TR2022017267T2 - OVEN WITH STEAM SUPPORT DEVICE - Google Patents

Abstract

The invention consists of a cavity (20) surrounding a cooking chamber accessible from one opening (15); An electrical resistance (30) fixed in the inward-facing part of the cavity (20) and a liquid tank (41) provided in the outward-facing part of the cavity (20) are connected to a hermetically connected and opposing device that supplies liquid to the liquid tank (41) from a proximal end (43). It relates to an electric oven containing a steam support device (40) with a transport pipe (44) extending from its far end (47) through an opening (28) to the interior of the cavity (20). The electric oven includes a metal distribution extension (46) that is extended at least partially adjacent to the electrical resistance (30) from the far end (47) of the transport pipe (44) and has at least one outlet opening (461) that allows steam passage.

Description

DESCRIPTION OVEN WITH STEAM SUPPORT TECHNICAL FIELD The present invention relates to electric ovens, in particular household type ovens, which have a water tank and provide steam assisted cooking. KNOWN STATE OF THE ART: In electric ovens, which are located in a body and have a cavity in which a cooking chamber surrounded by an openable door can be accessed, the cooking process is carried out with resistances placed inside the cavity. The body is equipped with a steam generator to provide steam support for humidification during the cooking process, and the steam generator provides steam transmission to supply ready steam to the cooking room. Steam generators are supplied as an external component and this increases the cost of furnace production. A different application to provide steam support is the use of an evaporation tray within the cavity. A large tray is placed at the bottom of the cavity, and during cooking, the high temperature in the cooking chamber causes the water filled in the tray to evaporate. Since the evaporation tray area is limited by the cavity floor, sufficient evaporation cannot be achieved from the tray for steam-assisted cooking in ovens with standard dimensions. Publication EP3372900A1 discloses a convection oven including a convection fan assembly and a trough assembly surrounding a portion of the heating elements of the convection fan assembly. The liquid in the trough assembly is heated by the heating elements and converted into steam and is blown into the cooking cavity by a fan of the convection fan assembly. The steam in the cooking cavity provides moisture to the elements heated and/or cooked in the cooking cavity. BRIEF DESCRIPTION OF THE INVENTION The purpose of the invention is to produce sufficient steam for steam cooking in the electric oven cavity with a simple steam device, without an external steam generator. In order to achieve the mentioned purposes, the invention includes a cavity surrounding a cooking chamber accessible from one mouth; an electrical resistance fixed in the inward-facing part of the cavity and a liquid tank provided in the outward-facing part of the cavity, a steam pipe having a transmission pipe which is hermetically connected at a first end to supply liquid to the liquid tank and at a second end, passing through an opening thereon to the interior of the cavity. It includes an electric oven with support equipment. The invention also includes a metal distribution extension that is extended at least partially adjacent to the electrical resistance from the second end of the transmission pipe and has at least one outlet opening that allows steam passage. Since the metal distribution extension is adjacent to the electrical resistance, it allows the liquid it carries, such as drinking water, to evaporate within the distribution extension or during discharge from the outlet opening and spread to the inward-facing part of the cavity. In this way, when the electrical resistance inside the cavity operates, the liquid transmitted to the distribution extension from the second end of the transport pipe is ensured to create steam support during cooking. The volume of the liquid tank determines the amount of liquid passing through the transport pipe and therefore the amount of vapor created in the cavity. A preferred embodiment of the invention includes an entry elbow formed by bending from the second end towards the cavity, allowing the distribution extension to extend close to the cavity. The distribution extension extending close to the cavity creates a flat structure within the cavity and occupies the cooking chamber to a minimum. In a preferred embodiment of the invention, the inlet elbow is an L elbow. In this case, it is possible for the second end to enter the cavity perpendicularly from the outside and the distribution extension to change direction so that it extends parallel to the interior of the cavity. In possible embodiments, the L-shaped elbow may be angular or rounded. In a preferred embodiment, the transmission pipe and the distribution extension are a single piece. In this way, it is taken into the cavity by turning it from the second end with the elbow. In an alternative embodiment, the transmission pipe and the distribution extension can be formed as two separate pipes connected to each other with an elbow at the second end. A preferred embodiment of the invention includes a mounting element provided in the cavity and having a guide hole through which the distribution extension passes, so as to directly support the input elbow against the weight of the distribution extension. The mounting element is in plate form in one possible embodiment. The distribution extension is a thin pipe made of metal. The mounting plate prevents the metal distribution extension from creating any torsional load on the cavity due to the moment it creates due to its weight, and carries the distribution extension directly on it. In a preferred embodiment of the invention, the mounting element includes a corresponding first hole and a second hole through which an inlet and outlet end of the electrical resistance extending from the inward-facing part of the cavity to the outward-facing part passes, adjacent to the guide hole. In this way, the mounting element both carries the distribution extension of the liquid transfer pipe and has holes that will allow the terminal connections of the electrical resistance to pass outside the cavity. Preferably, the mounting element has a plate structure that collects many functional holes on the cavity, eliminating the risk of damage that may be caused by drilling holes close to each other in the cavity. In a preferred embodiment of the invention, the mounting element is fixed to the cavity in the form of a plate that covers the opening from end to end. In this way, the mounting element covers the cavity and prevents heat escape. A preferred embodiment of the invention includes a metal bracket that is fixed to the distribution extension from one end and to the electrical resistance from the other end, keeping the distribution extension and the electrical resistance close to each other. The metal bracket not only guarantees the position of the distribution extension close to the electrical resistance at high temperatures, thanks to its resistance to thermal stresses, but also accelerates the evaporation of the liquid in the metal distribution extension when the electrical resistance operates by transferring heat from the electrical resistance by conduction. In a preferred embodiment of the invention, the exit opening is in the form of a slit opened in the lateral wall of the distribution extension. In this way, a diffuser-like structure is obtained and liquid/vapor exit is allowed along the pipe-shaped distribution extension. In a preferred embodiment of the invention, the electrical resistance includes a ring section extending substantially parallel to the cavity, and the distribution extension has a curvilinear form following the ring section. In this way, it is possible to extend both the electrical resistance inside the cavity and the distribution extension further while occupying the cooking chamber volume as little as possible. In a preferred embodiment of the invention, the liquid tank is located from a front part and includes a liquid loading opening provided in the body from the side facing the mouth. In this way, the oven user can access the liquid tank from the front of the oven and feed liquid. In possible embodiments, the liquid tank may be in the form of a tank whose liquid is withdrawn from the loading opening or directly fed with liquid. A preferred embodiment of the invention includes a control valve that is placed between the transport pipe and the liquid tank in a way that allows liquid passage selectively, and in a steam support mode, which provides liquid passage by transporting the liquid in the liquid tank to the transport pipe. The control valve prevents liquid from passing through the transport pipe when the oven is not operating or the cooking chamber does not reach the evaporation temperature. The control valve, in conjunction with a control unit of the oven, allows the transfer of liquid from the liquid tank to the transfer pipe at a predetermined time and/or flow rate in a cooking program that requires steam cooking support. In a possible embodiment, the valve is equipped with a pump to ensure that the liquid coming from the liquid tank is transferred to the transfer pipe under pressure. In a preferred embodiment of the invention, the liquid reservoir is placed above the cavity, with the cavity remaining at the bottom. In this way, the potential energy of the liquid in the liquid tank is utilized and the liquid is transferred to the transport pipe under hydrostatic pressure, allowing the liquid to move towards the cavity on its own. In a preferred embodiment of the invention, the opening is provided on a rear wall of the cavity. In this way, the distribution extension does not prevent the advancement of accessories such as trays and grills to be placed in the cooking chamber. The opening on the rear wall allows the distribution extension to pass through the rear wall from the outer part of the cavity to the inner part, and a compact steam support device for the oven is obtained. A preferred embodiment of the invention includes a convection fan mounted on the rear wall, with one impeller remaining in the inward-facing part of the cavity. The convection fan allows the steam supplied to the interior of the cavity by the distribution extension provided on the rear wall to circulate in the cooking chamber. In a preferred embodiment of the invention, the resistance and distribution extension are located concentrically with the impeller, and the inward-facing part of the cavity contains a curtain that covers the impeller at a distance by providing at least one circulation opening on it. In this way, ovens that already include a convection fan are provided with a compact steam support device. When the electrical resistance works, the liquid coming from the distribution extension is evaporated and it is possible to distribute the steam given from the outlet opening towards the interior of the cavity to the cooking room with the convection fan. BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a rear perspective view of a representative embodiment of the electric oven of the invention, with the steam supply device adapted to the resistance. Figure 2 is a zoomed-in partial representation of the steam supply assembly shown in Figure 1, when mounted on an electrical resistance. Figure 3 is an installation representation of the steam supply assembly with convection fan. Figure 4 is a front view of a representative embodiment of the electric oven of the invention, with the fan protection plate and convection fan removed. Figure 5 is the front view of the electric oven shown in Figure 4 with the convection fan mounted. DETAILED DESCRIPTION OF THE INVENTION In this detailed description, the development of the invention is explained without any restrictions and with references to examples only to explain the subject better. The subject of the invention is shown in Figure 1. A representative embodiment of an oven is shown in rear perspective. A body (10) of the oven includes an upper panel (12) and a flange (14) located below it. The flange (14) surrounds a mouth (15). A hinged cover (not shown ) covers the mouth (15) in an openable way. The mouth (15) surrounds a cooking chamber surrounded by a cavity (20) in the body (10). The cavity (20) is obtained by joining metal plates to each other with the help of welding seam. Heat-resistant coated metal plates, It consists of a ceiling (22) fixed to each other, a floor (27), a rear wall (24) extending perpendicularly adjacent to the rear edges, and opposite side walls (26) provided perpendicularly between them. The front part of the cavity (20) is open to reach the mouth (15). There is a liquid loading opening (17) on the top panel (12). Thus, a vapor support device (40) is mounted with a liquid tank (41) to the body (10) from the front. The liquid tank (41) has a hollow, elongated structure and is connected to a control valve (42) from its rear end at one proximal end (43) of a transport pipe (44) that provides liquid transmission. The transport pipe (44) extends parallel to the ceiling (22) at its first end (43) until it partially passes the rear wall (24) at the exit of the control valve (42), and is then turned towards the rear wall (24) with an L-like elbow (45). The rear wall (24) is shown as transparent in Figure 1. A second end (47) of the transport pipe (44) reaching the rear wall (24) is turned perpendicularly towards the rear wall (24) with an elbow. An opening (28) is created on 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) transversely into a wide rectangle. A mounting element (60) adapts the steam support assembly (40) to the rear wall (24). A fixing plate (64) of the mounting element (60) is a flat metal plate that covers the opening (28) and ensures the passage of the second end (47) from the outer part (24) of the cavity (20) to the inner part through the opening (28). The mounting element (60) also enables the adaptation of an electrical resistance (30) to the rear wall (24). In addition, a motor (52) and a convection fan (50) with a propeller (54) fixed to its shaft are mounted at the center of the rear wall (24). The engine (52) is located on the outward-facing part of the rear wall (24), and the propeller (54) is located on the inward-facing part of the engine (52) in a rotating manner at the shaft end. In Figure 2, the mounting element (60) fixed on the rear wall (24) by covering the opening (28) with the help of a pin (61) and the transmission pipe (24) directed to the rear wall (24) with the inlet elbow (49) following the second end (47). 44) is shown enlarged by taking the distribution extension (46) and the electrical resistance (30) as part of a ring section (32). The mounting element (60) completely closes the opening (28) by leaning on the outward-facing part of the rear wall (24), thanks to the fixing plate (64) in the structure of a metal material strip that is resistant to the high temperatures (such as 250 °C) that the rear wall (24) is exposed to. A pin (61) is placed into the holes at opposite ends of the fixing plate (64) and covers the opening (28) in a leak-tight manner. An input end (31) and an output end (34) of suitable diameter of the electrical resistance (30) pass through a first hole (63) and a second hole (65) that are spaced across the length of the fixing plate (64) and their corresponding ends. A guide hole (66) is opened in the fixing plate (64) adjacent to the second hole (65). The diameter of the guide hole (66) is equal to the outer diameter of the transfer pipe (44), and the second end (47) of the transfer pipe (44) is placed in the guide hole (66) with an inlet elbow (49) supported directly from the guide hole (66). The inlet elbow (49) is in L form. The entry elbow (49) enables the second end (47), which runs perpendicularly from the outer part of the rear wall (24), to define a distribution extension (46) by rotating it adjacent and parallel on the inside of the rear wall (24). The input elbow (49) carries the weight of the distribution extension (46) directly in the guide hole (66) where it fits. The distribution extension (46) is the extension of the second end (47) inside the cavity (20). The resistance (30) electrical connection comes from the mains connection (not shown) to which the input end (31) and output end (34) are connected to conduct electricity on the outward facing part of the cavity (20). The resistance (30) extends in a two-type ring section (32) between the input end (31) and the output end (34) passing through the mounting element (60) in close proximity to each other. The distribution extension (46) forms a concentric circular arc in the upper part of the ring section (32) and at a distance above it, compatible with the outer diameter of the ring section (32). The circular arc of the distribution extension (46) is approximately 15° relative 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 close part (463) that is a continuation of the inlet elbow (49) and a remote part (464) that is distant. The inner portion 462 is close but spaced from the annular portion 32, defining an evaporation section 35 from its corresponding portion. The distance is provided with the help of a bracket (70) extending from one end to the evaporation section (35) and from the other end to the remote section (464). The bracket (70) is made of a metal with low heat conductivity. The outlet openings (461) in the form of sequential slits opening towards the inner part (462) on the distribution extension (46) facing the evaporation section (35) and supply steam to the inner part of the cavity (20) through the hole located at the widened free end (48). In Figure 3, the components that enable the steam support device (40) to supply steam to the oven are shown in rear perspective without the cavity (20). The liquid tank (41) is filled with water as required by the user. When steam support is required while the oven is in operation, the control element opens the control valve (42) and ensures that the water coming from the liquid tank (41) from the first end (43) is pressurized by the control valve (42) and filled into the transfer pipe (44). Water passing through the control valve (42) moves towards the rear wall (24), parallel and distant 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 vertically through the elbow to the rear wall (24) from its outer side and passed over the fixing plate (64). The fixing plate (64) also enables the resistance (30) to pass from the ring part (32) to the corresponding first hole (63) and second hole (65) from the opposite inlet end (31) and outlet end (34). The second end (47), which fits into the guide hole (66) from the inlet elbow (49), follows the ring part (32) and forms the distribution extension (46), with the free end (48) facing downwards. The rotation center of the motor (52) of the convection fan (50) is adjusted coaxially with the circle center of the ring part (32). As shown in Figure 4, the part of the steam support device (40) passing to the rear wall (24) is only the distribution extension (46) based on the inlet elbow (49) fixing plate (64). The rear wall (24) is equipped with the steam support device (40). When it is to be installed, the mounting element (60) is placed in the opening (28) and the pins (61) are mounted on the rear wall (24).In this way, on the part of the rear wall (24) facing the cooking chamber, only the resistance (30) and the distribution extension (46) placed on it are visible. The outlet openings (461) are arranged radially inwards on the interior (462). In Figure 5, the oven is shown from the front and on the rear wall (24) with the fan (54) placed. The fan (54) is in the middle center of the rear wall (24). A curtain (80) that serves as a protection sheet is placed in front of the impeller (54). Thus, the impeller (54) is protected from splashes in the cooking room by the curtain (80). By leaving a distance at the edges of the curtain (80), the circulation opening (82) is opened. has been created. When the oven is closed, there is no liquid in the liquid tank (41) or it is not put into steam assisted operation mode, the control valve (42) blocks the transfer pipe (44). If steam support is required, the control valve (42) allows water passage. Thus, the water supplied from the liquid tank (41) above the cavity (20) is carried to the rear wall (24) via the transport pipe (44) and from there it is taken to the distribution extension (46). When the resistance (30) is in operation or in a hot state, the water evaporating in the metal distribution extension (46) progresses radially inwards through the outlet opening (461) and reaches the impeller (54). The fan (54) distributes the steam to the cooking room through the circulation openings (82).TR

Claims (7)

1.CLAIMS 2. A cavity (20) surrounding a cooking chamber accessible from an opening (15); An electrical resistance (30) fixed on the inward-facing part of the cavity (20) and a liquid tank (41) provided on the outward-facing part of the cavity (20) are connected to a leak-tight and opposite connection that supplies liquid to the liquid tank (41) from one proximal end (43). It is an electric oven containing a steam support device (40) with a transport pipe (44) extending from its far end (47) through an opening (28) to the interior of the cavity (20). 47) contains a metal distribution extension (46) that is at least partially extended adjacent to the electrical resistance (30) and has at least one outlet opening (461) that allows steam passage. 3. It is a furnace in accordance with Claim 1, and its feature is that it contains an inlet elbow (49) formed by bending from the far end (47) towards the cavity (20), allowing the distribution extension (46) to extend close to the cavity (20). 4. It is a furnace in accordance with claim 2 and is characterized by the fact that the inlet elbow (49) is an L elbow. 5. It is a furnace in accordance with Claim 2-3, and its feature is that it has a guide hole (66) provided in the cavity (20) through which the distribution extension (46) passes, so as to directly support the inlet elbow (49) against the weight of the distribution extension (46). It contains a mounting element (60). 6. It is an oven in accordance with claim 4, and its feature is that the electrical resistance (30) adjacent to the guide hole (66) of the mounting element (60) has an inlet and outlet end (31, 34) extending from the inward-facing part of the cavity (20) to the outward-facing part. ) contains a corresponding first hole (63) and a second hole (65). 7. It is an oven according to claims 4-5 and is characterized by the fact that the mounting element (60) is fixed to the cavity (20) in a plate structure that covers the opening (28) from end to end. It is an oven in accordance with any of the previous claims, and its feature is that it contains a metal bracket (70) that is fixed to the distribution extension (46) from one end and to the electrical resistance (30) from the other end, keeping the distribution extension (46) and the electrical resistance (30) close to each other.8. - It is a furnace in accordance with any of the previous claims and is characterized by the outlet opening (461) being in the form of a slit opened on the lateral wall of the distribution extension (46). 9.- It is a furnace in accordance with any of the previous claims and its feature is that the electrical resistance (30) It is characterized in that it contains a ring part (32) that extends essentially parallel to the cavity (20) and that the distribution extension (46) has a curvilinear form following the ring part (32). 10.-It is a furnace in accordance with any of the previous claims and its feature is that the liquid tank ( 41) is located at a front part and contains a liquid loading opening (17) provided in the body (10) from the part facing the mouth (15). 11.-It is an oven in accordance with any of the previous claims and its feature is the transfer pipe (44) and the liquid tank (41). 12.-It is a furnace in accordance with any of the previous claims and its feature is that it is located between ) and provides liquid passage selectively and in a steam support mode, it provides liquid passage in a way that conveys the liquid in the liquid tank (41) to the transfer pipe (44). is characterized by the fact that the liquid reservoir (41) is placed higher than the cavity (20) so that the cavity (20) remains below. 13.-It is a furnace in accordance with any of the previous claims and its feature is that the opening (28) is located on a rear wall (24) of the cavity (20). 14.-It is an oven in accordance with claim 13 and its feature is that it includes a convection fan (50) mounted on the rear wall (24) with one fan (54) remaining on the inward facing part of the cavity (20).15. -It is a furnace in accordance with claim 14 and its feature is that the resistance (30) and the distribution extension (46) are placed concentrically with the propeller (54) and at least one circulation opening (82) is provided on the inward-facing part of the cavity (20) and the propeller ( 54) contains a curtain (80) that closes it at a distance. TR