Steam cooker

• US 20090007797A1
• Filed: 07/28/2005
• Published: 01/08/2009
• Est. Priority Date: 08/03/2004
• Status: Abandoned Application

• Current Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Inventors: Ando, Yuji, Yamamoto, Yoshikazu, Kitaguchi, Yoshikazu
• Application Number:
  US11/659,095
• Publication Number:
  US 20090007797A1
• Time in Patent Office: Days
• US Class Current: 99/330
• CPC Class Codes: A21B 3/04 Air-treatment devices for ovens, e.g. regulating humidity
• CPC Class Codes: F24C 15/327 with air moisturising

Abstract

A controller monitors water temperature in a pot (41) through a water temperature thermistor in a temperature sensor (48) while a water level sensor is detecting the water level in the pot. When the water temperature in the pot exceeds 110° C., the controller determines that the water level thermistor in the water level sensor (43) cannot perform normal detection, and drives the pump (35) to supply water. When water supply based on the temperature detected by the water temperature thermistor is carried out more than three times, the controller determines that scale has deposited on the water level sensor (43), and notifies a user of a scale cleaning request. In this manner, in the case of detection failure of the water level thermistor, it is possible to notify a scale cleaning request at an appropriate time by determining whether or not the detection failure is attributable to scale deposits.

Claims

1. A steam cooker, comprising:

a steam generator (40) for heating and evaporating water to generate steam;

a heating chamber (20) in which an object (90) to be cooked is heated by steam supplied from the steam generator (40), said steam generator (40), including;

a pot (41) to which water is supplied;

a heater section (42) placed in the pot (41);

a water level sensor (43) placed in vicinity of an upper side of the heater section (42) and comprising a self-heating type temperature sensing device for outputting a temperature signal that represents a detected temperature; and

a water temperature sensor (48) placed in vicinity of the upper side of the heater section (42) and outputting a temperature signal that represents a detected temperature;

a pump (35) for supplying water to the pot (41); and

a water supply control section for controlling the pump (35) to perform water supply to the pot (41) when a water temperature based on the temperature signal from the water temperature sensor (48) exceeds a second predetermined temperature higher than a first predetermined temperature that is a water temperature when a water level in the pot (41) is normally detected according to changes in water temperature based on the detected temperature of the self heating type temperature sensing device (43).

2. The steam cooker according to claim 1, wherein

the water supply control section controls the pump (35) to stop water supply to the pot (41) when the water temperature based on the temperature signal from the water temperature sensor (48) reaches a third predetermined temperature lower than the second predetermined temperature or reaches the second predetermined temperature.

3. The steam cooker according to claim 1, wherein

the water supply control section controls the pump (35) to stop water supply to the pot (41) when a lapse time from start of the water supply reaches a predetermined time that is longer than a water supply time in performing water supply based on a water level detected by the water level sensor (43).

4. The steam cooker according to claim 1, comprising:

a heater turn-off section for stopping power supply to the heater section (42) when the water temperature based on the temperature signal from the water temperature sensor (48) exceeds a fourth predetermined temperature higher than the second predetermined temperature.

5. The steam cooker according to claim 1, comprising:

a water supply counting section for counting a number of times of water supply to the pot (41) by the water supply control section; and

a scale deposition determining section for determining that scale has deposited on the water level sensor (43) when a counted value of the number of times of the water supply satisfies a predetermined condition.

6. The steam cooker according to claim 5, wherein

the scale deposition determining section uses, as said predetermined condition, a condition that water supply to the pot (41) by the water supply control section is successively performed a first predetermined number of times or more.

7. The steam cooker according to claim 5, wherein

the scale deposition determining section uses, as said predetermined condition, a condition that water supply to the pot (41) by the water supply control section is performed a second predetermined number of times or more within a predetermined time.

8. The steam cooker according to claim 5, comprising:

a cleaning request signal output section for outputting a cleaning request signal for requesting cleaning of the inside of the pot (41) and the water level sensor (43) when the scale deposition determining section has determined that scale has deposited on the water level sensor (43).

9. The steam cooker according to claim 8, comprising:

a cleaning request notifying section for, after completion of heating of the object (90) to be cooked, notifying a user of a cleaning request based on the cleaning request signal outputted from the cleaning request outputting section.

10. The steam cooker according to claim 9, comprising:

a cancellation request rejecting section for, when there is a cancellation request from a user in response to the notification of the cleaning request by the cleaning request notifying section, determining whether or not a predetermined condition for rejecting the cancellation request is satisfied, and rejecting the cancellation request when the predetermined condition is satisfied.

11. The steam cooker according to claim 10, wherein the cancellation request rejecting section uses, as said predetermined condition, a condition that water supply to the pot (41) by the water supply control section is successively performed a third predetermined number of times or more, said third predetermined number of time being larger than the first predetermined number of times used for determining the deposition of scale.

12. The steam cooker according to claim 10, wherein the cancellation request rejecting section uses, as said predetermined condition, a condition that water supply to the pot (41) by the water supply control section is performed a fourth predetermined number of times, said fourth predetermined number of time being larger than the second predetermined number of times used for determining the deposition of scale.

13. The steam cooker according to claim 10, comprising:

a cancellation counting section for counting a number of times of cancellation of the cleaning request, wherein the cancellation request rejecting section uses, as said predetermined condition, a condition that a counted value of the number of times of cancellation represents a fifth predetermined number of times or more.

14. The steam cooker according to claim 13, wherein said cancellation counting section decrements or resets the counted value when no water supply to the pot (41) by the water supply control section has been performed in a cooking carried out after cancellation of the cleaning request.

15. The steam cooker according to claim 13, comprising a cleaning request cancellation count storing section for storing a counted value of the cancellation counting section in a non-volatile storing device.