WO2021086280A1

WO2021086280A1 - An oven with door cooling assembly

Info

Publication number: WO2021086280A1
Application number: PCT/TR2019/050918
Authority: WO
Inventors: Mehmet Baris Gocer; Yahya AKKUS; Ogun DUZGUN; Erdem EROGLU; Abdulbaki DURSUN
Original assignee: Femas Metal San. Ve Tic. A.S.
Priority date: 2019-11-02
Filing date: 2019-11-02
Publication date: 2021-05-06
Also published as: EP4034815A4; EP4034815A1

Abstract

The invention relates to an oven comprising a cavity (1) confining a cooking chamber and a door (10) having an outer panel (12) and an inner panel (16) covering the opening of the cavity (1) in an selectively accessible manner attached parallel to each other at a distance such that providing a cooling channel (5) there between in which an upward cooling airstream (f₁) pass through and a lateral plate (50) covering the cooling channel (5) from the side. The oven further comprises a grid element (40) with a plurality of openings (44) of which the cross-sectional area is adjusted such that an auxiliary airstream (f₂) supplied from the outside ambient air is mixed to the cooling airstream (f₁) through the lateral plate (50) and at least partially covering the cooling channel (5).

Description

AN OVEN WITH DOOR COOLING ASSEMBLY

TECHNICAL FIELD

The present invention relates to ovens with a door with a view through access, in particular an oven with a door cooling assembly where cooling is performed by airstream between an inner and outer panel of the door.

BACKGROUND ART

In ovens with a door with a view through access, a cavity in which electric heaters or a gas burner are located and confining a cooking chamber is covered by a door in a hinged manner with a window at the front that allows the cooking chamber to be viewed.

The door is generally assembled by fixing one or more panels at a distance from each other. The oven door is the part of the ovens where the user touch. The maximum temperature allowed in some standards on the outer door of the oven is 85-105°C. In pyrolytic oven operating at high temperatures, the door is equipped with four different glass pane in addition to a separate ventilation module to reduce the door temperature. In multi-functional products, the temperature set in the oven is maximum 250°C. Therefore, temperature should decrease to an average of 150-170°C from the interior of the oven to the outer door after a door thickness around 35-40 mm. Additionally, this temperature difference is higher in pyrolytic products.

DE10349313 discloses vertical flow channels with external air access at the cavity boundaries of the oven door between the side walls and an oven muffle front flange are provided, and that the flow barriers preferably block these flow channels in both directions vertically.

These lateral sections can reach the large area spaces of the panels by means of additional flow openings with their U-shaped and structure with their own cavity. In ovens with two glass panels, such as electric ovens with pyrolytic self-cleaning feature, airstream is provided between the windows cooled from the slots in the side frame. Deflectors are provided on each side frame that divide the cooling airflow into the upper and lower section. In this way, the road is shortened, the warming effect between the windows is minimized and safe outer panel temperature is provided. BRIEF DESCRIPTION OF THE INVENTION

The object of the invention is to increase the cooling efficiency of the outer panel in the oven door with a cooling airstream.

In order to achieve the aforementioned objectives, the invention includes an oven comprising a cavity confining a cooking chamber and a door having an outer panel and an inner panel covering the opening of the cavity in a selectively accessible manner attached parallel to each other at a distance such that they provide a cooling channel therebetween in which an upward cooling airstream pass through, and lateral plate covering the cooling channel from the side. The oven further comprises a grid element having a plurality of openings of which their cross- sectional area is adjusted such that an auxiliary airstream supplied from outer ambient air is mixed into the cooling airstream through lateral plate and at least partly covering the cooling channel. The grid element feeds an auxiliary airstream through the openings to the cooling channel and reduces the heating of the cooling airstream in the cooling channel. Also, the grid element reduces the negative effects that may occur in the flow dynamics of the cooling airstream by directly supplying the auxiliary airstream supplied from the external environment.

In a preferred embodiment of the invention, the grill element is provided at the upper section of the lateral plate. In this case, the grid element supplies the ambient air to the section where the cooling airstream is most heated, as an auxiliary airstream. Thus, the area where the temperature peaks in the outer panel is cooled more effectively and the highest temperature value that the outer panel can reach is reduced.

A preferred embodiment of the invention comprises a holding cap that is fixedly engaged such that it fixes the outer panel and the inner panel from the top and the grid element directly abuts the holding cap from an upper edge thereof. The holding cap helps securing the outer panel and the inner panel from the top, protecting the cooling channel therebetween.

In a preferred embodiment of the invention, a lateral section of the holding cap and the grid element are aligned in the same vertical plane. In this case, since the grid does not protrude outward from the lateral panel of the door, in case the door is closed, the grid adaptation can be made without changing the dimensions at the cavity opening.

In a preferred embodiment of the invention, the grid element comprises a plurality of flat extensions, between each pair of which the gap is limited. Flat extensions can be in the form of straight fins parallel to each other, or they can be made in different forms, for example vertically aligned, successive V-form. Flat extensions help transferring heat to the external environment with its straight fin form and heat removal from the lateral plate by convection.

A preferred embodiment of the invention comprises a slot having an outward-facing radial inlet extending on the lateral plate along the opening. The slot reduces the pressure of the ambient air it supplies from the inlet facing outwards and prevents turbulence in the cooling airstream to which the auxiliary airstream is added.

In a preferred embodiment of the invention, each extension extends transversely from the lateral plate towards the inner panel. Thus, the auxiliary airstream can be drawn directly across the relevant part of the cavity. It has been found that this surprisingly increases the cooling efficiency of the outer panel.

In a preferred embodiment of the invention, the distal ends of the extensions are aligned parallel to each other in a vertical plane directly abutting the inner panel from the outside. Thus, on the one hand, a support element is provided between the inner panel and the outer panel, and on the other hand, the heat transfer surface from the hot inner panel to the outer panel is reduced, so that the cross section of the extensions is reduced to the sum.

In a preferred embodiment of the invention, the grid element is provided at an upper section of the lateral plate extending from its one lower edge across between the outer panel and the inner panel. Thus, while the lateral plate covers the lower and middle sections of the mutual lateral face of the inner and outer panel, the grid is adapted to the upper section where the temperature is highest in the outer panel.

In a preferred embodiment of the invention, the outer panel and the inner panel are made of glass. In this case, both visual access to the inner chamber limited by the cavity is possible and the temperature of the outer panel is kept below 100° by reducing the heat transfer compared to the metal panel.

In a preferred embodiment of the invention, the lateral plate and the grid element are integral. Thus, it is possible to obtain a part that automatically supplies the auxiliary airstream while closing the lateral section between the inner panel and the outer panel. It is not necessary to assemble separate sections together. Also, the lateral plate and the grid element react together against thermal stresses and the door structural integrity is easily maintained in case of heating. BRIEF DESCRIPTION OF THE DRAWINGS

Figure 1 is a side schematic cross-sectional view of a representative embodiment of an oven having the inventive door cooling assembly, including the cooling airstream.

Figure 2 is an interior perspective view of a door used in a representative embodiment of the oven comprising the inventive door cooling assembly.

Figure 3 is an enlarged view of the upper side of the door shown in Figure 2.

Figure 4 is a side view of a lateral plate comprising an integrated grid element.

Figure 5 is an enlarged view of the section of the lateral plate shown in Figure 4, comprising the grid element.

Figure 6 is an illustration of the partial door-inside grid element layout of a representative embodiment of an oven having the inventive door cooling assembly.

DETAILED DESCRIPTION OF THE INVENTION

In this detailed description, the inventive development is described without any limitation and only with reference to the examples for a better disclosure of the subject.

In Figure 1 , a representative embodiment of the inventive oven is shown schematically by taking a side section. The oven comprises a cavity (1) confining a cooking chamber and an openable and closable door (10) in the form of a panel (2) that closes the opening of the cavity (1) in a hinged manner from the bottom. At the upper section of the cavity (1), an air channel (3) is provided, in which air movement is provided by a fan (4). The air channel (3) discharges the air coming from the chimney of the cavity (1) and from the bottom of a cooling channel (5) in the panel (2) through an exhaust hole located above the panel (2).

In Figure 2, the door (10) with cooling assembly used in the oven is shown in perspective in the assembled condition. The door (10) comprises a flat inner panel (16) forming a viewing section (18) made of translucent glass and covering the cavity, and a flat outer panel (12) made of glass provided in parallel with and spaced from the inner panel. A handle (11) is provided in the upper section of the outer panel (12) that extends transversely and is attached to the outer panel (12) at its ends. A holding cap (20) is mounted transversely across the upper edges of the outer panel (12) and inner panel (16). The holding cap (20) surrounds the cap (10) circumferentially from the top. The holding cap (20) with an U-section form, extends from the rear to the upper edge of the inner panel (16), and grasps a lateral plate (50) extending vertically between the outer panel (12) and the inner panel (16) from the sides, with its extension on one side (22) from above. The holding cap (20) covers the cooling channel (5) between the outer panel (12) and the inner panel (16) with an upper section (26). In the upper section (26) elongated openings (24) are provided at a distance from each other. The openings (24) allow air discharge from the cooling channel (5). On the other hand, a housing (25) in a cut form is provided in the middle of the lateral plate (50) extending from the top of the holding cap (20). As shown in Figure 3, an opening element (32) in the button form of a locking mechanism (30) extends out of this housing (25). The opening element (32) is adjusted such that it enables the holding cap (20) to be removed from the upper section of the outer and inner panels (12, 16) when pressed. The lateral plate (50) is located close to the hinge (not shown) from a lower end (52) of its elongated body (54). As of the upper section (56) of the elongated body (54), which is opposite to the lower end (52), a slot (58) reaches the cooling channel (5) by extending upwards on a support section (57). The support section (57) is the column of the elongated body (54) of the lateral plate (50) that extends adjacent to the outer panel (12) and the slot (58) is located at the section facing the inner panel (16). A grid element (40) is provided in the lateral plate (50) integrally and as covering the slot (58). The grid element (40) comprises a plurality of wing-shaped extensions (42) arranged vertically in equal width by arranging parallel-wise and spaced from each other. Each of the extensions (42) abuts the outer plate (12) from one proximal end (41), on the other hand, from an opposite distal end (43), it abuts the inner panel (16) by covering the slot (58) transversely. Openings (44) in the form of a thin slit are provided between the extensions (42). The holding cap (20) fits on a corresponding upper edge (47) of the grid element (40) along its lower edges (27), with its lateral section (22) and subsequently an inner section (29) bent over the inner panel (16). Lateral section (22) and extensions (42) are aligned in the same vertical plane. The inner section (29) is aligned with the inner wall of the inner panel (16).

By forming the outer panel (12) to form a flange, the holding cap (20) and the inner panel (16) are kept shorter than this. On the other hand, when the door (10) is in the closed position, it is possible for the air to enter from the distance between the cavity (1) and the lateral plate (50). From the cooling channel (5), a cooling airstream (f-i) is supplied from the lower section of the door (10) in an upward direction and an auxiliary airstream (f₂) is transferred to it through the grid element (40) through the openings (44) to the slot (58) and from here it is added to the cooling channel (5). In Figure 4, the lateral plate (50) carrying the grid element (40) is shown from the side. The lateral plate (50) in the form of a column has a handle section (59) that is seated to the holding cap (20) from inside. The upper edge (47) is the same size as the holding cap (20) in accordance with the height of the holding cap (20) so that the holding cap (20) is placed from the lateral section (22). The outer panel (12) and the opposing lateral plates (50), which cover the lateral cavities of the inner panel (16), sit from the corners of the holding cap (20), abutting the lateral section (22). A lower section (49) of the grid element (40) is located in an upper section (56) of the lateral plate (50).

In Figure 5, the lateral plate (50) is shown in perspective and as zoomed. Here, the U profile (592) structure of the holding section (59) can be seen. There is a hole (591 ) on the frontal surface of the U profile (592) extending upwards from the support section (57). This hole (591) is concentric with the housing (25) of the holding cap (20). Thus, the opening element (32) passes through the hole (591) and reaches the housing (25) from there and extends outwards from the housing (25). A top section (593) of the handle section (59) is in flat form and the holding cap (20) sits in this section from inside.

The area between the extensions (42) in the form of flat plates (42) from its proximal end (41) in the support section, comprises a radial inlet (581) that extends towards the slot (58). The curvilinear radial inlet (581) gives a convex form to the inlet that limits the openings (44) on the support section (57) side and provides transition to the slot (58). Thus, the radial inlet (581) between both adjacent proximal ends (41) prevents the auxiliary airstream (f₂) from causing turbulence in the auxiliary airstream (f₂) due to its form by preventing the formation of sharp edges during its progress from the external environment towards the slot (58).

As shown in Figure 6, when the cooling airstream (f-i) moving from bottom to top in the air channel (3) during the operation of the oven rises to the level of the grid element (40), with the vertical flow, an additional air intake area is obtained on the slot (58) through the lateral plate (50) with the vertical flow. Thus, the ambient air passing between the cavity (1) and the panel (2) is taken into the openings (44) between the extensions (42) and passes to the slot (58) from here, and is supplied to the cooling channel (5) such that it creates an auxiliary airstream (f2) along the length of the grid element (40). Thus, the cooling airstream (f i), which moves in contact with the hot inner panel (16) and the temperature of which increases as it rises, is cooled again with the auxiliary airstream (f₂) that is added from the slot (58). The grid element (40) is minimally affected by the hot inner panel (16) with the structure of the extensions (42) in the transverse direction and narrowing towards the distal end (43) and the auxiliary airstream (f₂) supplied from the outside passes through the openings (44) is minimally negatively affected since the heating level is low.

REFERENCE NUMBERS

1 Cavity 40 Grid element

2 Panel 41 Proximal end

3 Air channel 42 Extension

4 Fan 43 Distal end

5 Cooling channel 44 Opening

10 Door 47 Top edge

11 Handle 49 Bottom edge

12 Outer panel 50 Lateral panel 16 Inner panel 52 Lower end

18 Viewing section 54 Elongated body 20 Holding cap 56 Top section 22 Lateral section 57 Support section

24 Opening 58 Slot

25 Housing 581 Radial entry section

26 Upper section 59 Handle section

27 Lower edge 591 Hole

29 Inner section 592 U profile

30 Locking mechanism 593 Top section 32 Opening element fi Cooling airstream f₂ Auxiliary airstream

Claims

1. An oven having a door comprising a cavity (1) confining a cooking chamber and a door (10) having an outer panel (12) and an inner panel (16) covering the opening of the cavity (1) in an selectively accessible manner attached parallel to each other at a distance such that providing a cooling channel (5) in which an upward cooling airstream (fi) pass through and a lateral plate (50) covering the cooling channel (5) from the side characterized bya grid element (40) having a plurality of openings (44) of which the cross-sectional area is adjusted such that an auxiliary airstream (f₂) supplied from the outside ambient air is mixed into the cooling airstream (f-i) through the lateral plate (50) and at least partially covering the cooling channel (5).

2. An oven according to claim 1 , wherein the grid element (40) is provided on the upper part of the lateral plate (50).

3. An oven according to claim 2, wherein a holding cap (20) is engaged from the top fixing the outer panel (12) and the inner panel (16) and grid element (40) directly abuts the holding cap (20) from an upper edge (47).

4. An oven according to claim 3, wherein a lateral section (22) of the holding cap (20) and the grid element (40) are aligned in the same vertical plane.

5. An oven according to any of the preceding claims, wherein the grid element (40) comprises a plurality of flat extensions (42) between each pair of which the opening (44) is delimited.

6. An oven according to claim 5, wherein a slot (58) is having an outward facing radial inlet (581) extending on the lateral plate (50) along the opening (44).

7. An oven according to claims 5-6, wherein each extension (42) protrudes transversely from the lateral plate (50) towards the inner panel (16).

8. An oven according to claim 7, wherein the distal ends (43) of the extensions (42) are aligned directly abutting the inner panel (16) in a vertical plane parallel to each other.

9. An oven according to any one of the preceding claims, wherein the grid element (40) is provided in an upper section (56) of the lateral plate (50) extending from its lower edge (49) across between the outer panel (12) and the inner panel (16).

10. An oven according to any of the preceding claims, wherein the outer panel (12) and the inner panel (16) are made of glass.

11. An oven according to any of the preceding claims, wherein the lateral plate (50) and the grid element (40) are integral.