EP3438554A1

EP3438554A1 - Filtering device for a kitchen hood

Info

Publication number: EP3438554A1
Application number: EP18186738.3A
Authority: EP
Inventors: Jo e KATANEC; Boris Jurko ek; Toma KRAJNC; Borut MATKO; Erik SCHAKEL; Chris DE NIET
Original assignee: Gorenje gospodinjski aparati dd
Current assignee: Gorenje gospodinjski aparati dd
Priority date: 2017-08-03
Filing date: 2018-08-01
Publication date: 2019-02-06
Anticipated expiration: 2038-08-01
Also published as: SI25498A; EP3438554C0; EP3438554B1

Abstract

The present invention refers to a kitchen hood, comprising a collecting section with a filtering device inserted therein, wherein the filtering device comprises a filtering panel made of a filtering material arranged in a support frame, and wherein the hood further comprises a plurality of pivotable louvres associated with said support frame, in order to at least partially cover said panel of filtering material. Said directing device (7) comprises a directing frame (13) in which louvres (7') are disposed at an inclination angle (α) with respect to a plane of the directing device (7), said louvres (7') being pivotable about its longitudinal axis which is in essence parallel with a filtering panel (6), and in which directing walls (18) are disposed at an inclination angle (β) with respect to the plane of the directing device (7).

Description

The present invention refers to a kitchen hood, comprising a collecting section with a filtering device inserted therein, wherein the filtering device comprises a filtering panel made of a filtering material arranged in a support frame, and wherein the hood further comprises a plurality of pivotable louvres associated with said support frame, in order to at least partially cover said panel of filtering material.
The kitchen hood of the aforementioned kind is known from the patent document No. EP 2 966 363 B1 and comprises a collecting section with a filtering device inserted therein, the latter having a panel made of a filtering material placed in a support frame, an intake duct with an inlet located above said panel made of the filtering material, a gas extractor located in said duct, the suction port of said gas extractor facing a first portion of said panel made of the filtering material, and a second section of said panel made of the filtering material can be reached by suction of said gas extractor via a channel arrangement. The know kitchen hood further comprises a plurality of louvres having a predetermined direction of extension and associated with said support frame to overlap said portion of the filtering panel, each louver of said plurality of louvres being movable about its own axis Y-Y relative to said support frame to pivot between a position in which it is substantially parallel to the surface of the portion of the filtering panel that faces the suction port of the extractor, such that its inclined position is a function of the amount of such suction.
Since said louvres cover entirely said first section of the filtering panel, a uniform flow of the sucked air over all surfaces of the filtering panel is not ensured. In particular, said drawback occurs in case when the driving motor of the gas extractor operates with non-constant rotational frequency.
It is the object of the present invention to create a filtering device of a kitchen hood, which provides for air suction as uniform as possible over the entire surfaces of a filtering panel.
According to the present invention, the object as set above is solved by features set forth in the characterising part of claim 1. Detail of the invention is disclosed in respective subclaims.
The invention is further described in detail by way of non-limiting embodiment, and with a reference to the accompanying drawings, where

Fig. 1: shows a kitchen hood in a three-dimensional partial cross-section view in a vertical plane;
Fig. 2: shows a filtering device viewed in direction of the arrow II of fig. 1;
Fig. 3: shows a three-dimensional exploded view of a directing device;
Fig. 4: shows a view from above of the directing device;
Fig. 5: shows a partial view of the directing device in direction of the arrow V of Fig. 3.

A kitchen hood 1 comprises a suction channel 2, which generally extends in vertical direction, and a collecting section 3, which is associated with the lower end of the suction channel 2. The collecting section 3 comprises at the side averted from the connection with the suction channel 2 at least one filtering device 4.
Said at least one filtering device 4 comprises a support frame 5, a flat filtering panel 6 being inserted or is comprised therein, said filtering panel 6 covers the entire inner region of the support frame 5. Said filtering panel 6 can comprise at least one metal mesh element and/or an active coal mesh element and/or a polyurethane mesh element. Furthermore, the side of the filtering device 4 facing the suction channel 2 is provided with at least one directing device 7 formed by means of a plurality of louvres 7' in a manner of the Venetian blind, each said louvre 7' being rotatable about its longitudinal axis.
The hood 1 further comprises a suction means 8 with a driving motor arranged in the suction channel 2 and in the region above the collecting section 3. Said suction means 8 arranged in the immediate vicinity of the directing device 7 and approximately centric above the latter, for example, transports evacuated gases and grease through a line 9 arranged in the suction channel 2 in a manner known per se.
It is provided for, according to the present invention, that the dimensions of said directing device 7 are smaller, when viewed in area, than the dimensions of the filtering device 4. It is provided for, according to the preferred embodiment, that between at least one section of a rim of the support frame 5 of the filtering device 4 and at least one section of a rim of the directing device 7 there is provided a space 10, which represents a free area of the filtering panel 6, the surface not covered by the directing device 7 that is. With the preferred embodiment, the space 10 and, respectively, said free area of the filtering panel 6, that is not covered by the directing device 7, are both provided at least over a part of the outside circumference and, respectively, along at least one outer side of the collecting section 3. With the even more preferred embodiment the space 10 and, respectively, said area of the filtering panel 6, that is not covered by the directing device 7, are both provided along the two outher flanks as well as along the front side of the collecting section 3 facing a user. It is also possible, according to the present invention, that the space 10 and, respectively, said area of the filtering panel 6, that is not covered by the directing device 7, are both provided along the enitre outher rim of the collecting section 3.
All of the aforementioned is true in case when the kitchen hood 1 and, respectively, the collecting section 3 thereof is formed as a polygon, most commonly as a rectangular, when viewed in the horizontal plane. It is obvious, however, if the kitchen hood 1 and, respectively, the collecting section 3 thereof, when viewed in the horizontal plane, is formed differently, as a circle, an ellipse and similar, for instance, that the space 10 and, respectively, said area of the filtering panel 6, that is not covered by the directing device 7 are both provided over at least a part of the respective rim of the collecting section 3.
Said directing device 7 comprises a support frame 11 which is fixed by means of a first plurality of guide projections 12 and movable in a first direction Y in said support frame 5 of the filtering device 4. Said first plurality of the guide projections 12 can be formed on the support frame 11 of the directing device 7 or on the support frame 5 of the filtering device 4. In any case, the opposite side is formed with respective guides for receiving said first plurality of the projections 12.
Furthermore, a directing frame 13 is disposed in said support frame 11 of the directing device 7, said directing frame 13 being held and movable in a second direction X in said support frame 11 of the directing device 7. Said second direction X extends approximately perpendicular to said first direction Y. According to the present invention is provided that said directions X, Y lie in the horizontal plane and, respectively, in the plane of the filtering panel 6. Said holding and/or moving of the directing frame 13 is attained by means of a second plurality of guide projections 14 formed either on the support frame 11 of the directing device 7 or on said directing frame 13. In any case, the opposite side is formed with respective guides to receive said second plurality of the projections 14.
It is provided for according to the present invention that one of the dimensions of the directing frame 13, preferably the dimension in said second direction X, is smaller than the dimension of the support frame 11 of the directing device 7 thus, it is enabled movement of the directing frame 13 in said respective direction inside said support frame 11, and, as a result thereof, creation of said space 10.
Moreover, according to the present invention is provided that one of the dimensions of the support frame 11 of the directing device 7, preferably the dimension in said direction Y, is smaller than the direction of the support frame 5 of the filtering device 4 thus, it is enabled movement of the support frame 11 in said respective direction inside said support frame 5, and, as a result thereof, creation of said space 10.
Said directing frame 13 is formed of a pair of mutually parallel sides 13'; 13", a first pair of mutually parallel sides 13' provided for sliding cooperation with said second plurality of the projections 14 of the support frame 11. Each side 13" from a second pair of mutually parallel sides 13" is formed, in a sense of saw blade, with a plurality of approximately triangularly shaped teeth 15, the free flanks 16 and, respectively, 17 thereof are set at an angle α and, respectively, β with respect to the general horizontal extension of the filtering device 4. Each tooth 15 of the first side from the pair of mutually parallel sides 13" is associated in the region of its first flank 16 by means of a directing wall 18 with the region of the first flank 16 of the opposite tooth 15 of the second side from the pair of mutually parallel sides 13". Said directing wall 18 preferably resembles equal inclination and, respectively, equal angle α with respect to the general horizontal extension of the filtering device 4 as said free flank 16 of the tooth 15.
Said louvre 7' is disposed between each tooth 15 of the first side from the pair of mutually parallel sides 13" and each opposite tooth 15 of the second side from the pair of mutually parallel sides 13", the louvre 7' being in a manner known per se pivotally arranged in the region of each tooth 15. It is provided according to the present invention that the louvre 7' abuts against said second flank 17 of each tooth 15, wherein said louvre preferably resembles equal inclination and, respectively, equal angle β with respect to the general horizontal extension of the filtering device 4 as said free flank 17 of the tooth 15.
Said louvre 7' preferably comprises a suitable aerodynamic cross-section thus, reacting positively to the air flow though the louvres. Furthermore, it is provided according to the present invention that the louvres 7' comprise mutually equal or different cross-section. Said louvres 7' can comprise equal or variable cross-section along the longitudinal extension thereof. Moreover, the louvres 7' comprise mutually equal or different mass, which is obtained, for example, by means of using different materials for each of the louvres 7', entering one or more cavities in each louvre 7', and similar.
Said inclination angle α of the first flank 16 with respect to the general horizontal extension of the filtering device 4 is preferably, but not necessary, greater than said inclination angle β of the second flank 17. Said angles α and β in essence depend on the distance of each pivotable louvre 7' and, respectively, each tooth 15 from the suction aperture of the suction means 8 and/or from the size of the cross-section of each louvre 7' and/or from the mass of each louvre 7'. The further is the louvre 7' arranged from the suction means 8 the greater is the inclination angle β of the second flank 17 and, respectively, the lower is the mass of the louvre 7'. In any case, said inclination angle α and, respectively, β of said flanks 16 and, respectively, 17 is greater that approximately 45°.
Moreover, it is provided for, according to the present invention, that the height H of the teeth 15 can be mutually equal or different, such as gradually decreasing and, respectively, increasing, and similar. Even further it is provided that the length L between the two neighbouring teeth 15 is either equal or different.
Said angle α and, respectively, β and/or said parameter H and, respectively, L can be additionally influence the time and, respectively, the speed of lifting each louvre 7' with respect to the distance thereof from the suction means, wherein the time and, respectively, the speed of lifting are both result of the suction effect of the suction means 8.

Claims

A filtering device of a kitchen hood, a support frame, a flat filtering panel being inserted or is comprised therein, said filtering panel covers the entire inner region of the support frame, where the side of the filtering device facing the suction channel is provided with at least one directing device formed by means of a plurality of louvres in a manner of the Venetian blind, each said louvre being rotatable about its longitudinal axis, characterized in that said directing device (7) comprises a directing frame (13)
in which louvres (7') are disposed at an inclination angle (α) with respect to a plane of the directing device (7),
said louvres (7') being pivotable about its longitudinal axis which is in essence parallel with a filtering panel (6),
and
in which directing walls (18) are disposed at an inclination angle (β) with respect to the plane of the directing device (7),
said directing walls (18) extending parallel with the louvres (7').
A filtering device according to claim 2, characterized in that said directing device (7) comprises a support frame (11), which is fixed by means of a first plurality of guide projections (12) and movable in a first direction in said support frame (5) of the filtering device (4).
A filtering device according to any of claims 1 and 2, characterized in that a directing frame (13) is disposed in said support frame (11) of the directing device (7), said directing frame (13) being held and movable in the second direction in said support frame (11) of the directing device (7) by means of a second plurality of guide projections (14).
A filtering device according to claim 3, characterized in that said second direction extends approximately perpendicular to said first direction, said first direction and said second direction both lie in the horizontal plane and, respectively, in the plane of the filtering panel (6).
A filtering device according to any of the preceding claims, characterized in that said first plurality of guide projections (12) is formed on the support frame (11) of the directing device (7) or on the support frame (5) of the filtering device (4).
A filtering device according to any of the preceding claims, characterized in that said second plurality of projections (14) is formed on the support frame (11) of the directing device (7) or on said directing frame (13).
A filtering device according to any of the preceding claims, characterized in that said louvres (7') preferably comprise aerodynamic cross-section.
A filtering device according to any of the preceding claims, characterized in that the louvres (7') comprise mutually equal or mutually different cross-section.
A filtering device according to any of the preceding claims, characterized in that the louvres (7') comprise along its longitudinal extension equal or different cross-section.
A filtering device according to any of the preceding claims, characterized in that the louvres (7') comprise mutually equal or mutually different mass.
A filtering device according to claim 15, characterized in that different mass of the louvres (7') is obtained by means of using different materials for each of the louvres 7', entering one or more cavities in each louvre 7', and similar.
A filtering device according to any of the preceding claims, characterized in that said inclination angle (α) of each louvre (7') is preferably greater than said inclination angle (β) of each directing wall (18), wherein said inclination angle (α; β) is greater than approximately 45°.
A filtering device according to any of the preceding claims, characterized in that a space (10) is provided between at least one section of a rim of the support frame (5) of the filtering device (4) and at least one section of a rim of the directing device (7), said space (10) representing a free area of the filtering panel (6), the surface not covered by the directing device (7) that is, wherein the space (10) and, respectively, said free area of the filtering panel (6) not covered by the directing device (7), are both provided at least over a part of the respective circumference of a collecting section (3).
A filtering device according to any of the preceding claims, characterized in that the space (10) and, respectively, said surface of the filtering panel (6) not covered by the directing device (7) is provided at least along a part of the outer rim and, respectively along at least one outer side of the collecting section (3).
A filtering device according to any of the preceding claims, characterized in that the space (10) and, respectively, said surface of the filtering panel (6) not covered by the directing device (7) is provided along both outer sides and along a front side facing a user of the collecting section (3).
A filtering device according to any of the preceding claims, characterized in that the space (10) and, respectively, said surface of the filtering panel (6) not covered by the directing device (7) is provided along the entire outer circumference of the collecting section (3).
A kitchen hood, characterized in that it comprises at least one filtering device (4) according to any of the preceding claims.