KITCHEN RANGE HOOD
A kitchen range hood having an improved connection as between the range hood body and the exhaust chamber housing. The range hood body has a top panel and defines an enclosure in which the exhaust chamber housing is mounted. The housing has a peripheral wall terminating in a flange at one end and a bottom surface at the other. The flange is connected to the top panel. A pocket between the flange and the top panel is filled with a seal.
This invention relates to kitchen range hoods. In particular, this invention relates to the mounting of an exhaust chamber housing within a range hood body and the connection between the two.
BACKGROUND OF THE INVENTIONKitchen range hoods are used for venting gases from above a cooking surface. The body of a kitchen range hood typically comprises a top panel, two side panels, a rear panel and a bottom panel to accommodate one or more air intakes and fan grills. The panels are generally joined at their edges by welding and form an enclosure.
An exhaust chamber housing is mounted within the hood body. At least one motor and one fan are mounted within the exhaust chamber for venting gases drawn in through the air intake(s) and expelled through an exhaust vent to an exterior location. During the process of venting grease-laden air, grease accumulates on the inside of the exhaust chamber.
At its most basic, the exhaust chamber is defined by the top panel of the range hood body and the sides and bottom of the exhaust chamber housing. This exhaust chamber configuration for range hoods is taught in U.S. Pat. Nos. 5,228,428 and 5,537,988.
For ease of reference, this type of prior art design is shown in
The exhaust chamber housing 46 is connected to the top panel 44 of the range hood, preferably by welding flange 48 to top panel 44. While the welded junction between the exhaust housing 46 and top panel 44 is sufficient from the standpoint of structural connectivity, achieving a suitable seal between the flange 48 and the top panel 44 is difficult. The lack of a sufficient seal results in poor ventilation—with gases to be vented from the exhaust chamber 45 instead passing through the junction between flange 48 and top panel 44 into the range hood interior 41. This reduces the efficiency of the range hood. In addition, accumulated grease within interior 41 is hard to get at in order to clean the interior. This connection is especially ineffective in those range hoods having cleaning systems where cleaning fluid is injected into the exhaust chamber in order to flush out any accumulated grease. The pressure of the fluid itself and the added force from the spinning fan cause fluid and grease to pass through any openings between the flange 48 and the top panel 44 leaking out into the range hood interior 41 contaminating it.
Different designs have been developed in order to overcome the problems associated with an ineffective connection between the exhaust chamber housing and the top panel of the range hood body. One such design is a range hood having a fully enclosed exhaust chamber housing having top, bottom and side surfaces. An example of this type of range hood is disclosed in U.S. Pat. No. 6,732,729. The motor housing of the '729 patent is formed of two halves, a top half and a bottom half. The two halves are joined together in such a fashion that no liquid can pass between the connection. While the range hood of the '729 patent overcomes the problem of undesirable leakage of fluid out of the exhaust chamber, it is more costly to make as it requires increased materials as compared to the exhaust chamber of the prior art range hood shown in
A further design is taught in U.S. Pat. No. 6,719,622. In the '722 patent, the range hood (or smoke exhaust structure as it is described therein) has an exhaust chamber formed of two part construction, comprising a first face connected to the hood body and a wind chamber releasably connectable to the first face. The wind chamber has a peripheral wall and a second face (a bottom) opposite the first face. The top edge of the peripheral wall fits into a channel in the first face and the wind chamber is latched to the first face. Once again, the problem of undesirable leakage of fluid between the connection between the top panel of the range hood body and the exhaust chamber is overcome by adding a top surface to the exhaust chamber so as to have a fully enclosed exhaust chamber mounted within the range hood enclosure. As above, this design is more costly to make as it requires increased materials as compared to those range hoods having a “topless” exhaust chamber housing connected directly to the top panel of the range hood.
Accordingly, there is an ongoing need for a range hood having an improved connection between the motor housing and the range hood while minimizing the amount of material used.
This and other objects of the invention will be better understood by reference to the detailed description of the preferred embodiment which follows.
SUMMARY OF THE INVENTIONAccording to the present invention there is provided a kitchen range hood comprising a hood body having a top panel and defining an enclosure and having an exhaust chamber housing mounted within the hood body. The exhaust chamber housing has a peripheral wall terminating in a flange at one end and a bottom surface having at least one intake opening at the opposite end. The flange is connected to the top panel. A pocket is formed between the flange and the top panel, the pocket being filled with a seal.
In another aspect, the top panel has a raised portion within which the flange is seated.
In another aspect, the flange has a stepped portion defining the pocket. The stepped portion can be located at the outer end of the flange or proximal to the peripheral wall.
In another aspect, the flange has a recessed mid-portion defining the pocket.
In another aspect, the top panel has a raised portion defining the pocket.
The foregoing was intended as a broad summary only and of only some of the aspects of the invention. It was not intended to define the limits or requirements of the invention. Other aspects of the invention will be appreciated by reference to the detailed description of the preferred embodiment and to the claims.
BRIEF DESCRIPTION OF THE PREFERRED EMBODIMENTA detailed description of the preferred embodiment will be provided by reference to the drawings thereof and of the prior art, in which:
The preferred embodiment of a range hood 2 according to the invention is shown in
The exhaust chamber housing 6 and top panel 4 define an exhaust chamber 30 within which at least one motor 8 and fan 10 are mounted. The exhaust chamber housing has a perimeter side wall 7 terminating in an outwardly extending flange 5 at the top and terminating in a bottom surface 9 having at least one air intake opening defined therein. The intake opening in the exhaust chamber housing is aligned with the air intake defined in the bottom panel 14 of the range hood. A grease tray 12 is releasably connectable to the bottom surface 9 to capture any grease that may drip from the fan 10 after the motor 8 has been shut off and to improve air flow into the exhaust chamber through fan 8. A grill 16 is connected to the bottom panel 14 to prevent accidental contact with the fan when in operation. Grease within the exhaust chamber housing interior having sufficient liquidity drains towards a drain hole (not shown) at the bottom rear of the exhaust chamber housing and travels through conduit 18 to external grease receptacle 20 for disposal.
Referring now to
An o-ring 28 (suitably sized and dimensioned and adapted to be fitted in a potentially non-circular pocket, the exhaust chamber typically having a
Flange 5 is connected to top panel 4, preferably by welding. The welding of the connection according to the invention is preferably performed by a form of spot welding as is known in the art. A broad, flat electrode is used for the top of the connection, namely the raised portion 22 of the top panel 4 that overlies flange 5, while a point electrode is used on the bottom (hidden) surface of the connection. The use of a broad flat electrode on the top surface acts to distribute the current across the surface of the connection, while the point electrode concentrates the current. Preferably any silicone or other sealant to be used is injected after welding of the exhaust chamber housing 6 to the top panel 4.
By machining the top panel 4 to form raised portion 22, the structural rigidity of the top panel is increased. In addition, because raised portion 22 defines the recess 21 within which flange 5 is seated, it provides an easy reference for the initial placement of the exhaust chamber housing against top surface 4 during the manufacturing process. The seal provided by the o-ring 28 and/or sealant prevents the escape of any grease-laden gases, or cleaning fluid should it be injected into the exhaust chamber. Because the gap 32 is located on the exterior of the exhaust chamber housing 6, it provides easier access for the insertion of sealant.
Alternative connections between the exhaust chamber housing and the top panel of the range hood are shown in
In the alternative embodiment shown in
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The embodiments of the invention provide a seal as between the top panel of the range hood body and the exhaust chamber housing, thereby preventing the escape of grease-laden gases and fluids. Because the top panel forms the top of the exhaust chamber, the materials used are minimized.
The above description has been intended to illustrate the preferred and alternative embodiments of the invention. It will be appreciated that modifications and adaptations to such embodiments may be practiced without departing from the scope of the invention, such scope being most properly defined by reference to this specification as a whole and to the following claims.
Claims
1. A kitchen range hood comprising:
- a hood body having a top panel and defining an enclosure;
- an exhaust chamber housing mounted within said hood body, said housing having a peripheral wall terminating in a flange at one end and a bottom surface at the opposite end, said bottom surface having at least one intake opening;
- said flange being connected to said top panel; and
- a pocket between said flange and said top panel, said pocket being filled with a seal.
2. The kitchen range hood according to claim 1 wherein said flange is secured to said top panel by welding.
3. The kitchen range hood of according to claim 1 wherein said top panel having a raised portion.
4. The kitchen range hood of claim 3 wherein said flange is fitted within said raised portion of said top panel.
5. The kitchen range hood of claim 4 wherein said flange having a stepped portion defining said pocket.
6. The kitchen range hood of claim 5 wherein said seal comprises an o-ring seated in said pocket between said stepped portion and said top panel.
7. The kitchen range hood of claim 5 wherein said seal comprises a sealant injected into said pocket between said stepped portion and said top panel.
8. The kitchen range hood of claim 6 wherein said seal further comprises a sealant injected into said pocket between said stepped portion and said top panel.
9. The kitchen range hood of claim 4 further comprising a gap between said flange and said top panel opening into said pocket.
10. The kitchen range hood of claim 9 wherein said seal comprises a sealant injected into said pocket through said gap.
11. The kitchen range hood of claim 5 wherein said stepped portion of said flange is a downwardly stepped outer end defining said pocket between said flange and said top panel.
12. The kitchen range hood of claim 5 wherein said stepped portion of said flange is proximal to said peripheral wall.
13. The kitchen range hood of claim 4 wherein said flange having a recessed middle portion defining said pocket.
14. The kitchen range hood of claim 13 wherein said seal comprises an o-ring seated in said pocket formed by said recessed middle portion.
15. The kitchen range hood of claim 1 wherein said flange having a stepped portion defining said pocket.
16. The kitchen range hood of claim 15 wherein said seal comprises an o-ring seated in said pocket between said stepped portion and said top panel.
17. The kitchen range hood of claim 16 wherein said seal comprises a sealant injected into said pocket between said stepped portion and said top panel.
18. The kitchen range hood of claim 15 wherein said stepped portion of said flange is a downwardly stepped outer end defining said pocket between said flange and said top panel.
19. The kitchen range hood of claim 15 wherein said stepped portion of said flange is proximal to said peripheral wall.
20. The kitchen range hood of claim 1 wherein said flange having a recessed middle portion defining said pocket.
21. The kitchen range hood of claim 20 wherein said seal comprises an o-ring seated in said pocked formed by said recessed middle portion.
22. The kitchen range hood of claim 3 wherein said raised portion of said top panel defines said pocket between said top panel and said flange.
23. The kitchen range hood of claim 22 wherein said seal comprises an o-ring.
24. The kitchen range hood of claim 22 further comprising a gap between said top panel and said flange providing an opening to said pocket.
Type: Application
Filed: Jun 29, 2006
Publication Date: May 10, 2007
Inventor: Peter Yeung (Burnaby, BC)
Application Number: 11/427,342
International Classification: F24C 15/20 (20060101);