Fireproof check exhaust valve

Abstract

The invention discloses a fireproof non-return exhaust valve which comprises a body, a lock rod is arranged in the body and fixedly connected with a non-return plate, a locking mechanism is further arranged in the body and comprises a base, a locking piece and a fuse, the locking piece is hinged to the base, a torsional spring is arranged between the locking piece and the base, and the fuse is connected with the locking piece. A pull rod connected with the locking piece is arranged on the fuse, the locking piece comprises a locking plate, the locking rod comprises a locking plate and a locking arm, the locking plate is arranged at one end of the locking arm, the other end of the locking arm is fixedly connected with the non-return plate, and the locking piece rotates in a space defined by the locking arm and the locking plate; when the fuse is fused when heated, the pull rod falls off, and the torsional spring resets to drive the locking piece to rotate, so that the outer surface of the locking plate and the inner surface of the locking plate are extruded and attached to each other. Compared with the prior art, the locking piece is in extrusion fit with the outer surface of the locking plate at the end, away from the non-return plate, of the locking rod and the inner surface of the locking plate, and locking of the non-return plate can still be achieved under the condition that spring force loses efficacy due to high temperature.

Description

technical field [0001] The invention relates to a smoke exhaust device, in particular to a fireproof check exhaust valve used in a common exhaust duct of a residence. Background technique [0002] At present, the existing fire check and exhaust valve, such as the Chinese patent number 201710147354.2, the name of the invention is: a fire check valve, which discloses a valve body, a valve plate, a connecting rod, a paddle, a temperature sensing element, A first elastic element and a second elastic element. The valve body is provided with an exhaust port, the valve plate cover is arranged on the exhaust port, the valve plate and the valve body are connected by a connecting rod, the paddle is connected with the valve body in rotation, the temperature sensing element is fixed on the valve body, and one end of the first elastic element is It is fixedly connected with the valve body, and the other end of the first elastic element is connected with the paddle and drives the paddle ...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a fireproof check exhaust valve. The technical problem to be solved is to avoid the phenomenon of backflow caused by the adhesion of oil stains to the point where the check plate cannot be reset under normal conditions, and the failure of the elastic element under high temperature to prevent it from being locked. The non-return plate loses the purpose of blocking the spread of fireworks

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