurality of sheets 17 extending in the direction of flow are arranged across the entire flow channel 12 and are inclined in the direction of flow, specifically the respective sheets 17 are aligned with the center of the flow channel 12, so that on one half of the duct the air is blown to the left to the center and on the other half of the duct the air is blown to the right to the center or in a subsequent air mixing section from top to bottom and from bottom to top.
  • the sheets 17 are arranged in a circle and aligned in a funnel shape. This in turn displaces the air in the middle of the flow channel so that the respective air flows meet on all sides in the middle.
  • the air mixer parts are arranged three times in succession.
  • the circular part is first provided in the air flow direction (arrows), where the metal sheets blow the air into the center of the flow channel in a funnel shape.
  • a part 22 then follows at a short distance 21, the sheets of which are oriented perpendicularly as shown in FIGS. 2 and 3 and blow the treatment air to the center of the treatment channel on account of their different inclinations.
  • the third part 23 of the air mixer also has sheets arranged parallel to one another, which are inclined towards the center, but their orientation is perpendicular to the air mixing part 22, so that again a redirection of the treatment air and thus an intensive mixing is achieved.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Dispersion Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Drying Of Solid Materials (AREA)
  • Air-Flow Control Members (AREA)
  • Percussion Or Vibration Massage (AREA)
  • Processing Of Solid Wastes (AREA)
  • Incineration Of Waste (AREA)

Abstract

In dryers with gas heating, it is a particular problem uniformly to mix the combustion gases produced with the burner with the treatment air which is circulated in the circuit. In order to achieve this, a special construction of the air mixing device is envisaged, which consists of three parts arranged one behind another, the treatment air being in each part of different construction in each case deflected to the centre of the treatment duct and in this connection mixed with the air flows which originate from the sides. It is advantageous, firstly by means of a funnel-shaped air mixing part and then by means of such with sheets arranged parallel to one another, which are first arranged vertically and then transversely thereto, to create swirling in each case. <IMAGE>

Description

Die Erfindung bezieht sich auf einen Luftmischer, der in Strömungs­richtung eines zumindest teilweise aufgeheizten Luftstromes vor einer Wärmebehandlungskammer, z.B. zum Trocknen von textilen Waren­bahnen, angeordnet ist und zum Vermischen der in diesem Luftstrom vorhandenen Luftschichten mit unterschiedlichen Temperaturen vorge­sehen ist, bestehend aus in dem Strömungskanal angeordneten Luftablenkungs- und verwirbelungseinrichtungen.The invention relates to an air mixer which is arranged in the flow direction of an at least partially heated air stream in front of a heat treatment chamber, e.g. for drying textile webs, and for mixing the air layers present in this air stream with different temperatures, consisting of air deflection and swirling devices arranged in the flow channel.

Eine Vorrichtung zum gleichmäßigen Verteilen von Luft ist beispiels­weise aus der DE-PS 11 53 872 bekannt. Diese Einrichtung dient jedoch zur Klimatisierung von Räumen, die ohne wesentliche Zugerscheinungen mit warmer Heizluft belüftet werden sollen. Senk­recht zum Strömungskanal sind dazu Luftauslässe vorgesehen, die in eine Verwirbelungskammer münden, aus denen die Luftströmung spiralförmig seitlich ausströmt. Derartige Konstruktionen sind zur Erzielung einer gleichmäßigen Temperatur in zuvor aufgeheizten Luftmengen nicht geeignet. Dies gilt auch für die Vorrichtung nach der US-PS 3 854 386, bei der auf einer mit einer Kreisscheibe vergleichbaren Ringscheibe senkrecht angeordnete Stege angeordnet sind, mit denen sich der Zuluftstrom in radiale Einzelstrahlen aufteilen läßt. Diese verschwenkbaren Stege könnten auch in dem Strömungskanal für die Luftvermischung vorgesehen werden, jedoch könnten mit solchen Stegen lediglich die Luftströme in Einzelstrahen aufgeteilt werden. Eine befriedigende Durchmischung der Wärme­schlieren läßt sich nicht erzielen. Ähnliches gilt bezüglich den Einrichtungen nach der US-PS 2 791 170, bei denen der Zuluftstrom ebenfalls durch radial angeordnete Stege in Einzelstrahlen unterteilt wird, wobei diese zur Erzeugung von Wirbeln auch schräg zueinander geneigt im Luftstrom angeordnet sein können.A device for evenly distributing air is known for example from DE-PS 11 53 872. However, this device is used for the air conditioning of rooms that are to be ventilated with warm heating air without significant drafts. For this purpose, air outlets are provided perpendicular to the flow channel, which open into a swirl chamber, from which the air flow flows out laterally in a spiral. Such constructions are not suitable for achieving a uniform temperature in previously heated air quantities. This also applies to the device according to US Pat. No. 3,854,386, in which webs are arranged vertically on an annular disk comparable to a circular disk, with which the supply air flow can be divided into radial individual jets. These pivotable webs could also be provided in the flow channel for the air mixing, but with such webs only the air flows could be divided into individual streams. A satisfactory mixing of the thermal streaks cannot be achieved. The same applies to the devices according to US Pat. No. 2,791,170, in which the supply air flow is also divided into individual jets by means of radially arranged webs, these also being inclined to produce vortices can be arranged inclined to each other in the air flow.

Ausgehend von einer Vorrichtung anfangs genannter Art liegt der Erfindung die Aufgabe zugrunde, einen Luftmischer zu entwickeln, mit dem heiße und kühlere Luftschichten miteinander vermischt wer­den können, und zwar z.B. auf dem Wege zu einer Wärmebehand­lungskammer, in der nur noch eine gleichmäßig aufgeheizte Luftmenge zur Wärmebehandlung von Warenbahnen zur Verfügung stehen soll.Starting from a device of the type mentioned initially, the object of the invention is to develop an air mixer with which hot and cooler air layers can be mixed with one another, e.g. on the way to a heat treatment chamber in which only a uniformly heated amount of air is to be available for the heat treatment of material webs.

Zur Lösung der gestellten Aufgabe sieht die Erfindung vor, daß über den ganzen Querschnitt des Strömungskanals, also senkrecht zur Strömungsrichtung, mehrere parallel zueinander angeordnete Luftum­lenkbleche vorgesehen sind, die sich in Strömungsrichtung des Luftkanals erstrecken und über den gesamten Querschnitt des Strömungskanals gleichmäßig geneigt sind. Wenn mit Vorteil die Neigung der Bleche so ausgerichtet ist, daß die Luft zur Mitte des Kanals hingeblasen wird, so treffen sich dort eine Vielzahl von einzelnen Luftstrahlen, die sich dann miteinander vermischen.To achieve the object, the invention provides that a plurality of air deflection plates arranged parallel to one another are provided over the entire cross section of the flow channel, that is to say perpendicular to the flow direction, which extend in the flow direction of the air channel and are evenly inclined over the entire cross section of the flow channel. If the inclination of the sheets is advantageously oriented so that the air is blown towards the center of the channel, a large number of individual air jets meet there, which then mix with one another.

Besonders vorteilhaft ist es, wenn der Luftmischer aus einzelnen hintereinander angeordneten Teilen besteht und diese Luftmischerteile die Luft jeweils in eine andere Richtung lenken. Es ist dabei z.B daran gedacht, die Bleche der benachbarten Luftmischerteile senk­recht zueinander auszurichten und jeweils die Luftströmung in die Mitte des Kanals zu lenken. Auch ist es denkbar, durch kreisförmig angeordnete Bleche, die jeweils zur Mitte hin geneigt sind, die Luft in die Mitte zu lenken und dort mit anderen Strömungen zu vermischen.It is particularly advantageous if the air mixer consists of individual parts arranged one behind the other and these air mixer parts each direct the air in a different direction. For example, it is intended to align the plates of the adjacent air mixer parts perpendicular to each other and to direct the air flow into the center of the duct. It is also conceivable to direct the air into the center by means of sheets arranged in a circle, each inclined towards the center, and to mix it there with other currents.

Es hat sich als besonders vorteilhaft herausgestellt, wenn der Luft­mischer aus drei hintereinander angeordneten Teilen besteht, wobei der erste Teil aus kreisförmig angeordneten Blechen bestehen sollte, die - wie gesagt - konisch angeordnet sein müssen, um die Luft in die Mitte des Kanals zu lenken. Im Anschluß daran sollten lediglich parallel angeordnete Bleche im zweiten Teil vorgesehen sein, die jedoch wiederum aufeinander zu in ihrer Schräge ausgerichtet sind. Ein dritter Teil ist dann in seinen Blechen senkrecht zum vorgeordneten angeordnet, was letztlich eine vollständige Durch­mischung der Luftströmungen ohne verbleibene Hitzeschlieren zum Ergebnis hat.It has proven to be particularly advantageous if the air mixer consists of three parts arranged one behind the other, the first part being made of sheets arranged in a circle, which - as said - must be arranged conically in order to direct the air into the center of the duct. Following this, only plates arranged in parallel should be provided in the second part however in turn are aligned towards each other in their inclination. A third part is then arranged in its metal sheets perpendicular to the upstream one, which ultimately results in complete mixing of the air flows without any remaining heat streaks.

In der Zeichnung ist ein Ausführungsbeispiel der Vorrichtung nach der Erfindung dargestellt. Es zeigen:

  • Figur 1: einen Schnitt quer durch einen Durchströmtrockner, der auf seiner Oberseite einen Brenner aufweist, in dem die Umluft mit neuen Heizgasen vermischt wird,
  • Figur 2: die Draufsicht auf den Luftmischer mit drei nur teilweise sichtbaren unterschiedlichen Blechausrichtungen und
  • Figur 3: in perspektivischer Darstellung der Luftmischer gemäß Figur 2 mit den drei hintereinander angeordneten Luftmischteilen.
In the drawing, an embodiment of the device according to the invention is shown. Show it:
  • FIG. 1 shows a section across a through-flow dryer which has a burner on its top in which the circulating air is mixed with new heating gases,
  • Figure 2: the top view of the air mixer with three only partially visible sheet metal orientations and
  • Figure 3: in a perspective view of the air mixer according to Figure 2 with the three air mixing parts arranged one behind the other.

Der erfindungsgemäße Luftmischer hat vielerlei Anwendungsmöglich­keiten. Mit ihm können Luftschichten mit extrem unterschiedlichen Temperaturen miteinander vermischt werden. Im Ausführungsbeispiel ist ein Durchströmtrockner dargestellt, anhand dessen die Konstruk­tion dieses Luftmischers näher erläutert werden soll.The air mixer according to the invention has many possible uses. It can be used to mix layers of air with extremely different temperatures. In the exemplary embodiment, a through-flow dryer is shown, on the basis of which the construction of this air mixer is to be explained in more detail.

Wie bekannt, besteht ein Durchström- oder Siebtrommeltrockner aus einem rundum geschlossenen und mit einem Ein- und Auslauf versehenen Gehäuse 1, das durch eine lotrechte Wandung 2 in einen Behandlungsraum 3 und einen Ventilatorraum 4 unterteilt ist. Der Ventilatorraum 4 kann auch unabhängig von diesem Gehäuse 1 vorgesehen sein, was zur Folge hat, daß die Lager der im Behandlungsraum 3 drehbar gelagerten Siebtrommel 5 nicht innerhalb der heißen Atmosphäre angeordnet sein müssen. Auf der Siebtrommel 5 liegt im allgemeinen ein in der Zeichnung nicht dargestelltes Siebgewebe auf, das für eine gleichmäßigere Auflage des Textilgutes 6 vorteilhaft ist. In dem Umfangsbereich, den das Textilgut 6 die Siebtrommel nicht bedeckt, ist die Siebtrommel 5 auf der Innenseite durch eine Abdeckung 7 gegen den Saugzug abgeschirmt. Die Abdeckung ist hier an einer Stelle dargestellt, an der auch das Textilgut auf der Siebtrommel aufliegt, was insofern widersprüchlich ist. Die Abdeckung soll hier um Winkelgrade versetzt sein. Oberhalb und unterhalb der Siebtrommel ist im Behandlungsraum 3 eine Siebdecke 8 vorgesehen, die zur Erzeugung eines Luftstaus zur Vergleichmäßigung der auf die Siebtrommel 5 zu strömenden Luftströ­mungen vorgesehen ist. Im Ventilatorraum 4 ist der Radialventilator 9 drehbar gelagert, der das Innere der Siebtrommel 5 unter Saugzug setzt und die Behandlungsluft nach oben zur Regeneration in einer Heizeinrichtung 10 beschleunigt.As is known, a through-flow or screen drum dryer consists of a housing 1 which is completely closed and provided with an inlet and outlet and which is subdivided by a vertical wall 2 into a treatment room 3 and a fan room 4. The fan chamber 4 can also be provided independently of this housing 1, with the result that the bearings of the sieve drum 5 rotatably mounted in the treatment chamber 3 do not have to be arranged within the hot atmosphere. In general, a sieve fabric (not shown in the drawing) lies on the sieve drum 5, which is advantageous for a more uniform support of the textile material 6. In the peripheral area that the textile material 6 does not cover the sieve drum, the sieve drum 5 is on the inside shielded from the suction by a cover 7. The cover is shown here at a point where the textile material also rests on the screening drum, which is contradictory in this respect. The cover should be offset by degrees. Above and below the sieve drum, a sieve cover 8 is provided in the treatment room 3, which is provided for generating an air backlog to even out the air flows to be flowed onto the sieve drum 5. In the fan chamber 4, the radial fan 9 is rotatably mounted, which places the inside of the screen drum 5 under suction and accelerates the treatment air upwards for regeneration in a heating device 10.

Die im Kreislauf umgewälzte Behandlungsluft muß nach jedem Durch­strömungsvorgang sowohl beschleunigt als auch aufgeheizt werden. Dazu dient im Ausführungsbeispiel nach Figur 1 eine direkte Gas­heizung 10. Je nach Konstruktion der Trommel und auch deren Größe sind hier Luftmengen zu bewältigen, die mit einer Heizung innerhalb des Gehäuses 1 nicht mehr aufzuheizen sind. Bei den hier üblichen Durchströmtrommelkonstruktionen sind etwa 100 m3 Luft/Sek. aufzuhei­zen, wobei die an dem Textilgut 6 verlangte Temperatur zwischen 120 und 300 °C liegt. Die diese im Kreislauf umgewälzte Behandlungsluft aufheizenden Heizgase sind aber zwischen 800 und 900 °C heiß. Es ist deshalb ein erheblicher Aufwand notwendig, um diese heißen Verbrennungsgase mit der umgewälzen Behandlungsluft gleichmäßig zu verteilen.The treatment air circulated in the circuit must be both accelerated and heated after each flow-through process. For this purpose, in the exemplary embodiment according to FIG. 1, a direct gas heater 10 is used. Depending on the design of the drum and also its size, amounts of air that can no longer be heated with a heater inside the housing 1 can be managed here. In the flow-through drum designs customary here, about 100 m 3 of air / sec. to heat up, the temperature required on the textile material 6 being between 120 and 300 ° C. The heating gases that heat this circulating treatment air are between 800 and 900 ° C hot. A considerable effort is therefore necessary to distribute these hot combustion gases evenly with the circulated treatment air.

Beim Ausführungsbeispiel strömt die von dem Ventilator 9 nach oben in Richtung des Pfeiles 11 beschleunigte Umwälzluft dem Ver­brennungsrohr 12 zu. Auf der Druckseite ist eine gewisse Menge Abluft, die durch den Pfeil 13 dargestellt ist, aus dem Kreislauf zu entfernen, während auf der Unterdruckseite dem Ventilator 9 Frischluft 13′ zugeführt wird. Die durch den Brenner 14 erzeugten Verbrennungsgase vermischen sich in dem Rohr 12 mit der von dem Ventilator 9 beschleunigten Umluft. Aufgrund der hohen Temperaturun­terschiede ist ein besonderer Aufwand notwendig, um die unterschied­lich warmen Luftschlieren miteinander zu vermischen. Dazu ist gemäß der dargestellten Konstruktion ein Luftmischer 15 erforderlich, der am Ende des Rohres 12 kurz vor der rechtwinkligen Umlenkung 16 oder im Anschluß daran, angeordnet sein kann. Nach dieser hier erfolgenden intensiven Vermischung der einzelnen Luftbestandteile strömt dann die gleichmäßig aufgeheizte Luft über einen Kanal 18 der Oberseite der Siebtrommel oder über den Kanal 19 der Unterseite der Siebtrommel zu.In the exemplary embodiment, the circulating air accelerated upwards by the fan 9 in the direction of the arrow 11 flows to the combustion tube 12. On the pressure side, a certain amount of exhaust air, which is represented by the arrow 13, is to be removed from the circuit, while on the vacuum side the fan 9 is supplied with fresh air 13 '. The combustion gases generated by the burner 14 mix in the tube 12 with the circulating air accelerated by the fan 9. Due to the high temperature differences, special effort is required to mix the air streaks of different temperatures. This is according to the construction shown an air mixer 15 required, which can be arranged at the end of the tube 12 just before the right-angled deflection 16 or afterwards. After this intensive mixing of the individual air components, the uniformly heated air then flows in via a channel 18 to the top of the screen drum or via channel 19 to the bottom of the screen drum.

Der Luftmischer 15, nach den Figuren 2 und 3, besteht aus mehreren Luftablenkungs- und Verwirbelungseinrichtungen. Um eine gleichmäßi­ge Vermischung der Luftschlieren zu erzeugen, ist quer über den gesamten Strömungskanal 12 eine Vielzahl von in Strömungsrichtung sich erstreckenden Blechen 17 angeordnet, die in Strömungsrichtung geneigt sind, und zwar sind die jeweiligen Bleche 17 jeweils zur Mitte des Strömungskanals 12 ausgerichtet, so daß auf der einen Hälfte des Kanals die Luft nach links zur Mitte und auf der anderen Hälfte des Kanals die Luft nach rechts zur Mitte oder in einem folgenden Luftmischteil von oben nach unten und von unten nach oben geblasen wird. In einer dritten Möglichkeit sind die Bleche 17 kreisförmig angeordnet und trichterförmig ausgerichtet. Dadurch wird wiederum die Luft in die Mitte des Strömungskanals verlagert, so daß sich dort die jeweiligen Luftströme aller Seiten in der Mitte treffen.The air mixer 15, according to Figures 2 and 3, consists of several air deflection and swirling devices. In order to produce a uniform mixing of the air streaks, a plurality of sheets 17 extending in the direction of flow are arranged across the entire flow channel 12 and are inclined in the direction of flow, specifically the respective sheets 17 are aligned with the center of the flow channel 12, so that on one half of the duct the air is blown to the left to the center and on the other half of the duct the air is blown to the right to the center or in a subsequent air mixing section from top to bottom and from bottom to top. In a third possibility, the sheets 17 are arranged in a circle and aligned in a funnel shape. This in turn displaces the air in the middle of the flow channel so that the respective air flows meet on all sides in the middle.

Es hat sich als vorteilhaft herausgestellt, wenn die Luftmischerteile dreifach hintereinander angeordnet sind. Im Ausführungsbeispiel ist dazu in der Luftströmungsrichtung (Pfeile) zuerst der kreisförmige Teil vorgesehen, wo die Bleche trichterförmig die Luft in die Mitte des Strömungskanals blasen. Mit kurzem Abstand 21 folgt dann ein Teil 22, dessen Bleche gemäß Figur 2 und 3 lotrecht ausgerichtet sind und die Behandlungsluft jeweils zur Mitte des Behandlungs­kanals aufgrund ihrer unterschiedlichen Neigung blasen. Der dritte Teil 23 des Luftmischers weist ebenfalls parallel zueinander angeordnete Bleche auf, die zur Mitte hin geneigt sind, jedoch ist deren Ausrichtung senkrecht zum Luftmischteil 22, so daß wie­derum eine erneute Umlenkung der Behandlungsluft und damit eine intensive Mischung erzielt wird.It has proven to be advantageous if the air mixer parts are arranged three times in succession. In the exemplary embodiment, the circular part is first provided in the air flow direction (arrows), where the metal sheets blow the air into the center of the flow channel in a funnel shape. A part 22 then follows at a short distance 21, the sheets of which are oriented perpendicularly as shown in FIGS. 2 and 3 and blow the treatment air to the center of the treatment channel on account of their different inclinations. The third part 23 of the air mixer also has sheets arranged parallel to one another, which are inclined towards the center, but their orientation is perpendicular to the air mixing part 22, so that again a redirection of the treatment air and thus an intensive mixing is achieved.

Claims (10)

1. Luftmischer, der in Strömungsrichtung eines zumindest teilweise aufgeheizten Luftstromes vor einer Wärmebehandlungskammer, z.B. zum Trocknen von textilen Warenbahnen, angeordnet ist und zum Vermischen der in diesem Luftstrom vorhandenen Luft­schichten mit unterschiedlichen Temperaturen vorgesehen ist, bestehend aus in dem Strömungskanal angeordneten Luft­ablenkungs- und -verwirbelungseinrichtungen, dadurch gekenn­zeichnet, daß über den ganzen Querschnitt des Strömungskanals (12) mehrere parallel zueinander angeordnete Luftumlenkbleche (17) vorgesehen sind.1. Air mixer, which in the direction of flow of an at least partially heated air stream in front of a heat treatment chamber, e.g. for drying textile webs, is arranged and for mixing the air layers present in this air stream with different temperatures is provided, consisting of air deflection and swirling devices arranged in the flow channel, characterized in that several over the entire cross section of the flow channel (12) Air baffles (17) arranged to each other are provided. 2. Luftmischer nach Anspruch 1, dadurch gekennzeichnet, daß diese Bleche (17) sich in Strömungsrichtung (Pfeile) erstrecken und zu dieser über den ganzen Querschnitt des Strömungskanals (12) geneigt sind.2. Air mixer according to claim 1, characterized in that these sheets (17) extend in the direction of flow (arrows) and to this over the entire cross section of the flow channel (12) are inclined. 3. Luftmischer nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Bleche (17) über den ganzen Querschnitt des Strömungs­kanals (12) um den gleichen Winkel (Fig. 3) geneigt sind.3. Air mixer according to claim 1 or 2, characterized in that the plates (17) over the entire cross section of the flow channel (12) are inclined by the same angle (Fig. 3). 4. Luftmischer nach einem der Ansprüche 1 - 3, dadurch gekenn­zeichnet, daß die Fläche des Luftmischers bezüglich der Neigung der Bleche (17) mittig unterteilt ist und die beiden Hälften Bleche (17) aufweisen, die jeweils zur Mitte des Strömungs­kanals (12) hin geneigt sind (Fig. 3).4. Air mixer according to one of claims 1-3, characterized in that the surface of the air mixer with respect to the inclination of the plates (17) is divided in the middle and the two halves have plates (17), each towards the center of the flow channel (12) are inclined (Fig. 3). 5. Luftmischer nach einem der Ansprüche 1 - 4, dadurch gekennzeichnet, daß die Bleche (17) kreisförmig, also wegen der Neigung trichterförmig, über den Querschnitt des Luftmischers (20) angeordnet und zur Mitte des Kanals hin geneigt sind.5. Air mixer according to one of claims 1-4, characterized in that the plates (17) are circular, that is to say funnel-shaped because of the inclination, are arranged over the cross section of the air mixer (20) and are inclined towards the center of the channel. 6. Luftmischer nach einem der Ansprüche 1 - 5, dadurch gekenn­zeichnet, daß zwei Luftmischteile hintereinander angeordnet sind.6. Air mixer according to one of claims 1-5, characterized in that two air mixing parts are arranged one behind the other. 7. Luftmischer nach Anspruch 6, dadurch gekennzeichnet, daß mehr als zwei, vorzugsweise drei Luftmischteile hintereinander ange­ordnet sind.7. Air mixer according to claim 6, characterized in that more than two, preferably three air mixing parts are arranged one behind the other. 8. Luftmischer nach Anspruch 6 oder 7, dadurch gekennzeichnet, daß die Bleche (17) der hintereinander angeordneten Luftmisch­teile (20, 22, 23) unterschiedlich geneigt sind.8. Air mixer according to claim 6 or 7, characterized in that the plates (17) of the air mixing parts (20, 22, 23) arranged one behind the other are inclined differently. 9. Luftmischer nach Anspruch 8, dadurch gekennzeichnet, daß die Bleche (17) der hintereinander angeordneten Luftmischteile (20, 22, 23) senkrecht zueinander angeordnet sind.9. Air mixer according to claim 8, characterized in that the plates (17) of the air mixing parts (20, 22, 23) arranged one behind the other are arranged perpendicular to one another. 10. Luftmischer nach einem der Ansprüche 7 - 9, dadurch gekenn­zeichnet, daß in Strömungsrichtung (Pfeile) der zu vermischen­den Luft zuerst der kreisförmige Teil (20) des Luftmischers und dann ggf. mit kurzem Abstand (21) ein Teil (22) mit parallel zueinander angeordneten und jeweils zur Mitte hin geneigten Blechen (17) angeordnet ist, dem wiederum in Strömungsrichtung ggf. mit kurzem Abstand (21) der dritte Teil (23) folgt, dessen Bleche (17) senkrecht zum davor angeordneten ausgerichtet sind.10. Air mixer according to one of claims 7-9, characterized in that in the direction of flow (arrows) of the air to be mixed, first the circular part (20) of the air mixer and then optionally with a short distance (21) a part (22) with parallel arranged to each other and each inclined towards the center is arranged, which in turn follows in the flow direction, possibly with a short distance (21), the third part (23), the plates (17) of which are aligned perpendicular to the one arranged in front of them.
EP90117912A 1989-09-30 1990-09-18 Air mixing device Expired - Lifetime EP0421182B1 (en)

Applications Claiming Priority (2)

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DE3932837 1989-09-30
DE3932837A DE3932837A1 (en) 1989-09-30 1989-09-30 AIR MIXER

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EP0421182A2 true EP0421182A2 (en) 1991-04-10
EP0421182A3 EP0421182A3 (en) 1991-11-27
EP0421182B1 EP0421182B1 (en) 1994-08-03

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US (1) US5150535A (en)
EP (1) EP0421182B1 (en)
JP (1) JP2829324B2 (en)
AT (1) ATE109372T1 (en)
DE (2) DE3932837A1 (en)
DK (1) DK0421182T3 (en)

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ITFI20100067A1 (en) * 2010-04-13 2011-10-14 Unitech Textile Machinery Spa "Stenter"
EP3168559A1 (en) * 2011-09-21 2017-05-17 Trützschler Nonwovens GmbH Heating system for heating a gaseous treatment medium for a drier
IT201900022905A1 (en) * 2019-12-04 2021-06-04 Toscotec S P A STATIC MIXER

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US5915813A (en) * 1996-05-21 1999-06-29 Fort James Corporation Apparatus and method for drying a wet web and modifying the moisture profile thereof
DE19720065C1 (en) * 1997-05-14 1998-12-17 Helmut Fresenberger Oven for drying painted samples
DE19806427A1 (en) * 1998-02-17 1999-08-19 Fleissner Maschf Gmbh Co Air mixer for static mixing of two air flows
EP1170054B1 (en) * 2000-06-19 2003-01-29 Balcke-Dürr GmbH Mixer for mixing gases and other Newtonian liquids
US6431859B1 (en) 2001-01-12 2002-08-13 North American Manufacturing Company Combustion gas and air recovery apparatus
US7448147B2 (en) * 2004-11-22 2008-11-11 Metso Paper Usa, Inc. Nozzle insert for a Yankee impingement hood
DE102005017187B4 (en) * 2005-04-13 2007-06-21 Lindauer Dornier Gmbh Continuous dryers in multi-day construction, especially for plate-shaped products
CN106268401A (en) * 2016-09-26 2017-01-04 重庆方浩建筑保温材料有限公司万盛分公司 A kind of warming plate microgranule uniform mixing feed device
CN106582411B (en) * 2016-11-30 2019-02-15 重庆大学 A kind of mixing method of antifreeze gas
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ITFI20100067A1 (en) * 2010-04-13 2011-10-14 Unitech Textile Machinery Spa "Stenter"
EP2378229A1 (en) * 2010-04-13 2011-10-19 Unitech Textile Machinery S.p.a. Stenter
EP3168559A1 (en) * 2011-09-21 2017-05-17 Trützschler Nonwovens GmbH Heating system for heating a gaseous treatment medium for a drier
US10539369B2 (en) 2011-09-21 2020-01-21 Truetzschler Nonwovens Gmbh Heating system for warming a gaseous treatment medium for a dryer
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Also Published As

Publication number Publication date
EP0421182A3 (en) 1991-11-27
DK0421182T3 (en) 1994-11-21
JPH03125895A (en) 1991-05-29
US5150535A (en) 1992-09-29
JP2829324B2 (en) 1998-11-25
DE3932837A1 (en) 1991-04-18
DE59006684D1 (en) 1994-09-08
ATE109372T1 (en) 1994-08-15
EP0421182B1 (en) 1994-08-03

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