JPH0625798Y2 - Room temperature controller - Google Patents

Description

TECHNICAL FIELD The present invention relates to a room temperature control device used in a hot air heater.

2. Description of the Related Art In a conventional room temperature control device for a warm air heater, the combustion amount is set in multiple steps from the minimum to the maximum, and when the room temperature is lower than the set temperature, the combustion amount is increased and vice versa. When the room temperature was higher than the set temperature, the control device reduced the amount of combustion.

Problems to be solved by the invention Control method using the conventional control device described above, that is, the combustion amount is controlled according to the temperature detected by the room temperature sensor, and the combustion operation is turned on / off even when the room temperature reaches the set temperature. If a so-called proportional control type control method is adopted, the combustion amount is reduced and the generated heat amount decreases as the room temperature detected by the temperature sensor approaches the set temperature (heating target temperature). There is no problem if the required amount of heat for heating is low, but when the heat load from the warm air heater is large, that is, the room is large or the outside air temperature is low and the amount of heat for heating is still large. If necessary, it may be difficult to raise the room temperature to the set temperature. There was a problem.

Further, as described above, since the combustion amount is gradually reduced as the room temperature approaches the set temperature, the rise of the room temperature becomes gradual, and the comfortable heating state cannot be obtained immediately.

On the contrary, when the heat load is small when viewed from the warm air heater, that is, when the room is small or the outside air temperature is high and the calorific value of combustion exceeds the heat quantity required for heating, ON / OFF control is not performed. Moreover, there is a problem that the room temperature does not stabilize at the set temperature, but stabilizes or changes at a temperature higher than the set temperature.

Means for Solving Problems The present invention has been made to solve the above problems.
A switch that sets the target room temperature for heating, an electromagnetic pump that sends fuel oil to the burner, a thermistor that detects the room temperature, and the room temperature detected by the thermistor when the heating operation starts is below the set room temperature set by the setting switch. In some cases, the electromagnetic pump is driven and controlled so that the maximum level of combustion is performed until the room temperature detected by the thermistor reaches a predetermined temperature value obtained by adding a predetermined temperature difference to the set room temperature, and thereafter. Each time the thermistor detects a plurality of predetermined temperature values that are higher than a predetermined temperature value, it controls the drive of the electromagnetic pump so that the combustion level is sequentially reduced to a predetermined level, and at each temperature value above the set room temperature. In the drive control process other than the drive control at the maximum combustion level of the drive control performed in the When a constant room temperature is detected, the electromagnetic pump is driven and controlled so that the combustion level increases to the level at which the drive is controlled, and as a result of combustion at the increased level, the room temperature detected by the thermistor reaches a predetermined temperature value. When it is restored, the electromagnetic pump is driven and controlled so that the combustion level is reduced to the level before the increase, and thereafter, the combustion level is sequentially reduced to the predetermined level each time the thermistor continuously detects a plurality of successively higher predetermined temperature values. In addition to the drive control of the electromagnetic pump, in the process of other drive control except the drive control at the maximum combustion level and the subsequent low combustion level of the drive control performed at each of multiple temperature values higher than the set room temperature. When the thermistor detects not only the set room temperature but also a specified temperature value after subtracting the specified temperature difference from the set room temperature, When the thermistor detects the set room temperature, it not only drives and controls the electromagnetic pump so that the combustion level increases to the level at the time of the drive control immediately before that, but it also sequentially lowers the specified temperature values. Each time the thermistor detects, the electromagnetic pump is driven and controlled so as to sequentially increase the combustion level, and the room temperature detected by the thermistor as a result of the increased level of combustion is sequentially restored to the temperature value that has just passed, so that When the temperature rises above the set room temperature, the electromagnetic pump is driven and controlled so that the combustion level drops to the immediately preceding level, and combustion is performed each time the thermistor detects a plurality of successively higher specified temperature values left after that. A room temperature control device for a warm air heater is configured with a microcomputer that controls the drive of an electromagnetic pump so as to sequentially reduce the level.

The present invention has the above-described configuration, and therefore, when the room temperature detected by the thermistor at the start of heating operation is equal to or lower than the set room temperature set by the setting switch, the room temperature detected by the thermistor is set to a predetermined room temperature. The electromagnetic pump is drive-controlled so as to execute the maximum level of combustion until a predetermined temperature value obtained by adding the temperature difference of 1 is reached.

Thereafter, each time the thermistor detects a plurality of predetermined temperature values sequentially higher than the predetermined temperature value, the electromagnetic pump is drive-controlled so as to sequentially reduce the combustion level to the predetermined level.

In addition, among the drive controls that are performed for each of multiple temperature values above the set room temperature, there is a decrease in the room temperature in the process of other drive controls except the drive control at the maximum combustion level, and the thermistor detects the set room temperature. In this case, the electromagnetic pump is drive-controlled so that the combustion level increases to the level immediately before the drive control, and when the room temperature detected by the thermistor as a result of combustion of the increased level is restored to a predetermined temperature value, The electromagnetic pump is driven and controlled so that the combustion level decreases to the level before the increase, and thereafter the electromagnetic pump sequentially decreases the combustion level to a predetermined level each time the thermistor continuously detects a plurality of predetermined high temperature values. Drive controlled.

If, as a result of the increased level of combustion, the room temperature returns to the predetermined temperature value and then falls again to the set room temperature, the combustion level is increased again to the immediately preceding combustion amount. Aim to recover the above predetermined temperature value. If the heat load (-) of the heating space determined by the relationship with the outside air temperature and the heater heat output (+) are balanced, the drive control just described is repeated, and the room temperature is set to the set room temperature or higher. It will be stable between temperature values.

In addition, among the drive controls that are performed for each temperature value higher than the set room temperature, the thermistor sets the room temperature in the process of other drive controls except the drive control at the maximum combustion level and the subsequent lower combustion level. If not only the temperature is detected, but also a predetermined temperature value after subtracting a predetermined temperature difference from the set room temperature is detected, the combustion level increases to the level during the drive control immediately before that when the thermistor detects the set room temperature. The electromagnetic pump is drive-controlled so that Not only that, each time the thermistor detects a plurality of predetermined temperature values that are successively lower than the predetermined temperature value, the electromagnetic pump is drive-controlled to sequentially increase the combustion level, and the increased levels are increased. As a result of combustion, the room temperature detected by the thermistor is sequentially restored to the temperature value that was passed immediately before, and when it is restored to a predetermined temperature value that is higher than the set room temperature, the electromagnetic pump is driven so that the combustion level drops to the previous level. The electromagnetic pump is driven and controlled so that the combustion level is sequentially reduced each time the thermistor detects a plurality of successively higher predetermined temperature values that are controlled, and room temperature control is performed.

In this case, too, if the room temperature drops to the set room temperature again after the room temperature is restored to the predetermined temperature value higher than the set room temperature as a result of the increased level of combustion, the combustion level is set to the previous value again. The amount of combustion is increased to aim to recover the above predetermined temperature value. If this balances the heat load (-) of the heating space determined by the relationship with the outside air temperature and the heater heat output (+), the drive control just described is repeated, and the room temperature is the set room temperature and It will be stable between high predetermined temperature values.

However, if the temperature does not rise above the specified temperature value, the temperature decreases again to the set temperature, and then to the specified temperature value lower than the set temperature, those temperature values are detected. The amount of combustion is increased each time, aiming to recover to a predetermined temperature value higher than the set temperature. If a certain temperature value higher than the set temperature value is recovered by any of the increased levels of combustion while this control is executed,
After that point, the combustion level decreases. Even if the room temperature falls to the set room temperature again as a result of the operation by that level of combustion, if the combustion level is restored to a predetermined temperature value higher than the set room temperature, that is the heat load of the heating space. Since the (-) and the heater heat output (+) are in a balanced state, the microcomputer executes control for maintaining this state.

Example Hereinafter, this example will be described with reference to the drawings.

In FIG. 1, 1 is a commercial power source, 2-4 are relays,
5 and 6 are resistors, 7 is a hot air fan motor, 8 is a transformer,
Reference numeral 9 is a resistor, and 10 is a Zener diode. Reference numeral 11 is a thermistor that detects room temperature, 12 is a resistor, and 13 is an A / D converter that converts the output voltage (analog amount) of the thermistor 11 and the resistor 12 into a digital amount. Reference numeral 14 is a microcomputer, 15 and 16 are operating / stop switches, 17 and 18 are raising / lowering switches of the set room temperature, and 19 is a display for dynamically displaying the operating state, the set room temperature, and the present room temperature. Reference numeral 20 is a resistor, and 21 is a photocoupler for transmitting a signal for driving the electromagnetic pump 24 shown in FIG. Two
Reference numerals 2 and 23 are coils for switching the relays 2 and 3.

Next, the electromagnetic pump drive circuit of FIG. 2 will be described.

Reference numeral 25 denotes a commercial power source, which serves as a DC power source for driving the electromagnetic pump 24 via the diode 26, the resistor 27, and the capacitor 28. It is stabilized by the Zener diode 30 via the resistor 29. Resistor 31, photo coupler 2
SC through the photo transistor 21-1 of 1 and the resistor 32
It is connected to the gate of R33. SCR33, capacitors 34, 35, resistors 36, 37, 38, 39, SCR4
The one-shot multi W is constituted by 0, the diac 41, and the diode 42.

The operation of the embodiment of the present invention thus constructed will be described below.

When the microcomputer 14 is turned on and the operation switch 15 is pressed, the microcomputer 14 accepts and starts the operation. Then, the operation of the display device 19 and the "set temperature" and "current temperature" are displayed. Here, the raising switch 17 and the lowering switch 1
Press 8 to set the target temperature for heating and make the microcomputer 14 read it. The digitized value of the current temperature by the thermistor 11, the resistor 12, and the A / D converter 13 is read by the microcomputer 14, and the microcomputer 14 drives the display tube 19 to display. Then, the microcomputer 14 outputs a pulse having a certain frequency and turns on the photocoupler 21 in a pulsed manner.

Then, the transistor 21-1 of the photocoupler 21 is turned on in a pulsed manner. Therefore, since a pulse enters the gate of the SCR 33, the One Shot Multi W is turned on with a pulse longer than the signal pulse. Therefore, a pulse current having a pulse width wider than that of the signal pulse and the same frequency as that of the signal pulse flows in the electromagnetic pump 24, and the electromagnetic pump 24 is drive-controlled, so that oil is sent toward the burner (not shown). Then, the combustion is started. Here, the frequency is almost proportional to the amount of oil fed. That is, the combustion amount and the frequency are proportional.

Next, the function of the microcomputer 14 will be described with reference to the temperature pattern diagrams of FIGS.

The scale on the vertical axis in FIGS. 3 to 6 indicates not only the set room temperature Tset set by the setting switch 17 or 18, but also a predetermined temperature difference (set to this set room temperature Tset as a temperature range higher than the set room temperature Tset). In the example, 0.25 ° C.) is added to the temperature value (Tset + 0.25 ° C.) and a plurality of predetermined temperature values sequentially higher than the temperature value by 0.25 ° C.
While calibrating up to set + 1.75 ° C, on the contrary, as a temperature range lower than the set room temperature Tset, a predetermined temperature value (Tset-0.25 ° C) obtained by subtracting a predetermined temperature difference (0.25 ° C in this example) from the set room temperature Tset. And that temperature value sequentially
A plurality of predetermined temperature values lower by 0.25 ° C are calibrated up to Tset-1.5 ° C.

In addition, the controlled combustion amount is a level divided into eight levels from the maximum to the minimum here, and the higher the value, the higher the combustion level.

Now, it is assumed that the set room temperature Tset is set by the setting switch 17 or 18 and the start of the heating operation is instructed. At the same time, assume that the room temperature detected by the thermistor 11 is equal to or lower than the set room temperature Tset.

In that case, when the room temperature detected by the thermistor at the start of heating operation is equal to or lower than the set room temperature set by the setting switch, the electromagnetic pump 24 adds a predetermined temperature difference to the room temperature detected by the thermistor. Drive control is performed according to the process of performing drive control so as to perform combustion at the maximum level until a predetermined temperature value obtained by the above is obtained. In FIG. 3 to FIG. 6, an upward arrow with a numerical value “8” is set at room temperature Tset +
The fact that it is continuous until it reaches 0.25 ° C indicates that.

Next, the room temperature detected by the thermistor is the set room temperature T.
When the temperature reaches set + 0.25 ° C., the microcomputer 14 drives and controls the electromagnetic pump 24 so that the combustion level drops to “7”. Then, the combustion of the level “7” is continued, and a plurality of temperature values (Ts) sequentially higher than the predetermined temperature value (Tset + 0.25 ° C.) described above.
et + 0.5 ° C, Tset + 0.75 ° C, Tset + 1.0 ° C, ... Tse
The combustion level is set to "6" each time t + 1.75 ° C) is detected,
The electromagnetic pump 24 is controlled so as to be gradually decreased to "5", ...
FIG. 3 shows the state of this control.

In addition to the above, the control by the microcomputer 14 is another process of the drive control except the drive control at the maximum combustion level among the drive controls performed for each of a plurality of temperature values above the set room temperature, that is, for example, in FIG. Room temperature Tset + 1.0 ℃ is thermistor 1
While the combustion of level "4" is detected by 1, the disturbance is generated by opening and closing the doors for the entry and exit of people and the opening and closing of windows for ventilation, etc.
When the temperature detected by is decreased to the set room temperature Tset,
The electromagnetic pump 24 is drive-controlled so that the combustion level increases to the level at the time of the drive control immediately before that, so that the combustion level becomes the previous level "5" when the detected room temperature becomes Tset. Then, the electromagnetic pump 24 is controlled. FIG. 4 shows the state of this processing. As can be seen from this, the execution of the combustion amount increased to the level “5” raises the room temperature without decreasing thereafter, and Tset +
When 0.25 ° C. is recovered, the combustion amount is again reduced to the level “4” before the increase, and the combustion amount at the level “4” will follow the process described in FIG. If no disturbance is applied during that time, the combustion reaches level "1" and stabilizes. FIG. 4 shows how similar control is performed in any case except the case of level "8".

If the room temperature decreases to the set room temperature (Tset) again after the room temperature is restored to the predetermined temperature value (Tset + 0.25 ° C) as a result of the combustion increased to the level "5", The combustion level is again increased to the combustion amount of the immediately preceding level "5", and the recovery is aimed at the above-mentioned predetermined temperature value (Tset + 0.25 ° C). If this balances the heat load (-) of the heating space and the heater heat output (+), which is determined by the relationship with the outside temperature, etc., the drive control described above will be repeated, and the room temperature will be set. It becomes stable between room temperature (Tset) and a predetermined temperature value (Tset + 0.25 ° C.) higher than it.

Further, the control by the microcomputer 14 is other than the drive control at the maximum combustion level "8" and the subsequent lower combustion level "7" among the drive controls performed for each of the plurality of temperature values higher than the set room temperature. In the process of drive control, specifically, for example, when the room temperature Tset + 1.0 ° C. is detected by the thermistor 11 and combustion of level “4” is being performed, a disturbance occurs and the temperature is set only at the set room temperature (Tset). Without Tset
If -0.25 ° C is detected, the electromagnetic pump is driven and controlled so that the combustion level is increased to the level at the time of drive control immediately before when the thermistor detects the set room temperature, and not only that. Further, thereafter, the electromagnetic pump is drive-controlled so as to sequentially increase the combustion level each time the thermistor detects a plurality of predetermined temperature values that are sequentially lower than a predetermined temperature value equal to or lower than the set room temperature (Tset). Control the pump. FIG. 5 shows the state of the control. When the room temperature falls to the set room temperature Tset, the combustion level is increased to "5", and even if the control is performed, the room temperature becomes Tset-0.25 ° C. When it decreases, the level is further increased to "6". If the room temperature rises due to this level "6" combustion and the set room temperature Tset + 0.25 ° C is restored, the combustion amount is reduced to level "5" at that point, and if it goes smoothly, the combustion level "1" is reached. It comes to control and stabilizes. On the other hand, if the decrease in room temperature cannot be stopped by increasing the level to "6", the combustion level is increased each time a predetermined temperature value is detected, and finally the level "8" is reached.
To continue heating operation.

If the room temperature falls to the set room temperature (Tset) again after the room temperature is restored to the predetermined temperature value (Tset + 0.25 ° C) as a result of the increased level of combustion, Again, the combustion level is increased to the immediately preceding combustion amount, aiming at recovery of the above-mentioned predetermined temperature value. If this balances the heat load (-) of the heating space determined by the relationship with the outside air temperature and the heater heat output (+), the drive control just described is repeated, and the room temperature is the set room temperature and It will be stable between high predetermined temperature values.

However, nevertheless, the predetermined temperature value (Tset +
The temperature does not rise above 0.25 ° C and the set temperature (Tse
If the temperature decreases to a predetermined temperature value (Tset-0.25 ° C) lower than the set temperature, the combustion amount is increased each time these temperature values are detected, and the combustion amount is higher than the set temperature. Aim to recover to a specified temperature value (Tset + 0.25 ° C). While this control is being executed, the combustion is carried out at any one of the increased levels (“6”, “7”, “8”), so that the predetermined temperature value (Tset + 0.25) higher than the set temperature value (Tset) is reached.
℃) is restored, the combustion level will decrease further from that point onward, and even if the room temperature falls to the set room temperature again as a result of operation due to that level of combustion, by increasing the combustion level, it will be higher than the set room temperature. When it recovers to the temperature value of, it is considered that the heat load (-) of the heating space and the heat output (+) of the heater are balanced, and the microcomputer performs control to maintain this state. Carry out.

Fig. 5 shows the case where the room temperature falls below the set room temperature Tset-0.25 ° C during the operation process aiming at the combustion level "1" in Fig. 3. Next, Fig. 6 shows the combustion level "1". The figure shows the state of control when a similar room temperature drop occurs in the situation where the temperature reaches the condition. Also in this case, as described with reference to FIG. 5, if the room temperature is restored to the set room temperature Tset + 0.25 ° C. by switching the combustion level, the combustion level is further reduced to the previous level from that point, and the same control is executed. It shows that you do.

Although not described in detail in the above description, it is naturally necessary from the viewpoint of comfortable heating to switch the blowing level of the warm air fan according to the combustion level. Since the present invention adopts a method of switching the combustion level according to the detected room temperature, it is possible to immediately switch the blowing level in accordance with the switching, and the effect is remarkable.

Effect of the Invention According to the present invention, the heating operation at the maximum combustion level is controlled at any time until the predetermined temperature value exceeding the set room temperature is reached at the start of heating, so that the comfortable temperature can be reached quickly. In addition to that, the combustion amount is appropriately controlled according to the detected room temperature, so that the room temperature can be controlled to a comfortable value at all times.

[Brief description of drawings]

FIG. 1 is an electric circuit diagram of an embodiment of the present invention, FIG. 2 is an electromagnetic pump drive circuit diagram thereof, and FIGS. 3 to 6 are examples of temperature pattern diagrams showing the relationship between room temperature and combustion amount switching. is there. 11 ... Thermistor, 14 ... Microcomputer, 24 ... Electromagnetic pump.

Claims (1)

[Scope of utility model registration request] 1. A switch (1) for setting a target room temperature for heating.
7, 18), an electromagnetic pump (24) for sending fuel oil to the burner, a thermistor (11) for detecting the room temperature, and the room temperature detected by the thermistor at the start of heating operation are set by the setting switch. When the room temperature detected by the thermistor is equal to or lower than the set room temperature, the electromagnetic pump is configured to perform maximum level combustion until the room temperature detected reaches a predetermined temperature value obtained by adding a predetermined temperature difference to the set room temperature. Driving control of the electromagnetic pump to reduce the combustion level to a predetermined level each time the thermistor detects a plurality of predetermined temperature values sequentially higher than the predetermined temperature value. Other than the drive control at the maximum combustion level among the drive controls performed for each of multiple temperature values above the set room temperature When the thermistor detects the set room temperature in the process of drive control, the electromagnetic pump is drive-controlled so that the combustion level increases to the level at the time of drive control immediately before, and as a result of combustion of the increased level, When the room temperature detected by the thermistor is restored to the predetermined temperature value, the electromagnetic pump is driven and controlled so that the combustion level is reduced to the level before the increase, and thereafter the thermistor continuously outputs a plurality of successively higher predetermined temperature values. The electromagnetic pump is drive-controlled so as to sequentially reduce the combustion level to a predetermined level each time it is detected, and the maximum combustion level of the drive control performed for each of a plurality of temperature values higher than the set room temperature and the subsequent one. If the thermistor only detects the set room temperature in the process of other drive control except the drive control at the lower combustion level, Further, when a predetermined temperature value obtained by subtracting a predetermined temperature difference from the set room temperature is detected thereafter, first, when the thermistor detects the set room temperature, the combustion level is increased to the level in the drive control immediately before that. Not only the electromagnetic pump is drive-controlled, but also the electromagnetic pump is drive-controlled so as to sequentially increase the combustion level each time the thermistor detects a plurality of predetermined temperature values sequentially lower than the predetermined temperature value, and As a result of the increased level of combustion, the room temperature detected by the thermistor sequentially recovers the temperature values that it has just passed, and when it recovers to the predetermined temperature value higher than the set room temperature, the combustion level becomes the previous level. The electromagnetic pump is driven and controlled to decrease, and the thermistor detects a plurality of successively higher predetermined temperature values remaining thereafter. A room temperature control device comprising a microcomputer (14) for driving and controlling the electromagnetic pump so as to sequentially reduce the combustion level for each.