WO2023048657A1

WO2023048657A1 - A built-in hood with extended casing

Info

Publication number: WO2023048657A1
Application number: PCT/TR2021/050446
Authority: WO
Inventors: Ozan GULBEY; Mertcan BIRSEN; Resat COSKUN; Samet CANDAN
Original assignee: Femas Metal San. Ve Tic. A.S.
Priority date: 2021-05-07
Filing date: 2021-05-07
Publication date: 2023-03-30

Abstract

The invention relates to a built-in hood comprising a hollow suction body (10) with a one-piece cone (12) provided with a flue (17) in a top section (16) and a fan (40) adapted to provide forced fluid transmission to the flue (17) in the cone (12). The hood comprising a flange (14) is provided on the lower edge of the conical portion (12) and a hollow skirt part (20) is attached from an upper part (23) to the flange (14) in a hermetically sealed manner such that elongating the lower end.

Description

A BUILT-IN HOOD WITH EXTENDED CASING

TECHNICAL FIELD

The invention relates to a built-in hood with a fan having a casing surrounding an air duct between a flue and an air inlet.

BACKGROUND OF THE ART

A built-in hood having a casing with a suction opening facing the cooking area is utilized for the evacuation of the steam formed during cooking and rising on the cooking area from the environment. The built-in hood has a casing enclosing a fan with a motor and surrounding an air duct that provides the connection between the intake nozzle and the exhaust flue. The fan is connected to the air duct from one end and directly to the flue from the other end, providing vacuum at the suction opening. When the blower operates, the fume generated during cooking is drawn to the suction opening with by the vacuum and directed from there to the air channel and is discharged from the environment with the flue. The vacuum created by the operation of the blower causes turbulence in the expanded suction mouth provided on the cooking area. Therefore, noise is generated in the cooking area during the operation of the hood.

W02016070710A1 describes a hood comprising a fume capture hood, a flue and a blower. The flow-guidance air channel is partitioned uniformly by flow-guidance baffles. The flow guiding air channel acts as an auxiliary guide. The air flow entering the hood flows towards the flue in accordance with the movement of the guiding channel. A flow-guidance cone is provided between an air outlet at the top portion of the fume capture hood and the blower. Double-layer construction is used to provide an enlarged air inlet. The air drawn by the deflection cone with the air inlet, the siphon hole and the guiding chamber enters the blower. Laminar gas flow is obtained to reduce noise in blower operation by preventing turbulence.

BRIEF DESCRIPTION OF THE INVENTION

The object of the invention is to reduce the fan noise in a built-in hood with a simple structural rectification. In order to reach above objective, invention relates to a built-in hood comprising a hollow suction body with a one-piece cone provided with a flue in a top section and a fan adapted to provide forced fluid transmission to the flue in the cone. The hob further comprising a flange is provided on the lower edge of the conical portion and a hollow skirt part is attached from an upper part to the flange in a hermetically sealed manner such that elongating the lower end. The skirt part can be optionally added to the cone and allows the cone to be extended downwards. Fan noise is reduced by increasing the suction body depth.

In a preferred embodiment of the invention, the upper part is in the form of a step aligned such that fits along the flange. By aligning the skirt part from the upper part to the flange, it is easily attached to the conical body. Preferably, the upper part is obtained by bending the skirt part completely or partially inward from the upper edge or by forming a step form in a plastic injection mold with a twist form.

In a preferred embodiment of the invention, the flange is formed by radial outward bending of the lower edge of the cone. In this way, it is ensured that the suction body has a flange itself for the skirt part connection. The flange obtained from a thin and flat sheet, for example, made of metal by cold forming or as a solid piece or from plastic has a high resistance to the stresses caused by the weight of the skirt part held by the flange.

In a preferred embodiment of the invention, the skirt part is in a form of a one-piece solid strip forming a flat side part aligned with the flange. In this way, it is possible to obtain a one-piece skirt part by bending and joining a simple sheet or forming the sheet by a mold operation such as deep drawing, or by injection or rotational molding of the plastic.

In a preferred embodiment of the invention, at least one fastening element attaches the upper part of the skirt part and the flange to each other in a removable way. The fastening element, for example a screw allows the skirt part to be attached to the cone when needed and simply removed when necessary.

In a preferred embodiment of the invention, the fastening element is having a screw passing through a hole aligned on the flange and the upper part. In this way, even after the suction body is mounted, the depth of the suction body can be increased by simply screwing the skirt part in alignment with the flange, and it can be disassembled by removing the screws when necessary. In a preferred embodiment of the invention, a strip-shaped rim extending outwardly delimiting an inlet along a lower edge of the skirt part. The rim allows the built-in hood to be disposed in the opening in the furniture in a sealed manner by supporting from the inside.

In a preferred embodiment, the rim is integrated into the lower edge of the skirt part. In this way, structural integrity is ensured and a form resistant to factors such as fan-induced vibration is obtained.

In a preferred embodiment of the invention, the fan is aligned in the middle of the top section of the suction body. In this way, evenly dispersed vacuum vectors are created in the opening and turbulence is reduced even at high flow rates.

In a preferred embodiment of the invention, the inlet opening of the skirt part is set wider than the opening of the suction body delimited by the flange. In this case, when the skirt part is installed, the inlet area is larger than the inlet area formed along the lower edge of the conical section, and since the air inlet velocity decreases for the same flow rate provided by the fan, laminar flow is obtained and the hood operates more quietly.

In a preferred embodiment of the invention, a tab and a slot through which the tab fits are mutually provided between the skirt part and the flange. In order to attach the skirt part to the suction body, the tab and the slot are simply aligned and the tab is placed in the slot by moving upwards. In a preferred embodiment, the tab is placed in the slot in such a way as to hold the flange from its upper part. In a possible embodiment, it can be designed in pin form only to provide an alignment function.

In a preferred embodiment of the invention, the tab is made of plastic injection molding on the skirt part. Thus, while the skirt part is produced by plastic injection molding, it is possible to form the plastic tab in a single operation.

BRIEF DESCRIPTION OF THE FIGURES

Figure 1 is a front view of a representative embodiment of the built-in hood of the subject matter invention.

Figure 2 is the A-A cross-sectional view of the built-in hood shown in Figure 1. Figure 3 is a disassembled perspective and enlarged view of the skirt part attached to the hood body.

Figure 4 is a cross-sectional view of the built-in hood shown in Figure 1 .

DETAILED DESCRIPTION OF THE INVENTION

In this detailed explanation, the invention is explained without any limitation and only with reference to examples to better explain the subject matter invention.

In Figure 1 , a suction body (10) of a built-in hood installed at a distance above a cooking zone (not shown) is schematically shown from the front. The suction body (10) in the form of a prismatic rhombic trapezoid made of one-piece. The narrow cut upper edge forms a flat top section (16). There is a flange (14) extending outwardly along the wide lower edge opposite the top section (16). There is a flue (17) in the middle of the top section (16), as can be seen in Figure 2 showing the section A-A'. The flue (17) is connected to the upper part of a radial fan (40) in such a way as to provide fluid transmission. A planar cone (12) extending from the top section (16) towards the flange (14) encloses the fan (40) from the outside. Thus, the cone (12) surrounds an air flow channel towards the flue (17). Multiple circular holes (15) are drilled on the flange (14) at a distance from each other. A skirt part (20) is having counter holes (22) aligned with the holes (15) of the flange (14) and an upper part (23) that fits the flange (14) extends the suction body (10) downwards from the lower part of the cone (12). It is mounted detachably by means of fasteners (30) in the form of screws passing through the holes (15, 22) from its end. The skirt part (20) is obtained by plastic shaping a flat and thin sheet with the same wall thickness as the conical section (12). The monolithic form of the skirt part (20) has an S-like stepped section. The protrusion in the upper part (23) has the same width as the flange (14) and rests on the flange (14) from the front face. A rim (25) surrounding an inlet opening (21 ) is obtained by bending vertically outward from the lower end with a flat and downwardly extending side part (24) which is obtained by the rotation of the upper part (23) at a right angle. The width of the inlet (21 ) is wider than the inlet delimited by the lower edge of the conical portion (12), as much as the flange (14). The upper part (23) expands outwardly by resting on the flange (14) from below and forms the widened inlet opening by reaching down vertically.

As shown in the enlarged view in Figure 3, the fastening elements (30) are inserted from the upper part of the flange (14) into the hole (15) and extend down to the corresponding hole suction body (10) without occupying space at the inlet (21). An airtight connection is obtained by the contact of the flange (14) and the upper part (23). A slot (18) located between the holes (15) in the flange (14) is in the form of a hole drilled from one side to the other. A tab (26) in the form of a protrusion extending upwards on the rim (25) of the skirt part (20) is inserted into the slot (18) in the assembly. In this way, during the assembly of the skirt part (20) to the suction body (10), the skirt part (20) is hung on the suction body (10) when the tab (26) passes through the slot (18) and fits on the upper wall of the flange (14). The tab (26) is formed directly on the rim (25) by plastic injection of the skirt part (20). The fan (40) extends vertically in the center of the cone (12) as shown in Figure 4. The air provided from the side of the fan (40) is discharged out of the flue (17) that provides the exhaust. The suction openings of the fan (40) facing the inner wall of the cone (12) ensure that the fume formed in the cooking area is drawn from the inlet (21 ). Steam hits the stage formed by the upper part (23), and reaches the fan (40) from the narrowed area on the inner wall of the cone (12). It is possible to easily disassemble the skirt part (20) by removing the fasteners (30) and separating it from the flange (14). In this case, the lower edge of the cone (12) delimited by the flange (14) forms the air inlet. The depth of the suction body (10) decreases, and since the inlet area narrows, turbulence and noise increase as the speed of the air at the inlet increases for the same flow rate. The depth of the suction body (10) increases after the skirt part (20) is simply mounted to the flange (14) by means of the fastening element (30). In this way, the distance traveled by the air in the hood increases and since the area of the inlet opening (21 ) increases, the turbulence is reduced by decreasing the speed of the air at the inlet for the same flow rate. In this way, the noise generated by the hood when the fan (40) operates is reduced. The assembly of the skirt part (20) to the suction body (10) can be completed by the flange (14) with the help of a screw, or in alternative embodiments, it is possible to use a snap-fit that can be adjusted to be removable as the fastening element (30).

REFERENCE NUMBERS

10 Suction body 20 Skirt part

12 Cone 21 Inlet port

14 Flange 22 Hole

15 Hole 23 Upper part

16 Top section 24 Side part

17 Flue 25 Frame

18 Slot 26 Tab

30 Fastener

Claims

1- A built-in hood comprising a hollow suction body (10) with a one-piece cone (12) provided with a flue (17) in a top section (16) and a fan (40) adapted to provide forced fluid transmission to the flue (17) in the cone (12) characterized in that a flange (14) is provided on the lower edge of the conical portion (12) and a hollow skirt part (20) is attached from an upper part (23) to the flange (14) in a hermetically sealed manner such that elongating the lower end.

2- A built-in hood according to claim 1 , wherein the upper part (23) is in the form of a step aligned such that fits along the flange (14).

3- A built-in hood according to any one of the preceding claims, wherein the flange (14) is formed by radial outward bending of the lower edge of the cone (12).

4- A built-in hood according to any of the preceding claims, wherein the skirt part (20) is in a form of a one-piece solid strip forming a flat side part (24) aligned with the flange (14).

5- A built-in hood according to any one of the preceding claims, wherein at least one fastening element (30) attaches the upper part (23) of the skirt part (20) and the flange (14) to each other in a removable way.

6- A built-in hood in accordance with Claim 5, wherein the fastening element (30) is having a screw passing through a hole (15, 22) aligned on the flange (14) and the upper part (23).

7- A built-in hood according to any one of the preceding claims, wherein a strip-shaped rim (25) extending outwardly delimiting an inlet (21 ) along a lower edge of the skirt part (20).

8- A built-in hood according to claim 7, wherein the rim (25) is integrated into the lower edge of the skirt part (20).

9- A built-in hood according to any of the preceding claims, wherein the fan (40) is aligned in the middle of the top section (16) of the suction body (10).

10- A built-in hood according to any of the preceding claims, wherein the inlet opening (21) of the skirt part (20) is set wider than the opening of the suction body (10) delimited by the flange (14). 11- A built-in hood according to any one of the preceding claims, wherein a tab (26) and a slot (18) through which the tab (26) fits are mutually provided between the skirt part (20) and the flange (14).

12- A built-in hood according to claim 11 , wherein the tab (26) is made of plastic injection molding on the skirt part (20).