JPH076696B2 - Electric kotatsu - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to an electric kotatsu for warming a general household in winter.

2. Description of the Related Art Conventional electric kotatsu The temperature control in the kotatsu is as follows. First, a heating element unit consisting of a heater and a blower is generally attached to the center of the back surface of the yagura, but a temperature sensor is installed in this heating element unit to adjust the temperature inside the kotatsu to this temperature. The sensor was used to keep watch and the heater output was controlled to maintain the desired temperature setting.

As a heater output control device that correlates with this temperature sensor, a device that directly controls the energization of the heater using a thermostat or a semiconductor type sensor that spreads the temperature and outputs to the heater by an electronic circuit such as a phase control method Was to control There are other methods by controlling the air volume, etc., but with the phase control method, when setting a certain temperature scale and looking at the temperature change in the kotatsu and the heater output change after turning on the switch, all methods show the first The temperature or output characteristics were as shown by the dotted line represented in FIG.

That is, when the switch is turned on, the heater and blower work to raise the temperature in the kotatsu, and when the temperature reaches the desired set temperature, the temperature sensor controls the output to the heater to keep the temperature in the kotatsu constant thereafter. It worked to keep.

Problems to be Solved by the Invention In the conventional techniques as described above, the temperature of the electric kotatsu has a function of keeping the set temperature after the switch is turned on until it reaches the set temperature. there were.
Therefore, the temperature inside the kotatsu is set to the set temperature irrespective of the presence or absence of a person who is collecting heat from the kotatsu.

Therefore, it would be good if there was always a person who collects heat, but in daily life, there are few chances of keeping the temperature on the set scale even without a heat collector. Especially when the temperature is set higher, it is warm and comfortable when there is a warmer, but maintaining a high temperature when there is no warmer requires electricity and energy loss. ，
Also, the high temperature has adverse effects such as safety and shortening the life of each component.

Means for Solving Problems To solve the problems seen in the conventional example, when there is no warmer in the kotatsu, which has a heating element unit by the air blower at the bottom, it lays down in the kotatsu and does not move at all. In the case of time etc., the temperature of the air flowing through this air passage is constant at the set temperature, and the output of the heater that correlates to the temperature sensor is also constant, and the warmer enters or leaves the kotatsu. In the case of movement, etc., pay attention to the fact that the temperature of the air flowing in this air passage and the output of the heater that correlates with it become a characteristic that the output is constant or unstable. This is solved by providing a control device for maintaining or changing the temperature in the kotatsu set depending on the situation, and for controlling the temperature, for example, to lower the temperature if there is no warmer.

Action With the above configuration, the presence or absence of a warmer is caught and the kotatsu temperature is further controlled. The action is as follows.

When the power is turned on, the heater is energized, the inside of the kotatsu warms up, and the temperature sensor monitors the temperature, and when the temperature reaches the set temperature, the output of the heater is controlled to keep the temperature constant.

Here, the air in the kotatsu is sucked into the heating element unit by the air blower and is blown out as an air passage inside, so that the air in the kotatsu is agitated to eliminate the temperature unevenness in the kotatsu.

At this time, by installing the temperature sensor in the air passage, and particularly in the air passage for suction, the temperature inside the kotatsu can be detected properly and more sensitively.

That is, the temperature of the temperature sensor provided in the air passage correlates with the temperature depending on whether it is in a constant temperature state, is rising, is falling, or is in an unstable temperature state that is changing up and down. Another control device judges the output change state of the heater to control whether the temperature inside the kotatsu is maintained at a set temperature, lowered below the set temperature, or raised to the set temperature.

As a result, when there is no warmer, the kotatsu temperature becomes the set temperature and eventually becomes constant at the set temperature.
Since the output of the heater that correlates to this is also constant, control such as lowering the temperature below the set temperature is performed to make it warmer than the set temperature, and the warmer moves in and out of the kotatsu or moves in the kotatsu after warming. When the temperature sensor is installed in the air passage, the temperature of the air flowing in the air passage decreases or becomes unstable, and the output of the heater that correlates with this temperature sensor becomes unstable. It senses the changing state and controls to maintain the set temperature.

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

Reference numeral 1 denotes a lamp-shaped heater made of a rod-shaped quartz tube, which is formed on both sides of a blower device 2 made up of a fan 3 and a motor 4. Reference numeral 5 denotes a temperature sensor, which is a signal source for catching the temperature in the kotatsu and controlling the output of the heater 1, and is provided in the air passage 6 in the suction port 61 of the heating unit 7. Reference numeral 7 denotes a heating element unit including the heater 1, the blower 2, the temperature sensor 5 and the like, and the guard 63
A suction port 61 is provided at the center of the, and a blowout port 62 is provided at the outer periphery of the guard 63. Reference numeral 8 is a yagura provided with legs at four corners, and a heating element unit 7 is attached to the back surface of the center thereof.
(A) shows the flow of air in the heating element unit 7 portion by the blower 2. 81 is a futon, and (b) shows the air flow in the kotatsu which is operating as a kotatsu. 9 is a controller, which is a signal from the temperature sensor 5,
It is provided with a control device 11 for controlling the output of the heater 1 so as to set the temperature in the kotatsu.

The operation of the above configuration will be described below.

The temperature control in the kotatsu using the temperature sensor 5 is as follows. As shown in Fig. 2, kotatsu heater 1
When energized, the kotatsu temperature rises and eventually reaches the set temperature. At the same time, the output of the heater 1 is gradually reduced to a low output. Furthermore, whether the output state of the heater 1 maintains a constant output or is in a changing and unstable state, a control device 11 for checking the secondary side voltage of the current transformer in the external control controller 9
If the output state of the heater 1 is constant, temperature control is performed so that the temperature is lowered to a temperature lower than the initially set temperature.

Next, in the lowered state, when the stable state continues for a certain period of time again, control is performed to lower the temperature to a temperature slightly lower than the current temperature, and this is repeated to gradually lower the kotatsu temperature.

EFFECTS OF THE INVENTION According to the present invention, the conventional kotatsu temperature control determines whether or not the output of the heater energizing the kotatsu is in a constant output state, as opposed to the method of controlling to maintain a constant temperature at all times. Further controls the kotatsu temperature.

The temperature inside the kotatsu is kept at the set temperature, and the warmth during heating is the same as before, but when there is no person in the kotatsu and the set temperature is already held for a certain period of time, the kotatsu temperature is kept. Since it lowers the temperature, it is not necessary to use the unnecessary power to maintain the high temperature when there are no people in the room, thus saving energy.

Further, when there is no person, the kotatsu temperature is automatically lowered, so it is safe, and it is a useful function such as an advantageous function when forgetting to turn it off.

Also, by gradually and gradually decreasing the kotatsu temperature from the stable temperature, the temperature at the time of re-entering after the person leaves the kotatsu is warm and long when the time is short. The farther away you are, the more energy saving is required, and even if someone goes in or out again, you will be comfortable because the temperature will not drop sharply. In addition, it is intended to provide a control device that is safe even in terms of usability, even if the temperature is lowered by one step due to a malfunction.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part of an electric kotatsu showing one embodiment of the present invention, FIG. 2 is a characteristic diagram of temperature and output of an electric kotatsu showing a conventional example and one embodiment of the present invention, and FIG. It is a principal part sectional view of the electric kotatsu which shows the whole one Example of invention. 1 ... Heater, 2 ... Blower, 5 ... Temperature sensor, 7 ... Heating unit, 11 ... Control device.

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Claims (1)

[Claims] 1. A heating element unit (7) comprising an air blower (2), a heater (1) and a temperature sensor (5) for catching the temperature inside the kotatsu, and a signal from the temperature sensor (5) being inputted to the temperature. In the electric kotatsu composed of the control device (11) for controlling, the output of the heater (1) is electrically monitored, and whether the heater output is an output narrowed down than the rated output and holds a constant output. , It is determined whether the output is changing and unstable, and when the constant output is held for a certain period of time, the kotatsu temperature is controlled to be slightly lowered, and the temperature drop in the kotatsu is gradually reduced. An electric kotatsu, which is equipped with a control device (11) for controlling the above.