JPS6332222A - High frequency heating equipment - Google Patents

Abstract

PURPOSE:To be able to cool a humidity sensor at the refresh time without changing the specifications of a cooling fan even if operating surroundings and a source voltage are changed by installing a humidity sensor for detecting the humidity in exhaust gas and a refresh heater for burning off the stains on the humidity sensor without changing the refreshing time. CONSTITUTION:At the start of cooking a control circuit 1 starts to energize a refresh heater 3 attached at the surrounding of a humidity sensor to remove the stains on the sensor 2. The circuit 1 instructs a cooling fan 4 to be energized rotate the fan and forces cold to flow from an oven suction hole 5 to the inside 6 of an oven and then to cool the equipped sensor 2 in order to supplement the condition that humidity measurement can be carried out quickly. In case when the circuit 1 judges on the basis of the output from a switchover part 10 for destinations that the rotating speed of the fan is in a higher area, refresh time T1 is made shorter and in case when the revolving speed is in a lower area, refresh time T2 is made longer.

Description

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

BACKGROUND OF THE INVENTION Current humidity sensors require a refresh control to remove dirt. One way to do this is to wrap a heater around the sensor and energize it to raise the temperature of a portion of the sensor, thereby burning off the dirt. However, this method causes some parts of the sensor to become hot,
Even after the heater is turned off, the original purpose of measuring humidity cannot be measured for a while.

Therefore, in order to quickly move on to humidity measurement, there is a method of cooling the sensor by applying air from a cooling fan.

Problems to be Solved by the Invention Assuming that the time until the humidity can be measured is the refresh time T, this time T is related to the amount of wind described above or the room temperature and humidity of the place where it is used. In other words, these conditions vary depending on the power supply voltage, environment, and destination, so it is necessary to change the specifications of the cooling fan to obtain the same performance, but it is not possible to standardize the specifications of the cooling fan depending on the destination.
There was a problem that the cost would increase.

The present invention solves these conventional problems3...-
7, which allows the humidity sensor to be cooled during refreshing without changing the specifications of the cooling fan even if the usage environment or power supply voltage changes.

Means for Solving the Problems The high frequency heating device of the present invention includes a humidity sensor for detecting humidity in exhaust gas, and a refresh heater provided near the humidity sensor to burn off dirt on the humidity sensor. However, it has a variable refresh time.

Operation With the above configuration, the refresh time is recognized by inputting destination switching to the control circuit section, and the most suitable control for the destination can be performed.

Example An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a control block diagram of the present invention. 1 is the control circuit that is the main control, and when cooking starts, the humidity sensor 2
The refresh heater 3 attached around the humidity sensor 2 is started to be energized to remove dirt from the humidity sensor 2. In addition, the control circuit 1 instructs the cooling fan 4 to be energized, rotates the fan, introduces cold air into the oven interior 6 from the oven intake port 5, passes through the oven exhaust lower, and cools the air to the humidity sensor 2 installed there.
The system cools the air and helps to quickly measure humidity. In addition, the control circuit 1 determines the time until humidity measurement becomes possible (
After the elapse of the refresh time (hereinafter referred to as refresh time), the humidity sensor 2 starts measuring the steam generated from the food 7, and at the same time instructs the high frequency oscillator 9 to be energized to start heating the food.

Furthermore, the control circuit 1 can receive the current state of the power supply voltage through input from the destination switching unit 10 .

The input allows the refresh time to be recognized and control most appropriate for the destination.

FIG. 2 shows changes in humidity detected by the humidity sensor 2. First, after starting cooking, refresh heater 3
As a result, the humidity level rises rapidly without indicating the humidity inside the oven chamber 6. However, as soon as the refresh heater 3 is turned off, the humidity sensor 2 cools down, and after a certain period of time has passed, it starts to detect the humidity in the oven interior 6. In other words, the above-mentioned refresh time T must be longer than this recovery time.

Further, this return time varies depending on the air volume of the cooling fan 4, that is, the number of rotations, and naturally, when the number of rotations is low, the return time becomes longer.

FIG. 3 is a diagram of the relationship between time and humidity level according to one embodiment of the present invention. In other words, when the control circuit 1 determines based on the input from the destination switching unit 10 that the region has a high rotation speed of the cooling fan 4 (FIG. 3a), the refresh time T1 is short;
If it is determined that the rotational speed is low (FIG. 3b), the refresh time T2 is increased.

FIG. 4 is a control flowchart of this control circuit 1. First, by inputting information to the destination switching unit 10, it is determined whether the region has a high rotation speed or a low rotation speed of the cooling fan 4.

When cooking starts, based on this determination, for example, if the rotation speed is high, the refresh time T is set to 1 minute, and if the rotation speed is low, the refresh time T is set to 2 minutes, and the cooling fan 4 is turned on. Next, T is subtracted every second, and when the refresh time ends, the high frequency oscillator 9 is turned ON and humidity detection is started.

Effects of the Invention (1) As described above, the high-frequency heating device of the present invention can control the cooking time to the shortest cooking time suitable for the destination in order to set the refresh time appropriate for the destination.

(2) Since control is performed by a control circuit program, it can be implemented at low cost.

(3) Since the specifications of the cooling fans can be unified, costs can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the relationship between time and humidity of a high-frequency heating device which is an embodiment of the present invention, and FIG. 4 is a control flowchart of the same control circuit. 1...Control circuit, 2...Humidity sensor, 3...71--Refresh heater, 4...Cooling fan, 5
...Oven intake hole, 6...Oven interior, 7...Oven exhaust port, 8...
Food, 9... High frequency oscillator, 10...
Destination switching department, 11...Sensor human power. Name of agent: Patent attorney Toshi Nakao, male, idiot 1/-
eJ wholesale RG Kei? ---Bugumu Pincer J-Refresh Heater 4--Azuf Fan 5-Oashi Air Intake 6--Oven Inside 7--Oano Bowl Air Port & -4-Products// --e;Sir λ Ka Figure 3 Mountain humidity

Claims (1)

[Claims] A heating cabinet for storing food; a high-frequency oscillator for supplying high-frequency power to the heating cabinet; a control circuit for controlling the high-frequency oscillator; an intake port, an exhaust port, and a cooling fan for intake and exhaust from the heating cabinet; A humidity sensor located near the mouth to detect humidity in the exhaust gas, and a refresh heater located near the humidity sensor to burn off dirt on the humidity sensor, and means for varying the refresh time of the refresh heater. High frequency heating device.