JPS62178844A - Electric foot warmer - Google Patents

Abstract

PURPOSE:To sensitively detect the presence or absence of any one warming oneself in a foot warmer, and to decrease the temperature of the foot warmer when no one is present therein thereby to save wastful consumption of power by providing a blower so that air is sucked up from the center of the lower surface of a heating unit and blown off toward the outer periphery of the foot warmer. CONSTITUTION:Whether the output of a heater 1 holds a predetermined value or it is under a varied unstable condition, is judged by control processing such as the secondary side voltage checking of a current transformer within an outside control unit. For example, if the output condition of the heater is as predetermined, it is judged that there is no one who warms oneself in a foot warmer and a temperature control to lower the temperature of the foot warmer to a temperature which is lower than the initially set temperature. In this case, air of a heating unit 7 is blown off through a suction port 62 toward the outer periphery of the foot warmer by means of a blower 2, and circulates around the entire periphery of the foot warmer and is made into a flow sucked within the heating unit 7 through a suction port 61 at the central part of the foot warmer, whereby the disturbance of the output of the heater 1 due to the entrance of one from the outer periphery or generation of a clear ance can be caught precisely.

Description

[Detailed description of the invention] Industrial applications The present invention provides an electric kettle P for heating in winter in general households. This is related to one thing.

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. Sensors controlled the output of the guard and heater to maintain the desired temperature.

Heater output control devices that are correlated with this temperature sensor include those that use a thermostand to directly control the energization of the heater, and those that use a semiconductor sensor to measure the temperature and control the heater using an electronic circuit such as a one-phase control method. These were things that controlled output. There are other methods such as controlling the air volume, but it is a one-phase control method and is set to a certain temperature scale.

Looking at the temperature change inside the kotatsu and the change in the output of the heater after the switch was turned on, all methods had temperature or output characteristics as shown by the dotted line in Figure 2.

3P In other words, when you turn on the switch, the heater and air blower work to raise the temperature inside the kotatsu, and when it eventually reaches the desired set temperature, the temperature sensor controls the output to the heater to keep the temperature inside the kotatsu constant from then on. It worked to keep it safe.

Problems to be Solved by the Invention In the conventional technology as described above, the temperature of the electric kotatsu is kept at the desired temperature after it has been turned on and heated to the desired temperature. there were.

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

Therefore, it would be good 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 level. Although it is warm and comfortable when there is a person taking the heat, maintaining a high temperature when there is no person taking the heat means high electricity costs and energy loss. This had negative effects such as shortening the life of parts.

Means to Solve the Problems In order to solve the problems seen in the conventional example, we developed a kotatsu with a heat generating 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 someone is lying down inside the kotatsu. At certain times of the day, the temperature of the air flowing through this air path remains constant at the set temperature, and the output of the heater that correlates with the temperature sensor also remains constant, allowing people to warm themselves to enter and leave the kotatsu. In the case of movement, etc. - Pay attention to the characteristic that the temperature of the air flowing through this air path and the output of the heater that correlates to this change, and check whether it is a constant output or an unstable output that is changing. Depending on the temperature, the set temperature inside the kotatsu is maintained or changed.1 For example, if there is no one taking the heat, the temperature can be lowered.A control device with a control circuit is installed to control the heating element. This problem is solved by installing an air blower inside the heating element unit so that the air blows out toward the outer periphery.

For production P 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 and the inside of the kotatsu warms up, and the temperature sensor monitors the temperature.

When the set temperature is reached, the output of 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, it depends on whether the temperature of the temperature sensor installed in the air path is at a constant temperature, or is in an unstable temperature state such as rising, falling, or changing up and down. A separate control circuit determines the change in heater output.

P This is 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 will reach the set temperature and 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 sensor installed in the air path becomes unstable or the temperature of the air flowing through the air path drops or becomes unstable, the output of the heater that correlates to this temperature sensor also becomes unstable, and this output It senses changing conditions and controls to maintain the set temperature.

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

1 is a lamp-shaped heater made of a rod-shaped quartz tube, and 05, which is formed on both sides of the blower device 2 consisting of a fan 6 and a motor 4, is a temperature sensor that detects the temperature inside the heater 1. 2 is a signal source for controlling the output of the suction port 6 in the heating element unit 7.
It is installed in part 1 of the wind path. 7 is a heating element unit consisting of the heater 1, the air bag @2, the temperature sensor 5, etc. A suction port 61 is provided at the center of the guard 63, and an air outlet 62 is provided at the outer circumference of the guard 63. Aru 08
This is a tower with G-shaped legs at the four corners.A heating element unit 7 is attached to the back of the center of the tower.(A) shows the flow of air in the heating element unit 7 section by the air blower 2, and the suction port 62 This figure shows the flow of air that blows out toward the outer circumference of the kotatsu, then goes around the entire inside of the kotatsu and is sucked into the heating element unit Z from the suction port 61 in the center. 81 is a futon, and -) indicates the flow of air inside the kotatsu while it is operating as a kotatsu. 9 is the control controller.

The apparatus includes a control device 11 having a control circuit 10 that controls the output of the heater 1 in order to set the temperature inside the kotatsu based on a signal from the 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, it is determined whether the output state of the heater 1 is maintaining a constant output or is changing and is in an unstable state through control processing such as checking the secondary side voltage of the current transformer in the external control controller 9. For example, if the output state of the heater 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 on the side of the suction port 61, so it can monitor the temperature of the kotatsu most accurately.

Effects of the Invention According to the present invention, ・In contrast to the conventional method of controlling the temperature of the kotatsu to maintain a constant temperature at all times, ・It is determined whether the output of the heater that is energized to the kotatsu is in a constant output state or not. The kotatsu temperature P is further controlled by

The temperature inside the kotatsu is maintained at the set temperature, and the warmth during heating is the same as before, but if there are no 9 people in the kotatsu and the temperature inside the kotatsu has already maintained the set temperature for a certain period of time, the temperature of the kotatsu will change. This reduces the temperature of the kotatsu, so there is no need to waste electricity to maintain a high temperature when no one is in the room, which saves energy.In addition, the temperature of the kotatsu automatically lowers when no one is in the room, making it safer. This is a useful feature, such as when 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 two heating element units to the outer periphery, and then sucked in from the center after reaching the outer periphery. Or.

It is now possible to reliably detect disturbances in the temperature of the kotatsu due to the generation of gaps as disturbances in the output of the heater.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view of 0P main 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 4th sectional view of the main parts of an electric kotatsu showing the entire embodiment of the present invention
The figure is a block diagram of a control device used in the electric kotatsu. 1... Heater, 2... Air blower. 5... Temperature sensor, 7... Heating unit. 10... Control circuit, 11... Control device.

Claims (1)

[Claims] A heating element unit (7) consisting of an air blower (2), a heater (1), and a temperature sensor (5) that detects the temperature inside the kotatsu, and receives a signal from the temperature sensor (5) to control the output of the heater (1). In an electric kotatsu comprising a control device (11) having a control circuit (10) for controlling the heater (1), the output of the heater (1) is electrically monitored.
A control device (11) is provided which further controls the temperature inside the kotatsu by determining whether the output is kept at a constant level or is in an unstable output state where the output is lower than the rated output. It is equipped with a heating element unit (7
) from the outer periphery of the kotatsu, and the air blower (2
) is provided in the heating element unit (7).