# US 10,477,867 B2 · Oven appliance with air curtain

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- Number: US 10,477,867 B2
- Document ID: US10477867B2
- Status: Granted
- Kind: B2
- Application number: 15/218,143
- Filed: 2016-07-25
- Published: 2018-01-25
- Granted: 2019-11-19
- Earliest claimed: 2016-07-25
- Assignees: Haier US Appliance Solutions, Inc.
- Applicants: Haier US Appliance Solutions, Inc.
- Inventors: Stephen Bernard Froelicher; Kevin Farrelly Nolan; Christopher James Adelmann
- Web page: https://patentgrep.com/patent/US10477867B2

## CPC

- A21B 3/02: Doors; Flap gates
- A21B 1/26: by hot air
- A21B 5/00: Baking apparatus for special goods; Other baking apparatus
- F24C 15/025: {with air curtain closures}
- A21B: BAKERS' OVENS; MACHINES OR EQUIPMENT FOR BAKING (domestic baking equipment A47J37/00)
- F24C: DOMESTIC STOVES OR RANGES (exclusively for solid fuels F24B); DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION

## Abstract

An oven appliance includes a cooking chamber disposed within a housing with an opening in the housing for accessing the chamber. A casing is disposed around the opening, and the casing includes an air curtain outlet configured to prevent smoke and other vapors from escaping the cooking chamber to the ambient atmosphere via the opening.

## Claims

### Claim 1

An oven appliance defining a vertical direction, a lateral direction, and a transverse direction, the vertical, lateral, and transverse directions being mutually perpendicular, the oven appliance comprising:
a housing defining a cooking chamber, the cooking chamber extending between a top portion and a bottom portion along the vertical direction, the housing also defining an opening for accessing the cooking chamber of the housing, the cooking chamber extending from the opening to a wall along the transverse direction;
an upper heating element array positioned within the housing at the top portion of the cooking chamber;
a baking stone positioned within the housing at the bottom portion of the cooking chamber;
a lower heating element array positioned within the housing below the baking stone adjacent the bottom portion of the cooking chamber;
a duct at least partially defined by the wall and extending between an inlet defined in the wall below the baking stone and an outlet defined in the wall above the upper heating element array;
a hollow casing mounted to the housing at the opening of the housing, the hollow casing defining a lower portion and an upper portion spaced apart from the lower portion along the vertical direction, the hollow casing comprising an ambient air intake in the lower portion proximate to and contiguous with interior room ambient atmosphere about the housing, a smoke inlet proximate to and contiguous with the cooking chamber, a venting exit in the upper portion proximate to and contiguous with the interior room ambient atmosphere about the housing, and an air curtain outlet proximate to the opening of the housing, wherein the oven appliance defines a first air flow path from the lower portion of the hollow casing to the upper portion of the hollow casing via the duct and a second air flow path from the lower portion of the hollow casing to the upper portion of the hollow casing via a side portion of the hollow casing; and
an air handler located within the hollow casing and operable to cause gases to flow into the ambient air intake and the smoke inlet, such that the gases from each of the ambient air intake and the smoke inlet intermix within the hollow casing and the mixed gases flow to the venting exit and to the air curtain outlet;
wherein the opening of the housing defines a width along the lateral direction, the air curtain outlet also defining a width along the lateral direction, the width of the air curtain outlet being substantially equal to the width of the opening.

### Claim 2 (depends on 1)

The oven appliance of claim 1, further comprising a smoke reduction catalyst positioned at the smoke inlet.

### Claim 3 (depends on 1)

The oven appliance of claim 1, wherein the air curtain outlet is oriented downward along the vertical direction from a top portion of the hollow casing towards a lower portion of the hollow casing so as to form an air curtain extending vertically across the opening of the cooking chamber during operation of the air handler.

### Claim 4 (depends on 1)

The oven appliance of claim 1, wherein the air curtain outlet is oriented back along the transverse direction from the hollow casing towards the cooking chamber so as to form an air curtain preventing vapors from escaping the cooking chamber to the ambient atmosphere via the opening.

### Claim 5 (depends on 1)

The oven appliance of claim 1, wherein the air curtain outlet defines a thickness along the transverse direction, the thickness being much less than the width of the air curtain outlet.

### Claim 6 (depends on 1)

The oven appliance of claim 1, further comprising a reflector positioned above the upper heating element array, wherein the wall is positioned opposite of the opening and the outlet of the duct is positioned above the reflector, wherein the smoke inlet is in fluid communication with the outlet of the duct above the reflector.

### Claim 7 (depends on 1)

The oven appliance of claim 1, further comprising a hook-shaped recirculating duct located proximate to the venting exit, the hook-shaped recirculating duct extending to the air curtain outlet.

### Claim 8 (depends on 1)

The oven appliance of claim 1, wherein the smoke inlet is also in fluid communication with the opening and the cooking chamber.

### Claim 9

An oven appliance defining a vertical direction, a lateral direction, and a transverse direction, the vertical, lateral, and transverse directions being mutually perpendicular, the oven appliance comprising:
a housing defining a cooking chamber, the cooking chamber extending between a top portion and a bottom portion along the vertical direction, the housing also defining an opening for accessing the cooking chamber of the housing, the cooking chamber extending from the opening to a wall along the transverse direction;
an upper heating element array positioned within the housing at the top portion of the cooking chamber;
a reflector positioned above the upper heating element array;
a baking stone positioned within the housing at the bottom portion of the cooking chamber;
a lower heating element array positioned within the housing below the baking stone adjacent the bottom portion of the cooking chamber;
a duct extending from an inlet defined in the wall below the baking stone to an outlet defined in the wall above the reflector; and
a hollow casing defining a lower portion, an upper portion, one or more side portions, and a plenum space within the hollow casing, the one or more side portions extending vertically between the lower portion and the upper portion, the hollow casing extending around the opening of the housing, the lower portion of the casing comprising a plurality of air intakes contiguous with the interior room ambient atmosphere about the housing, the hollow casing defining a first air flow path from a first set of the air intakes, through the plenum space, and to the upper portion of the casing via the cooking chamber, the hollow casing also defining a second air flow path from a second set of the air intakes to the upper portion of the casing through the plenum space via the one or more side portions providing relatively fresh, cool air to the upper portion, the upper portion further comprising a venting exit contiguous with the interior room ambient atmosphere about the housing and an air curtain outlet, the plenum space within the hollow casing also defining a confluence of the first air flow path and the second air flow path in the upper portion upstream of the venting exit and the air curtain outlet such that the confluent air can flow out of the upper portion via the venting exit and the air curtain outlet;
wherein the opening of the housing defines a width along the lateral direction, the air curtain outlet also defining a width along the lateral direction, the width of the air curtain outlet being substantially equal to the width of the opening, and wherein the first air flow path extends from the lower portion of the casing through the duct to the upper portion of the casing.

### Claim 10 (depends on 9)

The oven appliance of claim 9, further comprising a hook-shaped recirculating duct configured to divert a portion of the confluent air from the venting exit to the air curtain outlet.

### Claim 11 (depends on 9)

The oven appliance of claim 9, further comprising a smoke reduction catalyst positioned between the top portion of the cooking chamber and the upper portion of the casing.

### Claim 12 (depends on 9)

The oven appliance of claim 9, wherein the air curtain outlet extends downward along the vertical direction towards the lower portion of the casing so as to form an air curtain extending vertically across the opening of the cooking chamber preventing vapors from escaping the cooking chamber to the ambient atmosphere via the opening.

### Claim 13 (depends on 9)

The oven appliance of claim 9, wherein the air curtain outlet extends back along the transverse direction from the hollow casing towards the cooking chamber so as to form an air curtain preventing vapors from escaping the cooking chamber to the ambient atmosphere via the opening.

### Claim 14 (depends on 9)

The oven appliance of claim 9, wherein the air curtain outlet defines a thickness along the transverse direction, the thickness being much less than the width of the air curtain outlet to facilitate a calibrated air curtain velocity across the top of the opening.

### Claim 15 (depends on 9)

The oven appliance of claim 9, further comprising a third air flow path from the opening, through the plenum space, and to the upper portion of the casing via the cooking chamber.

### Claim 16 (depends on 15)

The oven appliance of claim 15, wherein the first air flow path and the third air flow path converge near the top portion of the cooking chamber upstream of the upper portion of the casing.