Control method of fuel gas of fuel gas water heater
A technology of gas water heater and control method, which is applied in the direction of fluid heater, lighting and heating equipment, etc., and can solve problems such as dry burning and water tank water heater damage
Active Publication Date: 2014-03-26
HAIER GRP CORP +1
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Problems solved by technology
In the actual operation process, after the user turns off the water, the water flow sensor will not stop running immediately due to the effect of inertia, and will still send out pulse signals, but the number of pulses decreases with the weakening of inertia. Experiments have proved that 8L The water flow can usually exceed 200 milliseconds from the time when the water flow is turned off to when the sensor sends a signal that the pulse is lower than 2.5L. Cause dry burning, causing great damage to the water tank and the entire water heater
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Embodiment Construction
[0032] The invention provides a gas control method of a gas water heater, which can detect whether a user turns off the water in a shorter time, and then closes the gas valve.
[0033] Wherein the gas water heater at least includes a water flow sensor, a central processing unit, and a gas valve. Wherein, the water flow sensor is arranged in the pipeline of the water inlet pipe of the gas water heater, and its signal output end is connected with the central processing unit; the output end of the central processing unit is connected with the gas valve. The water flow rate is detected by the water flow sensor, and the opening and closing of the gas valve is controlled by the central processing unit according to the water flow rate. The details are as follows:
[0034] The water flow sensor consists of a copper valve body, a rotor assembly, a steady flow assembly and a Hall element. It is installed at the water inlet end of the water heater and is used to measure the water flow ...
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The invention provides a control method of fuel gas of a fuel gas water heater. The control method is characterized by comprising the steps of: sequentially obtaining continuous first, second and third pulse signals reported by detecting water flow by a water flow sensor; sequentially computing a first spacing interval Tn-1 of the second pulse signal and the first pulse signal, and a second spacing interval Tn of the third pulse signal and the second pulse signal; and computing a difference delta T of the first and the second spacing intervals, and judging whether the difference delta T is more than the third set time t'3, and controlling the fuel gas to be closed. By using the invention, water supply failure can be more rapidly judged to control the switching off of the fuel gas.
Description
technical field [0001] The invention relates to the technical field of gas water heater control, in particular to a gas water heater gas control method. Background technique [0002] Nowadays, most gas water heaters use Hall-type water flow sensors to sense the size of the water flow. The water flow sensors use the Hall effect of the Hall element to measure magnetic physical quantities. A load resistor is connected in series to the positive pole of the Hall element, and a DC voltage of 5V is applied at the same time so that the direction of the current is perpendicular to the direction of the magnetic field. When the water flows through the turbine switch housing to push the magnetic rotor to rotate, a rotating magnetic field between different magnetic poles is generated, which cuts the magnetic induction line and generates high and low pulse levels. The output pulse signal frequency of the Hall element is proportional to the rotational speed of the magnetic rotor, and the ...
Claims
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IPC IPC(8): F24H9/20
Inventor 全永兵付成先吴恩豪范纪青陈艳丽
Owner HAIER GRP CORP