JPH0440088Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to an electric kotatsu for heating a general household in winter.

Conventional technology In conventional electric kotatsu, the temperature is generally controlled by a phase control method using the signal of the temperature sensor, and the correlation between the impedance change due to the temperature of the temperature sensor and the output of the heating element is The temperature-output characteristics to be controlled were prepared as shown in the figure.

For example, when the temperature is set to the maximum, the heating element will be heated at 100% of the rated output while the temperature is low at the beginning of energization.
As the temperature of the sensor rises, its impedance changes and the output of the heating element decreases, eventually stabilizing at a low output that is less than half the rating of the heating element, which balances the heat loss from the kotatsu futon etc. at that temperature. It is something to do. As shown in FIG. 5, this stable temperature was determined in advance and used as the initial temperature setting value.

Further, when the set temperature is low, the temperature rise is slow because the output of the heating element is also throttled from the beginning.

Problems that the invention aims to solve When looking at the actual use of the conventional electric kotatsu at home, it is found that if the desired temperature is set from the beginning of energization after stabilization, the temperature rises slowly and becomes lukewarm. In the beginning, set the temperature control to a high position and quickly warm it up, and after it warms up enough, gradually adjust it to your desired temperature setting.
Manual operations were required each time.

Also, the initial heating method on a higher scale varies depending on the temperature of the day and the temperature of the kotatsu at that time. Humans had to make various adjustments each time, such as making it slightly higher.

As described above, the manual temperature adjustment operation to obtain a desired temperature state as quickly as possible from the initial stage of energization has to be performed every time and is time-consuming.

Measures to solve the problems In order to solve the problems seen in conventional examples, we used sensors to detect information such as room temperature, kotatsu temperature, which humans normally feel, and the desired temperature after stabilization, and adopted a microcomputer. The aim is to automatically perform temperature control operations that previously had to be performed by humans by determining this detected data. Specifically, if you set the temperature control scale to your desired temperature from the beginning, when the electricity first starts up, the kotatsu will be heated at the highest scale output until the temperature inside the kotatsu reaches the temperature control set temperature + α℃, and the temperature will be adjusted. After reaching the set temperature +α°C, the temperature control device controls the output to be at a scale intermediate between the output at the set scale and the output at the highest scale, and then switches to the output at the set scale.

Effect With the above configuration, the heating at the initial stage of energization is not the output of the temperature control scale, but the output of the highest scale.
Heat to temperature control set temperature + α℃.

Also, after reaching the set temperature + α℃, the temperature is returned to the original desired temperature, but if the output is suddenly switched at this time, the output will remain at zero until the temperature drops to near the set temperature. As a result, the temperature will drop, so the temperature control set temperature + α
After reaching ℃, the output is temporarily heated at an intermediate level between the highest scale and the set scale, and then the output is switched to the set scale.

Embodiment An embodiment of the present invention will be described below with reference to FIGS. 1, 2, and 3.

1 is a lamp-shaped heating element made of a rod-shaped quartz tube. 2 is a temperature sensor consisting of a thermistor whose impedance changes with temperature changes. Reference numeral 3 denotes a heating element unit composed of a heating element 1, a temperature sensor 2, etc., and is mounted at the center of the back surface of the wooden tower 4. 5 is a controller that is connected to the heating element unit 3 by a cord and placed outside the tower 4, and has a power switch 6 for turning on and off the power, a temperature control setting device 7, a room temperature sensor 8, and a controller for controlling the temperature inside the kotatsu. It is equipped with a temperature control device 9 and the like.

The temperature-output characteristics of the temperature control device 9 for phase control are basically the same as the conventional one as shown in Fig. 4, but depending on the heating conditions, the output control can be switched to output control corresponding to each scale using an internal switching circuit. . Furthermore, the output control can be switched after reaching the temperature control set temperature + α℃.
By changing the scale of this figure internally,
This prevents the temperature from dropping immediately after switching.

The operation of this embodiment having the above configuration will be explained.

When the power is turned on, it detects the room temperature, kotatsu temperature, temperature control setting temperature, etc., and operates according to the heating conditions as follows.

When the temperature control setting temperature is set to a higher temperature than the current kotatsu temperature, for example, 5 degrees Celsius or more, the second
As shown in the figure, the heating at the initial stage of energization is not the output of the set temperature control scale, but the output of the highest scale, and the temperature control set temperature + α
It heats up to ℃, so it heats up quickly.

Also, after the temperature control set temperature + α℃ is reached, the temperature is returned to the originally set desired temperature, but if the output is suddenly switched at this time, the output will remain at zero until the temperature drops close to the set temperature. To avoid this, after the set temperature +α℃ is reached, the output is temporarily heated between the highest scale and the set scale, and then the output is switched to the set scale. .

Effects of the invention According to the invention, a function is provided that corresponds to the temperature control settings set by the person taking the temperature and controls heating with optimal rapid heating. By simply turning on the power switch, you can obtain the highest heating speed and get sufficiently warmed up right away, and there is no need to operate the temperature control, making it convenient and hassle-free.

In addition, with this rapid heating control, even at your favorite temperature setting, the output is equivalent to the highest scale, and the temperature control set temperature + α℃
Because it heats up all at once, it not only heats the air inside the kotatsu, but also the floor and futon, making it comfortable.

By installing heating control after the temperature control set temperature + α℃ is reached, there is no sudden temperature drop, and the feeling of being suddenly cold is eliminated, and a moderate level of comfort can be achieved even during this change. effective.

[Brief explanation of the drawing]

Fig. 1 is a partial sectional view of an electric kotatsu showing an embodiment of the present invention, Fig. 2 is a temperature characteristic diagram thereof, Fig. 3 is a block diagram thereof, and Fig. 4 is a temperature-output characteristic diagram of a conventional example. FIG. 5 is a diagram showing the temperature characteristics. 1... Heating element, 2... Temperature sensor, 9... Temperature control device.

Claims (1)

[Scope of utility model registration request] A heating element unit consisting of a heating element 1 and a temperature sensor 2 that detects the temperature inside the kotatsu, and a temperature control device that can control the temperature inside the kotatsu to a set temperature using the signal from the temperature sensor 2. In an electric kotatsu, when the electricity first starts up, the kotatsu warms up with the output at the highest scale setting until the temperature inside the kotatsu reaches the temperature control set temperature + α℃, and after reaching the temperature control set temperature + α℃, the output at the set scale and the highest scale are output. The electric kotatsu is characterized by having a temperature control device 9 which performs control to change the output to the set scale after setting the output to the intermediate scale.