Air exhausting pipe check valve with natural ventilating and speed variable function

Abstract

A check valve of exhaust channel with the functions of natural ventilation and speed variation is composed of a jointer for joining the exhaust port of exhaust channel with the flexible pipe of oil soot exhaustor, a valve body in said jointer with an airflow channel having big inlet and small outlet for changing speed, and a flexible valve sheet which is naturally suspended at the air outlet of valve body for covering it.

Description

Technical field: [0001] The invention relates to an exhaust duct check valve which is matched with the exhaust duct to prevent backflow of the air flow in the exhaust duct and has the functions of natural ventilation and speed change. Background technique: [0002] Exhaust duct check valves currently in use are mostly made of steel plates, aluminum plates or engineering plastic plates to prevent the backflow of airflow in the exhaust ducts. What they have in common is rigid bodies. The disadvantage is that when the valve discs adhere After being greasy, it is easy to cause the valve plate and the valve body to be closed tightly; at the same time, the rotating shaft that fixes the valve plate, whether it is set at the upper end or lower end or the middle part of the valve plate, whether it is a horizontal rotating shaft or a vertical rotating shaft, The structural assembly between it and the shaft sleeve and the valve body is also difficult to leave no gap between the valve p...

AI Technical Summary

Problems solved by technology

[0002] Exhaust duct check valves currently in use are mostly made of steel plates, aluminum plates or engineering plastic plates to prevent the backflow of airflow in the exhaust ducts. What they have in common is rigid bodies. The disadvantage is that when the valve discs adhere After being greasy, it is easy to cause the valve plate and the valve body to be closed tightly; at the same time, the rotating shaft that fixes the valve plate, whether it is set at the upper end or lower end or the middle part of the valve plate, whether it is a horizontal rotating shaft or a vertical rotating shaft, The structural assembly between it and the shaft sleeve and the valve body is also difficult to leave no gap between the valve plate and the valve body; so it is difficult for the valve plate and the valve body to be completely closed, and the air flow in the exhaust duct is easy to flow from the valve plate to the valve body. The gap between the valve body escapes to prevent the poor effect of backflow

Therefore, even though the kitchen exhaust ducts of many residential buildings are equipped with check valves, although they are fashionable at the beginning of use, after a period of use, backflow occurs.

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