EP0770842B1 - Emallierofen für fadenförmige Materialen - Google Patents

Emallierofen für fadenförmige Materialen Download PDF

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Publication number
EP0770842B1
EP0770842B1 EP95830394A EP95830394A EP0770842B1 EP 0770842 B1 EP0770842 B1 EP 0770842B1 EP 95830394 A EP95830394 A EP 95830394A EP 95830394 A EP95830394 A EP 95830394A EP 0770842 B1 EP0770842 B1 EP 0770842B1
Authority
EP
European Patent Office
Prior art keywords
main chamber
recirculation duct
outlet opening
section
oven
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.)
Expired - Lifetime
Application number
EP95830394A
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English (en)
French (fr)
Other versions
EP0770842A1 (de
Inventor
Paolo Rizzotti
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
DEA TECH MACHINERY SpA
Original Assignee
DEA TECH MACHINERY SpA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by DEA TECH MACHINERY SpA filed Critical DEA TECH MACHINERY SpA
Priority to EP95830394A priority Critical patent/EP0770842B1/de
Priority to AT95830394T priority patent/ATE178985T1/de
Priority to DE69509097T priority patent/DE69509097T2/de
Publication of EP0770842A1 publication Critical patent/EP0770842A1/de
Application granted granted Critical
Publication of EP0770842B1 publication Critical patent/EP0770842B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/28—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity for treating continuous lengths of work
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B13/00—Machines and apparatus for drying fabrics, fibres, yarns, or other materials in long lengths, with progressive movement
    • F26B13/001—Drying and oxidising yarns, ribbons or the like
    • F26B13/002—Drying coated, e.g. enamelled, varnished, wires

Definitions

  • the present invention relates to an enamelling oven for wire materials, in particular metal wires for magnetic applications, of the type described in the preamble of claim 1.
  • wires such as copper or aluminium wires for example, employed in the manufacture of motor windings, transformers or coils for different uses are generally produced by drawing and subsequent covering with insulating material through a multi-layered application process.
  • enamelling plants are presently employed which consist of several stations operating immediately downstream of the drawing machine supplying the wires adapted to undergo the necessary covering operations for insulation.
  • the enamelling plants comprise a first station, in which the insulating material is applied in overlaying subsequent layers, a second station, substantially consisting of an enamelling oven arranged to cause evaporation of the solvents contained in the enamels and then carry out polymerization or crosslinking of the enamels themselves, and a third station in which cooling of the wire is carried out on its coming out of the oven.
  • enamelling ovens of the traditional type comprise a main chamber of elongated conformation which is lengthwise passed through by one or more wires movable from a chamber inlet opening to a chamber outlet opening, in a given feed direction.
  • the traditional ovens are also comprised of a recirculation duct disposed adjacent to the main chamber and associated therewith; said duct has an initial section located close to the inlet opening and provided with a suction fan and an end section, located close to the outlet opening and having a converging configuration so as to produce, by Venturi effect, an air intake from the outside through the same outlet opening of the main chamber.
  • the recirculation duct and main chamber define a closed circuit along which the fluid flow circulates in countercurrent relative to the wire feeding direction.
  • the different ducts in the oven as well as the fan are conveniently shaped so as to ensure, within the chamber, the existence of a constant vacuum condition relative to the surrounding atmosphere in order to counteract the escape of toxic gases from the inlet and outlet openings.
  • insulating enamels presently used to cover wires usually have a solid content in the range of 25-40% by weight in the case of polyesther imide (PEI) enamels and in the range of 10-25% by weight in the case of polyurethane (PU) enamels. Therefore, while passing through the main chamber, wires must lose a great amount of solvents. Said solvents are drawn into the recirculation duct and burnt, as they cannot be discharged to the surrounding atmosphere.
  • enamelling ovens have been recently widely used in which, close to the end portion of the recirculation duct, shutoff members such as gate valves, guillotine valves, or others are disposed, which shutoff members are capable of enabling an adjustment of the air velocity at the section where they are installed. While these solutions enable the amount of air entering the outlet openings of the main chamber to be adjusted, they however give rise to a strong resistance increase in the recirculation duct and therefore an increase in the static pressure upstream of the shutoff member, which results in a flow rate variation in the baking chamber. It should be also pointed out that when the Venturi effect is greatly limited there is always the risk that gas escapes from the outlet opening may occur.
  • US-A-3183605 shows an oven provided with two recirculating ducts having a common end connected with a central region of the main chamber (where the coated wire is processed) and the other end communicating with terminal opposite portions of the main chamber.
  • document US-A-3183605 shows an oven having only one recirculation duct with one end connected with a central region of the main chamber and the other end communicating with the terminal portion of the curing zone of the main chamber.
  • the oven comprises also a double Venturi duct for regulating air flow into the solvent removal zone of the main chamber preceding the curing zone.
  • the main object of the present invention is to substantially obviate all the above mentioned drawbacks.
  • Another object of the invention is to provide an oven capable of adapting itself to the various operating requirements and in particular the different requirements encountered when enamels of different physico-chemical properties are to be handled.
  • Yet another object of the invention is to provide an enamelling oven capable of carrying out adjustment of the gases recirculating in the oven in a quick and efficient manner-, as well as in particular of the cold air entering the outlet opening of the main chamber.
  • Oven 1 is interposed between a wire enamelling station in which insulating enamel is applied to the wire or wires to be enamelled and which is located upstream of oven 1, and a cooling station for the enamelled wire emerging from the oven, which station is located downstream of the oven itself. These stations are not shown in the figure and will not be further described as they are not of importance to the ends of the present invention.
  • the oven in question comprises at least one main chamber 2 which is lengthwise passed through by at least one movable wire 3 moving along a predetermined feed direction identifiers by arrows 4. It should be noted that usually the main chamber is simultaneously passed through by several wire portions 3 disposed parallelly to one another. It should be also noted that wire 3 is movable from an inlet opening 5 formed at one end of the main chamber 2 to an outlet opening 6 formed at the other end of said chamber.
  • oven 1 is also comprised of a recirculation duct generally denoted by 7, which has an initial section 8 located close to the inlet opening 5 and in fluid communication with the main chamber 2.
  • the recirculation duct 7 also has an end section 9 which is in fluid communication too with the main chamber 2 close to the outlet opening 6.
  • the recirculation duct 7 extends adjacent to the main chamber 2 and defines a substantially loop-shaped path therewith; in said path, due to the ventilation means 10 and the geometrical conformation of the different ducts, a gas flow is generated which at the main chamber 2 flows in countercurrent relative to the feed direction of the wire 3 so as to facilitate disposal of vapours from the solvent material and a heat exchange with the wire itself.
  • the ventilation means 10 preferably comprises a ventilation member or fan operating at the recirculation duct immediately downstream of the initial section 8.
  • a centre section of the recirculation duct 7 provision is made for a first group of heating resistors 11, a catalytic plate 12 and optionally a second heating resistor group 13 for a fine adjustment of the fluid temperature.
  • An exhaust conduit or stack 14 is also provided and it is arranged to discharge part of the hot fluid resulting from combustion. It is to note that the exhaust conduit 14 too is generally equipped with a respective suction fan, not shown as known and conventional.
  • oven 1 also comprises an auxiliary channel 15 having one end 15a communicating with the recirculation duct 7 and a second end 15b communicating with the main chamber 2.
  • auxiliary channel 15 having one end 15a communicating with the recirculation duct 7 and a second end 15b communicating with the main chamber 2.
  • the first end 15a of duct 15 draws fluid from duct 7 preferably close to the end section 9.
  • the end section 9 of duct 7 has a decreasing area in cross-section as it moves close to the main chamber 2, so that an efficient Venturi effect is achieved and, as a result, a vacuum is created in the main chamber portion included between the outlet opening 6 and said insertion section 16.
  • the end section 9 opens into the main chamber 2 in a direction substantially tangential to, or in any event slightly inclined to the longitudinal extension direction of the main chamber itself.
  • the auxiliary channel 15 has a cross-section of substantially constant area and enters the main chamber 2 at right angles thereto.
  • flow adjusting means 17 comprising at least one valve proportionally operable between a full-closure condition and a full-opening condition so as to substantially offer an infinite number of adjustment possibilities for the flow circulating in the channel 15.
  • the fan 10 operating in the recirculation duct 7 causes an increase in the kinetic energy of the flow made up of air and solvent vapours (see arrows 20). Then said flow encounters the resistor groups 11 and 13 and the catalytic plate 12 where it is fired. The hot flow goes on until it reaches the section of the recirculation duct 7 where the exhaust conduit 14 is provided. At said conduit, due to the presence of a respective suction fan (not shown), part of the hot gases are sucked out. The remaining and predominant portion of the gases reaches the duct end section 9 and the auxiliary recirculation channel 15. At this point, depending on the operating conditions of the adjustment valve 17, different technical effects to be better analyzed in the following can be achieved,
  • the air flow passing through the end section 9 creates a vacuum in the main chamber 2 causing external fresh air to be drawn in through the outlet opening 6.
  • wire 3 moves from the inlet opening 5 to the outlet opening 6 according to the orientation shown by arrows 4, in countercurrent with respect to the gas flow running according to the orientation shown by arrows 20.
  • Said gases pass through the whole main chamber 2 in which a vacuum condition relative to the external environment constantly exists and they are then recalled through the initial section 8 of the recirculation duct.
  • the suction effect not only will produce suction of external fresh air from the outlet opening 6, but will also cause a recall of hot gases from the auxiliary channel 15.
  • the portion of the main chamber 2 included between the auxiliary channel 15 and end section 9 is passed through by a fluid the temperature of which can be adjusted by opening or closing the adjustment valve 17 to a greater or lesser degree, because part of the fluid therein present comes from the auxiliary channel 15.
  • the invention achieves important advantages.
  • the auxiliary channel 15 it is possible to adjust the volume of the air introduced from the opening 6, independently of the amount of the overall fluid processed in the oven.
  • the temperature in the main chamber portion included between the channel 15 and end section 9 can be adjusted too, so that the length of the efficient portion of chamber 2 can be adapted by turns to the different requirements, depending on the types of insulating enamels used for covering the wire 3.
  • the polymerization times can have different durations.
  • the wire on which the covering enamel has already been completely polymerized should not stay any longer at high temperatures, in that this situation would surely damage the integrity of the insulating layer.
  • oven 1 is capable of adapting itself to any necessities as it can each time carry out a temperature adjustment in a portion of the main chamber 2, and of ensuring a great operating flexibility.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Drying Of Solid Materials (AREA)
  • Furnace Charging Or Discharging (AREA)

Claims (7)

  1. Emaillierofen für fadenförmige Materialien, umfassend:
    mindestens eine Hauptkammer (2), die durch mindestens einen beweglichen Faden (3) längs einer vorgegebenen Vorschubrichtung von einer Eintrittsöffnung (5) bis einer Austrittsöffnung (6) der Hauptkammer durchquert wird;
    mindestens eine Rücklaufleitung (7) mit einem Anfangsabschnitt (8), der mit der Hauptkammer (2) nahe der Eintrittsöffnung (5) in fluider Verbindung steht, und einem Endabschnitt, der mit der Hauptkammer (2) nahe der Austrittsöffnung (6) in fluider Verbindung steht;
    Lüftungsmittel (10), um in dieser Hauptkammer (2) einen Luftfluß im Gegenstrom zur Vorschubrichtung des Fadens (3) zu erzeugen;
    und einen Hilfskanal (15),
    dadurch gekennzeichnet, daß der Hilfskanal (15) ein erstes mit der Rücklaufleitung (7) kommunizierendes Ende (15a) und ein zweites Ende (15b) besitzt, das mit der Hauptkammer (2) in einem zwischen der Austrittsöffnung (6) und dem Endabschnitt (7) liegenden Bereich kommuniziert, wobei dem Hilfskanal (15) Durchflußeinstellmittel (17) wirksam zugeordnet sind.
  2. Emaillierofen nach Anspruch 1, dadurch gekennzeichnet, daß das erste Ende (15a) des Hilfskanals (15) das Fluid der Rücklaufleitung (7) im wesentlichen nahe des Endabschnittes (9) der Rücklaufleitung entnimmt.
  3. Emaillierofen nach Anspruch 1, dadurch gekennzeichnet, daß der Hilfskanal (15) einen im wesentlichen konstanten Querschnitt aufweist.
  4. Emaillierofen nach Anspruch 1, dadurch gekennzeichnet, daß das zweite Ende (15b) des Hilfskanals (15) in die Hauptkammer (2) gemäß einer Richtung einmündet, die zur Richtung der Längsabwicklung der Hauptkammer selbst senkrecht steht.
  5. Emaillierofen nach Anspruch 1, dadurch gekennzeichnet, daß die Einstellmittel (17) mindestens ein Ventil umfassen, das proportional zwischen einer vollständigen Schließstellung und einer vollständigen Offenstellung steuerbar ist.
  6. Emaillierofen nach Anspruch 1, dadurch gekennzeichnet, daß der Endabschnitt (9) eine Querschnittsfläche besitzt, die schrittweise unter Annäherung an die Hauptkammer (2) verkleinert wird.
  7. Emaillierofen nach Anspruch 1, dadurch gekennzeichnet, daß die Lüftungsmittel (10) ein Lüftungsorgan umfassen, das im Bereich der Rücklaufleitung (7) wirkt.
EP95830394A 1995-09-26 1995-09-26 Emallierofen für fadenförmige Materialen Expired - Lifetime EP0770842B1 (de)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP95830394A EP0770842B1 (de) 1995-09-26 1995-09-26 Emallierofen für fadenförmige Materialen
AT95830394T ATE178985T1 (de) 1995-09-26 1995-09-26 Emallierofen für fadenförmige materialen
DE69509097T DE69509097T2 (de) 1995-09-26 1995-09-26 Emallierofen für fadenförmige Materialen

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP95830394A EP0770842B1 (de) 1995-09-26 1995-09-26 Emallierofen für fadenförmige Materialen

Publications (2)

Publication Number Publication Date
EP0770842A1 EP0770842A1 (de) 1997-05-02
EP0770842B1 true EP0770842B1 (de) 1999-04-14

Family

ID=8222012

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95830394A Expired - Lifetime EP0770842B1 (de) 1995-09-26 1995-09-26 Emallierofen für fadenförmige Materialen

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EP (1) EP0770842B1 (de)
AT (1) ATE178985T1 (de)
DE (1) DE69509097T2 (de)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102538419B (zh) * 2012-02-20 2014-09-10 张家港市东航机械有限公司 钢丝连续生产加热烘干炉体
CN102564090B (zh) * 2012-02-20 2014-06-18 张家港市东航机械有限公司 钢丝连续生产加热烘干炉
CN102944107A (zh) * 2012-12-03 2013-02-27 张家港市胜达钢绳有限公司 一种胎圈钢丝在线烘干装置及在线烘干方法
AT513628B1 (de) * 2013-04-29 2014-06-15 Cpa Comp Process Automation Gmbh Verfahren und Vorrichtung zum Wärmebehandeln von Langprodukten
FR3037640B1 (fr) * 2015-06-19 2017-06-16 Saint Gobain Isover Etuve de reticulation d'un matelas continu de fibres minerales ou vegetales
CN105241197B (zh) * 2015-09-30 2019-05-24 扬州金辰不锈钢制造有限公司 一种高效钢丝在线烘箱
CN106017022B (zh) * 2016-07-14 2018-11-09 江门市智睿包装机械有限公司 干式印刷复合机的高效节能干燥系统

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3183605A (en) * 1961-12-27 1965-05-18 Gen Electric Apparatus for coating metals
IT210434Z2 (it) * 1987-01-30 1988-12-30 S I C M E S P C Societa Ind Co Forno per la cottura di manufatti filiformi

Also Published As

Publication number Publication date
ATE178985T1 (de) 1999-04-15
EP0770842A1 (de) 1997-05-02
DE69509097T2 (de) 1999-11-18
DE69509097D1 (de) 1999-05-20

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