JPH03140711A - Gas heater with temperature sensor - Google Patents

Abstract

PURPOSE:To simplify operation of a gas heater and to make its use convenient by controlling heating power of a burner so that boiling point is maintained when boiling point is detected by means of a temperature sensor and upper limit temperature is maintained when boiling point is not detected. CONSTITUTION:When water is present in a vessel 3, the water boils at a temperature of T1, while the temperature of the bottom of the vessel is established corresponding to the boiling point. A control unit 6 detects boiling point and when boiling point is detected, heating power is decreased to maintain the boiling point by controlling a proportional valve 2. As evaporation of the water in the vessel 3 progresses and amount of the water decreases, the temperature T of the bottom of the vessel becomes higher than the boiling point. When the temperature T becomes higher than the boiling point by predetermined temperature of T, solenoid valve 9 is closed to extinguish fire.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a stove with a temperature sensor.

Specifically, the present invention relates to a gas stove that determines the characteristics of the contents inside the container based on the temperature rise characteristics of the bottom temperature of the container and controls the firepower of the burner accordingly.

[Background technology] In conventional stoves with temperature sensors, the bottom temperature of the container is detected by the temperature sensor, and the control unit controls the proportional valve, thereby adjusting the burner firepower so that the heating temperature remains constant. The operation panel 51 is as shown in FIG. The operation panel 51 is provided with a pair of input switches 52, 53 and a fire extinguishing switch 54, and next to them are a number of mode display lamps 55 for displaying the set temperature or cooking mode.
a, 55b, -., 55h are provided.

Thus, when any input switch 52 or 53 is pressed, the burner is ignited, and after ignition, when any input switch 52 or 53 is further pressed, the input switch 52, 53
The lighting position of the mode display lamp moves one step at a time in the direction indicated by , and the control section controls the firepower of the burner so as to maintain the displayed bottom temperature of the container.

[Problems to be Solved by the Invention] With conventional stoves equipped with temperature sensors, the user selects an appropriate mode from among the various temperatures or cooking modes as described above, and adjusts the cooking temperature according to the input temperature. If you are not used to using the mode, you will not know which mode to select.
The user had to select between two modes, the operation was complicated, and the usability was not sufficiently considered. In addition, the operation panel became large and the configuration of the operation panel was complicated.

The present invention has been made in view of the drawbacks of the conventional examples described above, and its purpose is to simplify the operation of a stove with a temperature sensor and improve its usability.

[Means for Solving the Problems 1] Therefore, the stove with a temperature sensor of the present invention includes a combustion burner, a valve means for controlling the firepower of the burner, and a bottom surface of a container placed above the burner. A temperature sensor that detects the temperature at the bottom of the container, an ignition switch, and when the boiling point is detected based on the temperature rise characteristic of the bottom temperature of the container detected by the temperature sensor, the burner firepower is adjusted to maintain the boiling point temperature. and a control unit that controls the firepower of the burner to maintain the upper limit temperature when the boiling point is not detected.

[Function] In the present invention, when there is water (or water and cooking ingredients, etc.) in the container, the boiling point is detected by the temperature sensor, so in that case, the boiling point temperature is reached. The firepower of the burner is controlled to maintain the Also, if there is oil in the container (when frying tempura) and the boiling point is not detected within the upper limit temperature, the upper temperature limit set at a temperature suitable for cooking tempura etc. will be maintained. This is to adjust the firepower of the burner. Therefore, the user only needs to press the ignition switch, after which the control will automatically adjust the temperature to the appropriate temperature as described above, simplifying the operation of the stove.

[Example] Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 shows a schematic diagram of an embodiment of a stove with a temperature sensor. The burner 1 has a gas pipe 15 connected to its base end 18 and is supplied with gas and secondary air from the base end 18, and a large number of flame ports 8 are provided on the outer peripheral surface of an annular portion 7 at the tip. It is being Further, the gas pipe 15 is provided with an electromagnetic on-off valve 9 and a proportional valve 2, so that ignition, extinguishing, or heating power of the burner 1 can be adjusted. On the other hand, a temperature detector 10 is disposed at the center of the annular portion 7 of the burner 1 . The temperature detector 10 has a structure, for example, as shown in FIG. Forced,
A temperature sensor 4 is attached to the lower surface of the thermal head 12, and a sensor lead wire 14 of the temperature sensor 4 passes through the guide shaft 11 and is connected to the control section 6. Therefore, the thermal head 12 of this temperature detector 10
is designed to descend against the spring 13 when pressed, so that the cooking container 3 such as a kettle or pot can be placed on the trivet 1.
When the thermosensitive head 12 is placed on the container 6, the thermal head 12 is slightly lowered and brought into secure contact with the bottom of the container 3, so that the temperature sensor 4 can detect the temperature at the bottom of the container.

The structure is such that the flame emitted from the flame port 8 of the burner 1 does not hit the thermal head 12 and heat the thermal head 12.

Further, as shown in FIG. 3, the operation panel 17 provided on the front surface of the stove is provided with only an ignition switch 5, an extinguishing switch 19, and an ignition lamp 20 for checking ignition.

The control unit 6 is equipped with a microcomputer, and in addition to the temperature sensor 4, the switches 5, 19, etc. of the operation panel 17, the proportional valve 2, the electromagnetic on-off valve 9, etc. are connected, and the temperature sensor 4 and the operation panel The proportional valve 2 and the like are controlled based on the input information from the burner 17, and the thermal power of the burner 1 is controlled as described below. 3 containers such as pots and 1 trivet
6, the thermal head 12 of the temperature detector 10 is pressed and brought into firm contact with the bottom surface of the container 3. When the ignition switch 5 on the operation panel 17 is pressed, the electromagnetic on-off valve 9 is opened and the igniter (not shown) is continuously discharged to ignite the burner 1. When the burner 1 is ignited, as shown in FIG. 4, the bottom temperature T of the container initially increases gradually over time. For example, when there is water in the container 3, the temperature T+(100
The temperature at the bottom of the container becomes constant at that boiling point. As a result, the control unit 6 detects the boiling point, and when the boiling point is detected, controls the proportional valve 2 to maintain the boiling point by switching the heating power to a weak level. After this, as the moisture in the container 3 progresses to evaporate and the moisture in the container 3 disappears, the bottom temperature T of the container begins to rise above the boiling point, so the temperature of the bottom of the container T begins to rise above the boiling point. When the bottom temperature T rises, the electromagnetic on-off valve 9 is closed to extinguish the fire. In addition, when there is oil in the container 3 for cooking tempura, etc., the bottom temperature T of the container rises to the upper limit temperature T2 without detecting the boiling point. As shown by the solid line, the thermal power of the burner 1 is reduced at the upper limit temperature T2, and the proportional valve 2 is controlled to maintain a temperature suitable for cooking tempura (=lower upper limit temperature 2; for example, 180° C.). In addition, if the inside of the container 3 is empty, the temperature rises without detecting the boiling point, and the bottom temperature of the container rises even if the heating power of the burner 1 is reduced, it is determined that the inside of the container 3 is empty. It is preferable to extinguish the burner 1 by

In the above embodiment, the case where water is contained in the container 3 (in the case of boiling water, cooking rice, boiled food, etc.) and the case where the container 3 is filled with oil (in the case of tempura, etc.) are described, but other modes are possible. For example, when cooking rice using a pressure vessel 3, the boiling point will rise above the boiling point T of water, as shown by the broken line C in Figure 4. In that case, after the boiling point T is reached, the heat power of the burner 1 can be controlled to be suitable for cooking rice.

Furthermore, by examining the temperature rise characteristics of the food to be cooked, it is also possible to control the firepower of the burner in a variety of modes.

[Effects of the Invention] According to the present invention, when a boiling point is detected, the boiling point is maintained, and when the boiling point is not detected, the temperature is maintained at a constant temperature (upper limit temperature).
Since the bottom temperature of the container is maintained at the same time, the user does not need to set the switches on the operation panel in detail according to the type of cooking, making the gas stove easier to operate and more convenient to use. Additionally, the operation panel is simplified and downsized.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram showing an embodiment of the present invention, Fig. 2 is a cross-sectional view showing the temperature sensor as above, Fig. 3 is a front view showing the operation panel as above, and Fig. 4 is a control section as above. FIG. 5 is a front view showing a conventional operation panel. 1...-Burner 2...Proportional valve 3...Container 4...Temperature sensor 5...Ignition switch 6...Control section

Claims (1)

[Claims] (1) A burner for combustion, a valve means for controlling the firepower of the burner, a temperature sensor that comes into contact with the bottom surface of the container placed above the burner to detect the bottom temperature of the container, an ignition switch, and the above-mentioned temperature sensor. If a boiling point is detected based on the temperature rise characteristic of the bottom temperature of the container detected by A stove with a temperature sensor, characterized by comprising a control section that controls the firepower of the burner.