Fireproof check valve of automatic falling valve plate

Abstract

The invention discloses a fireproof check valve of an automatic falling valve plate. The fireproof check valve comprises a check valve base (1), the upper portion of the check valve base (1) is provided with a check valve base panel (13) parallel with the pipe wall of a smoke exhaust pipe, the rear portion of the check valve base (1) is provided with a short flow guide pipe (2), and a guide shaft (3) is arranged in the short flow guide pipe (2). The fireproof check valve is characterized in that the guide shaft (3) is close to the front end of an air inlet of the check valve base and is arranged obliquely to a lower position, the guide shaft (3) is sleeved with a valve block (4) capable of moving up and down and automatically falling, and the included angle alpha of the guide shaft (3) and the check valve base panel (13) ranges from 30 degrees to 85 degrees. The fireproof check valve is simple and practical in structure, sealing of the valve can be achieved by means of gravity of the valve block so as to achieve the effects that the valve block can automatically fall and be closed after a guide shaft spring on the rear portion of an existing fireproof check valve fails and to maintain fireproof and smoke-proof flow returning of the valve block, and the service life of the product is improved.

Description

technical field [0001] The invention relates to a fireproof check valve for exhausting oil and smoke. Background technique [0002] At present, exhaust devices such as range hoods need to install a check valve at the connection between the smoke outlet and the flue, which can effectively prevent the toxic waste gas and oil fume discharged from other people's homes in the public flue from entering the user's room. , At the same time, it can also prevent mosquitoes, moths, flies and other flying insects, and reptiles such as geckos from entering, ensuring the hygiene and safety of the air in the user's room. [0003] The Chinese patent application No. 201210081247.1 discloses a fire check valve that can automatically adjust the exhaust air volume, oil and smoke discharge. On the mandrel, the mandrel is fitted with a front spring and a rear spring. The front spring can press the valve disc against the oil fume passage hole of the closed valve body, and realize the function of ...

AI Technical Summary

Problems solved by technology

Because the front springs in the above two kinds of fire check valves are prone to rust in the actual use process, and because the mandrel is set horizontally, when the front springs are rusted and the elastic performance is reduced, It will seriously affect the closing effect of the valve, making the valve not fully closed

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