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

Abstract

The invention relates to an exhaust duct check valve which is used in conjunction with the exhaust duct to prevent backflow of the air flow in the exhaust duct, and has both the function of natural ventilation and the function of variable speed. The interface connected to the exhaust hose of the range hood is provided with a valve body. The air flow channel in the valve body is a variable speed hole with a large air inlet and a small air outlet. A valve plate made of soft material is arranged at the air outlet of the valve body. The valve plate is naturally drooping and covers the end face of the air outlet of the valve body. It has the advantages of simple structure, low cost, convenient installation and use, good anti-backflow effect, convenient valve replacement and oil cleaning, and has the advantages of natural ventilation function and speed change function. , especially the rectification of the exhaust ducts that are in use and will be backflowed, can effectively prevent backflowing.

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 very thin steel plates, aluminum plates or engineering plastic plates to prevent the backflow of the air flow in the exhaust duct. What they have in common is rigid bodies. After the valve plate and the valve body are adhered to greasy, the valve plate is supported by the partially protruding greasy, resulting in the valve plate and the valve body not being tightly closed; Whether it is a horizontal shaft or a vertical shaft, the structural assembly between it and the sleeve and the valve body is also difficult to ensure that there is no gap between the valve plate and the valve body; therefore, it is difficult for the valve plate and the valve body to ...

AI Technical Summary

Problems solved by technology

[0002] Exhaust duct check valves currently in use are mostly made of very thin steel plates, aluminum plates or engineering plastic plates to prevent the backflow of the air flow in the exhaust duct. What they have in common is rigid bodies. After the valve plate and the valve body are adhered to greasy, the valve plate is supported by the partially protruding greasy, resulting in the valve plate and the valve body not being tightly closed; Whether it is a horizontal shaft or a vertical shaft, the structural assembly between it and the sleeve and the valve body is also difficult to ensure that there is no gap between the valve plate and the valve body; therefore, it is difficult for the valve plate and the valve body to When it is fully closed, the airflow in the exhaust duct can easily escape from the gap between the valve plate and the valve body, preventing backflow is not good

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.

Images