Heating cooker

A technology for cookers and heating chambers, which is applied to electric heating fuel, lighting and heating equipment, household heating, etc. It can solve the problems of low detection accuracy of humidity sensors and unsatisfactory cooking results, and achieve good results and improve detection accuracy. Effect

Inactive Publication Date: 2012-09-19
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in the conventional structure described above, the amount of steam generated from the food depends on the load, so when the load is small, there is a problem that the detection accuracy of the humidity sensor decreases.
[0005] In addition, it is known that if a large amount of dry air is sent in before steam is generated from the food, the food becomes dry and the cooking result is not satisfactory (for example, Japanese Patent Application Laid-Open No. 2006-46714)

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0028] figure 1 It is a cross-sectional view showing the heating cooker according to Embodiment 1 of the present invention.

[0029] exist figure 1 Among them, the heating cooker of this embodiment has: a microwave generating unit 1; a heating chamber 2, which accommodates a load heated by microwaves; a fan 3, which sends air into the heating chamber 2; a humidity sensor 4, which measures the load in the heating chamber. The amount of steam in 2; the infrared sensor 5, which detects the temperature of the load in a non-contact manner; the load determination unit 6, which determines the load in the heating chamber 2 according to the temperature of the infrared sensor 5; and the control unit 7, which The speed of the fan 3 is controlled.

[0030] Usually, a magnetron is often used for the microwave generating unit 1 , but a semiconductor type or the like may be used.

[0031] In the microwave generating unit 1 , microwaves are generated by feeding power from an inverter circu...

Embodiment approach 2

[0081] Next, Embodiment 2 of the present invention will be described. The description of the same parts as those in Embodiment 1 will be omitted, and only the different points will be described.

[0082] As described in Embodiment 1, the load amount determining means 6 detects the temperature of the load amount by the infrared sensor 5 to determine the load amount. Since the temperature rises quickly when the load is small, even if the control unit 7 stops the microwave generating unit 1 based on the detection result of the infrared sensor 5 or the humidity sensor 4, it is easy to heat to a temperature above the target temperature.

[0083] In order to prevent such a situation, in the present embodiment, when the load determined by the load determination unit 6 is determined to be “small”, the control unit 7 reduces the output of the microwave generation unit 1 . Thereby, it is possible to moderate the temperature rise rate of the load and improve the accuracy of bringing the...

Embodiment approach 3

[0086] Next, Embodiment 3 of the present invention will be described. The description of the same parts as those in Embodiment 1 will be omitted, and only the different points will be described.

[0087] As described in Embodiment 1, when the load is small, the amount of steam generated is also small, and the humidity sensor 4 needs to capture the slight change, which is easily affected by noise and the like, resulting in a large error.

[0088] As one of the countermeasures, as described in Embodiment 1, there is proposed a method of increasing the detection accuracy by increasing the rotation speed of the fan 3 to send sufficient air to the humidity sensor 4 .

[0089] As another countermeasure, in the present embodiment, when the load determined by the load determination unit 6 is “small”, the control unit 7 intermittently repeats the rotation and stop of the fan 3 .

[0090] When the rotation of the fan 3 is stopped, there is no pressure from the outside, so the air in th...

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Abstract

The invention provides a heating cooker which can not reduce detection accuracy of a humidity sensor even load is small. The heating cooker is provided with a microwave production unit; a heating chamber (2) for accepting load to be heated by microwave; a fan (3) for feeding air into the heating chamber (2); a humidity sensor (4) for detecting quantity of steam in the heating chamber (2); an infrared sensor (5) for detecting load temperatures in a non-contact way; a load quantity determination unit (6) for determining load in the heating chamber (2) according to the infrared sensor (5); and a control unit (7) for controlling a rotation speed of the fan (3). The control unit (7) controls a rotation speed of the fan (3) according to the load quantity determined by the load determination unit (6) to change air quantity fed in the heating chamber (2). According to the structure, the detection accuracy of the humidity sensor (4) can be raised even the load is small and heating can stop in a case that heating is not performed no matter what the load is.

Description

technical field [0001] The present invention relates to a heating cooker used in general households, restaurants and offices. Background technique [0002] Conventionally, as an example of such a heating cooker, Patent Document 1 discloses a method in which the temperature of the fan is changed between the case of using an infrared sensor and the case of using a humidity sensor to discharge the heat in the heating chamber. Vapor for easy detection in individual sensors. [0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 61-149732 [0004] However, in the conventional configuration described above, the amount of steam generated from the food depends on the loading amount, so when the loading amount is small, there is a problem that the detection accuracy of the humidity sensor is lowered. [0005] In addition, it is known that if a large amount of dry air is supplied before steam is generated from food, the food becomes dry and the cooking result is unsa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F24C7/08
Inventor 藤涛知也河合祐
Owner PANASONIC CORP
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