A flue smoke exhaust system and its control method

Abstract

A smoke exhaust system for a flue, including a public flue, a range hood, a smoke pipe and a fire damper. The air outlet of the range hood is connected to the public flue through the smoke pipe and the fire damper. The fire damper includes The valve body on the valve body and the valve piece installed on the valve body also include an electromagnetic chuck and a power detection socket. The electromagnetic chuck is used to hold the valve piece at the maximum opening angle. The socket supplies power to the electromagnetic chuck, and the plug of the range hood is inserted into the power detection socket so that the power detection socket detects the power of the range hood. The flue smoke exhaust system sucks the valve plate through the electromagnetic sucker, so that the valve plate is not easy to be disturbed by the air flow and swings. The power of the socket range hood is detected through the power, and the output current of the electromagnetic sucker is compensated by feedback, and then the electromagnetic force is adjusted to compensate. Insufficient wind pressure caused by sudden changes in air volume caused by range hood gear changes, so that the wind pressure and magnetic force can balance the gravity of the valve plate.

Description

technical field [0001] The invention relates to a smoke exhaust system, in particular to a flue smoke exhaust system and a control method thereof. Background technique [0002] In kitchens that use longitudinal public flue gas ducts, in order to prevent oily fumes in the flue gas ducts from flowing back into the kitchen, a fire damper is provided between the outlet pipe of the range hood and the public flue gas duct. Existing fire dampers generally include an oil fume passage formed by a casing. The oil fume passage has opposite air inlets and air outlets. The air inlet is connected to the outlet pipe of the range hood. A valve plate that can be opened and closed is arranged at the air outlet of the channel, and the valve plate is installed on the inner wall of the oil fume channel through the rotation of the horizontally arranged valve plate rotating shaft. When the range hood is not in use, the valve is in the closed position due to its own gravity, and the valve is cover...

AI Technical Summary

Problems solved by technology

[0003] There are many range hoods that are turned on at the same time for high-rise public flues, which is likely to cause flow fluctuations. Generally, the valve plate of the fire damper opens with the air flow when the user is turned on, and has a longer life than the electric valve body and is more durable. However, the valve plate of this fire damper Because it is opened by the airflow, it can only be maintained at a relatively large opening angle, and the slight fluctuation of the airflow can easily cause the angle of the valve plate to change

In addition, in the case of high flue back pressure, the valve plate may not open properly, which seriously affects the opening of the valve plate, thereby reducing the smoke exhaust capacity of the range hood

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