Valve device for exhaust duct

Abstract

The invention relates to a valve device for an exhaust duct. The valve device comprises a first check valve body (1) and a second check valve sheet (2), wherein the second check valve sheet (2) is arranged on the first check valve body (1) through a hinging shaft (3) and a channel in a check valve is closed upwards; the hinging shaft (3) is located at the lower part of the first check valve body (1) and a counter weight body (4) is arranged on the check valve sheet below the hinging shaft (3); and the weight of the counter weight body (4) is matched with the weight of the second check valve sheet (2). The valve device for the exhaust duct, provided by the invention, has the characteristics of reasonable structure, capability of preventing the check valve sheet from being stuck, and convenience for detaching, cleaning and maintaining and the like; the work state and the structure form of the check valve sheet are completely changed so that the check valve sheet and the check valve body are not stuck with each other; and therefore, the valve device for the exhaust duct is applicable to the exhaust ducts of all buildings and houses.

Description

Technical field: [0001] The invention relates to a check valve used in the exhaust ducts of buildings and houses, in particular to a special check valve used in the exhaust ducts of range hoods in the buildings and houses. Background technique: [0002] At present, the check valve used in the exhaust ducts of buildings and houses is generally composed of a check valve body and a check valve plate (wind deflector). On the upper part of the check valve body, the check valve sheet hangs down naturally by its own gravity, and closes the exhaust duct downward. When the air is forced out through the exhaust duct, the check valve sheet opens, and when the exhaust is stopped, the check valve sheet is closed. It is closed by its own gravity, because the various oil fume and dirt discharged from the exhaust duct are very viscous and flow downward, it is easy to cause the lower part of the check valve sheet to stick to the check valve body, and the reverse check valve body cannot be op...

AI Technical Summary

Problems solved by technology

[0002] At present, the check valves used in the exhaust ducts of buildings and houses are generally composed of a check valve body and a check valve plate (wind deflector). On the upper part of the check valve body, the check valve plate hangs down naturally by its own gravity, and closes the exhaust duct downward. It is closed by its own gravity. Since all kinds of oil fume and dirt discharged from the exhaust duct are very viscous and flow downward, it is easy to make the lower part of the check valve plate stick to the check valve body, and the check valve cannot be opened when exhaust air is required. The check valve piece and the check valve cannot work normally, and cannot discharge oil fumes and dirt; in addition, the connection between the check valve body and the exhaust duct is unreasonable, and the disassembly, cleaning and maintenance of the check valve are very inconvenient

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