TECHNICAL FIELD

Present invention relates to a domestic oven equipped with a cover comprising more than one pane that provide air circulation via an airflow duct.

STATE OF THE ART

A cooling assembly provides air circulation disposed at the outer periphery of the cooking chamber confined by a muffle of a domestic oven. The cooling assembly conveys the air drawn from outside the cavity with by means of a fan in an airflow duct, transmits it to a channel at the upper edge of the cavity, and blows it out through a strip-shaped exhaust opening between the front panel and the top of the cover. Meanwhile, negative pressure builds up in an upper opening that reaches the gap between the cover glass panes at the top of the cover. Therefore, the cooling air conveyed under the cover is sucked from the upper opening and discharged to the outer environment through the channel.

EP2278227 discloses an oven comprising an air intake opening equipped with a muffle; wherein an air intake opening is mounted on the muffle, in which the air flow forced by the cooling fan located in the rear portion of the oven is deflected in the direction of the outer opening located in the front portion of the oven, a cover has at least one airflow channel delimited by inner and outer plates closing the cooking liner; wherein the cover comprises at least one air outlet opening for discharging heated air flowing upwards and being driven outward in the remainder of the air flow, and the lower face of the cover comprises at least one air inlet opening. Herein, the airflow channel is configured as a bottleneck and its middle portion is above the gap formed between the cover and the muffle in the closed position of the cover, and the cross section of the airflow channel expands in the direction of the outer opening after the bottleneck.

BRIEF DESCRIPTION OF THE INVENTION

Object of the invention is to provide a homogeneous cooling along the upper side of the oven cover. In order to achieve the aforementioned objective the invention relates to a muffle confining a cooking chamber on a casing; a cover hinged to the casing to seal the cooking chamber and having an inner pane and an outer pane spaced apart from each other so as to form a cooling channel; and an airflow duct provided at the upper side of the muffle and at a distance from a front end to an exhaust opening defined between the outer pane of the cover and a spaced lower edge of the upper pane thereto. The oven further comprises a nozzle adapted to transmit air from a rear portion to the front end of the airflow duct is equipped with a channel cross-sectionally narrows in the direction of the conveyed air so as to at least partially focus the cooling air into the exhaust opening. Nozzle helps to transmit the air conveyed from the airflow duct to the exhaust opening by gaining momentum to the air. Then, it is possible to deliver the cooling air from the casing to the outer environment without creating any turbulence. This also ensures that the oven operates more quietly.

In a preferred embodiment of the invention, the nozzle extends transversely over the front end of the airflow duct, parallel and distanced from the exhaust opening. In this way, outer pane of the cover can be cooled from its upper side through the exhaust opening.

In a preferred embodiment of the invention, nozzle comprises a plurality of compartments separated from each other by dividing walls extending transversely along the channel so as to form a diffuser. Diffuser structure ensures the homogenous cooling of the upper side of the nozzle cover. The diffuser structure can distribute the channels evenly, or it can be arranged in a way to provide more air flow to certain areas, for example near the edges, in possible embodiments of the invention.

A preferred embodiment of the invention the channel is arranged to taper from an inlet end mounted at the front end to an outlet end facing the exhaust opening. Therefore, the air conveyed from the airflow duct to nozzle is accelerated through the outlet end.

A preferred embodiment of the invention comprises a flat and opposite upper wall and a lower wall extending at an angle between the inlet end and the outlet end of the channel. In this way, it is possible to accelerate the air conveyed from the airflow duct without causing a turbulence.

A preferred embodiment of the invention comprises an upper strip that covers the upper sides of the inner pane and outer pane and has an outlet opening above that opens from the cooling channel to the exhaust opening. Upper strip is accelerated by the nozzle, allowing the air blown into the exhaust opening to suck the cooling air between the inner and outer panes with a venturi effect along the upper edge of the cover. In a possible embodiment, there may also be one or more intermediate panes between the inner and outer panes in parallel and at a distance.

In a preferred embodiment of the invention, upper strip extends to the rear portion of the nozzle and forms a bended form, delimiting a suction channel narrowing between the muffle and the nozzle. It has been surprisingly found that it reduces the noise of the air discharged from the airflow duct.

In a preferred embodiment of the invention, the outlet opening is aligned perpendicular to the nozzle channel. In this way, the vacuum applied to the airflow duct increases and the venturi effect obtained by the air blown from the airflow duct becomes higher, increasing the cooling performance of the inner and outer pane thereof.

In a preferred embodiment of the invention, the nozzle is adjusted so as to ensure that the outlet end is aligned directly with the exhaust opening. This allows the cooling air to be conveyed to the outer environment from the outlet opening, reducing the air turbulence.

In a preferred embodiment of the invention, the outer pane is made from glass. Glass pane is cooled with the air discharged from the exhaust opening through its upper edge.

In a preferred embodiment of the invention, a tab is provided integrally on the nozzle and engages a corresponding connecting extension on the muffle. Nozzle can be easily mounted on the muffle via the tab and demounted for service whenever it is needed.

A preferred embodiment of the invention comprises a lug provided extending outwardly over the nozzle and a wide section provided in the airflow duct, through which the lug is arranged to pass, and a mounting hole that narrows through the air conduction direction, comprising a narrow section via which the lug engages therefrom. In this way, it is ensured that the nozzle is mounted to the airflow duct through the mounting hole with a simple push action. In this way, the lug is first passed the wide section, and then pushed towards the narrow section and engaged and placed in the airflow duct in a movable manner with the lug.

In a preferred embodiment of the invention, the nozzle is plastic injection molded in one- piece. A nozzle that is least affected by thermal expansion and maintains its structural integrity is obtained via plastic injection. BRIEF DESCRIPTION OF THE FIGURES

Figure 1 is a cross-sectional illustration of a representative embodiment of a built-in oven with the side cooling device visible.

Figure 2 is a perspective illustration of a representative embodiment of a nozzle in the furnace cooling assembly.

Figure 3 is a partial zoomed-in illustration of the nozzle shown in Figure 2.

Figure 4 is a front elevational illustration of the compartment structure of the nozzle.

Figure 5 is a side sectional illustration of a nozzle in a representative embodiment of the oven according to the invention.

DETAILED DESCRIPTION OF THE INVENTION

In this detailed explanation, the development according to the invention is explained only for a better understanding of the subject without any limiting effect.

In Figure 1 , a representative embodiment of the oven according to the invention is cross- sectionally shown with the side ventilation device. The casing (1 ) is of a prismatic structure consisting of planar panes. An upper pane (50) with control elements is mounted on the front wall (52) of the casing (1 ) facing the user. The upper pane (50) is vertically aligned with an outer pane (62) of a cover (60) at its bottom. The cover (60) is of a multi-pane structure and releasably covers a muffle (40) from an inner pane (67). On the upper side of the cover (60), there is an upper strip (66) which extends to form a bridge structure. The upper strip (66) covers the upper side of the cover (60) transversely. The upper strip (66) wraps around the inner pane (67) from its upper edge at one end and touches the inner wall of the outer pane (62) from the other end. An intermediate pane (68) defines a cooling channel (61 ) below the upper strip (66), spaced and parallel to the outer pane (62) and the inner pane (67). The cooling channel (61 ) is connected at its lower end with an air inlet (not shown). The cooling air supplied in the cooling channel (61 ) and is conducted between the panes (62, 67, 68) is directed to the outlet opening (69) from the inner wall of the upper strip (66). The upper strip (66) is in the form of a V-like angled profile. The upper end of the cooling channel (61 ), on the other hand, reaches an outlet opening (69) that is opened longitudinally on the upper strip (66) by providing air transmission. The outlet opening (69) is in the form of a through hole obtained by partially cutting the upper strip. An exhaust opening (4) is located in the form of a strip between the upper edge (64) of the outer pane (62) and a flat lower edge (54) of the upper pane (50). The exhaust opening (4) opens into a chamber delimited from the bottom by the upper strip (66) and located behind the front wall (52). The muffle (40) is covered by the inner pane (67) from an intake (43) when the cover (60) is in the closed position. A airflow duct (20) is mounted on the upper side (42) of the muffle (40) in a flat wall structure, which is obtained by shaping a plate via delimiting the channel. The airflow duct (20) has an escalated portion (24) at its rear and is narrowed towards a front portion (22) in the other direction. The escalated portion (26) is equipped with a fan housing (26). An axial fan assembly (30) is fixed within the fan housing (26) with a fixation plate. The fan assembly (30) is connected to an air inlet (5) from the upper side. The air received from the air inlet (5) with the fan assembly (30) is forced forwardly from the escalated portion (24) and proceeds to the front portion (22). The front portion (22) is an opening in the form of a strip and the cooling air is extracted from the airflow duct (20) thereof.

A nozzle (10) is of a large diffuser-like structure extending along the front portion (22) and is mounted to the front portion (22) from an inlet end (128). The nozzle (10) is monolithically produced via injection molded plastic that is resistant to temperatures above 200 degrees Celsius. The front end (23) forming a fixing section is obtained by extending the upper edge of the front portion (22) outwardly. Front end (23) is perspectively illustrated in the Figure 2. A through-mounting hole (21 ) is drilled above the front end (23) in the plate structure. The mounting hole (21 ) comprises a wide section (212) advancing towards the front wall (11 ) and joined to one another, followed by a narrow section (214). A cork-like lug (14) lies through the planar ceiling (16) of the nozzle (10). The lug (14) is sized to pass from its circular upper side to the wide section (212). On the other hand, the narrow section (214) is narrower than the upper end of the lug (14) and wider than the handle. In this way, it is ensured that the nozzle (10) hangs at the front end (23) by passing it over the wide section (212) on the ceiling (16) and pushing it towards the narrow section (214). The mounting hole (21 ) extends transversely at the front end (23). The channel (12) comprises a discharge end (122) and a planar lower wall (124). Parallel wings (126) that are adjustable on each side extend through the rear edges of the channel (12).

An exemplary nozzle (10) is perspectively illustrated in Figure 3. The channels (12) on the monolithic nozzle (10) extend from one end to the other in the same form and at a distance, with a partition wall (16) located between them on the front wall (11 ). The channels (16) are grouped and arranged on the front wall (11 ). The lateral channels (12) each form a side blowing element (A) and have a larger dividing wall (15) with the middle blowing element formed by the channels (12) densified in the middle portion. In this way, the cross-sectional area of the channel (12) in the middle portion of the nozzle (10) is increased compared to the side parts. This reduces the cooling air turbulence formed at the edges at the junction from the front end (23) of the airflow duct (20) to the nozzle (10). A tab (17) formed on the rear edge of the nozzle (10) in the lower corner ensures that the nozzle (10) is fixed to the muffle (40) by snapping. Side blowing element (A) is located on both sides. Side blowing element (A) and the middle blowing element (B) together form a diffuser and ensure that the cooling air conveyed from the rear is directed to the exhaust opening (4) from the front portion.

In Figure 4, the ceiling (16) is partially demonstrated with two separate holding elements (14) of the nozzle (10). The channels (12) are seperated into flat compartments with dividing walls (15). The nozzle (10) is hung in a balanced manner by attaching more than one lug (14) at a distance from each other to the corresponding mounting holes (21 ). In Figure 5, the channel (12) is cross-sectionally illustrated, demonstrating each compartment thereof. The channel (12) has a structure that narrows frontwardly. The channel (12) section is in the form of a trapezium. The upper wall (121 ) corresponding to the ceiling (16) extends narrowly inclined towards the vertically planar outlet end (122) from the rear inlet end (128) which opens to the front portion (22), providing air transmission thereof. The lower wall (124), which is located in the opposite direction and forms the bottom of the channel (12), extends from the inlet end (128) in a manner that narrows the cross-section of the outlet end (122). Inclination angle of the lower wall (124) is higher than the inclination angle of the upper wall (121 ). The wing (126) extends outwardly from the inlet end (128) through the side wall. Rear upper edge of the channel (126) is inclined downwardly. The Tab (17) extends down from the lower wall (124) in the form of an arrowhead in the lower portion of the channel (12). The tab (17) is integrated to the nozzle (10) and has a compression compartment (172) located through the inclined portion (173) narrowing frontwardly. Free end of the compression compartment (172) has a retainer extension (171 ) extending vertically downwardly. As seen in Figure 1 , the connection extension (44) in a wedge structure on the upper edge of the muffle (40) has an end section where the retainer extension (171 ) will be mounted. The nozzle (10) is aligned adjacent to the front portion (22), and the lug (14) is placed at the front end (23) and suspended from the upper side, and fixed to the muffle (40) by engaging the connection extension (44) from the bottom. The nozzle (10) evacuates the cooling air supplied by the airflow duct (20) through the channels (12) from its front portion (22). Meanwhile, the air flow is directed towards the exhaust opening (4) with an inclined angle within the channels (12) of the nozzle (10). Compression compartment (172) partially surrounds the suction channel (2) formed on the upper side of the muffle (40) from the top and ensures that the upper strip (66) forms a narrowing duct with the upper bending part. Narrowing duct, on the other hand, expands at the front portion (22) and reaches the exhaust opening (4). The outlet opening (69) is located in the expansion area and is taken out from the exhaust opening (4) by causing a venturi effect with the cooling air blown by the nozzle (10).

REFERENCE NUMBERS

1 Casing 214 Narrow section

2 Suction channel 22 Front portion

3 Cooking chamber 23 Front end

4 Exhaust opening 24 Escalated portion

10 Nozzle 26 Fan housing

11 Front wall 30 Fan assembly

12 Channel 40 Muffle

121 Upper wall 42 Upper side

122 Discharge end 43 Intake

124 Lower wall 44 Connection extension

126 Wing 50 Upper pane

128 Inlet end 52 Front wall

14 Lug 54 Lower edge

15 Dividing wall 60 Cover

16 Ceiling 61 Cooling channel

17 Tab 62 Outer pane

171 Retainer extension 64 Upper edge

172 Compression compartment 66 Upper strip

173 Inclined portion 67 Inner pane

18 Rear portion 68 Intermediate pane

20 Airflow duct 69 Outlet channel

21 Mounting hole A Side blowing element

212 Wide section B Middle blowing element