Highly-closed fireproof check valve

Abstract

The invention discloses a highly-closed fireproof check valve. A valve body, a valve plate, a flow guiding plate and a fusing closing assembly are included. The two sides of the valve body are provided with an air inlet and an air outlet correspondingly. The valve plate covers the position of the air outlet, the lower end of the valve plate and the valve body are rotationally connected through a snap spring assembly, the upper end of the valve plate inclines in the direction close to the valve body, the flow guiding plate is arranged on the side, towards the air outlet, of the valve body, andguiding grooves are formed in two opposite sides of the flow guiding plate. The fusing closing assembly comprises a fusing sheet, a limiting piece, a buckle rod and a spring. Connection of the valve plate and the valve body is changed into lower-end connection, the valve plate can be upwards opened, and the flue ascending airflow flowing direction is better achieved. Through the arrangement of thefusing closing assembly, the valve plate can be automatically closed when the fire disaster happens, and flames and harmful gases are prevented from spreading along a flue. In addition, the valve plate is upwards opened, airflow is not likely to be stopped so that the fusing closing assembly can immediately make contact with high-temperature gas, and the structure is more reasonable.

Description

technical field [0001] The invention relates to the flue check valve technology, in particular to a highly airtight fireproof check valve. Background technique [0002] In kitchens using longitudinal public flue ducts, in order to prevent oily fumes from flowing back into the kitchen, a device such as a flue check valve is installed between the outlet pipe of the range hood and the public flue duct. . Existing flue check valves generally include an oil fume passage formed by a casing, the oil fume passage has opposite air inlets and air outlets, the air inlet is connected to the outlet pipe of the range hood, and the air outlet extends into the public flue gas passage , A valve plate that can be opened and closed is arranged at the air outlet of the oil fume channel, and the valve plate is installed on the inner wall of the oil smoke channel through the rotation of the horizontally arranged valve plate rotating shaft. When the range hood is not in use, the valve plate is i...

AI Technical Summary

Problems solved by technology

However, the connecting pin of this check valve is arranged on the upper end of the valve plate. When the valve plate is opened, it will block the upward airflow of the flue, which is not conducive to the normal smoke exhaust at ordinary times. It will be blocked by the valve, bypassing the fuse, causing the fuse to fail to disconnect immediately, resulting in delays in fire protection

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