JPH01217125A - Room temperature controller for warm-air heating machine and the like - Google Patents

Abstract

PURPOSE:To realize economical and comfortable room heating environment in a short period of time, by a method wherein a proportional valve current-increasing means is operated to increase the value of current, conducted through the proportional valve of fuel supply, by a predetermined value exceeding the rated output value when a room temperature is lower than a predetermined temperature upon starting operation. CONSTITUTION:When a room temperature is lower than a predetermined temperature T, which has been programed in a micro-computer 1 upon starting operation, a proportional valve current increasing means 14 is actuated by a timer means 19 to operate the title heating machine while increasing the output of room heating from a rated maximum output Km to an output Ka. When the room temperature is higher than the predetermined temperature, the temperature control is effected so as to obtain a set temperature Ts by an output within the range of a rated output. The operation of the proportional valve current increasing means 14 is stopped after a predetermined time (talpha) by the timer means 19 after starting the operation of the machine with the output Kalpha and temperature control within the range of the normal rated output is effected, however, the proportional valve current increasing means 14 is stopped by a signal from a room temperature deciding means 20 when the room temperature has arrived at the set temperature Ts within a predetermined time (talpha), thereafter, the temperature control with the range of the normal rated output may be effected.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a room temperature control device for a hot air heater or the like.

Conventional technology Conventionally, hot-air heaters equipped with gas proportional valves controlled the heating output by changing between the rated maximum output and the rated minimum output depending on the heating load. Therefore, at the beginning of operation, since the room temperature is lower than the set temperature, the heating output becomes the rated maximum output, and the heating output is operated at the rated maximum output until the room temperature approaches the set temperature.

Problems that the invention aims to solve In general, with the above-mentioned conventional hot air heaters, the speed at which the room temperature rises is determined by the maximum rated output of the appliance, and even if you want to quickly warm up the room in cold winters, severe cold, or when unexpected guests arrive, it will take a while. It was time consuming and very inconvenient to use.

In view of the above-mentioned problems, the present invention operates at a rate exceeding the maximum rated output of the appliance for a predetermined period of time if the room temperature is below a predetermined temperature at the start of operation, and resumes normal operation when the room temperature reaches the set temperature. To provide an axillary air heater that can greatly accelerate the rise of room temperature by returning to normal temperature.

Means for Solving the Issues In order to achieve the above object, the hot air heater of the present invention includes: a room temperature detection means for detecting the indoor temperature; a room temperature setting means for setting the indoor temperature; and a room temperature setting means for setting the indoor temperature. combustion amount calculation means for outputting a voltage signal corresponding to the required combustion output based on the set indoor temperature and the signal from the room temperature detected by the room temperature detection means; a voltage-to-current conversion means for converting into current; a proportional valve for controlling the amount of fuel supplied to the combustion section according to the current value flowing through the coil; and increasing the current value flowing through the proportional valve by a predetermined value from the rated output value. a proportional valve current increasing means for increasing the proportional valve current, and a timer means for operating the proportional valve current increasing means for a predetermined period of time;
Room temperature determination means for stopping the operation of the proportional valve current increasing means when the signal from the room temperature detection means becomes equal to or higher than the signal from the room temperature setting means, and controlling the entire control from ignition to combustion. This configuration includes a sequence control means.

According to the above-described configuration, the present invention operates the proportional valve current increasing means to increase the current value flowing through the gas proportional valve by a predetermined value from the rated output value if the room temperature is below a predetermined temperature at the start of operation. As a result, the output of the hot air heater is increased by a predetermined value from the rated maximum output to start operation, and when the room temperature reaches the set temperature, it returns to normal operation, thereby significantly speeding up the temperature rise of the room temperature. become.

EXAMPLE An example of the present invention will be described below with reference to the drawings.

In Figure 1, 1 is a microcomputer with a CPU
It is a so-called one-chip microcomputer having a ROM, a RAM 1, and an input/output section, and the operation sequence of the warm air heater is programmed and built-in. Reference numeral 2 denotes a room temperature detection means consisting of an electronic equivalent including a thermistor, and 3 a room temperature setting means, the output signal of which is inputted to the combustion amount calculation means 4 in the microcomputer 1 together with the signal output from the room temperature detection means 2. The combustion amount calculation means 4 calculates the required combustion amount (the combustion amount of the burner of the hot air generating means that exchanges combustion heat and blows out hot air with a convection fan) based on the difference between the set room temperature and the room temperature. E Output voltage signal. 5 is a D/A converter which converts the digital signal from the combustion amount calculation means 4 into an analog signal. Reference numeral 13 denotes voltage-to-current converting means, which converts the voltage signal from the D/A converter 5 into a current signal to be passed through the gas proportional valve 12. To explain its internal configuration, reference numeral 6 constitutes a voltage follower by an operational amplifier, and is connected to a non-inverting input terminal of an operational amplifier 7. A resistor 8 limits the output current of the operational amplifier 7 to protect the output terminal, and a transistor 9 controls the current flowing to the gas proportional valve 12. A resistor 10 generates a voltage proportional to the current value flowing through the gas proportional valve 12, and reads it directly to the inverting input terminal of the operational amplifier 7 via a resistor 11.

Therefore, the operational amplifier 7 operates as a positive-phase amplifier, and the voltage at the output terminal increases until the voltage at the non-inverting input terminal and the voltage at the inverting input terminal become equal.As a result, the base current of the transistor 9 increases and the gas proportional valve 12 is increased. When the voltage generated across the resistor 10 enters the inverting input terminal via the resistor 11 and becomes equal to the voltage at the non-inverting input terminal, the voltage at the output terminal stops increasing and maintains this state. Next, 14 is a proportional valve current increasing means,
Resistor 15 based on the signal from microcomputer 1
It is connected to the base of transistor 1B via.

16 is a base bias resistor, and 17 is a resistor, which is connected in parallel to the series circuit of resistors 10 and 11 of the voltage-current converting means 13 when the transistor 18 is ON/L. As a result, the voltage at the inverting input terminal of the operational amplifier 7 decreases, and the current flowing through the gas proportional valve 12 further increases.

Reference numeral 19 indicates a timer means programmed in the microcomputer 1, which controls the proportional valve current increasing means 14 for a predetermined period of time.
It works to make things work. Reference numeral 2o denotes room temperature determining means, which operates to stop the proportional valve current increasing means 14 when the signal from the room temperature detecting means 2 becomes equal to or greater than the signal from the room temperature setting means 3. 21 is a sequence control means which controls a series of sequence control' from ignition to combustion.

Fig. 2 shows the operation flow of an embodiment of the present invention, Fig. 3 1, b
shows the change in power and temperature over time. At the start of operation, if the room temperature is lower than the predetermined temperature T programmed in the microcomputer 1, the timer means 19 shown in FIG. 1 operates the proportional valve current increasing means 14 to increase the heating output by α.
drive with

If the room temperature is higher than the predetermined temperature T, temperature control is performed so that the output falls within the rated output range and reaches the set temperature Ts.

After starting operation with the output α, the timer means 19 stops the operation of the incremental proportional valve current increasing means 14 for a predetermined time tα, and the temperature is controlled within the normal rated output range. When the set temperature T1 is reached, the operation of the proportional valve current increasing means 14 is stopped by a signal from the room temperature determining means 20, and the temperature is controlled within the normal rated output range.

According to the configuration of the above embodiment, at the start of operation, if the room temperature is below a predetermined temperature, the proportional valve current increasing means 14 is caused to operate taU for a predetermined time by the timer means 19, and the heating output is increased from m to α to the rated maximum output. As a result, the rise in room temperature is as shown at 8 in Fig. 3(b) (as shown by the conventional dotted line A
This makes it possible to speed up the time by tβ.

Although the above embodiment is an example of a hot air heater, the present invention can also be applied to an air conditioner or the like.

In addition to the effects of the invention, as is clear from the examples, the present invention operates the proportional valve current increasing means for a predetermined time to increase the current value flowing through the fuel supply proportional valve if the room temperature is below a predetermined temperature at the start of operation. As a result, the output of the warm air heater is increased by a predetermined value from the rated maximum output, making it possible to significantly accelerate the rise in temperature of the room temperature, and also to raise the room temperature within a predetermined time. When the temperature reaches the set temperature, the temperature control is returned to within the rated output at that point, and a very economical and comfortable heating environment can be realized in a short time without heating more than necessary. Therefore, during cold winters and severe cold,
Alternatively, it is possible to realize a very convenient and easy-to-use hot air heater that can quickly and economically heat a room when unexpected guests arrive.

[Brief explanation of the drawing]

FIG. 1 is a circuit block diagram showing one embodiment of the present invention, and FIG.
The figure is an operation flow diagram showing one embodiment of the present invention, and FIG.
Xb) shows a graph explaining the temporal change in heating output and temperature. 1...Microcomputer, 2...
Room temperature detection means, 3...Room temperature setting means, 4...
. . . Combustion amount calculation means, 12 . . . Proportional valve, 13
... Voltage-current conversion means, 14 ... Proportional valve current increasing means, 19 ... Timer means, 2
o...Room temperature determination means. Name of agent: Patent attorney Toshi Nakao, male, idiot 1 person wE
2rl! J 1 to 3 figures CQ)

Claims (1)

[Claims] a room temperature detection means for detecting an indoor temperature; a room temperature setting means for setting the indoor temperature; combustion amount calculation means for outputting a voltage signal; voltage-current conversion means for converting the voltage signal from the gas amount calculation means into a current flowing through the proportional valve; and fuel supply to the combustion section according to the value of the current flowing through the coil. a proportional valve whose amount is controlled; a proportional valve current increasing means for increasing the current value flowing through the proportional valve by a predetermined value from the rated output value; a timer means for operating the proportional valve current increasing means for a predetermined time; Room temperature determining means for stopping the operation of the proportional valve current increasing means when the signal from the detecting means becomes equal to or higher than the signal from the room temperature setting means;
A room temperature control device for a hot-air heater, etc., characterized by comprising a sequence control means that controls the entire control from ignition to combustion.