JPH03221730A - Oven range - Google Patents

Abstract

PURPOSE:To prolong the life of expensive parts such as a magnetron by a method wherein a cooling fan for cooling the magnetron, a high voltage transformer or the like is continuously operated during at least the cooking operation irrespective of which one of the heating devices of a micro-wave type or an external heating type is operated. CONSTITUTION:A control device for use in controlling a magnetron 4, a hot air heating device 7 and a radiation heating device 8 can perform a cooking operation of a specified mode set by a cooking mode inputting means 13. In the event that two or three keys of the cooking mode inputting means 13 are concurrently operated, the control device performs concurrently the operation of the heating devices corresponding to each of the keys and then performs a concurrent heating and cooking operation. The control device operates the cooling fan 6 in response to the operation of the cooking start key 10 even in the case that any of the cooking modes are performed and at the same time it operates the predetermined heating device and then the operation of the cooling fan 6 is stopped in response to the fact that all the operations are completed. With such an arrangement, irrespective of whether the magnetron 4 of the micro-wave heating device is operated or not, the cooling fan 6 is always operated during a cooking operation under all cooking modes.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a cooling fan operating device for cooling a magnetron for generating microwaves, a high voltage transformer, etc. in a microwave oven.

[Prior Art] Conventionally, in this type of microwave oven, the cooling fan motor starts to drive at the same time as cooking starts using microwave heating.
The cooling fan motor is stopped at the same time as cooking ends or after a certain period of time has passed after cooking ends.

Further, in the case of cooking without microwave heating, the cooling fan motor is not driven.

[Problems to be Solved by the Invention] However, when heating other than microwave heating, such as oven cooking or grill cooking, is performed many times in succession, the temperature inside the oven cavity rises considerably, and as a result, the magnetron and high-voltage transformer The temperature of microwave generators, etc., including the

Also, if you start cooking in the oven or on the grill right after cooking with microwave heating many times in a row, the cooling fan will stop working and the temperature of the magnetron and high-voltage transformer will not drop sufficiently, which will shorten the service life. There was a risk that it would be shortened.

The present invention has been made to solve the above-mentioned problems, and provides a microwave oven that can extend the life of expensive parts such as the magnetron.

[Means for solving the problem] In order to achieve this object, the microwave oven of the present invention has the following features:
Regardless of whether an external heating device such as a heater or a microwave heating device is used, the cooling fan is always operated at least during cooking. For example, a cooling fan may be activated at the same time as power is turned on to the microwave oven, or cooking cannot be started unless the cooling fan is activated. Regardless of which of the two heating devices is used, the cooling fan can be operated at least during cooking;
The magnetron and high voltage transformer can be sufficiently cooled to extend their life.

[Example] Hereinafter, an example embodying the present invention will be described with reference to the drawings.

1 to 3, an oven cavity 2 whose at least one side is covered with a door 1 that can be opened and closed, and a food 3 that is supplied with microwaves and that is housed in the oven cavity 2, The microwave oven is equipped with a magnetron 4, a high voltage transformer 5, etc. as a microwave heating device for internally heating the oven. It is equipped with an external heating device such as electric resistance or gas combustion means that heats the food externally by using hot air, radiation, convection, etc. In this embodiment, hot air is supplied into the oven cavity 2 to perform oven cooking. A hot air heating device 7 and a radiant heating device 8 for grill cooking to brown food.
Both are equipped with electrical resistance type sheathed heaters. The food 3 can be cooked by operating either of these two heating devices and the microwave heating device individually or simultaneously.

In addition, a control panel 9 arranged on one side of the door 1 has a microwave key for operating the magnetron 4 to perform microwave heating, and an oven key for operating the hot air heating device 7 for oven cooking. A cooking mode input means (input device) 13 consisting of a grill key for operating the heating device 8 to perform grill cooking is provided, and a time manual input means (input device) 14 for inputting cooking time, which cooking mode A single cooking start key 10, etc., which is commonly used in both systems, is provided.

In the above configuration, the control device for controlling the magnetron 4, the hot air heating device 7, and the radiant heating device 8 can perform cooking in a mode specified by the cooking mode input means 13, for example, by operating a range key. When the microwave cooking mode is specified, time input means 1
During the cooking time input in step 4, the magnetron 4 is operated to perform cooking by microwave heating, and when the oven cooking mode is designated by operating the oven key, the hot air heating device 7 is also operated. When oven cooking is performed and grill cooking mode is designated by operating the grill key, the radiant heating device 8 is similarly activated to perform grill cooking. Further, when two or three keys of the cooking mode input means 13 are operated at the same time, the control device simultaneously operates the heating devices corresponding to the respective keys to perform simultaneous heating cooking.

Then, when any cooking mode is executed, the control device operates the cooling fan 6 based on the operation of the cooking start key 10, and operates each predetermined heating device, and all of the heating devices are activated. Based on the completion of the operation, the operation of the cooling fan 6 is stopped (see FIG. 3). As a result, the cooling fan 6 always operates during cooking in all cooking modes, regardless of whether or not the magnetron 4 of the microwave heating device is operated.

[Modification] Regardless of which heating device is used, the following method may be adopted as a method of always operating the cooling fan 6 at least during cooking.

a) A power switch 11 is provided that can turn on and off the power to the microwave oven, and the cooling fan 6 is activated at the same time as the power is turned on to the microwave oven, and stopped at the same time when the power is turned off.

b) A cooling fan dedicated switch 12 is provided for supplying and cutting off power to the cooling fan 6, and unless the cooling fan 6 is started to operate by operating the cooling fan dedicated switch 12, all of the heating devices are not activated. do not.

C) Unless control data such as cooking mode designation and cooking time are input to the control device, none of the heating devices will operate, and the cooling fan dedicated switch 12 will not operate.
Unless the operation of the cooling fan 6 is started by the operation of
Input devices 13 and 14i: Input of control data is not possible.

[Effects of the Invention] As is clear from the detailed description above, according to the present invention, the cooling fan is always operated at least during cooking, regardless of whether a microwave heating device or an external heating device is used. Therefore, the magnetron, high-voltage transformer, etc. for generating microwaves can be sufficiently cooled, and the temperature will not rise abnormally, making it possible to extend the lifespan.

[Brief explanation of drawings]

1 to 3 show an embodiment embodying the present invention, in which FIG. 1 is a front view of a microwave oven, FIG. 2 is a side sectional view of the oven 1, and FIG. FIG. 2 is an explanatory diagram showing the operation of a heating device and a cooling fan. In the diagram, 1 is the door, 2 is the oven cavity, 3 is the food, and 4
is a magnetron, 5 is a high voltage transformer, 6 is a cooling fan,
7 is a hot air heating device, 8 is a radiant heating device, 10 is a cooking start key, 11 is a power switch, 12 is a dedicated cooling fan switch, and 13 and 14 are input devices.

Claims (1)

[Claims] 1. An oven cavity whose at least one side is covered with a door that can be opened and closed; a microwave heating device comprising a magnetron and a high-voltage transformer that supply microwaves into the oven cavity; and the oven cavity. It is equipped with an external heating device such as electric resistance or gas combustion means that heats the food stored in the container from the outside by using hot air, radiation, convection, etc., and either one of these heating devices can be operated alone or both can be operated simultaneously. In the microwave oven, the cooling fan for cooling the magnetron, the high-pressure transformer, etc. is operated at least for cooking the food, regardless of which of the heating devices is operated. A microwave oven characterized by the fact that the inside is always in operation. 2. The microwave oven according to claim 1, wherein the cooling fan is activated at the same time as the power to the microwave oven is turned on, and is stopped at the same time as the power is turned off. 3. Both of the heating devices start operating based on the operation of one cooking start key, and the cooling fan starts operating based on the operation of the cooking start key, and all operations of the heating devices start. Claim 1 characterized in that the operation is stopped based on the completion of the operation.
Microwave oven as described in. 4. A cooling fan dedicated switch is provided for supplying and cutting off current to the cooling fan, and unless the cooling fan is started to operate by operating the cooling fan dedicated switch, neither of the heating devices is activated. The microwave oven according to claim 1, wherein the microwave oven is configured as follows. 5. Unless control data for the heating device is input through an input device, neither of the heating devices is activated, and the cooling fan is not activated by operating the cooling fan dedicated switch. 5. The microwave oven according to claim 4, wherein input of control data using an input device is disabled.