JPS6132301Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a combustion device used in a heater or the like, and relates to a control circuit provided with a saving switch that digitally switches the combustion state.

Recently, there has been a strong call for saving energy in various fields, and this is also a global issue.
Among the many energy saving measures,
Regarding heating, there is a strong demand for saving heating temperature settings. That is, the heating temperature is set low. For this purpose, it is a good idea to use a heater with an automatic room temperature control device (hereinafter referred to as a room thermostat) to automatically control the room temperature and save wasted energy.

Here, conventional room thermos have a temperature setting device that changes the set temperature in an analog way.
This sets the indoor temperature to a certain value.
Further, this temperature setting device is provided with "high-medium-low" indications corresponding to the setting knobs. However, this setting scale is rough enough to set the heating temperature to approximately this level, and it is difficult to finely adjust the heating temperature using this setting knob, causing trouble to the user. In other words, although it is said to be energy saving, simply setting the heating temperature to ``low'' regardless of the room temperature may be used with the rough setting described above, but this does not fully function as a heater. do not have. Therefore, in order to obtain the desired heating effect for room temperature with the minimum amount of energy, it is desirable to be able to precisely and easily adjust the set temperature.

For example, even in a general house, when considering the heating temperature, each room has a comfortable room temperature. In the living room
20-22℃, 18-20℃ in the dining room, 13-15℃ in the bedroom
That's how it turned out. Although each room may be equipped with a heater, it is not unusual for a room to be shared, such as a living room and dining room, or a living room and bedroom, or for two rooms to be connected. In this case, it would be convenient if the temperature setting of the same heater could be precisely and easily changed depending on the purpose of the room and the time, which would lead to savings. In addition, even in the same room, when starting the operation or when there is a large temperature difference between the outside air in the morning and evening, the heating setting is set high, but during the day or when it is slightly warm, such as in early autumn or early spring, the setting is set lower. It saves energy. Therefore, for this reason as well, it is desirable that the settings can be easily switched, and it is also desirable that a wide setting range can be obtained with great precision.

The purpose of this invention is to provide a new saving switch in addition to the normal room temperature setting using the room thermo knob, and by turning on the switch, the heating temperature can be lowered by a certain range (for example, 3 degrees Celsius).
To provide a combustion device that facilitates easy-to-use, economical heating by making it possible to easily set room temperature in a detailed and wide range, and that helps save energy.

The present invention will be described below with reference to an embodiment shown in the drawings. Figure 1 shows the operation panel of the heater. In the figure, reference numeral 11 denotes a switch for operating and stopping operations, and when this operation is performed, a control circuit (not shown) operates to operate and stop the heater in a predetermined sequence. Reference numeral 12 denotes a heat power adjustment knob, which is used for manual operation without room thermostats, and is used to adjust the heat power (heat amount) of the heater. 13 is a room thermo knob, which is used to set the room temperature during automatic operation. 14
is an operation indicator lamp that lights up when the heater is operating.
Reference numeral 15 denotes a saving switch, and by turning it on, the temperature is set lower than the setting value of the room thermo knob 13 by a certain range (for example, 3° C.). Reference numeral 16 denotes a heating saving display lamp, which is turned on when the saving switch 15 is turned on.

Next, the control circuit will be explained with reference to FIG. In the figure, T is a transformer, whose primary side is an AC power supply.
It is connected to AC, and the secondary side is connected to lines P and N via a full-wave rectifier circuit R _f and a smoothing filter C, and DC power is supplied here. ZD is a Zener diode that maintains a constant voltage between the lines P and N and between R ₁ and N. Reference numeral 17 denotes a resistor bridge circuit for detecting room temperature, which is composed of resistors R ₁ , R ₂ , R _H , and R _V and is connected between lines P ₁ and N. Here, as the resistor R _H constituting one side, a temperature sensing element whose resistance value changes according to temperature changes, such as a thermistor, is used.
Further, as the resistor R _V , a temperature setting device whose resistance value can be changed in an analog manner is used, and the room thermo knob 13 is connected to this. Furthermore, R ₂ of the fixed resistor is divided into R _2a and R _2b , and one part R _2b is connected to the saving switch 1 in order to short-circuit it.
5 contacts 15-1 are provided in parallel. The other contact 15-2 of the saving switch 15 is connected in series with the saving heating indicator lamp 16.

Reference numeral 19 is an output device that generates a combustion state switching command according to room temperature changes, and a comparator 20 using an IC.
, a transistor T _r that turns on and off in response to its output, and a control relay R _L that is excited by its collector current. Comparator 20
connects its (+) side input terminal to the resistor bridge circuit 17
The (-) _side input terminal is connected to the other bridge point of the same bridge circuit 17. Furthermore, the output side is connected to the base of the transistor T _r via the illustrated diode and resistor. Then, in response to the voltage difference between the bridge points of the resistive bridge circuit 17, the output is inverted when this potential difference reaches zero, and the transistor is controlled to turn on and off.
Also, the control relay R _L is connected between the lines P and N via this transistor T _r , and the transistor T
It is excited when _r is turned on. This control relay R _L has two switching contacts R _L -1 and R _L -2 for switching the combustion state. Contact R _L -1 switches the operating speed of the convection fan motor FM that generates hot air, and the normally closed terminal L switches the operating speed of the convection fan motor FM that generates hot air.
The normally open terminal H, which is connected to the low speed terminal of the fan motor FM and is closed by excitation, is connected to the high speed terminal of the same fan motor FM. Further, the normally closed side terminal L of the contact R _L -2 is connected to the first fuel valve V _L , and the normally open side terminal H is connected to the second fuel valve V _H. Here, the supply amount of both fuel valves V _L and V _H satisfies V _L <V _H.

Next, the action will be explained. When the saving switch 15 is turned off, the control is similar to conventional room thermostat control. That is, the fixed resistance values of the resistance bridge circuit 17 are set as R ₁ Ω, R _2a Ω, and R _2b Ω, the resistance value of the temperature setting device set by the room thermo knob 13 is set as R V Ω, and the resistance value of the temperature sensing element is set as R _V Ω. The resistance value is R _H
When Ω is assumed, the following relationship holds: R _H =R ₁ /R _2a +R _2b ·R _V (1), and when the potential difference between the bridge points becomes zero, the comparator 20 inverts the output signal. Therefore, when R _H > R ₁ /R _2a +R _2b ·R _V , that is, when the room temperature is lower than the set value, if the output signal of the comparator 20 is configured to be (+), the transistor TR turns on, Control relay R _L is energized and contacts R _L -1 and R _L -2 are switched to terminal H. For this reason, the fuel valve V _H with a large supply amount is excited to strengthen the combustion force, and the fan motor FM is rotated at high speed to increase the amount of hot air. Further, when the room temperature rises and the resistance value R _H of the temperature sensing element decreases, and the above equation (1) is satisfied, the output signal of the comparator 20 is inverted, turning off the transistor T _r and demagnetizing the control relay R _L. .
Therefore, the contacts R _L -1 and R _L -2 return to the terminal L side, and fuel is supplied by the low flow rate fuel valve V _L to achieve low heating power, and the fan motor FM is operated at low speed.

Next, when the saving switch 15 is turned on, the resistance R
Since both ends of _2b are shorted, the relationship in equation (1) above becomes (2)
It becomes like the formula.

R _H ′=R ₁ /R _2a・R _V ...(2) From this equation, when the output of the comparator 20 is inverted, the low resistance value R _H ′ of the temperature sensing element is equal to R _H in equation (1). R _H ′>R _H. In other words, the temperature sensing element has a large resistance value when the room temperature is low, and the low resistance value decreases as the room temperature rises, so the relationship R _H ′>R _H means that the control relay R This means demagnetizing _L and switching to a weak operating state.

By selecting an appropriate value for the resistor _R2b and shorting and opening both ends, the room temperature setpoint, which is analogously set by the room thermo knob, can be digitally lowered by a certain range. Since it can be returned to its original state or selected arbitrarily, the room temperature can be set finely and over a wide range, and the operation is easy.

As described above, the present invention provides the following effects.

(1) Room temperature can be set to save when heating. For example, by operating the heating room temperature saving switch 15, you can save 3 degrees Celsius from 23 degrees Celsius and set it lower. In the case of a wooden house in the Tokyo area, the room temperature will be reduced to 23 degrees Celsius when the outside air is 5 degrees Celsius.
The standard heating load when heating at ℃ is 350Kcal/hour x tatami, so in an 8 tatami Japanese-style room, the heating load is 350Kcal/hour x 8 tatami mats.
×23-20/23≒365Kcal/hour save calories. The savings rate is 365/350 x 8 x 100 ≒ 13 (%), which means that you can save approximately 13 (%).

(2) The saving switch is easy to operate, and the saving range it provides is constant, so that in combination with the room thermo knob, fine adjustments can be made to the settings. Even with the room thermo knob alone, it is possible to achieve a certain degree of fine adjustment by moving the knob as if making fine adjustments each time the setting is made, but the operation is cumbersome, and it is uncertain how much savings have been achieved. In contrast, with this device, all that is required is to simply turn the saving switch on, so that even a child can operate it, it is easy to use, and economical operation is ensured. Therefore, the settings can be adjusted with careful consideration given to various conditions, and the savings are great.

(3) Settings using the room thermo knob have selectivity for "high-medium-low" as before.
Since the saving setting lowers the temperature within a certain range relative to the set value, the setting operation is not uniform, but can be applied over a wide range, and is easily accepted by users.

(4) Simple structure, inexpensive construction, and savings.
Since it can be used for PR, it has a great effect.

[Brief explanation of drawings]

FIG. 1 is a front view showing an operation panel of an embodiment of a combustion apparatus according to the present invention, and FIG. 2 is a circuit diagram showing a control circuit used in the present invention. 15... Saving switch, 17... Resistance bridge circuit, 19... Output device, R _H ... Temperature sensing element, R _V
...Temperature setting device, R _2a , R _2b ...Resistor.

Claims (1)

[Scope of utility model registration request] A resistance bridge circuit with a temperature sensing element on one side,
The resistor bridge circuit is equipped with an output device that inputs the potential difference between the bridge points of the resistor bridge circuit and inverts the output when the potential difference becomes zero to control the switching of the combustion state. A combustion device characterized in that it uses a temperature setting device that changes the temperature, and is equipped with a digital temperature saving switch on the other side that shorts out a part of the resistor.