JPS62134458A - Electric 'kotatsu' - Google Patents

Abstract

PURPOSE:To save energy consumption in an electric 'Kotatsu' (foot warmer), by installing a temperature sensor, which controls the temperature in the 'Kotatsu' further by detecting the temperature of the air flowing through an air passage whether it is constant or unstable, in the air passage in a heater unit. CONSTITUTION:A fan unit 2 and heater 1 are provided to a heater unit 7. The heater unit 7 is fitted to the back side of the top plate of a 'Kotatsu' framework. A temperature sensor 5 is installed in an air passage 6 in the heater unit 7. In controls the temperature inside the 'Kotatsu', and controls the temperature in it further by detecting the air flowing through the air passage 6 whether it is kept constant or not. It lowers the temperature is order to save useless energy when nobody is sitting at the 'Kotatsu' to take warmth out of it and a predetermined temperature has been kept constant in the 'Kotatsu' for a predetermined time. Safety of the 'Kotatsu' appliance is kept because control by the sensor 5 can automatically low temperature when no one is sitting at the 'Kotatsu'.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an electric kotatsu for heating a general household in winter.

Prior Art The temperature inside the kotatsu of a conventional electric kotatsu was controlled by the following energization process. First, a heating element unit consisting of a heater, air blower, etc. is generally installed in the center of the back of the tower, but a temperature sensor is installed inside this heating element unit, and the temperature inside the kotatsu is measured based on this temperature. Monitored by sensors,
The amount of electricity supplied to the heater was controlled to maintain the desired temperature. There are two types of temperature sensor and current control devices: one that uses a thermostat to directly control the energization of the heater, and the other that measures the temperature with a semiconductor sensor and controls the amount of current to the heater using an electronic circuit. there were. There are other methods such as controlling the air volume, but it is set to a certain temperature scale.

Looking at the temperature change inside the kotatsu after turning it on,
All the methods had temperature characteristics as shown by the dotted line in Figure 2.

In other words, when you turn on the switch, the heater and air blower operate to raise the temperature inside the kotatsu, and when it eventually reaches the desired set temperature, the temperature sensor controls the amount of electricity supplied to the heater, keeping the temperature inside the kotatsu constant from then on. It works to keep it safe.

Problems to be Solved by the Invention In the conventional technology as described above, the temperature of the electric kotatsu does not have a function to maintain the temperature set at the desired temperature after the switch is turned on. there were.

As a result, the temperature inside the kotatsu remains at the set temperature regardless of whether or not someone is warming the kotatsu.

Therefore, it would be fine if there was always someone there to take the temperature, but in daily life there are many chances of the temperature being maintained at the set scale even without someone taking the temperature. Especially when the temperature is set at a high temperature, it will be warm and comfortable when someone is there to take the heat, but maintaining a high temperature when there is no one to take the heat means high electricity bills and energy loss. In addition, high temperatures had adverse effects such as shortening safety and the lifespan of each component.

Means to Solve the Problems In order to solve all the problems seen in the conventional example, we installed a heating element unit using an air blower. In some cases, the temperature of the air flowing throughout this air passage is constant,
In case the person taking the heat comes in and out of the kotatsu or moves inside the kotatsu.

Paying attention to the fact that the temperature of the air flowing through this air path changes, you can maintain or change the temperature inside the kotatsu depending on whether it is a constant temperature or an unstable temperature that is changing. 1. For example, if there is no one taking the heat, the temperature can be lowered by using another control circuit. This is solved by installing a temperature sensor in the air passage inside the heat generating unit.

For production With the above configuration, it is possible to detect whether there is a person taking heat.

The kotatsu temperature is further controlled, and its function is as follows.

When you turn on the power, the heater is energized, warming the inside of the kotatsu, and the temperature sensor monitors the temperature.

When the set temperature is reached, the power to the heater is controlled to maintain the set temperature constant.

Here, the air inside the kotatsu is sucked into the heat generating unit by the blower and then blown out using the inside as an air path, so the air inside is stirred and the temperature inside the kotatsu is evened out.

At this time, by installing a temperature sensor in the air path, especially in the suction air path, the temperature inside the kotatsu can be accurately and more sensitively detected.

In other words, depending on whether the temperature of the temperature sensor installed in the air path is constant, or unstable, such as rising, falling, or changing up and down, The control circuit section makes decisions to control whether the temperature inside the kotatsu is kept at the set temperature, lowered below the set temperature, or raised to the set temperature.

As a result, when there is no one taking the heat, the temperature of the kotatsu is constant, so it is controlled to lower it below the set temperature, and since it is lukewarm than the set temperature and is changing during heating, it is controlled to raise it to the set temperature. Furthermore, when the person taking the heat goes in and out of the kotatsu, or is moving around inside the kotatsu to take warmth, the temperature sensor installed in the air passage detects that the temperature of the air flowing through the air passage is unstable. , to maintain the set temperature.

Example 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 consisting of a fan filter and a motor 4. 5 is a temperature sensor that detects the temperature inside the kotatsu and outputs power to heater 1. It is a signal source for control and is provided in the air passage B of the suction port 61 in the first heating element unit Z. 7 is a heating element unit consisting of the heater 1, the blower 2, the temperature sensor 5, etc., and the guard 6
A suction port 61 is provided in the center of the guard 63, and a blowout port 62 is provided throughout the outer periphery of the guard 63. 8 is a tower with legs at the four corners, and a heating element unit 7 is attached to the back of the tower in the center. (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 inside the kotatsu while it is operating as a kotatsu. 9 is a control controller;
The signal from the temperature sensor 5 controls the amount of electricity supplied to the heater 1 in order to set the temperature inside the kotatsu.

The operation of the above configuration will be explained next.

The temperature inside the kotatsu using the temperature sensor 5 is controlled as follows. As shown in FIG. 2, when electricity is applied to the kotatsu, the temperature of the kotatsu rises and eventually reaches the set temperature. Furthermore, whether the temperature state of the temperature sensor 5 is maintaining a constant temperature or is changing and becoming unstable,
For example, if the temperature inside the kotatsu is constant, the temperature is controlled to be lower than the initially set temperature.

Here, the temperature sensor 5 is installed in the air passage 6 where it can most sensitively detect the temperature inside the kotatsu, and also on the side of the suction port 61, so it can monitor the kotatsu temperature most accurately.

Effects of the Invention According to the present invention, the temperature of the kotatsu is controlled to maintain a constant temperature as in the conventional method, but the temperature of the kotatsu can be further controlled by determining whether or not the temperature of the kotatsu is at a constant temperature. Control.

The same temperature of the kotatsu is maintained at the set temperature, and the warmth during heating is the same as before, but when there are no two people inside, the kotatsu maintains the same temperature at the set temperature for a certain period of time. This saves energy because there is no need to use wasted electricity to keep the kotatsu at a high temperature when no one is in the room, which would cause the metalwork to burn.

Furthermore, when no one is present, the temperature of the kotatsu is automatically lowered, making it safe and useful in case you forget to turn it off. Fig. 1 is a sectional view of the main parts of an electric kotatsu showing an embodiment of the present invention, and Fig. 2 is FIG. 3 is a temperature characteristic diagram of an electric kotatsu showing a conventional example and an embodiment of the present invention. FIG.

1...Heater, 2...Blower device.

5... Temperature sensor, 6... Air path.

7... Heat generating unit.

Claims (1)

[Claims] A heating element unit (7) having an air blower (2) and a heater (1), and the heating element unit (7) is attached to the lower part to control the temperature inside the kotatsu, and to control the temperature inside the heating element unit (7). A temperature sensor (5) is installed to further control the temperature inside the kotatsu depending on whether the temperature of the air flowing through the air passage (6) is maintained at a constant temperature or is unstable.
) is provided in the air passage (6) of the heating element unit (7).