JPH0133975Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a combustion control device for a burner used in an instantaneous water heater or isothermal water heater.

In recent years, various operation switches for the combustion operation section of instantaneous water heaters and water heaters have been replaced by non-locking type switches such as push-on switches or touch switches in place of conventional on-off switches due to the design and operability of the operation section. The switch is adopted. Therefore, in order to control combustion on/off using a push-on switch, for example, the control signal from the control circuit is inverted every time the switch is turned on, so that combustion is alternately turned on and off.

However, in the case where control is performed by reversing the control circuit, if the state of the control circuit is uncertain when the power is restored or when the power plug is inserted into the outlet, for example, when the plug is inserted into the outlet during construction, This creates the inconvenience that the device operates at the end.

The present invention is intended to solve these conventional problems, and will be specifically explained below based on an embodiment shown in the drawings.

Reference numerals 1 and 2 are a push-on type operation switch and a capacity changeover switch, respectively. 3 is the power terminal, 4, 5
is an output terminal to the load control circuit 6, a signal indicating whether the capacity is large or small is supplied from the terminal 4, and power is supplied from the terminal 5. Reference numeral 7 denotes a Zener diode, which constantizes the voltage supplied to a control circuit, which will be described later. Reference numerals 8 and 9 designate inverting circuits provided in the control circuit A, each of which is composed of a T-type flip-flop. The inverting circuits 8 and 9 are both set to return to the initial state when a high value signal is input to the reset terminal CL. The input terminal CP of the inverting circuit 8 is connected to the midpoint between the resistor 10 and the operating switch 1 via the Schmitt circuit 11, and its output terminal Q is connected to the base of the transistor 13 provided in the middle of the circuit leading to the output terminal 5 and the inverter 12. , so that the transistor 13 is cut off in the initial state. In addition, the input terminal CP of the inverting circuit 9 is connected to the midpoint between the resistor 14 and the capacity changeover switch 2 via an inverter 15, and the output terminal is connected to the output terminal 4 via an inverter 16. A low-value signal with low capacity is output from the output terminal. 1
Reference numeral 7 denotes a lamp indicating low capacity, and 18 a lamp indicating high capacity. The lamp 18 is connected to the output side of the inverter 16 via an inverter 19 and a diode 20. 21 is a timer consisting of a resistor 22 and a capacitor 23, and the midpoint between the resistor 22 and the capacitor 23 is connected via a Schmitt circuit 24 to the reset terminal CL of the switch sections 8 and 9 by a circuit 25;
Above timer 21, Schmitt circuit 24, circuit 25
The inverting circuits 9 and 8 constitute a regulating means.

In the above configuration, when the operation switch 1 is turned on, a high value signal is input to the input terminal CP of the inverting circuit 8, and the output of the output terminal Q is inverted. Therefore, each time the operation switch 1 is turned on, the transistor 13 is turned on and off. The state is controlled alternately, and combustion is controlled to turn on and off. When the capacity changeover switch 2 is also turned on, the output of the inverter 9 is inverted, and the output of the inverter 16 is also inverted, so every time the switch 2 is turned on, the output of the inverter 16 is alternately inverted to a high value and a low value, and the output Signals indicating high and low capacity are output alternately from the terminal 4 to control the level of capacity.

Next, a description will be given of when the main power source is turned on, such as when recovering from a power failure. When the original power is supplied from input terminal 3, resistor 2
2, the capacitor 23 is energized. Therefore, at the beginning when the main power is supplied, that is, timer 21
During the set time, the midpoint potential between the resistor 22 and the capacitor 23 is low, and a high value signal is input to the reset terminal CL of each of the inverting circuits 8 and 9 by the circuit 25, and each inverting circuit returns to its initial state. It will be reset. In the initial state, the output terminal Q of the inverting circuit 8
Since the output of the inverting circuit 9 is set to a low value and the output of the output terminal of the inverting circuit 9 is set to a high value, therefore, when the main power is turned on, combustion is in the off state and the capacity is regulated to the small side.

Therefore, for example, there will be no sudden combustion as soon as the main power is turned on during construction, and there will be no sudden combustion when the operation switch 1 is turned on.
There is no longer any sudden gushing of boiling water as soon as you put it in.

As explained above, according to the present invention, a water heater, etc. can be used extremely safely without impairing the operability of the water heater, etc., and is an extremely highly effective device in practical use.

[Brief explanation of the drawing]

The drawing is an electrical circuit diagram showing an embodiment of the present invention. 1... Operation switch, 2... Capacity selection switch, A... Control circuit.

Claims (1)

[Scope of utility model registration request] Equipped with a non-lock type operation switch that operates combustion on/off, a non-lock type capacity changeover switch that operates the capacity level, and a control circuit that inverts and outputs a predetermined control signal based on the operation signal of each switch. A combustion control device characterized in that the combustion control device is provided with means for regulating the combustion to an off state and the capacity to a small side when the main power source is turned on.