JPS61190244A - Temperature control device for hot air heater - Google Patents

Abstract

PURPOSE:To provide a temperature control device for a comfortable hot air heater by a method wherein a temperature where an operation of the heater is changed from a low output operation to a high output operation is composed of a temperature where an operation is changed from a high output operation to a low output operation, a temperature where the operation is to be terminated and a temperature where the stopped operation is restarted, respectively, in an order of higher temperature. CONSTITUTION:A system has a burner 1, air blowing fan 3, indoor temperature sensing means 4 and a comparing means. The comparing means sets the temperature in sequence from the higher order, i.e. TOFF, TON, TL and TH where a temperature for terminating the operation is TOFF, a temperature where the terminated operation is restarted at a low output operation is TON, a temperature where a high output operation is changed over to a low output operation is TL, and a temperature where a low output operation is changed over a high output operation is TH. After the temperature is reached to the value of TOFF and the operation is once terminated and the temperature is reached to the value of TON as the room temperature is decreased, the operation is restarted under a low output without fail. Due to this fact, when the room temperature is increased even under a low output operation, it is possible to eliminate irrationality of restarting operation with high output. Due to a repetition of starting of low output and termination, a low fuel consumption can be attained.

Description

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

A- Prior Art A conventional temperature control device for a hot air heater will be explained with reference to the drawings.

FIG. 3 is a configuration diagram of a hot air heater, in which 1 is a burner, 2 is a heat exchanger, 3 is a blower fan, 4 is a room temperature detection element, 5 is an exterior case, and 6 is an air filler. Further, arrows 7 and 8 indicate the flow of indoor air on the suction side, and arrow 9 indicates the flow of discharge air.

FIG. 4 is a block diagram of the temperature control device.

In the above configuration, when a desired room temperature is set in the room temperature setting section, the temperature control circuit controls the combustion amount of the burner 1 and the blower fan so that the temperature detected by the room temperature detection element 4 is maintained near the set temperature. It controls the air volume of 3.

As a method of this control, the temperature at which the stopped operation is restarted is T below c. Temperature at which operation is stopped (hereinafter abbreviated as T), Temperature at which operation is stopped (hereinafter abbreviated as yy), Temperature at which low output operation switches to high output operation (hereinafter abbreviated as TH), Temperature C at which high output operation switches to low output operation. (hereinafter abbreviated as TL)
TOFF I TL I TON I TI
There is also a method of setting I (here T.N=T)I) and adjusting the strength of combustion according to the relationship between the room temperature and the set temperature.
It controls the amount of airflow.

Next, when the outside temperature is low and when it is high will be specifically explained using FIGS. 5 to 7.

When the outside temperature is low, as shown by the curves in the I range in Figures 5 and 6, low output operation cannot maintain the temperature TL, and when the room temperature drops to TH (lower), high output During operation, the room temperature is raised, and when it goes to TL, it returns to low output operation.After that, the operation is repeated in the same manner, and the room temperature is maintained at a constant level.

Next, when the outside temperature is high, as shown by the curves in the ■ range in Figures 5 and 6 (however, the dotted line indicates the areas with both dotted and solid lines), the room temperature will further rise even during low output operation. T. 7. It comes to. and.

Since the operation stops at TOFF, the room temperature decreases. It reaches H. Here, the operation is started again from high output operation and the room temperature is raised. Repeat the same below. However, - when stopping supporting combustion and restarting operation.

Combustion is performed with the fan turned low for a short period of time to stabilize the combustion.

Problems to be Solved by the Invention As shown in the area marked ■ in Figures 5 and 6 and in Figure 7, ToN is set at a temperature between TH and TL or at the same temperature as TH. , the detected temperature reaches Tol, and after stopping combustion, pT due to a decrease in room temperature. When H is reached, the operation is necessarily restarted at high output operation, and when TH is reached, operation becomes low output operation.

Even in low power operation, when the room temperature rises above TH, it would be very unreasonable to restart operation at high power operation, and it would also be a waste of fuel. In addition, during both high-output operation and low-output operation, the blower fan 3 is operated, and as shown in Fig. 2, the room temperature detection element 4 is placed in the flow 7.8 of indoor air intake. , can detect temperatures approximately equal to room temperature.

On the other hand, when the operation is stopped, the blower fan 3 is also stopped, and therefore the indoor air suction flows 7 and 8 are also stopped. As a result, the amount of indoor air was 5.

The room temperature detection element 4, which was in the flow of suction, detects radiant heat from the exterior case 6 due to the amount of heat accumulated in the hot air heater.
As a result of receiving convection heat, the detected temperature (TH) of the room temperature detection element 4 in Figs. A deviation occurs between the solid line and the solid line (as shown by Tα in FIG. 7). Temperature T at which to restart operation. Because H is the temperature detected by the room temperature detection element 4. The detected temperature (TH) is T. The actual room temperature (TR0゜M
) has an even lower temperature as shown by the solid line above (shown by Tβ in FIG. 7). As a result, I sometimes felt a chilly sensation.

This problem can be solved by bringing TON closer to TL, but as mentioned above, since operation is restarted at high output, it creates a problem that switching between high output operation and low output operation becomes complicated. .

SUMMARY OF THE INVENTION An object of the present invention is to provide a comfortable temperature control device for a warm air heater that eliminates the above-mentioned conventional problems.

Page 6 Means for Solving Problems In the hot air control device of the present invention, TH is the temperature at which low output operation switches to high output operation, TL is the temperature at which high output operation switches to low output operation, and the temperature at which operation is stopped. T. A7.
T is the temperature at which the stopped operation is restarted. When H,
"OFF # TON j" in descending order of temperature
Configure as TL I TH.

By configuring as described above, once the operation is stopped, the operation is always restarted with a weak output when the room temperature decreases to TON. For this reason, even in low power operation when the room temperature rises.

The unreasonableness of restarting operation with high output can be avoided. In addition, fuel consumption is reduced because the engine operates at a little less than 1 output and has to be stopped repeatedly.

In addition, after the operation is stopped, the actual room temperature is lower than the detected temperature.
The chilly feeling I was feeling due to the large difference in temperature between warm and cold caused TQFF and T because TON was on the high temperature side compared to TL. N
Because the temperature difference between the two is so narrow, it is hardly felt.

Page 7 Embodiment A temperature control device according to an embodiment of the present invention will be described below with reference to FIGS. 1 to 3 of the drawings.

FIG. 1 is a flowchart for determining the operating state of the temperature control device of this embodiment, in which the set room temperature and the detected temperature of the room temperature detection element 4 shown in FIG. High output operation, low output operation, and operation stop are determined based on the combustion amount and the air volume of the blower fan 3.

Below, the flowchart in Fig. 1 and the operating state diagram in Fig. 2,
This will also be explained using a diagram of room temperature fluctuations.

First, set the desired room temperature, then TOFF # T
ON ITH and TFi are each set, and the detected temperature TH□ and ToN are compared. And TT□
is T. If it is N or more, the operation will not start, but if T□ is T
. If it is less than N, it enters the ignition/combustion state. This state is provided to stabilize combustion, and is operated with a small air volume and large combustion, but it only lasts for a short time, and depending on this state, the room temperature does not rise at all.

When combustion is stabilized, high output operation begins if the detected temperature TTll is lower than TL, and TTH is T5 or higher. F: If the situation is low, start low output operation. Also, TTH is T. If it is F2 or higher, the operation is stopped. Here, high output operation is maintained while TTH is lower than TL.

For low output operation, T when T a □ is above T11. The key below Aa is maintained, and even in low output operation, the room temperature rises and operation is stopped when Tll becomes TOF 7 or more.In low output operation, when the room temperature falls, when TH□ becomes less than TH, the operation is stopped. Back to driving.

TT! I is T. , 2 and once the operation stops.

The room temperature has dropped and TO is higher than TL. Since it is less than yy, low output operation is restarted without entering high output operation.

Region I in FIG. 2 represents the operating state and room temperature fluctuations when the room temperature drops during low output operation.

The temperature range between TH and TL is set to about 0.75°C, and the room temperature is kept almost constant.

The area marked ■ in FIG. 2 represents operating conditions and room temperature fluctuations when the room temperature rises even during low output operation. To□ and T. The temperature range for H is set to approximately 0.76°C, and the room temperature remains almost constant. In addition.

The temperature range of TO, TL is set to about 0.25°C.

With the above configuration, when low-output operation causes the room temperature to drop, switching between high-output operation and low-output operation allows T8
Maintain the temperature within the range of TL and TL, and at high temperatures where the room temperature rises even with low output operation, switch between low output operation and operation stop. 2. and T. Maintain the temperature within the H temperature range.

Therefore, when the room temperature rises even during low output operation, the room temperature can be kept constant by low output operation and operation stoppage, which is very rational and fuel efficient.

In addition, Toyy and T also felt chilly due to the fact that the actual room temperature was lower than the detected temperature due to the stoppage of the blower fan 3 when the operation was stopped. Temperature width with N is 0.75
This problem was solved by making the width as small as ℃. Also, since there is no intervening high-output operation, temperature control is extremely smooth. Note that the room temperature is set by the room temperature setting section.

It was set near TL.

In addition, in the above example, there is a difference in the average temperature maintained at low and high temperatures, but by using a microcomputer etc. as a comparison means, it is possible to determine whether the room temperature increases with low output operation or not. Detected, To, A.

It is easy to shift TON j TL I TH respectively and eliminate the difference in average temperature.

As described in detail, the temperature control device for a hot air heater of the present invention sets each set temperature of TOFF r TON + TL + TII from the high temperature side. FF I TONI TLI
By using TH, when the temperature is high such that the room temperature rises even during low-output operation, low-output operation and operation stop are alternated, which makes it possible to rationally save fuel.

Also, TON is set to a higher temperature side than TL, and Toyy and T. Since the temperature difference with N is reduced, it is possible to eliminate the chilly feeling caused by the fact that the actual room temperature is lower than the detected temperature due to the stoppage of the blower fan when the operation is stopped.

[Brief explanation of the drawing]

FIG. 1 shows a hot air heater 11, - in an embodiment of the present invention.
Figure 2 is a diagram showing its operating status, room temperature fluctuations, and an example of detected temperature fluctuations; Figure 3 is a configuration diagram of the warm air heater; Figure 4 is a diagram showing the temperature control system. The block diagram of the device, FIG. 6, FIG. 6, and FIG. 7 are diagrams showing an example of the operating state, room temperature fluctuation, and detected temperature fluctuation by the conventional temperature control device of a warm air heater. 1...Burner, 3...Blower fan, 4
...Room temperature detection element.

Claims (1)

[Claims] It has a burner, a blower fan, a room temperature detection means, and a comparison means, and the comparison means determines the temperature at which the operation is to be stopped at T_O_F.
＿F, T the temperature to restart the stopped operation at low output operation.
_O_N, the temperature at which the high output operation switches to the low output operation is T_L, and the temperature at which the low output operation switches to the high output operation is T_H, then the above T_O_F_F, T_O_N
, T_L, T_H from the high temperature side T_O_F_F, T_O
_N, T_L, T_H are set in the order, and the temperature detected by the room temperature detection means and the T_O_F_F, T_O_N,
A temperature control device for a hot-air heater that compares T_L and T_H and determines high-output operation or low-output operation based on the combustion amount of the burner and the air volume of the blower fan based on the result of this comparison.