Air volume self-adaptive gas water heater control system

Abstract

The invention discloses an air volume self-adaptive gas water heater control system which is characterized by comprising a main controller and an air pressure sensor connected with the main controller. By means of the main controller, all thermal loads of a gas water heater can correspond to output frequency of the air pressure sensor in a one-to-one mode; when the gas water heater is in a certain thermal load state, the main controller can change fan current to enable the output frequency of the air pressure sensor to be kept at a corresponding value all the time. According to the air volume self-adaptive gas water heater control system disclosed by the invention, a rotation speed of a fan is controlled according to frequency signals, the burning insufficiency phenomenon caused by factors of smoke exhaust block, altitude difference and the like is completely avoided, and adaptation, safety and high efficientibility of the gas water heater are wholly improved; when a low-cost motor is replaced in later, whether property and technical parameters of a replaced motor are completely identical with those of the low-cost motor need not be taken into consideration, and great convenience is brought to engineering design and after sale.

Description

technical field [0001] The invention relates to the technical field of gas water heater control, in particular to a gas water heater control system with self-adaptive air volume. Background technique [0002] At present, when the smoke exhaust pipe of a gas water heater is blocked or the external wind speed is high to generate backflow, the content of harmful gases such as CO will inevitably increase before the water heater is automatically shut down due to the obstruction of the smoke exhaust. Although the harmful gas does not exceed the standard, the health of consumers will definitely be greatly affected if they live in this environment for a long time. Generally, the gas water heater adopts a mechanical wind pressure switch for wind pressure protection, and controls the opening or closing of the micro switch according to the pressure difference between the positive and negative pressure chambers of the wind pressure switch, thereby controlling the opening and closing of ...

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Problems solved by technology

[0003] The application of electronic air pressure sensor in gas water heater is a new technology. Although there are occasional patent mentions, the overall structure is introduced in a large space, and there are few introductions on how to realize it. In addition, special research on fans is required. The relationship between the negative pressure of the sampling nozzle and the external headwind resistance. At the same time, it is necessary to adjust the fan speed in real time in combination with the combustion conditions and the composition of the flue gas. Other gas sensors are also required, which makes this control method relatively complicated and not very feasible.

[0004] In addition, altitude has a great influence on the combustion status of gas water heaters. The same water heater can be used in low altitude areas without any problem, but in high altitude areas, it always encounters abnormal wind pressure and other phenomena. Research, and finally proved that fan control methods such as constant power, constant voltage, and even constant current cannot overcome the deterioration of combustion conditions caused by altitude, and a special mathematical model is needed to adjust the fan speed to solve this problem

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