JPS6238132Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a combustion device used in a gas instantaneous water heater. FIG. 1 shows a conventional combustion device of this kind, which consists of a member burner A consisting of a plurality of combustion tubes 1 and opposing nozzles 2, and a pilot burner B for ignition provided on the side thereof. , a first opening/closing solenoid valve 4, a second opening/closing solenoid valve 5, a calorific value control solenoid valve 6, and a common gas header 7 for each nozzle 2 provided in the gas passage 3 to the member burner A. is from the passage 3 to the first solenoid valve 4 → second solenoid valve 5 → heat amount control solenoid valve 6
→ Gas header 7 → Those that pass through two solenoid valves 4 and 5 connected in series like each nozzle 2,
The fuel is supplied to the pilot burner B via a branch passage 8 from the first solenoid valve 4.

In the above configuration, when the spark plug 9 starts discharging and the first solenoid valve 4 opens, the pilot burner B is ignited, and after the flame is detected by the flame detection electrode 10, the second solenoid valve 5 and the calorific value control solenoid valve are activated. 6 is activated to ignite the member burner A, and thereafter, the amount of gas to be supplied is controlled by the above-mentioned heat amount control solenoid valve 6, which is controlled by the control device 12 which is activated in response to a predetermined detection signal from the hot water temperature detection element 11. It is becoming more and more common.

In such a conventional configuration, due to the combustion characteristics of the burner, it was actually possible to control only up to 1/4 of the maximum input, and the pilot burner had to be kept on fire at all times. This invention has been devised in view of the above-mentioned conventional one in order to make the heat amount control range as wide as possible, and one embodiment of the combustion apparatus of this invention will be described below.

That is, the same parts in FIG. 2 as those in FIG. 1P and a separate nozzle 2P provided in the gas header 7, and a first solenoid valve 4 and a governor 13 are connected in series to the gas passage 8, and a member member A
A second electromagnetic valve 5 and a calorific value control electromagnetic valve 6 are connected in series to the gas passage 3 leading to the burner, and the member burner A and the pilot burner P are integrally constructed.

In the above configuration, first, the first solenoid valve 4 is opened and the pilot burner P is ignited by the electrode 9.
After the flame detection electrode 10 detects the ignition, the second electromagnetic valve 5 and the heat quantity control electromagnetic valve 6 are operated to ignite the member burner A, and thereafter the electromagnetic valve 6 moves to the heat quantity control operation. In this case, the heat amount control in Member A is performed by a signal (referred to as an input signal) of the difference between the signal from the hot water temperature detection element 11 and the initial set temperature. of maximum input as
Whereas it was possible to control the amount of heat only up to 1/4, in this case, as shown in Figure 3, the pilot burner P is ignited and burned only when the maximum input is required and when the minimum input is required. In other cases, this pilot burner P is turned off, thus widening the range of low input.In summary, the ON/OFF operation of the pilot burner is involved in heat control. It is.

To be more specific, when the input signal is large, member burner A is at maximum input and pilot burner P is also added in the ignited state, and when the input signal becomes small and reaches point a, pilot burner P is turned off. (move to point b). If the hot water temperature still rises, the member A is controlled by the solenoid valve 6 from this point b to reduce its heat input. (Of course, when moving to point b, if the water temperature drops and the input signal increases, the pilot burner is ignited to move to point a.)
Then, the opening degree of the solenoid valve 6 reaches its minimum (c
point), and when the hot water temperature rises, the pilot burner P is ignited and the member burner A is turned off at the same time (point d), so that the heating state is made only by the pilot burner P. (Of course, if the water temperature drops when moving to point d, ignite the member burner and turn off the pilot burner). If the hot water temperature rises further in this state (point e), the pilot burner P is turned off when the hot water temperature reaches the initial set temperature.

Since the combustion device for a gas instant water heater of this invention is configured as described above, not only can the maximum input with good thermal efficiency be obtained by additionally igniting the pilot burner, but also the minimum control input can be reduced to the heat input of only the pilot burner. Since it can be held down, there is no waste, and there is an advantage that the amount of heat can be easily controlled over a wide range.

[Brief description of the drawings]

Fig. 1 is a control circuit diagram showing a conventional combustion device for a gas instantaneous water heater; Fig. 2 is a similar control circuit diagram showing a combustion device for a gas instantaneous water heater according to the present invention;
The figure shows an explanatory diagram of the control operation of the combustion device for a gas instantaneous water heater of this invention. In the figure, A is a member consisting of combustion tube 1 and nozzle 2, and P is combustion tube 1P.
and a pilot burner consisting of a nozzle 2P, 4 is a solenoid valve for opening and closing the gas passage 8, 5 is a solenoid valve for opening and closing the gas passage 3, 6 is a solenoid valve for controlling the amount of heat, 7 is a gas header, 11 is a temperature detection element, 12 is a The control device is shown. In other figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] A member A consisting of a plurality of combustion tubes 1 and their opposing nozzles 2, a combustion tube 1P of the same shape adjacent to the member burner A, and separate nozzles 2P provided in the gas header 7 of each of the nozzles. A pilot burner P is provided, a solenoid valve 4 is provided in the gas passage 8 of the pilot burner P, a solenoid valve 5 and a solenoid valve 6 for controlling the amount of heat are provided in the gas passage 3 for the member burner A, and each burner A,
It operates in response to a signal from the temperature detection element 11 of the hot water heated by P, and when the required input determined by the difference signal between this signal and the initial set temperature is at its maximum, the member A solenoid valve 5 and the pilot operate. Both solenoid valves 4 for burner P are opened, and only the solenoid valve 4 for pilot burner P is opened when the required input is the minimum, and during that time, the solenoid valve 5 for member burner A is opened.
A combustion device for a gas instant water heater, comprising: a control device 12 that opens only the heat amount control solenoid valve 6; and controls the opening degree of the heat amount control solenoid valve 6 in accordance with the required input.