JPS62248931A - Electric foot warmer - Google Patents

Abstract

PURPOSE:To make it possible to positively detect any disturbance in the temperature within the foot warmer due to the warmth taking by providing a blower within a heating unit so that the blower sucks up air from the center on the lower surface of a heating unit and blower off toward the outer periphery of the foot warmer. CONSTITUTION:Lamp-like heaters 1 are formed on both sides of a slower 2 consisting of a fam 3 and a motor 4. Suction port 61 are provided at the center of a guard 63 disposed on the lower surface of a heat unit 7, and blow-off ports 62 are provided around the outer periphery of the guard 63. An air flow (a) at the part of the heating unit 7 caused by the blower 2 is blown off toward the outer periphery of the foot warmer through the blow-off port 62, and is circulated around the entire part of the foot warmer in a short period of time and then is sucked in the heating unit 7. In this case, the position where a temperature sensor 5 is provided is located in an air flowpath 6 where the temperature within the foot warmer can be detected most sensitively, and further on the side of the suction port 61. Therefore, the temperature of the foot warmer can be monitored most correctly.

Description

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

Prior Art The temperature inside the electric kotatsu was controlled in the following manner. 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. It was monitored by sensors and controlled the heater to maintain the desired temperature.

Heater control devices that are related to this temperature sensor include those that use a thermostat to directly control the power supply to the heater, and those that use a semiconductor sensor to measure the temperature and input the input to the heater using an electronic circuit such as a one-phase control method. It was something to control. There are other methods such as controlling the air volume.

If you set the phase control method to a certain temperature scale and look at the temperature change inside the kotatsu and the change in the output of the heater after turning on the switch, all methods will produce a temperature as shown by the dotted line in Figure 2. Alternatively, the output characteristics were as shown in 6P.

In other words, when you turn on the switch, the heater and air blower operate, the temperature inside the kotatsu rises, and when the desired temperature is reached, the controller controls the input to the heater.
It worked to keep the temperature inside the kotatsu constant from then on.

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. A high temperature of just one inch would have negative effects, such as reducing safety and shortening the lifespan of each component.

Means to Solve the Problems In order to solve the problems seen in the conventional example, we developed a kotatsu with a heating element unit at the bottom using an air blower.The kotatsu does not move at all when there is no one to warm the inside of the kotatsu or when the person lies down inside the kotatsu. At certain times of the day, the temperature of the air flowing through this air path is constant at the set temperature, and the output of the heater, which is correlated with this temperature, is also constant, so that warmers can come in and out of the kotatsu. Pay attention to the fact that when the kotatsu moves, the temperature of the air flowing through this air path and the output of the heater change. Depending on whether the output or temperature is constant or unstable, the temperature inside the kotatsu can be maintained or changed. If the temperature inside the kotatsu is constant, a control circuit is installed to lower the temperature inside the kotatsu.9 A blower device is installed inside the heating unit so that air is sucked in from the center of the bottom of the heating unit and blown out toward the outer circumference of the kotatsu. The problem can be solved by

action 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 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 is eventually blown out using the inside as an air path, so the air inside the kotatsu is agitated 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, whether the temperature inside the kotatsu detected by the temperature sensor installed in the air passage is in a constant state, or is in an unstable state such as rising, falling, or changing up and down. Alternatively, it is possible to judge the state of the heater's output and 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, the temperature inside the kotatsu will reach the set temperature when no one is there to take the heat, and it will eventually become constant at the set temperature.
The output of the heater, which is related to this, is also constant, so the temperature is controlled to be lower than the set temperature, and the temperature is controlled to be lukewarm than the set temperature. When the temperature inside the kotatsu drops or becomes unstable, the heater output associated with this also becomes unstable, and these changes are detected and controlled 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 7 P made of a rod-shaped quartz tube, and is formed on both sides of the blower device 2 consisting of a fan 3 and a motor 4. A temperature sensor 5 is a signal source for detecting the temperature inside the kotatsu and controlling the heater 1, and is a signal source for controlling the heater 1. It is located on the road. A suction port 61 is provided at the center of the guard 6 provided on the lower surface of the heating element unit 7, and an air outlet 62 is provided at the outer periphery of the guard 66. 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. (r) is the flow of air in the heating element unit 7 portion by the air blower 2, which blows out from the suction port 62 toward the outer circumference of the kotatsu, eventually goes around the inner metal body of the kotatsu, and then flows from the central suction port 61 into the heating element unit. This shows the flow of air sucked into Z. 81 is a futon.

0) indicates the air flow inside the kotatsu while it is operating as a kotatsu. This is a nine-piece controller, and is equipped with a control device 11 having a control circuit 10 that controls the heater 1 to set the temperature inside the kotatsu based on a signal from a temperature sensor 5.

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 Figure 2, the kotatsu heater 1
When electricity is applied to the kotatsu, the temperature of the kotatsu rises and eventually reaches the set temperature. Along with this.

The output of the heater 1 is also gradually reduced to a low output. Furthermore, whether the internal temperature of the kotatsu or the output state of the heater 1 is maintained at a constant temperature or a constant output that is lower than the rated output, or is in an unstable state where it is changing, can be checked using the external controller 9. This is determined by control processing such as checking the secondary voltage of the current transformer or checking the temperature. 1. For example, if the output of the heater is lower than the rated output. The temperature is also controlled to lower the 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.

P Effects of the Invention According to the present invention, the output of the heater that supplies electricity to the kotatsu is reduced below the rated output, unlike the conventional method of controlling the temperature of the kotatsu to maintain a constant temperature. The temperature of the kotatsu is further controlled by determining whether the output is constant or the temperature inside the kotatsu is constant.

The temperature inside the kotatsu is maintained at the set temperature, and the warmth during heating is the same as before, but when no one is inside the kotatsu, the temperature inside the kotatsu is already lower than the set temperature or the rated output of the heater. When held for a certain period of time,
Since the temperature of the kotatsu is lowered, there is no need to use wasted electricity to maintain a high temperature when no one is in the room.
It saves energy.

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.

In addition, the air flow inside the kotatsu is such that warm air is first blown out from the 9 heating element units to the outer periphery, and after it reaches the outer periphery and reaches 0P, it is sucked in from the center. They came in.

It is now possible to reliably detect disturbances in the temperature inside the kotatsu due to the formation of gaps.

In addition, we monitor two characteristics to determine whether there is a person taking warmth: the temperature inside the kotatsu, which is reliably detected by a temperature sensor, and the output, which is phase-controlled by a control circuit and changes almost continuously. , it becomes more accurate to determine whether there is a person taking heat.

Furthermore, by keeping an eye on these two characteristics.

The presence/absence determination can be speeded up, and the determination can be made moment by moment without having to carefully determine one characteristic.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view of essential parts of an electric kotatsu showing an embodiment of the present invention, Fig. 2 is a temperature and output characteristic diagram of electric kotatsu showing a conventional example and an embodiment of the present invention, and Fig. 6 is a sectional view of the main part of an electric kotatsu showing an embodiment of the present invention. FIG. 4 is a cross-sectional view of a main part of an electric kotatsu showing an entire embodiment of the invention, and FIG. 4 is a block diagram of a control device used in the electric kotatsu. 11 P 1... Heater, 2... Air blower. 5... Temperature sensor, 7... Heating unit. 10... Control circuit.

Claims (1)

[Claims] A heating element unit (7) consisting of a heater (1) and a temperature sensor (5) that captures the temperature inside the kotatsu, and a control circuit (10) that controls the heater (1) in response to a signal from the temperature sensor (5). In an electric kotatsu consisting of a temperature sensor (
5) electrically monitors whether the output of this heater (1) is lower than the rated output, maintains a constant output or the temperature inside the kotatsu saturated at the set temperature, or changes. It is equipped with a control circuit (10) that determines whether the output or temperature is unstable and controls the temperature inside the kotatsu. An electric kotatsu characterized in that a blower device (2) is provided inside the heat generating unit (7) so as to blow air toward the heating unit (7) and suck air from the center of the lower surface of the heat generating unit (7).