JPS61170848U - - Google Patents

Description

[Brief explanation of the drawing]

1 to 3 relate to a combustion control device for a water heater according to an embodiment of the present invention, FIG. 1 is a block diagram of the combustion control device for a water heater, and FIG. 2 shows water flow, valve drive current, and fan motor rotation. Figure 3 is a time chart of fan motor drive current and rotational speed when the water volume is reduced; Figures 4 to 8 are related to conventional examples;
The figure is a schematic sectional view showing an example of a water heater, Figure 5 is a block diagram of the combustion control device of the water heater, Figure 6 is a characteristic diagram showing the relationship between the drive current of the fuel control valve and the fan motor rotation speed, FIG. 7 is a time chart of water flow rate, valve drive current, fan motor rotation speed, and hot water temperature, and FIG. 8 is a time chart of fan motor drive current and rotation speed when the water flow rate is reduced. In the figure, numeral 1 is a burner, 2 is a fuel supply path, and 5 is a burner.
10 is a fuel control valve, 10 is a fan motor, 18 is a water supply path, 19 is a water amount detection means, 20 is a hot water temperature detection means, 22 is a target temperature setting means, 29 is a valve opening calculation means, and 30 is a phase control means. .

Claims (1)

[Scope of utility model registration request] a fan motor that supplies combustion air to the burner; a fuel control valve installed in the fuel supply path to the burner; a water amount detection device installed in the water supply path; and a target temperature setting device for the outlet temperature. , an opening degree of the fuel control valve based on a deviation between a target temperature signal from the target temperature setting means and an exit hot water temperature signal from the exit temperature detection means and a water amount signal from the water amount detection means; and a valve opening calculation means for calculating the valve opening signal and outputting the valve opening signal to the fuel control valve, and calculating a conduction phase of the drive current of the fan motor based on the valve opening signal from the valve opening calculation means. A combustion control device for a water heater, comprising: phase control means for rectifying a half wave of the motor drive current when a rate of decrease in the value of the valve opening signal is equal to or greater than a predetermined value.