JPH04116A - Room temperature control device for combustion device - Google Patents

Abstract

PURPOSE:To keep a body felt temperature constant by a method wherein a thermistor for use in sensing a room temperature is heated by a near heater, a variation of resistance value of this thermistor is changed into a voltage variation and into a digital value and an amount of combustion is controlled by the converted value and a set value. CONSTITUTION:An operation SW is depressed, a heater 2 is electrically energized and a gasification device is heated. As a temperature of a gasification thermistor reaches 225 deg.C, an ignition instruction is outputted. A pump 3 is turned on with a pulse width of 5 msec and a frequency of 22Hz so as to start an operation. Kerosene is supplied to a burner through the gasification device, an ignition device 4 is operated for a specified period of time and the burner is ignited. The ignition device 4 is stopped after a specified period of time. When a certain period of 10 to 20 seconds elapses after an ignition instruction is outputted through a micro-computer 6, a fan motor 5 is operated, hot air is outputted to heat a room. At this time, a pulse frequency is varied through output ports 6-8 in response to an output from a comfortableness sensor 15 and the set temperature and a supplying amount of kerosene for the pump 3 is controlled. A body felt temperature becomes the same as that of the normal state.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a room temperature control device in a combustor, and more particularly to a room temperature detection device.

Conventional technology This type of conventional control device detects the room temperature using a thermistor, and controls the amount of combustion based on this room temperature and a preset temperature to keep the room temperature constant, or detects the room temperature using the thermistor. At the same time, humidity was detected by a humidity sensor, and the amount of combustion was controlled based on the room temperature, humidity, and temperature setting, so that the perceived temperature remained constant.

Problems to be Solved by the Invention Even if the room temperature is constant, humans feel cold when the wind speed is high. In other words, the sensible temperature feels lower. Also, even if you heat a cold room and the room temperature reaches the set temperature, people feel cold due to cold radiation. In other words, the sensible temperature feels lower. However, in the conventional method, only the room temperature is detected using a thermistor, so the effects of wind speed and cold radiation cannot be fed back. Therefore, there was a problem that it was cold even at the same temperature (room temperature) as in the steady state.

Means for Solving the Problems In the present invention, a heater is provided near a thermistor that detects room temperature, and the thermistor is heated to some extent by this heater. Converting this thermistor resistance change into a voltage change,
This value is converted from an analog value to a digital value by an A/D conversion circuit, and the combustion amount is controlled by a microcomputer based on this value and the set temperature (digital value). The lower the resistance value of the thermistor, the greater the amount of combustion.

Since the thermistor is heated by the heater adjacent to it, even if the room temperature is constant, if the wind speed is strong, the heating to the thermistor will be reduced, the (apparent) temperature of the thermistor will be lower, and the amount of combustion will increase. . Furthermore, even when the influence of cold radiation is large, heat is taken away from the heating of the heater, so the heating of the thermistor is reduced, the temperature of the thermistor is lowered, and the amount of combustion is increased. Therefore, the sensible temperature remains constant.

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

1 is a commercial power source, which includes a heater 2 for heating a vaporizer that vaporizes kerosene, a pump 3 for supplying kerosene, an igniter 4 for igniting a burner, and a hot air fan heater 5 for sending out burned gas as hot air. , supplies power to a DC power transformer 7, etc. of a microcomputer 6, etc. The output of the transformer 7 is rectified by a bridge diode 8, becomes a power supply 13 smoothed by a capacitor 9, and is supplied to a regulator lO,
A power supply 14 whose voltage is regulated by the capacitor 11 is provided.

The comfort sensor 15 is composed of a thermistor 16 and a heater 17, and is connected to a constant voltage power source via a voltage dividing resistor 18 to convert temperature into a resistance value and further into a voltage value (analog value). This voltage value is the output port low 1 of the microcomputer 6.
．． 6-2.6-3.6-4, input port low 5, resistance 1
9-26. In addition to the comparator 27, an A/D conversion circuit is configured to convert the digital value into a digital value and process it inside the microcomputer 6. Output ports 6 to 6-10 of the microcomputer 6 are connected to the phototriac 2 via drivers 28-1 to 28-5.
9, controls the relay 30, photocoupler 31, relay 32, and phototriac 33; Resistors 34-36 are limiting resistors and diodes 37-38 are flywheel diodes. The phototriac 34 is connected to a triac 40 via a resistor 39, and the heater 2 is controlled via the triac 40. The contacts of the relay 30 are connected to a bridge diode 41 and connected to a capacitor 4 through a limiting resistor 42.
3 to control the DC power supply for pump 3.

Resistors 44-50, Zener diode 51. Capacitor 52.53.5CR54,55, diode 56.57
．． 58 and a diac 59 constitute a one-shot multivibrator, and drive the pump 3. The input of the one-shot multivibrator is controlled by a photocoupler 31. That is, the operation of the one-shot multivibrator is such that when the photocoupler 31 is turned on, 5CR51 is turned on, and after a certain period of time has passed after the photocoupler 31 is turned off, 5CR54 is turned off. This is a circuit that calculates the sum of the on time and a certain fixed time.

The photocoupler 31 is turned on by a program in the microcomputer 6, and the time is set to approximately 1 SeC, and the frequency is set to 6.7 to 22 Hz.

A certain fixed time is defined by the charging time of the resistor 47, 48 and the capacitor 53, the breakover voltage of the diac 59, and the discharging time of the resistor 47 and the capacitor 53. Set this to about 4+asec. Relay 32 is a relay that controls igniter 4. Phototriac 3
3 is a phototriac that controls the fan motor 5. The program of the microcomputer 6 outputs an on signal from the output port low 6 of the microcomputer 6 when the operation switch (not shown) is pressed, turns on the driver 28-1, turns on the phototriac 29, and turns on the triac 40. let Since the triac 40 is turned on, the heater 2 is energized and heats the vaporizer. The temperature of the vaporizer is determined by the vaporization thermistor (
(not shown). The temperature of the vaporizer thermistor is 22
When the temperature reaches 5℃, the output port low of microcomputer 6 is 7.6-8
．． An ignition command is issued from 6-9 (6-7 is an on signal, 6-8 is a pulse signal, and 6-9 is an on signal for a fixed time of about 5 to 10 seconds). The driver 28-2 and relay 30 are turned on, and the driver 28-3 and photocoupler 31 are turned on in a pulsed manner, so the pump 3 has a pulse width of 5 m5ec and a frequency of 22H.
Turn it on with z (set it to this frequency when igniting). Pump 3 starts operating and the burner (not shown)
kerosene is supplied to the plant through a vaporizer. Driver 28-4
, the relay 32 is turned on, and the igniter 4 is operated for a certain period of time. The burner is therefore ignited. The igniter 4 stops after a certain period of time. When the temperature of the vaporizer thermistor reaches 280°C, the output port low 6 of the microcomputer 6 outputs an off signal.

Driver 28-1. The phototriac 34 and the triac 40 are turned off, and the power supply to the heater 2 is stopped.

Control the vaporizer temperature to be constant. Further, after a predetermined period of 10 to 20 seconds has passed after the microcomputer 6 issues the ignition command, an on signal is output from the output port low 10 to turn on the driver 28-5 and the phototriac 23. Then, the fan motor 5 operates and hot air is emitted to heat the room. At this time, the output of the comfort sensor 15 (thermistor 16
) and the set temperature, the pulse frequency is changed from the output port low 8 to control the amount of kerosene supplied to the burner of the pump 3. The amount of kerosene supplied to the burner of the pump 3 is based on when the room is in a steady state and there is no wind, and is stored in the memory of the microcomputer 6 in advance by the amount of temperature that will rise due to heating by the heater 17. Change your clothes,
Furthermore, the value converted into a digital value) is set so that the temperature obtained by subtracting the temperature rise caused by the heater 17 in steady state and no wind from the temperature of the thermistor 16 becomes equal to the set temperature (value converted to a digital voltage value inside the microcomputer). , the frequency is changed from the output port low 8, the frequency of the pump 3 is changed, and the amount of kerosene supplied to the burner is changed and controlled.

Since the present invention has the above configuration, that is, the combustion amount is controlled so that the temperature of the thermistor 15 of the comfort sensor 15 is constant (the temperature is increased by the heater 17 when the set temperature is 10 and there is no wind in a steady state).

Here, even if the temperature of the room reaches the set temperature immediately after the start of operation, the heater 17 of the comfort sensor 15 is affected by the cold radiation from the walls and floor, and the temperature rise at the thermistor 16 in a steady state with no wind. The temperature will also be low.

Therefore, since the temperature of the thermistor 16 (digital voltage value inside the microcomputer) is lower than the set temperature (digital voltage value inside the microcomputer), the microcomputer 6 outputs a pulse with a higher frequency than the output power low 8 in order to increase the temperature. The operating frequency of the pump 3 is increased to increase the amount of kerosene supplied and the amount of combustion.

Therefore, the temperature of the room will be higher than the set temperature, and the sensible temperature will be the same as the steady state temperature.

On the other hand, if there is a breeze, the perceived temperature will feel lower even though the temperature in the room is the same. However, when there is wind, the temperature of the thermistor 16 becomes lower because the heat of the beater 17 of the comfort sensor 15 is absorbed by the wind. Therefore, the microcomputer 6 outputs a pulse with a higher frequency than the output port low 8 in order to raise the temperature, and pump 3
Increase the operating frequency of the kerosene, increase the amount of kerosene supplied, and increase the amount of combustion. Therefore, the temperature of the room will be higher than in a state of no wind, and the sensible temperature will be the same as in a steady state of no wind. Naturally, in a steady state with no wind, the heat of the heater 17 of the comfort sensor 15 is not wasted, so the temperature of the room becomes equal to the set temperature, and the sensible temperature does not change.

That is, control is performed to keep the sensible temperature constant in any case.

Effects of the Invention According to the present invention, a method is adopted in which the thermistor is heated by a heater, the degree of heating is made to be influenced by cold radiation and wind, and correction is made accordingly, so that the perceived temperature remains constant. This improves comfort. Moreover, it does not require a complicated sensor.

[Brief explanation of drawings]

FIG. 1 is a wiring diagram showing one embodiment of the present invention. 3...Pump, 6...Microcomputer. 15... Comfort sensor, 16... Thermistor, 1
7... Heater. Applicant: Hitachi Hometech Co., Ltd.

Claims (1)

[Claims] In a room temperature control device that detects room temperature using a thermistor (16) and changes the combustion amount to bring the room temperature closer to a set temperature, a heater (1) for heating the thermistor (16) is provided.
7), a converter or microcomputer (6) that converts the resistance change of the thermistor (16) into voltage and further digitally converts it, and a digital converter inside the microcomputer (6), and reads the digital value;
A room temperature control device for a combustor, comprising a microcomputer (6) having a temperature control function by comparing it with a preset temperature.