Durable anti-smell-returning range hood check valve

Abstract

The invention aims to provides a durable anti-smell-returning range hood check valve. The durable anti-smell-returning range hood check valve comprises a valve body and a valve plate; a lampblack inlet is arranged in front of the valve body; a bent pipe is connected behind the valve body; the valve plate is mounted in the valve body through a valve shaft; and a moment center change device is mounted on the leeside of the valve plate. The moment center change device is adopted to improve mechanical performances of the valve plate to meet resistance suffered by the valve plate after attachment of oil stains. The device can automatically change the mechanical performances according to an opening angle of the valve plate to meet different requirements of startup and stop of a range hood and opening and closing of the valve plate. The durable anti-smell-returning range hood check valve is simple in structure and high in adaptability. Each improvement for the mechanical performances of the range hood check valve at present is only to increase a counterweight of the valve plate, although the normal automatic closing of the valve plate can be guaranteed after attachment of the oil stains, meanwhile, the valve plate opening resistance is generated, so that the valve plate is possibly not opened after startup of the range hood, and lampblack is stopped to flow back to a kitchen.

Description

technical field [0001] The invention relates to a range hood, in particular to a range hood check valve. Background technique [0002] The check valve of household range hood is an eccentric valve structure, and its valve shaft deviates from the center of gravity of the valve plate. When the range hood is closed, the valve plate will fall under the action of gravity to close the valve body. However, after a long period of use, oil will adhere to the valve plate, valve shaft, and valve body, hindering the rotation of the valve plate, and the possible consequences are: [0003] 1. When the range hood is working, the check valve cannot be opened in time, and the exhaust is not smooth. [0004] 2. After the range hood is turned off, the valve plate cannot fall back under its own gravity, and the oil fume in the public flue will flow back into the kitchen. [0005] Both of the above situations will cause aftertaste. Therefore, the range hood check valve needs to be disassembl...

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to provide a durable anti-return valve for range hoods that solves the problem of back-odor caused by the valve body not being able to seal after the valve plate does not rotate smoothly after oil stains are attached.

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