JP2856530B2 - Cooker - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial application field) The present invention relates to a heating cooker provided with an oxidation catalyst that activates when heated and exhibits a deodorizing function.

(Prior Art) In a heating cooker, for example, an oven grill range, a deodorizing device is provided in an exhaust passage of a cooking chamber in order to remove an odor generated at the time of heater heating cooking, specifically, at the time of oven cooking or grill cooking. It is thought that. This deodorizing device includes an oxidation catalyst and a heater for heating and activating the oxidation catalyst.

(Problem to be Solved by the Invention) In the deodorizing apparatus having the above-described configuration, when the cooking operation is started, the heater for the oven cooking or the grill cooking is energized and the heater for the oxidation catalyst heating is energized. It is configured to

However, in this case, even if the food is heated by the cooking heater and the odor is generated, the oxidation catalyst does not reach the activation temperature yet, and as a result, the odor is discharged to the outside. .

Accordingly, an object of the present invention is to provide a heating cooker in which an oxidizing catalyst is activated at the time when odors start to be generated from food, and the odors can be prevented from being discharged to the outside from the beginning.

[Configuration of the Invention] (Means for Solving the Problems) In order to achieve the above object, the heating cooker of the present invention is configured such that after the control device supplies power to the catalyst heater at the beginning of the cooking operation, The method is characterized in that substantial energization to the cooking heater is started.

In this case, it is preferable that the heater for cooking and the heater for catalyst are alternately energized after the heating of the food is started.

(Operation) Since cooking and heating of the food is started in a state where the oxidation catalyst is activated by heating, the air in the cooking chamber is not discharged to the outside without being deodorized.

Also, during cooking heating, the catalyst heater is intermittently heated, so there is no possibility that the oxidation catalyst drops below the activation temperature.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

First, in FIGS. 2 and 3 showing the overall schematic configuration, an inner box 3 having a cooking chamber 2 inside is provided inside an outer box 1. A magnetron 5 is provided in a machine room 4 formed on the right side of the inner box 3 and a motor 6 is provided.
A fan device 8 having a fan 7 attached thereto is disposed. The fan device 8 sucks outside air and sends it to the magnetron 5. A part of the wind that has passed through the magnetron 5 is supplied into the cooking chamber 2 through the duct 9. The air supplied into the cooking chamber 2 is discharged outside through an exhaust duct 10 serving as an exhaust passage provided on the left side of the inner box 3. This exhaust duct 10
As shown in FIG. 4, a deodorizing device 13 including an oxidation catalyst 11 and a catalyst heater 12 for heating and activating the oxidation catalyst 11 and a gas sensor 14 for detecting steam and the like are provided therein. In addition, the gas sensor 14, the catalyst heater 12, and the oxidation catalyst 11 move in the direction of air flow from the cooking chamber 2.
Are arranged in this order.

As shown in FIG. 4, the catalyst heater 12 is configured by disposing a nichrome wire 17 as a heating wire in a pipe 16 such as a quartz pipe or a ceramic pipe whose both ends are sealed by insulators 15. The insulator 15 is supported on both upper and lower surfaces of the exhaust duct 10.

On the other hand, on the rear side of the inner box 3, as shown in FIGS. 2 and 3, an oven cooking heater 18 is provided.
When the circulation fan 19 is rotated by the motor 20 during oven cooking, the air heated by the heater 18 is supplied into the cooking chamber 2. Further, a heater 21 for grill cooking is provided on the upper surface of the inner box 3, and heat of the heater 21 is radiated into the cooking chamber 2.

Further, a door 22 for opening and closing the cooking chamber 2 is pivotally provided on a front portion of the outer box 1 and an operation panel 23 is provided. Although not shown, the operation panel 23 is provided with various switches and indicators. Operation panel
On the back side of 23, a control device 24 mainly composed of a microcomputer is provided, and the control device 24 controls cooking based on input signals from the various switches, the gas sensor 14, and the like, and a program stored in advance. . The gas sensor 14 is for automatically controlling cooking when the food is microwave-heated by the magnetron 5, and is not directly related to the present invention.

In the above configuration, the operation when performing oven cooking or grill cooking will be described with reference to the time chart of FIG. Note that, in FIG. 1 (a), the hatched portions indicate the energization periods of the respective heaters.

When a start operation is performed to start the oven cooking operation or the grill cooking operation, as shown in FIG.
First, only the catalyst heater 12 is energized while the power is cut off. Thereby, as shown in FIG. 1 (b), the temperature of the oxidation catalyst 11 rapidly rises and reaches the activation temperature of 200 ° C. to 250 ° C. in a few minutes. Then, when the oxidation catalyst 11 reaches the activation temperature, the oven cooking heater 18 or the grill cooking heater 21 is energized as shown in FIG. As shown, cooking room 2
The inside temperature rises, and the cooking and heating of the food is started. The energization of the catalyst heater 12 at the beginning of the cooking operation may be performed for a preset time, or may be performed until the temperature of the oxidation catalyst 11 is detected and becomes equal to or higher than the activation temperature. You may do it.

Thus, when the cooking and heating are started, an odor is generated from the food, and the air containing the odor is discharged from the exhaust duct 10 to the outside. However, at this time, the oxidation catalyst 11
Since the temperature has already reached the activation temperature, the odor contained in the air passing through the exhaust duct 10 is oxidized and decomposed by the deodorizing action of the oxidation catalyst 11, so that the air containing the odor is not discharged to the outside as it is. .

During such cooking heating, the catalyst heater 12 and the oven cooking heater 18 or the grill cooking heater 21 are energized alternately as shown in FIG. 1 (a). The intermittent short-time energization of the catalyst heater 12 prevents the oxidation catalyst 11 from lowering below the activation temperature, so that the oxidation catalyst 11 exhibits a normal deodorizing function during cooking and heating.
The reason for turning off the oven cooking heater 18 or the grill cooking heater 21 when the catalyst heater 12 is energized in this way is as follows.
This is to prevent the current value of the entire oven grill range from exceeding the rated value. In FIG. 1 (a),
The period of power cut-off of the oven cooking heater 18 indicated by A is due to the temperature in the cooking chamber 2 having become equal to or higher than the set temperature.

In the above embodiment, only the catalyst heater 12 is energized at the beginning of the cooking operation, but the oven cooking heater 18 or the grill cooking heater 21 is set to a low output in accordance with the energization of the catalyst heater 12. (Low calorific value)
When the temperature of the oxidation catalyst 11 becomes higher than the activation temperature, the oven cooking heater 18 or the grill cooking heater 21 may be switched to a high output. In this way, the oxidation catalyst
Cooking room 2 using the time to heat 11 to the activation temperature
Since the inside can be preliminarily heated and the cooking heating can be started thereafter, the cooking operation time can be shortened.

Further, in the above embodiment, during cooking heating, the heater 18 for the oven cooking or the heater 21 for the grill cooking is cut off intermittently for a short period of time, and the catalyst heater 12 is energized at the time of this cutoff. The heater 12 may be always energized with a low output. Even in this case, since the temperature of the air exhausted from the exhaust duct 10 is high, there is no possibility that the oxidation catalyst 11 will be insufficiently heated and fall below the activation temperature.

Furthermore, the invention is not limited to microwave ovens,
It can be widely applied to cooking devices in general.

According to the present invention described above, the following effects can be obtained.

In the heating cooker according to the first aspect, the oxidation catalyst is heated and activated by the catalyst heater at the beginning of the start of the cooking operation, and the cooking heater starts heating the food by the cooking heater in the activated state of the oxidation catalyst. By doing so, cooking and heating of the food is started in a state where the oxidation catalyst is heated and activated,
The heating cooker according to claim 2, wherein the odor can be deodorized from the beginning and the odor is not discharged to the outside. During the cooking heating of the food in the activated state of the oxidation catalyst, the cooking heater and the catalyst heater are alternated. With this configuration, the oxidation catalyst is intermittently heated during cooking heating, so that there is no danger that the temperature will fall below the activation temperature, and a normal deodorizing function is exhibited.

[Brief description of the drawings]

The drawings show one embodiment of the present invention, and FIG. 1 is a time chart showing the oxidation catalyst and temperature changes in the cooking chamber.
2 and 3 are a cross-sectional plan view and a vertical cross-sectional side view of the entire microwave oven, and FIG. 4 is an enlarged vertical cross-sectional view of a deodorizing device. In the drawing, 2 is a cooking room, 10 is an exhaust duct, 11 is an oxidation catalyst,
Reference numeral 12 is a catalyst heater, 18 is an oven cooking heater, and 21 is a grill cooking heater.

Claims (2)

(57) [Claims] An oxidation catalyst, a catalyst heater for heating and activating the oxidation catalyst to exhibit a deodorizing function, a cooking heater, and a control device for controlling energization of the catalyst heater and the cooking heater. The heating device, wherein the control device starts energizing the heater for cooking after energizing the heater for catalyst at an early stage of the start of the cooking operation. 2. During cooking and heating of food by the cooking heater,
The heating cooker according to claim 1, wherein the cooking heater and the catalyst heater are energized alternately.