JPH06100372B2 - Hot air heater temperature controller - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a temperature control device for a hot air heater.

2. Description of the Related Art A conventional temperature control device for a hot air heater will be described with reference to the drawings.

FIG. 3 is a configuration diagram of a warm air heater, 1 is a burner, 2 is a heat exchanger, 3 is a blower fan, 4 is a room temperature detecting element, 5 is an outer case, and 6 is an air filter. Further, arrows 7 and 8 show the flow of the indoor air on the suction side, and arrow 9 shows the flow of the discharge air. FIG. 4 is a block diagram of the temperature control device.

In the above configuration, when the desired room temperature is set in the room temperature setting unit, the temperature detected by the room temperature detecting element 4 is maintained near the set temperature by the temperature control circuit by the combustion amount of the burner 1 and the blower fan. The air volume of 3 is controlled.

This control method includes the temperature at which the stopped operation is restarted (hereinafter abbreviated as T _ON ) and the temperature at which the operation is stopped (hereinafter T T
Abbreviated as _OFF), the temperature is switched to a high-output operation from the low power operation (abbreviated as decreased T _H), from the forward high temperatures each temperature of switching to the low power operation from the high power operation (hereinafter abbreviated as T _L) Set to T _OFF , T _L , T _ON , T _H , (where T
There is also a method of setting _ON = T _H ) The strength of combustion and the magnitude of air flow are controlled according to the relationship between room temperature and the set temperature.

Next, a case where the outside air temperature is low and a case where the outside air temperature is high will be specifically described with reference to FIGS.

When the outside air temperature is low, the temperature T _L cannot be maintained in the low output operation as shown by the curves in the range I of FIGS. 5 and 6,
When the room temperature falls to T _H , the high output operation is replaced with the high output operation, and the room temperature is raised to _TL and the low output operation starts again. Repeat the above in the same manner to maintain a substantially constant room temperature.

Next, when the outside air temperature is high, the room temperature rises even in low-power operation as shown by the curves in the range II in FIGS. 5 and 6 (however, the dotted line and the solid line show the dotted line). T _OFF . Then, since the operation stops at T _OFF , the room temperature goes down and reaches T _ON . Here, the operation is restarted from the high output operation to raise the room temperature. Repeat the following in the same way.
However, when stopping one-sided combustion and restarting operation,
For a stable combustion, the fan is weakened for a short time to perform combustion.

Problems to be Solved by the Invention As shown in the area II in FIGS. 5 and 6 and in FIG. 7, T _ON is set to a temperature between T _H and T _L or the same temperature as T _H. Therefore, when the detected temperature reaches T _OFF , the combustion is stopped temporarily, and then T _ON is caused by the decrease in room temperature, the operation is always restarted at the high output operation and the low output operation is reached at the T _L. Become. It was very unreasonable to restart the operation in strong output operation when the room temperature rises above _TL even in weak output operation, and it was a waste of fuel. Further, the blower fan 3 is operated both during the high output operation and the low output operation, and as shown in FIG. 3, the room temperature detecting element 4 is in the intake air flows 7 and 8 of the room air, A temperature equal to room temperature can be detected.

On the other hand, when the operation is stopped, the blower fan 3 is also stopped, so that the suction flows 7 and 8 of the indoor air are also stopped. As a result, the room temperature detecting element 4 that was in the intake air of the room air until then receives the radiant heat and the convective heat from the outer case 5 due to the amount of heat accumulated in the warm air heater, and the temperature is detected in FIGS. As shown by the dotted line representing the detected temperature (T _H ) of the room temperature detecting element 4 in FIG. 7, overshoot occurs, and a deviation occurs from the solid line representing the actual room temperature (T _ROOM ) that is felt as a sensation (Tα in FIG. 7). ). Temperature T to restart operation
_ON is the temperature detected by the room temperature detection element 4. The actual room temperature (T _ROOM ) when the detected temperature (T _H ) becomes T _ON and the operation is restarted is a lower temperature as shown by the solid line (shown by Tβ in FIG. 7). . For this reason, sometimes the user feels chilly.

This problem is solved by bringing T _ON close to T _L , but as described above, the operation is restarted with a strong output, so
This causes a problem that switching between high power operation and low power operation becomes complicated.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a comfortable temperature control device for a warm air heater, which solves the above conventional problems.

Means for Solving the Problems The hot air control device of the present invention has a temperature at which low power operation is switched to high power operation as T _H , a temperature at which high power operation is switched to low power operation is T _L , and a temperature at which operation is stopped. _Where T _{OFF is} the temperature and T _ON is the temperature at which the stopped operation is restarted, T _OFF , T _ON , T _L , and T _H are configured in descending order of temperature.

Action With the above configuration, when T _OFF is reached, the operation is stopped once, and then T _ON is caused by the decrease in room temperature, the operation is always restarted at a weak output. Therefore, it is possible to eliminate the absurdity that the operation is restarted at the high output even when the room temperature rises even in the low output operation. In addition, weak output operation,
The fuel consumption is low because it has to be stopped repeatedly.

Also, after the operation is stopped, the actual room temperature drops below the detected temperature,
The chills that I felt when the difference between warm and cold became large are hardly felt because T _ON is on the higher temperature side than T _L and the temperature difference between T _OFF and T _ON is narrowed.

Embodiment A temperature control device according to an embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

FIG. 1 is a flow chart for determining the operating state of the temperature control device of this embodiment. The set room temperature and the detected temperature of the room temperature detecting element 4 shown in FIG. And the air volume of the blower fan 3 determines the strong output operation, the weak output operation, and the operation stop.

Hereinafter, the flowchart of FIG. 1 and the operation state diagram of FIG.
This will be explained based on the room temperature fluctuation diagram. First, when setting the desired room temperature, T _OFF , T _ON , T _L , T _H are set respectively,
Compare the sensed temperatures T _TH and T _ON . When T _TH is T _ON or more, the operation is not started, but when T _TH is T _ON or less, the ignition / combustion state is entered. This state is provided for stabilizing the combustion, and is operated with a small air flow and large combustion, but it is for a short time, and depending on this state, the room temperature hardly rises. When combustion is stable, high output operation is started if the detected temperature T _TH is lower than T _L , and low output operation is started if T _TH is equal to or higher than T _{L and} lower than T _OFF . If T _TH is greater than T _OFF , stop the operation. Here, high output operation is maintained while T _TH is lower than T _L.

Low power operation is maintained as long as T _TH is higher than T _{H and} lower than T _OFF , and room temperature rises and T _TH
When T is above T _OFF , operation is stopped. In low power operation, when room temperature falls, T _TH goes back to T _H or below and returns to high power operation.

Once T _TH exceeds T _OFF and operation is stopped, the room temperature drops, and since T _ON is between T _{L and} T _OFF , low output operation is restarted without entering high output operation.

A region I in FIG. 2 represents a change in the operating state and the room temperature when the room temperature is lowered in the low output operation. The temperature range of T _H and T _L is set to about 0.75 ° C, and the room temperature is kept almost constant.

The region II in FIG. 2 represents the operating state and the fluctuation of the room temperature when the room temperature rises even in the low power operation. T _OFF and T
_{The ON} temperature range is set to about 0.75 ° C, and the room temperature maintains a substantially constant temperature. The temperature range between T _ON and T _L is set to about 0.25 ° C.

With the above configuration, at low temperature where the room temperature decreases in low output operation, T _H can be changed by switching between high output operation and low output operation.
When the temperature is maintained within the temperature range of T _{L and} the room temperature rises even in low output operation, it is possible to switch between low output operation and operation stop.
Keep within the temperature range of T _OFF and T _ON .

Therefore, when the room temperature rises even in the low output operation, the room temperature can be kept constant by the low output operation and the operation stop, which is very rational and fuel saving.

In addition, the chilliness that I felt due to the fact that the actual room temperature caused by the stop of the blower fan 3 when the operation was stopped fell below the detected temperature, because the temperature range between T _OFF and T _{ON was set} to a small width of 0.75 ° C. It has been resolved. In addition, since the high-power operation is not sandwiched here, the temperature control is extremely smooth. The room temperature set by the room temperature setting unit was set near _TL .

Further, in the above-mentioned embodiment, there is a difference between the average temperature maintained at the time of low temperature and the average temperature maintained at the time of high temperature, but it is possible to detect whether or not the room temperature rises in the low output operation by using the microcomputer etc. Then, it is easy to shift T _OFF , T _ON , T _L , and T _H respectively to eliminate the difference in average temperature.

Effect of the Invention As described above, the temperature control device for a hot air heater according to the present invention is configured so that the set temperatures of T _OFF , T _ON , T _L , and T _H are set to T _OFF , T from the high temperature side.
By setting _ON , T _L and T _H , it is rational and fuel saving can be achieved by repeating the low output operation and the operation stop at high temperature when the room temperature rises even in the low output operation.

Also, since T _ON is set to a temperature higher than T _L and the temperature difference between T _OFF and T _ON is made small, it may be felt that the actual room temperature caused by the stop of the blower fan at the time of operation is lower than the detected temperature. You can also eliminate the chills you used to have.

[Brief description of drawings]

FIG. 1 is an operation flowchart of a temperature control device for a hot air heater according to an embodiment of the present invention, FIG. 2 is a diagram showing an example of its operating state, room temperature fluctuation, and fluctuation of detected temperature, and FIG. Fig. 4 is a block diagram of a temperature control device, Fig. 5, Fig. 6, Fig. 7 and Fig. 7 are operating conditions, room temperature fluctuations, and detected temperatures by a conventional temperature control device for a hot air heater. It is a figure which shows an example of the change of. 1 ... Burner, 3 ... Blower fan, 4 ... Room temperature detection element.

Claims (1)

[Claims] 1. A burner, a blower fan, a room temperature detecting means, and a comparing means, wherein the comparing means sets a temperature at which the operation is stopped to T _OFF and a temperature at which the stopped operation is restarted at a low output operation.
T _ON , temperature at which high power operation is switched to low power operation
T _L , the temperature at which low output operation is switched to high output operation is T _H ,
Wherein T _OFF, T _ON when a, T _L, T _OFF the T _H from the high temperature side,
T _ON , T _L , T _H are set in this order, and the temperature detected by the room temperature detection means and the T _OFF , T _ON , T _L , T _H are compared, and the combustion amount of the burner and the A temperature control device for a warm air heater that determines a high output operation or a low output operation based on the air volume of a blower fan.