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
• • 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
  • F24C15/325—Arrangements of ducts for hot gases, e.g. in or around baking ovens with forced circulation electrically-heated

Definitions

• the present invention relates to electric ovens, particularly domestic ovens having a water container and equipped with steam cooking function.
• the cooking process is conducted with the electric heaters mounted inside the cavity.
• the casing is equipped with a steam generator and the steam generator feed steam to the cooking chamber. Steam generators are procured as a pre-assembled component and therefore increases the production cost of the oven.
• Another embodiment for providing steam is use of an evaporation tray within the cavity.
• a wide tray is disposed at the base of the cavity and during cooking process, the water filling in the tray evaporates by the high temperature in the cooking chamber. Since the evaporation tray area is limited to the cavity base, sufficient amount of steam cannot be obtained from the tray for steam assisted cooking process in standard size ovens.
• EP3372900A1 discloses convection oven includes a convection fan assembly and a trough assembly that surrounds a portion of the heating element of the convection fan assembly. Fluid in the trough assembly is heated and turned into steam by the heating element and blown into the cooking cavity of the convection oven by the convection fan of the convection fan assembly. The steam in the cooking cavity provides moisture to the items that are being cooked and/or heated in the cooking cavity.
• an electric oven comprising a cavity surrounding a cooking chamber accessible through an opening; an electric heating element secured inside the cavity and a liquid container provided on the outer side of the cavity; a steam generator having a transmission tube which is hermetically connected to the liquid container from a proximal end to supply liquid and extends on an opposite distal end to penetrate into the inner part of the cavity from an opening.
• Electric oven further comprising a distribution part which is extended at least partially adjacent to the electric heating element from the distal end of the transmission tube and has at least one outlet opening thereon allowing for the steam ejection.
• the invention also includes a distribution part which is extended at least partially adjacent to the electric heating element from the second end of the transmission tube and has at least one outlet opening thereon allowing for the steam ejection.
• Metal distribution part allows the liquid, for example the drinking water it carries inside to be distributed to the part of the cavity facing inwards by evaporating during the discharge inside the distribution part or from the outlet opening since it is adjacent to the electric heating element. In this way, in cases where the electric heating element in the cavity is operating, the liquid delivered to the distribution part from the second end of the transmission tube, is provided to form steam support during cooking.
• the volume of the liquid container determines the amount of liquid passing through the transmission tube and thus the amount of steam created in the cavity.
• a preferred embodiment of the invention includes an inlet elbow which is formed by being bended towards the cavity from the remote end to provide that the distribution part extends proximal to the cavity.
• the distribution part extending proximal to the cavity creates a flat structure in the cavity and occupies the cooking chamber to a minimum extent.
• the inlet elbow is an L elbow.
• the second end it is possible for the second end to enter into the cavity perpendicularly from its outer part and to change direction such that the distribution part extends parallel to the inner part of the cavity.
• the L-shaped elbow may be angular or rounded.
• transmission tube and distribution part are uniform. In this way, it is received into the cavity with being turned from the second end by the elbow.
• the transmission tube and the distribution part can be also formed as two separate tubes connected to each other from the second end by the elbow.
• a preferred embodiment of the invention includes a mounting element having a guide hole provided in the cavity and through which the distribution part passes to directly support the inlet elbow against the weight of the distribution part.
• the mounting element is in the plate form.
• the distribution part is a thin tube made of metal. The mounting plate prevents forming of any torsional load on the cavity with the moment it will create due to the weight of the metal distribution part and directly carries the distributor extension thereon.
• the mounting element includes a corresponding first hole and a second hole of the electric heating element through which an inlet and outlet end pass that extends from the part facing inwards to the part facing outwards of the cavity by being adjacent to the guide hole.
• the mounting element both carries the distribution part of the liquid transmission tube and has holes allowing the terminal connections of the electric heating element to pass out of the cavity.
• the mounting element eliminates the risk of damage that the process of drilling holes proximal to each other in the cavity might create, by means of a plate structure collecting thereon a plurality of functional holes on the cavity.
• the mounting element is secured to the cavity in the form of a plate longitudinally covering the opening. Thereby, the mounting element prevents the heat leakage by covering the cavity.
• a preferred embodiment of the invention includes a metal bracket which is secured to the distribution part from one end and to the electric heating element from the other end in a way to keep the distribution part and the electric heating element close each other.
• the metal bracket both guarantees the proximal position of the distribution part to the electric heating element at high temperatures due to its resistance to thermal stresses, and accelerates the evaporation of the liquid in the metal distribution part when the electric heating element operates by transferring heat from the electrical resistance by conduction.
• the outlet opening is in the form of a slit opened on the lateral wall of the distribution part. In this way, a structure similar to diffuser is obtained, allowing liquid/steam to escape through the tubular distribution part.
• the electric heating element comprises a ring part extending substantially parallel to the cavity and the distribution part has a curvilinear form following the ring part. In this way, it is possible to extend both the electric heating element in the cavity and the distribution part in the cavity by occupying the cooking chamber volume at least.
• the liquid container includes a liquid inlet that is disposed from the front part and provided on the body from the part facing the opening. In this way, user of the oven can carry out liquid feeding by accessing the liquid container from the front of the oven.
• the liquid container may be a tank structure that is drawn out through the liquid inlet or directly supplied with liquid.
• a preferred embodiment of the invention includes a control valve which is disposed to provide liquid passage selectively between the transmission tube and the liquid container and provides liquid passage to transmit the liquid in the liquid container to the transmission tube in a steam assistance mode.
• the control valve prevents the passage of liquid from the transmission tube in cases where the oven does not operate or the cooking chamber does not reach the evaporation temperature.
• the control valve in conjunction with a control unit of the oven, allows the liquid to be transmitted from the liquid container to the transmission tube at a predetermined time and/or flow rate in a cooking program that needs steam cooking assistance.
• the valve is equipped with a pump to transmit the liquid from the liquid container to the transmission tube under pressure.
• the liquid container is disposed above the cavity in a way that cavity remains at the bottom. In this way, the potential energy of the liquid in the liquid container is utilized and the liquid is transferred to the transmission tube under hydrostatic pressure, allowing the liquid to move towards the cavity by itself.
• the opening is provided on the rear wall of the cavity.
• the distribution part does not prevent the advancing of accessories such as trays and grills to be disposed in the cooking chamber. Opening on the rear wall ensures that the distribution part passes from the outer part of the cavity to the inner part and a compact steam generator for the oven is obtained.
• a preferred embodiment of the invention includes a convection fan mounted on the rear wall such that a fan thereof remains in the part of the cavity facing inwards.
• the convection fan allows for the circulation of the steam supplied to the inner part of the cavity by the distribution part provided on the rear wall, in the cooking chamber.
• the heating element and the distribution part is disposed coaxial with the fan and the part of the cavity facing inwards includes a baffle covering the fan at a distance by providing thereon at least one circulation opening.
• a baffle covering the fan at a distance by providing thereon at least one circulation opening.
• Figure 1 is a rear perspective view of a representative embodiment of the electrical oven according to the invention, with the steam supply device adapted to the heating element.
• FIG 2 is an enlarged partial view of the steam supply assembly shown in Figure 1 in the mounting condition on the electric heating element.
• Figure 3 is a mounting view of the steam supply assembly with the convection fan.
• Figure 4 is the front view of a representative embodiment of the electrical oven according to the invention, with the fan protection sheet and convection fan removed.
• Figure 5 is a front view of the electrical oven shown in Figure 4 with the convection fan mounted.
• a body (10) of the oven includes an upper panel (12) and a flange (14) disposed below it.
• the flange (14) surrounds a opening (15).
• a hinged door (not shown) covers the opening (15) in an openable manner.
• the opening (15) surrounds a cooking chamber surrounded by a cavity (20) in the body (10).
• the cavity (20) is obtained by joining the metal plates to each other by means of welding seam.
• the heat-resistant coated metal plates include a ceiling (22), a base (27) which are secured to each other and a rear wall (24) extending perpendicularly to their rear edges, and opposing side walls (26) provided between them perpendicularly.
• the front part of the cavity (20) is open to reach the opening (15).
• a liquid inlet (17) is disposed on the top panel (12).
• a steam generator (40) is mounted to the body (10) from the front, with a liquid container (41).
• the fluid reservoir (41) has a hollow elongated structure and is connected at a proximal end (43) of a transmission tube (44) that provides liquid delivery from its rear end to a control valve (42).
• the transmission tube (44) extends parallel to the ceiling (22) at a first end 43 until it partially passes the rear wall (24) at the exit of the control valve (42), then is rotated towards the rear wall (24) by an L-like elbow (45).
• the rear wall (24) is shown representatively in Figure 1 as transparent.
• a second end (47) of the transmission tube (44) reaching the rear wall (24) is rotated perpendicularly towards the rear wall (24) by an elbow.
• An opening (28) is formed in the rear wall (24) at a distance from the upper edge of the rear wall (24) close to the ceiling (22).
• the opening (28) is obtained by cutting the rear wall (24) in the form of a transverse large rectangle.
• a mounting element (60) adapts the steam generator (40) to the rear wall (24).
• a fixing plate (64) of the mounting element (60) is a flat metal plate covering the opening (28) and allows the second end (47) to pass through the opening (28) from the outer part to the inner part of the rear wall (24) of the cavity (20).
• the mounting element (60) also allows an electric heating element (30) to be adapted to the rear wall (24).
• a convection fan (50) with a motor 52 and a fan (54) secured to the shaft is mounted at the center of the rear wall (24).
• the motor (52) is disposed on the part of the rear wall (24) facing outwards and the fan (54) is disposed on the part of the motor (52) on the shaft end rotatably facing inwards.
• the mounting element (60) which is secured to cover the opening (28) by means of a pin (61) on the rear wall (24) and a ring portion (32) of the electric heating element (30) with the distributor extension (46) of the transmission tube (44) directed to the rear wall (24) with the inlet elbow (49) in the continuation of the second end (47) are shown enlarged by being partially taken.
• the mounting element (60) completely covers the opening (28) by resting against the outer part of the rear wall (24), by means of the fixing plate (64) in a strip structure made of metal material that is resistant to high temperatures (for example, such as 250°C) to which the rear wall (24) is exposed.
• a pin (61) is disposed in the holes at the opposite ends of the fixing plate (64), hermetically covering the opening (28).
• An inlet end (31) and an outlet end (34) having a suitable diameter of the electrical resistance (30) pass from their corresponding ends through a first hole (63) and a second hole (65) at a distance with each other that are longitudinally drilled on the fixing plate (64).
• a guide hole (66) is drilled in the fixing plate (64) adjacent the second hole (65). The diameter of the guide hole (66) is equal to the outer diameter of the transmission tube (44), and the second end (47) of the transmission tube (44) is disposed into the guide hole (66) with an inlet elbow (49) supported directly from the guide hole (66).
• the inlet elbow (49) has L form.
• the inlet elbow (49) allows the second end (47) running perpendicular to the outer part of the rear wall (24) to define a distribution part (46) by rotating adjacent and parallel on the inside of the rear wall (24).
• the inlet elbow (49) carries the weight of the distribution part (46) directly in the guide hole (66) where it fits.
• the distribution part (46) is the extension of the second end (47) in the inner part of the cavity (20).
• the electrical connection of the heating element (30) comes from the mains connection (not shown) to which the inlet end (31) and the outlet end (34) are electrically connected in the outer part of the cavity (20).
• the heating element (30) extends in a two-turn ring part (32) between the inlet end (31) and the outlet end (34) passing through the mounting element (60) close to each other.
• the distribution part (46) forms a concentric circular arc in the upper part of the ring (32) and at a distance therefrom, which is compatible with the outer diameter of the ring section (32).
• the circular arc of the distribution part (46) is approximately 15° with respect to the center of the ring part (32).
• the distribution part (46) has an inner part (462) facing the outer periphery of the ring part (32) between a proximal part (463) that is a continuation of the inlet elbow (49) and a distal part (464).
• the inner part (462) is close but at a distance from the ring portion (32) so as to define an evaporation portion (35) from its corresponding portion.
• the distance is provided by a bracket (70) that extends from one end of the evaporation portion (35) to the distal part (464) from the other end.
• the bracket (70) is made of a metal with low heat conductivity.
• the distribution part (46) supplies steam to the outlet openings (461) in the form of sequential slits opening thereon towards the inner part (462) facing the evaporation portion (35) and to the inner part of the cavity (20) disposed on the expanded free end (48).
• FIG 3 the components that enable the steam generator (40) to supply steam to the oven are shown in perspective from the rear without the cavity (20).
• the liquid container (41) is filled with water, as required by the user.
• the control element opens the control valve (42) and ensures that the water coming from the first end (43) from the liquid container (41) is pressurized by the control valve (42) and fills the transmission tube (44).
• the water passing through the control valve (42) moves towards the rear wall (24) parallel to and at a distance from the ceiling (22) and is directed downwards by the elbow (45) and carried to the opening (28) of the rear wall (24).
• the water reaching the second end (47) is transmitted from the outer part to the rear wall (24) with being perpendicular to the elbow and passed over the fixing plate (64).
• the fixing plate (64) also allows the heating element (30) to pass through the opposite inlet end (31) and the output end (34) to the corresponding first hole (63) and the second hole (65) from the ring part (32).
• the second end (47) that fits into the guide hole (66) from the inlet elbow (49) forms in the continuation the distribution part (46) with its free end (48) facing down to follow adjacently the ring part (32).
• the rotation center of the motor (52) of the convection fan (50) is adjusted coaxially with the circle center of the ring part (32).
• the part of the steam generator (40) that passes into the rear wall (24) is only the distribution part (46) that rests against the fixing plate (64) of the inlet elbow (49).
• the mounting element (60) is disposed in the opening (28) and the pins (61) are mounted on the rear wall (24). In this way, only the heating element (30) and the distribution part (46) disposed thereon reach the part of the rear wall (24) facing the cooking chamber.
• the outlet openings (461) are arranged to face radially inwards in the inner part (462).
• the oven is shown from the front and with the fan (54) mounted on the rear wall (24).
• the fan (54) is disposed in the middle center of the rear wall (24).
• a baffle (80) which acts as a protection sheet is disposed in front of the fan (54) at a distance.
• the circulation opening (82) is formed with spacing between the edges of the baffle (80).
• the oven blocks the transmission tube (44) of the control valve (42) in case that it is not operating, there is no liquid in the liquid container (41) and it is not taken into the steam assisted operation mode. In case that steam assistance is required, the control valve (42) allows water passage.
• water supplied from the liquid container (41) above thereof at a distance to the upper part of the cavity (20) is carried to the rear wall (24) by transmission tube (44) and taken to the distribution part (46).
• the heating element (30) is operating or in a hot condition
• the water evaporated at the metal distribution part (46) advances radially inwards from the outlet opening (461) and reaches to the fan (54).
• the fan (54) distributes the steam from circulation openings (82) to the cooking chamber.
• Heating element 60 Mounting element Inlet end 61 Pin Ring part 63 First hole Outlet end 64 Fixing plate Evaporation portion 65 Second hole Steam generator 66 Guide hole Liquid container 70 Bracket Control valve 80 Baffle First end 82 Circulation opening Transmission tube Elbow

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• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Cookers (AREA)

Applications Claiming Priority (1)

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• 2020
  • 2020-06-02 WO PCT/TR2020/050480 patent/WO2021246975A1/en not_active Ceased
  • 2020-06-02 EP EP20938695.2A patent/EP4158254A4/de active Pending

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