JPS6115042A - Hot air heater for feet - Google Patents

Abstract

PURPOSE:To make a convenient manner of use of a hot air heater for feet by a method wherein a room temperature is sensed and the desired temperature in a hot air heater is varied in response to the room temperature. CONSTITUTION:A temperature (t) in a hot air heater is inputted to an input circuit 12 from a temperature sensing circuit 14 through input terminal 21 of a microcomputer 8 and A/D converter 9. In turn, the room temperature 16 is inputted to the microcomputer 8 and then the desired temperature T1 of hot air heater of a hot air heater setting circuit 18 is sequentially corrected to T2 in response to the room tempeature. This corrected setting temperature T2 is inputted to the microcomputer 8, compared with a measured hot air heater temperature (t) and then reached to the desired temperature, at this time an output terminal 24 of the microcomputer becomes Low and a transistor 26 is turned off, bidirectional thyristor 28 becomes nonconductive and then the heating of the hot air heater is stopped. With this arrangement, it is not necessary to vary the predetermined temperature of hot air heater in response to the variation in room temperature, resulting in that a convenient manner of operation of the hot air heater can be assured.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention controls the temperature inside the kotatsu using a detection signal from a temperature sensor inside the kotatsu, and changes the temperature inside the kotatsu according to the room temperature using the detection signal from a room temperature detector. This is about a heated warm air kotatsu.

[Prior art]

In conventional warm air kotatsu, the temperature inside the kotatsu is controlled by warm IJ[
[The temperature was set using a knob and was detected and controlled by a temperature detector, and as shown in FIG. 1, the temperature was controlled to be constant regardless of the room temperature. However, in general, for people who keep warm, the optimum temperature of a kotatsu will become higher as the ambient temperature (room temperature) falls, and lower as the ambient temperature rises.

Therefore, it is necessary to change the temperature of the kotatsu according to changes in the room temperature, and in the past, it was necessary to change the position of the gI1 node knob every time to change the set temperature of the kotatsu, which was troublesome.

[Summary of the invention]

The present invention was made in order to eliminate the above-mentioned conventional drawbacks.) The present invention detects the room temperature using a temperature sensor in the controller connected outside the kotatsu and automatically corrects the room temperature. To provide a hot air kotatsu that does not require manual adjustment of set temperature according to changes and allows easy temperature control.

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 3, numeral 1 is a kotatsu yagura, inside which a heating element 2 consisting of a positive temperature coefficient thermistor, an air blower 3, and a first temperature detector 4 for detecting the temperature inside the kotatsu are provided. The heating element 2 is installed in the air flow path of the blower 3 to form a hot air generator. Moreover, 5 is a controller provided in the room outside the lidded glass 1, and a second temperature detector 6 for detecting the room temperature is provided inside the controller 5. Reference numeral 7 denotes a temperature control means also provided indoors, and the temperature control means 7 controls the heating element 2 by receiving the detection signals from the temperature detectors 4 and 6 as input.

FIG. 4 shows a microcomputer consisting of the electric circuit 11, input circuit 12 and output circuit 13 of the warm air kotatsu shown in FIG. A circuit, 16 is a room temperature detection circuit consisting of a second temperature detector 6 and a voltage dividing resistor 17 built in the controller 5 that supplies power to the kotatsu from the outside, and 18 is a variable resistor 20 for changing the setting temperature and a voltage dividing resistor. This is a kotatsu temperature setting circuit consisting of 19 components. Further, 21 to 23 are input terminals of the A7o converter 9 built into the microcomputer 8,
The analog potentials from the kotatsu internal temperature detection circuit 14, the room temperature detection circuit 16, and the kotatsu temperature setting circuit 18 are respectively input to the converter 9 to convert them into desotal values. The temperature control means 7 includes a microcomputer 8 and its input terminal 21.
~23, output terminal 24, resistor 25, transistor 26,
It is composed of a resistor 27, a bidirectional thyristor 28, and a heating element 2. 29 is a music frequency power supply.

Next, the operation of the above device will be explained with reference to FIG. FIG. 5 is a flowchart showing a temperature control program stored in the memory 10 of the microcomputer 8.

First, when starting, the output terminal 24 of the microcomputer 8 becomes HighK, the transistor 25 is turned on through the resistor 25, the dart current of the bidirectional thyristor 28 flows through the resistor 27, and the bidirectional thyristor 28 is turned on. Then, the main current flows through the heating element 2, raising the temperature inside the kotatsu (step 30). The temperature t inside the kotatsu is sequentially input from a temperature detection circuit 14 comprising a first temperature detector 4 and a voltage dividing resistor 15 to an input circuit 12 via an input terminal 21 of a microcomputer 8 and a converter 9. or,
The set temperature T+ is input from the kotatsu temperature setting circuit 18 to the microcomputer 8 as described above. The room temperature is input from the room temperature detection circuit 16 to the microcomputer 8, and the set temperature T1 is sequentially corrected to T2 according to the room temperature (step 32). As shown in Figure 2, correction of the set temperature due to changes in room temperature is performed by increasing the set temperature by 1°C for every 1°C decrease in the actual room temperature, for example, within the range of 5 to 20°C. The microcomputer 8 is programmed to maintain a constant temperature without making corrections when the room temperature is above 20° C. and below 5° C. (step 31).

The temperature t inside the kotatsu rises, and the set temperature W T is corrected for the room temperature.
When reaching z (step 33), the microcomputer 8
The output terminal 24 of the transistor 26 is turned off, and the bidirectional thyristor 28 becomes non-conducting.
The power supply to the heating element 2 is stopped (step 34).

If the temperature inside the kotatsu falls (step 35), the output terminal 24 of the microcomputer 8 goes high again, and by repeating this operation, the temperature inside the kotatsu is kept constant.

Note that the reason why the room temperature correction range is defined as described above and the set temperature is kept constant without performing temperature correction in the high and low room temperature regions is that the second temperature sensor 6 may be covered with a futon or the like and become a high room temperature. This is to prevent the temperature inside the kotatsu from dropping rapidly in the event of misuse, that is, in the case of misuse, and to suppress the maximum temperature rise in the low room temperature region for safety reasons.

Further, in the above embodiment, a positive temperature coefficient thermistor is used as the heating element 2, but an ordinary infrared heater may also be used. Further, although the microcomputer 8 is used as the temperature control means 7, other hard circuits may be used.

〔Effect of the invention〕

As described above, in the present invention, the set temperature inside the kotatsu is automatically changed according to the room temperature, and there is no need for the warmer to manually change the set temperature, and appropriate temperature control can be easily realized. Furthermore, by limiting the temperature correction range, it is possible to prevent misuse and ensure safety.

[Brief explanation of drawings]

Figure 1 is a diagram of the relationship between the conventional room temperature and the temperature inside the kotatsu.
FIG. 2 is a diagram showing the relationship between the room temperature and the temperature inside the kotatsu according to the present invention, and FIGS. 3 to 5 are a block diagram, an electric circuit diagram, and a flowchart showing the operation of the hot air kotatsu according to the present invention, respectively. DESCRIPTION OF SYMBOLS 1... Kotatsu Yagura, 2... Heating element, 3... Air blower, 4... First temperature detector, 5... Controller, 6... Second temperature detector, 7 ...Temperature control means. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (3)

[Claims] (1) A hot air generator installed inside the kotatsu yagura and having a heating element in the air flow path of the blower, a first temperature detector that detects the temperature inside the kotatsu, and a kotatsu temperature setting that sets the temperature inside the kotatsu. In a warm air kotatsu equipped with a means for controlling the temperature inside the kotatsu to a set temperature, a second temperature detector for detecting room temperature is provided, and the set temperature is controlled to change according to the room temperature. A warm air kotatsu that is characterized by the following features: (2) The hot air kotatsu according to claim 1, wherein the set temperature is raised when the room temperature drops. (3) The warm air kotatsu according to claim 1 or 2, wherein the temperature range of the room temperature in which the set temperature is corrected is limited to the actual operating temperature range.