Domestic gas water heaters have become one of the indispensable household appliances in our life. The extensive use of domestic gas water heaters also makes our lives more convenient and comfortable. So how do you know about the structural principles of domestic natural gas water heaters ? Here we take a look at the relevant knowledge of the structure of domestic natural gas water heaters .
The structure of domestic natural gas water heaters
1 shell
2ã€Exhaust and exhaust device: semi-closed natural exhaust device and closed-type air supply and exhaust device
3 burner: nozzle, ejector, burner head and fire hole
4, heat exchangers (commonly known as water tanks)
5, water control, air control device
6, water and gas linkage device
7, the control system
1 Domestic gas burning appliances Electronic controller types: timing controllers, digital controllers and fuzzy controllers.
2 sensing elements.
3 actuators.
The principle of domestic natural gas water heater
In the case where both the inlet valve and the inlet valve are opened and the power supply is turned on, as long as the hot water valve is opened, the water enters the water heater and flows through the water sensor to the heating water pipe in the heat exchanger.
As water flows through the water sensor, its internal magnetic rotor rotates. The Hall integrated component, located outside the water sensor and next to the rotor, emits electrical pulses to the control circuit (computer).
When the speed of the rotor in the water sensor reaches a specified value, the computer starts the combustion fan. An integrated Hall element is also installed inside the fan. When the speed of the fan reaches a specified value, the gas main valve and the gas proportional valve open, and the gas enters the burner. At the same time, the igniter ignites spark discharge at the ignition pin. The first point was a (a row of) burners, but the flame soon shifted to all the burners and lit all the burners. At this time, the flame detection rod located on the upper part of the burner detects the flame signal and turns on the combustion lamp through the control circuit to keep the combustion.
The water flowing through the heating water pipe in the heat exchanger is heated by the high temperature of the flame, and flows out of the hot water valve. The temperature of the hot water is set by the temperature adjustment knob on the panel, and the actual outlet temperature is measured by the thermistor at the outlet of the heat exchanger. The computer compares the two temperatures and adjusts the gas proportional valve to adjust the gas volume t so that the outlet temperature reaches the set temperature.
In turn, after the hot water valve is closed, the water flow is stopped and the rotor in the water sensor stops rotating, and the pulse signal disappears. The computer informed that the main gas valve and the gas proportional valve were closed and the flame in the burner was extinguished, but the combustion fan stopped after about 70 seconds of continuous operation.
An adjustable water valve is used in the waterway, and the amount of water can be adjusted by the knob on the panel, thereby changing the outlet water temperature. At the same time, a shunt pipe is connected near the heat exchanger, which allows a small portion of cold water to be directly added to the hot water without heating, so as to obtain low-temperature hot water.
A pressure regulator is used in the air circuit to manually adjust the gas pressure and change the size of the firepower. At the same time, 3 switching solenoid valves were also used to obtain hot water of different temperatures.
The above is a brief introduction to the structural principle of domestic natural gas water heaters and I hope to help you. For more information, please visit this website. Stay tuned.
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