JPS60211225A - Safe combustion device of gas burner - Google Patents

Abstract

PURPOSE:To prevent a discharging of unburnt gas in advance by a method wherein an incoming water temperature sensor is arranged at an incoming water part of a water feeding and heating pipe and a hot water temperature sensor is arranged at a hot water output part and fuel gas to be supplied to a main burner is controlled in response to these outputs. CONSTITUTION:A control unit 12 has as an input the temperature signals sensed by an incoming water temperature sensor 10 and a hot water temperature sensor 11 and a supplying quantity of gas in a control solenoid valve 5 is controlled in such a manner as the hot water temperature becomes constant. In turn, in case that a main burner 1 is not ignited or in case that only a part of the main burner 1 is ignited and a regular combustion is not performed, since the hot water temperature is the same as the incoming water temperature or becomes substantially equal to the incoming water temperature, so when the control unit 12 senses this condition, the main burner 4 is closed to terminate the supplying of gas. With this arrangement, it is possible to prevent a danger in advance that the unburnt gas is discharged.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] The present invention relates to a safe combustion device for a gas combustor in a water heater such as an instantaneous gas water heater or a heating water heater. In conventional gas combustors of this type, after detecting that the pilot burner has been ignited, the solenoid valve that supplies gas to the main burner is opened. There were cases where the solenoid valve opened and unburned gas was released. An object of the present invention is to provide a gas combustor for a water heater that is equipped with a safe combustion device that does not cause such a dangerous situation.

[Structure of the Invention] The safe combustion device for a gas combustor in a water heater of the present invention includes a main burner and a water supply heating pipe heated by the main burner.
An inlet water temperature detector is provided on the inlet side of the feed water heating pipe, and an outlet temperature detector is provided on the outlet side of the feed water heating pipe, and a controller that inputs the outputs of these two temperature detectors controls the supply of fuel gas to the main burner and The feature is that the stop is controlled.

Embodiments of the present invention will be described with reference to the drawings. 1 is a main burner, 2 is a pilot burner, 8 is a gas supply pipe, 4 is a main solenoid valve, 5 is a solenoid valve for combustion control, 6 is an igniter, and 7 is a flame detector. Reference numeral 8 denotes a heat exchanger, which is equipped with a water heating pipe 9 that enters water from the direction of arrow a and discharges hot water in the direction of arrow A. An inlet water temperature detector lO for detecting the temperature of the incoming water is installed on the water side of this feed water heating pipe 00Å, and an outlet water temperature detector 11 for detecting the temperature of the outlet water is installed on the outlet side.
z is a controller that inputs the outputs of the flame detector 7, the inlet water temperature detector IO, and the outlet water temperature detector 11 to control the combustion of the burner. 18 is a power supply, and 14 is a power switch.

Next, its effect will be explained. When the power switch 14 is turned on, the controller 12 operates to open the main solenoid valve 4, gas flows into the pilot burner 2, and at the same time, the igniter 6 discharges under the action of the controller 120 to ignite the pilot burner 2. When the flame detector 7 detects the flame of the pilot burner 2, the controller 12 uses the control solenoid valve 5 to supply gas to the main burner 1, and the main burner 1 is ignited. Controller 1
2 inputs the temperature signals detected by the inlet water temperature detector lO and the outlet water temperature detector 11, and controls the gas supply amount of the control solenoid valve 5 so that the outlet temperature is constant.

By the way, if the pilot flame is short due to a blockage in the nozzle of pilot burner 2 or a drop in gas pressure, the main burner may not be ignited, or due to other reasons, only a part of the main burner may ignite and the normal condition may occur. Combustion may not occur.

In this case, the ratio temperature becomes the same value or close to the same value as the inlet water temperature, so when the controller 12 detects this, the main burner 4
Close the gas supply to stop the gas supply.

[Effects of the Invention] As described above, the safe combustion device of the present invention stops the gas supply when the main burner is not burning normally even though gas is being supplied to the main burner. It has an excellent effect of preventing the danger of raw gas being released.

[Brief explanation of drawings]

The figure is a diagram showing the configuration of an embodiment of a safe combustion device for a gas combustor in a water heater of the present invention.

Claims (1)

[Claims] (1) In a water heater that is different from a main burner and a water supply heating pipe heated by the main burner, an inlet water temperature detector is provided on the inlet side of the water supply heating pipe, and an outlet water temperature detector is provided on the hot water outlet side, and these two A safe combustion device for a gas combustor in a water heater (2), characterized in that the controller inputs the output of a temperature detector controls the supply and stop of fuel gas supplied to the main burner. The present invention further comprises a program for stopping the supply of gas to the main panner when the detection output of the inlet water temperature detector and the detection output of the outlet water temperature detector are the same or similar. Safe combustion device for gas combustor in water heater of range (1)