JPH0212531Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to a gas combustion device with a safety device used for home or business use.

(Prior art) A reverse bias thermocouple connected with the opposite polarity to the main thermocouple inserted into the pilot burner is installed with its hot junction facing the opening of the combustion chamber to prevent oxygen deficiency or fin clogging. Conventionally, in gas combustion equipment equipped with a safety device, the reverse bias thermocouple detects the incomplete combustion caused by The reverse bias thermocouple is simply installed with its hot junction facing the combustion chamber, so when there is wind, the combustion exhaust gas is disturbed in the left and right directions, and the exhaust gas hits the reverse bias thermocouple, causing the reverse bias. There was a drawback that the electromotive force suddenly increased because the thermocouple was heated, and the gas supply could be unexpectedly stopped.

(Purpose of the invention) This invention provides a gas combustion device with a safety device that eliminates the above-mentioned conventional drawbacks by preventing the electromotive force of the reverse bias thermocouple from increasing even in windy conditions.

(Structure of the device) The structure is such that a rectifier plate 2 is installed in a substantially vertical direction below a reverse bias thermocouple TC installed with its hot junction facing the opening 3 of the combustion chamber, and the secondary air flow is This is a gas combustion device with a safety device characterized in that the flow is guided by a rectifying plate 2 and directed toward a reverse bias thermocouple TC.

(Example) Hereinafter, an example in which this invention is applied to a gas water heater with a safety device will be explained in detail based on the drawings. It's summery. TC is a reverse bias thermocouple installed in the inner shell 1, and its hot junction HJ passes through an opening 3 made in one side wall of the inner shell 1 and projects slightly into the inner shell 1. Reference numeral 2 denotes a rectifier plate provided directly below the reverse bias thermocouple TC, and the rectifier plate 2 is located at the lower part of the inner shell 1 in front of the main burner 7, that is, in the secondary air passage from the outer shell 11 to the main burner 7. It is installed in a vertical direction up to TC, and is designed to guide the secondary air flow toward the reverse bias thermocouple TC. 4 is reverse bias thermocouple TC
5 is a lead wire, 6 is a mounting plate, 8 is a heat exchanger, 9 is a water supply coil, and 10 is a gas nozzle.

In the above configuration, when the main burner 7 burns, its draft force causes the reverse bias thermocouple TC to
The rectifying plate 2 installed in the secondary air passage directly under the TC causes the secondary air flow to flow toward the reverse bias thermocouple TC, so even when there is wind, the secondary air flowing in from the air supply holes on the left and right sides of the combustion chamber is The current flows vertically upward along the rectifier plate 2 (see arrow a in the drawing), and the reverse bias thermocouple TC is cooled by this flow, so the increase in electromotive force due to combustion exhaust gas is small. The combustion exhaust gas is disturbed from side to side, front to back, and rises.
This prevents the drawback that the hot junction HJ of the thermocouple TC contacts the hot junction HJ and suddenly heats up, causing a sudden increase in reverse bias voltage.

(Effects of the device) As explained above, this device has a simple structure in which a rectifying plate is installed approximately vertically below the reverse bias thermocouple. Since it is prevented from being heated by exhaust gas, it is practical because the gas supply will not be stopped unexpectedly.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway front view showing an embodiment of this invention, FIG. 2 is a partially cutaway side view, and FIG. 3 is a partially enlarged sectional view. 1... Inner shell, TC... Reverse bias thermocouple, 2
... Rectifying plate, 3... Opening.

Claims (1)

[Scope of utility model registration request] A rectifier plate 2 is installed approximately vertically below the reverse bias thermocouple TC installed near the opening 3 in the side wall of the combustion chamber, and the secondary air flow is guided by the rectifier plate 2. A gas combustion device with a safety device characterized in that the flow is made to flow approximately vertically upward toward a reverse bias thermocouple TC.