JPH03195814A - Controller for room heater - Google Patents

Abstract

PURPOSE:To lengthen an operating time, to decrease the frequency of ON-OFF and to reduce the discomfortable feeling of a user by lowering maximum heating capacity and controlling capacity after the return to heating when heating is stopped by the rise of room temperature once. CONSTITUTION:A control means 9 controls the quantity of combustion of a heating apparatus 1 by room temperature detected by a thermistor 8, and a comparison means 10 compares room temperature T detected by the thermistor 8 and an OFF-temperature TOFF set in response to a set temperature. A stopping means 11 stops a pump 2 on T>TOFF, and stops a burner motor 5. An arithmetic means 12 determines the quantity of combustion Q from room temperature T detected on T<TOFF. A capacity control means 13 controls the frequency of the pump 2, controls fuel, controls the number of revolution of the burner motor 5 and controls the quantity of air fed. A changeover section 14 changes over a first arithmetic section 15 and a second arithmetic section 16 so that the first arithmetic section 15 conducts arithmetic operation until T>TOFF holds first and the second arithmetic section 16 performs arithmetic operation after T>TOFF holds. Since the maximum heating capacity of the second arithmetic section 16 is lower than the first arithmetic section 15, the heating apparatus is operated by low heating capacity after the apparatus is stopped once and an operating time is lengthened.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a control device for a heater, and more particularly to capacity control of a variable capacity heater.

Conventional technology As a means of controlling the room temperature of a heater that heats a room, strong twist firing (3,200kcal/h) and weak combustion (L600kcal) are used.
An example of a combustion heating appliance capable of switching between two levels of capacity (al/h) will be described with reference to FIGS. 7 and 8. Heating is started, the room temperature T rises, and strong twist firing is continued until it reaches the user's set temperature T. When T>Ts, switch to weak combustion 0
When the room temperature decreases to T<(T3~2) in a state of weak combustion, the firing is switched to strong twist firing. Further, even in a state of weak combustion, when the room temperature further rises and reaches T> (Ts +-2), combustion is stopped.

When the room temperature drops due to combustion stop and becomes T <('rs-2), combustion is resumed by strong twist firing, and the above cycle is repeated.
The room temperature is T, -2 and T, + with respect to the user's set temperature T,
It is controlled to be almost constant between 2 and 3.

Problems to be Solved by the Invention However, in the above system, after the room temperature rises to a predetermined temperature and heating is stopped, when the room temperature falls to the predetermined temperature and heating is resumed, the operating time with strong combustion heating capacity is limited. However, because the time it takes for the room temperature to rise again to the heating stop temperature is short, the heating system has to be turned on frequently, especially with small heating loads, which causes discomfort to the user.
There was a problem with durability and safety could not be guaranteed if used for a long period of time.

The present invention solves these conventional problems, and aims to reduce the frequency of use of the heating device, reduce user discomfort, and extend the period of use while ensuring safety.

Means for Solving the Problems In order to solve the above problems, the heater control device of the present invention includes a heating device with variable capacity, a room temperature detection means for detecting room temperature, and a room temperature detected by the room temperature detection means to control the heating. The control means has a control means for controlling the heating capacity of the device, and the control means includes a comparison means for comparing the detected room temperature of the room temperature detection means with a predetermined temperature, and a comparison means for comparing the detected room temperature with the predetermined temperature according to a signal from the comparison means. a stopping means for stopping the heating device;
a calculation means for calculating heating capacity from the sensed room temperature when the detected room temperature is lower than a predetermined temperature based on a signal from the comparison means; and a capacity control means for controlling the heating device based on the calculation result of the calculation means, the calculation means A first calculation unit that performs calculations until the stop means is activated for the first time after the heating device starts operating; a second calculation unit that has a lower maximum heating capacity than the first calculation unit; and a second calculation unit that performs calculations when the stop means is activated. The configuration includes a switching section for switching from the first computing section to the second computing section.

According to the above-described configuration, the present invention compares the room temperature detected by the room temperature detection means with the heating stop temperature by the comparison means, and if it is higher, the stop means stops the heating device, and if it is lower, the calculation means calculates the heating capacity and controls the capacity. The means control the ability,
After the start of operation, the first calculation section performs calculations until the room temperature rises and exceeds the heating stop temperature for the first time, and the heating stops.After that, the switching section switches and the second calculation section performs calculations. Since the second computing section has a lower maximum heating capacity than the first computing section, if the second computing section is stopped by -degrees, it will operate at a lower heating capacity and the operating time will be longer.

Embodiments Hereinafter, embodiments of the present invention will be described based on the accompanying drawings. In the embodiment, an oil fan heater that heats the room using kerosene as fuel will be described as an example.

In Fig. 1, 1 is a heating device, which includes a pump 2, a vaporizer heater 3, a vaporizer 4, a burner motor 5, a burner 6, and a convection fan 7.
It consists of: Then, the fuel oil is supplied by the pump 2 to a vaporizer 4 preheated by a heater 3, mixed with air supplied by a burner motor 5, and combusted by a burner 6. The combustion exhaust gas is mixed with air from the convection fan 7 and released into the room to heat the room. 8 is a room temperature detection means that detects the room temperature using a thermistor. Reference numeral 9 denotes a control means that controls the combustion amount of the heating device 1 based on the room temperature detected by the thermistor 8. Reference numeral 10 is a comparison means, which is a cut-off temperature T set according to the room temperature T detected by the thermistor 8 and the temperature set by the user. Compare with FF. 11 is a stop means that stops the pump 2 when T>Toyr. After that, post-purging is performed for a predetermined period of time, and the burner motor 5 is stopped. When T<Torr, the calculation means 12 determines the combustion amount Q from the detected room temperature T. A capacity control means 13 controls the frequency of the pump 2 according to the combustion amount Q to control the fuel, and controls the rotation speed of the burner motor 5 to control the amount of air to be supplied. Reference numeral 14 denotes a switching unit, in which the first calculation unit 15 performs calculations until T > To□ for the first time, and when T > To□, the second calculation unit 16 thereafter performs calculations. be. FIG. 2 shows the relationship between the room temperature T and the combustion amount Q calculated by the first calculation section 15, FIG. 3 shows the relationship between the room temperature T and the combustion amount Q calculated by the second calculation section 16, and FIG. 4 shows the time of the room temperature T. The change and combustion amount Q are shown. When the operation is started and the room temperature T rises, initially, according to the calculation of the first calculation unit 15 in FIG. 2, between T < T tO, Q =
Q.

burns with When it comes to TNT, the combustion amount is lowered and Q =
It burns at Q + (Q I < Q z). Here, when the room temperature falls and becomes T<T, (T, <Tt), combustion occurs as Q=Q. However, even though Q=Q, the room temperature rises and T>T
When it reaches art, combustion is stopped (Q=O).

When the combustion is stopped at T > TOFF, the calculation is switched to the second calculation section shown in Fig. 3, and when the room temperature decreases and T < T, it returns to the combustion amount Q = Q, and Q, = Repeat this cycle with 0 and Q=Q.

In the above explanation, an example has been explained in which the combustion amount is in two stages of Q, , Q, but the same effect can be obtained even in the case of multi-stage or linear combustion. An example of linear combustion will be explained. FIG. 5 shows the relationship between the room temperature T and the combustion amount Q calculated by the first calculation section, and FIG. 6 shows the relationship between the room temperature T and the combustion amount Q calculated by the second calculation section. T>TOFF for the first time after starting operation
It burns until T<T, then Q=Q, and T3<T.
When < T OFF, linear combustion occurs in the range of Q, y > Q > Qi, and when - degree T > T OFF, combustion returns at T < T3 and T < T < CTy < Tt < Torr
) then Q=Q.

(Qz <Qi <Qi), and T4<T<T. ,
.

In this case, linear combustion occurs in the range of Qi > Q > Q3. In this case, fine combustion control can be performed under conditions of a large heating load where T > T OFF does not occur.

The above explanation was given using an oil fan heater as an example.
In addition to heating equipment that uses kerosene, similar effects can be achieved with heating equipment that uses gas or electricity.

Effects of the Invention As described above, according to the heater control device of the present invention, when heating is stopped due to a -degree rise in room temperature, after heating is resumed, capacity control is performed by lowering the maximum heating capacity, so the operating time is reduced. This can reduce the frequency of heating equipment,
This has the effect of reducing user discomfort and extending the period of use while ensuring safety.

[Brief explanation of drawings]

Fig. 1 is a block diagram of a heater control device showing an embodiment of the present invention, Fig. 2 is a diagram showing the relationship between room temperature and combustion amount showing calculations of the first calculation section of the same embodiment, and Fig. 3 is the same. FIG. 4 is a diagram showing the relationship between room temperature and combustion amount showing the calculations of the second calculation section of the embodiment. FIG. 4 is a time chart showing the combustion amount with respect to temporal changes in room temperature in the same embodiment. FIG. FIG. 6 is a diagram showing the relationship between room temperature and combustion amount showing the calculations of the first calculation section of the other embodiment, FIG. 6 is a diagram of the relationship between room temperature and combustion amount showing the calculations of the second calculation section of the same embodiment, and FIG. FIG. 8 is a diagram illustrating the relationship between room temperature and combustion amount showing capacity control in the conventional example. FIG. 8 is a time chart showing the combustion amount with respect to temporal changes in room temperature in the conventional example. DESCRIPTION OF SYMBOLS 1... Heating device, 8... Room temperature detection means, 9... Control means, 10... Comparison means, 11... Stopping means , 12... Calculation means, 13... Capacity control means, 14...
Switching unit, 15...First calculation unit, 16...
-Second calculation section.

Claims (1)

[Claims] It has a heating device with variable capacity, a room temperature detection means for detecting room temperature, and a control means for controlling the heating capacity of the heating device based on the room temperature detected by the room temperature detection means, and the control means is configured to detect the room temperature detected by the room temperature detection means. a comparison means for comparing the detected room temperature with a predetermined temperature; a stop means for stopping the heating device when the detected room temperature is higher than the predetermined temperature according to a signal from the comparison means; and a stop means for stopping the heating device when the detected room temperature is lower than the predetermined temperature according to the signal from the comparison means. a calculation means for calculating heating capacity from the detected room temperature;
capacity control means for controlling the heating device based on the calculation result of the calculation means; A control device for a heater, comprising: a second calculation unit having a lower maximum heating capacity than the calculation unit; and a switching unit that switches calculation from the first calculation unit to the second calculation unit when the stop means is activated.