JPH0257821A - Room temperature control device for hot air heater and the like - Google Patents

Abstract

PURPOSE:To promote a rising of a room temperature by a method wherein when an operation is started, if a room temperature is less than a predetermined temperature, a current value flowing in a proportional valve is increased to increase output of a hot air heater, the number of revolutions of an air blowing motor is reduced and the operation is started, and then the operation is returned to its normal operation after the room temperature reaches a set temperature. CONSTITUTION:When an operation is started, if a room temperature is lower than a predetermined temperature T programmed in a micro-computer 1, a proportional valve current increasing means 14 is operated by a timer means 19, an amount of combustion is defined as K + a, and the number of revolutions of the air blower motor is defined as N - b. After the operation is started under this condition, an operation of the current increasing means 14 is stopped after a predetermined time (ta) by a timer means 19, then the operation of the current increasing means 14 is stopped to control a temperature within a normal range of rated output. However, when the room temperature reaches a predetermined temperature Ts within a predetermined period of time (ta), the operation of the current increasing means 14 is stopped with a signal from a room temperature discriminating means 22 and at the same time an air blower motor output setting means 20 may set the number of revolutions of the air blower motor corresponding to a combustion output and then a temperature control within a range of normal rated output is carried out.

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 proportional valves controlled the heating output by changing between the rated maximum output and the rated minimum output according to the heating load. Therefore, at the beginning of operation, since the room temperature is lower than the room temperature 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 reaches the set temperature.

Problems to be Solved by the Invention In general, with the above-mentioned conventional hot air heaters, the speed at which the room temperature rises is determined by the rated maximum output of the device LL. However, it took some time and was very inconvenient to use.

In view of the above problems, the present invention operates by exceeding the rated maximum output of the appliance and lowering the rotational speed of the blower by a predetermined number of rotations for a limited period of time if the room temperature is below a predetermined temperature at the start of operation,
To provide a hot air heater that can greatly accelerate the rise in room temperature by returning to normal operation when the room temperature reaches a set temperature.

Means for Solving the Problems 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 temperature setting means set by the room temperature setting means. a heat amount calculation means that outputs a voltage signal corresponding to the required heat output based on the set room temperature and a signal from the room temperature detected by the room temperature detection means; and a heat amount calculation means that converts the voltage signal from the heat amount calculation means into a current flowing through the proportional valve. A voltage-current conversion means, a proportional valve that controls the amount of fuel supplied to the heat source according to the current value flowing through the coil, and a proportional valve that increases the current value flowing through the proportional valve by a predetermined value from the rated value. current increasing means; timer means for operating the proportional valve current increasing means for a predetermined period of time; and determining a rotational speed of the blower motor corresponding to the combustion output, and reducing the rotational speed by a predetermined value while the proportional valve current increasing means is in operation. and 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 greater than the signal from the room temperature setting means. It is the composition.

According to the above-described configuration, the present invention operates the proportional valve current increasing means to increase the current value flowing through the 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. The output of the wind heater is increased above the rated maximum output and the rotation speed of the blower motor is lowered by a predetermined value to raise the hot air temperature and start operation, and when the room temperature reaches the set temperature, normal operation is resumed. By doing so, it will work to significantly speed up the rise in room temperature.

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

In Figure 1, 1 is a microcomputer with cpu%
It is a so-called one-chip microphone having ROM, RAM, 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 detecting means consisting of an electronic circuit including a thermistor, and 3 a room temperature setting means whose output signal is inputted to the combustion amount calculating means 4 in the microcomputer 1 together with the signal output from the room temperature detecting means 2. The combustion amount calculation means 4 calculates the required combustion amount based on the difference between the set room temperature and the room temperature (the combustion amount of the burner of the hot air generating means that exchanges combustion heat and blows out hot air with the blower fan).
is calculated and outputs a 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, 6 constitutes a voltage follower with an operational amplifier, and operational amplifier 7 constitutes a voltage follower.
is connected to the non-inverting input terminal of 8 is a resistor which limits the output current of the operational amplifier 7 to protect the output terminal;
is a transistor that controls the current flowing to the gas proportional valve 12. 10 is a resistor that generates a voltage proportional to the current flowing through the gas proportional valve 12 and is connected to the operational amplifier 7 via the resistor 11.
is connected to the inverting input terminal of 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 (and the resistance 1
When the voltage generated across the output terminal 0 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 that state. Next 1
4 is a proportional valve current increasing means, which is connected to the base of the transistor 18 via a resistor 15 based on a signal from the microcomputer 1. 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 conversion means 13 when the transistor 18 is turned on. 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. 19 is a timer means programmed in the microcomputer 1, which operates the proportional valve current increasing means 14 for a predetermined period of time. 2
0 is a blower motor output setting means which determines the rotational speed of the blower motor corresponding to the output of the combustion amount calculating means 4 and operates to reduce the rotational speed by a predetermined value while the proportional valve current increasing means 14 is operating. . Reference numeral 21 denotes a blower motor drive means for rotating a blower motor (not shown) in response to a signal from the blower motor output setting means 20.

Reference numeral 22 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. 23 is a sequence control means that controls a series of sequence controls from ignition to combustion.

Figure 2 shows the operation flow of an embodiment of the present invention, and Figure 3 (ml
, tb) shows the change in the output of the warm air heater and the room temperature over time. At the start of operation, if the room temperature is lower than a predetermined temperature T programmed in the microcomputer 1, the timer means 19 shown in FIG. Operate with N-tl. On the other hand, if the room temperature is higher than the predetermined temperature T, the temperature is controlled to reach the set temperature Ts with an output within the rated output range (combustion amount=N, blower motor rotation speed=N). After starting operation with the output +1 and the blower motor rotation speed N-b, the timer means 19 stops the operation of the proportional valve current increasing means 14 after a predetermined time ta, and the temperature is controlled within the normal rated output range. However, when the room temperature reaches the set temperature Ts within a predetermined time ta, the operation of the proportional valve current increasing means 14 is stopped by a signal from the room temperature determining means 22, and at the same time, the blower motor output setting means 20 is set to correspond to the combustion output. Temperature control is performed within the normal rated output range by setting the rotation speed of the blower motor.

According to the configuration of the above embodiment, at the start of operation, if the room temperature is below a predetermined temperature, the timer means 19 is activated for a predetermined time tm.
By operating the proportional valve current increasing means 14 to increase the heating output from m to 11 from the rated maximum output and decrease the fan motor rotation speed from the rated maximum rotation speed N to N-1,
The rise of the room temperature is as shown in the day fb) in Fig. 3 (this can be achieved by making the time tb faster than the conventional A shown by the broken line).

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.

Effects of the Invention As is clear from the examples above, the present invention has the advantage that, at the start of operation,
If the room temperature is below a predetermined temperature, the proportional valve current increasing means is operated for a predetermined period of time to increase the current value flowing through the fuel supply proportional valve by a predetermined value from the rated output value, and at the same time, the rotation speed of the blower motor is increased to a predetermined value. By operating at a lower temperature, it is possible to significantly accelerate the rise in room temperature, and when the room temperature reaches the set temperature within a predetermined time, the temperature control is returned to within the rated output at that point and heating is performed more than necessary. (It is a very economical and comfortable heating environment that can be achieved in a short period of time. Therefore, it is very convenient and easy to use because it can quickly and economically heat the room during cold winters, severe cold, or when unexpected guests arrive.) This makes it possible to realize a hot air heater with good quality.

[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 an embodiment of the present invention, and FIG.
), (Is) show graphs explaining the temporal changes 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. Song/voltage-current conversion means, 14... Proportional valve current increasing means, 19... Timer means, 20...
Air blower motor output setting means, 22...Room temperature determination means. Name of agent: Patent attorney Shigetaka Awano (1 person)

Claims (1)

[Claims] a room temperature detection means for detecting an indoor temperature; a room temperature setting means for setting the indoor temperature; A combustion amount calculation means for outputting a voltage signal, a voltage-current conversion means for converting the voltage signal from the combustion amount calculation means into a current flowing through the proportional valve, and a 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 a rated output value; a timer means for operating the proportional valve current increasing means for a predetermined time; and a combustion output. a blower motor output setting means that determines the rotational speed of the blower motor corresponding to the rotation speed and reduces the rotational speed by a predetermined value while the proportional valve current increasing means is in operation; A hot-air heater characterized by comprising room temperature determining means for stopping the operation of the proportional valve current increasing means when the current is equal to or higher than the signal, and a sequence control means for controlling the entire control from ignition to combustion. Room temperature control device for machines, etc.