JPS6036529B2 - How to adjust the room temperature of a warm air heater - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for controlling the room temperature of a hot air heater, which can automatically control the room temperature.

Conventionally, in hot air heaters that use kerosene, etc., when the capacity of heat generation is 3 or more, the normal temperature detection element can
One stage and one more stage were controlled by manual switches. In other words, a thermovolume and an on/off switch are provided. For example, if the on/off switch is set to "strong", the room temperature is sensed by a temperature detection element or a mechanical thermostat, and when the temperature exceeds a certain temperature, the on/off switch is turned off. The operation changes from low operation to low operation, and then when the temperature starts to drop, it returns to the original strong operation, and thereafter strong-low hunting combustion operation is performed between this temperature, but when the operation selector switch is set to ``low 1'' In this case, weak-OFF hunting combustion operation was performed at the same temperature as above (temperature set by the thermostat).However, in this case, the operating state must be switched manually, and for example, when heating If you forget to turn the operation selector switch to follow the change in room temperature when the heating load changes suddenly due to opening the door between the inner room and the next room, the room temperature may no longer match the room thermo set value. Alternatively, there is the disadvantage that the temperature exceeds the set value of the room thermostat, which also results in wasted fuel.The present invention was made in view of the above points, and even if the room temperature suddenly changes, The purpose of this system is to automatically change the operating conditions to keep up with the room temperature, maintain the room temperature at the set value of the room thermostat, and use fuel more effectively.

An embodiment of the present invention will be described below based on the drawings.

Figure 1 is a diagram of changes in room temperature, with time on the axis and room temperature on the vertical axis.The thick line shows when the heating load of the room to be heated is appropriate, and the string line shows A in the case of underload and B in the middle. Case C is shown when the heating load suddenly increases.

T is the setting level of the thermovolume installed on the front panel of the warm air heater, etc.
At the t3 level, "hunting of weak one-shot operation" is repeated, and this T is set as the desired room temperature set value (hereinafter referred to as the center value), and the temperature set value slightly higher than this center value (hereinafter referred to as the upper limit value) is set. L, and conversely, set the temperature slightly lower (
(hereinafter referred to as the lower limit). FIG. 2 is a temperature detection circuit showing an embodiment of the present invention, FIG. 3 is an output signal transition diagram of the temperature detection circuit, and FIG. 4 is an operation control circuit showing an embodiment of the present invention. In the figure, C is a comparator using a normal operational amplifier, etc., and is connected to a bleeder consisting of resistors R, , R2 and semi-fixed resistor VR connected in parallel to DC power supplies 1 and 1' via resistor side 3. Comparator C. It is connected to the positive input terminal of , and a comparison voltage V, is obtained.

Furthermore, a resistor R4 connected in parallel to the DC power supplies 1 and 1',
Room temperature detection element T such as thermovolume VR2 and thermistor
It is connected to the negative input terminal of a bleeder composed of H and a resistor R5 via a resistor R6, and obtains a room temperature detection voltage Vo. RT, is the output terminal of comparator C, and the load resistance R?
are connected. R8 is a bypass resistor connected in parallel with the above-mentioned room temperature detection element TH; Co is a bypass resistor connected in parallel with the above-mentioned room temperature detection element TH;
．． This is a bypass capacitor connected between the positive and negative input terminals of the The load-side input terminal of the comparator C is commonly connected to the negative-pole side input terminals of the comparators C2 and C3, respectively. Comparison voltage y of comparator C2
2 is a resistor R9, a semi-fixed resistor VR3, a resistor R. o and R,
．． The comparison voltage V3 of the comparator C3 is set by the bleeder and connected to the positive input terminal.
It is set by a bleeder consisting of a semi-fixed resistor VR4, resistors R, 5 and R, 6, and is connected to the positive input terminal. R
, 3 are feedback resistors for providing appropriate hysteresis. RT2 and RL are the output terminals of the comparators C2 and C3 with load resistances R,2 and R,7. In Figure 3, room temperature et al, t2, et al and t4
are t,,t2 in the room temperature change state diagram in Figure 1 above.
, t3 and t4, and the output "0" of the output terminals RT, , RT2 and RT3 of the comparators C, , C2 and C3
indicates the output "L" level, and the output "1" indicates the output "H" level. Next, the configuration of the operation control circuit shown in FIG. 4 will be explained. In the figure, 2-2' is a linear power supply, and R, 6, R, 9 are connected to the output terminal Rt of the comparator C3.
SC connected to the gate via a bleeder
When the anode of R is connected to the resistor R2o and the room temperature becomes t4 or more, that is, when Rt becomes "H" level, or even if the room temperature becomes below t4 afterwards, the SC
This constitutes a circuit A that holds the anode side B terminal of R at the "L" level.

Below, the above "H" and "L" levels will be omitted. When the room temperature becomes below t, that is, RT becomes "
This is to release the self-holding of the SCR when the signal becomes "L", and the collector of the NPN transistor Q2 is connected to the B terminal, the emitter is connected to the power supply 2' side, and the base is connected to the resistor R2. It is connected to the voltage dividing point of the resistor R22, and is connected to the collector of the PNP transistor Q through the comparator C4, which is connected to one end of the resistor R2, with the emitter connected to the power supply 2 side and the base connected to the resistor R24 and R25. It is connected to the output terminal RT of the comparator C.
The resistor 23 is for discharging the charge of the capacitor C4 after the PNP transistor Q is turned off. Circuit C includes an AND circuit Q4 having the output of the inverter Q having the B terminal as the input terminal and the above RT2 as the input terminal, and a NOR circuit Q5 having the output of the AND circuit Q4 and the above RT3 as the input terminals.
Resistors R26, R27, N drive the relay RY, which stops the operation of the hot air heater by the output of this OR circuit Q5.
It consists of a relay drive circuit consisting of a PN transistor Q6, and turns off the IJ relay RY under the following conditions.
That is, the combustion operation is stopped.

[a) When the room temperature is above 100 yen.

{b) When the room temperature remains at or above t2 even if the room temperature decreases (at least at least) after the room temperature reaches or above.

'c} After the room temperature exceeds 1, the room temperature drops (by more than 1,000 yen), drops to low level, shifts to low operation, and then rises to 100 degrees again.

The circuit consists of an inverter Q7 whose input terminal is the above RL, a NAND gate Q8 whose input terminals are the output of this inverter Q7 and the above B terminal, and the output of this NAND gate Q and A.
AND gate Q9 whose input terminal is the terminal (which becomes "L" during the pre-purge and ignition period)
Resistors R28 and R that drive relay RY3 that controls the operation of the warm air heater with strong heat generation amount and weak heat generation amount by the output of 9.
29, transistor Q,.

The relay RY3 operates under the following conditions. The iJ-ray RY3 is always turned off during the 'd' pre-purge and ignition period. [e'
If there is no history of the room temperature rising more than t, or if there is a history but the room temperature once drops to below t, and the same history is canceled, the switch will turn off and on between the room temperature and t4. let

{f} If there is a history of the room temperature rising more than 200 yen and the room temperature does not fall below 200 yen, relay RY3 is turned on. (g) Excluding the above operations 'e' and [during the pre-purge and ignition periods.

Next, the operation of the circuit with the above configuration will be explained.

First, the setting level of the thermovolume T is set to approximately the intermediate value between t2 and t3 by adjusting VR2,
Comparison voltages V, , V2 of comparators C, , C2 and C3
and V3 to the output terminals RT, , RT2 and RT3 shown in FIG. 3 corresponding to room temperature levels t, , t2, t3 and t4
A semi-fixed resistor VR, so that a predetermined output signal is output to
, VR3 and VR4 are adjusted in advance. Next, when the hot air heater operation switch (not shown) is turned on, the pre-purge and ignition operations begin. After this, if the overflow is rising without reaching t3, that is, if RT2 is "L", the output of the AND gate Q9 in the circuit 2 becomes "L", and the NPN transistors Q and o are turned off, which means that the relay RY3 is activated. If you don't do this, you will have to drive aggressively. After that, when the room temperature rises and reaches a certain point, that is, when RT2 becomes "H", the AND gate Q
The output of 9 becomes "H", and the NPN transistors Q and O are turned on, that is, the IJ relay RY3 is activated and the operation becomes weak. If combustion continues in this state or if the heating load suddenly decreases and the room temperature rises further and reaches t4, Rt will become "H".
”, and the output of Noah gate Q5 becomes “L”, so
The NPN transistor Q6 is turned off, that is, the relay RY does not operate, and the operation is stopped. Thereafter, when the room temperature gradually decreases and reaches t2, RL becomes "L" and weak operation begins. By the way, when it reaches t4, RT3 becomes "H".
”, the gate of the SCR is driven by the above circuit A, the SCR is turned on, and the anode, that is, the B terminal becomes “L”.
” status is maintained. In this state, the heating load suddenly increases, the room temperature drops, and t, hereinafter referred to as RT, becomes
When the signal becomes "L", the PNP transistor Q is turned on, and a current flows through the capacitor C4 and the resistor R24 to the base of the NPN transistor Q2, turning on Q2 and releasing the self-holding state of the SCR. In other words, the memory that the room temperature that is currently being heated has reached t4 is erased. Next, when the room temperature once rises to t4 or more (but not less than 1) and then decreases to t4 or more, that is, when B is "L" and RT2 is "H", the NOR gate Q5 is activated in circuit C. Since the output becomes "L", the NPN transistor Q is turned off, and the relay RY is not conductive, combustion is turned off. Furthermore, if the room temperature rises to 184 or more, then drops to upper 2 (RT2 is "day") and enters weak operation, and then rises again to t3, RT2 becomes "H",
Since RT3 is "L" and B is "L", the output of the above-mentioned /Agate Q is "L", and relay RY is no longer conductive, resulting in combustion off operation. As described above, the present invention
Although the temperature detection circuit shown in FIG. 2 and the operation control circuit shown in FIG. This also includes cases in which a microcomputer is used to control the machine's sequential control circuit, safety control circuit, and operation control circuit to improve the efficiency of peripheral control circuits.

In addition, regarding the switching of the calorific value, it is also possible to add a medium calorific value in addition to high and low to more precisely adjust the room temperature in three stages. As explained above, the present invention has a desired room temperature set value (hereinafter referred to as the center value), a set value slightly higher than this center value (hereinafter referred to as the upper limit value), and a slightly lower temperature set value (hereinafter referred to as the lower limit value). When the room temperature has not reached this upper limit, hunting combustion operation is performed with a strong calorific value and a weak calorific value with the set width of the central value as the boundary,
When the room temperature reaches the upper limit, hunting combustion operation with weak calorific value and zero calorific value is performed at the above center value even if the room temperature decreases a little, and even once the room temperature reaches the upper limit, the hunting combustion operation continues at the lower limit. When the room temperature drops to the above value, the hunting combustion operation with a weak calorific value and zero calorific value is canceled, and from then on, the hunting combustion operation with a strong calorific value and a weak calorific value is performed at the above-mentioned center value to lower the room temperature. Because the temperature is controlled, even if the temperature load state of the room to be heated changes rapidly, it is no longer necessary to manually adjust the room thermo setting, that is, the setting range of the thermo volume, each time the room temperature suddenly changes. The operating state can be automatically and quickly switched between high calorific value, weak calorific value, and zero calorific value in response to changes in room temperature, further promoting fuel efficiency and automatically keeping the room temperature at the desired constant temperature. It can be controlled in a controlled manner.

[Brief explanation of the drawing]

Fig. 1 is a diagram of changes in room temperature, Fig. 2 is a temperature detection circuit, Fig. 3 is a diagram of output signal transition of the overflow detection circuit, and Fig. 4 is an operation control circuit, where T is the room temperature setting value ( heat t3 is the setting width of the room temperature setting value, t4 is the upper limit value, and the heat lower limit value. Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] 1 having a desired room temperature set value (hereinafter referred to as the center value), a temperature set value slightly higher than this central value (hereinafter referred to as the upper limit value), and a slightly lower temperature set value (hereinafter referred to as the lower limit value),
When the room temperature does not reach this upper limit, hunting combustion operation with strong and weak calorific values is performed using the set width of the center value as the boundary, and when the room temperature reaches the upper limit, the room temperature will decrease slightly from then on. Even if hunting combustion operation with a weak calorific value and zero calorific value is performed at the above-mentioned center value, and once the room temperature reaches the upper limit value, if the room temperature subsequently decreases to the lower limit value, the weak calorific value and zero calorific value A room temperature control method for a hot-air heater, characterized in that the hunting combustion operation is canceled and the room temperature is thereafter controlled by performing a hunting combustion operation with a strong calorific value and a weak calorific value at the above-mentioned center value. .