JPH03269708A - Heating cooker - Google Patents

Abstract

PURPOSE:To attain the temperature control with high follow-up performance, to reduce falling degree of temperature due to a cooking subject applied, etc., and to improve the cooking ability with a heating cooker by providing a 1st temperature sensor of the contact type and a 2nd temperature sensor of the non-contact type. CONSTITUTION:A 1st temperature sensor 3 is welded by pressure on the bottom of a cooking pan 4, senses the temperature with the heat transmission, and a 2nd temperature sensor 6 is provided at a position under the pan 4 and senses the temperature on the bottom of the pan 4. The sense signals of both sensors 3 and 6 are sent to a controller 5. A comparison means 11 decides the difference of levels between a 1st temperature detector means 8 and a temperature setting means 10 and sends this decided result to a thermal power control means 12. The sensor 6 senses the changed variable of the bottom temperature of the pan 4 and outputs a prescribed time signal to the controller 12 when the changed variable of the temperature exceeds a fixed level. Meanwhile the controller 12 depends on the output signal of a 2nd temperature detector means 9 regardless of the output of the means 11. Thus it is possible to attain the temperature control with the reduced delay, to reduce the falling degree of temperature due to a cooking subject applied, and to improve the cooking ability with a heating cooker.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a heating cooker equipped with a temperature sensor and a temperature control function.

2. Description of the Related Art In recent years, heating cookers equipped with a heating heat source such as a heater and having a temperature control function according to the heating temperature of the food being cooked have become mainstream, and there is also a demand for good cooking performance. It is being

Conventionally, this type of heating cooker has generally had the configuration shown in FIGS. 5 and 6. The configuration will be explained below.

As shown in the figure, the main body (23) has a donut-shaped heater (24) arranged at the top, and a temperature sensor (25) at the center.
) are placed. Then, place the pot (2) on the heater (24).
6> is placed on top and used for cooking. Temperature sensor (25)
is pressed against the bottom of the pot (26) and detects the temperature of that part.The signal detected by the temperature sensor (25) is sent to the control device (26).
7) to control the amount of electricity applied to the heater (24). Further, the set temperature and the like are operated on the operation panel (28) and transferred to the control device (27).

Problems to be Solved by the Invention In such a conventional electric cooker, when the temperature of the pot (26) is detected by the temperature sensor (25) composed of a thermistor or the like, the heat capacity of the temperature sensor (25) is used to detect the temperature of the pot (26). (
There was a problem in that there was a delay in response to temperature changes of 26>.

The present invention is intended to solve the above-mentioned problems, and aims to enable temperature control that follows temperature changes in the pot, minimize temperature drops caused by adding food, etc., and improve cooking performance. It is said that

Means for Solving the Problems In order to achieve the above object, the present invention includes a second temperature sensor that detects the temperature of a heated object in a non-contact manner, and a temperature sensor that converts the temperature of the second temperature sensor into a signal. and a second temperature detecting means for converting the temperature, and when the second temperature sensor detects that the temperature of the object to be heated varies by more than a predetermined value, the thermal power adjusting means adjusts the temperature according to the output of the second temperature detecting means. The solution to the problem is to force the heating heat source to be energized for a predetermined period of time.

The present invention uses the above-mentioned problem-solving means to perform control using a signal from a contact type first temperature sensor when the pot temperature is stable, and to control using a signal from a non-contact type second temperature sensor when the pot temperature changes excessively. However, by forcibly energizing the heating heat source, a drop in pot temperature due to a delay in the response of the first temperature sensor can be prevented, and temperature control with high response accuracy can be achieved.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to FIGS. 1 and 2.

As shown in the figure, the main body 1 has a donut-shaped heater 2 on the top.
is provided, and the first temperature sensor 3 is arranged in the center thereof. A pot 4 is placed on the heater 2 and used for cooking. The first temperature sensor 3 is pressed against the bottom of the pot 4 and detects the temperature by heat conduction. A signal detected by the first temperature sensor 3 is sent to a control device 5 to control energization of the heater 2 .

Furthermore, a second temperature sensor 6 is disposed below the pot 4 to detect the temperature of the bottom of the pot without contact, and also sends a detection signal to the control device 5.

The heater 2 has linear heating elements 7 arranged in a spiral shape and filled with insulating powder.

Within the control device 5, the signal from the first temperature sensor 3 is converted into an electrical signal by the first temperature detection means 8, and the signal from the first temperature sensor 3 is converted into an electrical signal by the second temperature sensor 6.
The signal is converted into an electrical signal by the second temperature detection means 9. Further, the temperature of the pot 4 is set on the operation panel 13 and converted into a signal by the temperature setting means 10. The comparing means 11 determines the magnitude relationship between the first temperature detecting means 8 and the temperature setting means 10, and outputs the result to the heating power adjusting means 12, and when the temperature detected by the heating power adjusting means 12 is lower than the set temperature, Heater 2
The temperature of the pot 4 is controlled by increasing the amount of electricity supplied, and conversely reducing it when it is high.

The second temperature sensor 6 is for detecting the amount of change in the bottom surface temperature of the pot 4, and the signal is processed by the second temperature detection means 9, and when the ratio exceeds a certain level, a signal is generated for a predetermined period of time. is output to the firepower adjustment means 12, and during that time the firepower adjustment means 1
2, the heater 2 depends on the output signal of the second temperature detection means 9 regardless of the output of the comparison means 11.

Next, the configuration and operation of the second temperature sensor 6 and second temperature detection means 9 are shown in FIGS. 3 and 4 (a) to (e).
Explain using.

The second temperature sensor 6 consists of a pyroelectric infrared sensor 14, a chopper 15, and a chopper drive motor 16. The chopper 15 rotates in response to the chopper drive motor 16, and the small hole 17 provided in the chopper 15 is heated. When passing above the electric infrared sensor 14, an output signal (FIG. 4(b)) corresponding to the bottom temperature of the pot 4 (FIG. 4(a)) is output.

The signal input from the second temperature sensor 6 to the second temperature detection means 9 is amplified by the amplification means 18 (FIG. 4(C)).
, the peak hold is detected by the waveform shaping means 19 (see FIG. 4).
d)), input the result into the storage means 20 and store the contents (FIG. 4(e)). The determining means 21 compares each output of the waveform shaping means 19 and the storage means 20 at a constant temperature detection timing (A-D), and determines that the output value of the waveform shaping means 19 is smaller than that of the storage means 20 by a predetermined value or more. At this time, a signal is output to the time setting means 22 to set the time,
A signal is output to the thermal power adjustment means 12, and the heater 2 is forcibly energized regardless of the output of the comparison means 11 as described above.

The basic characteristic of the pyroelectric infrared sensor 14 is that it outputs the magnitude of an electrical signal depending on the temperature difference between the sensor's own temperature and the temperature of the object to be measured. Differences in temperature fluctuations in the pan 4 can be determined without being greatly influenced by the temperature of the atmosphere where the type infrared sensor 14 is installed.

It goes without saying that the same effect can be obtained even if the heater 2 is an induction heating coil.

Effects of the Invention As is clear from the above embodiments, according to the present invention, the contact-type first temperature sensor detects gradual temperature fluctuations of the heated object, and detects sudden temperature drops. Detection with a non-contact second temperature sensor enables temperature control without delay, minimizes temperature drops due to things such as adding food, and provides a cooker with excellent cooking performance. can do.

[Brief explanation of drawings]

Fig. 1 is a block circuit diagram of a heating cooker according to an embodiment of the present invention, Fig. 2 is a longitudinal sectional view of the same heating cooker, and Fig. 3 is a second temperature sensor and a second temperature sensor of the same heating cooker. FIG. 4 is a block diagram of the temperature detection means; FIG. 4 is an operation timing chart of the second temperature detection means; FIG. 5 is a vertical cross-sectional view of a conventional heating cooker; FIG. It is a perspective view of a heating cooker. 1... Main body, 2... Heater (heat source for heating), 3... First temperature sensor, 4...
・Pot (object to be heated), 6...second temperature sensor,
8...First temperature detection means, 9...Second temperature detection means, lO...Temperature setting means, 1
1...Comparison means, 12...Firepower adjustment means. t-m-bee 9 (additional l!l note: employment) g-11 2-31 cliff t-1 dimension 1112 Figure E--4 books Figure 3 Figure 4 Figure Ha υ--→- Piece Interval Diagram Diagram

Claims (1)

[Claims] a first temperature sensor that is provided inside the main body and detects the temperature of a heated object placed on the top surface of the main body by thermal conduction; and a first temperature sensor that converts the temperature detected by the first temperature sensor into a signal.
temperature detection means, temperature setting means for setting the temperature of the object to be heated, comparison means for determining the magnitude of each output of the first temperature detection means and the temperature setting means, and an output signal of the comparison means. a heating power adjustment means that determines the amount of electricity applied to the heating heat source, a second temperature sensor that non-contact detects the temperature of the object to be heated, and converts the temperature detected by the second temperature sensor into a signal. and a second temperature detection means, and when the thermal power adjustment means detects that the decrease in the temperature of the heated object has fluctuated by a predetermined value or more by the second temperature sensor,
The cooking device is configured such that the heating heat source is forcibly energized for a predetermined period of time by the output of the second temperature detection means, regardless of the output signal of the comparison means.