EP0389889A1 - Operational device for gas streams in vacuum furnaces - Google Patents

Operational device for gas streams in vacuum furnaces Download PDF

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Publication number
EP0389889A1
EP0389889A1 EP90104992A EP90104992A EP0389889A1 EP 0389889 A1 EP0389889 A1 EP 0389889A1 EP 90104992 A EP90104992 A EP 90104992A EP 90104992 A EP90104992 A EP 90104992A EP 0389889 A1 EP0389889 A1 EP 0389889A1
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EP
European Patent Office
Prior art keywords
fan
batch
space
gas
furnace
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Granted
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EP90104992A
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German (de)
French (fr)
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EP0389889B1 (en
Inventor
Karlheinz Neubecker
Cordt Rohde
Gerhard Welzig
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Evonik Operations GmbH
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Degussa GmbH
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
    • C21D1/767—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material with forced gas circulation; Reheating thereof
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
    • C21D1/773—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material under reduced pressure or vacuum
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B5/00—Muffle furnaces; Retort furnaces; Other furnaces in which the charge is held completely isolated
    • F27B5/06—Details, accessories, or equipment peculiar to furnaces of these types
    • F27B5/16—Arrangements of air or gas supply devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B5/00—Muffle furnaces; Retort furnaces; Other furnaces in which the charge is held completely isolated
    • F27B5/06—Details, accessories, or equipment peculiar to furnaces of these types
    • F27B2005/062—Cooling elements
    • F27B2005/064—Cooling elements disposed in the furnace, around the chamber, e.g. coils
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B5/00—Muffle furnaces; Retort furnaces; Other furnaces in which the charge is held completely isolated
    • F27B5/06—Details, accessories, or equipment peculiar to furnaces of these types
    • F27B5/14—Arrangements of heating devices
    • F27B2005/143—Heating rods disposed in the chamber
    • F27B2005/146—Heating rods disposed in the chamber the heating rods being in the tubes which conduct the heating gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B5/00—Muffle furnaces; Retort furnaces; Other furnaces in which the charge is held completely isolated
    • F27B5/06—Details, accessories, or equipment peculiar to furnaces of these types
    • F27B5/16—Arrangements of air or gas supply devices
    • F27B2005/161—Gas inflow or outflow
    • F27B2005/164—Air supply through a set of tubes with openings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B5/00—Muffle furnaces; Retort furnaces; Other furnaces in which the charge is held completely isolated
    • F27B5/06—Details, accessories, or equipment peculiar to furnaces of these types
    • F27B5/16—Arrangements of air or gas supply devices
    • F27B2005/166—Means to circulate the atmosphere
    • F27B2005/167—Means to circulate the atmosphere the atmosphere being recirculated through the treatment chamber by a turbine

Definitions

  • the invention relates to a device for controlling gas flows in vacuum furnaces, in which the batches are both heated and quenched up to temperatures of approximately 750 ° C. in a batch space with gas circulation by means of a fan.
  • Such furnaces usually consist of a cylindrical pressure housing in which there is a heated batch space surrounded by thermal insulation, a heat exchanger and a fan for circulating the heating and cooling gas. It is advantageous both during the operating phase in which the batch is convectively heated and during the quenching phase, the gas through heating conductors in the form of tubes which are arranged axially on the lateral surface of the cylindrical batch space and are provided with nozzles directed towards the batch, to lead into the batch room. It is also advantageous to circulate the gas in both operating phases with the same fan.
  • Such an oven is described in DE-PS 37 36 502.
  • a control device In order to ensure that the batch can be both heated and quenched with the same gas, a control device must be present in the furnace be, which allows the gas flow circulated by the fan to be reversed between two circuits, so that in one case the gas only circulates within the heated furnace area provided with thermal insulation, and in the other case via the heat exchanger tubes arranged between the thermal insulation and the recipient wall.
  • This construction has the disadvantage that only openings with a small cross-section can be sealed by the slide, so that when they flow through, high pressure losses occur in the gas flow. Furthermore, the inflow to the fan is asymmetrical, which results in an uneven distribution of the gas flow on the heating pipes. Another disadvantage is that the travel of the slide between the two end positions is very large. For actuation a very long cylinder is required, which protrudes far from the furnace housing and limits the installation options of such a furnace.
  • the inflow of the gas must be completely radially symmetrical, only slight flow losses may occur and the actuation paths must be small.
  • This object is achieved in that two concentric, mutually displaceable cylinders are arranged between the batch space and fan in the furnace center axis, of which the outer cylinder is firmly connected to the batch space and the inner cylinder via a linkage axially between a baffle plate attached in the batch space and the Fan suction opening can be moved.
  • Figures 1 to 4 schematically show an exemplary embodiment of the control device according to the invention, wherein Figures 1 and 2 show the control device in the two end positions in a vacuum oven according to DE-PS 37 36 502 and Figures 3 and 4 show these end positions in enlargements.
  • the furnace consists of a recipient (11) in which a batch space (13) is arranged within a thermal insulation (12), which is heated via heating pipes (14) and simultaneously supplied with gas.
  • the heat exchanger (15) is located between the recipient (11) and the thermal insulation (12).
  • the control device consists of two concentric cylinders, of which the outer (1) is firmly connected to the wall (2) of the batch space (13) facing the fan. This serves as a guide for the inner cylinder (3), which is fitted into the outer cylinder (1) with little play.
  • the inner cylinder (3) can be shifted between a baffle plate (5) fastened to the batch chamber wall (2) with stud bolts (4) in the batch space (13) and the wall of a gas distribution device (7) surrounding the fan (6).
  • the actuation is preferably carried out in such a way that an axis (8) is introduced into the recipient transversely to the center axis of the furnace.
  • a shift fork (9) is attached to it, which engages a rod (10) which is inserted across the inner cylinder (3) and is firmly connected to it.
  • a rod (10) which is inserted across the inner cylinder (3) and is firmly connected to it.
  • longitudinal slots are left in the outer stationary cylinder (1).
  • the inner cylinder (3) lies with its second end face on the baffle plate (5) and seals the batch space (13).
  • An annular inflow cross-section to the furnace space outside of the thermal insulation is released at the fan suction opening.
  • the two cylinders (1 and 3) are preferably made of graphite felt, which is coated on all outer surfaces with graphite foil. This material is resistant to the temperatures that occur. Due to the low weight and the low coefficient of friction of the graphite / graphite pairing, the actuation forces are small.
  • the inflow to the fan (6) takes place completely radially symmetrically in both operating phases.
  • the flow losses can be minimized by suitable adjustment of the annular gap height to the intake cross section of the fan (6).
  • the rotation of the axis (8) required for actuation can take place, for example, by means of a compact swivel cylinder which in no way restricts the installation of the furnace.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • General Engineering & Computer Science (AREA)
  • Furnace Details (AREA)
  • Muffle Furnaces And Rotary Kilns (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
  • Drying Of Solid Materials (AREA)
  • Sampling And Sample Adjustment (AREA)
  • Investigating, Analyzing Materials By Fluorescence Or Luminescence (AREA)
  • Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
  • Separation By Low-Temperature Treatments (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
  • Physical Vapour Deposition (AREA)

Abstract

To control gas streams in vacuum furnaces, which serve for the heating and cooling of the charge parts, use is made of two concentric cylinders (1, 3) which can be moved towards one another and are arranged in the central axis of the furnace between charge space and fan (6).

Description

Die Erfindung betrifft eine Vorrichtung zur Steuerung von Gasströmen in Vakuumöfen, in denen mittels Ventilator die Chargen in einem Chargenraum unter Gasumwälzung sowohl bis zu Temperaturen von ca. 750o C sowohl erwärmt als auch abgeschreckt werden.The invention relates to a device for controlling gas flows in vacuum furnaces, in which the batches are both heated and quenched up to temperatures of approximately 750 ° C. in a batch space with gas circulation by means of a fan.

Solche Öfen bestehen in der Regel aus einem zylindrischen Druckgehäuse, in dem sich ein von einer thermischen Isolation umgebener beheizter Chargenraum, ein Wärmetauscher und ein Ventilator zur Umwälzung des Heiz- und Abkühlgases befindet. Es ist vorteilhaft, sowohl während der Betriebsphase, in der die charge konvektiv erwärmt wird, als auch während der Abschreckphase, das Gas durch als Rohre ausgebildete Heizleiter, die an der Mantelfläche des zylindrischen Chargenraumes axial angeordnet und mit auf die Charge gerichteten Düsen versehen sind, in den Chargenraum zu leiten. Weiterhin ist es vorteilhaft, das Gas in beiden Betriebsphasen mit dem gleichen Ventilator umzuwälzen. Ein solcher Ofen ist in der DE-PS 37 36 502 beschrieben.Such furnaces usually consist of a cylindrical pressure housing in which there is a heated batch space surrounded by thermal insulation, a heat exchanger and a fan for circulating the heating and cooling gas. It is advantageous both during the operating phase in which the batch is convectively heated and during the quenching phase, the gas through heating conductors in the form of tubes which are arranged axially on the lateral surface of the cylindrical batch space and are provided with nozzles directed towards the batch, to lead into the batch room. It is also advantageous to circulate the gas in both operating phases with the same fan. Such an oven is described in DE-PS 37 36 502.

Um zu gewährleisten, daß mit dem gleichen Gas die Charge sowohl aufgeheizt als auch abgeschreckt werden kann, muß im Ofen eine Steuervorrichtung vorhanden sein, die erlaubt, den vom Ventilator umgewälzten Gasstrom zwischen zwei Kreisläufen umzusteuern, sodaß im einen Fall das Gas nur innerhalb des mit einer thermischen Isolierung versehenen beheizten Ofenbereiches zirkuliert, und im anderen Fall über die zwischen thermischer Isolation und Rezipientenwand angeordneten Wärmetauscherrohre geleitet wird.In order to ensure that the batch can be both heated and quenched with the same gas, a control device must be present in the furnace be, which allows the gas flow circulated by the fan to be reversed between two circuits, so that in one case the gas only circulates within the heated furnace area provided with thermal insulation, and in the other case via the heat exchanger tubes arranged between the thermal insulation and the recipient wall.

In dem in der DE-PS 37 36 502 beschriebenen Ofen wird dies dadurch gelöst, daß zwischen Chargenraum und der Saugseite des in einer Gasverteilervorrichtung angeordneten Ventilators ein Kasten eingebaut ist, der mit Öffnungen sowohl zum Chargenraum als auch zu dem Ringraum zwischen thermischer Isolation und Rezipientenwand, in dem die Wärmetauscherrohre angeordnet sind, versehen ist. In dem Kasten befindet sich ein Schieber, der über eine Kolbenstange quer zur Ofenachse verschoben werden kann. Je nach Stellung des Schiebers werden die Öffnungen zum Chargenraum oder zum Ringraum zwischen thermischer Isolation und Rezipientenwand freigegeben und die jeweils anderen Öffnungen gleichzeitig verschlossen.In the oven described in DE-PS 37 36 502, this is achieved in that a box is installed between the batch space and the suction side of the fan arranged in a gas distribution device, which has openings both to the batch space and to the annular space between thermal insulation and recipient wall , in which the heat exchanger tubes are arranged, is provided. In the box there is a slide that can be moved across a piston rod across the furnace axis. Depending on the position of the slide, the openings to the batch space or to the annular space between the thermal insulation and the recipient wall are opened and the other openings are closed at the same time.

Diese Konstruktion hat den Nachteil, daß von dem Schieber nur Öffnungen mit kleinem Querschnitt abgedichtet werden können, so daß bei deren Durchströmung hohe Druckverluste in der Gasströmung entstehen. Weiterhin erfolgt die Zuströmung zum Ventilator unsymetrisch, was sich in einer ungleichmäßigen Verteilung des Gasstroms auf die Heizrohre auswirkt. Ein weiterer Nachteil besteht darin, daß der Verfahrweg des Schiebers zwischen den beiden Endpositionen sehr groß ist. Zur Betätigung ist ein sehr langer Zylinder notwendig, der weit aus dem Ofengehäuse herausragt und die Aufstellungsmöglichkeiten eines solchen Ofens einschränkt.This construction has the disadvantage that only openings with a small cross-section can be sealed by the slide, so that when they flow through, high pressure losses occur in the gas flow. Furthermore, the inflow to the fan is asymmetrical, which results in an uneven distribution of the gas flow on the heating pipes. Another disadvantage is that the travel of the slide between the two end positions is very large. For actuation a very long cylinder is required, which protrudes far from the furnace housing and limits the installation options of such a furnace.

Es war daher Aufgabe der vorliegenden Erfindung, eine Vorrichtung zur Steuerung von Gasströmen in Vakuumöfen zu schaffen, in denen die Chargen in einem Chargenraum unter Gasumwälzung mittels Ventilator sowohl erwärmt als auch abgekühlt werden, die es erlaubt, den Ansaugquerschnitt des Ventilators wechselweise mit dem Chargenraum oder dem Ringraum zwischen thermischer Isolation und Rezipientenwand, in dem sich die Wärmetauscherrohre befinden, zu verbinden. Dabei muß die Zuströmung des Gases vollkommen radialsymetrisch erfolgen, es dürfen nur geringe Strömungsverluste auftreten und die Betätigungswege müssen klein sein.It was therefore an object of the present invention to provide a device for controlling gas flows in vacuum furnaces, in which the batches are both heated and cooled in a batch space with gas circulation by means of a fan, which allows the intake cross section of the fan to alternate with the batch space or to connect the annular space between the thermal insulation and the recipient wall, in which the heat exchanger tubes are located. The inflow of the gas must be completely radially symmetrical, only slight flow losses may occur and the actuation paths must be small.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß zwischen Chargenraum und Ventilator in der Ofenmittelachse zwei konzentrische, gegeneinander verschiebbare Zylinder angeordnet sind, von denen der äußere fest mit dem Chargenraum verbunden ist und der innere Zylinder über ein Gestänge axial zwischen einer im Chargenraum angebrachten Prallplatte und der Ventilatoransaugöffnung verschoben werden kann.This object is achieved in that two concentric, mutually displaceable cylinders are arranged between the batch space and fan in the furnace center axis, of which the outer cylinder is firmly connected to the batch space and the inner cylinder via a linkage axially between a baffle plate attached in the batch space and the Fan suction opening can be moved.

Die Abbildungen 1 bis 4 zeigen schematisch eine beispielhafte Ausführungsform der erfindungsgemäßen Steuervorrichtung, wobei die Abbildungen 1 und 2 die Steuervorrichtung in den beiden Endpositionen in einem Vakuumofen gemäß DE-PS 37 36 502 und die Abbildungen 3 und 4 diese Endpositionen in Vergrößerungen wiedergeben.Figures 1 to 4 schematically show an exemplary embodiment of the control device according to the invention, wherein Figures 1 and 2 show the control device in the two end positions in a vacuum oven according to DE-PS 37 36 502 and Figures 3 and 4 show these end positions in enlargements.

Der Ofen besteht aus einem Rezipienten (11), in dem innerhalb einer thermischen Isolierung (12) ein Chargenraum (13) angeordnet ist, der über Heizrohre (14) beheizt und gleichzeitig mit Gas versorgt wird. Zwischen dem Rezipienten (11) und der thermischen Isolierung (12) befindet sich der Wärmetauscher (15).The furnace consists of a recipient (11) in which a batch space (13) is arranged within a thermal insulation (12), which is heated via heating pipes (14) and simultaneously supplied with gas. The heat exchanger (15) is located between the recipient (11) and the thermal insulation (12).

Die Steuervorrichtung besteht aus zwei konzentrischen Zylindern, von denen der äußere (1) fest mit der dem Ventilator zugewandten Wand (2) des Chargenraums (13) verbunden ist. Dieser dient als Führung für den inneren Zylinder (3) , der mit geringem Spiel in den äußeren Zylinder (1) eingepaßt ist. Mittels eines Gestänges kann der innere Zylinder (3) zwischen einer im Chargenraum (13) mit Stehbolzen (4) an der Chargenraumwand (2) befestigten Prallplatte (5) und der Wand einer den Ventilator (6) umgebenden Gasverteilungsvorrichtung (7) verschoben werden. Die Betätigung erfolgt vorzugsweise so, daß eine Achse (8) quer zur Ofenmittelachse in den Rezipienten eingeführt wird. Daran wird eine Schaltgabel (9) befestigt, die an einer Stange (10) angreift, die quer durch den inneren Zylinder (3) gesteckt und fest mit diesem verbunden ist. Um ein Verschieben des inneren Zylinders (3) mittels dieser Stange (10) zu ermöglichen, sind in dem äußeren feststehenden Zylinder (1) Längsschlitze ausgespart. Durch Verdrehen der Achse (8) um wenige Winkelgrade kann der bewegliche Zylinder so zwischen den in Abb. 3 und 4 dargestellten Endpositionen verschoben werden.The control device consists of two concentric cylinders, of which the outer (1) is firmly connected to the wall (2) of the batch space (13) facing the fan. This serves as a guide for the inner cylinder (3), which is fitted into the outer cylinder (1) with little play. The inner cylinder (3) can be shifted between a baffle plate (5) fastened to the batch chamber wall (2) with stud bolts (4) in the batch space (13) and the wall of a gas distribution device (7) surrounding the fan (6). The actuation is preferably carried out in such a way that an axis (8) is introduced into the recipient transversely to the center axis of the furnace. A shift fork (9) is attached to it, which engages a rod (10) which is inserted across the inner cylinder (3) and is firmly connected to it. In order to enable displacement of the inner cylinder (3) by means of this rod (10), longitudinal slots are left in the outer stationary cylinder (1). By rotating the axis (8) by a few degrees, the movable cylinder can be moved between the end positions shown in Fig. 3 and 4.

In der Position nach Abb. 3 liegt der innere Zylinder (3) mit seiner Stirnseite an der Wand der Gasverteilervorrichtung (7) an und dichtet somit den Ofenraum außerhalb der thermischen Isolation gegen die Ventilatoransaugöffnung ab. Gleichzeitig wird ein ringförmiger Zuströmquerschnitt zwischen der Prallplatte (5) und der Chargenraumwand (2) freigegeben. Der Ventilator (6) saugt somit das Gas aus dem Chargenraum (12) durch den freien Querschnitt des inneren Zylinders (3) an.In the position according to Fig. 3, the end of the inner cylinder (3) lies against the wall of the gas distributor device (7) and thus seals the furnace space outside the thermal insulation against the fan suction opening. At the same time, an annular inflow cross section is released between the baffle plate (5) and the batch space wall (2). The fan (6) thus draws in the gas from the batch space (12) through the free cross section of the inner cylinder (3).

In der Position nach Abb. 4 liegt der innere Zylinder (3) mit seiner zweiten Stirnseite an der Prallplatte (5) an und dichtet den Chargenraum (13) ab. An der Ventilatoransaugöffnung wird ein ringförmiger Zuströmquerschnitt zum Ofenraum außerhalb der thermischen Isolation freigegeben.In the position according to Fig. 4, the inner cylinder (3) lies with its second end face on the baffle plate (5) and seals the batch space (13). An annular inflow cross-section to the furnace space outside of the thermal insulation is released at the fan suction opening.

Die beiden Zylinder (1 und 3) werden vorzugsweise aus Grafithartilz ausgeführt, der auf allen Außenflächen mit Grafitfolie beschichtet ist. Dieses Material ist beständig gegen die auftretenden Temperaturen. Aufgrund des geringen Gewichts und des geringen Reibwertes der Paarung Grafit/Grafit sind die Betätigungskräfte klein.The two cylinders (1 and 3) are preferably made of graphite felt, which is coated on all outer surfaces with graphite foil. This material is resistant to the temperatures that occur. Due to the low weight and the low coefficient of friction of the graphite / graphite pairing, the actuation forces are small.

Aufgrund der ringförmigen Einströmquerschnitte erfolgt die Zuströmung zum Ventilator (6) in beiden Betriebsphasen vollkommen radialsymetrisch. Durch geeignete Abstimmung der Ringspalthöhe auf den Ansaugquerschnitt des Ventilators (6) können die Strömungsverluste minimiert werden. Die zur Betätigung notwendige Verdrehung der Achse (8) kann beispielsweise durch einen kompakten Schwenkzylinder erfolgen, der die Aufstellung des Ofens in keiner Weise einschränkt.Due to the ring-shaped inflow cross-sections, the inflow to the fan (6) takes place completely radially symmetrically in both operating phases. The flow losses can be minimized by suitable adjustment of the annular gap height to the intake cross section of the fan (6). The rotation of the axis (8) required for actuation can take place, for example, by means of a compact swivel cylinder which in no way restricts the installation of the furnace.

Claims (1)

Vorrichtung zur Steuerung von Gasströmen in Vakuumöfen, in denen die Chargen in einem Chargenraum unter Gasumwälzung mittels Ventilator sowohl erwärmt als auch abgekühlt werden,
dadurch gekennzeichnet,
daß zwischen Chargenraum (13) und Ventilator (6) in der Ofenmittelachse zwei konzentrische gegeneinander verschiebbare Zylinder (1,3) angeordnet sind, von denen der äußere (1) fest mit dem Chargenraum (13) verbunden ist, und der innere Zylinder (3) über ein Gestänge axial zwischen einer im Chargenraum (13) befestigten Prallplatte (5) und der Ventilatoransaugöffnung verschoben werden kann.Device for controlling gas flows in vacuum furnaces, in which the batches are both heated and cooled in a batch room with gas circulation by means of a fan,
characterized,
that between the batch space (13) and the fan (6) two concentric cylinders (1,3) are arranged in the furnace center axis, of which the outer (1) is firmly connected to the batch space (13), and the inner cylinder (3rd ) can be moved axially via a linkage between a baffle plate (5) fastened in the batch space (13) and the fan suction opening.
EP90104992A 1989-03-30 1990-03-16 Operational device for gas streams in vacuum furnaces Expired - Lifetime EP0389889B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3910234 1989-03-30
DE3910234A DE3910234C1 (en) 1989-03-30 1989-03-30

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EP0389889A1 true EP0389889A1 (en) 1990-10-03
EP0389889B1 EP0389889B1 (en) 1993-02-03

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US (1) US5035611A (en)
EP (1) EP0389889B1 (en)
JP (1) JPH02298214A (en)
CN (1) CN1017182B (en)
AT (1) ATE85420T1 (en)
BG (1) BG51162A3 (en)
BR (1) BR9001374A (en)
CA (1) CA2013083A1 (en)
CS (1) CS9001227A3 (en)
DD (1) DD299673A5 (en)
DE (2) DE3910234C1 (en)
DK (1) DK0389889T3 (en)
ES (1) ES2037490T3 (en)
HR (1) HRP920580A2 (en)
HU (1) HU207155B (en)
PL (1) PL161410B1 (en)
RO (1) RO105580B1 (en)
RU (1) RU1836612C (en)
YU (1) YU47220B (en)
ZA (1) ZA901722B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2778587A1 (en) * 2013-03-14 2014-09-17 Poole Ventura, Inc. Thermal diffusion chamber with convection compressor

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4034085C1 (en) * 1990-10-26 1991-11-14 Degussa Ag, 6000 Frankfurt, De
JP2579561B2 (en) * 1991-03-22 1997-02-05 東海カーボン株式会社 SiC whisker manufacturing equipment
JPH04118443U (en) * 1991-04-03 1992-10-22 大同特殊鋼株式会社 Vacuum heat treatment furnace
DE4121277C2 (en) * 1991-06-27 2000-08-03 Ald Vacuum Techn Ag Device and method for the automatic monitoring of operational safety and for controlling the process sequence in a vacuum heat treatment furnace
US5267257A (en) * 1991-08-14 1993-11-30 Grier-Jhawar-Mercer, Inc. Vacuum furnace with convection heating and cooling
FR2689225A1 (en) * 1992-03-25 1993-10-01 Stein Heurtey Physitherm Multipurpose furnace providing heat treatment in various conditions - including vacuum or forced convection under pressure as well as in still inert gas and tempering operations
US5407349A (en) * 1993-01-22 1995-04-18 International Business Machines Corporation Exhaust system for high temperature furnace
EP0934462B1 (en) * 1996-10-22 2004-12-08 van der Veken, Germaine Wind power engine
US5827044A (en) * 1997-03-26 1998-10-27 Yazici; Muammer Fan system with variable air volume control
US6349108B1 (en) * 2001-03-08 2002-02-19 Pv/T, Inc. High temperature vacuum furnace
DE202006012913U1 (en) * 2006-08-22 2006-10-19 Ipsen International Gmbh Pressure chamber for metallic work pieces, comprises a ventilator inside the chamber, and a drive motor
US8950470B2 (en) * 2010-12-30 2015-02-10 Poole Ventura, Inc. Thermal diffusion chamber control device and method
US20120168143A1 (en) * 2010-12-30 2012-07-05 Poole Ventura, Inc. Thermal Diffusion Chamber With Heat Exchanger
CN103575094A (en) * 2012-07-27 2014-02-12 苏州工业园区杰士通真空技术有限公司 Vacuum furnace convection heating device
CN106017071B (en) * 2016-05-31 2018-04-10 成都西沃克真空科技有限公司 A kind of vacuum drying oven

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1259919B (en) * 1964-06-12 1968-02-01 Harold Norregard Ipsen Furnace for the heat treatment of metal workpieces
FR2173406A5 (en) * 1972-02-23 1973-10-05 Ugine Infra
DE1919493B2 (en) * 1969-04-17 1977-06-16 ATMOSPHERIC VACUUM FURNACE
FR2436350A1 (en) * 1978-09-13 1980-04-11 Degussa VACUUM OVEN WITH GAS COOLING DEVICE
DE3736502C1 (en) * 1987-10-28 1988-06-09 Degussa Vacuum furnace for the heat treatment of metallic workpieces

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1549770A (en) * 1975-09-16 1979-08-08 Anjou M D Fan assemblies for ventilators
DE2844843C2 (en) * 1978-10-14 1985-09-12 Ipsen Industries International Gmbh, 4190 Kleve Industrial furnace for the heat treatment of metallic workpieces
US4265592A (en) * 1979-05-09 1981-05-05 Carlini Gerardo P V Centrifugal fan
US4560348A (en) * 1984-05-24 1985-12-24 Abar Ipsen Industries Gas nozzle for a heat treating furnace
US4553404A (en) * 1984-06-20 1985-11-19 Whirlpool Corporation Room air conditioner with high capacity fresh air circulation means
US4643639A (en) * 1984-12-24 1987-02-17 Sundstrand Corporation Adjustable centrifugal pump
US4859140A (en) * 1985-01-25 1989-08-22 Brod & Mcclung - Pace Co. Centrifugal fan
US4596526A (en) * 1985-03-04 1986-06-24 Worthington Industries, Inc. Batch coil annealing furnace and method
US4891008A (en) * 1986-05-21 1990-01-02 Columbia Gas Service System Corporation High temperature convection furnace
US4830610A (en) * 1986-05-21 1989-05-16 Columbia Gas Service System Corporation High temperature convection furnace
FR2614683B1 (en) * 1987-04-28 1989-06-16 Bmi Fours Ind GAS CURRENT VACUUM HEAT TREATMENT OVEN
US4854860A (en) * 1987-12-02 1989-08-08 Gas Research Institute Convective heat transfer within an industrial heat treating furnace
US4906182A (en) * 1988-08-25 1990-03-06 Abar Ipsen Industries, Inc. Gas cooling system for processing furnace

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1259919B (en) * 1964-06-12 1968-02-01 Harold Norregard Ipsen Furnace for the heat treatment of metal workpieces
DE1919493B2 (en) * 1969-04-17 1977-06-16 ATMOSPHERIC VACUUM FURNACE
FR2173406A5 (en) * 1972-02-23 1973-10-05 Ugine Infra
FR2436350A1 (en) * 1978-09-13 1980-04-11 Degussa VACUUM OVEN WITH GAS COOLING DEVICE
DE3736502C1 (en) * 1987-10-28 1988-06-09 Degussa Vacuum furnace for the heat treatment of metallic workpieces

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2778587A1 (en) * 2013-03-14 2014-09-17 Poole Ventura, Inc. Thermal diffusion chamber with convection compressor

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BR9001374A (en) 1991-04-02
HU207155B (en) 1993-03-01
ATE85420T1 (en) 1993-02-15
EP0389889B1 (en) 1993-02-03
DK0389889T3 (en) 1993-06-01
CN1017182B (en) 1992-06-24
RU1836612C (en) 1993-08-23
CS275173B2 (en) 1992-02-19
BG51162A3 (en) 1993-02-15
ES2037490T3 (en) 1993-06-16
CA2013083A1 (en) 1990-09-30
DE59000830D1 (en) 1993-03-18
YU47220B (en) 1995-01-31
US5035611A (en) 1991-07-30
DD299673A5 (en) 1992-04-30
CS9001227A3 (en) 1992-02-19
YU57790A (en) 1992-05-28
RO105580B1 (en) 1992-09-25
ZA901722B (en) 1990-12-28
JPH02298214A (en) 1990-12-10
CN1046218A (en) 1990-10-17
DE3910234C1 (en) 1990-04-12
HU902027D0 (en) 1990-08-28
PL161410B1 (en) 1993-06-30
HRP920580A2 (en) 1995-06-30

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