JPS61213418A - Fan heater - Google Patents

Abstract

PURPOSE:To provide a fan heater which is of simple construction, easy to operate and comfortable by correcting the burning starting set temperature TON after suspending the burning by the maximum value of the detected temperature at the room temperature detecting element exceeding the burning suspension set temperature TOFF. CONSTITUTION:When the detected temperature at the room temperature detecting element 4 exceeds TOFF and the burning is suspended, the blower fan 3 is stopped, and the overshoot at the moment of the peak of the detected temperature at the room temperature detecting element 4 on account of the radiation heat and convective heat from the outer casing 5 by the heat accumulated in the appliance is written in a control circuit. The burning start temperature set temperature TON is corrected by the overshoot temperature. In this manner, when the room temperature gets lowered, the burning can be started at the room temperature at which one does not feel cold, realizing a very confortable temperature control over an entire heating season of fall-winter- spring.

Description

[Detailed description of the invention] Industrial applications The present invention relates to room temperature control of a hot air heater.

BACKGROUND OF THE INVENTION In general, the set value of a hot air heater is as shown in FIG. ) The structure is set so that the average value of the temperature control during combustion is stabilized.

Problems to be Solved by the Invention Figure 4 shows a configuration diagram of a hot air heater. 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 of a hot air heater, 6 is an air filter, A, 8 is a flow of indoor air on the suction side, 9 is a discharge It is the flow of air.

In the above configuration, when the room temperature is set to a predetermined temperature using the room temperature setting section (not shown), the temperature detected by the room temperature detection element 4 is
A temperature control circuit (not shown) controls the combustion amount of the burner 1 and the air volume of the blower 77 so as to reach the set temperature. When the outside temperature is low, the appliance operates with the Mi-Lo output, and in this case, the air blower 71 and 3 continue to rotate, so the room temperature detection element 4
is in the flow of indoor air intake 7 and 8, and it is possible to detect a temperature almost equal to the room temperature, but in late autumn and early spring, when the outside temperature is high, it is shown in Figure 5. As shown, Hi-Lo-OFF control is performed.

When stopped, the air blower 71-3 stops, and as shown in Figure 5,
The room temperature detection element 4, which had been in the indoor air flow until then,
Radiant heat from the exterior case 6 due to the amount of heat accumulated in the hot air heater and convection heat overshoot, resulting in the temperature detected by the room temperature detection element "TH" and the actual room temperature felt as a bodily sensation "R".
When the trajectory of the OOM shifts and the room temperature drops and TTH reaches the combustion start set value TON, the temperature of the ROOM becomes even lower, resulting in a chilly sensation and an inconvenient hot air flow. There is a heating machine.

The present invention solves these conventional problems and provides a warm air heater that has a simple configuration, is easy to use, and is comfortable.

Means for Solving the Problems The hot air heater of the present invention has a temperature detected by a room temperature detection element "TH".
If the overshoot still occurs even after reaching the combustion stop set value "OFF", the maximum value TA of the overshoot is determined and a temperature kTA proportional to TA is added to the combustion start set value TON.

Function: The hot air heater of the present invention detects the temperature "TH" detected by the room temperature detection element.
By determining the overshoot temperature TA after reaching the combustion stop set value ``OFF'' and adding the temperature kTA proportional to TA to the combustion start set value TON, the combustion stop set value ``OFF'' and the combustion start setting can be adjusted. It is possible to reduce the temperature differential of the value TON, and as a result,
When combustion stops and the room temperature drops, it is possible to restart combustion at a room temperature that does not feel chilly.

Example An embodiment of the present invention will be described below with reference to FIGS. 1 to 4.

In FIG. 1, the upper diagram shows the heating output state, and the lower diagram shows the room temperature control state with the vertical axis as a temperature scale, the position of each set temperature, and the horizontal axis as a time scale.

If the interior air temperature is low, such as below OC, the appliance repeats the heating output Hi-Lo and the blower fan 3 continues to rotate, so the room temperature detection element detects a temperature that is almost the same as the room temperature.
Temperature control is performed faithfully to the set value (not shown). Next, when the outside temperature is high such as 6℃ to 10℃, the heating output L
Since the room temperature rises even at O, the appliance stops combustion (OFF) when the temperature detected by the room temperature detection element 4 exceeds TOF. After that, the blower fan 3 stops, and the amount of heat accumulated in the appliance is removed from the outer case 5. The temperature detected by the room temperature detection element 4 due to radiant heat and convection heat follows the trajectory shown in FIG.
The overshoot TaC when TH reaches its peak is read into the control circuit (Fig. 2). As a proportional constant, calculate Tβ-kTa and TON"TON"β in the control circuit,
The combustion start set value TON is corrected by τβ. As a result, due to the combustion stop, the room temperature decreases and the detected temperature TTH of the room temperature detection element 4 changes to the corrected combustion start point T ON -T
When ON + T B is reached, the appliance begins to burn. At this time, the temperature TR00M that can be felt is approximately 73
Although it is below ℃, the temperature is almost equal to the original combustion start set temperature TON, and the temperature control is equivalent to being faithfully executed according to the original set values ``OFF'', ``L'', and TH. . FIG. 2 shows an example of a control circuit. The room temperature is set using K from the K e y signal generator 11.
The ey signal is read as the key input of the microcomputer 1o, and the microcomputer 1o outputs a 4-bit LED output control signal to D4 to D7 to display the display circuit 1.
2 to display the set temperature.

At the same time, inside the microcomputer 10, the set values "OFF,""TON,""L," and "H" shown in FIG. 1 are set and stored as calculation results.

The room temperature is determined by the microcomputer 10 by converting the resistance change of the room temperature detection element TH4 into a potential, and sequentially comparing the 6-bit ladder output composed of the microcomputer 10 and the D/A converter 13 with the comparator 14. It is input to the Th terminal.

The Svo and Sv1 pins of the microcomputer 10 are outputs to the solenoid valve drive circuit 15, and are controlled by the microcomputer 10 based on the relationship between the room temperature and the set temperature.
o sV during combustion, SV when OFF L,, H1 combustion
o, SV, both KON, combustion! The hour is sVl.

Sv, both are configured to be turned off.

FIG. 3 explains the above control procedure using a flowchart.

Effects of the invention As described above, the set combustion start temperature TON is set to T ON =
By setting T ON + k Ta, the detected temperature TTH of the room temperature detection element 4 after combustion stop becomes the combustion stop set value TO
Even if it overshoots from FF, it is possible to correct the combustion start set value TON based on the overshoot temperature, and when the room temperature drops, combustion can be restarted at a room temperature that does not feel chilly. This makes it possible to achieve extremely comfortable temperature control throughout the entire heating season from fall to winter to spring.

[Brief explanation of drawings]

FIG. 1 is a diagram illustrating temperature control in an embodiment of the hot air heater of the present invention, FIG. 2 is a diagram illustrating a part of the control circuit of the hot air heater, and FIG. Flow of control procedure of temperature control circuit of hot air heater 0 3...Blower fan, 4...Room temperature detection element, 10...Microcomputer. Figure 1 QM - Figure 2 W & Figure 3!・-Heath Δ, 1. Hall detection element Figure 4 5. Outside cum...filter 7, n-dau 3am! ! Tai - Shiromoto l...Coughing and coughing Imperial rice n flow table 9...υUeyama jl Qi 77 meshire Figure 5 Figure 6

Claims (1)

[Claims] By comparing the set temperature and room temperature, the heating output of the equipment is controlled from combustion stop to full output, and after combustion stop, the combustion stop set value T is
A hot air heater comprising means for correcting a combustion start set value T_O_N based on a maximum value of a temperature detected by a room temperature detection element exceeding _O_F_F.