JPH0499519A - Rice cooker potless detection device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a rice cooker potless detection device that detects the presence or absence of a pot at the start of rice cooking.

2. Description of the Related Art In recent years, in order to ensure safety, rice cookers that stop cooking if there is no pot have become common.

Conventionally, this type of rice cooker has generally had a configuration as shown in Japanese Patent Publication No. 62-298315. The configuration will be explained below with reference to FIGS. 4 and 5.

As shown in the figure, a protective frame 2 is disposed inside the main body (not shown), and this protective frame 2 has a through hole 2a in the center of the bottom. The heater 3, which is a heating element, has a through hole 3a in the center.
and is fixed to the inner bottom of the protective frame 2. The pot 4 is removably placed on the heater 3.

The temperature sensing element 5 has a connecting plate 5a at the bottom, is housed in a heat sensitive case 6 fixed to the through hole 3a in the center of the heater 3, and is attached so as to be in close contact with the bottom surface of the pot 4. It senses the temperature inside the pot 4.

The coil spring 7 is interposed between the temperature detection element 5 and the heat-sensitive case 6, and moves downward when the pot 4 is placed on the heater 3 as shown in FIG. 5, and rises when the pot 4 is removed as shown in FIG. The temperature sensing element 5 is energized so as to perform the following.

A control board 8 for controlling rice cooking is fixed to a lower frame 9 fixed to the lower part of the protective frame 2 with screws 8a. Further, a safety switch 10 is provided on the control board 8, and a pin 10a of the safety switch 10 is biased by a coil spring 11, and the electric contact portion is moved by movement of the pin 11a.

The lever 12 is rotatably attached to the lower frame 9 by a rotating part 13, and the tip 12a of this lever 12 has a temperature sensing element 5.
It is attached to the connecting plate 5a of the safety switch 10, and as the connecting plate 5a moves, it rotates about the rotating shaft part 13 as a fulcrum, and the actuating part 12b of the lever 12 moves the bottle 11 of the safety switch 10. It is something.

To explain the operation of the above configuration, as shown in FIG. 4, when the pot 4 is not placed, the temperature sensing element 5 is urged by the coil spring 7 and moves upward. Along with this, the tip 12 of the lever 12 comes into contact with the interlocking plate 5a.
a rotates counterclockwise about the rotating part 13, and the actuating part 12b presses the bottle 10a of the safety switch 10 to turn the safety switch 10 into an OFF state.

Further, as shown in FIG. 5, when the pot 4 is placed on the heater 3, the temperature sensing element 5 moves downward. As a result, the distal end 12a of the coil spring 11 comes into contact with the interlocking plate 5a and rotates clockwise around the rotating part 13 as a fulcrum.
A is released from the pressure by the actuating portion 12a of the lever <-12 and protrudes outward by the spring force of the coil spring. As a result, the security switch 10 is turned on. Security switch
When Sochi 10 is ON, you can cook rice, and O
Rice cannot be cooked in the FF state.

Problems to be Solved by the Invention Such a conventional rice cooker potless detection device requires a safety switch 10 and a lever 12, and requires strict dimensional control to ensure accurate operation. However, there were problems such as high cost and poor assembly.

The present invention solves the above problems, and aims to provide a rice cooker potless detection device that is low in cost and easy to assemble.

Means for Solving the Problems In order to achieve the above object, the present invention stops heating the heater when the temperature detected by the temperature detection means reaches the first control temperature, and then stops heating the heater within a predetermined time. The rice cooker is configured to include a control means that determines that the pot is not present when the second control temperature is reached and stops cooking rice.

Effect: With the above-described configuration, the temperature detection means detects the first control temperature and the second control temperature, so that the control means detects the absence of a pot.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to FIGS. 1, 2, and 3.

As shown in the figure, a pot 3 for storing rice and water is removably placed on a heater 14. Temperature sensing element 15 is w41
It is pressed against the center of the bottom of the pot 13 and detects the temperature inside the pot 13.

The control board 17 connects the temperature sensing element 15 through the lead wire 16.
The receiver is configured to receive the signal and control the rice cooking.

FIG. 2 is a flowchart showing the processing flow of the no-pot detection means, in which heating is started in step 18 and then step 19 is performed.
At step 20, it is checked whether the first control temperature tl is reached, and at step 20, heating is stopped. Next, in step 21, it is checked whether the second control temperature t2 has been reached, and if the temperature is higher than t2, it is determined that there is no pot and the rice cooking is stopped.

Also, in step 22, it is checked whether a predetermined time T has elapsed since the start, and if t2 does not reach t2 in step 21, it is determined that there is a pot, and normal rice cooking is performed.

In the above configuration, the operation will be explained with reference to Figure 3.
4 is the temperature vs. time curve of the temperature sensing element 15 when the pot 13 is not present, and 25 is the temperature sensing element 15 when the pan 13 is present.
is the temperature vs. time curve. If there is no pan 24, even if heating is started in step 18 and the first control temperature tl is reached in step 19, heating is stopped in step 20, the residual heat of the heater 14 will cause the temperature of the temperature sensing element 15 to change. reaches the second limit mfA degrees t2, so step 21
to stop cooking. If there are 25 pots 13, heating is started in step 18, and heating is stopped when tl is reached in step 19, but unlike in the case of 24 pots 13, the heat from the heater 14 is absorbed and the temperature detection element 15 will never become t2 in step 21. After this step 2
In Step 2, it is checked whether one hour has passed since the start, and after one hour has passed, normal rice cooking is performed in Step 23.

In this way, according to the rice cooker of this embodiment, the temperature sensing element 1
Based on the difference in the temperature and time curve of the temperature detection element 15 detected by the temperature sensing element 5 with and without the pot 13, the absence of the pot can be detected, and the rice cooking can be controlled by the control means 17 based on the signal.

Effects of the Invention As is clear from the description of the embodiments above, according to the present invention, the control means controls heating of the heater when the temperature detected by the temperature detection means for detecting the temperature of the pot reaches the first control temperature. Since the rice cooking is stopped when the second control temperature is reached within a predetermined time, the control means and the temperature detection means can detect the absence of a pot and control the rice cooking, and the structure is simple. It is inexpensive and can improve assembly workability.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway front view of a rice cooker showing an embodiment of the present invention, Fig. 2 is a flowchart showing the flow of rice cooking control of the rice cooker, and Fig. 3 is temperature detection when there is a pot and when there is a pot. A graph showing the relationship between element temperature and time; FIG. 4 is a cross-sectional view of main parts showing the state of a conventional rice cooker when the pot is removed;
FIG. 5 is a sectional view of a main part of the rice cooker showing the state when the pot is placed on the heater. 13... Pot, 14... Heater, 15.
...Temperature detection element (temperature detection means), 17...
...Control board (control means). Agent's name Patent attorney Shigetaka Awano Idiot 1 Nofu Knee Jin - Evening 1N Chochi Yuko ni: Dan qnte~) Material Fight S Shudai Figure Figure 24 - Pot! ! (l bottle 5 25--one pot t) rice cake i*t Katakaku

Claims (1)

[Claims] The method includes a pot for storing food to be cooked, a starting means for starting cooking rice, a temperature detecting means for detecting the temperature of the pot, a heater for heating the pot, and a control means for controlling the rice cooking, and the control means , the heating of the heater is stopped when the temperature detected by the temperature detection means reaches a first control temperature, and the rice cooking is stopped when the temperature reaches a second control temperature within a predetermined time thereafter. A rice cooker no-pot detection device.