Magnetic check valve

Abstract

The invention relates to a magnetic check valve. The magnetic check valve comprises a connection port, a fixing framework and a rotating plate, wherein driving shafts are horizontally mounted on a left frame and a right frame of the fixing framework; the rotating plate sleeves the driving shafts; permanent magnet sheets are mounted on an upper frame and a lower frame of the fixing framework; rotating covers are symmetrically buckled at two ends of the rotating plate; the rotating covers can slide along the rotating plate freely; the side walls of the rotating covers are made of non-magnetism materials; the bottoms of the rotating covers are made of ferromagnetic materials; the bottoms of the rotating covers are connected to the rotating plate through compression springs; an electromagnet element is mounted in the rotating plate; the magnetic line direction of the electromagnet element extends along the plate surface of the rotating plate; a circuit of the rotating plate protrudes out of axes of the driving shafts and is electrically connected to a circuit of a range hood. The check valve is novel and simple in structure, and is capable of effectively improving the gas tightness of the range hood and preventing the range hood from returning smell and fume.

Description

technical field [0001] The invention relates to a range hood accessory, in particular to a check valve. Background technique [0002] The range hood check valve commonly used in the market is composed of an installation interface, a shell and a flap structure placed in the shell; when the range hood is working, the flap is pushed by the airflow and opens the airflow channel, and the gas is discharged from the flue; After the range hood stops working, the flap closes the flue under the action of gravity, and the gas is blocked. At this time, the gas outside the flue will not flow back; After a while, smoke leakage and off-flavor are easy to occur; the main reason is: the flap adopts a simple mechanical hinge, which is closed by its own weight, the closing force is limited, and the sealing performance is poor; After absorbing the dust in the air, it stagnates on the edge of the flap, causing the edge of the flap to be irregular, and the air tightness will deteriorate after lo...

AI Technical Summary

Problems solved by technology

[0002] The range hood check valve commonly used in the market is composed of an installation interface, a shell and a flap structure placed in the shell; when the range hood is working, the flap is pushed by the airflow and opens the airflow channel, and the gas is discharged from the flue; After the range hood stops working, the flap closes the flue under the action of gravity, and the gas is blocked. At this time, the gas outside the flue will not flow back; After a while, smoke leakage and off-taste are easy to occur; the main reason is: the flap adopts a simple mechanical hinge, which is closed by its own weight, the closing force is limited, and the sealing performance is poor; After absorbing the dust in the air, it stagnates on the edge of the flap, causing the edge of the flap to be irregular, resulting in poor air tightness after long-term use; some products increase the weight of the flap to strengthen the seal, which will increase the size of the flap Resistance to airflow at startup

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