EP0834703B1 - Dampfofen mit erzwungener Konvektion - Google Patents

Dampfofen mit erzwungener Konvektion Download PDF

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Publication number
EP0834703B1
EP0834703B1 EP97420184A EP97420184A EP0834703B1 EP 0834703 B1 EP0834703 B1 EP 0834703B1 EP 97420184 A EP97420184 A EP 97420184A EP 97420184 A EP97420184 A EP 97420184A EP 0834703 B1 EP0834703 B1 EP 0834703B1
Authority
EP
European Patent Office
Prior art keywords
water
pipe
oven
inlet pipe
storage tank
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
EP97420184A
Other languages
English (en)
French (fr)
Other versions
EP0834703A1 (de
Inventor
Raymond Violi
Laurent Personnettaz
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.)
Societe Cooperative de Production Bourgeois SCOP
Original Assignee
Societe Cooperative de Production Bourgeois SCOP
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 Societe Cooperative de Production Bourgeois SCOP filed Critical Societe Cooperative de Production Bourgeois SCOP
Publication of EP0834703A1 publication Critical patent/EP0834703A1/de
Application granted granted Critical
Publication of EP0834703B1 publication Critical patent/EP0834703B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C15/00—Details
    • F24C15/32—Arrangements of ducts for hot gases, e.g. in or around baking ovens
    • F24C15/322—Arrangements of ducts for hot gases, e.g. in or around baking ovens with forced circulation
    • F24C15/327—Arrangements of ducts for hot gases, e.g. in or around baking ovens with forced circulation with air moisturising

Definitions

  • the present invention relates to steam ovens and forced convection, in which a cooking chamber contains a turbine which circulates air by passing it over heating elements downstream of the turbine, with a device for generating steam. to produce steam introduced into the cooking chamber.
  • Document DE 41 31 748 A describes a forced convection steam oven in which steam is produced by spraying water on the heating elements.
  • the document EP-A-0 383 366 also describes a steam oven and forced convection.
  • the document expresses the problem of obtaining a regular and constant vaporization.
  • the previous solutions mentioned consist in injecting water under great pressure.
  • the solution taught by this document consists in providing a regulator, inserted upstream in the water supply pipe, and which is adjusted so that the water flows without pressure at the outlet of the pipe. above the turbine hub. For this, the regulator must be adjusted according to the water pressure upstream of the regulator. It is found that such a solution does not provide sufficient regularity for the production of steam in the oven.
  • the present invention results from the observation that the operating faults result from variations in the water supply pressure, producing excessively large variations in the flow rate of water projected onto the heating elements. Too much water leads to a flow of unvaporized water. Too low a water flow leads to insufficient steam.
  • the problem proposed by the present invention is to design a steam oven and forced convection in which the production of steam is satisfactorily controlled, whatever the water supply conditions, and in particular the pressure conditions of the water in the water supply source, so as to create consistent and satisfactory conditions for spraying and spraying water.
  • the invention provides the features of the characterizing part of claim 1.
  • Such a structure of a water flow control device is particularly advantageous, simple and inexpensive to manufacture, reliable, and effective.
  • the overflow pipe leads the excess water into a water discharge pipe from the oven enclosure.
  • the overflow of water is thus used to cool the condensation water leaving the oven.
  • a device for regulating the flow of water which further comprises a pressure equalization pipe, comprising an upstream part in a siphon communicating with the lower zone of the tank, and connected downstream to an outlet pipe. steam from the oven. In this way, the water flow for the production of steam is independent of the pressure prevailing inside the oven.
  • the spraying means is a drilled cone, mounted axially at the end of the rotation shaft of the turbine.
  • the turbine comprises a flange perpendicular to its rotation shaft and carrying fins projecting from the anterior face of the flange, the spray cone being fixed in the center of the anterior face of the flange with its apex directed towards the flange, l '' inlet pipe outlet orifice directing water radially on the lateral surface of the spray cone.
  • the oven comprises an enclosure 1 limited by a muffle 2, the opening 3 of which is closed by a door 4.
  • An air circulation turbine 5 is placed in the enclosure 1 in the vicinity of the rear wall 6 of the muffle 2.
  • the air circulation turbine 5 shown in the figure comprises a flange 7, generally parallel to the rear wall 6 and mounted at the end of a rotation shaft 8 itself driven in rotation by an electric motor 9.
  • the flange 7 carries fins 10 projecting from the front face 11 of the flange 7.
  • a spray cone 12 is fixed to the center of the front face 11 of the flange 7, with its apex directed towards the flange 7.
  • the spray cone 12 is pierced with holes such as hole 13, and is mounted axially at the end of the rotation shaft 8 of the turbine 5.
  • An inlet pipe 14 makes it possible to conduct water from a water supply source 15, such as the public drinking water supply network, to an outlet orifice 16 disposed in the enclosure 1 and adapted to direct a jet of water radially onto the lateral surface of the spray cone 12.
  • a water supply source 15 such as the public drinking water supply network
  • the spray cone I2 projects the water onto the fins 10 of the air circulation turbine 5 which itself projects the water onto heating elements 17 such as electrical resistors placed on the periphery of the turbine 5, c ' that is to say downstream of the turbine 5 in the direction of air circulation.
  • the invention provides for incorporating a water flow control device 18, producing a water flow independent of the water pressure in the water supply source 15 to the inlet of the inlet pipe 14.
  • the water flow control device 18 comprises a sealed reservoir 19, disposed at a level higher than that of the outlet orifice 16.
  • An upstream section 20 of inlet pipe 14 is provided with a solenoid valve 21 controlled by a timed control 22 ensuring the intermittent opening of the solenoid valve 21 according to a determined cycle.
  • the upstream section 20 of inlet pipe 14 is connected upstream to the water supply source 15, and is connected downstream to the sealed tank 19.
  • a downstream section 23 of inlet pipe 14 is adapted to conduct the water from the tank 19 to the outlet orifice 16.
  • An overflow line 24 is adapted to evacuate the water contained in the tank 19 beyond a determined maximum level 25.
  • the overflow line 24 leads the excess of water in a water evacuation pipe 26 ensuring the evacuation of the condensation water from a lower orifice 27 formed in the lower wall 28 of the muffle 2.
  • the overflow line 24 descends from the tank 19, and its inlet orifice is located at the determined maximum level 25.
  • a tubular inlet portion of the overflow line 24 enters the tank 19 through an opening in its lower wall, up to level 25.
  • the water evacuation pipe 26 can, for example, conduct the condensation water to a condensation box 29, the outlet 30 of which is connected to the waste water evacuation pipes, preferably by a siphon.
  • a steam outlet pipe 31 is connected to the enclosure 1 by an upper orifice 32 formed in the upper wall 33 of the muffle 2.
  • the steam outlet pipe 31 is provided with a catalyst 34 and its downstream outlet 35 is connected to the condensation box 29.
  • a vent pipe 36 is connected at the top of the tank 19.
  • the vent pipe 36 can advantageously comprise a valve 136, arranged so as to allow the outlet of the gases to the atmosphere but preventing the outlet of water to the outside of the tank 19.
  • vent pipe 36 may include a calibrated leak, allowing the calibrated opening of the vent pipe 36.
  • the downstream section 23 of the inlet pipe 14 may advantageously comprise a device for calibrating the water flow 37, placed at the outlet of the tank 19.
  • the water flow regulation device 18 further comprises a pressure equalization pipe 38, comprising an upstream part 39 in a siphon communicating with the lower zone of the tank 19, and connected downstream to the steam outlet pipe 31 of the furnace, preferably downstream of the catalyst 34.
  • the timed control 22 can advantageously be adjusted to ensure the intermittent opening of the solenoid valve 21 according to a cycle ensuring a continuous presence of water in the tank 19, and an intermittent flow of water in the overflow pipe 24. A continuous projection of water is thus produced through the outlet orifice 16 on the projection cone 12, and a regular production of vapor inside the enclosure 1.
  • FIG. 2 illustrates the operation of the water flow regulation device 18.
  • Curve a illustrates the temporal variation of the supply water flow rate in the upstream section 20 of the inlet pipe, with a constant flow rate D between the times t1 and t2, corresponding to the open state of the solenoid valve 21 , and a zero flow between times t2 and t3 corresponding to the closed state of the solenoid valve 21.
  • Curve b) illustrates the temporal variation of the water level in the reservoir 19. From a minimum level m not zero at time t1, the level increases to the determined maximum 25 reached at time t4 prior to t2, then remains constant until t2 then decreases regularly to the minimum at time t3.
  • Curve c) illustrates the temporal variation of the water flow in the overflow pipe 24.
  • a water flow is present between times t4 and t2.
  • Curve d illustrates the constant water flow d in the downstream section 23 of inlet pipe 14.
  • durations t2- t1 and t3- t1 to respect the permanent presence of water in the tank 19 and the production of an intermittent flow in the overflow pipe 24. These durations will be preset in the factory.
  • the flow rate D is modified. This results in a modification of the instant t4, and therefore a modification of the flow time in the overflow pipe 24, without altering the water flow d in the downstream section 23 of the inlet pipe 14.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Turbines (AREA)
  • Cookers (AREA)
  • Nozzles (AREA)
  • Devices For Medical Bathing And Washing (AREA)
  • Air Humidification (AREA)

Claims (10)

  1. Dampfofen mit erzwungener Konvektion, mit einem Raum (1) für eine Umluftturbine (5) mit Heizelementen (17) stromabwärts der Umluftturbine (5), einem Eintritts-Rohrleitungssystem (14) zum Leiten von Wasser von einer Wasserversorgungsquelle (15) bis zu einer Austrittsdüse (16), die in dem Raum (1) angeordnet ist, um einen Wasserstrahl auf eine Zerstäubungseinrichtung (12) zu leiten, der das zerstäubte Wasser auf die Schaufeln (10) der Umluftturbine (5) leitet, dadurch gekennzeichnet, daß der Ofen zusätzlich eine Regeleinrichtung (18) für den Wasserausstoß mit einem Reservoir (19) aufweist, das in das Eintritts-Rohrleitungssystem (14) eingefügt ist und auf einem Niveau oberhalb der Austrittsdüse (16) angeordnet ist,und einen Wasserausstoß unabhängig vom Wasserdruck der Wasserversorgungsquelle (15) am Eingang des Eintritts-Rohrleitungssystems (14) erzeugt.
  2. Ofen nach Anspruch 1, dadurch gekennzeichnet, daß die Regeleinrichtung (18) für den Wasserausstoß folgendes aufweist:
    - ein Teilstück (20) oberhalb des Eintritts-Rohrleitungssystems (14) ist mit einem Elektroventil (21) ausgestattet, das von einer Verzögerungssteuerung (22) gesteuert wird, die ein intermittierendes Öffnen des Elektroventils (21) nach einem vorbestimmten Zyklus sicherstellt, und stromaufwärts der Wasserversorgungsquelle (15) und stromabwärts des Reservoirs (19) angeschlossen ist,
    - ein Teilstück (23) stromabwärts des Eintritts-Rohrleitungssystems (14), das zum Leiten von Wasser aus dem Reservoir (19) bis zur Austrittsdüse (16) angepaßt ist,
    - eine Rohrleitung (36) zum Ablassen von freier Luft, die an einem oberen Teil des Reservoirs (19) angeschlossen ist,
    - ein Überlaufrohr (24) zum Ablassen von in dem Reservoir (19) oberhalb eines vorbestimmten maximalen Niveaus (25) enthaltenen Wassers.
  3. Ofen nach Anspruch 2, dadurch gekennzeichnet, daß das Überlaufrohr (24) überschüssiges Wasser in ein Wasserablaufrohr (26) des Raumes (1) des Ofens leitet.
  4. Ofen nach einem der Ansprüche 2 oder 3, dadurch gekennzeichnet, daß das Teilstück (23) stromabwärts des Eintritts-Rohrleitungssystems (14) eine Einrichtung (37) zum Einstellen des Wasserausstoßes aufweist, die am Ausgang des Reservoirs (19) angeordnet ist.
  5. Ofen nach irgendeinem der Ansprüche 2 bis 4, dadurch gekennzeichnet, daß die Einrichtung (18) zum Regeln des Wasserausstoßes zusätzlich ein Druckausgleichsrohr (38) aufweist, das einen stromaufwärtigen Teil (39) in Form eines Siphons aufweist, das mit der unteren Zone des Reservoirs (19) in Verbindung steht, und stromabwärts an eine Rohrleitung (31) zum Abführen von Dampf aus dem Ofen angeschlossen ist.
  6. Ofen nach Anspruch 5, dadurch gekennzeichnet, daß die Rohrleitung (31) zur Abfuhr von Dampf aus dem Ofen mit einem Katalysator (34) ausgestattet ist, und daß das Druckausgleichsrohr (38) an die Rohrleitung (31) zur Abfuhr von Dampf aus dem Ofen stromabwärts des Katalysators (34) angeschlossen ist.
  7. Ofen nach irgendeinem der Ansprüche 2 bis 6, dadurch gekennzeichnet, daß die Abluftleitung (36) für freie Luft eine Rückschlagklappe (136) enthält, die einen Austritt des Gases zur Atmosphäre gestattet, jedoch den Austritt von Wasser aus dem Reservoir (19) verhindert.
  8. Ofen nach irgendeinem der Ansprüche 2 bis 7, dadurch gekennzeichnet, daß die Abluftleitung (36) für freie Luft eine einstellbare Öffnung aufweist.
  9. Ofen nach irgendeinem der Ansprüche 1 bis 8, dadurch gekennzeichnet, daß die Zerstäubungseinrichtung (12) ein durchlöcherter Konus ist, der axial an ein Ende der Drehwelle (8) der Turbine (5) angebracht ist.
  10. Ofen nach Anspruch 9, dadurch gekennzeichnet, daß die Turbine (5) ein Lagerschild (7) aufweist, das senkrecht zu ihrer Drehwelle (8) steht, und Schaufeln (10), die über die vordere Fläche (11) des Lagerschildes (7) vorstehen, wobei der Zerstäubungskonus (12) an der Mitte der vorderen Fläche (11) des Lagerschildes (7) befestigt ist, wobei seine Spitze in Richtung zum Lagerschild (7) zeigt, und die Austrittsdüse (16) des Eintritts-Rohrleitungssystems (14) Wasser radial gegen die Seitenfläche des Zerstäubungskonus (12) richtet.
EP97420184A 1996-10-07 1997-10-03 Dampfofen mit erzwungener Konvektion Expired - Lifetime EP0834703B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9612471A FR2754334B1 (fr) 1996-10-07 1996-10-07 Four a vapeur et convexion forcee
FR9612471 1996-10-07

Publications (2)

Publication Number Publication Date
EP0834703A1 EP0834703A1 (de) 1998-04-08
EP0834703B1 true EP0834703B1 (de) 2004-03-31

Family

ID=9496608

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97420184A Expired - Lifetime EP0834703B1 (de) 1996-10-07 1997-10-03 Dampfofen mit erzwungener Konvektion

Country Status (5)

Country Link
US (1) US5768982A (de)
EP (1) EP0834703B1 (de)
AT (1) ATE263342T1 (de)
DE (1) DE69728342T2 (de)
FR (1) FR2754334B1 (de)

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Also Published As

Publication number Publication date
FR2754334B1 (fr) 1998-12-18
EP0834703A1 (de) 1998-04-08
ATE263342T1 (de) 2004-04-15
US5768982A (en) 1998-06-23
DE69728342T2 (de) 2004-12-30
DE69728342D1 (de) 2004-05-06
FR2754334A1 (fr) 1998-04-10

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