Atmospheric steamer

• US 6,602,530 B1
• Filed: 11/03/2000
• Issued: 08/05/2003
• Est. Priority Date: 11/03/2000
• Status: Active Grant

• Current Assignee: Premark FEG LLC (Illinois Tool Works Inc.)
• Original Assignee: Premark FEG LLC (Illinois Tool Works Inc.)
• Inventors: Saksena, Atul, Weber, Matthew A., Wildman, Andrew E.
• Primary Examiner(s): Hendricks, Keith
• Assistant Examiner(s): BECKER, DREW E
• Application Number:
  US09/706,476
• Time in Patent Office: 1,005 Days
• Field of Search: 993/30, 993/33, 994/03, 994/44, 994/46, 994/47, 994/81, 994/68, 426/233, 426/510, 426/511, 426/523, 126/369
• US Class Current: 426/233
• CPC Class Codes: A47J 2027/043 for cooking food in steam
• CPC Class Codes: A47J 27/04 for cooking food in steam; Devices for extracting fruit juice by means of steam ; Vacuum cooking vessels steam-heated vessels for hotels, restaurants or canteens A47J27/16
• CPC Class Codes: A47J 27/14 Cooking-vessels for use in hotels, restaurants, or canteens

Abstract

An atmospheric steamer includes a steam chamber defined at least in part by a housing, and a water retaining area having at least one associated heating element for heating the water to generate steam. A vent opening is provided through the housing. A steam diverting baffle may be positioned around the vent opening to define a passage which leads to the vent opening. A sensor may be positioned along a vent path from the vent opening for sensing passage of steam along the vent path.

Claims

1. An atmospheric steamer, comprising:

a steam chamber defined at least in part by a housing;

a water retaining area including at least one associated heating element for heating the water to generate steam which is provided to the steam chamber;

a vent opening through the housing;

a steam diverting baffle positioned around the vent opening to define a passage which leads to the vent opening, the baffle defining a passage opening for permitting steam to migrate towards the vent opening along the passage, the passage opening positioned to force steam to turn before proceeding toward the vent opening, the passage including at least one drainage outlet for permitting steam which condenses in the passage to pass back to the water retaining area for further heating.

2. The atmospheric steamer of claim 1 wherein the vent opening is positioned toward a lower portion of the passage, the passage opening is defined by an upper portion of the baffle such that steam is forced to turn downward, and the drainage outlet is located toward a lower portion of the passage.

3. The atmospheric steamer of claim 1 wherein the water retaining area is defined by a bottom of the steam chamber, the passage opening being spaced from the water retaining area.

4. The atmospheric steamer of claim 1 wherein a height of the baffle is at least one third a height of the steam chamber and wherein a width of the baffle is at least one fourth a height of the baffle.

5. The atmospheric steamer of claim 4 wherein the width of the baffle is at least one half the height of the baffle.

6. The atmospheric steamer of claim 4 wherein a spacing between the inner surface of the baffle and a cavity wall is no more than 0.5 inches.

7. The atmospheric steamer of claim 1 wherein a flow area of the passage is greater than or equal to an area defined by the vent opening.

8. The atmospheric steamer of claim 1, further comprising:

a vent tube having a first end associated with the vent opening and a second end for venting gases passing therethrough;

a sensor positioned along the vent tube for sensing the passage of steam along the vent tube; and

a controller for receiving an output from the sensor and for controlling the heating element, the controller operable during a steaming operation to effect water heating responsively to the output received from the sensor.

9. The atmospheric steamer of claim 8 wherein the sensor comprises a temperature sensor and water heating is stopped when a temperature in the vent tube reaches a threshold temperature indicative of steam exiting through the vent tube, and wherein water heating is again initiated when the temperature in the vent tube falls below the threshold temperature by a predetermined amount.

10. The atmospheric steamer of claim 9 wherein the threshold temperature is adjustable.

11. The atmospheric steamer of claim 9 wherein the threshold temperature is between 196°

F. and 204°

F. and wherein the predetermine amount is between 2°

F. and 5°

F.

12. The atmospheric steamer of claim 9 wherein the threshold temperature is about 200°

F. and the predetermined amount is about 3°

F.

13. An atmospheric steamer, comprising:

a steam chamber defined at least in part by a housing;

a water retaining area including at least one associated heating element for heating the water to generate steam which is provided to the steam chamber;

a vent opening through the housing which leads to a vent passage for venting gases from the steam chamber;

a sensor positioned along the vent passage for sensing the passage of steam along the vent passage; and

a controller for receiving an output from the sensor and for controlling the heating element, the controller operable during a steaming operation to effect water heating responsively to the output received from the sensor; and

a steam diverting baffle positioned around the vent opening to define a passage which leads to the vent opening, the baffle defining a passage opening for permitting steam to migrate towards the vent opening along the passage, the passage opening positioned to force steam to turn downward before proceeding toward the vent opening, the passage including at least one drainage outlet for permitting steam which condenses in the passage to pass back to the water retaining area for further heating.

14. A method of atmospheric steaming, the method comprising the steps of:

(a) positioning a baffle within a steam chamber about a vent opening of the steam chamber to define a passage for causing steam to turn downward en route to the vent opening;

(b) condensing steam in the passage producing condensate;

(c) providing at least one drain outlet along the passage;

(d) returning condensate to a water heating area of the steam chamber through the drain outlet.

15. The method of claim 14 comprising the further steps of:

(e) providing a heating element for heating water to generate steam;

(f) sensing a passage of steam along a vent path which extends from the vent opening; and

(g) controlling water heating by the heating element according to the sensed steam passage.

16. The method of claim 15 wherein step (f) involves sensing a temperature along the vent path and step (g) involves (i) effecting water heating until the sensed temperature rises to a first threshold temperature indicative of steam exiting along the vent path, (ii) stopping water heating when the sensed temperature reaches the first threshold temperature, and (iii) effecting water heating when the sensed temperature falls to a second threshold temperature which is less than the first threshold temperature.

17. The method of claim 14 wherein steps (g)(i), (ii) and (iii) are repeated for a set time period.