JPS6321096B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a high-frequency heating device that automates cooking using a temperature sensor and a humidity sensor.

Conventional configuration and its problems In high-frequency heating devices that use conventional humidity sensors to automate cooking, the ambient temperature inside the heating chamber fluctuates as cooking progresses, resulting in irregular changes in relative humidity. It is easy to cook, so when cooking,
It was necessary to temporarily suppress the outflow of steam from the heated object by using auxiliary means such as covering the heated object with a wrap.

In addition, when the atmospheric humidity inside the heating chamber is high, the relative humidity becomes saturated due to water vapor generated from the heated object, and the function of the humidity sensor is lost. A heater is installed in the air guide to be introduced to control the temperature in the heating chamber or exhaust path to around 50℃, and a humidity sensor detects changes in relative humidity due to steam from the heated object to operate the high-frequency oscillator. Inventions and devises have been made to control methods. However, since the heating chamber wall adjacent to the air guide becomes hot, constructing the heating chamber with a painted iron plate poses a problem in terms of heat resistance. Therefore, the heating chamber must be made of stainless steel, which increases the cost, and there is a risk of burns if your hand accidentally touches the wall of the heating chamber during high-frequency cooking.

Furthermore, if a heat insulating material is used between the air guide and the heating chamber wall to prevent the heating chamber wall from becoming too hot, this will increase costs.On the other hand, if the output of the heater is reduced, the rate of temperature rise in the heating chamber and exhaust passage will increase. The drawback was that it was slow.

Purpose of the Invention The present invention solves the above-mentioned conventional drawbacks, and provides a high-frequency heating device that is highly safe and capable of more accurately detecting the cooking state of an object to be heated and controlling the operation of a high-frequency oscillator. The purpose is to

Structure of the Invention In order to achieve the above-mentioned purpose, the high-frequency heating device of the present invention converts a part of the air that has cooled the high-frequency oscillator into
The air is supplied into the heating chamber through an air guide with a heater installed therein, and an insulating space is provided between the heating chamber wall and the air guide, and the heating chamber wall is not heated by the heater, resulting in high safety. Moreover, by accurately detecting the cooking state of the object to be heated using a temperature sensor and a humidity sensor provided in the exhaust passage and controlling the operation of the high-frequency oscillator, it is possible to achieve good cooking.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

In FIG. 1, reference numeral 1 denotes a main body of the high-frequency heating device, and a heating chamber 2 in which the object to be heated is accommodated.
is provided. 3 is a high frequency oscillator, and the high frequency waves oscillated by this high frequency oscillator 3 are supplied into the heating chamber 2 through a waveguide 4. 5 is a high frequency oscillator 3
A part of the air that has cooled the high-frequency oscillator 3 is discharged to the outside of the main body 1 through an exhaust guide 6, and the other part is supplied into the heating chamber 2 through an air guide 7. Reference numeral 8 denotes an exhaust hole provided on the upper wall of the heating chamber, through which the air in the heating chamber 2 is exhausted from the exhaust hole 10 at the upper part of the main body 1 via an exhaust path 9.

11 is a temperature sensor provided in the exhaust path 9, and 12 is a humidity sensor. Reference numeral 13 denotes a wind direction changing plate that is provided so that the exhaust gas flowing in the exhaust path 9 comes into contact with the temperature sensor 11 and the humidity sensor 12 more often. Reference numeral 14 denotes an operation section provided on the front side of the main body 1. A cooking start button, a heating temperature setting device, etc. are attached to this operation section 14, and a high-frequency A control circuit (not shown) including a microcomputer for controlling the operation of the oscillator 3 is provided.

Reference numeral 15 denotes a door provided at the opening of the heating chamber 2 so as to be openable and closable.

In FIG. 2, 16 is a heater provided in the air guide 7, and this heater 16 controls the temperature of the air flowing in the heating chamber 2 and the exhaust path 9 during dielectric heating.
The temperature is maintained at around 50℃. 17 is heater 1
A heat insulating space is provided between the air guide 7 and the heating chamber wall, facing the mounting position of the air guide 6, and a vent hole 18 is provided so that air flows within this heat insulating space 17. 19 is an intake hole provided in the wall of the heating chamber.

The operation of the above configuration will be explained below.

First, after setting the keys according to the object to be heated on the operation unit 14, when the cooking start button is pressed, the heater 16 provided in the cooling fan 5 and the air guide 7 is operated, and the atmospheric temperature in the exhaust path 9 is is detected by the temperature sensor 11 and heated until it reaches a temperature of approximately 50°C, which is preset on the microcomputer. A part of the air flowing in the exhaust passage 9 is generated by the cooling fan 5, passes through the air guide 7 and the heat insulating space 17, mixes, and is supplied into the heating chamber 2, and is supplied to the exhaust hole 8.
from there to the exhaust passage 9.

The reason for maintaining the temperature in the exhaust passage 9 at about 50°C is to keep the relative humidity in the heating chamber 2 low even when the atmospheric humidity in the heating chamber 2 is high, and to keep the temperature in the exhaust passage 9 at about 50°C. This is to prevent the relative humidity in the heating chamber 2 from becoming saturated and to stably obtain the amount of change in relative humidity value necessary for humidity detection.

When the temperature inside the exhaust passage 9 reaches the set temperature, the high frequency oscillator 3 starts operating, and the relative humidity inside the exhaust passage 9 is preset from the lowest value stored in the microcomputer by water vapor from the heated object. Once the relative humidity change amount is obtained, heater 1
6 and the temperature control in the exhaust path 9 are stopped, and the high frequency oscillator 3 is operated for a time multiplied by the heating time coefficient of the object to be heated, thereby completing the cooking.

As described above, according to the present embodiment, a heat insulating space 17 is provided between the air guide 7 in which the heater 16 is installed and the wall surface of the heating chamber. After passing through
Since the air is mixed with the hot air that has passed through the air guide 7 and supplied to the heating chamber 2, the temperature inside the exhaust passage 9 can be quickly raised without heating the heating chamber wall. The cooking state of the object to be heated can be accurately detected and the operation of the high frequency oscillator 3 can be controlled.

In addition, by providing a heat insulating space 17 between the heating chamber wall and the air guide 7, the heating chamber wall is connected to the heater 1.
6, it is safe because there is no risk of burns because it is not heated.

Effects of the Invention As described above, according to the present invention, the following effects can be obtained.

1 By providing a heat insulating space between the heating chamber wall and the air guide, the heating chamber wall is not heated by the heater installed in the air guide, so the heating chamber is constructed of painted members. Furthermore, since no heat insulating material is required, the high frequency heating device can be provided at low cost.

2 Even if the output of the heater installed in the air guide is increased, the heating chamber wall will not be heated, so even if you accidentally touch the heating chamber wall during cooking, there is no risk of getting burned, and it is safe. This is convenient because the inside of the exhaust passage can be brought to the set temperature quickly.

[Brief explanation of the drawing]

FIG. 1 is a plan sectional view of a high-frequency heating device according to an embodiment of the present invention, and FIG. 2 is an enlarged sectional view showing the main parts of FIG. 1. 2... Heating chamber, 3... High frequency oscillator, 7... Air guide, 9... Exhaust path, 16... Heater, 1
7...Insulated space.

Claims (1)

[Claims] 1. A heating chamber that houses an object to be heated, a high-frequency oscillator that supplies high-frequency energy into the heating chamber,
A control circuit including a microcomputer that controls the operation of this high-frequency oscillator, and an air guide that guides a part of the air that has cooled the high-frequency oscillator with a cooling fan into the heating chamber, are installed to keep the inside of the heating chamber at a set temperature. A heater for heating and a sensor for detecting atmospheric temperature and atmospheric humidity in the heating chamber or an exhaust path communicating with the heating chamber are provided, and a heat insulating space is provided between the air guide and the wall surface of the heating chamber. High frequency heating device. 2. The high-frequency heating device according to claim 1, wherein a part of the wind generated by the cooling fan passes through the heat insulating space. 3. The high-frequency heating device according to claim 2, wherein the air passing through the air guide and the air passing through the heat insulating space are mixed and supplied into the heating chamber.